C-DOT SS7 User Manual
Contents
1. TTO4 TT01 A oe A A B B B B 26 14 13 2 X TT08 07 TTO5 a o A J A B B 26 14 13 ri 1 TU TT12 TT10 TT11 TT09 0 D A 5 JA B B B 26 14 13 2 1 TUS TT16 14 TT15 TT13 o A 1 B B B B 26 14 13 2 TU4 BPU A A B 26 2 Y TTO1 TT04 TTO7 TT05 TT08 5 5 A TSU B E B B 9 26 17 2 1 TT TS TT12 TT10 TT15 TTI3 TT16 He 1 TU TSU INTERCONNECTIONS ARE SAME FOR DIFFERENT TU CONFIGURATION 2 SUM CAN BE PLACED IN ANY TU POSITION FIG 8 2 DESIGN CCS7 UM CCS7 TIC C DOT CCS7 SUM PACKAGING amp INTERCONNECTIONS2. TU1 ATU A D B B B B B 26 14 13 2 1 TAO1 TU DTU B B B B 26 14 13 2 1 TAO1 SUM A A A A I B B JB B B 26 14 13 2 1 TA01 TUA ATU A A A UT B B B 26 14 18 A 74 TBO1 TB02 TB03 BPU TB04 a A A 26 73 1 04 TB03 TB02 TBO1 TSU A A A UB a B B B B 26 17 10 1 FIG 8 3 TSU BPU FOR BM L amp TU DTU SUM INTERFRAME CONNECTIONS DESIGN CCS7 UM CCS7 TSU USER S MANUAL 163 941 ZS99 WN ZS99 N9IS3Q NI SI INS SNI SVO 3IAVHA3UH3LLNI NA Dis 314V9 E ZZ LLL ONITEVO 51 NASL NLI NLV JINQOW ASV NIHLIM SNOLLO3NNOOH3 NI lt D 70154 9NIMOTIOH AHL NI NMOHS SV SI AT8IN3SSV HOLO3NNOO 318V9 1913 JHL AT8IN3SSV HOLO3NNOO 318V9 1913 LSIML TIV HOLO3NNOO 11 N LSIML 3HV TIY 3009 al SLI OL SH3d3H 314vV9 HOV3 LSNIVOV 3909 4211371 HNO4 Nda NSL NSO NL ASL NOLLVLN3S3Hd3H d 18VO 31ON C DOT CCS7 51 J e
3. 7 5 CCS7 Maintenance Commands Display Class 7 6 Existing Commands Modified for CCS7 Chapter 8 SUM Pack ging amp Interconnection sisi eee ve oce ees o B SUM PSORHEIHB needed S 2 SUM Interconnections Chapter 9 SUM Retrott Procedure i ERE atio mM t 9 2 SUM Retrofit Proc dure iuro io Praet tend 9 3 Unequipping SUM in a Working Switch 9 4 Utilisation of Unused Time Slots Chapter 10 SUM Iniializabloh s Et HERE EUR cet au mu Q u Qu umat u au nanas 10 2 L vels of eese ab re 10 3 Conditions 10 4 Post Imtyalizaton Checks Chapter 11 11 2 Role of Maintenance Personnel ss ee eere eret entente serere aerea erae erar erar erar artes 11 3 Routine Maintenance iu E t A Ho satire b ERR Chapter 12 Engineering the SUM ete ian i aer tI p ti RA ge 12
4. ooooooo 7 E wns vL peoga J DER niq ani TI Ve poll zou INL vL Chapter 8 164 SUM PACKAGING amp INTERCONNECTIONS 839 8099Wfi 2S09WOIS3QY SNOILOANNOO YAMOd WNS 98 DIH 5911 51999 ONISN LI OL GAIL HONOHL 38 OL GYVOSYSHLOW JHL SSOHOV ONINNNY S3 18V9 H3MOd JHL 8 OL GALOANNOO 38 OL 295 dO GNNOHD TVLIOIG 72 ama 5 113 OL G31O3NNOO OL 084 40 IVLIDIQ 31ON L0 00L dX v IAVIA 14 znsd 10 00083dXV INVIW gila ensd 10 00L8JdXV INVIW pila ynsd 2 L0 0008dX v AVIA S14 14 Insd 084 7 ON 1HVd al bu T ON nsd ONXOgH3LIlJ ONS 318VO il s ES S14 9 14 A B H b nia v s N nso I i 4 Pi E14 B b e f U insa 29799 m _ I gt HOfOHLQV3H H3AO WOH4 lt nsr A8r 165 U
5. ARE gt THE VOICE N lt CIRCUIT NO Y TRY COMPLETE LS DEACTIVATION amp ACTIVATION IF THAT DOES NOT HELP GIVE A SOFT START TO SUM DESIGN CCS7 UM CCS7 CAT 186 C DOT CCS7 ROUTINE MAINTENANCE 11 3 5 CCS Related Do s amp Don ts a b c d e USER S MANUAL Always create atleast two signalling links between any two nodes one each in a different PCM These links work in load sharing mode Do not make all PHC terminals OOS OPR at any given time It is not possible to bring terminals INS from this situation The only possibility is to unequip PHC terminal and equip it again amp proceed Also if only one SHM card is available do not jack it out or make all its terminals OOS OPR Take printouts of CCS7 link report LNK REP and route set report RTSET REP during busy hour and lean hours and during link and route outages These will help in traffic and equipment planning and problem analysis Carefully log OOD alarms and spontaneous fault reports corresponding to SUM entities The reports can come in the following situations a CCS destination node becomes inaccessible accessible b Link Set Bundle becomes faulty or first link comes up c Link thresholds are breached in a linkset d Linkset status changes leading to rerouting e Linkset failure f Do not put force out TUC s of SUM out of service This will lead to initialization
6. SUM INTERCONNECTIONS SUM BM Interconnection SUM can be equipped in any terminal unit frame position of a NON RSU BM in the exchange It can be placed in the principle frame or in concentration with any analogue terminal unit Digital Terminal unit frame The connections of SUM frame to the Time Switch Unit TSU frame are same as that of any analog TU Cable from each copy of TUC of SUM will e connected to each plane of the TSU Similarly if 7SU is in concentration cables from 7SU s TUC will terminate at TIC of principal TU just like any other concentration TU The TU TSU hence SUM TSU TSU BPU and overall BM interframe cabling is shown in Fig 8 2 8 3 amp 8 4 C DOT CCS7 8 3 2 SUM PACKAGING amp INTERCONNECTIONS Note When SU is in concentration with DTU total no of trunks equipped in DTU and PHC terminals in 7SU together should not exceed 126 Power Supply Connections of SUM SUM is given power supply from a set of 4 filter boxes of 4A 2mH rating From the two filter boxes mounted on each copy of bus bar 48 volt supply is given to both the planes Details of PSU connections are shown in Fig 8 5 Fig 8 6 shows the details of the interconnections of error signal cables of filter box and the SUM back plane Motherboard Interconnections Interconnections between the three portions of the split mother board are shown in Fig 8 7 USER S MANUAL 161 Chapter 8 162
7. 43 5 E Sd E E di p adio cos dau is 2 iae t nov 6 4 64 p un o pa M jit W 7 WYS NVS SLIDIQ a _ _ ONIH WVI SLIDIQ SLIDIQ 2 HOOH 110 HagIHOSans 3OVJU3INI 3OVJH3INI 3OVJH3INI H38lHOSHhns ONILVNINH3I dnsi 188 dnsi dnsi SS 9181 H38lHOSANS JONILVNIDIHO g ans 3ONVHOX3 ONILVNINHAL JONVHOXA LISNVHL 35NVHOX3 PNILVNIDIHO v ans QN3931 C DOT CCS7 32 CALL PROCESSING NIFZSOO WN ZSOO WNDISAC SONANOAS 3SVSS3N TIVO dnsSl 113055400 5 ov 911 SNOILIGNOO SANIT 3SVSS3N 5 3NO1 39IOA ON NOILLO3HIGQ GHVMHOV8 NI HONOYHL HLVd 39IOA HOOH NO 914 XI Oe s gt sans 5 Qu Asna ans aaro 4 WYS WYS SLISIG 8 a suoda lt a PS MOOH 44O H3BIHOSANS DOTVNV JOVHHALNI H3alHOSANS JOV4HHALNI dnsl 39V4431NI dnsl JOV4HHALNI dNSI JOV4HHALNI JOV4HALNI H38IH9Sans ansi YAGIHOSENS JONILVNIDIHO
8. TSC ABBREVIATIONS AM ADMINISTRATIVE MODULE AP ADMINISTRATIVE PROCESSOR CONTROLLER BM BASE MODULE BMS BASE MESSAGE SWITCH BP BASE PROCESSOR CM CENTRAL MODULE CMS CENTRAL MESSAGE SWITCH DTU DIGITAL TERMINAL UNIT IOM INPUT OUTPUT MODULE IOP INPUT OUTPUT PROCESSOR SCIC SERVICE CIRCUITS INTERFACE CONTROLLER SSC SPACE SWITCH CONTROLLER SUM SIGNALLING UNIT MODULE TIC TERMINAL INTERFACE CONTROLLER TSC TIME SWITCH CONTROLLER TU TERMINAL UNIT TUC TERMINAL UNIT CONTROLLER CCS7 SIGNALLING UNIT MODULE ARCHITECTURE DESIGN CCS7 UM CCS7 CSU C DOT CCS7 3 2 3 3 SUM ARCHITECTURE HARDWARE ARCHITECTURE FIGURE 3 2 SUM hardware has been implemented by using two basic types of cards a backend duplicated CPU and front end Signalling Handler Module Cards SHM The CPU called 507 cards operate in active standby mode and interface all the SHM cards in n x redundancy and off board memory BME as devices on the processor bus Each SHM card consists of two processing complexes each with two 68302 processors with inbuilt HDLC controller timer shared RAM for buffering messages EPROM for storing code and static RAM for storing data The combination of the microprocessor HDLC controller and shared RAM constitutes a signalling terminal The SHM card provides 8 channels to be used as signalling terminals or I channels and another four channels for diagnostic purposes Outputs of four SHM cards are mul
9. QN3931 33 USER S MANUAL Chapter 4 4 4 34 Ringing Phase In the terminating exchange it is then checked whether the called party is free or busy If the called party is free then ring is fed to the called subscriber Path is switched in the backward chain towards the calling party by sending an Address Complete Message ACM to the preceding exchange After switching the path Ring Back Tone RBT is fed to the calling subscriber The charging information is extracted for the call based on the incoming trunk group category and the call party category and passed to ICUP If in the charging information it is indicated that this exchange has to do the charging ICUP generates the Charge CRG message and sends it to the preceding exchange prior to sending the ACM so that the charging of the call can be done at the originating exchange upon receipt of answer Conversation Phase When the called subscriber answers the call Answer Message ANM is sent to the preceding exchange to notify the called party s condition to the calling subscriber Release Phase If the calling party releases the call ICUP receives Release REL message from the preceding exchange It records the case of failure and replies with Release Complete RLC message to the preceding exchange The call details are then sent to the relevant administration processes for post processing ISUP TRANSIT CALL Setup Phase When a call originate
10. d Echo Suppression Indicator Whether incoming or outgoing echo suppressor is included e Satellite Indicator Whether a satellite hop follows or not f Continuity Check Indicator Whether continuity check on the trunk circuits is required or not 7 TEN includes PCM number to CIC table CIC numbers start from 1 There can more than one such TGPs in a CGS 138 C DOT CCS7 OPERATOR COMMAND SHEETS DISPL TGP PARAMETER ENTRY FORM DISPL TGP DISPLAY TRUNK GROUP CHARACTERISTICS TGP NUM 10 TGP NAME NONE DISPL TGP OUTPUT FORM DISPLAY BOTHWAY TRUNK GROUP REPORT Trunk Group Number Trunk Group Name Line Signalling Scheme Register Signalling Scheme MF SGN TYP Circuit Group Set Number Circuit Group Set Name Pad Level Trunk Group Type Special Facility Signalling Information Echo Suppression Indicator Satellite Indicator Answer Circuit Status Prefix Digits 10 TGP10 DIG CCS CCITT R7 INVALID 1 CGS1 1 ORD NO FCY ISUP CRG CHB ECH SP NROD NO SAT 2WP 548 USER S MANUAL 139 Chapter 7 140 Trunk Priority Dial Tone Trunk Group Category Rank of Digits Min DGT Seize FWD 1 Ring Down Signalling NO Trunk Group Hunt Type PROG Continuity Check Indicator CHK NRQD Answering Circuit Information No of TENs 30 TEN bm rack frame slot pcm ckt 7 1 3 17 1 2 7 1 3 17 1 3 7 1 3 17 1 4 7 1 3 17 1 5 7 1 3 17 32 C DOT CCS7 OPERATOR COMMAND SHEETS
11. 200 SIGNALLING NETWORK DATA CREATION FOR SSP SCP CONNECTIVITY In case of IN application the C DOT DSS acts as an SSP which is connected to SCP Service Control Point via SS7 link and interacts on SCCP TCAP and INAP stack of CCS7 protocol This involves creation of specific data i e Global Title and Subsystem specific data apart from MTP data for links and TGP Depending on the type of connectivity towards SCP from SSP the data creation method charge which is specified in the following sections Data between SSP and SCP when 55 is connected directly to SCP 1 Create CCS7 network data up to link set 2 Create Signalling Route Set CRE SRS In the Sub System Number SSN list give SCMG amp INAP Rest of the parameters are to be filled in the same way as described in the chapter 8 of this document d Create a Self Global Title GT by giving CRE GT command with the following parameters GT Typel ISDN SUBS lt Self Point Code PC Self Point Code SSN INAP 4 Create a Remote GT towards SCP by using CRE GT command with the following parameters GT Typel ISDN SUBS lt Point Code of SCP gt PC lt Point Code of SCP gt SSN INAP RTINGIND DPCSSN Rest of the parameters are to be given default values This completes CCS7 network data creation for SCCP layer The signalling network data created in the above steps is depicted in the diagram on the next page C DOT CCS7 CCS7 DATA CREATION F
12. DEL 1 1 2 17 18 0 OPERATOR COMMAND SHEETS 7 2 14 Modify Linkset Characteristics ADMINISTRATION COMMAND Modify Linkset Characteristics MNEMONIC MOD LS CHAR CLASS MENU POSITION 1 31 14 Update GENERAL INFORMATION COMMAND MNEMONIC FUNCTION PARAMETERS REQUIRED REMARKS Modifv Linkset Characteristics MOD LS CHAR To modify the link thresholds or DPC of an existing linkset LS NUM IMNAC LNI MXAV LN MNAV LN PC LST T1 L2 H2 T3 N4 E4 T5 T6 T7 While modifying care must be taken that MXAV LN should be greater than or equal to MNAV LN For more information on the threshold parameters please refer to Chapter 3 Note These parameters are available 1 5 x x and 2 1 x x releases only USER S MANUAL 85 Chapter 7 MOD LS CHAR PARAMETER ENTRY FORM MOD LS CHAR LS NUM MNAC LN MXAV LN MNAV LN INUM FLAG T1 L2 H2 T3 N4 E4 T5 T6 T7 PC LST I i 0 450 450 800 13 82 5 10 50 15 9998 MODIFY LINK SET CHARACTERISTICS MOD LS CHAR OUTPUT FORM 86 REPORT FOR MOD LS CHAR Link Set Number Link Set Bundle Number Minimum Active Links Maximum Available Links Minimum Available Links FLAG BETWEEN MSUs TIMERS T1 TL2 TH2 TIMERS T3 TN4 TE4 TIMERS T5 T6 T7 PCs Served 0 450 450 800 13 82 5 10 50 15 9998 C DOT CCS7 OPERATOR COMMAND SHEETS 7 2 15 Modify Charge Band Charge Rate Number Association
13. EC OPTN PC LST LOG LNK DAT LNK CREATE A LINK SET 1 0 1 127 0 4095 450 450 800 13 82 5 10 50 15 BASIC 9998 0 amp 1 1 1 2 21 16 1 1 2 21 17 Note These parameters are available 1 5 x x amp 2 1 releases only USER S MANUAL 69 Chapter 7 CRE LS OUTPUT FORM REPORT FOR CRE LS Link Set Number Link Set Bundle Number Maximum Active Links Minimum Active Links Maximum Available Links Minimum Available Links Error Correction Option Max MSU Rtb Max Octet Rtb Flags Between MSUS Timers T1 TL2 TH2 Timers 3 4 4 Timers T5 T6 T7 PCs Served Logical Links Data Links TEN 9 9 1 1 1 1 BASIC 27 4095 0 450 450 800 13 82 5 10 50 15 9998 0 1 1 1 2 21 16 19 915417 C DOT CCS7 OPERATOR COMMAND SHEETS 25 Delete Linkset ADMINISTRATION COMMAND Delete Linkset MNEMONIC DEL LS CLASS MENU POSITION 1 31 7 Update GENERAL INFORMATION COMMAND Delete Linkset MNEMONIC DEL LS FUNCTION To delete an existing linkset PARAMETERS LS NUM REQUIRED REMARKS Upon deletion of an existing LS the data links hitherto assigned to it become free to be used with some other linkset or to be used as voice circuits There should be no signalling route set for the point code served by the LS USER S MANUAL 71 Chapter 7 DEL LS PARAMETER ENTRY FORM DELETE LINK SET DEL LS OUTPUT FORM REPORT FOR DEL LS Link Se
14. TML TYPE PHC TEN bm rack frame slot trml where slot 7 8 9 10 or 17 18 19 20 and trml 1 2 3 4 5 6 7 8 Note Each PHC has 8 terminals in 2 terminal complexes of 4 terminals each Forcing out one or more terminals in a terminal complex forces out all 4 terminals in that complex The terminal complex containing the C 85 terminal s towards the home BM can be forced out only when all other terminal complexes in the frame are OOS OPR Unequip all the SHM cards in the SUM frame Use the command UNEQ TRML CARD with CARD SLT bm rack frame slot where slot 7 8 9 10 17 18 19 20 Force out the TUCs of the SUM frame Use the command FRC SWU OOS with the following parameters MOD NO Home BM number UNIT ID ID of the SUM Unequip 7SU Use the UNEQ FRAME command with the following parameters C DOT CCS7 SUM RETROFIT PROCEDURE MOD NO BMx the home BM RACK NO 1 2 FRAME NO 1 2 3 4 5 6 All the BMs SSC and AP are informed that SUM no longer resides in the exchange All subsequent commands for EQUIP FRAME henceforth are allowed on this frame All the CCS7 related commands henceforth should be rejected until SUM is equipped again 9 4 UTILISATION OF UNUSED TIME SLOTS The SUM can be equipped in any frame position as well as in any concentration position In the home BM if all four TUs are equipped the SUM can be in a separate cabinet in a concentration position with a principal TU Similarly
15. e Switchover of APC BPC SSC SU during patch or code loading Patch Init Switch over during data loading Part Init Data comparison error in read only data ROD area Unrecoverable error ROD area in simplex memory condition Stable Clear Data comparison error in read write data RWD area Unrecoverable error in RWD area in simplex memory condition e Overflow of software recovery counters within certain time e Failure of both time switches message switches or SCICs Soft Start e Any exception when Operating System OS of a static process is running On the other hand Operator can give INIT MOD INIT SYS commands to make the system go for any level of initialization by giving a proper initialization option C DOT CCS7 SUM INITIALIZATION 10 4 POST INITIALIZATION CHECKS As a matter of practice the operator should always make the following checks after every initialization activity spontaneous or otherwise Check the status of all the switch units and alarms Check the status of all the signalling links Check the status of ISUP trunks and PHC terminals Make one or two calls through all the trunk groups Verify that incoming calls are successful Verify that switch unit status and alarms are proper and are identical on both the IOPs Check whether all ADP LEDs are functional use LED Test button on the USER S MANUAL 177 11 1 11 2 11 Routine Ma
16. 7 6 4 Put Terminal Out of Service Put Terminal In Service MAINTENANCE COMMAND Put Terminal Out of Service Put Terminal In Service PUT TRM OOS CLASS MENU POSITION 23 1 2 PUT TRM INS Update GENERAL INFORMATION COMMAND Puta terminal out of service inservice MNEMONIC PUT TRM OOS INS FUNCTION change the status of specified type and number of terminal out of service or inservice PARAMETERS TEN DIRNO REQUIRED REMARKS For a new terminal type will be introduced PHC This command will be used to force PHC terminals out of service inservice Note Never force out all the equipped PHC terminals simultaneously If it is done accidentally then unequip and equip any one of the PHC cards USER S MANUAL 141 Chapter 7 PUT TRM OOS INS PARAMETER ENTRY FORM FRC TRM OOS INS PUT TERMINAL OUTOF SERVICE IN SERVICE TML TYP PHC TEN 14274 1014274 DIRNO NONE PUT TRM OOS OUTPUT FORM PHC STATUS CHANGE REPORT TML TYPE PHC RESULT NEW STATUS OLD STATUS PASS OOS OPR INS FREE PASS OOS OPR INS FREE PASS OOS OPR INS FREE PASS OOS OPR INS FREE 142 C DOT CCS7 OPERATOR COMMAND SHEETS PUT TRM INS OUTPUT FORM TEN RESULT trara 112572 1 1 2 7 8 11274 USER S MANUAL PASS PASS PASS PASS PHC STATUS CHANGE REPORT TML TYP PHC NEW STATUS INS FREE INS FREE INS FREE INS FREE OLD STATUS OOS OPR OOS OPR OOS OPR O
17. DISPLAY SIGNALLING ROUTESET REPORT Signalling Route Set Number 1 Self Point Code 1104 Destination Point Code 9999 Signalling Network NW NAT High Route table route status LOC UNAVAIL LOC UNAVAIL Low Route table route status LOC UNAVAIL LOC UNAVAIL Current route table None High Priority Route table 1 Low Priority Route Table None Sub system Number List SSN BKDPC BKNWID BKSSN SCMG NONE NONE NONE INAP NONE NONE NONE Global Title Associated TYPE1 ISDN SUBS 9998 C DOT CCS7 7 3 2 ADMINISTRATION OPERATOR COMMAND SHEETS lay Signal Point Code Information COMMAND Display Signal Point Code Information MNEMONIC DISPL SPC CLASS MENU POSITION 1 32 2 Display GENERAL INFORMATION COMMAND MNEMONIC FUNCTION PARAMETERS REQUIRED REMARKS USER S MANUAL Display Signal Point Codes for Exchange DISPL SPC To display all the point codes defined for the exchange None Response shows the list of SPCs for each signalling network of which this node is a member There can be maximum number of four PCs in all 99 Chapter 7 DISPL SPC PARAMETER ENTRY FORM DISPL SPC DISPLAY SIGNAL POINT CODE No parameters required DISPL SPC OUTPUT FORM DISPLAY SIGNALLING POINT CODES REPORT Signalling Network Self Point Code NW NAT 1104 NW NAT 9998 100 C DOT CCS7 OPERATOR COMMAND SHEETS 7 3 3 Display Linkset Information ADMINISTRATION COMMAND Display Linkset Informat
18. For this test the destination node should be accessible else the command will show TEN s status as DEST NOT ACC USER S MANUAL 117 Chapter 7 MOD BLK7 STS PARAMETER ENTRY FORM MOD BLK7 STS MODIFY BLOCK 7 STATUS BLK TYP 7 1 1 17 2 to 7 1 1 17 8 MOD BLK7 STS OUTPUT FORM BLOCK OR UNBLOCK NO7 TRUNKS REPORT TRUNK GROUP TEN S STATUS NREQ SENT 7 1 1 17 3 NREQ SENT 7 1 1 17 4 NREQ SENT 7 1 1 17 5 NREQ SENT 7 1 1 17 6 NREQ SENT NREQ SENT 7 1 1 17 8 NREQ SENT 118 C DOT CCS7 OPERATOR COMMAND SHEETS 7 5 CCS7 MAINTENANCE COMMANDS DISPLAY CLASS 7 5 1 Display Linkset Status MAINTENANCE COMMAND Display Linkset Status MNEMONIC DISPL LS STS CLASS MENU POSITION 2 13 1 Display GENERAL INFORMATION COMMAND Display Linkset Status MNEMONIC DISPL LS STS FUNCTION command displays the detailed status of each link forming the linkset PARAMETERS LS NUM REQUIRED REMARKS The links status can be or combination of the following a Activation attempt failed on the link b Link is active and carrying traffic c Link is remotely inhibited d Link is locally inhibited e Link has been deactivated f Linkis active g Link is in the out of service status h Link is remotely blocked Link is locally blocked By default the status of all the linksets is displayed by this command USER S MANUAL 119 Chapter 7 DISPL LS STS P
19. 11 2 1 1 Ensuring Periodic Dump of Desired Information System on its own initiative keeps generating various reports regarding system s health as and when significant events take place Maintenance personnel too can programme the system in advance for generating various periodic reports including the following Such reports are to be scanned daily to enable them to track the system s health on a day to day basis i List of all switch units and terminals having OOS OPR status ii List of all switch units found faulty by the system OOS SYS iii List of all terminals found faulty by the system OOS SE OOS SO iv List of service circuits and trunks found faulty by the system or by the operator v List of CCS7 circuits CICs having status as BLOCKED INS S7BSY or as OOS TRANS Above reports can be generated by storing appropriate commands along with the execution time and interval in the system s calendar 11 2 1 2 Scanning Spontaneously Generated Reports All reports periodic or otherwise should be scanned daily keeping following objectives in view i To identify fresh repair needs ii To verify the repair activity done earlier is successful or not iii To verify that no of lines and CCS7 circuits CICs having Out of Service OOS status is within acceptable limits iv To detect any abnormality in system s behaviour v To verify that no unit or link of the system remains untested or in passive service for a lo
20. Concentration with a ATU After initialization of SUM and setting up of CCS7 and C 85 links according to initial configuration all the remaining time slots can be utilized by the ATUs in concentration mode However if more time slots are required by 7SU later on and if they are not available trunks will have to be deleted through operator commands to make time slots available USER S MANUAL 173 10 1 10 2 174 10 SUM Initialization OVERVIEW Initialization procedures are used to bring up the system from cold level and load the code patches data and initialize the entire system to a level in which calls can be processed During initialization if at any time the system faces a unrecoverable software hardware problems it will try to solve the same by going for higher level recoveries like soft start stable clear partial initialization or code load LEVELS OF INITIALIZATION There are many levels of SUM initialization Each level will involve a subset of the steps c through h Only after completion of step h will the system be ready for service a Code loading b Patch loading c Exchange data base loading d Administration data loading e Call processing data initialization viz creating time slot maps etc f Maintenance data loading g Process initialization in BPC h Initialization of all units C DOT CCS7 SUM INITIALIZATION The different levels of initialization are described
21. Signalling link related problems and their solutions iv Initialization related problems 11 3 1 Fault Maintenance of SUM S No Hardware Switch Unit Alarm type Corrective action Unit Fault 1 507 Both 507 Critical Alarm at Out Of Service On ADP OOS state critical alarm will be raised for SUM 2 SUT One CPU of a Urgent alarm at plane in OOS OOD Urgent In state ADP alarm will be raised for SUM In this situation SUM will be under initialization First check the status of both the TUCs of SUM If they are out of service bring them in service After TUCs come in service code loading will automatically start for SUM If are inservice then see all the pending alarms for SUM from OOD log or DISPL ARM LIST This situation can arise if both the 507 cards have failed simultaneously or both the BME cards memories have failed simultaneously Find this out from the pending alarms for these units from replace these cards one by one After this give a reset to both CPU code loading should start Check if both PSUs in that plane are inservice Check if there is any PSU alarm in the alarms list If PSU is Okay then diagnose 507 If 507 found faulty replace the same and bring it inservice by PUT SWU INS command One memory in Urgent alarm at Check both the PSUs of 182 C DOT CCS7 USER S MANUAL Both memory out of service O
22. amp INTERCONNECTIONS SLOT No 2 94 5 G 7 8 9 1011 12 13 14 15 16 17 18 19 2021 22 23 24 25 26 P 818 8518195 IT ITITIT 8 eie S B 5 MIHHIHIHIU UIU UJU UH U U HIM s s U E MIMIMIM 7 C I lI C 7MI L U U Il mrsea4ms05 715 5591 Il Il 2 3 4 8 7 NOTES 1 PSU 1 amp 2 AND 3 amp 4 SUPPLY POWER IN LOAD SHARING MODE TO THEIR RESPECTIVE PLANES 2 SU7 CARD IS INFACT BPC HPC CARD USED IN OTHER CPU COMPLEXES BUT HAS DIFFERNT FIRMWARE FIG 8 1 SUM CARD FRAME DESIGN CCS7 UM CCS7 CF USER S MANUAL 159 Chapter 8 8 2 8 3 8 3 1 160 SUM FIRMWARE The SUM controller cards SHM 507 and have firmware resident in the and EPLDs The position of these on each card is given in Table 8 2 below For the checksums of the devices please refer to the appropriate software release document Table 8 2 SUM Firmware Card Device Type Device ID Position SHM PROM 120ns LPHC U17 APC SHM473 H S01 PROM 120ns HPHC U5 PROM 120ns LPHC U20 PROM 120ns HPHC U10 EPLD IMP U6 EPLD IMP U9 EPLD SCC U47 EPLD TUC U51 507 PROM HNPC U43 APC BPC441 D S02 PROM LNPC U45 SU7 HPC PROM NPC U55 APC HPC393 0 S01 EPLD EPLD1 U13 EPLD EPLD2 U3 EPLD EPLD3 U52 EPLD EPLD4 U15 EPLD EPLD5 U4 EPLD EPLD6 U14 TUC PROM LTUC U68 APC TUC046 T S03 PROM HTUC U85
23. and between Base Modules and Administrative Module for operation and maintenance functions C DOT CCS7 CCS7 CAPABILITY IN C DOT DSS MDF BM SUBSCRIBER LINES ANALOG TRUNKS DIGITAL TRUNKS BM DIGITAL LINKS CM FROM RSUs ADP DEVICES A N PRINTER DISK LEGEND BASE MODULE CENTRAL MODULE ADMINISTRATIVE MODULE INPUT OUTPUT MODULE ALARM DISPLAY PANEL MAIN DISTRIBUTION FRAME REMOTE SWITCH UNIT 32 FIG 2 1 C DOT DSS MAX BASIC ARCHITECTURE IOM DESIGN CCS7 UM CCS7 SA USER S MANUAL 19 Chapter 2 2 2 20 The duplicated Network Synchronisation Controller NSC in the CM provides clock and synchronisation to processing complexes in the switch It has digital phase locked PLL circuitry for locking to the network reference clock In free run made it supplies its highly accurate level 2 clock to the switch Administrative Module AM performs system level resource allocation and processing function on a centralised basis It performs all the memory and time intensive call processing support functions and also administration and maintenance functions It communicates with the Base Modules via the Central Module It supports the Input Output Module for providing man machine interface It also supports an Alarm Display Panel ADP for the audio visual indication of faults in the system In SBM configu
24. the SUM can be in the principal TU position and a TU frame in concentration position can use the unused time slots It is also possible to concentrate these unused time slots and use them for subscriber lines or trunks The parameters for the commands discussed above will get changed depending on the placement of the SUM The unused time slots can be used by equipping terminal cards using EQUIP TRML CARD command with appropriate TIC IDs Presently the in 7SU utilize up to 32 time slots allotted by BPC With HPC 7SU utilizes 64 time slots for 64 PHC terminals The terminal IDs 8 15 24 31 40 47 56 63 get mapped to the time slots allotted by BP at the time of connection While establishing a 7 or C 85 link it is desirable that a time slot is available whenever a connection is to be made without any contention and re attempt Hence 32 time slots are to be kept reserved for SUM The TU sharing the 128 time slots with the SUM should be equipped such a way that its requirement is restricted to 96 time slots Concentration with a DTU The SUM can be put behind a DTU with the DTU in the primary position With minor changes in DTU backplane it also can be used in concentration position behind SUM Here 3 PCMs can be equipped by which 96 time slots will get nailed up to TUC The remaining 32 with BPC cards with HPC 64 time slots will be used by SUM will be meant for SUM whenever 57 or C 85 link is required to be set up
25. 94 C DOT CCS7 OPERATOR COMMAND SHEETS 7 2 19 Display Global Title Translation ADMINISTRATION COMMAND Display Global Title Translation MNEMONIC CLASS MENU POSITION 1 31 16 Update GENERAL INFORMATION COMMAND Display Global Title Translation MNEMONIC DISPL GT FUNCTION Display the characteristic of a global title PARAMETERS GT REQUIRED REMARKS None USER S MANUAL 95 Chapter 7 GT PARAMETER ENTRY FORM DISPLAY GLOBAL TITLE Type1 ISDN SUBS 9998 OUTPUT FORM GT Sig NW New Add New NAI Rtind 96 DISPLAY GLOBAL TITLE Type 1 ISDN subs 9998 9998 NW NAT None None DPCSSN C DOT CCS7 OPERATOR COMMAND SHEETS 7 3 CCS 7 ADMINISTRATION COMMANDS DISPLAY CLASS 7 3 1 Display Signalling Route Set Information ADMINISTRATION COMMAND Display Signalling Route Set Information MNEMONIC DISPL SRS CLASS MENU POSITION 1 32 1 Display GENERAL INFORMATION COMMAND Display Signalling Route Set Information MNEMONIC DISPL SRS FUNCTION To display signalling information of a route set PARAMETERS SRS NUM REQUIRED REMARKS Before execution of this command the desired route set should have been created through CRE SRS command Note These parameters are available in 1 5 x x release only USER S MANUAL 97 Chapter 7 DISPL SRS PARAMETER ENTRY FORM DISPL SRS DISPLAY SIGNALLING ROUTE SET INFORMATION SRS NUM DISPL SRS OUTPUT FORM 98
26. BLOCK SWITCH BLOCK SIGNALLING CONTROL l CONTROL CHANNEL SIGNALLING DESIGN CCS7 UM CCS7 CC C DOT CCS7 INTRODUCTION One result of the evolutionary process of exchanges described above is to change the relationship between signalling and call control In the early exchange systems exchanges could communicate but in a limited and inflexible manner thus limiting the flexibility of call control In a CCS environment the objective is to allow uninhibited communication between exchange control functions or processors thus tremendously broadening the scope and flexibility of information transfer Further advantages result from the evolutionary process of CCS and call control The drive to provide an unrestricted communication capability between exchange processors eliminates per circuit signalling termination costs These costs are inevitable in per circuit CAS systems but for funelling all signalling information into a single common channel only one signalling termination cost is incurred for each transmission link There are cost penalties for CCS systems e g the messages received by an exchange have to be analysed resulting in a processing overhead However these cost penalties are more than covered by the advantages of increased scope of inter processor communication and more efficient processor activity The separation of CCS from traffic circuits and the direct inter connection of exchange proc
27. CGS NAME 4 ALL CGS DISPL CGS NUM NAME OUTPUT FORM REPORT FOR DISPL CGS NUM NAME Circuit Group Set Number Circuit Group Set Name CGS1 CGS2 108 C DOT CCS7 OPERATOR COMMAND SHEETS 7 3 6 Display Charge Band to Charge Rate Association ADMINISTRATION COMMAND Display Charge Band to Charge Rate Association MNEMONIC DISPL CHB CRG CLASS MENU POSITION 1 41 8 Display GENERAL INFORMATION COMMAND Display Charge Band to Charge Rate MNEMONIC DISPL CHB CRG FUNCTION This command displays the charge Rate Numbers associated with a particular charge Band PARAMETERS CRG BND REQUIRED REMARKS This command can be used to see the association of charge band and charge rate for a single charge Band or for all the charge Band existing in the system USER S MANUAL 109 Chapter 7 DISPL CHB CRG PARAMETER ENTRY FORM DISPL CHB CRG DISPLAY CHARGE BND CHARGE RATE ASSOCIATION CRG BND DISPL CHB CRG OUTPUT FORM DISPL CHB CRG Association CHARGE BAND NUMBER CHARGE RATE NUMBER 5 31 32 110 C DOT CCS7 OPERATOR COMMAND SHEETS 7 4 CCS7 MAINTENANCE COMMANDS UPDATE CLASS 7 4 1 Test Signal Link MAINTENANCE COMMAND Test Signal Link MNEMONIC TST SGNL LNK CLASS MENU POSITION 2 12 1 Update GENERAL INFORMATION COMMAND Test Signal Link MNEMONIC TST SGNL LNK FUNCTION perform tests on a link PARAMETERS LSB NUM LOG LNK REQUIRED REMARKS Before testin
28. DISPL CHB CRG Display Charge Band Charge CRG BND Rate Association 40 C DOT CCS7 6 1 6 2 Chapter 6 Parameters Description INTRODUCTION On issuing a command with valid mnemonic and syntax the system responds by displaying a parameter entry form in which the parameters required for execution of that command are to be specified by the operator Parameters are variables that identify and contain a piece of necessary information to execute a command Although online help is available on the parameter entry form it is very important for the operating personnel to understand the correct application of each parameter Some of the parameters are used in more than one command In the parameter description to follow such parameters are discussed only once alongwith necessary qualifying remarks Parameter description for each parameter is covered under the following subheads PARAMETER NAME Name of the parameter MNEMONIC Address code in the form of a pronounceable word TYPE i ASCII numeric or logical i e type of data acceptable POSSIBLE VALUES A set of values and or range acceptable DEFAULT VALUE The value automatically assigned by the system if the operator does not assign any value i e just presses the lt Return gt key REMARKS Some more information regarding special attributes of the parameter and their usage PARAMETERS DESCRIPTION On the proceeding pages all the parameters used by CCS7 administratio
29. Information MNEMONIC DISPL CGS FUNCTION display the characteristics of one or all circuit group sets in the exchange PARAMETERS CGS NUM CGS NAME REQUIRED REMARKS This command is used to display the characteristics of a particular circuit group set or all circuit group sets defined for the exchange For displaying characteristics of all CGS do not give any parameters The command should be executed with default values of both the parameters It is a very useful command for knowing the relation between the voice and the signalling networks USER S MANUAL 103 Chapter 7 DISPL CGS PARAMETER ENTRY FORM DISPL CGS DISPLAY CIRCUIT GROUP SET CGS NUM CGS NAME DISPL CGS OUTPUT FORM DISPLAY CIRCUIT GROUP SET CHARACTERISTICS Circuit Group Set Number 1 Circuit Group Set Name 1 Self Point Code 9998 Destination Point Code 1104 Signalling Network NW NAT User Part Type ISUP Link Set Bundle Number 1 Trunk Groups of CGS 10 12 50 52 70 72 90 104 C DOT CCS7 OPERATOR COMMAND SHEETS 7 3 4 Display Linkset Bundle Information ADMINISTRATION COMMAND Display Linkset Bundle Information MNEMONIC DISPL LSB CLASS MENU POSITION 1 32 5 Display GENERAL INFORMATION COMMAND Display Linkset MNEMONIC DISPL LSB FUNCTION display the characteristics of a link set bundle PARAMETERS LSB NUM REQUIRED REMARKS Each linkset bundle is associated with a particular circuit gr
30. PART ISUP 3 CRE TGP Create Trunk Group TGP NUM 1 Trunk group number TGP NAME CCS71 Trunk group name TGP STA BW TGP Status Bothway LIN SIG DIG CCS Line Signalling Digital CCS REG SIG CCITT R7 Register Signalling CCITT No 7 CGS NUM 1 CGS number CGS NAME NONE CGS name None i e not specified RNK DGT 4 Rank of digit TGP TYPE ORD TGP type ordinary DGT SZFD 1 minimum Digit Seize Forward USER S MANUAL 195 Annexure I _ 1 LSB 1 LS 1 SRS 1 LINK LSB 2 4 SPC 1000 LINKS LINK1 LINK1 CCS7 SIGNALLING NETWORK VOICE NETWORK TGP 1 OG ia 1 EXCHANGE EXCHANGE CODE 548 CODE 548 SUB A1 5480001 196 SIGNALLING amp VOICE NETWORKS SETUP SUB B1 5480002 DESIGN CCS7 UM CCS7 VNS C DOT CCS7 CCS7 DATA CREATION FOR PSTN ISDN APPLICATION AC STA 2WP Two Wire Protocol SIG INF ISUP CRG CHB ISUP Charging Methods Charge Band 47 TEN BMNO FRAMENO RACKNO SLOTNO PCMNO CKTNO 7 Terminal Equipment Numbers e g if only one PCM is included in the circuit group then 7 TEN numbering will be as follows X X X X 1 2 TO X X X X 1 32 where 1 is the PCM id and X X X X the slot no Depending on the PCM id the voice circuits of the trunk group are given CIC numbers The CIC numbers at the remote and should
31. SUM N x 100 iv Out of the n signalling terminals the actual utilization of will depend on the signalling network connectivity of the node and the amount of signalling traffic to be handled The above discussion is further illustrated by way of example in the following section 12 2 SIGNALLING NETWORK CONNECTIVITY AN EXAMPLE 1 Let us say the C DOT exchange signalling network node is connected to four other nodes A B C amp D via signalling links The CCS7 trunks are spread over four 4 trunk BMs in the switch This is depicted in Fig 12 1 From 1 we have that the requirement of internal message C 85 terminals M No of trunk BMs other than the home BM 2 4 2 6 v Hence from iv we calculate that INT THR x 100 18 75 or 19 and NO7 THR 100 19 81 Note that we are assuming SUM CPU to be BPC and hence maximum 32 PHC terminals The system parameters INT THR and NO7 THR should be set to these values by MOD SYS PARAM command The terminals left for CCS7 signalling will be n N M 32 6 26 These 26 terminals can be used to create upto 26 signalling links Number of signalling links towards a particular destination depends on the volume of traffic and redundancy consideration However it is advisable that for redundancy atleast two 2 signalling links on two different PCM streams should be used Each signalling link can carry a traffic of about 35 000 to 40 000
32. This involves preparing a file of commands needed for periodic testing and specifying in the system s calendar the time of day and the periodicity for executing the command file Once this is done at specified time interval System automatically keeps routining exchange hardware and generates reports In case of manual testing the operator needs to initiate the tests manually as per the schedule drawn 11 2 3 3 Scanning Routining Reports Routining reports convey the test results to maintenance personnel It is essential to scan the said reports daily so as to confirm the following 1 Periodic testing routining schedule is actually being done ii No unit or link remains in passive role for a long period iii No unit or termination remains un tested for a long period iv Routining was not abandoned in between V Units or terminations are generally found in good health after routining Routining failures also result in generation of diagnostic reports alarm reports and appropriate alarms on the OOD In case above is not true further investigations are initiated 11 3 Routine Maintenance of SUM Routine maintenance for the CCS7 Signalling Unit Module is described in the following sections These section contain i Fault maintenance of SUM describing the hardware faults in signalling unit and their corrective actions ii CCS7 circuit related problems and their solutions USER S MANUAL 181 Chapter 11 iii
33. VALUES DEFAULT VALUE REMARKS 48 Maximum Available Links MXAV LN 2 Numeric 1to 16 Range or set not allowed 0 zero It is the maximum number of links available for carrying traffic in a link set C DOT CCS7 PARAMETERS DESCRIPTION 6 2 22 MXMS RB Maximum MSU in Retransmission PARAMETER NAME Maximum MSUs Message Signalling Unit in Retransmission Buffers MNEMONIC MXMS RB TYPE 5 Numeric POSSIBLE VALUES 1 to 65535 Range or set not allowed DEFAULT VALUE 127 REMARKS Defines the maximum of MSUSs to be retained in retransmission buffers If acknowledgement is not received within a specific period or a negative acknowledgement is received appropriate number of MSU are retransmitted from the buffer 6 2 23 NEW ADR New Address PARAMETER NAME New Address digits after GT translation MNEMONIC New ADR TYPE Numeric POSSIBLE VALUES Range 9999 9999 9999 9999 9999 DEFAULT VALUE NONE REMARKS This specifies the new address after GT translation This will be used only if the old GT address is to be converted to a new address 6 2 24 NET ID Network Identification PARAMETER NAME Network Identification MNEMONIC NET ID TYPE 7 ASCII POSSIBLE VALUES 1 NW NAT National network 2 NW INAT International network DEFAULT VALUE NW NAT REMARKS It identifies the national or international network within which the USER S MANUAL connectivity status of the local mode is to be interrogated 49 Chapter 6 6 2 25 NE
34. codes can be increased in a network C DOT CCS7 PARAMETERS DESCRIPTION 6 2 33 SPC LST Self Point Code List PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS Self Point Code List SPC LST 5 Numeric 0 to 214 1 i e 0 to 16383 Set allowed None Essential parameter The list of point codes assigned to an exchange which is node in the CCS signalling network Similar to exchange code in the voice network 6 2 34 SRS NUM Signalling Route Set Number PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS Signalling Route Set Number SRS NUM 2 Numeric 1 to 64 Range or set not allowed None Essential parameter SRS is the set of signalling routes defined between two nodes 6 2 35 SSN LST Subsystem Number List PARAMETER NAME MNEMONIC TYPE DEFAULT VALUES REMARKS USER S MANUAL Subsystem Number List SSN LST ASCII or Numeric NONE 65535 NONE NONE This parameter is used for identifying subsystems It has the following 4 fields Subfield 1 User parts Possible values NONE SCMG SCCP Management INAP Intelligent Network Application part ISUP ISDN user part Subfield 2 Backup DPC Used only when SCP are mated It is used to specify the backup DPC number Subfield 3 Backup DPCs Nature of network Subfield 4 Backup SSN id 53 Chapter 6 6 2 36 STP USER Signalling Transfer Point Users PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFA
35. command be executed when no CGS are associated with the concerned SPC This means that the point code to be deleted should not be in use for a signalling relation 66 C DOT CCS7 OPERATOR COMMAND SHEETS DEL SPC PARAMETER ENTRY FORM DEL SPC DELETE SPC FOR THIS EXCHANGE SIG NW NW NAT SPC LST 1104 DEL SPC OUTPUT FORM DELETE SIGNALLING POINT CODES REPORT Signalling Network NW NAT Self Point Code 1104 USER S MANUAL 67 Chapter 7 7 2 6 Create a Link Set ADMINISTRATION COMMAND Create a Link Set MNEMONIC CRE LS CLASS MENU POSITION 1 316 Update GENERAL INFORMATION COMMAND Create a Link Set MNEMONIC CRE LS FUNCTION This command creates a link set between two exchanges The links in the LS should have the same error correction option i e basic or PCR PARAMETERS LS NUM LSB NUM MNAC LN T1 L2 H2 T3 REQUIRED N4 E4 T5 T6 T7 MXAV LN MNAV LN EC OPTN MXOC RB PC LST LOG LNK DAT LNK NUM FLAG REMARKS The link set bundle LSB of which this LS will be a part should already exist The point code should not be in the PC served list of another LS Note These parameters are available in 1 5 x x amp 2 1 x x releases only 68 C DOT CCS7 OPERATOR COMMAND SHEETS CRE LS PARAMETER ENTRY FORM CRE LS LS NUM LSB NUM MNAC LN MXAV LN MNAV MXMS RB NUM FLAG MXOC RB T1 L2 H2 T3 N4 E4 T5 T6 T7
36. dialogue Maintaining the integrity of each dialogue in case of multiple dialogue scenario by assigning unique transaction ids to each dialogue Invoking remote operation and managing the operation TCAP layer is a compound layer in the sense that it is composed of two sub layers namely Transaction Sublayer TSL and Component Sublayer CSL Transaction sublayer is responsible for establishing managing and maintaining the integrity of the dialogue whereas Component sublayer is responsible for packing the upper layer message into a component and assigning an invoke ID to the component When 57 is specified as a signalling system level 4 specifies a number of call control functions Indeed the circuit related mode of CCS7 is so closely C DOT CCS7 1 5 2 INTRODUCTION associated with controlling the set up and release of physical circuits that it is essential that some aspects of call control are defined within the user part specification in order to optimise the procedures that are adopted Application of the Level Structure The application of the level structure is illustrated in Fig 1 4 Exchanges A and B are directly connected by speech circuits denoted by the solid lines connecting the respective switch blocks A signalling link is also available between Exchanges and B denoted by the dotted line It is shown that level 4 the user part is closely associated with the control function of the exchange If
37. for CCS7 network entities is done separate from the exchange data In the Bare Minimum Data Cartridge BMDC SUM is not equipped This is so because 57 capability is not required at all the exchange sites and wherever required the SUM can be equipped over and above the exchange data The following procedure assumes that appropriate exchange release with CCS7 support has already been loaded by using the suggested procedures USER S MANUAL SUM RETROFIT PROCEDURE To equip SUM in a MAX switch in a principal or concentration TU position the following procedure is to be followed a In a working switch if all principal TUs are already equipped 7SU is to be equipped in a principal TU position unequip a non SUM type TU frame from the BM Else unequip a concentration TU frame Follow the standard procedure for deleting routes subscribers TGPs cards etc and unequip the frame Use the command UNEQ FRAME with the following parameters MOD NO BM number of the home BM RACK NO 1 2 3 FRAME NO 1 2 3 4 5 6 depending on the frame to be unequipped With this the status of the corresponding TIC TUC will become UNEQUIPPED b Pull out the TU frame if SUM is to be put in a principal TU position i e in rack number 1 Note In a working switch with available TU frame positions or in a switch being installed the above two steps should be skipped c Insert SUM frame in place of the ATU DTU removed or in a free TU
38. in BM and AM and form part of CCS7 subsystem These functions can be broadly categorised as USER S MANUAL 29 Chapter 3 Operator interface for activation deactivation blocking unblocking inhibiting uninhibiting of signalling links and linksets Data link allocating deallocation functions Switching functions to provide the switched access to data links Initialisation of the SUM which includes initial hardware diagnostics downloading of code data and other files initialisation of database and creation of other processes in the 507 Detection and recovery from hardware and software faults e Management of terminals and maintenance of PHCs and I channels Monitoring the health of SUM including PHCs and configuration management Diagnostics automatic and on demand e Overload and congestion control e Running audits on the database periodically and on demand Administration System The administration subsystem coordinates the following activities Execution of the administration related man machine command for addition deletion and modification of the status of various resources and the maintenance related man machine commands for testing and configuration management Generation of alarms and reports for the operator Generation of CCS7 related traffic reports Database Subsystem The data related to the CCS7 resources signalling links and terminals linksets routes route sets point c
39. of SUM 187 188 Chapter 11 START WHAT REASON OF FAILURE MOD L IS THE ACTIVATION S STS CONNECTION FAILED AT LOCAL END SEE THE BLK 7 STATUS OF VOICE AT THE BM CONTAINING SS7 LINK VOICE WO STATE DEACTIVATE YES THE LINK amp TRY CHECK THE IFC ES STATUS OF THAT SOME BM IFC SHOILD TIME BE INSERVICE IF THE REASON OF VOICE CKT BEING BUSY IS ETE FAILURE THEN GIVE A SOFT START TO THAT BM CORRECTIVE ACTIONS FOR LINK RESTORATION L2 ALIGNMENT INITIAL SOME OTHER L2 ALIGNMENT FAILED DUE ALIGNMENT LINK IN FAILED DUE TO DATA LINK FAILED LINKSET TO PHC UNAVAILABILITY IS BEING UNAVAILABILITY ACTIVATED OTHER EXCHANGE TRY ACTIVATION IS NOT AFTER SOME RESPONDING TIME WHEN ASK THE OTHER THE OTHER EXCHANGE LINK PERSONNEL TO ACTIVATION START IS OVER ACTIVATION FROM HIS END a IS REQUIRED NO 557 AVAILABLE N SEE CHAPTER 6 CHECK S IFTHE TEN N ka TO THE SS7 LINK ww INSS7BSY d lt Pd BRING THE TEN INSERVICE amp TRY ACTIVATION FIG 1 1 2 pu MODIFY NO7 THR YES AND GIVE A PART INT TO SUM amp TRY Pi LINK z ACTIVATION ARE AGAIN d THE PHCs 5 Ke qu d N KA NO BRING PHCs INSERVICE 8 LINK ACTIVATION AGAIN DESIGN CCS
40. parameters are to be given default values Note lt Self Point Code gt means the actual value of the SPC of the node etc Create a Remote GT towards SCP by using CRE GT command with the following parameters Gr Typel1 ISDN SUBS Point Code of SCP used as GT address gt PG lt Point Code of SCP gt SSN INAP RTINGIND DPCSSN Rest of the parameters are to be given default values This finishes 557 network data creation for MTP amp layers at SSP Data between STPs Create SS7 network data up to link set by following the procedure given in the chapter 8 of this document C DOT CCS7 CCS7 DATA CREATION FOR SSP APPLICATION The PC served parameter in the CRE LS of first STP from the SSP will contain the DPC s of second STP and SCP Similarly PC served parameter in the CRE LS of second STP from the SSP will contain the DPC s of first STP and SSP 2 Create Signalling Route Set CRE SRS There will be two signalling route sets towards STP 2 direction at first STP One route set will go towards the second STP and the other route set will have its DPC as that of SCP and both will have high priority linkset as that between STP1 and STP 2 In the SRS having DPC as that of SCP Sub System Number SSN list will have SCMG amp INAP Similarly in the STP1 direction there will be two SRS at STP 2 One route set will have the first STP s DPC and the other route set will have its DPC as that of SSP and both will hav
41. required will be no of BMs 1 10 1 11 and The min no of CCS7 terminals required will be 10x2 2 towards SCP 22 Total no of PHC terminals required will be 11 22 33 This means that HPC card will be required for 507 The value of terminal thresholds assuming 5 SHM cards will be as follows INT THR 11 40 x 100 30 12 terminals NO7 THR 100 3046 70 28 terminals USER S MANUAL 193 Chapter 12 HOME BM SUM BPU BM No 10 TOTAL No OF BMs 10 m CCS7 TRUNK BM No 3 C DOT EXCHANGE C 85 LINKS FIG 12 2 SIGNALLING NETWORK CONNECTIVITY FOR SSP VOICE ISUP TRUNKS CCS7 SIGNALLING LINKS TOTAL No OF CCS7 NODES 10 C 85 LINKS TO ALL THE BMs ARE REQUIRED IN SSP APPLICATION EVEN IF THESE DO NOT CONTAIN CCS7 TRUNKS DESIGN CCS7 UM CCS7 SSP 194 C DOT CCS7 Annexure CCS7 Data Creation for PSTN ISDN Application For creating data is order to realize the connectivity shown in Fig I 1 the following commands are executed in the order given below 1 CRE SPC Create Signaling Point Code SIG NW NW NAT SPC LST 1000 Signaling point code of node 2 CRE CGS Create Circuit Group Set CGS NUM 1 CGS number CGS NAME CCS71 CGS name SELF PC 1000 Self point code of the node A DEST PC 1001 Destination point code of node B SIG NW NW NAT USR
42. tante 18 2 1 Overview of C DOT DSS MAX Architecture 18 2 2 CC S7 Signalling Unit Module 2 2 E CURAS 20 SUM HE 23 D 1 SV Archite tip puoi PUE 23 9 24 Hardware uy u uuu u sua akaun 25 S S Architecture iii re i ie a e a rs 25 LL GS 225 500 toritate sse ee 81 A il Introd eti6n iore 81 42 IBUP Call Messa e 81 43 ISUF Terminating seine im e Cd Les 31 44 SUP Transit Ere erc nwa aa ne 34 Command DIFSGLDOEV L eoa eli nied aie Men 36 MEAT POG CHC DIO Nd gasses e A 36 5 2 Commando Directory 36 Peo Oma md ROW 37 Parameters mu Qu Q uns u Dau Sq a Gu 41 TO 41 6 2 Parameters Description cocer n D I nr SR ies RUN 41 Operator Command Sheets ys te rerba 56 7 1 Introduction B a ta trente 56 7 2 CCS7 Administration Commands Update 58 7 3 CCS7 Administration Commands Display 97 7 4 CCS7 maintenance Commands Update Class
43. 1 Engineering ConsrderatiOha usi Ere EE o EORR 12 2 Signalling Network Connectivity An Example 1 12 3 Signalling Network Connectivity Example 2 Annexure I CCS7 Data Creation for PSTN ISDN Application Annexure II CCS7 Data Creation for SSP Application Annexure CCS7 Related System Parameters sisi H HOME CCIT7 WORD CSUSRMN1 DOC 11 November 1998 1 Introduction 11 PURPOSE amp SCOPE The purpose of this document is to provide complete and detailed information on the implementation of ITU T formerly CCITT Common Channel Signalling System No 7 CCS7 in C DOT DSS MAX switching systems The architecture of the signalling unit its MML interface and operations and maintenance aspects are discussed in detail This document would be useful for anyone interested in gathering detailed information about C DOT CCS7 as well as to the exchange O amp M personnel For technical persons involved in design or testing and validation of 57 this document will prove to be a good starting point in understanding the implementation of CCS7 in the switch 1 2 ORGANISATION OF CONTENTS There are twelve chapters in the document including the present one In the following sections of this chapter the advantages of common channel signalling systems ov
44. 1 1 Update GENERAL INFORMATION COMMAND Create a Signalling Relation MNEMONIC CRE SRS FUNCTION create a route set describing the signalling relation between OPC i e self PC and a DPC PARAMETERS SRS NUM DPC HI RTBL and LO RTBL ISSN LSTI REQUIRED REMARKS ASRS isa collection of signalling routes between two nodes These can be direct routes or indirect routes Direct Routes run directly between the two nodes whereas indirect routes run via one or more signal transfer points STPs In HI RTBL link set number which can carry signalling message towards the specified DPC is to be given LO RTBL will have the link set number which is going towards STP if any SSN LST specifies the sub system numbers associated with this SRS Sub systems can be INAP along with SCMG or ISUP Note SSN LST is presently available only in 1 5 x x releases 58 C DOT CCS7 OPERATOR COMMAND SHEETS CRE SRS PARAMETER ENTRY FORM CRE SRS CREATE A SIGNALLING RELATION SRS NUM DPC HI RTBL LO RTBL SSN LST INAP amp SCMG CRE SRS OUTPUT FORM CREATE SIGNALLING ROUTESET REPORT Signalling Route Set Number 9 Self Point Code Destination Point Code Signalling Network High Priority Route Table Low Priority Route Table Subsystem number list SCMG 65535 NONE NONE INAP 65535 NONE NONE Global Titles Associated TYPE1 ISDN SUBS 998 Note These parameters are available in 1 5 x x release onl
45. 2 Only after the highest module has completed its initialization can the lower module modules start their initialization however the levels of initialization can be different If AM gets initialized when all other modules are in initialized state all these modules will initialize to stable clear Irrespective of level of initialization of AM BMs can be initialized independently However only 16 BMs can down load code patch parallel at a time After home BM containing SUM has completed initialization SUM will start initialization Relation between Home BM Initialisation and 7SU Initialisation Whenever the home BM goes for initialization SUM will also go for initialization The relationship between home BM initialization and SUM initialization is given in the table below USER S MANUAL 175 Chapter 10 Home BM Initialisation Corresponding 7SU initialisation Code load Code load Patch load Patch load Soft start Soft start Stable clear Stable clear 10 3 CONDITIONS OF INITIALIZATION 176 The system can go for initialization in two ways by itself or e asaresult of operator command The reasons for spontaneous initialization can be many and are summarized in the table below Level of Reasons Initialisation Code load System power off on or reset Unrecoverable error in code area in simplex memory condition Data comparison error in code area e More than a certain number of recoveries in certain time
46. 5 Numeric POSSIBLE VALUES 0 to 214 1 i e 0 to 16383 Range not allowed DEFAULT VALUE No default value in some commands Else 65534 i e none defined REMARKS The destination point code for a CGS In case of LSB since multiple nodes can be reached via one LSB consider the entire route between two non adjacent point codes more than one point codes can be defined 6 2 8 DPC Destination Point Code PARAMETER NAME Destination Point Code MNEMONIC DPC TYPE 5 Numeric POSSIBLE VALUES 0 to 214 1 i e 0 to 16383 Range or set not allowed DEFAULT VALUE None Essential Parameter REMARKS The point code of the destination of the outgoing message is called DPC 6 2 9 EC OPT Error Correction Option PARAMETER NAME Error Correction Option MNEMONIC EC OPT TYPE 5 ASCII POSSIBLE VALUES 1 BASIC 2 PCR Range or set not allowed DEFAULT VALUE None Essential parameter REMARKS Defines the error correction method for a link set Basic option is used to terrestrial link whereas PCR Preventive Cycle Retransmission is used for long delay routes e g satellite routes 6 2 10 GT Global Title PARAMETER NAME 44 Global Title C DOT CCS7 MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS PARAMETERS DESCRIPTION GT ASCII or Numeric 4 fields Subfield 1 T Type None TYPE254 TYPE253 Subfield 22 NUMPLAN NONE UNKNOWN ISDN SPARE2 DATA TELEX MAR MOBILE LAND MOBILE ISDN MOBILE Subfield 3 NAI NONE
47. 7 UM CCS7 CAL C DOT CCS7 ROUTINE MAINTENANCE SANAT GIVE MOD LINK STS COMMAND AND SEE THE REASON OF FAILURE OF COMMAND LONG SOME OTHER TERMINAL DATA LINK IS NOT ALIGNMENT LINK IS BEING NOT PLES AVAILABLE FAILED ACTIVATED AVAILABLE SAME PROCEDURE ASK THE OTHE TRY ACTIVATION AS CONNECTION EXCHANGE AFTER SOME TIME FAILED AT LOCAL PERSONNEL TO IS END AT FIG 3 2 TRY ACTIVATION THE REQUIRED FROM HIS END lt No OF NO AVAILABLE SEE CHAPTER 6 PROBABLY LINK ID IS NOT PROPER ge MODIFY No 7 THR amp GIVE A PART TO SUM TRY LINK ACTIVATION AGAIN ASK THE OTHER EXCHANGE ABOUT THE LINK ID GIVEN THERE al IFNOT CORRECT CHANGE AND TRY M i ACTIVATION AGAIN IS N ARE EN TEN OF SS7 lt LINK SERVICE INS S7BSY ES A WA NO NO BRING PHCs INSERVICE 8 TRY ACTIVATION BRING THE DATA AGAIN LINK INSERVICE amp TRY ACTIVATION AGAIN FIG 11 3 CORRECTIVE ACTIONS FOR LINK RESTORATION DESIGN CCS7 UM CCS7 CA1 USER S MANUAL 189 12 Engineering the SUM 12 1 ENGINEERING CONSIDERATIONS The only growth element in SUM is the SHM card SHM card contains Protocol Handler Controller PHC terminals which can be configured as signalling terminals or internal message
48. ALL PC NUM ALL DISPL NET STS OUTPUT FORM DISPLAY NETWORK STATUS REPORT DPC NUM OPC NUM 9998 1101 DPC Signalling Network NW NAT Accessibility ACCESSIBLE Signalling Route Set Number 2 Link Set Bundle Number 2 Circuit Group Set Number 2 Status of routes route id status High Priority 2 AVAIL NONE LOC UNAVAIL Low Priority NONE LOC UNAVAIL NONE LOC UNAVAIL Current Priority SSN Report SSN status bak dpc bak net id bak ssn status NONE PROHB NONE NONE NONE PROHB Similarly network status of all the point codes of the node will be displayed oe This parameter is present in 1 5 x x release only 122 C DOT CCS7 OPERATOR COMMAND SHEETS 7 5 3 Display Block Status MAINTENANCE COMMAND Display Block Status MNEMONIC DISPL BLK7 STS CLASS MENU POSITION 2 13 3 GENERAL INFORMATION COMMAND Display Block 7 Status MNEMONIC DISPL BLK7 STS FUNCTION This command displays the blocking status of 7 circuits PARAMETERS TEN A range of TENs can be given REQUIRED REMARKS Inthe output response the following information about the TENs specified is shown Local blocking status Reason for blocking Remote blocking status Maintenance status Datalinks are always shown to be in busy state USER S MANUAL 123 Chapter 7 DISPL BLK7 STS PARAMETER ENTRY FORM DISPL BLK7 STS TEN DISPLAY BLOCK 7 STATUS 7 1 1 3 17 to 7 1 1 3 28 DISPL BLK7 STS OUTPUT FO
49. AR OUTPUT FORM MODIFY TRUNK GROUP CHARACTERISTICS REPORT Trunk Group Number Trunk Group Name Rank of Digits Trunk Group Hunt Type Min DGT Seize FWD Trunk Priority Prefix Digits Trunk Group Facility Trunk Group Category Answer Circuit Status Signalling Information Continuity Check Indicator Echo Suppression Indicator Satellite Indicator Answering Circuit Information The changed parameter is confirmed USER S MANUAL 45 TAX BW 1 SEQ 1 1 Nil MH 1 2WP ISUP CRG CHB CHK NRQD ECH SP NRQD NO SAT 5770000 137 Chapter 7 7 6 6 Display Trunk Group Characteristics TRUNK amp ROUTING ADMINISTRATION Display Trunk Group Characteristics COMMAND MNEMONIC DISPL TGP CLASS MENU POSITION 1 4 1 Display GENERAL INFORMATION COMMAND Display Trunk Group Characteristics MNEMONIC DISPL TGP FUNCTION The command displays the characteristics of a trunk group PARAMETERS TGP NUM TGP NAME REQUIRED REMARKS Only one of the two input parameters needs to be specified The following parameters have been added or modified in the existing CEP to accommodate CCS7 related information a Signalling Information Used to specify ISUP charging method ISUP CRG CHB Charge Band method ISUP CRG CHW Charge Unit method b CGS number and name of which this TGP is a constituent c Line Signalling Scheme DIG CCS i e common channel Register Signalling Scheme CCITT R7 i e CCS7
50. ARAMETER ENTRY FORM DISPL LS STS DISPLAY LINK SET STATUS LS NUM ALL DISPL LS STS OUTPUT FORM DISPLAY LINK STATUS REPORT LS NUM LSB NUM LOG LINK ID DATA LINK PHC TERMINAL STATUS 1 1 1 7 1 1 17 18 7 1 3 10 5 Activated amp Available 7 1 1 3 18 Out of service 1 1 2 2 7 1 1 21 18 7 1 3 9 5 Activated amp Available 2 2 7 1 1 7 18 Out of service 120 C DOT CCS7 OPERATOR COMMAND SHEETS 7 5 2 Display Network Status MAINTENANCE COMMAND Display Network Status DISPL NET STS CLASS MENU POSITION 2 13 2 Display GENERAL INFORMATION COMMAND MNEMONIC FUNCTION PARAMETERS REQUIRED REMARKS USER S MANUAL Display Network Status DISPL NET STS This command displays the accessibility status of specific all point code s in the one or all the signalling network s NET ID PC NUM The value of the accessibility flag in the output response can be not accessible or accessible destination can be inaccessible if all the signalling routes to it are unavailable locally or remotely The availability of SRS further depends upon the health of signalling links serving the SRS This command should be used whenever 57 calls to any destinations are not getting through It will be known via this command whether the fault is local or due to the distant end 121 Chapter 7 DISPL NET STS PARAMETER ENTRY FORM DISPL NET STS DISPLAY NETWORK STATUS NET ID
51. BHCC with BPC CPU If the volume of traffic towards a destination exceeds 80 000 BHCC one more signalling link apart from the two existing should be used In the network of Fig 6 1 total PHC terminals that will be used for CCS7 signalling 2424242 8 v USER S MANUAL 191 Chapter 12 SP SP CCS7 TRUNKS J HOME C DOT EXCHANGE CCS7 TRUNKS CCS7 TRUNKS D VOICE ISUP TRUNKS Fa C 85 LINKS SP CCS7 SIGNALLING LINKS SR FIG 12 1 SIGNALLING NETWORK CONNECTIVITY FOR PSTN ISDN DESIGN CCS7 UM CCS7 SNC 192 C DOT CCS7 ENGINEERING THE SUM This means that out of the 26 signalling terminals only 8 will be utilised and 18 will be spare In order to economize on SHM equipage it is advisable here that only two 2 SHM cards be equipped If it is so then 16 N m 10 still 2 signalling terminals will be spare By keeping in mind prudent spare card equipage philosophy in addition to these two 2 SHM cards one more may be kept as spare and used only in case of failure of one of the two equipped cards 12 3 SIGNALLING NETWORK CONNECTIVITY EXAMPLE 2 In this example the requirement of SUM resources in a SSP application is calculated The connectivity and equipage of the SSP is depicted in Fig 12 2 Here The number of BMs 10 The number of other network nodes to which the SSP is connected 10 The no of C 85 terminals
52. C DOT 57 USER S MANUAL E Section No 407 027 0726 System RE Practices Draft 01 November 1998 C DOT 57 USER S MANUAL 9 1998 C DOT Printed in India C DOT CCS7 USERS MANUAL DRAFT 01 NOVEMBER 1998 KARTIKA 2055 SERIES 000 OVERVIEW CSP SECTION NO 407 027 0726 THIS C DOT SYSTEM PRACTICE REFERS TO THE C DOT SIGNALLING SYSTEM 7 ABBREMATEDAS C DOT SS7 IN THE REST OF THIS PUBLICATION THE INFORMATION IN THIS SYSTEM PRACTICE IS FOR INFORMATION PURPOSES AND IS SUBJ ECT TO CHANGE WITHOUT NOTICE A COMMENT FORM HAS BEEN INCLUDED AT THE END OF THIS PUBLICATION FOR READERS COMMENTS IF THE FORM HAS BEEN USED COMMENTS MAY BE ADDRESSED TO THE DIRECTOR SYSTEMS CENTRE FOR DEVELOPMENT OF TELEMATICS 39 PUSA ROAD NEW DELHI 110 005 1998 BY C DOT NEWDELH Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Table of Contents INTEOdUCRIQN IE 5 121 Purpose amp SCOPE au ied ertet c Wied 5 1 2 Organisation of Contents u odis fa ba 5 1 3 Overview of Signalling Systems een eder a a d eaae 6 1 4 Advantages of Common Channel Signalling 6 1 5 Overview of Signalling System 10 1 6 Protocol SpecificabiOTis ukan us rrr n eve eek gne ae vea E 17 Capability in C DOT DSS
53. COMMAND Delete a Circuit Group Set MNEMONIC DEL CGS FUNCTION To delete an existing circuit group set PARAMETERS CGS NUM CGS NAME REQUIRED REMARKS The deletion is possible only if no linkset bundle is associated to that CGS The user can specify either the CGS number or name USER S MANUAL 75 Chapter 7 DEL CGS PARAMETER ENTRY FORM DEL CGS DELETE CIRCUIT GROUP SET CGS NUM CGS NAME CRE CGS OUTPUT FORM REPORT FOR DEL CGS Circuit Group Set Number Circuit Group Set Name 76 C DOT CCS7 OPERATOR COMMAND SHEETS 7 2 10 Create a Linkset Bundle for this Exchange ADMINISTRATION COMMAND Create a Linkset Bundle for this Exchange MNEMONIC CRE LSB CLASS MENU POSITION 1 31 10 Update GENERAL INFORMATION COMMAND Create Linkset Bundle MNEMONIC CRE LSB FUNCTION This command creates a linkset bundle for a CGS PARAMETERS LSB NUM CGS NUM CGS NAME LM MTHD STP USER DEST PCS REMARKS Creation of linkset bundle associates one or more linksets with that LSB Care must be taken that a CGS must exist between the OPC and DPC between which the LSB is required In the SECOND link management the allocation of signalling terminals level2 functionality is automatic and that of signalling datalinks is manual USER S MANUAL 77 Chapter 7 CRE LSB PARAMETER ENTRY FORM CRE LSB CREATE LINK SET BUNDLE FOR THIS EXCHANGE LSB NUM CGS NUM CGS NA
54. INS with the following parameters MOD NO Home BM Number UNIT ID ID of the 7SU the value given for the parameter TIC ID in EQUIP FRAME The command will be rejected if the home BM goes down or equipage of C 85 PHC terminal with home BM is not available With the corresponding TIC becoming INS ACT the SUM gets a path to the APC and code load request from it is now entertained at the APC A critical alarm will now be raised for SUM on the ADP After successful code patch amp data loading SUM establishes ETE with APC IOP amp home BPC The alarm mentioned above is now cleared from the Alarm Display Panel and a Load Pass Report is displayed on the OOD terminal and also printed on the printer If on equipping the first SHM card and putting the TUC in service SUM initialization does not start may be the PHC terminals are not in services INS NRM After SUM comes up and module status is shown as IN SERVICE in DISPL SYS ALL command the retrofit of the SUM is complete Now create CCS7 data by following the procedures given in Annexes I and II 9 8 UNEQUIPPING SUM IN A WORKING SWITCH The procedure for unequiping SUM in a working switch is given below USER S MANUAL 171 Chapter 9 172 Delete all Signalling Point Codes Signalling Route Sets Signalling Links and related data Force out all terminal SHM cards in the SUM frame by using the command FRC TRM OOS with the following parameters
55. ISDN User Part ISUP Signalling Connection Controller Part SCCP and Transanction Capabilities Application Part TCAP are available for PSTN ISDN and Intelligent Network applications Monitoring and measurements as per ITU T Rec Q 752 have been implemented In future Mobile Application Part MAP and Operations amp Maintenance Application Part OMAP will be available C DOT CCS7 3 1 Chapter 3 SUM Architecture SYSTEM ARCHITECTURE CCS capability in C DOT DSS MAX exchanges is implemented in the form of the 57 Signalling Unit Module SUM The SUM hardware is packaged into a standard equipment frame The equipage of the frame is similar to that of a terminal unit In a Base Module rack the SUM frame can be placed in any Terminal Unit TU frame position i e principal frame or concentration frame position In case it is equipped in the principal frame position it interfaces with the Time Switch via a Terminal Unit Controller TUC on a 128 channel PCM link operating at 8 Mbps See Fig 3 1 However the SUM can not be equipped with a V5 Unit VU in one concentration chain i e if VU is equipped as the principal TU then SU can not be concentrated behind it and vice versa Also SUM can not be equipped in a remote BM RBM Similar to a TU the SUM has terminal cards i e Signalling Handler Module Cards SHM Each SHM card supports upto 8 Protocol Handler PHC terminals The PHC terminals can be configured as CCS7
56. L LEVEL4 LEVEL 3 LEVELS MTP LEVEL 1 SWITCH BLOCK CONTROL LEVEL4 MTP LEVEL 3 LEVEL 2 LEVEL 1 SIGNALLING LINK FIG 1 4 APPLICATION OF THE LEVEL STRUCTURE DESIGN CCS7 UM CCS7 LS C DOT CCS7 INTRODUCTION 1 5 2 1 PROTOCOL SPECIFICATIONS To ensure compatibility between various telephony systems ITU T formerly CCITT has specified rules and procedures to be followed by telephony systems Common Channel Signalling System No 7 specified by ITU T CCS7 consists of the international specifications for CCS Common Channel Signalling implementation The model specific for CCS7 corresponds to the OSI Open System Interconnections model of ISO International Standards Organisation The relevant ITU T specifications are The Message Transfer Part MTP specified in recommendations Q 701 to Q 709 The Signalling Connection Control Part SCCP specified in recommendations Q 711 to Q 714 The Transaction Capabilities Application Part TCAP specified in recommendations Q 771 to Q 775 The Telephone User Part TUP specified in recommendations Q 721 to Q 725 e The ISDN User Part ISUP specified in recommendations Q 761 to Q 766 The Data User Part DUP specified in recommendation Q 741 e Monitoring and Measurement specified in recommendations Q 791 and Q 752 The Operation and Maintenance Application P
57. L INFORMATION COMMAND Delete Trunks from a Trunk Group MNEMONIC DEL TRK FUNCTION delete or more TEN s from a TGP PARAMETERS TGP NUM TGP NAME TEN REQUIRED REMARKS The TGP should be out of service OOS OPR The deleted TEN s go to the free list which can be seen through DISPL TEN command USER S MANUAL 131 Chapter 7 DEL TRK PARAMETER ENTRY FORM DEL TRK DELETE TRUNKS FROM A TRUNK GROUP TGP NUM 1 TGP NAME NONE TEN 715 1720 DEL TRK OUTPUT FORM DELETE TRUNKS FROM A TRUNK GROUP REPORT TRUNK GROUP NUMBER 1 TRUNK GROUP NAME TGP20 LIST OF TENS DELETED 7 1 3 17 20 132 C DOT CCS7 OPERATOR COMMAND SHEETS 7 6 4 Add Trunks to a Trunk Group MAINTENANCE COMMAND Add Trunks to a Trunk Group MNEMONIC ADD TRK CLASS MENU POSITION 1 3 4 Update GENERAL INFORMATION COMMAND Add Trunks to a Trunk Group MNEMONIC ADD TRK FUNCTION This command is used to add free trunks to a trunk group The added trunks assume all the characteristics of the trunk group PARAMETERS TGP NUM TGP NAME TEN TEN NO7 REQUIRED REMARKS The trunk group should be Out Of Service OOS OPR before this command is attempted USER S MANUAL 133 Chapter 7 ADD TRK PARAMETER ENTRY FORM ADD TRK ADD TRUNKS TO A TRUNK GROUP TGP NUM 45 TGP NAME NONE TEN NONE TEN NO7 7 1 2 47 00 ADD TRK OUTPUT FORM 134 ADD TRUNKS TO A TRUNK GROU
58. LLING LSB A LS A PC SERVED PC OF STP1 B AND SCP D DATA LNK TIME SLOTS FOR SIGNALING SRS1 A DPC POINT CODE OF SCP HI RTBL LINK SET A SSN LST SCMG amp INAP 5852 DPC POINT CODE OF STPI B HI RTBL LINK SET A SSN LST ISUP GT TYPE1 ISDN SUBS lt SELF GT TYPE1 ISDN SUBS lt DPC i e PC SCP gt C DOT SBM STP1 POINT CODE B TOWARDS SPA POINT CODE B OPC B DPC A B PHYSICAL PCM CIRCUITS FOR SIGNALLING LSB B LS SERVED PC OF SSP A DATA LNK TIME SLOTS FOR SIGNALING SRS B DPC POINT CODE OF SSP A HI RTBL LINK SET SSN LST SCMG amp INAP amp ISUP TOWARDS SPC CGS C1 OPC B DPC CI PHYSICAL PCM CIRCUITS FOR SIGNALLING LSB Cl LS PC SERVED PC OF STPZ C AND OF SCP D DATA LNK TIME SLOTS FOR SIGNALING SRS 1 C1 DPC POINT CODE OF STP2 C HI RTBL LINK SET SSN LST ISUP SRS 2 C2 DPC POINT CODE OF SCP D HI RTBL LINK SET SSN LST SCMG amp INAP Towards STP2 204 C DOT CCS7 CCS7 DATA CREATION FOR SSP APPLICATION C DOT SBM STP2 POINT CODE TOWARDS SPB CGS C OPC C DPC B TGP C PHYSICAL PCM CIRCUITS FOR SIGNALLING LSB C LS C PC SERVED DATA LNK SRS 1 DPC SSN LST ISUP SRS 2 Q DPC POINT CODE OF SSP A HI RTBL LINK SET C SSN LST SCMG amp INAP PC OF STP1 B AND PC OF SSP A TIME SLOTS FOR SIGNALING POINT CODE OF STP1 B HI RTBL LINK
59. ME LM MTHD MX MSGSZ STP USER DEST PCS e 2 CGS2 LM SECOND DATA272 65535 9998 CRE LSB OUTPUT FORM 78 CREATE LINK SET BUNDLE REPORT Link Set Bundle Number Circuit Group Set Number Circuit Group Set Name Self Point Code Destination Point Code Signalling Network Link Management Method Maximum Message Size STP User DEST PCs 2 2 CGS2 1104 9998 NW NAT SECOND DATA272 9998 C DOT CCS7 OPERATOR COMMAND SHEETS 7 2 11 Delete Linkset Bundle ADMINISTRATION COMMAND Delete Linkset Bundle MNEMONIC DEL LSB CLASS MENU POSITION 1 31 11 Update GENERAL INFORMATION COMMAND Delete a Linkset Bundle MNEMONIC DEL LSB FUNCTION To delete a particular link set bundle PARAMETERS LSB NUM REQUIRED REMARKS At the time of command execution no linkset should be associated with this link set bundle Also the LSB should not be serving any SRS USER S MANUAL 79 Chapter 7 DEL LSB PARAMETER ENTRY FORM DEL LSB DELETE LINK SET BUNDLE LSB NUM DEL LSB OUTPUT FORM DELETE LINK SET BUNDLE REPORT Link Set Bundle Number 80 C DOT CCS7 OPERATOR COMMAND SHEETS 7 2 12 Modify Linkset Bundle Characteristics ADMINISTRATION COMMAND Modify Linkset Bundle Characteristics MNEMONIC MOD LSB CHAR CLASS MENU POSITION 1 31 12 Update GENERAL INFORMATION COMMAND Modify linkset bundle characteristics MNEMONIC MOD LSB CHAR FUNCTION To modify the l
60. METERS REQUIRED REMARKS USER S MANUAL Modify an existing Global Title MOD GT CHAR In an existing GT Point code Nature of network SSN etc can be modified GT PC SIG NW SSN NEW ADR NEW NAI RTIND GT can be modified by the command 91 Chapter 7 MOD GT CHAR PARAMETER ENTRY FORM MOD GT CHAR MODIFY A GLOBAL TITLE GT Type1 ISDN SUBS 1111 PC 9998 SIG NW NW NAT SSN ISUP NEW ADR NONE NEW NAI NONE RTIND DPCSSN MOD GT CHAR OUTPUT FORM Modify Global Title Global Title TTYP NUMPL NAI ADR TYPE1 ISDN SUBS 111 1 Point Code 9998 Subsystem Number ISUP New Address New Nature of Address Indicator NONE Routing Indicator DPCSSN 92 C DOT CCS7 OPERATOR COMMAND SHEETS 7 2 18 Delete a Global Title Translation Note This command is available only in 1 5 x x release ADMINISTRATION COMMAND Delete a Global Title MNEMONIC DEL GT CLASS MENU POSITION 1 31 16 Update GENERAL INFORMATION COMMAND Delete an existing Global Title MNEMONIC DEL GT FUNCTION Delete an existing Global Title translation PARAMETERS GT REQUIRED REMARKS Before deleting make sure that no routing or service data uses this GT USER S MANUAL 93 Chapter 7 DEL GT PARAMETER ENTRY FORM DELETE GLOBAL TITLE TRANSLATION Type1 ISDN SUBS 1111 DEL GT OUTPUT FORM Delete Global Title Report Global Title TTYP NUMPL NAI ADR TYPE1 ISDN SUBS 1 111
61. Modify Charge Band Charge Rate Number Association ADMINISTRATION COMMAND MNEMONIC MOD CHB CRG CLASS MENU POSITION 1 30 8 Update GENERAL INFORMATION COMMAND MNEMONIC FUNCTION PARAMETERS REQUIRED REMARKS USER S MANUAL Modifv Create delete modifv Charge Band to Charge Rate Number association MOD CHB CRG To Modifv a Charge Band to Charge Rate Number Association OPR TYP CRG BND CRG RTN If CCS7 TGP has charging method as ISUP CRG then CCS7 calls will be charged according to the charge band coming from distant end For each charge Band being used there should be an association of the band with charge rate number This command is used to create a new charge Band CRE CHB associate disassosiate charge rate number with it ASSCT DASSCT CRN modify an existing charge band or delete an existing charge band DEL CHB Multiple Charge Rate Numbers can be associated with a single charge Band But all these Rate numbers should have all the characteristics same except initial charge Initial charge can be different 87 Chapter 7 MOD CHB CRG PARAMETER ENTRY FORM MOD CHB CRG MODIFY CHARGED BAND CHARGE RATE NUMBER ASSOCIATION OPR TYP CRE CHB CRG BND 5 CRG RTN 40 MOD CHB CRG OUTPUT FORM OPERATION TYPE CRE CHARGE BAND NUMBER CHARGE RATE NUMBER 5 40 88 C DOT CCS7 OPERATOR COMMAND SHEETS 7 2 16 Create Global Title Translation Note ADMINISTRATION MNEMO
62. NAC LNK MXAV LN Characteristics MNAV LN PC LST CRE GT Create Global Title GT PC SIG NW SSN NEW NAI 38 C DOT CCS7 10 CRE LSB Create Link Set Bundle For LSB NUM CGS NUM CGS NAME This Exchange LM MTHD MX MSGSZ STP USER DEST PCS COMMAND DIRECTORY S No Command Command Name Position Defined Parameters Mnemonic x IADR IRTIND 16 MOD GT CHAR Modify a Global Title GT PC SIG NW SSN INEW NATI RTIND 17 DEL GT Delete Global Title GT Translation CCS7 COMMANDS DIRECTORY Contd CLASS 32 Number 7 Administration Display Commands Information s DISPL CGS NUM NAME Display Circuit Group Set GS NUM CGS NAME Number to Name Mapping 1 DISPL GT Displav Global Title GT Translation CLASS 12 Number 7 Maintenance Update Command TST SGNL LNK Test tisma Tank LSB NUM LOG LNK 2 MOD LS STS Modify Link Set Status LS NUM ACTION 2 MOD LNK STS Modify Link Status LSB NUM LOG LNK ACTION MOD BLK7 STS Modify Block 7 Status BLK TYP TEN USER S MANUAL 39 Chapter 5 CLASS 13 Number 7 Maintenance Display Commands DISPL LS STS Display Link Bet Statis LS NUM DISPL NET STS Display Network Status NET ID PC NUM DISPL BLK7 STS Display Block 7 Status TEN CLASS 30 Charge Calendar Management Update 1 MOD CHB CRG Modify Charge Band Charge OPR TYP CRG BND Rate Number Association CRG RTN CLASS 41 Charge Calendar Management Display 1
63. NIC This command is available only in release 1 5 x x COMMAND Create Global Title Translation CRE GT CLASS MENU POSITION 1 31 15 Update GENERAL INFORMATION COMMAND MNEMONIC FUNCTION PARAMETERS REQUIRED REMARKS USER S MANUAL Create Global Title Translation CRE GT To Create a Global title translation for SCCP message routing GT PC SIG NW SSN INEW ADRI NEW NAI RTIND This command is used to create a Global Title translation for SCCP message routing Global title specifies whether the routing of message is based on DPC amp SSN of the destination or on GT itself If GT is used the new NAI or new Address may be specified 89 Chapter 7 CRE GT PARAMETER ENTRY FORM CREATE GLOBAL TITLE TRANSLATION GT Type1 ISDN SUBS 1111 PC 9998 SIG NW NW NAT SSN INAP NEW NAI NONE NEW ADR NONE RTIND DPCSSN CRE GT OUTPUT FORM CREATE GLOBAL TITLE REPORT GLOBAL TITLE TTYP NUMPL NAI ADR TYPE1 ISDN SUBS 1 111 POINT CODE 9998 SIGNALLING NETWORK NW NAT SUBSYSTEM NUMBER INAP NEW ADDRESS NEW NATURE OF ADDRESS INDICATOR NONE ROUTING INDICATOR DPCSSN 90 C DOT CCS7 OPERATOR COMMAND SHEETS 7 2 17 Modify a Global Title Note This command is available only in release 1 5 x x ADMINISTRATION COMMAND Modify a Global Title MOD GT CHAR CLASS MENU POSITION 1 31 17 Update MNEMONIC GENERAL INFORMATION COMMAND MNEMONIC FUNCTION PARA
64. Ns corresponding to 7 signalling links The TEN X X X X 16 and hence time slot 15th will have logical link id as 0 6 CRE SRS Create Signaling Route Set SRS NUM 1 Signaling route set number DPC 1001 Destination point code SIG NW NW NAT PR1 RT TBL 1 High priority route table PR2 RT TBL NONE If low priority route code is not to be given Rest of the parameters are given the default value After each command appropriate display commands should be used to confirm the data created Also see notes at the end for description of some important parameters Note 1 Related Parameters TGP STA status should always be bothway BW SIG INF Signalling Information parameter controls the charge method to be used for this TGP at TAX and nature of address indication for STD ISD calls The parameters are described as follows ISUP CRG CHB If SIG INF is set to ISUP CRG CHB Charging will be done according to charge Band message coming from remote end when the exchange is acting as a local exchange and expecting charging information from TAX Charge Band contains a Band number corresponding to which a charge rate association should be there This Band is used by exchange to refer to the charge rate number and then charging is done according to that charge rate Charge rate number Charge Band association is done by command MOD CHB CRG Similarly if the exchange is TAX then the charge rate number
65. OR SSP APPLICATION DATA FOR SS7 NETWORK WHEN SSP IS CONNECTED DIRECTLY TO SCP C DOT SBM SSP POINT CODE A POINT CODE A CGS A OPCzA DPC A PHYSICAL PCM CIRCUITS FOR SIGNALLING LSB A LS A PC SERVED PC OF SCP D DATA LNK TIME SLOTS FOR SIGNALING SRS A DPC POINT CODE OF SCP HI RTBL LINK SET A SSN LST SCMG amp INAP GT TYPE1 ISDN SUBS lt SELF PC SELF GT GT TYPE1 ISDN SUBS lt DPC i e PC of SCP gt REMOTE GT USER S MANUAL 201 Annexure II II 1 2 Data creation between SCP and SSP when STPs are involved 202 Data between SSP and STP Create SS7 network data up to link set by following the procedure given in the document chapter 8 of this document The PC served parameter in the CRE LS will contain the DPC s of STP and SCP Create Signalling Route Set CRE SRS There will be two signalling route sets One route set will go towards the STP and the other route set will have its DPC as that of SCP and both will have high priority linkset as that between SSP STPI In the SRS having DPC as that of SCP Sub System Number SSN list will have SCMG amp INAP Rest of the parameters are to be filled in the same way as described in the chapter 8 of this document Create a Self Global Title GT by giving CRE GT command with the following parameters GT Typel1 ISDN SUBS Self Point Code used as GT address gt PC lt Self Point Code gt SSN INAP Rest of the
66. OS OPR 143 Chapter 7 7 6 8 Display Terminal Status MAINTENANCE COMMAND MNEMONIC DISPL TRM STATUS Display Terminal Status CLASS MENU POSITION 283 Display GENERAL INFORMATION COMMAND MNEMONIC FUNCTION PARAMETERS REQUIRED REMARKS 144 Display the status of the specified terminal DISPL TRM STATUS Display the status of the specified terminal STAT TRM TML TYP TEN DIRNO Command can be used to see the status of PHC terminals C DOT CCS7 OPERATOR COMMAND SHEETS DISPL TRM STATUS PARAMETER ENTRY FORM DISPL TRM STATUS STAT TRM TRM TYP TEN DIRNO DISPLAY TERMINAL STATUS ALL PHC 1 1 2 7 2101 1 2 7 4 DISPL TRM STATUS OUTPUT FORM PHC STATUS INTERROGATION REPORT TML TYPE NEW STATUS STAT TRM PHC PHC PHC PHC USER S MANUAL 1 1 2 7 1 OOS OPR 1 1 4 7 2 OOS OPR 1 1 2 7 3 OOS OPR 1 1 2 7 4 OOS OPR 145 Chapter 7 7 6 9 Start Stop Traffic Report MAINTENANCE COMMAND Start Stop Traffic Report MNEMONIC START STOP TRF CLASS MENU POSITION 1 9 1 2 RPT Update GENERAL INFORMATION COMMAND Start Stop Traffic Report MNEMONIC Start Stop TRF RPT FUNCTION start and stop traffic report PARAMETERS REQUIRED RPT TYP REMARKS This command be used to start or stop CCS7 related traffic reports Two traffic reports are supported for CCS7 LNK REP for link report and RTSET REP for signalling route set rep
67. P REPORT TRUNK GROUP NUMBER 45 TRUNK GROUP NAME TAX BW SUCCESSFUL TENS 7 1 3 17 20 FAILED TENS C DOT CCS7 OPERATOR COMMAND SHEETS 7 6 5 Modify Trunk Group Characteristics MAINTENANCE COMMAND Modify Trunk Group Characteristics MNEMONIC MOD TGP CHAR CLASS MENU POSITION 1 3 5 Update GENERAL INFORMATION COMMAND MNEMONIC FUNCTION PARAMETERS REQUIRED REMARKS USER S MANUAL Modify Trunk Group Characteristics MOD TGP CHAR All the parameters values mentioned below can be modified through this command TGP NUM TGP NAME LIN SIG REG SIG MF SIG RNK DGT TRK PRI PFX DGT TGP FCY IDGT SZFDI ITGP CATI HNT TYP SIG INF CONT CHK ECHO SUP SAT IND AC STA AC INFO When TGP NUM is entered the system gets the current values of all the command parameters and displays them The operator can than go to the appropriate parameter s and modify them 135 Chapter 7 MOD TGP CHAR PARAMETER ENTRY FORM MOD TGP CHAR MODIFY TRUNK GROUP CHARACTERISTICS TGP NUM TGP NAME LIN SIG REG SIG MF SIG RNK DGT TRK PRI PFX DGT TGP FCY TGP CAT HNT TYP DGT SZFD SIG INF CONT CHK ECHO SUP SAT IND AC STA AC INFO 45 TAX BW DIG CCS CCITT R7 INVALID 1 1 NIL MH Only this parameter say is changed 1 SEQ 3 ISUP CRG CHB CHK NRQD ECH SP NRQD NO SAT 2WP 5770000 C DOT CCS7 OPERATOR COMMAND SHEETS MOD TGP CH
68. PHC terminals Threshold of free 7 PHC terminals INT THR Threshold of free internal C 85 PHC terminals FREE PHC 2 Free terminals threshold for clearing non urgent NUG CLR alarm FREE PHC 2 Free terminals threshold for raising non urgent _NUG_RSE alarm FREE_PHC 2 Free terminals threshold for clearing urgent alarm _UG_CLR FREE_PHC 2 Free terminals threshold for raising urgent alarm _UG_RSE BLKRES 1500 Time within which remote exchange replies back MNTBLK 1500 Maximum Time for maintenance circuits to get unblocked Notes 1 All timeout values are in milliseconds 2 The index refers to the serial number of the parameter in the help of the MOD SYS PARAM command For example in order to specify NT24 simply its index value 215 can be given in the command USER S MANUAL 207 System Practices COMMENTS c DOT The following comments pertain to Document Name o O CSP Section 11 Issue Draft DIDIDID No Month Year COMMENTS Use a separate sheet if required Please mail your comments to Your Reference Centre for Development of Telematics Name Attn Mr Y K Pandey Director Systems Company Address 39 Main Pusa Road New Delhi 110 005 Tel 91 11 5740374 Fax 491 11 5756378
69. REMOTE T BLOCKING STATUS AS BLOCKED Y i REASON DEST NOT ACCESIBLED Par CHECKN THE REASONN OF VOICECKT N REASON RST ACK AWT a AS ANY SIGNALLING N BEING S7BSY BY DISPL BLK7 STS N COMMAND 5 U hr d REASON NO ETE WITH HEIGHER MODULE IN THIS CASE ACKNOWLEDGEMENT TO GROUT RESET MESSAGE FOR VOICE CKTS IS NOT RECEIVED FROM OTHER END FOR RESETING VOICE CKT SEND A CIRCUIT RESET FOR THE AFFECTED TRUNK BY COMMAND MOD BLK7 STS ACTION RESET TEN AFFECTED VOICE CKT P LINK FOR NS NO lt THEVOICECKT 2 NC ACTIVATED amp L N AVAILABLE RESTORE ETE BETWEEN SUM d AND 7 TRUNK BM Z YES CHECK THRESHOLD POSITION NO 7 AND INT CHANGE IF REQUIRED ACTIVATE AT LEAST ONE SIGNALLING LINK GIVE A SOFT START TO SU AND THE BM CONTAINING THE TRUNKS IF PHCs ARE ALREADY INSERVICE THEN CHECK IF THE IFC TSC TIC PATH FOR TRUNK BM IS IF IT IS OK GIVE A SOFT START TO THE PARTICULAR TRUNK BM NO YES UNBLOCK THE VOICE ASK THE OTHER CIRCUITS USING EXCH PERSONNEL VICE AND TRI TO UNBLOCK VOICE COMMAND CIRCUITS AT MOD BLK7 STS HIS END FIG 11 1 CORRECTIVE ACTIONS FOR VOICE CIRCUITS RESTORATION Fall AS Z ARE THE VOICE lt CKT INS FREE 4 NO STILL THE SAME REASON FOR CKT BEING S7BSY ASK THE OTHER EXCHANGE TO BLOCK AND UNBLOCK THE VOICE CKT AT THEIR END
70. RM 124 7 7 7 7 7 7 7 DISPLAY THE BLOCKING STATUS NO7 TRUNKS REPORT LOCAL BLK STS NOT BLOCKED NOT BLOCKED NOT BLOCKED NOT BLOCKED NOT BLOCKED NOT BLOCKED NOT BLOCKED RMT BLK STS NOT BLOCKED NOT BLOCKED NOT BLOCKED NOT BLOCKED NOT BLOCKED NOT BLOCKED NOT BLOCKED BLK REASON NOT APPLICABLE CKT IS DATALINK NOT APPLICABLE NOT APPLICABLE NOT APPLICABLE NOT APPLICABLE NOT APPLICABLE INS FRC INS FRC INS FRC INS FRC INS FRC INS FRC INS FR MTCS STS C DOT CCS7 OPERATOR COMMAND SHEETS 7 6 EXISTING COMMANDS MODIFIED FOR CCS7 7 6 1 Create Trunk Group MAINTENANCE COMMAND Create Trunk Group MNEMONIC CRE TGP CLASS MENU POSITION 1 3 1 Update GENERAL INFORMATION COMMAND Create a Trunk Group MNEMONIC CRE TGP FUNCTION To create a trunk group with the desired characteristics PARAMETERS TGP NUM TGP NAME TGP STA LIN SIG REQUIRED REG SIG MF SIG CGS NUM CGS NAME IRNK DGTI TRK PRI PFX DGT PAD LEV TGP TYP TGP FCY DGT SZFD IRNG DWNI DIAL TN AC STA AC INFO TGP CAT HNT TYP SIG INF ICONT CHKI ECHO SUP SAT IND TEN TEN NO7 REMARKS TGPs using signalling are characterised by the circuit group set CGS to which they belong Also the NO7 TEN has an additional PCM number sub field which when combined with conventional TEN gives CIC Circuit Identification Code i e the trunk circuit on which call is being r
71. SER S MANUAL Chapter 8 SAl ZSOO WN ZSOO NSISAC HOVIA UU Xog Y31114 SIVNDIS HO NOLLOINNODHIINI 9 8 Dla M3IA HV3H 89r 009 150 005 150 HDNOWL H3AO WOH4 NSW GND DIQ ASv C DOT CCS7 166 SUM PACKAGING amp INTERCONNECTIONS IN8I ZSDOWR ZSOOWSIS3QV 51 H3MOd GHVOA YAHLOW N33AML38 NOILLO3NNOOHZAANI L9 Dla JHYdS 0114 0LSHO OL 814 guvds 00SHO 6 3dvdS 614 8 guvds 00qN9 7 vr er olxny 9 T 00xnv OW LLHMd LN 0LHMd 9W VIN LOHMd SN EN HOIO3NNOO HOLOSNNOO ONH3MHVW NOLLVNILS3Q 3OHNOS MalA HV3H LOW H 8Z NSO OdV 3uvds xm 814 0114 Sus 3uvds Hi M 3 E E 3 E e 00 d OIxnv i a 5 5 en sn AW T ama 3uvds S er 3uvds 167 USER S MANUAL 9 1 9 2 168 Chapter 9 SUM Retrofit Procedure INTRODUCTION As pointed out in Chapter 1 only one SUM can be equipped in the switch in any TU position in any of the co located BMs The SUM shoul
72. SET C TOWARDS SPD POINT CODE C CGS D OPC C DPC D TGP D PHYSICAL PCM CIRCUITS FOR SIGNALLING LSB D LS D SERVED PC OF SCP D DATA LNK TIME SLOTS FOR SIGNALING SRS D DPC POINT CODE OF SCP D HI RTBL LINK SET C SSN LST SCMG amp INAP USER S MANUAL 205 Annexure 57 Related System Parameters The system parameters are very important parameters from exchange performance and compatibility point of view These should not normally be changed by the users Please consult C DOT technical staff before attempting to modify these parameters Use DISPL SYS PARAM command to display the values of these parameters The index refers to the parameter sequence number in the command help SYMBOL INDEX VALUE MEANING ms NTO1 193 800 Rerouting timeout to avoid mis sequencing during changeover NTO2 194 1400 Changeover acknowledgment timeout NT03 195 800 Time controlled diversion to avoid mis sequencing during changeback NT04 Changeback acknowledgment timeout 1 NT05 Changeback acknowledgment timeout 2 sequencing NT NTI2 TIS NT16 NTI NT11 60000 Transfer restricted timer 206 C DOT CCS7 57 RELATED SYSTEM PARAMETERS SYMBOL INDEX VALUE MEANING ms NTs 209 NTI 210 m NIS 212 213 NT23 24 NT24 ns 500 NUIST 216 NLTST_PRD 2 60000 Interval timer for sending signalling link test message SLTM FREE_THR Threshold of free
73. SUBS RESN MSN IN Subfield 4 ADR Numeric range 9999 9999 9999 9999 9999 None Global title is used for SCCP addressing GT specifies the Translation Type i e T TYPE the Numbering Plan being used after translation NUM PLAN and the Nature of address indicator ADR adress indicates the remote DPC address to which the SCCP messages will be routed if routing indicator is SSN 6 2 11 HI RTBL High Priority Route Table PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS High Priority Route Table HI RTBL 2 Numeric 1 to 64 Set allowed None Essential parameter In a signalling routset the set of high priority routes 6 2 12 LM METHOD Link Management Method PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS USER S MANUAL Link Management Method LM METHOD 9 ASCII string 1 LM BASIC 2 LM SECOND 3 LM THIRD None Essential Parameter Generally LM BASIC method is used 45 Chapter 6 6 2 13 LO RTBL Low Priority Route Table PARAMETER NAME Low Priority Route Table MNEMONIC LO RTBL TYPE 2 Numeric POSSIBLE VALUES 1 to 64 Set allowed DEFAULT VALUE None Essential Parameter REMARKS In a signalling route set the set of low priority routes These routes will be selected if the high priority routes are unavailable 6 2 14 LOG LNK Logical Link PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS Logical Li
74. TE STATUS LINKSET ACTIVATION SUCCESSFUL 114 C DOT CCS7 OPERATOR COMMAND SHEETS 7 4 3 Modify Link Status MAINTENANCE COMMAND Modify Link Status MNEMONIC MOD LNK STS CLASS MENU POSITION 2 12 3 Update GENERAL INFORMATION COMMAND Modify Link Status MNEMONIC MOD LNK STS FUNCTION change the status of a specific link in the linkset PARAMETERS LSB NUM LOG LNK ACTION REQUIRED REMARKS This command is used when the status of only one link is to be changed in the LS The action types are the same as in MOD LS STS USER S MANUAL 115 Chapter 7 MOD LNK STS PARAMETER ENTRY FORM MOD LNK STS MODIFY LINK STATUS LSB NUM 1 LOG LNK 0 4 INHIBIT MOD LNK STS OUTPUT FORM 116 MODIFY LINK STATUS REPORT LSB NUM 1 LOG LINK ID 0 ACTION INHIBIT STATUS LINK INHIBITION SUCCESSFUL C DOT CCS7 OPERATOR COMMAND SHEETS 7 4 4 Modify Block 7 Status MAINTENANCE COMMAND Modify Block 7 Status MNEMONIC MOD BLK7 STS CLASS MENU POSITION 2 12 4 Update GENERAL INFORMATION COMMAND Modify Block 7 Status MNEMONIC MOD BLK7 STS FUNCTION This command is used to block unblock or reset one or more CCS 7 trunks PARAMETERS BLK TYP TEN REQUIRED REMARKS The response only indicates that the request for the action to be taken i e block unblock or reset has been sent The success of the action can be confirmed by giving DISPL BLK7 STS command
75. ULT VALUE REMARKS STP Users STP USER 5 Numeric 0 to 214 1 i e 0 to 16383 Set allowed 65535 i e no user has been defined It is the set of signalling transfer points STPs which are served by a LSB 6 2 37 T1 L2 H2 T3 N4 E4 T5 T6 T7 Level 2 Timers PARAMETER NAME Level 2 Timers MNEMONIC T1 L2 H2 T3 N4 E4 T5 T6 T7 TYPE Numeric POSSIBLE VALUES T1 400 to 500 L2 50 to 500 H2 700 to 1500 10 to 15 75 to 95 Ed 4 to 6 T5 80 to 120 T6 30 to 60 T7 5 to 20 DEFAULT VALUE T1 L2 H2 450 450 800 T3 N4 E4 13 82 5 T5 T6 T7 10 50 15 REMARKS Level 2 timers are adjusted if required by these parameters 6 2 38 TEN NO7 Number 7 Terminal Equipment Number PARAMETER NAME No 7 Terminal Equipment Number MNEMONIC TEN No7 TYPE Numeric string with six subfields separator character Type is B R F S P C B BM No 2 numeric range 1 to 32 Rack No 1 numeric range 1 to 3 Frame No 1 numeric range 1 to 6 S Slot No 2 numeric range 1 to 26 P PCM No 3 numeric range 1 to 128 Circuit No 2 numeric range 1 to 32 POSSIBLE VALUES 1 1 1 1 1 1 to 32 3 6 26 128 32 Range and set of values allowed DEFAULT VALUE NONE i e no TEN is specified REMARKS The TEN specifies the physical identity of the circuit number in a 54 CCS7 trunk group These can be upto 128 circuits in a CCS7 trunk group There is one to one correspondence between CCS7 trunk group TENs and Circuit Identification Codes
76. USER S MANUAL 37 Chapter 5 id and error dictionary reference Let us assume that parameter validation was successful 6 Since the command has been executed successfully CRP will display output results in the form of Output Forms which may occupy one or more VDU screen and or printer pages The results will be sent to VDU printer or both depending upon the option already chosen by the operator via CHG OUT DEV command Class 31 Number 7 Administration Update Commands S No Command Command Name Position Defined Parameters Mnemonic 1 CRE SRS Create a Signalling Relation SRS NUM DPC HI RTBL LO RTBL SSN LST 2 MOD SRS CHAR Modify a Signalling Route SRS NUM HI RTBL LO RTBL Set SSN LST DEL SRS Delete Signalling Route Set SRS NUM 4 CRE SPC Create Signal Point Code for ISIG NWI SPC LST Exchange 5 DEL SPC Delete SPC For This SIG NW SPC LST Exchange Create a Link Set LS NUM LSB NUM MNAC LN MXAV LN MNAV LN EC OPTN IMXMS RBI IMXOC RBI PC LST LOG LNK IDAT LNKI DEL LS Delete Link Set LS NUM CRE CGS Create Circuit Group Set CGS NUM CGS NAME SELF PC For This Exchange DEST PC SIG NW USR PART DEL CGS Delete Circuit Group Set ICGS NUMI CGS NAME DEL LSB Delete Link Set Bundle LSB NUM MOD LSB CHAR Modify Link Set Bundle LSB NUM STP USER Characteristics DEST PCS ADD DEL LNK Add or Delete Link LS NUM OPR TYP LOG LNK DAT LNK MOD LS CHAR Modify Link Set LS NUM M
77. VALUES 1 to 64 Range or set not allowed DEFAULT VALUE None Essential parameter REMARKS The identification of trunk group s which are served by common signalling links CGS represents the identity of voice circuits in the CCS7 network and does the association between the voice and signalling networks 6 2 5 CRG BND Charge Band PARAMETER NAME Charge Band MNEMONIC CRG BND TYPE 3 Numeric POSSIBLE VALUES 0 to 255 DEFAULT VALUE None when it is an essential parameter and All when it is not essential REMARKS Charge Band is associated with a charge rate number according to which 57 calls will be charged Charge band will be used for charging only if such charging method is defined in the CCS7 trunk group 6 2 6 DAT LNK Data Link PARAMETER NAME Data Link MNEMONIC DAT LNK TYPE Numeric string with 5 subfields separated by Format is B R F S C The description of fields is same as for TEN given in section 3 2 8 But here PCM number D is not used POSSIBLE VALUES 1 1 1 1 1 to 32 3 6 26 32 Set allowed DEFAULT VALUE None Essential parameter REMARKS Signalling data link identifies the channel on the digital transmission USER S MANUAL medium which is to be used as the signalling data link The data link chosen should be the same by both the ends of the link 43 Chapter 6 6 2 7 DEST PC DEST PCS Destination Point Code s PARAMETER NAME Destination Point Code s MNEMONIC DEST PC DEST PCS TYPE
78. W NAI New Nature of Address Indicator PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS New NAI after GT translation New NAI ASCII or Numeric NONE SUBS RESN MSN IN NONE This specifies the new NAI after GT translation 6 2 26 NUM FLAG Number of Flags between signalling units PARAMETER NAME Number of flags between signalling units MNEMONIC NUM FLAG TYPE Number 0 to 15 DEFAULT VALUE 0 REMARKS This field is used to increase or decrease the number of flags between two signalling units of CCS7 message 6 2 27 OPR TYP Operation Type PARAMETER NAME Operation Type MNEMONIC OPR TYP TYPE 3 ASCII POSSIBLE VALUES 1 ADD 2 DEL DEFAULT VALUE None Essential Parameter REMARKS In ADD DEL LNK command the operation type Choose ADD if a 50 link is to be added to a linkset and DEL if is to be deleted C DOT CCS7 PARAMETERS DESCRIPTION 6 2 28 PC LST Point Codes List PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS Point Codes List PC LST 5 Numeric 0 to 16383 Set allowed None Essential parameter It is the list of point codes for which signalling messages are carried by a signalling link set 6 2 29 PC NUM Point Code Numbers PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS Point Code Numbers PC NUM 5 Numeric 0 to 16383 Set allowed None Essential parameter Used for specifying the set of point codes i
79. alling and traffic follow the same path within the exchange This is known as Channel Associated Signalling CAS In this case the signalling and traffic also follow the same path external to the exchange i e on the transmission link The next stage through which the exchanges evolved is shown in Fig 1 1 In such exchange the control mechanism for setting up and releasing calls is separated from the switch block The technique allows much more flexibility in controlling calls and it also reduces costs Again CAS systems are typically associated with this type of exchange Whereas signalling information is carried on the same path as its associated speech circuit external to the exchange the two are separated within the exchange This is shown in Fig 1 1 in which the speech traffic circuits denoted by solid lines are routed by the switch block but the signalling information denoted by dotted lines is routed via the control function Between Exchanges A and B the signalling and traffic are carried over the same path This approach was primarily designed to allow optimisation of functions within exchanges but its effectiveness is constrained by the need to combine signalling and speech traffic external to the exchange With Common Channel Signalling CCS systems the philosophy is to separate the signalling path from the speech path The separation occurs both within the exchange and external to the exchange Fig 1 2 thus allowing optimisati
80. are available in classes 40 amp 41 respectively COMMANDS DIRECTORY Command directory serves the function of a central reference point for all the commands By looking at the various entries in the directory the operating personnel get an idea of the function performed by a command its mnemonic and the position defined parameters required for its execution The directory is divided into four parts corresponding to the four CCS7 command classes and two addition classes which contain ISUP charging related commands Please note that through all the commands and their parameters have been described in Chapter 5 amp 6 all the commands may not be available in a particular software release C DOT CCS7 COMMAND DIRECTORY 5 3 COMMAND FLOW Irrespective of the command all the commands when executed follow a similar pattern of man machine interaction Command flow is the interaction between the operating personnel man and the software more specifically the Command Recognition Process CRP machine As an illustration the command flow for Create Circuit Group Set CRE CGS command is given in the following paras if At the CRP prompt gt either give the command CRE CGS or the menu path for this command i e 1 Administration Main Menu 31 Number 7 Update Commands 8 Create Circuit Group Set The path will be specified by typing MENU 1 31 8 Yet another method would be to traverse the menus and choose the appropriat
81. art specified in recommendation Q 795 For detailed specifications Blue Books 1998 of ITU T 57 and subsequent White Book enhancements can be referred There are certain areas on which ITU T has left the specification to be framed by the individual countries Department of Telecommunications DOT the nodal regulating agency of telephony in India has specified the implementation of CCS7 in Indian telephone network It consists of the specifications which are applicable in the national network and specific recommendations for areas left open by ITU T as well as certain basic services applicable in the Indian context Some of these are e National Common Channel Signalling Plan 23 330 91 TEC September 1992 e National CCS7 Specifications for Local Tandem Exchanges G CCS 01 02 SEP 96 e National CCS7 Specifications for Transit Exchanges G CCS 02 02 SEP 96 e National STP Standards SP STP 001 September 1994 e National Standards for Large Digital Switching Systems G CCS 03 01 JUN 94 In the implementation of CCS7 in C DOT DSS MAX the relevant portions of above mentioned specifications have been used USER S MANUAL 17 2 1 18 Chapter 2 57 Capability in C DOT 055 MAX OVERVIEW OF C DOT DSS MAX ARCHITECTURE C DOT DSS MAX family of exchanges employ T S T switching architecture and can be configured by using the following four basic modules Figure 2 1 a Base Mod
82. available on the parameter entry form for every parameter Typing lt h gt and CR Carriage Return will display the help available for that parameter The parameter value can then be chosen by selecting the appropriate parameter mnemonic or simple keying in the serial number of the mnemonic in the online help e Non essential i e optional parameters are enclosed in square brackets whereas essential i e mandatory parameters are not The system will assume DEFAULT VALUE values of the non essential parameters if no value is entered by the operator i e just CR is pressed DEFAULT VALUES of the non essential parameters are already displayed on the parameter entry form error message is displayed in case an illegal value is entered for parameter The operator may seek on line help in such a situation e Output forms and parameter entry form for each command have a predefined structure Modify commands are not accepted by the system when the is not in inservice level On the following pages general information parameter entry form and output forms for each command are given The description of the parameters required for all the commands have already been given in Chapter 3 USER S MANUAL 57 Chapter 7 7 2 CCS7 ADMINISTRATION COMMANDS UPDATE CLASS 7 2 1 Create Signalling Relation ADMINISTRATION COMMAND Create Signalling Relation MNEMONIC CRE SRS CLASS MENU POSITION 1 3
83. be same for the particular PCM otherwise the voice circuits will be blocked Rest of the parameters are given default values Also see the notes at the end for a discussion of important TGP related parameters 4 CRE LSB Create Link Set Bundle LSB NUM 1 Link set bundle number ICGS NUMI 1 CGS number CGS NAME NONE CGS name STP USER NONE Signaling Transfer Point user None since the exchange is not a STP DEST PCS NONE Destination point codes None same reason as above LM MTHD BASIC Link management method BASIC For a LSB once the LM method is defined then all the link sets will have the same method MX MSGSZ DATA272 Maximum MSU size 272 octets 5 CRE LS Create Link Set LS NUM 1 Link set number LSB NUM 1 LSB number in which this LS will exist MNAC LN 2 Minimum active Links threshold for alarm MXAV LN 2 Maximum available links thresholds for alarm MNAV LN 2 Minimum available links threshold for alarm PC LST 1001 Point code of the destination EC OPTN BASIC Error correction option Basic USER S MANUAL 197 Annexure I 198 MXMS RB 127 Maximum no of MSUs in retransmission buffer MX OCTET RTB 4095 Maximum no of octets in retransmission buffer LOG LNK 0 amp 1 Logical link identity in the LS The logical link ids should be same for the corresponding time slot at the remote end also DAT LNK X X X X 16 amp X X X X 17 TE
84. being used in the outgoing route should have a Band number attached to it For the route calls this band number will be sent back to local exchange Charge band is to be used only when the full link between local exchange and TAX supports CCS7 ISUP CRG CHU This method of charging is just like charging in case of MF trunks using charging pulses For each unit to be charged here a charge message is sent by TAX to local exchange In this case association of charge C DOT CCS7 CCS7 DATA CREATION FOR PSTN ISDN APPLICATION band with charge rate number will not make any difference According to the charge rate on outgoing route TAX will generate periodic charge message and local exchange will do the charging accordingly ACCS CD NPFX Access Code Not Prefixed This parameter is used for access code suppression in case of STD ISD calls in out going trunks It also sets the NATURE OF ADDRESS for called party as National Significant or International number This parameter setting will be required for other technology exchange like EWSD who follow E 163 amp 164 book the type of nature of address handling implementation If this parameter is not set then calls will repeatedly fail with CDR showing the reason as ADDRESS INCOMPLETE So while creating CCS7 trunk please ensure nature of address at other end If this parameter is not set then 0 00 will be sent to remote end with nature of address for called subscriber as National Significant Inter
85. below Power On This will occur when the power to Administrative Processor APC Base Processor BP or SUM is switched on In this case the SUM CPU 507 will go for power on tests After these tests pass it will try to communicate with the copy to find out whether it is active or not If no reply comes from the copy it tries to become active by acquiring the memories If the 507 is able to contact at least one memory BME it will become active with that memory Then it undergoes all the steps from c through h Code Load This level is triggered by software recovery or by operator Level 0 command In this case all the steps from c to h are executed Patch Init This level is triggered by operator command only In this case Level 1 all the steps from d to h are executed Part Init This level is triggered by software recovery or by operator Level 2 command In this case all the steps from e to h are executed Stable Clear This level is triggered by software recovery or by operator Level 3 command In this case all the steps f to h are executed Soft Start This level is triggered by software recovery or by operator Level 4 command In this case only the steps i amp h are executed In all the above levels of initialization all the calls which were in progress will be terminated 10 2 1 Sequence of System Initialisation The system initialization sequence is as follows AM gt CM gt BMs gt SUM 10 2
86. call without affecting the calling and called subscribers CCS systems transfer signals very quickly i e at 64 Kbps This speedy signalling also permits the inclusion of far more information without an increase in post dialling delay USER S MANUAL 9 Chapter 1 1 5 10 Techniques used modern CCS system can further improve the flexibility provided to customers User to user signalling and end to end signalling techniques are used whereby messages can be transferred from one customer to another without undergoing a full analysis at each exchange in the network Whilst forms of end to end signalling are possible using CAS systems the technique can be more efficiently implemented with CCS systems One of the problems that prompted the development of CCS systems was speech clipping in the international network In some CAS systems it is necessary to split the speech path during call set up to avoid tones being heard by the calling customer This results in a slow return of the answer signal and if the called customer starts speaking immediately after answer then the first part of the statement by the called customer is lost As the first statement is usually the identity of the called customer this causes a great deal of confusion and inconvenience CCS systems avoid the problem by transferring the answer signal quickly As a result of the processing ability of CCS systems a high degree of reliability can be design
87. cussion in subsequent sections is based upon this information ISUP TERMINATING CALL Setup Phase When an ISUP call originates on an ISUP trunk the Status Control Process SCP checks the busy free status of the trunk circuit i e CIC If the circuit is free an incoming trunk terminal process ICUP Incoming ISDN User Part is created for handling the ISUP protocol Once this process is created the SCP forwards the Initial Address Message IAM received from preceding exchange to it ICUP extracts the called party number from IAM and performs preliminary digit analysis i e whether the call is terminating in the same exchange or it has to be transited When the call is terminating in the exchange it collects all the digits of the called party and goes for routing of the call in order to determine the destination of the call For the transit case refer to the next section USER S MANUAL 31 Chapter 4 SI ZSOO WN ZSOO NSISAC AONANOAS JDVSSJA TIVO Lv 111588592905 SNOILIGNOO 3SVSS3N 5 3NO1 GNVSNI 39IOA ON SNOILO341Q JHL H LO8 NI HLVd 39IOA NOILLO3HIG GHVMHOV8 NI HONOYHL HLVd 39IOA gt 56 Lv lt ALHVd a gt gt S gt M SNITIVO A8 Q3uv310 TIVO VS soon No 54 gt
88. d not be equipped in a remote BM RSU In the SUM max 4 or 8 SHM cards can be equipped each catering to 8 terminals Thus a maximum of 32 or 64 time slots out of 128 channels on the 8 Mbps link between SUM and TSC are consumed by the SUM The remaining time slots of the terminal group can be utilized for equipping analog or digital terminations using a separate frame in the concentration TU positions Conversely if SUM is equipped in a concentration frame position it requires 8x free time slots where x no of SHM cards equipped in that terminal group More information on utilization of free time slots can be found in section 9 4 SUM RETROFIT PROCEDURE The data required for equipage of the SUM in C DOT DSS is different from the data for an ordinary TU frame Since only one SUM can be equipped in the exchange the validation of the data is done in a different way The information that the SUM is equipped BMx referred to as the BM should also be available at the Central Module CM processor complexes SSC and APO Normally such data is not available at APC or SSC for the frames Thus handling of SUM equipage is different from the equipage of a TU frame However like in the case of equipping of TUs the SUM can also be equipped in concentration with an ATU or DTU When SU is in concentration with DTU total no of trunks equipped in DTU and PHC terminals in 7SU together should not exceed 126 Data creation
89. dependent of the switch configuration The BM containing the SUM is then called the home BM Figure 2 2 depicts the placement of SUM in C DOT DSS MAX SUM contains a 68010 or 68040 based generic CPU complex and CCS7 signalling handler terminals The number of signalling terminals depends upon the signalling network connectivity and the amount of signalling traffic to be carried C DOT CCS7 CCS7 CAPABILITY IN C DOT DSS LEGEND NOTE HOME BASE MODULE BMx CENTRAL MODULE CM Z DTU SUBSCRIBER TIME SWITCHING LINES Z OF SIGNALLING SUM lt INFO TU Ps lt TIME SWITCHING N E OF VOICE t INFO NN TU f N 14 N N TSC N NN N ANALOG NN BOK RRR IRR OK TRUNKS 2 BASE PROCESSOR 20 0 N b 5 SWITCHING DIGITAL TRUNKS SIGNALLING LINKS DTU N 7 N DIGITAL LINKS TU FROM RSUs TS y TU TU TSC BASE PROCESSOR SSC BASE MODULE AM TERMINAL INTERFACE CONTROLLER APC GENERIC CPU COMPLEX SIGNALLING INFORMATION IOM VOICE INFORMATION DEVICES IOP SERVICE CIRCUITS INTERFACES ARE NOT SHOWN FIG 2 2 SUM IN C DOT DSS MAX DESIGN CCS7 UM CCS7 SC USER S MANUAL 21 Chapter 2 22 The 57 protocol stack has been implemented according to ITU T Recommendations and Indian National Standards Message Transfer Part MTP
90. e high priority linkset as that between STP1 and STP 2 In the SRS having DPC as that of SSP Sub System Number SSN list will have SCMG amp INAP Rest of the parameters are to be filled in the same way as described in the chapter 8 of this document This finishes SS7 network data creation for MTP amp SCCP layers at the STP Data between STP and SCP 1 Create SS7 network data up to link set by following the procedure given in the chapter 8 of this document 2 Create Signalling Route Set CRE SRS The SRS having DPC as that of SCP Sub System Number SSN list will have SCMG amp INAP Rest of the parameters are to be filled in the same way as described in the document Chapter 8 of this document 3 IF SCP is sending GT in the calling party number then Create a Remote GT towards SSP by using CRE GT command with the following parameters if SCP is doing the routing towards SSP on DPCSSN then the remote GT need not be created Gr Typel1 ISDN SUBS Point Code of SSP used as GT address gt PC lt Point Code of SSP gt SSN INAP RTINGIND DPCSSN Rest of the parameters are to be given default values This finishes 557 network data creation for MTP amp SCCP layers at the SSP The data created is depicted in diagram below USER S MANUAL 203 Annexure II DATA FOR SS7 NETWORK WHEN STP s ARE INVOLVED C DOT SBM SSP POINT CODE A POINT CODE CGS A OPC A DPC B TGP A PHYSICAL PCM CIRCUITS FOR SIGNA
91. e option In any case let us assume that the command has been correctly issued Security Checks are performed by CRP i e whether the operator has the authority to issue this command This authority is granted to an operator while adding a new operator via ADD OPR command Parameter Entry Form is displayed if security check has been passed The form contains The command mnemonic command name and all the position defined parameters required for executing the command Non essential parameters i e to which a default value is attached are shown enclosed in square brackets while essential parameters without brackets For example in this case all the parameters except SIG NW and USR PART are essential mandatory parameter User enters parameter values as desired Error messages will be displayed for illegal entries Online Help is available for each parameter and can be accessed by typing h and CR Carriage Return while the cursor is at the desired parameter Option to Repeat Terminate Execute R T E the command with the given input parameters will now be displayed User enters the Execute i e option The system will respond by displaying the message Executing Now the Command Execution Process CEP validates the parameters entered If CEP detects any error the command is rejected and CRP displays an error message The error message contains error number error statement entity
92. ed either as incoming or outgoing for any other signalling scheme for CCS7 also the two types of characteristics are handled by two terminal processes TPs Incoming Terminal Process ITP7 and ICUP for ISUP e Outgoing Terminal Process OTP7 and for ISUP The basic feature of the C DOT DSS architecture is its capability to interwork with different signalling schemes On one end there may be one signalling scheme in the network while on the other end signalling type may be altogether different CMR process facilitates the interworking of different signalling schemes For CCS7 problem of interworking arises when on one side of the network there is CCS7 and the other end is some other Signalling process translates the message received from the CCS7 TP and communicates the event to other TP in a form that is understandable to it Also communication received from the non CCS7 TP is communicated to CCS7 TP in the format relevant to it Maintenance Subsystem Maintenance subsystem is spread over SU7 and the central processors of the home BM and the CM Together these take care of the overall configuration management maintenance of SUM and the nailed up paths and the management of datalinks to be used for setting up signalling links The ITU T Recommendations for MTP level 3 assumes some management functions which are implementation dependent In this implementation these functions are distributed
93. ed into the signalling network Error detection and correction techniques can be applied which ensure reliable transfer of uncorrupted information In the case of an intermediate exchange failure re routing can take place within the signalling network enabling signalling transfer to be continued While these features introduce extra requirements the common channel approach to signalling allows a high degree of reliability to be implemented economically A major restriction of CAS is the lack of flexibility e g the ability to add new features is limited One factor that led to the development of CCS was the increasing need to add new features and respond to new network requirements Responses to new requirements in CCS can be far more rapid and comprehensive than for channel associated versions CCS systems are not just designed to meet current needs They are designed to be as flexible as possible in meeting future requirements One way of achieving the objective is to define modern CCS systems in a structured way specifying the signalling system in a number of tiers The result is flexible signalling system that reacts quickly to evolving requirements and future services can be incorporated in a flexible and comprehensive manner Changes to existing services can be implemented more quickly and at lower cost than with CAS systems OVERVIEW OF SIGNALLING SYSTEM NO 7 Signalling System No 7 CCS7 is a message based signalling system between Sto
94. er CAS systems and the features and capabilities of 57 are briefly described The international standards and other references followed in the design of 57 are also listed Chapter 2 presents a brief on the system architecture of C DOT DSS MAX and the place of the CCS7 Signalling Unit Module SUM in the overall switch architecture The overall architecture of SUM 15 also described here Chapter 3 is on the hardware and software architecture of the SUM and the packaging of its hardware components Chapter 4 deals with CCS7 ISDN User Part call processing in C DOT DSS MAX Here the interaction between the hardware and software while handling different types of ISUP calls has been described In Chapters 5 6 amp 7 the man machine interface for carrying out operations and maintenance functions is described Chapter 8 covers the SUM packaging and interconnection aspects Chapter 9 10 amp 11 are on the retrofit procedure installation and maintenance procedures USER S MANUAL 5 Chapter 1 1 3 1 4 Finally in Chapter 12 engineering of the SUM resources is discussed OVERVIEW OF SIGNALLING SYSTEMS One of the major factors influencing the development of signalling systems is the relationship between signalling and the control function of exchanges Early telecommunication networks used analogue step by step exchanges In such systems the control and switch functions are co located and when a call is made the sign
95. ermed a signalling point The direct interconnection of two signalling points with CCS7 uses one or more signalling link s Level 1 of the 4 level structure shown in Fig 1 3 defines the physical electrical and functional characteristics of the signalling link Defining such characteristics within level 1 means that the rest of the signalling system level 2 to 4 can be independent of the transmission medium adopted By keeping the interface between levels 1 and 2 constant any changes within level 1 do not affect the higher levels In a digital environment usually the physical link is a 64 Kbps channel This is typically within a digital transmission system using pulse code modulation PCM However other types of link including analogue can be used without affecting levels 2 to 4 USER S MANUAL 11 Chapter 1 12 OSI MODEL APPLICATION PRESENTATION SESSION TRANSPORT CCS7 PROTOCOL MODEL ISUP TUP NETWORK MTP LEVEL 3 DATA LINK MTP LEVEL 2 PHYSICAL MTP LEVEL 1 ASE APPLICATION SERVICE ELEMENT ISUP ISDN USER PART MTP MESSAGE TRANSFER PART OPERATIONS MAINTENANCE AND ADMINISTRATION PART SCCP SIGNALING CONNECTION PART TRANSACTION CAPABILITIES APPLICATION PART TUP TELEPHONE USER PART FIG 1 3 CCS7 PROTOCOL ARCHITECTURE DESIGN CCS7 UM SS7 PA C DOT CCS7 INTRODUCTION Level 2 Level 2 defines t
96. essors are the early steps in establishing a cohesive CCS network to allow unimpeded signalling transfer between customers and nodes and between nodes in the network The concept of a cohesive CCS network opens up the opportunity for the implementation of a wide range of network management administrative operation and maintenance functions major example of such a function is the quasi associated mode of operation This mode of operation provides a great deal of flexibility in network security reduces the cost of CCS on small traffic routes and extends the data transfer capabilities for non circuit related signalling CAS systems possess limited information transfer capability due to i The restricted number of conditions that can be applied e g the limited variations that can be applied to a D C loop or the limited number of frequency combinations that can be implemented in a voice frequency system ii The limited number of opportunities to transfer signals e g it is not possible to transmit voice frequency signals during the conversation phase of a call without inconveniencing the customers or taking special measures Neither of these restrictions applies to CCS The flexible message based approach allows a vast range of information to be defined and the information can be sent during any stage of a call Hence the repertoire of CCS is far greater than channel associated versions and messages can be transferred at any stage of a
97. frame position or in a separate cabinet d Complete all the physical connections of the SUM with the TSU as given in the previous chapter e Replace the four 2A filter boxes on the busbars by 4A 2mH filter boxes The standalone cabinet should be fitted with four filter boxes of 4A 2mH type Connect the power supply to the SUM frame from the filter boxes as shown f Check that the SUM jumper ID is 5E in copy0 in 1 on the frame as shown there are 8 Jumpers each on both copies for this 750 0 780 1 WI close WIS W2 open W14 W15 W4 W16 W5 W17 WB W18 WT WIS USER S MANUAL 169 Chapter 9 170 W8 W20 The TUC jumper setting will be according to the position where the 7SU is put Principal TU 1st Conc TU 2nd Conc TU 3rd Conc TU W10 amp W12 zz The TUI jumper setting will be as per the position of the SUM Note If the SUM is not being equipped for the first time the above steps should be skipped Equip the SUM frame using the command EQUIP FRAME with the following parameters MOD NO BM number RACK NO 1 2 3 1 2 3 4 5 6 depending on the frame to be equipped TIC ID ID of the frame to be equipped e g 09 0 1 or 10 0 1 etc FRM TYPE SU This command will do the following Check if the home BM is equipped Check if the corresponding f
98. g the link is inhibited After inhibition a test pattern is sent to the remote end on the link to be tested The other end of the link echoes back the pattern The sent and received patterns are matched In case of mismatch the link test is deemed to have failed else successful After the test the inhibited link is uninhibited USER S MANUAL 111 Chapter 7 TST SGNL LNK PARAMETER ENTRY FORM TEST SGNL LNK TEST SIGNAL LINK LSB NUM LOG LNK TST SGNL LNK OUTPUT FORM SIGNALLING LINK TEST REPORT LSB NUM 1 LSB LINK ID 1 STATUS LINK TEST PASSES 112 C DOT CCS7 OPERATOR COMMAND SHEETS 7 4 2 Modify Link Set Status MAINTENANCE COMMAND Modify Link Set Status MNEMONIC MOD LS STS CLASS MENU POSITION 2 12 2 Update GENERAL INFORMATION COMMAND Modify Linkset Status MNEMONIC MOD LS STS FUNCTION To change the status of the linkset PARAMETERS LS NUM ACTION REQUIRED REMARKS When activation is done for the first time no of links equal to the MN ACT LN threshold in the linkset will be activated Deactivation of the linkset deactivates the least priority link within the linkset The action can also be inhibit uninhibit block and unblock USER S MANUAL 118 Chapter 7 MOD LS STS PARAMETER ENTRY FORM MOD LS STS MODIFY LINK SET STATUS LS NUM 1 ACTIVATE MOD LS STS OUTPUT FORM MODIFY LINKSET STATUS REPORT LS NUM ACTION ACTIVA
99. ge is generated and sent to the preceding exchange followed by ACM Conversation Phase When the called subscriber answers the call ANM received from the succeeding exchange is forwarded to the preceding exchange to notify the called party s condition to the calling subscriber Release Phase If the calling party releases the call then ICUP receives REL from the preceding exchange The cause of failure is recorded and RLC is sent to the preceding exchange To the succeeding exchange the REL message received is forwarded On getting RLC the call details are sent to the relevant administration process for post processing USER S MANUAL 35 5 1 5 2 36 Chapter 5 Command Directory INTRODUCTION Commands are the tools that can be used to observe record manipulate and display exchange data For the purpose of incorporating requirements specific to 57 implementation administration and maintenance commands have been added to the existing MML command set of C DOT DSS MAX CCS7 administration commands are grouped under two classes in the CRP Administration commands menu Class 31 Number 7 Update Commands Class 32 Number 7 Display Commands Similarly CCS7 maintenance commands are also grouped under the following two classes in the CRP Maintenance commands menu Class 12 Number 7 Maintenance Update Commands Class 13 Number 7 Maintenance Display Commands Additionally ISUP charging related update and display commands
100. he functions that are relevant to an individual signalling link including error control and link monitoring Thus level 2 is responsible for the reliable transfer of signalling information between two directly connected signalling points If errors occur during transmission of the signalling information it is the responsibility of level 2 to invoke procedures to correct the errors Such characteristics can be optimised without affecting the rest of the signalling system provided that the interfaces to levels 1 and 3 remain constant Level 3 The functions that are common to more than one signalling link i e signalling network functions are defined in level 3 these include message handling functions and signalling network management functions When message is transferred between two exchanges there are usually several routes that the message can take including via a signal transfer point The message handling functions are responsible for the routing of the messages through the signalling network to the correct exchange Signalling network management functions control the configuration of the signalling network These functions include network reconfigurations in response to status changes in the network For example if an exchange within the signalling network fails the level 3 of CCS7 can re route messages and avoid the exchange that has failed Message Transfer Part MTP Levels 1 to 3 constitute a transfer mechanism tha
101. ified switch unit PARAMETERS REQUIRED MOD NO UNIT ID REMARKS This command can be used to display the status of switch units of the Signalling Unit Module SUM USER S MANUAL 153 Chapter 7 DISPL SWU STATUS PARAMETER ENTRY FORM DISPL SWU STATUS DISPLAY SWITCH UNIT STATUS MOD NO UNIT ID SUM 507 0 0 0 DISPL SWU STATUS OUTPUT FORM MOD NO MOD SAT UNIT ID STATUS UNIT TYPE 154 SWITCH UNIT STATUS REPORT SUM INS ACT 507 0 0 0 5 C DOT CCS7 OPERATOR COMMAND SHEETS 7 6 12 Force Switch Unit Out of Service Inservice MAINTENANCE COMMAND Force Switch Unit Out of Service Inservice MNEMONIC FRC SWU OOS INS CLASS MENU POSITION 2 6 2 1 Update GENERAL INFORMATION COMMAND Force switch unit Out of Service or Inservice MNEMONIC FRC SWU OOS INS FUNCTION force the specified switch unit out of service or inservice PARAMETERS REQUIRED MOD NO UNIT ID REMARKS These commands can be used to change the status of SU7 0 1 and MU 0 1 units of SUM FRC SWU OOS INS PARAMETER ENTRY FORM FRC SWU OOS INS ADD TRUNKS TO A TRUNK GROUP MOD NO SUM UNIT ID SUT 1 USER S MANUAL 155 Chapter 7 FRC SWU OOS INS OUTPUT FORM PUT FORCE SWITCH UNIT OUT OF SERVICE MOD NO SUM UNIT ID 507 1 RESULT PASS NEW STATUS OOS OPR OLD STATUS INS FREE 156 C DOT CCS7 Chapter 8 SUM Packaging amp Interconnections 8 1 SUM PACKAGING The Signa
102. intenance GENERAL Initiatives to be taken by maintenance personnel in the best interest of the system s health are highlighted in this chapter Routine maintenance philosophy as applicable to the system as a whole is described first What needs to be done for the maintenance of switch hardware terminal hardware PSU cards and IOPs are covered later ROLE OF MAINTENANCE PERSONNEL Keeping a watch on the system s health trouble fixing and programming periodic routining strategy in advance form the major functions to be performed by the maintenance personnel In addition to above following functions also require human attention 1 Co ordination with remote exchanges for trunk testing and signalling link maintenance 2 Providing the necessary feedback to the support centre 3 Day to day logging of important observations and maintenance actions Some of the above functions are briefly described in the following paragraphs 11 2 1 Watch on System s Health 178 This involves ensuring periodic dump of desired information scanning reports generated by the system and verifying systems integrity with a view to uncover any abnormalities in system s behavior and being vigilant towards the audio visual alarms raised by the system Moreover when a new card is brought to service vigilance towards system s behavior is needed to uncover any malfunctions which can be attributed to the new card C DOT CCS7 ROUTINE MAINTENANCE
103. ion MNEMONIC DISPL LS CLASS MENU POSITION 1 32 3 Display GENERAL INFORMATION COMMAND Display Link Set MNEMONIC DISPL LS FUNCTION display the parameters of a linkset PARAMETERS LS NUM REQUIRED REMARKS The output report shows the following information on the specified LS a LSB number of which this LS is a member b Link threshold c Error correction option Basic or PCR d List of point codes served e Identity of constituent links USER S MANUAL 101 Chapter 7 DISPL LS PARAMETER ENTRY FORM DISPL LS DISPLAY LINK SET LS NUM i 1 DISPL LS OUTPUT FORM Link Set Number Link Set Number Maximum Active Links Minimum Active Links Maximum Available Links Minimum Available Links Error Correction Option Max MSU Rtb Max Octet Rtb Link Management Method Flags Between ISUS 5 T1 TL2 TH2 Timers T3 TN4 TE4 Timers T5 T6 T7 PCs served Logical Links Data links TEN REPORT FOR DISPL LS 1 1 3 3 3 1 BASIC 127 4095 BASIC 0 450 450 800 19 2 5 10 50 15 9998 0 1 2 7 1 3 17 16 4 159 17 17 7 1 9 17 18 Note These parameters are available only in release 1 5 x x 102 C DOT CCS7 OPERATOR COMMAND SHEETS 7 3 3 1 Display Circuit Group Set Information ADMINISTRATION COMMAND Display Circuit Group Set Information MNEMONIC DISPL CGS CLASS MENU POSITION 1 32 4 Display COMMAND Display Circuit Group Set
104. ist of STP users and or DPCs for a LSB PARAMETERS LSB NUM STP USER DEST PCS REQUIRED REMARKS By using this command only user changeable LSB parameters can be modified in a STP configuration USER S MANUAL 81 Chapter 7 MOD LSB CHAR PARAMETER ENTRY FORM MOD LSB CHAR MODIFY LINK SET BUNDLE CHARACTERISTICS LSB NUM 1 STP USER 9994 DEST PCS 9998 amp 9994 MOD LSB CHAR OUTPUT FORM MODIFY LINK SET BUNDLE REPORT Link Set Bundle Number 1 STP Users 9994 DEST PCs 9998 8 9994 82 C DOT CCS7 OPERATOR COMMAND SHEETS 7 2 13 Add or Delete Link ADMINISTRATION COMMAND Add or Delete Link MNEMONIC ADD DEL LNK CLASS MENU POSITION 1 31 13 Update GENERAL INFORMATION COMMAND Add or Delete Link MNEMONIC ADD DEL LNK FUNCTION The command is used to add or delete one or more links of a linkset between two exchanges PARAMETERS LS NUM OPR TVP LOG LNK DAT LNK REQUIRED REMARKS The TENs of links to be added or deleted should be out of service Use FRC TRM OOS command After ADD operation the newly created links TEN should be forced inservice Also add one to MNAC LN MXAV LN MNAV LN parameter in linkset by MOD LS CHAR command USER S MANUAL 83 Chapter 7 ADD DEL LNK PARAMETER ENTRY FORM ADD DEL LNK ADD OR DELETE LINK LS NUM OPR TYP LOG LNK DAT LNK REPORT FOR ADD DEL LNK Link Set Number Operator Type Data Links TEN Logical Link Id
105. lling Unit Module SUM frame houses the following type of cards The number of cards is indicated in the parentheses Signalling Handler Module SHM cards max 4 or 8 Base Memory Extender BME cards 2 duplicated Central Processor Unit 507 cards 2 duplicated Terminal Unit Controller TUC card 2 duplicated Terminal Unit Interface TUI card 2 duplicated Loader CUL Cards 2 Not required in case of HPC CPU Power Supply Unit PSU II cards 2 in each plane duplicated Mother Board split into three sections The motherboard is split into three sections The two side sections receive the PSU cards 2 each and the central section receives all the control cards and interface cards The arrangement of cards in the SUM frame is depicted in Fig 8 1 and listed in Table 8 1 below USER S MANUAL 157 Chapter 8 Table 8 1 SUM Equipage The two PSU II cards of a plane work is load sharing mode SHM cards are placed in plane 0 only in case of BPC CPU BM but the firmware is different TUI 0 TUC 1 BM but firmware is different SHM5 The two CUL cards are inserted in slots 18 amp 19 or CULI SHM 18 amp 20 only when the CPU is BPC In case of 6 HPC CPU another 4 SHM cards can be equipped CUL2 SHM in slots 17 to 20 in addition to the 4 cards in plane 7 0 CUL2 SHM 8 BME card is same as that used in BM blank The two PSU II cards of a plane work in load sharing mode 158 C DOT CCS7 SUM PACKAGING
106. n a given type of network NAT or INAT whose connectivity status to this node is to be interrogated 6 2 30 RTIND Routing Indicator PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS USER S MANUAL Routing Indicator RTIND ASCII or Numeric 1 DPCSSN 2 GT DPCSSN This parameter specifies the routing mechanism to be used by INAP or SCCP messages If Routing indicator is GT then GT translation will be used If DPCSSN is used then the routing will be done on the DPC amp SSN specified in the GT 51 Chapter 6 6 2 31 SELF PC Self Point Code PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS Self Point Code SELF PC 5 Numeric 0 to 214 1 i e 0 to 16383 Range or set not allowed None Essential parameter Refers to the particular point code of the node which is used for defining a particular signalling relation 6 2 32 SIG NW Signalling Network Identification PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS 52 Signalling Network Identification SIG NW 13 ASCII 1 NW INAT 2 NW INAT SPARE 9 NW NAT 4 NW NAT SPARE Range or set not allowed NW NAT It is a 2 bit code that indicates the signalling network to which the node belongs The network could be national NAT or international INAT Spare codes are provided to accommodate multiple national or international network By this approach the number of signalling point
107. n and maintenance commands are described in the format described above in section 3 1 USER S MANUAL 41 Chapter 6 6 2 1 ACTION PARAMETER NAME Action MNEMONIC ACTION TYPE 10 ASCII POSSIBLE VALUES 1 Activate 2 Deactivate 3 Block 4 Unblock 5 Inhibit 6 Uninhibit DEFAULT VALUE None Essential Parameter REMARKS In MOD LNK STS command this parameter is used to specify the action to be done on the link 6 2 2 BLK TYP Block Type PARAMETER NAME Block Type MNEMONIC BLK TYP TYPE 7 ASCII POSSIBLE VALUES 1 Block 2 Unblock 3 Reset Range or set not allowed DEFAULT VALUE None Essential Parameter REMARKS Type of blocking action to be done on the 7 CICs Reset option is used to send Reset Circuit RSC message for one or more CICs It is a useful option that is used specially when the distant node is not honoring Group Reset GRS message from the local node 6 2 3 CGS NAME Circuit Group Set Name PARAMETER NAME Circuit Group Set Name MNEMONIC CGS NAME TYPE 10 ASCII POSSIBLE VALUES Any ASCII string of maximum length 10 Range or set not allowed DEFAULT VALUE Non Essential parameter REMARKS CGS name is used to give an easily remembered identity to the CGS in addition to the CGS NUM For example CGS between Delhi and Calcutta may be named as DEL CAL 42 C DOT CCS7 PARAMETERS DESCRIPTION 6 2 4 CGS NUM Circuit Group Set Number PARAMETER NAME Circuit Group Set Number MNEMONIC CGS NUM TYPE 2 Numeric POSSIBLE
108. national number PCM ID field in TEN NO7 TEN contains six field arranged in the format BM NO RACK NO FRAME NO SLOT NO PCM ID CIRCUIT NO PCM ID field allots a unique number called CIC number to the TENs of TGP i e with PCM ID 1 1 1 2 7 1 2 to 32 the TENs 1 1 2 7 2 to 32 will have CIC numbers starting from 1 to 31 Similarly for PCM id 2 CIC numbers will start from 32 onwards It has to be ensured that a particular circuit should have same CIC number at both the ends TGP CAT Always give a unique number to TGP CAT parameter for CCS7 tgps It should not be given to any other non CCS7 trunk groups Subscriber Charge For CCS7 TGPs modify subscriber charge characteristic for calling category CCS7 tgp cat called category subscriber category For these two categories non metered charge rate number with metering info as charged should be used only if charge band method of charge is being used on CCS7 trunks 2 CRE LS Related Parameters LOG LNK Logical link id should be same at both the end or nodes For example if TEN DAT LNK 1 1 2 7 17 is given logical link id as 0 at C DOT end then the same time slot or PCM circuit should be made logical signalling link 0 at other end also 3 CRE SRS Related Parameters PRI RT TBL should contain the link set LS number going towards the destination specified in the DPC parameter USER S MANUAL 199 Il CCS Data Creation for SSP Application 1 1
109. ne TUC out of service Both TUCs out of service Urgent alarm wili be raised for SUM Critical alarm at OOD On ADP critical alarm will be raised for SUM Non urgent alarm at OOD On ADP alarm wil be raised for the home BM Critical alarm at OOD On ADP alarm wil be raised for the home Also critical alarm wil be raised for SUM B ROUTINE MAINTENANCE MAINTENANCE that plane they should be inservice Diagnose the memory BME and if found faulty replace the card and bring it in service by PUT SWU INS command Same as in 3 above Check if any higher unit of that copy is out of service Check if PSU of that plane is out of service Check the fuse of TUI card Diagnose the TUC and see if there is a communication problem between the TUC and other units i e cable problem etc or with SPC If TUC found faulty replace the card and bring it inservice by PUT SWU INS command In this case SUM will go out of service and after TUC comes inservice SUM will go for initialization Check if some higher unit is down e g If SUM is in concentration then Principle TUC or TSC is down If all higher units are inservice then check the 183 Chapter 11 S No Hardware Switch Unit Alarm type Corrective action Unit Fault fuse of cards Diagnose both TUCs and find the exact fault 1 communication problem with higher unit due to cable problem or problem with SPC etc If TUCs fo
110. ng duration vi To identify important observations reports which are of interest to the support centre 11 2 1 3 Verifying System Integrity It is worthwhile to keep verifying system s integrity manually from time to time This can help in uncovering those faults that might have remained undetected so far USER S MANUAL 179 Chapter 11 11 2 2 11 2 3 11 2 3 1 180 Trouble Shooting The need for this phase arises either on external complaints or observation of abnormal situations or when the system itself finds one or more units faulty Fault isolation involves interpretation of Alarm and associated Report and if applicable use of on demand tests and reference to system trouble fixing procedures given this chapter Repair action such as card replacement if not critical can be deferred to convenient hours as the system in most of the cases can automatically recover from faults through reconfiguration Periodic Routining This involves exercising those parts of the system hardware elements which are not normally in use so as to bring out the latent faults much before they adversely affect user services and to reduce the chances of an active unit going faulty in case of duplex units This can be done manually by issuing diagnostic commands by the operators The system has however the capability to periodically routine entire hardware and generates routining reports Maintenance personnel have to dictate the time
111. nk LOG LNK 2 Numeric 0 to 15 Range or set not allowed None Essential Parameter It is the logical identity of the link in the linkset 6 2 15 LS NUM Link Set Number PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS 46 Link Set Number LS NUM 2 Numeric 1 to 64 Range or set not allowed None Essential parameter Link set is a set of signalling links of the same CGS Link set number is used to identify a signalling link set in a link set bundle Link set is a set of signalling links between adjacent nodes The links within the set are logically numbered The error correction option i e Basic or PCR is same of all links in link set C DOT CCS7 PARAMETERS DESCRIPTION 6 2 16 LSB NUM Link Set Bundle Number PARAMETER NAME Link set Bundle Number MNEMONIC LSB NUM TYPE 2 Numeric POSSIBLE VALUES 1 to 64 Range of set not allowed DEFAULT VALUE None REMARKS LSB also called combined link set is a set of all signalling link sets between two adjacent signalling points The link sets in a LSB have the same link management method maximum message size and list of STP users and destination point codes LSB has only a logical significance 6 2 17 MNAC LN Minimum Active Links PARAMETER NAME Minimum Active Links MNEMONIC MNAC LN TYPE 2 Numeric POSSIBLE VALUES 1to 16 Range or set not allowed DEFAULT VALUE 1 REMARKS It is the minimum active links threshold in a link set If the
112. number of active links falls below this value the maintenance system is alerted via a threshold cross report The system will try to activate more links in order to reach this threshold 6 2 18 MNAV LN Minimum Available Links PARAMETER NAME MNEMONIC TYPE POSSIBLE VALUES DEFAULT VALUE REMARKS USER S MANUAL Minimum Available Links MNAV LN 2 Numeric 1to 16 Range or set not allowed 1 It is the minimum number of links available for carrying traffic in a link set 47 Chapter 6 6 2 19 MX MSG SZ Maximum Message Size PARAMETER NAME Maximum Message Size MNEMONIC MX MSG SZ TYPE 7 ASCII POSSIBLE VALUES 1 DATA62 2 DATA272 3 DYNAMIC DEFAULT VALUE None Essential parameter REMARKS Defines the maximum signalling information field SIF size to be handled Generally ISUP implementation DATA272 i e 272 octets SIF size is used SIF contains routing label and actual signalling information 6 2 20 MX OC RB Maximum Octets in Retransmission Buffer PARAMETER NAME Maximum Octets in Retransmission Buffer MNEMONIC MX OC RB TYPE 5 Numeric POSSIBLE VALUES 1 to 65535 Range or set not allowed DEFAULT VALUE None Essential parameter REMARKS Defines the maximum number of message octets to be retained in the retransmission buffer MXMS RB and MXOC RB are used in tandem to control the levels of retransmission buffers 6 2 21 MXAV LN Maximum Available Links PARAMETER NAME MNEMONIC TYPE POSSIBLE
113. odes and other network specific data system parameters and network configuration data utilised by CPU processes is kept in the CPU memory and maintained by its own database routines Routines are available for insertion deletion selection updation and modification of data A part of this data is maintained in a different format in the central database in BP and AP as well which is accessed by concerned processes using the standard database routines These data are downloaded and modified through man machine commands 30 C DOT CCS7 4 1 4 2 4 3 Chapter 4 Call Processing INTRODUCTION Building upon the discussion on the SUM architecture in the last chapter in this chapter the hardware software interactions are illustrated with the help of ISUP call handling procedures In C DOT DSS MAX ISUP call handling is different from non ISUP call handling This is so because of the SUM hardware and software which now have to participate in call handling Apart from this the general philosophy of call processing remains the same In the following sections the processes of handling an ISUP incoming terminating call and an ISUP transit call is described Originating outgoing call flow is essentially similar to the incoming terminating call flow described below ISUP CALL MESSAGE SEQUENCE The signalling message sequence during the handling of a successful and unsuccessful ISUP call is depicted in Fig 4 1 and 4 2 The dis
114. of day at which routining should be done the sequence in which units be tested and the periodicity of routining The strategy regarding assignment of active or passive role to a duplex unit found fault free after routining is to be chosen and communicated to the system in advance Following steps are needed for periodic testing a Deciding a schedule for routine testing b Conveying the schedule to the system c Analysing routining reports Each one of the above steps is described below Deciding a Schedule This involves the following i To choose the time of testing routining in such a way that subscriber services are least affected ii To choose appropriate interval for routining giving due weightage to the fact that faults should not remain hidden for too long iii To choose a sequence in which units are to be tested C DOT CCS7 ROUTINE MAINTENANCE iv To ensure that various units and links of the system do not remain in non active service for too long A typical schedule could be as follows Periodic testing is performed daily at low traffic hours say at 00 30 hrs at night Higher level unit say BP is tested before a lower level circuit say a terminal circuit gets tested After a duplex unit is found fault free it is assigned ACTIVE state and its mate standby state Care is also taken that links which have been unused earlier become under use active now 11 2 3 2 Conveying the Schedule to System
115. of the CGS In CRE TGP command this parameter is relevant only when signalling defined is CCS7 LIN SIG DIG CCS and SIG CCITT R7 C DOT CCS7 PARAMETERS DESCRIPTION 6 2 39 USR PART User Part PARAMETER NAME User Part MNEMONIC USR PART TYPE 11 ASCII POSSIBLE VALUES 1 NO USR PART No user part defined 2 ISUP ISDN User Part DEFAULT VALUE ISUP REMARKS It identifies the user part of MTP Presently only ISUP is used USER S MANUAL 55 7 1 56 Chapter 7 Operator Command Sheets INTRODUCTION Operator command sheets are given in order to help the operating personnel in familiarising themselves with the interactions that take place while issuing various CCS7 administration and maintenance commands At best they purport to be a WYSIWYG that is what you see is what you get representation of these interactions The operating personnel can get an idea about the functions that are performed by a CCS7 administration maintenance command the parameter that are required for its execution the precautions to be observed and various probable error messages that he or she may encounter and what they mean Although help is available online it will always be a help to pre familiarise oneself before attempting any command Typically the course of interaction is as follows 1 Operator issues command at the CRP prompt 2 The system responds with a parameter entry form and prompts the operator
116. ol Part SCCP The Signalling Connection Control Part SCCP has the functions of the network as well as the transport layers of the CCS7 protocol stack Together with the MTP it provides true OSI transport layer capabilities Unlike MTP which provides only datagram service SCCP provides connection oriented and connection less services as well Thus while MTP is sufficient for circuit switched applications like TUP and ISUP for non circuit related applications such as database querying the enhanced addressing capability of SCCP is required SCCP has a unique scheme of addressing and routing based on Global Titles SCCP utilizes the services of MTP to route its payload from one node to other In addition to routing transaction related messages submitted by the Transaction Capabilities Application Part TCAP SCCP also segments and sequences large TCAP messages to fit into the MTP packet size At the distant node it is the responsibility of the peer SCCP to re assemble the segmented message Transaction Capabilities Application Part TCAP TCAP is an application part in the CCS7 stack and is responsible for establishing dialogue with remote databases It carries the data of higher layers like INAP and MAP and invokes remote operations An operation at remote end requires a series of queries and responses as part of a TCAP dialogue Management of a dialogue requires Establishing a dialogue Continuing the dialogue Terminating the
117. on of the control processes switch block and signalling systems Fig 1 2 illustrates that in a CCS environment the switch block routs the speech paths as before however a separate path internal to the exchange routs the signalling denoted by a dotted line This approach allows maximum flexibility in optimising exchange and signalling development The approach gains maximum benefit when adopted in parallel with the introduction of digital exchanges and digital transmission systems CCS system being particularly efficient in these circumstances ADVANTAGES OF COMMON CHANNEL SIGNALLING Common Channel Signalling is being adopted throughout the world in national and international networks for numerous reasons The main reasons are a The rapidly changing control techniques of exchanges b The limitations of CAS systems c The evolutionary potential of CCS systems C DOT CCS7 INTRODUCTION EXCHANGE A EXCHANGE B SPEECH EW X X SIGNALLING SWITCH BLOCK SWITCH BLOCK CONTROL CONTROL LEGEND SPEECH SIGNALLING FIG 1 1 CAS SIGNALLING WITH SEPARATE CONTROL AND SWITCH BLOCKS DESIGN CCS7 UM CCS7 CA USER S MANUAL Chapter 1 EXCHANGE EXCHANGE B SPEECH X X X X X X SWITCH
118. ort 146 C DOT CCS7 OPERATOR COMMAND SHEETS START STOP TRF RPT PARAMETER ENTRY FORM START TRF RPT TRAFFIC REPORT LNK REP amp RTSET REP amp SCCP REP amp TCAP REP STOP TRF RPT STOP TRAFFIC REPORT HPT TYP LNK REP amp RTSET REP amp SCCP REP amp TCAP REP START STOP TRF RPT OUTPUT FORM HEPORT TYPE UNIT PERIODICITY Signalling Link Report MIN 60 Signalling Route Set Report 60 60 60 Note These reports are available 1 5 release only USER S MANUAL 147 Chapter 7 7 6 10 Display Traffic Report MAINTENANCE COMMAND Display Traffic Report MNEMONIC DISPL TRF RPT CLASS MENU POSITION 1 10 5 Displav GENERAL INFORMATION COMMAND Display Traffic Report MNEMONIC DISPL TRF RPT FUNCTION display one or more traffic reports PARAMETERS REQUIRED REP TYP REMARKS This command can be used to display traffic report for DISPL TRF RPT PARAMETER ENTRY FORM DISPL TRF RPT DISPLAY TRAFFIC REPORT RPT ID LNK REP FRM DATE 8 8 1997 TO DATE 8 8 1997 FRM TIME 19 00 16 20 00 16 MOD NO SUM 148 C DOT CCS7 OPERATOR COMMAND SHEETS DISPL TRF RPT OUTPUT FORM PERIODIC REPORT ON SIGNALLING LINK DATE MODULE NO Duration Of Observation Link Set Bundle Number Logical link in the Bundle Number of signalling octets transmitted Number signalling octets
119. oupset number This command displays the identity of CGS which is served by this LSB and the LSB parameters The constituent signalling links of the LSB are also shown USER S MANUAL 105 Chapter 7 DISPL LSB PARAMETER ENTRY FORM DISPL LSB DISPLAY LINK SET BUNDLE LSB NUM DISPL LSB OUTPUT FORM DISPLAY LINK SET BUNDLE CHARACTERISTICS Link Set Bundle Number 1 Circuit Group Set Number 1 Circuit Group Set Name 1 Link Management Method SECOND Maximum Message Size DATA272 Self Point Code 9998 Destination Point Code 1104 Signalling Network NW NAT STP Users NONE DEST PCs NONE Link Set in LSB 1 Data Links TENs of LSB 7 1 1 17 18 7 1 1 3 18 106 C DOT CCS7 OPERATOR COMMAND SHEETS 7 3 5 Display Circuit Groupset Number to Name Mapping ADMINISTRATION COMMAND Display Circuit Groupset Number to Name Mapping MNEMONIC DISPL CGS NUM CLASS MENU POSITION 1 32 6 NAME Display COMMAND Display Circuit Group Set Number to Name Mapping MNEMONIC DISPL CGS NUM NAME FUNCTION translate the circuit group set name into number and vice versa PARAMETERS CGS NUM CGS NAME REQUIRED REMARKS If default parameters are selected the entire list of circuit group set numbers created for the exchange are shown with their corresponding names USER S MANUAL 107 Chapter 7 DISPL CGS NUM NAME PARAMETER ENTRY FORM DISPL CGS NUM NAME DISPLAY CIRCUIT GROUP SET NUM TO NAME MAPPING CGS NUM i 1
120. outed The following parameters are significant from CCS7 point of view CGS NUM CGS Number CGS NAME CGS Name SIG INF Signalling Information CONT CHK Continuity Check Indicator ECHO SUP Echo Suppression Indicator SAT IND Satellite Indicator TEN NO7 No 7 include PCM number For description of these please refer to the remarks given for DISPL TGP command USER S MANUAL 125 Chapter 7 CRE TGP PARAMETER ENTRY FORM CRE TGP TGP NUM TGP NAME TGP STA LIN SIG REG SIG MF SIG CGS NUM CGS NAME RNK DGT TRK PRI PFX DGT PAD LEV TGP TYP TGP FCY DGT SZFD RNG DWN DIAL TN AC STA AC INFO TGP CAT HNT TYP SIG INF CONT CHK ECHO SUP SAT IND TEN TEN NO7 126 CREATE TRUNK GROUP 45 TAX BW OG DIG CCS CCITT R7 INVALID 1 CAL TAX 3 1 3 NO NO 2WP 770000 1 SEQ ISUP CRG CHB CHK NRQD ECH SP NRQD NO SAT NONE 7 1 3 17 1 2 to 7 1 3 17 1 32 C DOT CCS7 OPERATOR COMMAND SHEETS CRE TGP OUTPUT FORM CREATE TRUNK GROUP REPORT Trunk Group Number Trunk Group Name Trunk Type Line Signalling Scheme Register Signalling Scheme MF SGN TYPE Circuit Group Set Number Circuit Group Set Name Rank of Digits Trunk Priority Prefix Digits PAD Level Trunk Group Type Special Facility MIN DIG Seize FWD Ring Down Signalling Dial Tone Trunk Group Category Trunk Group Hunt Type Signalling Information Continuit
121. p AVAILABLE state then follow the corrective procedure given in Fig 11 1 11 3 3 Signalling Link Related Problems Status of a signalling link can be one of the following 1 Activated and Available ii Out of Service iii Activated and Blocked Remotely Blocked iv Deactivated v Activated and Locally Inhibited Remotely Inhibited Signalling link will carry signalling messages only in the Activated amp Available state If signalling link is locally blocked or locally inhibited then unblock or uninhibit the link by using the Mod Ink sts command If the link is remotely blocked or remotely inhibited then ask the other exchange personnel to unblock or uninhibit the signalling link from his side by using appropriate status change command If the signalling link is in deactivated state then try signalling link activation by using MOD LNK STS or MOD LS STS command and follow the steps given in Fig 11 2 Fig 11 3 11 3 4 Initialisation Related Problems If SUM was up and it goes for some level of initialization due to ETE failure with home BPC or APC or PSU fault etc and then does not come up then Check if TUC of SUM is inservice and atleast one copy of SU is inservice If yes then reset all the SHM cards Else first bring atleast one copy in service If initialization does not start still then give a soft start to the home BM USER S MANUAL 185 Chapter 11 START REASON LOCAL OR
122. protocol C 85 terminals The maximum number of SHM cards be 4 if the SUM CPU is BPO or 8 if the SUM CPU is HPO Since there are 8 terminals on a SHM card total 32 or 64 terminals are available Out of the pool of PHC terminals say N 32 or 64 the minimum overhead for internal communication is as follows a Two 2 C 85 terminals for internal message communication of the SUM with the home BM b One 1 C 85 terminal each for any other BM having CCS7 trunk circuits or signalling data links In case of Service Switching Point SSP application one C 85 terminal per equipped BM is required Hence total requirement for C 85 type of terminals will be say where m No of BMs other than home BM having 57 circuits links 2 1 or No of BMs 1 ii in case of SSP application And the no of terminals available for signalling n N m iii At the time of SUM initialization there is automatic allocation of C 85 and signalling terminals in the rates dictated by the system parameters INT THR and NO7 THR These parameters are infact the threshold for the internal C 85 and signalling NO7 terminals The value of these thresholds should be set such that the minimum number of internal C 85 terminals are available at initialization Else the thresholds have to be modified The value of INT THR is given by m INT THR N 100 iv and NO7 THR 100 INT THR 190 C DOT CCS7 ENGINEERING THE
123. protocol terminals or as C 85 protocol C DOT proprietary protocol a variation of X 25 protocol terminals for internal control message communication Two PHC terminals are configured as C 85 terminal at the time of SUM initialisation in order to enable code and data downloading from the Input Output Module The number of C 85 terminals is however variable and depends upon the switch configuration The communication with the Base Processor of the home BM and between PHC terminals is handled by the SUM CPU 507 complex which is also the central control of the SUM The protocol software is distributed over SHM 507 and cards Table 3 1 depicts the software distribution over various processors USER S MANUAL 23 Chapter 3 24 BM CM AM CONTAINS SUM TIME SWITCH SPACE SWITCH SS7 DIGITAL T TRUNKS 287 DTU lj Ei TU ANALOG LINES amp TRUNKS 7 y j i T P a 7 7SU ns ed b b 5 BMS ZH A SSC TSC 2 A CMS AP AM LEGEND CODE DATA DOWNLOADING PATH H NAILED UP 7 SIGNALLING LINKS 4 NAILED UP INTERNAL MESSAGE 85 LINKS FIGURE 3 1 TU fo les hy d f TIME SWITCH BMn CONTAINS CCS7 CIRCUITS 7 5 DTU EE TRUNKS u DTU ANALOG u DTU LINES amp TRUNKS v DTU
124. rame is unequipped Download read only data in SSC APC all the BMs including the home BM Update the unit status and card status for SUM with the Central Configuration Manager CCM Update equipage information of 7SU in the home BPC Check if TIC is OOS OPR Update the existence of SUM in SSC and APC If the frame was previously unequipped and this is the only frame equipped as SUM frame in the switch this command will be honoured otherwise rejected This can be confirmed after checking the database at the IOP The data at IOP is created for SUM BM Configuration Manager BMCM in the home BPC then marks the status of TIC as OOS OPR further requests to EQUIP FRAME should be rejected henceforth C DOT CCS7 Check SUM RETROFIT PROCEDURE The report of the 7SU equipage is sent after the above procedure The alarms for the 7SU are allowed henceforth Equip PHCs in the slots in which SHM cards are physically present Use the command EQUIP TRML CARD with the following parameters HW TYP PHC VER NO 1 CARD SLT BM rack frame slot where slot 7 8 9 10 and 17 18 19 20 depending on the slot position of the PHC At least one PHC must be equipped in any of the slots to provide the C 85 channel towards the home BM and hence enable SUM initialization This equips the SHM card s in the SUM The command will be rejected if SUM is not already equipped in the switch Initialize SUM Use the command PUT SWU
125. ration ADP directly communicates with the Base Processor Input Output Module IOM is a powerful duplex computer system that interfaces various secondary storage devices like disk drives cartridge tape drive and floppy drive It supports printers and upto 32 video display units that are used for man machine communication interface All the bulk data processing and storage is done in this module Thus a C DOT DSS MAX exchange depending upon its size and application will consist of Base Modules maximum 32 in case of MAX XL Central Module Administrative Module Input Output Module and Alarm Display Panel The Base Modules can be remotely located or co located depending on the requirement For more details on the hardware and software architecture please refer to the document C DOT DSS MAX XL General Description CCS7 SIGNALLING UNIT MODULE The ITU T Signalling System No 7 CCS7 capability in C DOT DSS MAX exchange is provided in the form of the Signalling Unit Module SUM It is a standalone equipment frame that can be used and retrofitted in any exchange configuration Only one such unit is required in an exchange The place of SUM in the switch architecture is similar to that of a Terminal Unit TU SUM is equipped in one of the co located Base Modules in a Terminal Unit frame position Although SUM is a module by itself and contains global resources it has been deliberately placed at the front end in order to make it in
126. received Duration of link in the inservice state Duration of link unavailability Number of signalling units received in err Duration of link failure Number of MSUs dumped due to SL congestion Number of link failures Time of link failure 18 30 33 18 38 17 00 00 00 00 00 00 00 00 00 USER S MANUAL 8 AUG 1997 19 00 16 SUM 6 minutes 1 0 44017 15273 3360 Seconds 0 Seconds 0 10 Seconds 0 2 Reason for link failure High Bit Error Rate High Bit Error Rate 0 0 0 149 Chapter 7 DISPL TRF RPT OUTPUT FORM PERIODIC REPORT ON SIGNALLING ROUTE SET DATE 14 MAR 1997 13 30 27 MODULE NO Duration Of Observation Destination point code of Routeset Signalling Network Signalling Route set number Duration of Unavailability of Routeset Number of Message dumped due to Routing Error Number of times point code became inaccessible Time when point code became inaccessible SUM 15 minutes 9998 NW NAT 1 0 0 18 30 33 18 38 17 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fe Since there is onlv signalling link to DPC 9998 whenever the link fails this particular destination will become inaccessible 150 C DOT CCS7 OPERATOR COMMAND SHEETS PERIODIC REPORT ON SCCP DATE 29 JAN 1998 15 59 56 OBS DUR 60 MINUTES MODULE NO SUM REPORT ON ROUTING FAILURE OCCURRENCES No translation for address of such nature No translation for specific address Syntax Error 0 0 SCCP
127. red Program Controlled SPC switches Where the intermediate nodes may be used as Signal Transfer Points STPs CCS7 network be used for transmitting call related messages as well as slow speed data packets between ISDN users The Signalling Connection Control Part SCCP enables it to act like a packet network Thus it is an important pre requisite to Integrated Service Digital Network ISDN C DOT CCS7 INTRODUCTION and Intelligent Network IN features Enhanced service for the public telephone network can also be provided using this message based signalling system Some of the salient features of CCS7 are 1 5 1 Fast reliable and economical Bit oriented protocol Labelled messages Associated and quasi associated mode of working Error correction is supported at link level level 2 by transmission and sequence control Message routing is supported by signalling message handler at level 3 Redundancy and load sharing is possible on signalling links Changeback on link restoration is possible Redundancy and load sharing is possible on signalling routes alongwith diversion on route failure CCS Protocol Stack The CCS7 protocol stack comprises of four layers With reference to the OSI 7 layer model the correspondence between the layers is depicted in Fig 1 3 The functions defined for each layer or level are briefly described in the following paras Level 1 Any node with the capability of handling CCS7 is t
128. rnal message communication between 507 and home is also handled by SMH See Fig 3 3 for the place of SMH in the software architecture of SUM SMH is resident on as well as 507 Signalling Network Manager SNM The Signalling Network Manager constitutes a major part of the level 3 software resident on the 507 It is responsible for managing the overall organisation of signalling paths in the network and takes corrective action in case of failure restoration or addition of new links routes or nodes The tasks of signalling network manager are distributed amongst a number of eternal processes They maintain and use a common database containing informations both static and dynamic about the status of links routes and nodes the network configuration and the connections within the home node The message handler for routing of signalling messages uses this information The signalling network management processes communicate with one another using messages and also with the external world via the message handler The external world comprises the following e Neighbouring nodes in the network they exchange messages about reconfiguration of links blocking the traffic etc Local management maintenance and administration subsystem exchanging blocking unblocking inhibition uninhibition requests and responses and the messages to change path connections within the exchange USER S MANUAL 27 Chap
129. s on an ISUP trunk SCP checks the free busy status of the trunk circuit 1 e CIC If the circuit is free then an incoming trunk terminal process ICUP Incoming ISDN user part is created for catering to ISUP protocol at the incoming end Once this process is created SCP forwards the Initial Address Message IAM received from preceding exchange to it ICUP extracts the called party number from IAM and performs preliminary digit analysis to determine whether the call is terminating in the same exchange or is outgoing from the exchange etc When the called party is outgoing from this exchange then called party digits are used for determining the trunk group on which the call is to be routed It is then checked whether free trunk circuits are available in the trunk group After a free circuit is selected on the outgoing route in outgoing trunk terminal process OGUP Outgoing ISDN User Part is created for catering to ISUP protocol at the outgoing end and the IAM received from the preceding exchange is forwarded to the succeeding exchange on the signalling link and ACM timer is started Ringing Phase C DOT CCS7 CALL PROCESSING For an outgoing call charging information is defined on the route for the incoming trunk group category and this information is passed to ICUP When is received from the succeeding exchange voice path is switched and if the charge data indicates that this exchange has to do the charging the CRG messa
130. t Number 1 72 C DOT CCS7 OPERATOR COMMAND SHEETS 7 2 8 Create a Circuit Group Set ADMINISTRATION COMMAND Create a Circuit Group Set MNEMONIC CRE CGS CLASS MENU POSITION 1 31 8 Update GENERAL INFORMATION COMMAND Create a Circuit Group Set MNEMONIC CRE CGS FUNCTION create a circuit group set consisting of physical circuits between two nodes PARAMETERS CGS NUM CGS NAME SELF PC DEST PC REQUIRED SIG NW USR PART REMARKS Circuit group set consists of physical circuits between two nodes in the CCS7 network These circuits are referred to by Circuit Identification Codes CICs A CGS may contain circuits of more than one trunk group The CICs in such a case are sequentially numbered CGS is a part of both trunk group and link set bundle It provides with signalling links an association of voice trunk link sets USER S MANUAL 73 Chapter 7 CRE CGS PARAMETER ENTRY FORM CRE CGS CREATE CIRCUIT GROUP SET FOR THIS EXCHANGE CGS NUM CGS NAME SELF PC DEST PC SIG NW USR PART CRE CGS OUTPUT FORM CREATE CIRCUIT GROUP SET REPORT Circuit Group Set Number 2 Circuit Group Set Name Self Point Code Destination Point Code Signalling Network User Part Type 74 C DOT CCS7 OPERATOR COMMAND SHEETS 7 2 9 Delete a Circuit Group Set ADMINISTRATION COMMAND Delete a Circuit Group Set MNEMONIC DEL CGS CLASS MENU POSITION 1 31 9 Update GENERAL INFORMATION
131. t is responsible for transferring information in messages from one signalling point to another The combination of level 1 to 3 is known as the message transfer part MTP The MTP controls a number of signalling message links and network management functions to ensure correct delivery of messages This means that the messages are delivered to the appropriate exchange in an uncorrupted form and in the sequence that they were sent even under failure conditions in the network Level 4 Level 4 comprises the parts The meaning of the messages transferred by the MTP and the sequence of actions for a particular application e g telephony is defined by the user parts key feature is that many different user parts may use the standardised MTP Hence if new requirements arise that had not been foreseen previously the relevant user part can be enhanced or a new user part derived without modifying the transfer mechanism or affecting other user parts Three user parts have been defined the Telephone User Part TUP the ISDN User Part ISUP and the Data User Part DUP Along with SCCP which provides end to end signalling capability MTP constitutes the Network Services Part NSP which provides the Network Layer functionalities of the OSI model The user parts of NSP USER S MANUAL 13 Chapter 1 14 are Operations and Maintenance Application Part and Mobile Application Part MAP Signalling Connection Contr
132. ted 62 C DOT CCS7 OPERATOR COMMAND SHEETS DEL SRS PARAMETER ENTRY FORM DEL SRS DELETE SIGNALLING ROUTE SET SRS NUM DEL SRS OUTPUT FORM DELETE SIGNALLING ROUTESET REPORT Signalling Route Set Number USER S MANUAL 63 Chapter 7 7 2 4 Create Self Point Code for Exchange ADMINISTRATION COMMAND Create Self Point Code for Exchange MNEMONIC CRE SPC CLASS MENU POSITION 1 31 4 Display GENERAL INFORMATION COMMAND Create Self Point Code for Exchange MNEMONIC CRE SPC FUNCTION create a self point code for exchange in a signalling network PARAMETERS SIG NW SPC LST REQUIRED REMARKS SPC is the point code assigned to an exchange which is a node in the CCS7 network analogous to exchange code of the voice network 64 C DOT CCS7 OPERATOR COMMAND SHEETS CRE SPC PARAMETER ENTRY FORM CRE SPC CREATE SIGNAL POINT CODE FOR EXCHANGE SIGC NW NW NAT SPC LST 1104 CRE SPC OUTPUT FORM CREATE SIGNAL POINT CODES REPORT Signalling Network NW NAT Self Point Code 1104 USER S MANUAL 65 Chapter 7 7 2 5 Delete SPC for this Exchange ADMINISTRATION COMMAND Delete SPC for this Exchange MNEMONIC DEL SPC CLASS MENU POSITION 1 31 5 Displav GENERAL INFORMATION COMMAND Delete SPC for this Exchange MNEMONIC DEL SPC FUNCTION delete one or more signal point codes of this exchange PARAMETERS SIG NW SPC LST REQUIRED REMARKS This
133. ter 3 LEVEL 4 LEVEL 2 USER LEVEL 3 MESSAGE PARTS MESSAGE TRANSFER PART TRANSFER PART SIGNALLING NETWORK FUNCTIONS SIGNALLING MESSAGE HANDLING MESSAGE ji MESSAGE DISTRIBUTION DISTRIBUTION MESSAGE gt ROUTING SIGNALLING NETWORK MANAGEMENT SIGNALLING TRAFFIC MANAGEMENT Y SIGNALLING SIGNALLING ROUTE LINK MANAGEMENT MANAGEMENT E gt CCITT 35730 TESTING AND MAINTENANCE MESSAGE TRANSFER PART SIGNALLING MESSAGE FLOW INDICATIONS AND CONTROLS DESIGN CCS7 UM CCS7 SM 28 C DOT CCS7 SUM ARCHITECTURE Level 2 for exchanging messages about signalling terminals status and other protocols e Message handler itself for exchanging messages for co ordination of the various activities Operating Systems The operating system in the 507 is the proprietary C DOT DSS Operating System CDOS which provides communication primitives memory management and timing services for the user processes The OS in PHC is the customised TINIX operating system Related software in other processors include User Parts The Telephone User Part TUP and ISUP are implemented as part of the call processing subsystem which is distributed over different Base Processors Based on the half call concept call related characteristics can be categoris
134. the control function of exchange needs to communicate with the control function of Exchange B e g to initiate the set up of a speech circuit between the exchanges the control function in Exchange A requests the level 4 functions to formulate an appropriate message Level 4 then requests the message transfer part level 1 to 3 to transport the message to exchange B Level 3 analyses the request and determines the means of routing the message to exchange B The message is then transported via levels 2 and 1 Upon receipt of the message by the MTP of exchange B levels 1 and 2 deliver the message to level 3 Level 3 at exchange B recognises that the message has arrived at the correct exchange and distributes the message to the appropriate user part at level 4 Level 4 in exchange B then interacts with the control function to determine the appropriate action and response If problems arise in the transmission process between exchanges and causing message corruption the level 2 functions are responsible for detecting the corruption and retransmitting the information If the signalling link between exchanges A and B is not available e g link has failed the level 3 functions are responsible for re routing the information through the signalling network to exchange B USER S MANUAL 15 Chapter 1 16 EXCHANGE A EXCHANGE B SPEECH CIRCUIT x x x x SWITCH BLOCK CONTRO
135. tiplexed to offer a 2 048 Mbps stream towards the TUC Figure 3 2 depicts the hardware architecture of SUM Messages received from the HDLC or messages to be transmitted to the HDLC are deposited in shared RAM that can be accessed by both the PHC processors as well as the 507 The 507 address and data bus extends to the PHCs to access shared RAM containing messages Care is taken in the PHC to avoid contention between the processors in PHC and CPU accessing the memory Messages are presented to the SU7 in FIFO queues corresponding to each channel Each terminal is soft configurable to handle 57 or C 85 protocols and switchable to any data link The 507 card which is the central control of the SUM is duplicated and the copies are attached to the same address and data bus accessing the shared RAM on SHM cards At any instant only one 507 copy is active and other lies hot standby mode i e on failure of one copy the other copy takes over immediately Since the messages are stored in the shared RAM on the PHCs messages are not lost and message handling can proceed unaffected in the event of CPU copy switchover SOFTWARE ARCHITECTURE The SUM software is distributed over different processors in SUM and the switch While layer 2 protocol functions are completely carried out by the software resident in the PHC layer 3 protocol functions are distributed over SU7 and the Base Processor of the home BM Call processing functionali
136. to fill in the required values for respective parameters 3 When all the valid parameter values are filled in the system then asks the operator to choose whether he she wants to Repeat R Terminate T or Execute E the command with the given parameters If the operator chooses to Repeat R If the command is executed successfully the action returns to the parameter entry form and once again step 2 is gone through But if the command is rejected on pressing the CR Carriage Return the system returns to the CRP prompt Terminate T The command is abandoned and system returns to the CRP prompt It also displays the message Command Terminated C DOT CCS7 OPERATOR COMMAND SHEETS Execute E The system displays a temporary message Executing indicating that it is processing the command After execution the system displays the message Command Executed and is ready for the issue of next command if the operator so desires For the commands whose execution entails certain output information from the system the result of execution is displayed in the form of Output Forms which may cover one or more screens In case any execution error 18 detected by the system it will respond with an Error Report An error report contains the code of the error encountered and a short description of the error Some general comments about the process of execution of 7 administration Maintenance commands Help is
137. ty the ISUP is resident on the Base Processor This is depicted in Table 3 1 also The software subsystems are described briefly in the following paragraphs USER S MANUAL 25 Chapter 3 VH ZSOO WN ZSOOWNDSIS3AC Z0E890W HOSS30OHdOHOIN d 77 onl AWIL OL sdqN8 INL SYNLOALIHOYV WINS LHOd WvHdq OQN3931 snas ndo 8 GHVO WHS Li x L L AdO9 6 U GHVO WHS No ndo ns T GHVO WHS 4 N d 8 Wa 8 Fi T 20589 n WVH 2 H 2 s s dq o 5 b AdO9 e L 3 V nao ns 20589 OS WVH 2 s ndo S3nano WNIWYSL GYVO WHS C DOT CCS7 26 SUM ARCHITECTURE Table 3 1 CCS7 Software Distribution Functionality Subsystem Hrdware Unit Level 2 SHM Level 3 SHM SU7 ISUP 507 Base Processor Maintenance Base Processor SU7 SHM Administration Base Processor Administrative Processor SU7 SHM Signalling Message Handler The message handler is responsible for discrimination of incoming messages their distribution to the user parts or routing to other signalling network nodes The inte
138. ule b Central Module Administrative Module d Input Output Module The Base Module BM is the basic growth unit of the system It interfaces the external world to the switch The interfaces may be subscriber lines analog and digital trunks CCB and PBX lines and digital links from remote modules Each Base Module can interface upto 2024 terminations The number of Base Modules directly corresponds to the exchange size It carries out majority of call processing functions and in a small exchange application also carries out operation and maintenance functions with the help of the Input Output Module In Single Base Module SBM exchange configuration the Base Module acts as an independent switching system and provides connection to upto 1500 lines and 100 trunks In such configuration the Base Module directly interfaces with the Input Output Module for bulk data storage and operations and maintenance functions Clock and synchronisation is provided by a source within the Base Module It is a very useful application for small urban and rural environments With suitable modifications in hardware and software a Base Module can be remotely located to form a part of a Remote Switch Unit RSU configuration Central Module CM consists of a message switch and a space switch to provide inter module communication and perform voice and data switching between Base Modules It provides control message communication between any two Base Modules
139. und faulty then replace the card and bring it inservice by PUT SWU INS command Test all the PHC terminals urgent urgent by giving TST TRM critical alarm at command If the test fails jackout and jack in the PHC card and test again PHC card out Terminal of service S OOD depending on the threshold kept at limit system If the card fails again replace the card All PHC cards out of service Critical alarm at OOD At ADP critical alarm for SUM wil be raised SUM goes for initialization Check if PSU of that plane are inservice or not If PSU of plane faulty replace the PSUs The test the terminals of that card If cards are found faulty replace the cards Note Do not Put free out all the PHC cards of SUM If such a situation arises then see the corrective action given in dos amp dont s 11 3 2 CCS Voice Circuit Related Problem In the event of unavailability of signalling links the CCS7 voice circuits will come in INS INSF S7BSY state In such an event the circuits will be blocked and not available for voice communication First check if the signalling link corresponding to the voice circuits CICs are ACTIVATED amp 184 C DOT CCS7 ROUTINE MAINTENANCE AVAILABLE If all the signalling links are down i e out of service deactivated or blocked voice circuit will be S7BSY So try to activate at least one signalling link If even one signalling link is in ACTIVATED am
140. user not accessible 0 0 0 Unknown Message Total no of reassembly failures 0 REPORT ON NUMBER OF SCCP MESSAGE EXCHANGED PER SUBSYSTEM SCMG INAP UDT sent 0 UDT rcvd XUDT sent XUDT rcvd UDTS rcvd XUDTS rcvd Total no of UDTS messages sent by SCCP Total no of XUDTS messages sent by SCCP Total no of messages sent by SCCP Total no of messages received by SCCP Total no of reassemblies Total messages for local subsystem Total messages requiring Global Title Translation Total messages sent to a backup Subsystem Total relay messages USER S MANUAL 151 Chapter 7 PERIODIC REPORT ON TRANSACTION CAPABILITIES APPLICATION PART DATE 29 JAN 1998 15 00 15 OBS DUR 60MINUTES MODULE NO BM 1 REPORT ON NUMBER OF TCAP MESSAGES EXCHANGED Number of TCAP Messages Received 80 Number of TCAP Messages Sent 20 Number of P ABORT Messages Received Number of P ABORT Messages Sent REPORT ON NUMBER OF COMPONENTS EXCHANGED Number of Components Received 80 Number of Components Sent 20 Number of Rejected Components Received 0 Number of Rejected Components Sent 0 REPORT ON DIALOGUES Total no Of Dialogues Maximum Dialogue Duration ms Minimum Dialogue Duration ms Average Dialogue Duration ms 152 C DOT CCS7 OPERATOR COMMAND SHEETS 7 6 11 Display Switch Unit Status STATUS Display COMMAND Display a switch unit status MNEMONIC DISPL SWU STATUS FUNCTION Displays the maintenance status of the spec
141. y USER S MANUAL 59 Chapter 7 7 2 2 Modify a Signalling Routeset ADMINISTRATION COMMAND Modify a Signalling Routeset MNEMONIC MOD SRS CHAR CLASS MENU POSITION 1 31 2 Update GENERAL INFORMATION COMMAND Modify a Signalling Route Set MNEMONIC MOD SRS CHAR FUNCTION To modify the characteristics of a signalling route set PARAMETERS SRS NUM HI RTBL LO RTBL SSN LST REQUIRED REMARKS This command is used to change the signalling route priorities Note SSN LST is presently available only in 1 5 x x releases 60 C DOT CCS7 OPERATOR COMMAND SHEETS MOD SRS CHAR PARAMETER ENTRY FORM MOD SRS CHAR MODIFY A SIGNALLING ROUTE SET SRS NUM HI RTBL LO RTBL 6 SSN LST NONE 65535 NONE NONE MODIFY SIGNALLING ROUTESET REPORT Signalling Route Set Number 9 High Priority Route Table 1 Low Priority Route Table 6 Subsystem Number List NONE 65535 NONE NONE Note SSN LST is presently available only 1 5 releases USER S MANUAL 61 Chapter 7 7 2 3 Delete Signalling Route Set ADMINISTRATION COMMAND Delete Signalling Route Set MNEMONIC DEL SRS CLASS MENU POSITION 1 31 3 Update GENERAL INFORMATION COMMAND Delete a Signalling Route Set MNEMONIC DEL SRS FUNCTION To delete an existing signalling route set PARAMETERS SRS NUM REQUIRED REMARKS The SRS should exist Before deleting a link set first the SRS associated with it should be dele
142. y Check Indicator Echo Suppression Indicator Satellite Indicator Answer Circuit Status No of Answering Circuits 45 TAX BW BW DIG CCS CCITT R7 INVALID 1 CAL TAX 3 1 3 No No 1 SEQ ISUP CRG CHB CHK NRQD ECH SP NRQD NO SAT 2 WP 570000 Contd USER S MANUAL 127 Chapter 7 Answering Circuit Information Successful TENS Failed TENS Successful TEN NO7 bm rack frame slot pcm ckt 7 1 3 17 1 2 7 1 3 17 1 3 7 1 3 17 1 4 7 1 3 17 1 5 Failed TEN NO7 bm rack frame slot pcm ckt 128 C DOT CCS7 OPERATOR COMMAND SHEETS 7 6 2 Delete a Trunk Group MAINTENANCE COMMAND Delete a Trunk Group MNEMONIC DEL TGP CLASS MENU POSITION 1 3 2 Update GENERAL INFORMATION COMMAND Delete Trunk Group MNEMONIC DEL TGP FUNCTION This command is used to delete an entire trunk group PARAMETERS TGP NAME REQUIRED REMARKS The desired trunk group should not have a route associated to it and also the status of the TGP should be OOS OPR DEL TGP PARAMETER ENTRY FORM DEL TGP DELETE A TRUNK GROUP TGP NUM 45 TGP NAME NONE USER S MANUAL 129 Chapter 7 DEL TGP OUTPUT FORM DELETE TRUNK GROUP REPORT TRUNK GROUP NUMBER 45 TRUNK GROUP NAME 130 C DOT CCS7 OPERATOR COMMAND SHEETS 7 6 3 Delete Trunks from a Trunk Group COMMAND Delete Trunks from a Trunk Group MNEMONIC DEL TRK CLASS MENU POSITION 1 3 3 Update GENERA
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