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WORKSHOP ON C-DOT DSS PRODUCTS

1. Note that for these routes are same TGPs with same ROD as of routes Oxxxx of SDCAs will be used WORKSHOP ON C DOT DSS PRODUCTS 23 Chapter 4 4 2 IMPLEMENTATION OF LEVEL 90 REGIONAL STD IN C DOT 256P RAX e Level 90 can be programmed as REGIONAL STD route and will have special treatment in software e Regional Access 90 falls in between LCL amp STD in hierarchy e To access Level 90 calls subscriber should have access upto REGIONAL or above e Dynamic Locking Unlocking for Regional Access has been provided in database e Detailed Call Records DCRs for 90 calls will be kept along with STD ISD DCRs 4 2 1 Data Creation for Regional STD Level 90 Open Direction 9 as 214 Digit Analysis lt CNFG gt 1 9 2nd DGT Analysis Yes Add Any spare Route No to Direction 9 lt CNFG gt 3 9 route No 22 say gt Add same TGP which has been allotted for Route Code 0 TAX Route lt RUT gt 22 1 lt TGP No gt Change OGCC of this route No 22 and keep its value same as defined for Level 0 TAX route RUT 22 6 lt NXT gt etc Add Regional STD direction 9 AUX 8 1 1 9 Add Route Code 90 amp Route No 22 to REGIONAL STD TABLE AUX 8 2 1 90 22 24 C DOT DSS FAMILY Chapter 5 Known Field Problems This chapter presents the categorisation of various field problems with their suggested so
2. SL NO 65 PROBLEMS Testing of digital circuits are on stream basis and when individual port is faulty the diagnostic TST DTK does not show any faulty port Facility should be there to locate individual channel faulty Whenever any PSU fails in TU it is very difficult to locate fault because by appearance all indications on PSU are O K One TIC is not coming INS Diagnostic OK with both TSCs What can be the reason TIC diagnostic fails in particular slot with both TSCs while same TIC works in other slot TIC comes in service but goes OOS SYS after some times Diagnostics OK with both TSCs BP works on standby mode but if put on active mode it comes OOS SYS Diagnosis OK with both BMS Power alarm for PSU corresponding to some TIC is not disappearing despite change of PSU REMARKS c May be due to threshold alarms for MFC So force out amp force INS all the MFC one by one Individual port testing can be done by using DBE facility Normally if PCM test is ok individucal ports cannot be faulty Replacing PSU by perception is the only remidy by now as PSU is not covered by any DGN Once diagnostics with both TSCs have passed only possibility is of TIC card either active copy or OOS copy faulty The fault being watch Dog Signal failing between two TICs Fault should disappear by changing one of the TICs Otherwise fault is in TU motherboard TUI card in the upper TU may be fa
3. 39 Terminal Test Card TTC become faulty often in SBM Speech quality and chattering noise on all the subscriber of a TU when copy 0 is active It happens due to non release of TA relay in LCC card First identify the Terminal Unit and then particular LCC card by removing the TA cables Now replace that LCC card or Jackout and Jack in of the same card may also help Site specific H W related the possible faults may be SPC card Particular terminal card Mother Board of TU 34 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SL NO 49 PROBLEMS Sometimes one TUI card works in a particular frame and does not work in other frame MU in BM literature is not clear even during failure the diagnostic shows OK In case of power supply failure or flicks i e when F R is switched on PSU 2 cards of CM goes faulty and critical alarm is observed When we are putting one copy of TIC TI12 1 inservice chattering starts We changed all three cards TUI SPC amp TIC but same result comes We removed all line cards in that frame and then put that TIC copy inservice but no change One way speech trouble If we give dgn swu for TIC it give ok report But we will get one way speech trouble in some slots of same TU If we change TUI or TIC or SPC the problem will be solved In such cases why dgn is not failing Individually SS 0 SS 1 IFCs and CMSs diagnosed okay But in one plane
4. 87 PROBLEMS frame Analog inter dialling circuits both O G amp I C circuits become one way speech after any PCM failure and restoration or Trunk BM going for stable clear Not all the circuits affected but about 50 of circuits go one way speech The circuits are in different TUs and in different cards When the TENs are deleted and added again the circuits became normal Subscriber was able to get dial tone only after tapping few times Actually out of 8 tapping dial MLF frequently occurs for duration of 2 to 3 minutes Exchange fails tone was available for 3 times Soft start was given and found OK Due to one trunk port fault exchange fails REMARKS for congestion Known problem Del create of the Trks TGPs is the only solution permanent solution will be provided later Refer Annexure 7 amp 4 Dial tone delay Look for any message on ood Report to CDOT Trunk port data is corrupted Trk to be deleted and added again 88 Some times reloading does not start Refer Annexure 10 automatically for a particular BM in an MBM exchange 7 1 5 Networking Media Related Problems SL NO PROBLEMS REMARKS 92 When a particular number is under malicious call observation Incoming STD calls from network don t mature This defect is noticed in routes having MF signalling No problem in Dec routs One minute disconnection of calls during which speech and transmission is
5. 9 9 9 9 Making IOP out of service due to lack of disk space when disk space availability goes below 5 of Total Disk space to prevent data corruption Implementation of Tariff rate of 1 314 of the Full rate and new charge rate Number for 90 sec pulse in BMDC Calling Line Identification CLI with area code sending capability WORKSHOP ON C DOT DSS PRODUCTS 17 Chapter 3 3 3 3 3 3 4 3 4 18 New Software Link 1 4 2 25 4 1997 This release supports REVENUE METERING on trunks calling Line presentation CLIP and Regional Access 90 feature in addition to all the features of software release 1 4 5 23 3 Main highlights of this release are listed below Meter counter for each Trunk group whether I C O G or B W Detail Billing for Trunk Groups put under Billing observation Centralised Automatic Message Accounting CAMA on I C Trunk Groups with MOD R2 signalling Calling Line Identity Presentation CLIP to analog subscribers Identification of the faulty subscriber port causing Terminal Tester Card TTC to go out of service CLI support across the network when C DOT Exchange is used as TAX Support for Regional Access Level 90 feature New Software Release 1 4 8 1 3 1997 This software release has been introduced for MAX XL exchanges only This includes all the features of software release 1 4 5 43 3 In addition this link supports Network Synchronisation and CCS7 sig
6. C 134 135 Phase VIII Industrial Area S A S Nagar MOHALI 160 059 Corporate Office Mr A S Gill M D C 135 Phase VIII Industrial Area S A S Nagar MOHALI 160 059 Delhi Office Mr R S Singla B 50 Anand Vihar NEW DELHI 110 092 WORKSHOP ON C DOT DSS PRODUCTS Phone 0744 424591 Extn 596 0744 426914 0744 424476 011 4360882 011 4364605 0471 418948 0471 418942 0471 320621 011 3381730 011 3388625 011 3383689 0172 677627 0172 263901 0172 670659 0172 670516 011 2202789 115 Annexure 18 For SBM RAX Only 116 Manufacturer United Telecoms Ltd Works Mrs Padma Rao Director 18A 19 Doddana Kundi Indl Area Phase II Mahadevapure Post BANGALORE 560 048 Head Office Mr C Basavaburnaiah Chairman 777G 100 Feet Road HAL IInd Stage Indranagar BANGALORE 560 008 Delhi Office Mr Rajiv Kalra General Manager Mkt Flat No 1 D White House Mandi House 10 Bhagawan Dass Road NEW DELHI 110 001 Manufacturer Gujarat Communications amp Electronics Ltd Work Mr Avtar Singh Sr Manager A 42 GIDC Elect Estate Sector 15 GANDHINAGAR 382044 Corporate Office Mrs Vilasini Ramachandran MD GIDC Industrial Estate Makarpura BARODA 390 010 Delhi Office Mr P K Duggal Sr Manager XVI 681 Gauri Bhawan II Faiz Road Karol Bagh NEW DELHI 110 055 Phone 080 5294425 080 5294426 080 5294427 080 8511176 080 8511883 080 8510728 011 33822
7. Calendar management in day type in TAX Suggestion noted exchanges automatically instead of yearly changing of day type Introduction of protection in LCC amp CCM card Suggestion noted although in MDF Due to Lightning and accidental A C surge Card damages amp Exchange collapses Automatic restoration of LCC card if Jacked out Implemented in next s w release by mistake instead of going to OOS SE 12V supply failure in PSUI is not raising alarm Suggestion Noted when the other copy of PSU also goes bad affects 128 or more subs should be modified Cannot interrogate DTKs of RSUs whether calls Suggestion Noted are 1n progress DNP DSC subs also get LLO annc presently Implemented in next s w release 0 o o dial after sometime misleading callers A separate annc Out of service required Bulk meter not shown after cre sub or del Implemented in next s w release sub required very much Rgen ictgp ogtgp do not show of success Possible Can be implemented total attempt total success cannot be used for fast analysis WORKSHOP ON C DOT DSS PRODUCTS 61 Chapter 7 No SI 25 26 27 28 29 30 31 32 33 34 35 36 37 38 SUGGESTIONS REQUIREMENTS There is no meter formatting for deleted nos i e the numbers under frozen condition Hence formatting for all numbers i e for free and frozen is required so that meter cou
8. When TGPs are kept under observation and trf Solved in rgen V 7 2 report is taken from RGEN garbage data is coming frequently 29 Repeat option in rgen command required Suggestion noted 7 2 3 System Maintenance amp Administration related Questions in QUESTIONS COMMENTS 30 Test 203 failing when connected to OCB 283 Protocol at OCB should be set equal to 2WP which is set at CDOT 31 How to confirm that 16 KHz pulse is being sent Check the tone using 16 KHz detection meter or to subscriber Often STD PT complain that they C R O are not receiving 16 KHz pulse 32 Fault code card id and fault probability clear Fault code amp Alarm code can be ignored The idea of the above may be given in documents diagnostics report displays the card id and their probability of fault w r t other cards The higher the probability among the cards the more chances of that card being faulty 33 Main hunt group member character status etc Solved in next software release are not displayed and are not able to modify their facility It has to be deleted and recreated 52 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SI 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 No QUESTIONS COMMENTS No separate arrangement for testing the Line can be tested by making OOS However it terminal card Every time eight circuits have t
9. On IOP 0 one directory number deleted for In IOP 1 in CRP prompt give commands restoring the STD facility But when Unfrz CHMOD 2 DEL SUB DIR NO GVN Dirno command given error report appears as number not in frozen list For Displ CHMOD 1 Sub command error report appears as number UNFRZ GVN DIRNO amp then CRE SUB again not assigned in ON LINE mode On IOP 1 Displ sub command shows the display of this tel no but for DEL sub command error report appears as number not assigned How to restore this no 102 DIR Number shown as a part of Hunt group Data inconsistency For correcting using datpat But actually not in Hunt group No could not be contact C DOT deleted and is unusable 103 203 test could not be done for trunk terminals Answering circuit no of distant exchange is to be filled in OG TGP against ANS INFO parameter 104 Suddenly in one route one sec Pulse received Data to be created properly With proper Solved by changing tgp category category and charge rate number 105 When a STD phone locked and mod sub char SUB OG BAR facility is to be withdrawn first given to change the access barr to local not and then only Acc Barring is to be modified to functioning Data showing up to local but subs OG UPTO LOCAL getting STD 42 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SL NO 106 107 108 109 110 112 113 114 PROBLEMS TAX calls failur
10. Preparation of E amp M cables in MBM While preparing E amp M cables in MBM exchanges care exchanges should be taken to ensure that 1st pin of the 32 pin connector is left blank The first circuit wiring should start from 2nd pin 5 2 DATA CREATION PROBLEMS SL PROBLEM REMARKS NO Proper IOP ids at the time of Both the IOPs may be loaded as IOP 0 or IOP 1 due to loading mistake This will lead to problem in duplexing the IOPs RoutinRouting to X Default 6 Routing Parameter comes into picture only for those routes for which Open Numbering Scheme has been used e g for a route 21 xxx Open Numbering Scheme has been defined and routing parameter has default value 6 then calls will not pass for this route Then value of Parameter Routing has to be changed to 5 or use close Numbering scheme At the time of creating I C TGP It is taken as prefix digit 0 For prefix NIL only default value parameter against PFX DGT is is to be given If by mistake 0 has been given instead of NIL entered 0 then delete create TGP again MF senders MF receivers should be Failure of one MFC card will result in blocking of O G calls if distributed on all the MFC cards of say 15 MF senders are created on MFC1 and 15 MF receivers TRUNK BMs in MBM exchange are created on MFC3 DTMF circuits not required Only DTMF circuits are to be MF senders Receivers are not required in LINE BMs created in LINE BMs in MBM exchange When T
11. command If above solution is not feasible then do following List all the Trk Group Nos Choose first I C TGP and make all the TENs OOS OPR Observe system for recovery If there is none then this TGP is causing it Isolate the TENs by making them INS one by one till recovery WORKSHOP ON C DOT DSS PRODUCTS 86 REASONS OF INITIALISATION DUE TO SOFTWARE RECOVERY COUNTER OVERFLOW starts again Otherwise delete the complete TGP and Create it again This way cover all I C TGP s one after the other till the trunks or TGP is isolated Del create TGP will solve the problem Once I C TGPs have been found all ok proceed to O G TGPs starting from TGP having heavy traffic Block trunks one by one to isolate the faulty terminal Then del add Trk or del cre Tgp will solve the problem WORKSHOP ON C DOT DSS PRODUCTS 87 Annexure 5 Procedure to Clear Held up Alarms Some times it has been observed that some alarms are generated and not cleared even if the fault is attended In most of the cases making that particular unit OOS and INS solves the problem In exceptional cases where it is still not cleared the following procedure can be followed i Go to the IOP5X gt prompt and create alm group using the following command on both IOPs if they are in duplex IOP5X ls PRCDATAP apalmp GRP alm grp ii Now go to crp and issue the following command on both IOPs if they are in duplex lt DEL FGP FILE alm iii N
12. 16 for implementation WORKSHOP ON C DOT DSS PRODUCTS 41 Chapter 7 7 1 7 Data Inconsistency Data Creation Related Problems SL NO PROBLEMS REMARKS 98 From STD PT subs provided on CCM card 197 and 198 are created as special routes with metering information is sent to subs office even calls made to land on some alternate directory for non metered spl service calls 197 198 but numbers While creating these directory those calls are not metered at the exchange numbers it should be ensured that field MTR directory number CLS is created with NO MTR information It is a data creation problem 99 Sometimes subs lines goes to Ad bsy or PREC N The line goes in PREC N status during creation status on its own Only part init helps to restore of subs if both copies of the TICs of that the sub s line This may be taken care of in concerned TU are OOS Please make sure that future software releases while creating the sub in a TU the TICs must be inservice 100 A TEN was free but a subscriber could not be This is due to data inconsistency in both IOPs created To solve the problem it is to be tried out in growth mode in both IOPs one by one If it is successful in any one of the IOPs the other IOP is to be brought to WARM START LEVEL and the system is to be initialised to PI level Once the system comes up the other IOP can be synchronised If the problem is not solved contact C DOT Control Room 101
13. 5 20 CM XL has been designed to support 32 BMs connectivity It will support a maximum of 16 Remote BMs RSUs CPU BPC and Memory BME Cards are used in AP amp SSC frames Introduction of High Performance CPU HPC Card and Base Message Switch HMS Card to be used in BM XL With this configuration BHCA capability of BM XL will increase beyond 25000 Introduction of High Performance Messages Switch HMS Card in Central Message Switch CMS Introduction of High Performance CPU HPC Card in AP amp SSC With the use of HPC in BP AP amp SSC and HMS Cards in BMS amp CMS the BHCA capability of MAX XL exchange will increase to 8 Lakh Introduction of Enhanced Space Switch MUX ESM Card in CM XL for 16 PCMs connectivity between RSU and Main Exchange RSU Remote Switch Unit Hardware No Hardware Difference between Normal BM and RSU except TSS Card to be replaced by RTS or ETS BM L and BM XL is to be used as A C RSUs BM L to be used for Non A c RSU No Hardware Difference in NON A c amp A c RSUs Only component packaging is different for some of the components For Non A c RSU it is Ceramic Packaging C DOT IOP VL 1995 Newly designed C DOT IOP VL in Tower type model To be used in C DOT SBM MAX L exchanges Built around only two cards and one power supply module Increased throughput Easy maintenance Cost optimisation Increased disk space of 2 1 GB against 70 or 140 MB in existing version of I
14. 98 would get appended on the data of 1 5 97 already present on the disk When detail bill records of 1 5 98 are sought to be displayed the records of 1 5 97 will also be displayed intermixed with those of 1 5 98 This will lead to discrepancies as the total calls made during the billing cycle will be less than the sum of units shown for the STD calls in the Detailed Bill for that period Thus by regular disk cleaning this situation will never arise Solution To avoid such a situation it is recommended to delete all previous files from the date of commissioning to the present date After taking back ups For example if the excahnge was commissioned in 15 7 97 and this command is being executed on 15 4 98 and it is desired to keep one month billing files then execute from CRP del fgp file bc 15 7 97 gt 15 3 98 This will delete all previous files The cleaning should be done every fortnight after taking required backup taking care that no day is left uncovered to avoid overlapping of the detailed bill records Important Keep it as a practice to regularly take back up amp delete the old files The periodicity may vary from 15 days to 3 months depending on the no of cartridges available billing cycle disk space consumption etc WORKSHOP ON C DOT DSS PRODUCTS 104 Annexure 14 Guide Lines for No of TGP s and Routes to be put under Observation Simultaneously For SBM there is no restriction on no of Routes and TGPs
15. Announcement EPROM may be bad or reloading of Announcement file required Contact C DOT These Nos must be having Dynamic STD facility earlier So withdraw Sub Og Barr from these Nos For O G trunks first put the trunks OOS OPR before wedging at MDF Using mod lin sta command make these Nos temp oos amp then Ins nrml again 44 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SL NO 122 123 124 125 126 127 128 129 130 131 132 133 PROBLEMS REMARKS TEN also the dial tone on the TEN goes off If temp oos amp then Ins nrml again new no is created the OMR is that of previous tel no resides By Changing LCC also no progress What happened to the port Alarm for LLO trunk creates frequent alarm for Small TGP Med TGP amp Large TGP threshold to a I C TGP with 3 trunks both in ADP amp OOD be changed Refer problem No 153 Any recorded announcement can be given while It is not supported at the moment changing the numbers In Trunk Traffic information the effective calls Some of the calls originated in previous report are more than the total calls in some jns period are getting completed in current report period Using Rgen Trkcdr command all calls could not Rgen to be reloaded corruption may be there be seen After some records multilated reports displayed After tgp observation for 3 hours only f
16. BM 4 do following during night hours L Force FC2 OOS BM 3 becomes critical and does not recover of its own then fault is in BUS 1 Switch off COPY 1 PSU in TSU of BM 3 Replace TSC TSS cards one by one amp switch on PSU Reset all controller cards in COPY 1 of TSU Data Loading should start Mark the removed cards as faulty 2 If data loading does not begin after replacing TSS TSC cards then fault may be in IFC 18 Force IFC2 INS BM 3 will recover Force IFC 18 OOS and replace with good card after verifying jumper setting Bring it INS ACT Again force IFC 2 OOS BM should remain stable In this case mark removed IFC18 SSM card as Faulty 3 In case BM 3 again becomes critical after replacing IFC 18 card also when IFC 2 is OOS then fault is with CMS 2 Replace MSD MSC cards in CMS 2 BM 3 should recover after data loading 4 In case loading is still not starting then it is possible that clock is not getting through First interchange SS plane If still loading not possible replace clock cable data cable of BUS 1 between TSC 1 amp IFC18 BM should recover 5 In case BM3 amp BM 4 remain stable after forcing out IFC2 then repeat the exercise by forcing OOS IFC 18 BMs should remain stable However if one of the BM becomes CRITICAL and does not recover then start diagnostics for BUS 0 fault as explained in step 1 to 4 above In this case cards involved will be TSC 0 TSS 0 IFC2 CMS 1 98 C DOT DSS FAMIL
17. C DOT WORKSHOPS SL NO 10 11 12 13 14 15 PROBLEMS Why disk space goes below minimum space What precautions to be taken to avoid this When free space becomes 0 the console will not accept any command and we have to reboot the system In u the free blocks become 0 sometimes After rebooting the blocks are raising This problem is not there after formatting Winchester 0 in IOP 1 If it occurs again which are the blocks to be deleted in which directory and in which files In 1 2GB also only 720 MB is going to be utilised why In on line mode Shell command given Core dump takes place Frequent display as medium error on drive 4 slice 0 was shown in the console Again when rebooted drive 4 was not shown Hard disk from one spare IOP was changed Within 2 days the same problem repeated and original hard disk was changed The declared faulty hard disk was found to be ok at another site All occurred within 10 days IOP is going to disbl upd opr or disbl upd All at times Morning alarm failing frequently and only restoring after deleting and recreating If the operator terminals main RSU are connected on IOP frequently the IOP starts hanging This problem is being solved by bringing the IOP to warm start level from power off state and then synchronising with the active IOP If another RSUs are added IOP hanging problem appears again After changing the status of
18. City Unit Works Mr K K Sundaram General Manager EC 18th Km Hosur Road Hebbagodi Post BANGALORE 561 229 Corporate Office Air Comde S S Motial Retd CMD 45 1 Magrath Road BANGALORE 560 025 Delhi Office Mr Mahesh Chandra Executive Director I Floor Core No 6 Scope Complex 7 Lodhi Road NEW DELHI 110 003 Instrumentation Ltd Works Mr A S Lodha 011 670117 011 6172678 044 2326171 044 2328791 to 98 044 2341589 044 2321589 011 5712201 080 8520163 080 8520080 Extn 260 080 8520475 080 8520969 080 5566366 011 4360555 011 4368685 011 4362385 0744 421171 0744 423381 C DOT DSS FAMILY LIST OF APPROVED C DOT MANUFACTURERS Manufacturer GM Telecom Jhalawar Road KOTA 324 005 Corporate Office Mr N K Sinha CMD Jhalawar Road KOTA 324 005 Delhi Office Mr G C Goel Sr Manager Mkt Core No 6 7th Floor Scope Complex 7 Institutional Area Lodhi Road NEW DELHI 110 003 Kerala State Electronics Dev Corpn Ltd Works Mr N Ravindranath Exe Director Communication Division Switching Eqpt Unit Keltron Equipment Complex Monvilla Kulathoor P O THIRUVANANTHAPUAM 695 583 Corporate Office Mr Satish Kumar Managing Director Keltron House Vellayambalam THIRUVANANTHAPURAM 695 033 Delhi Office Mr T G Menon GM Travancore House K G Marg NEW DELHI 110 001 Punjab Communications Ltd Works Mr Dinesh Sharma AGM HOD Switching
19. OOS SUS unnecessarily putting load on system software 7 Deletion of Ed While cleaning of the disk ed group should never be deleted WORKSHOP ON C DOT DSS PRODUCTS 27 28 o o ND 11 12 Chapter 6 Do s and Don ts w r t S W Release 1 4 Check the status of the system daily by using crp command displ sys all Check the Disk space on both the IOP s daily by giving command iopox df It should always be more than 5000 blocks in data If it falls below 5000 blocks then do disk cleaning using crp command del fgp file for tf trnsf bc and ioh groups after taking the backup for bc If one of the iop is required to be brought down to warm start use command init iop 2 1 Do not execute the DGN SWU command with the parameter RPT OPT Y Always use default values Do not give tst trm for different type of trunks OG IC amp BW at the same time in same command Do not remove floppy cartridge drive till the LED is glowing For satellite exchanges the charge rate number used should have ini crg as 0 Modify day type on every Jan 1 and July 1 using command mod day typ Take backups ed amp bd daily bc fortnightly Do not remove Integrated Protection Module IPM s from the MDF for working numbers All IPMs should be properly grounded Modify the system parameter min subs dials to a value less than the exchange digit length smallest route length whichever is less If exchange digit length is 5 and one route lengt
20. RAX This Modem has a RS 232C link with the Maintenance Panel on the 256P RAX The COMaC can thus initiate a telephone call to from 256P RAX Modem and can thus interact over the telephone lines with the RAX Administrative Processor RAP via the Maintenance Panel The major advantage of this approach is that while local operations can be done through the Maintenance Panel as usual the COMaC facility can also co exist Normally it is envisaged that the COMaC will be located at a strategic location typically district HOs and will dial up the 256P RAX s in the vicinity However it is possible that the COMaC PC is located physically in the same room building as the 256 RAX Given such a situation the use of 2 Modems 2 telephone lines and a telephone call is totally unnecessary Hence the COMaC software also supports a C DOT DSS FAMILY 8 4 ENHANCEMENTS FROM C DOT local mode of connection over a Null Modem Cable between the COMaC PC and the Maintenance Panel of this 256P RAX The Centralised Operation Maintenance Software resides in the PC and also in the Maintenance Panel in the RAX The PC COMaC Software runs over MS DOS and provides a interactive and user friendly environment for the operator The Maintenance Panel COMaC Software has the primary function of passing messages received from the COMaC PC towards the 256P RAX administrative processor and sending responses obtained from the RAP towards the PC REMOTE SWITCH UNIT RSU The
21. Related Miscellaneous Software Related Data inconsistency Software Recovery Overflow i Miscellaneous Down Due to Software Due to Hardware Due to Power Exchange Networking Information C DOT DSS FAMILY POST CUT OVER MANAGEMENT SUPPORT FROM C DOT CALLS ATTENDED AT CONTROL ROOM Jan 97 Dec 97 Total Problems Attended 6215 MSC 14 SOFTWARE 19 5 HARDWARE B SOFTWARE PROCEDUREAL MISC Fig 2 2 WORKSHOP ON C DOT DSS PRODUCTS 11 3 1 3 1 1 12 Chapter 3 Hardware and Software Status 256P RAX Software Release 1 05 Three basic configurations A B and C were standardized for different applications Till Sept 1997 all the RAXs were being despatched to sites with software release 1 05 Some Field problems reported from different sites in V1 05 are listed below Meter spurts For 1 intra RAX call after power on in case of copy change over during the call Irrelevant announcement tone after copy switchover during tone announcement phase Trunk offer not successful after diagnostics on conference card Conference after trunk offer is through only for one unit period when intra call rate is other than unit fee Different announcement is fed for blocked LLO subscribers for Local amp MF trunk call Slot 02 08 amp 02 09 cannot be given as start end addresses for RTC calendar driven tests DCR Print out by date amp month not possible for Feb 29 RTC fault amp RM
22. Since it is only a 7 digit display identifying calling no is not possible How to eliminate the STD code or How to change the no of digits Detailed billing is to be issued to all subs centrally from TRA For this the BC cartridges are taken from C DOT and the NCBR files are downloaded in a PC and the printouts are generated There are few problems in it The utility BF is used for downloading to PC This works in PC of lower version i e upto PCAT 386 only This takes lot of time and very difficult The BGS software is used for taking output This has got some drawbacks Is there any other utility for this How to calculate local call success rate While creating TGP if is given for TGP NAME it is not immediately saying as invalid input After execution it is showing error While retrofitting from 8 9 to 5 43 all the nos in the frozen list were found to be unfreezed what should be the precaution Even after changing the control cards getting one pip tone at equal interval during that time speech is disturbed when the conversation is going on For a particular subscriber for MOD SUB TEN command the meter reading getting changed COMMENTS Creation of answering cct possible For any clarification contact C DOT DTK goes to OOS Trans due to media flicks Check Media stability Not affected by temperature Modify Sys param gt Num Ani 10 And reset MFCs and then force OOS INS Hardw
23. TAX So at such sites where C DOT MBM exchange exists it will be prudent to include SBM TAX in the MBM exchange itself as a Trunk BM As there are other trunk BMs also in the exchange it will be possible to regulate the traffic on each trunk BM This exercise will result in following surplus material 1 IOPs Two 2 ADP 3 OMA 4 Iron work material The procedure to install one additional BM is already available After the addition of this BM the MAX exchange can be converted into an ILT to cater for various routes on Level 0 All such routes on which charges are to be differentiated will be created in this exchange and for all such routes where the charges are same will not be analysed in this exchange However it will generate charging for all level 0 routes The procedure to convert MAX into ILT is supported with a separate document CENTRALISED EXCHANGE MAINTENANCE SYSTEMS CEMS Centralised Exchange Management System CEMS is a PC based software package developed by C DOT for monitoring the C DOT SBM MBM Exchange from a Central Network Management Centre thus reducing the maintenance cost and facilitate better planning and dimensioning of the network The CEMS functioning as a Remote exchange Maintenance Centre consists basically of a PC connected on a telephone line through modem The CEMS software will be residing on the PC AT All the C DOT SBM MBM exchanges in the vicinity to be controlled will also have a Modem connected
24. W Link 1 4 One of the probable cause of BM going for repeated initialisation in 1 4 S W is the corruption of announcement data Recovery type shown on BP terminal is Code 175 with parameters 172h Oh 601h In such a case do following 1 Unequip and equip Annc Card in on line mode using crp commands uneq srv card and equip srv card in the affected BM or SBM Put SWU INS for ANNC 2 On active IOP check following IOP5x gt conp conp gt m x where x 2 BMNo 2 MDEB x gt md 474ad0 In case of MBM OR gt md 592b5c In case of SBM Note down 1 four bytes If first four bytes show xx000900 where xx is logical BM No then this is correct If first four bytes show xxffff00 then this is corrupted Modify these bytes using MDEB x exm l 474ad0 For MBM OR gt exm 592b5C For SBM WORKSHOP ON C DOT DSS PRODUCTS 90 BM GOING FOR FREQUENT INITIALISATION AT SBL CLR LEVEL IN S W LINK 1 4 Press space bar and type xx000900 Give Return amp Type MDEBx ex CONP gt ex to come to iop5x gt prompt 3 Give following command in crp mod annc tone BM No 2 x where x varies four 1 to 32 SW mapping fac na annc fac na annc OOS mapping fac na annc nut 4 mod sys param fac na annc 450 5 Then verify Announcement This facility is not available on this Number by dialling STD No from a NON STD subscriber No belonging to SBM affected BM WORKSHOP ON C DOT DS
25. amp 2 WORKSHOP ON C DOT DSS PRODUCTS 111 Annexure 18 List of Approved C DOT Manufacturers For SBM RAX and MAX XL Manufacturer Phone Fax Bharat Electronics Ltd Works 01382 31112 091 1382 Maj V S Rawat 01382 31171 31132 DGM D amp E to 78 091 1382 Govt of India Ministry of Defence Enterprise 31156 Balbhadrapur Kotdwara Distt PAURI GARHWAL 246 149 Corporate Office 080 222626 Dr V K Koshy CMD Trade Centre 116 2 Race Course Road BANGALORE 560 001 Delhi Office 011 4360706 Mr R K Maratha 011 4360705 DGM CM Scope Complex Core 6 Floor 6 Lodhi Estate NEW DELHI 110 003 Bharat Heavy Electricals Ltd Works 080 6610153 Mr V K Bhatnagar 080 6998210 General Manager 080 6674297 Mr N Sabesan 080 6998447 Product Manager Telecom Electronics Divn EDN P B No 2606 Mysore Road BANGALORE 560 026 Corporate Office Delhi Office 011 6493008 Mr K G Ramchandran 011 6493031 CMD BHEL House Siri Fort Rd NEW DELHI 110 049 Crompton Greaves Ltd WORKSHOP ON C DOT DSS PRODUCTS 112 LIST OF APPROVED C DOT MANUFACTURERS Manufacturer Works Mr G Govindappa Vice President Public Switching amp Transmission B 2 KEB Layout I Main Bannerghatta Road BANGALORE RURAL 562 106 Corporate Office Mr K K Noharia MD 1 Dr V B Gandhi Marg MUMBAI 400 001 Delhi Office Mr Manjeet Singh Vice President Vandhana Bldg 11 Tolstoy Marg NEW DELHI 110 001 Electronic
26. calls failed on a particular route But it is not possible to get revenue per route 104 What is the maximum concentration possible Is Software wise we can get a maximum of 4 1 it possible to get 6 1 concentration concentration But if trunks are distributed across TUs and then software wise it is equipped with 4 1 concentration then practically it will result into higher than 4 1 concentration Say a DTU with 2 PCMs equipped and concentrated with another 3 TUs with lines then for 64 time slots there are 384 subscribers leading to 384 64 or 6 1 concentration 105 Details of Alarm Sequence Number ASN not Full details are available in document Alarms available and Reports in C DOT DSS MAX 106 The status of 3 4 6 8 party conference facility in Till S W release 1 4 5 43 3 only 3 party C DOT conference is possible for which CNF card not required In the next S W release 2 1 1 1 4 5 6 party conference will also be provided using a CNF card 8 party conference is not to be provided 107 Test set nos with there applications for LCC Complete information is available in Document Trunk Cards Service Circuit and DTKs should Maintenance Procedure or Maintenance be available Commands 108 What is utility of init sys init mod command Most common init type options for system 58 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SI No QUESTIONS COMMENTS with various init typ optio
27. card to be replaced Refer Maintenance Procedure Document for fault tracing TIC TUI card problem Replace these cards Try by replacing active TIC cards TSM TSI of TSC 1 to be replaced Check TUI of TICO5 0 WORKSHOP ON C DOT DSS PRODUCTS 35 Chapter 7 SL NO 50 51 52 53 54 55 56 57 58 PROBLEMS In Mundakayam SBM 5 23V TIC concentration Ti 13 14 15 16 Ti13 0 OOS EXT When we diagonise Ti 14 0 15 0 16 0 it failed We changed with ok cards Again failing After so many trials we just made Ti 13 0 OOS OPR and diagnosed It was ok Then we diagnosed other three and found ok What can be the reason TUC card in TU 1 of LM2 with TIC ids TI02 0 and 1 TI02 0 is INS TI02 1 dgn is ok but going to OOS SYS changed cards but same report It is observed that suddenly the exchange will go down after about 100 seconds the load pass report will come as SOFT START Error Data comparison in RW area At this time no alarms will be there on ADP Diagnostic report is taken on MUO amp MUI it is ok So what may be the problem amp what is the solution for this One BM RSU is working with 4 PCMs ICs in RTS cards getting faulty after some period Even IC chips are faulty PCM status getting INS ok but complaint receiving getting parking tone The only way to put right the PCM by trial and error by putting the ok IC chips in RTS card Ring is not extended to the su
28. connected with SBM Mux jumper setting problem details can be through PCM i e SBM end Analog basis and obtained from CDOT control room or MUX CDOT 256 End digital stream basis only one specialist in DOT can be consulted way call establishment SBM to 256 But 256 to SBM call failing WORKSHOP ON C DOT DSS PRODUCTS 63 Chapter 7 SI No 8 10 11 12 13 14 15 16 17 18 PROBLEMS In 256 RAX some local nos like 32722 293129 62333 47122 are not getting on IC jns When a subscriber hardware type is given as CCB instead ordinary line with non home meter in LCC card position and unit fee is given then for long distance calls only one unit is advanced When continuous home meter is given then only multimetering is possible This gives scope for loss of revenue Numbers of E10B exchange with malicious facility are not getting for CDOT 256 when CLI sending request is given in a route When CLI sending disable is given then numbers are able to get In MF Indian R2 signalling 180 is unget from CDOT 256 via SBM512 getting the same when decadic is given In other 256 exchange if we give call queue facility to a sub caller gets announcement that he is in queue and the called subs gets indication tone When the called subs puts off his handset he is getting ring and the caller getting still announcement instead of ring back tone When the caller lifts handset he neither
29. digital connectivity to the network it is being felt strongly by field officers to upgrade the existing 14 000 C DOT 128P RAX to C DOT 256P RAX This need has long been recognised by C DOT and thus developed 256P RAX exchange which besides having larger capacity to cater to rising demands for connections presents graceful solutions to demanding requirements which were not present in C DOT 128P RAX An upgradation strategy will thus have to satisfy the following requirements e To provide all the subscriber features and interfaces available in C DOT 256P RAX e g DTMF dialling MF and digital PCM signalling schemes dynamic service restrictions detailed billing records digital PCM trunk interfaces etc e Minimum cost of upgradation i e minimum new equipment requirements and economic utilisation of old equipment e Minimum disruption of services as the exchanges will be in service at the time of upgradation e Flexibility of future capacity expansion The 128P RAX can be converted into 256P RAX by installing the master frame of the 256P RAX unit in the lower slot of 128P RAX cabinet The existing 128P RAX card frame can be used as a slave frame All these modifications will be carried out at site While converting 128P RAX into 256P RAX certain cards and assemblies WORKSHOP ON C DOT DSS PRODUCTS 70 ENHANCEMENTS FROM C DOT will go waste and certain new cards assemblies cables mechanical components and add on units will be requi
30. existing sites 3 4 1 SBM RAX MAX L Hardware New version of TIC Card APC TIC002 F S10 introduced to take care component obsolescence ISP Card ASIC Design introduced replacing SPC card to increase reliability Remote Time Switch RTS card introduced to be used in place of Time Switch Switch TSS card for RSU BM This card supports 4 PCMs 2 PCMs per BUS connectivity between RSU and Main Exchange Introduction of Enhanced Time Switch ETS card in place of RTS card to support 16 PCMs 8 PCMs per BUS connectivity between RSU and main Exchange Introduction of Remote Switch MUX RSM card in place of Space Switch MUX SSM card to be used in CM L corresponding to RSU BM RSM Card provides interface for one RSU BM and one colocated BM and supports 4 PCMs 2 PCMs per BUS connectivity between RSU and Main Exchange Introduction of Enhanced Space Switch MUX ESL Card in place of RSM unit to be used in CM L for 16 PCMs 8 PCMs per BUS connectivity between RSU and Main Exchange 3 4 2 MAX XL Hardware New CPU Card in Base Processor Unit BPU as APC BPC 441 0 S02 BIC Card will not be required with BPC New Memory card of 16 MB as APC BME 442 H S02 in which BID Card has been merged With this configuration BHCA handling capacity of BM XL will increase to 12500 BM XL RSU Same RTS ETS cards will be used for 4 PCMs 16 PCM connectivity respectively WORKSHOP ON C DOT DSS PRODUCTS 19 Chapter 3 3 4 3 3
31. gets speech of called nor dial tone 256 CDOT test 1 test 2 fuse blown display is coming even though fuses are ok in RTC card In 256P RAX in case of CRI F calls getting disconnected after 60 sec in case of routes having charging pulse of 90 sec In 256P RAX metering stops after few hours on trunk routs When system is initialised metering starts again for few hours One 256P RAX is being used as Group Dialling Exchange amp connected to Two 256P RAX and three 128P RAX exchanges For group dialling level 8 is being used For STD access to 256P RAX exchange level 0 has also been opened on same TGP Now 256P RAX subs started getting STD routes by dialling 80XXXXX How to avoid this Both copies work OK in simplex mode but do not come in duplex In 256 RAX exchange having S W 2 1 1 amp connected to SBM RAX 5 43 S W through SOLUTIONS GET AROUNDS This problem is solved in 2 1 1 S W Problem solved in S W 2 1 1 Solved in S W 2 1 1 In case of sending CLI on a TAX route Self TAX Code must be defined Problem solved in 5 43 SBM MBM and 2 1 1 RAX S W Solved in next s w release Solved in s w 2 1 1 In latest S W 2 1 1 this time out feature of 60 sec has been removed thus the problem has been solved Problem not repeatable in Lab This is basically result of wrong data creation Vary first thing O G TGP between 256P RAX to GDC 256P RAX should have ROD 1 only In case of 12
32. in correct manner Whenever PCM is going to OOS TRANS and when the PCM is right the O G jns are not becoming OK by automatic We have to make OOS OPR and OOS INS In the above condition calls on this route are getting parking tone Digital trunk goes OOS trans alarm in ADP or on OOD after media becomes ok Earlier this problem was there due to E10B TAX not supporting ANI signal Now this problem has solved due to upgradation of E10B software When signalling is Decadic then ANI will not be asked at all So calls are OK Solved in S W 5 43 Reversal Not received Check for answer condition at media point Solved in 5 43 OOS TRANS JNS will be restored to INS NRML after 20 minutes if media becomes OK Self restoring after media becomes ok in S W version 1 4 5 43 3 40 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS EG PROBLEMS REMARKS 93 If a no is kept under obs for malicious calls Signalling problem level a I C calls from other electromec exchange CLI not supported properly in X bar exchanges will be effective a TC calls from x bar exchanges get disconnected immediately 7 1 6 Lightning Related Problems bo PROBLEMS SOLUTIONS GET AROUNDS 97 Many MDF fuses blow up due to lightning and sometimes Components in the LCC cards are also getting faulty SBM 8 9 Due to lightening during the monsoon particularly PSU TIC LCC SPC TUI MEM BID PSUIII cards are a
33. in one of the BM 1 4 conc between TU7 and 8 observed one way speech The TICs are diagnosed ok The probability of fault may be analysed A flow chart for tracing fault in CM for inter BM call failure and one way speech Ring not passing but on lifting conversation okay Getting muffled speech some times one way speech irrespective of subs Nos DGN pass report while diagnosing the TICs individually In Pattukottai SBM 1 TIC16 amp TIC13 of 1 copies are always in OOS SYS Unable to bring INS If we try for INS after certain period it become OOS SYS DGN was done for the cards which is ok What is the problem How to put them INS When TSC 0 is active Ti06 Ti07 Ti08 0 are getting inservice standby But if they are made as active above said Ti going OOS SYS But as TSC 1 active T1106 Ti107 Ti108 are going OOS SYS Dgn SWU for TSC 0 TSC 1 is OK Dgn Swu for Ti on TSC 0 active passed But on TSC 1 is failed REMARKS This is observed sometimes due to transient faults or in a particular case TUI card may work at the 4 place of concentration but may fail at any other place Check jumper setting as per position Swap memory cards Conduct DGN for card Otherwise do dgn by replacing individual mem cards Refer Annexure 12 PSU II child card ECN should be implemented at few sites For details contact C DOT There may be problem in TU motherboard TIC fault only DGN will not test all links TIC7 TIC8
34. only Give reset to all the controller cards of TSU Wait for data loading to start BM will recover after SBL CLR In case BM3 has not recovered by action under A then there can be following possibilities 1 Check S W status for IFC2 and IFC18 In case one IFC say IFC18 is OOS SYS then BUS 1 is not through that time 2 In BM 3 TSC 0 TSSO cards are faulty or clock data cable of BUS 0 between TSC 0 amp IFC2 is having some fault or IFC2 itself is fault for BM3 only Any one of these faults will make the BUS 0 connectivity between BM 3 amp CM ineffective Thus the result of 1 amp 2 will be that BM 3 can not go for loading at this time 3 In this case it is possible that CMS 1 MSC MSD is faulty ACTION REQUIRED Force IFC 18 card INS ACT thus making BUS 1 through between TSC 1 amp IFC 18 Loading of BM 3 will start immediately and BM 3 should recover after SBL CLR Then during slack hours of traffic BUS 0 connectivity between BM 3 and CM has to be ensured by replacing one of cards viz TSC 0 TSS 0 IFC2 CMS 1 BM 3 does not recover by actions taken under B then switch OFF ON PSUs in BPU frame Give reset to BP 0 amp BP 1 and let BM 3 go for code patch data loading C DOT DSS FAMILY Annexure 7 PREVENTIVE MAINTENANCE FOR ALL THE BM s IN MBM EXCHANGE To avoid such situations at random preventive maintenance will be useful and should be carried out for all the BMs one by one Taking example of BM 3 amp
35. procedure for Disk cleaning e g ioh trnsf bc tf groups giving appropriate date options in bc amp tf Also run utility cre space in both the IOP s As far as possible synchronise the IOP s during slack hours 1 After giving put swu ins command from Active IOP message synchronisation of IOP begins does not appear on console terminal and process creation does not start on OOS IOP then most likely HDL card of one of the IOP is faulty Try by replacing HDL card first in OOS IOP and then in Active IOP WORKSHOP ON C DOT DSS PRODUCTS 92 IOP SYNCHRONISATION FAILURE CAUSE amp REMEDIES Process creation has started on OOS IOP 4 lines but synchronisation of IOP begins message does not appear on ACT IOP console then verify s w loaded in the IOPs These may be different 2 Synchronisation of IOP begins has appeared but sync is getting aborted in step 0 itself i e sync over for step 0 is not coming Do following Run utility cre space in Active IOP If cre space is not available then give commands IOP5x gt cd TEMP IOP5x mvoodlogDD noodlogDD where DD stands for current date IOP5x rm oodlog result IOP5x mv noodlogDD oodlogDD IOP5x gt gt oodlogDD DD is current date Shutdown and Reboot ACTIVE IOP using init_iop 2 1 amp init iop 1 1 then make it INS ACT init IOP 5 1 start synchronisation again put swu oos put swu ins 3 Sync Abort in step 1 Note down the
36. to Circuit supervision activity call failure due to kill call command Failure due to Call Waiting at the calling party C DOT DSS FAMILY Annexure 11 19 CALL WT IND TM OUT 20 CHNGD NUM ANNC 21 CHNL CONGESTION REMOTE 22 CHNL CONGESTION 23 CLLD BNP OOS 24 CLR IMM PRTY A 25 CLR IMM PRTY B 26 CONCKT 27 CONG TRNK 28 CONGN LN GRP 29 CONV TM OUT 30 CP BSY 31 CSH TM OUT 32 DBE 33 DT TM OUT 34 DUAL SEIZURE 35 FAC N IMP 36 FAULTY CKT 37 FL AS DIVERSION NOT POSSIBLE 38 FTR CNCL 39 FTR INTERACTION 40 FTR INVC 41 FW SGN PRMNT 42 IDT TM OUT 43 INV INVC 44 INV SGN 45 IW CODE 46 JN FAULTY 47 KIL TRK L2 48 KIL TRK LL 100 Call waiting Indication time out Changed Number Announcement Failure due to channel congestion at RBM Failure due to congestion in Channel in DTK for origination at RBM Called Party OOS due to Bill not paid Clear Immediately Party A Clear Immediate Party B SHELJA Conference circuits Congestion on Trunk Congestion in Hunt group Conversation Time Out Subscriber CP Busy Called Subscriber Held Timeout Dial By Eqn Dial tone time out Dual Seizure of a trunk Facility Not Implemented Faulty circuit Diversion not possible Feature cancelled Feature Interaction Feature Invocation Forward Signalling Absent Inter Digit Time Out Invalid Invocation Invalid Signalling Wrong Prefix Digit Junction Faulty Killer trunks
37. to be kept under observation simultaneously For MBM following table indicate no of Routes and TGPs that can be put under observation simultaneously p 0e IT s 3 9m to 39wem 9 o wss wem 9 ee 1 7 198998 E ME tos do ooo 3 pr EE e 0 p ooo3Gm E p ooo 039 T oes 9 O a S S E 0039 399 9 E uum d 105 C DOT DSS FAMILY Annexure 15 Limits for Subscriber Line Parameters The limits of insulation resistance loop resistance and capacitance for different line categories of subscribers are shown in the table below The line category of the subscriber has to be assigned depending on the values of insulation resistance capacitance and loop resistance These may vary depending on the instrument connected Normally category 2 can be used for DTMF instruments The default limiting values for different categories are listed below Insulation Resistance Low in Insulation Resistance High in Category kohms kohms b amp gnd b amp gnd 20000 20000 20000 20000 20000 20000 6 20 o o 2000 20000 20000 Contd WORKSHOP ON C DOT DSS PRODUCTS 106 LIMITS FOR SUBSCRIBER LINE PARAMETERS Category farade Amps ohms LOW LOW LOW 15 so o so 100 240 Note If external voltage on the line is more than 5 99 volts no other tests will be conducted Limits for Dial Te
38. trunk conditions are not controllable then these limits can be raised for Small amp Medium TGP by modifying system parameters Value against these parameters indicate of trunks being faulty This is as per implementation At any time 4 counter files are available in the IOP During formatting last but one counter file is formatted As a result meter reading given by report bill cntrs may be older by one to two hours Problem is already reported from some sites having TME cards amp can be corrected with the help of C DOT WORKSHOP ON C DOT DSS PRODUCTS 47 Chapter 7 EG PROBLEMS REMARKS 152 When BP interchange is given in SBM Problem has been solved by changing ADP exchange ADP goes OOS SUS and recovers EPROM New checksum 8CE2 153 For PSU failure no alarm indication coming on System parameter COD ALM should have OOD Printer Although alarm is coming on value 1 ADP Recreate process AOOD by giving following commands IOP5X ps ef grep aood Note down value in 2 4 column Next to root in the display Root xxx aood mai IOP5X gt kill 9 xxx Now process aood will be recreated Press Return 7 23 INFORMATION RELATED QUESTIONS ON SBM MBM 7 2 1 IOP Related Questions QUESTIONS COMMENTS 1 Is there any other way to increase the blocks e C DOT has developed a utility which takes other than tf trnsf ioh bc care of deletion of all such fil
39. used only in IOP VL and not in IOP L M But cartridges prepared in IOP L M are compatible in both IOP L M as well as IOP VL Always keep it as a practice after copy out to read the tape as the other IOP by DISPL TAPE INFO command WORKSHOP ON C DOT DSS PRODUCTS 49 Chapter 7 QUESTIONS COMMENTS When copy in command is given the Disk space can be checked at Unix prompt availability of free blocks in the disk is to be before loading the cartridge checked before copying onto disk Give command dioa TOPSSSDrOmpE IOP5x gt df This will display four lines as shown below u dev dsk m320_0S6 90096 blocks 8601 i nodes data dev dsk m320 0S5 172398 blocks 102658 i nodes code dev dsk m320 0S1 128686 blocks 10254 i nodes dev dsk m320 0S0 6020 blocks 7501 i nodes The blocks shown under 3 1 field denote the free blocks available in the particular directory show under field 1 e g from above we can find that 172398 blocks are free in data directory Note Above display has been taken from IOP L M having single disk of 520 Mb capacity In case of 70 Mb hard disk the free disk space shown will be quite less Ensure that the free space available is more than the block size of the tape to be copied But the actual requirement may be much less than the Block size of the tape in case of I ED ii BC or BD which is already available in the IOP is full or past In some cases while reading cartr
40. 12 011 3382213 02712 23244 02712 21630 02712 22919 0265 643521 0265 643121 011 7513320 011 738085 091 2712 21629 C DOT DSS FAMILY
41. 8 P RAX there should be no digit suppression on direction X The problem could be either in RAP card or motherboard itself Problem under observation 64 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS 19 20 21 22 23 24 25 26 SI No PROBLEMS TWT trunks few channels get blocked every day I C call on trunks not landing on sub No DE333 when DE is EXCH CODE When a local call is established a beep is heard by the caller during conversation During beep sound speech is clipped All the subscribers getting STD although subscribers parameter showing STD Not Allowed For TAX calls Level 0 STD counter not updating but Bulk Counter getting incremented OG restriction dynamic STD facility not working for a particular subscriber Trunk offering facility not working in 256P RAX How to replace an RAP card Suppose a standby RAP card is to be replaced amp second RAP card to be put in the system to make it duplex Excess metering cases reported SOLUTIONS GET AROUNDS Solved in S W 2 1 1 In case of S W version 1 05 verify mode of local metering AUX 2 3 It should show 0000 If it is other than this change it This problem has been solved in S W version 2 1 1 This a case of wrong data creation If direction 0 is opened with 1 digit analysis then barring will not be possible on any no Reconfigure directio
42. C DOT DSS FAMILY WORKSHOP ON C DOT DSS PRODUCTS Table of Contents Chapter 1 H HOME GEN WORD DSSWRK98 DOC October 20 1998 Chapter 1 Introduction C DOT has conducted about 30 Workshops in various Telecom circles from September 97 to December 97 The objective of the workshop was to introduce the Regional access 90 feature in 256P RAX SBM and MBM exchanges and discuss other new features available Each workshop was followed by a practical training session in various exchanges The software upgradation procedure both for 8 9 and 5 23 existing software in SBM MBM and for 1 04P amp 1 05 in 256 RAX were also demonstrated to a group of officers nominated by the circle This training helped these officers to carry out the job in other exchanges Workshop also covered presentation on new features like common channel signalling CCS7 Network Synchronization and Enhanced Subscriber Unit ESU Software highlights of Rel 5 43 field problems MAX to ILT conversion SBM to RSU conversion and software tools like BMON COMaC RGEN and CEMS were also discussed The list of sites and number of participants is given in Table 1 The objective of this document is to put all such things which were covered in the workshop so that it can be circulated to all such users who could not attend the workshop This document has been organised to cover Post cutover management supports available from C DOT in Chapter 2 In Chapter 3 current hard
43. Duplex WORKSHOP ON C DOT DSS PRODUCTS 33 Chapter 7 SL NO 32 33 34 35 36 PROBLEMS OOD terminal not working OK even after killing existing PID of AOOD seen through ps ef command Printing of meter reading for more than 100 subscribers not possible at a time When interchange to IOP is given one of the IOPs goes OOS SYS Noise is observed in TWT trunks while changing the SS plane In TST TRM que position showing as 255 but result coming Why que is shown as 255 REMARKS Check VDU terminal functioning by putting it on console IfVDU amp cable is OK and AOOD process has been recreated then fault is most likely with SIO card in IOP L M or VDE card in IOP V L These cards can be changed in power off mode and IOP may be rebooted to make it INS ACT In S W release 1 4 1 3 modification for printer cable has to be done After doing this it is possible to take printout for all the subscribers Refer Annexure 9 Either TSC SSM SSS may be faulty This is a dummy number so ignore it till IOP working fine 37 Not possible to take list of subscribers who Solved in 1_4_5 43_3 s w comes under NO ORG sub facility In displ sub list org fac option no 1 is NO ORG But we give that option system displays all subscribers of the BM NO ORG option not provided in RGEN SUB FAC 7 1 2 Hardware Related Problems SL NO PROBLEMS REMARKS
44. F faults during RTC calendar driven tests at times MF transit calls on linked level land on RAX subscribers of block 2 and 3 if the last 3 digits are same DT30 channels I C to RAX from E 10B get blocked amp can be released from RAX end only Calls on TAX directions having 90 seconds tariff getting disconnected from RAX side C DOT DSS FAMILY HARDWARE AND SOFTWARE STATUS 3 2 NEW SOFTWARE RELEASE 2 1 1 1997 Software version 2 1 1 for 256P RAX was introduced in September 1997 to overcome various field problems mentioned in para 3 1 1 In addition this new s w release supports REGIONAL ACCESS on route 90 3 2 1 New Features in V2 1 1 w r t V1 05 Detailed Billing and Detailed Call Records DCRs for Trunk Groups DCRs are now available for I C O G and transit calls on TGP s Printouts of records can be taken for I C TGP s O G TGPs Modifiable Super User Password Each exchange can have a unique Super User Password and thus providing a higher database security Separate counters for superuser login and number of superuser password changes have been provided 7 levels of dynamic OG restriction available to facilitate regional access Special Treatment for route 90 90 can be programmed as regional STD route Regional Access falls between STD and Local access in hierarchy DCRs will be generated for 90 calls along with STD amp ISD Dynamic O G Restriction facility possible for subs having access
45. GPs are created with E amp M Otherwise E amp M trunk testing may not be possible because of circuits first four TENs of the slot is unavailability of trunks to be used in I C TGP and last four TENs for O G TGP or vice versa While creating a route other than 0 Open Numbering scheme should be used only for route 0 default value of digit length 16 Other routes should be opened with closed numbering should not be given scheme Charge rate numbers not defined Satellite exchange should have charge rate numbers with ini properly charge 0 For self exchange subscribers category 1 charge rate numbers allocated should have ini charge 1 In charge rate numbers ensure that Specially Charge Rate numbers 1 and 40 which are used for ring info column should have TAX calls should have ring information as normal otherwise normal ring except for special TAX junctions will remain busy for no reply calls for 4 services minutes 0 While creating trunk group dial If it is not defined for other routes also than it will tone parameter should be no except unnecessarily load the exchange software for trunk operator trunk group 11 Trunk group category should be Same conditions holds good for other routes also defined properly For I C TGP of 26 C DOT DSS FAMILY KNOWN FIELD PROBLEMS PROBLEM REMARKS TAX it should be allowed while creating RAX routes Otherwise calls from TAX to RAX will not pass DTMF instruments sho
46. ID cards BIC card merged in BPC card and 4 memory cards and one BID card merged in BME card Supports different version of IOPs Old version of C DOT IOP with 70 or 70 70 MB disks and 2 MB or 8 Mb memory cards Existing version of C DOT IOP VL New version of C DOT IOP VH C DOT DSS FAMILY HARDWARE AND SOFTWARE STATUS Exchange Operations Enhancements 1 4 1 3 Exchange code modification to a new exchange code with the same or different code directory number length Unequipping of an already equipped frame is possible by using CRP command On line mapping of tones amp Announcements as per requirement Enhanced sets of Audits for better resource management Terminal privileges are implemented for operator terminals ILT TAX Features 1_4_1_3 X x Semi compelled MF signalling for satellite channels International CCITT R2 signalling Increased number of routes Max 2048 Increased number of trunk group categories Max 64 to support enhanced requirement of routing charging Increased depth of analysis for route codes Max 12 digits Increased BHCA handling by shifting the task of metering to peripheral hardware units TIC TUC Call Routing Tone for DECADIC routes Creation of TGP by name 10 ASCII characters 3 digit as well as 4 digit level 1 routes supported Operator Assistance position 111 supported for Network call Metering Billing Enhanceme
47. NTATION IN C DOT SBM MBM AND 256P RAX The Hierarchy of Access Barring OG UPTO 10X OG UPTO LCL OG UPTO REG OG UPTO NAT OG UPTO INT All subscribers having ACC BARR as OG UPTO REG and above can access level 90 Subscribers with Access Barring OG UPTO 10X and OG UPTO LCL cannot access Level 90 For activation deactivation of this facility service code is 45 Detailed Bill Records will be maintained for level 90 calls along with level 0 00 calls 4 1 3 Data Creation for Regional STD Level 90 4 1 3 1 Data Creation in SDCA as Local Exchange 1 2 3 4 Verify that system parameter XCHG TYPE is having value 2 only Note down the parameters of route 0 Do not delete it Create route 90 with exactly same parameters as that of route O i e DGT LGT TGP CHC RUT FLG CRG RTN Check that ROD 1 for O G TGP used for route 0 or 90 4 1 3 2 Data Creation in SDCC TAX LDCC TAX 1 2 Verify that system parameter XCHG TYPE is 4 or 32 only Note down all the parameters of route of all the SDCAs of your LDCA Do not delete them Create new route 9 existing route codes of SDCAs of this LDCA only as noted in step 2 These routes will have same parameters as noted in step 2 except DGT LGT If DGT LGT parameter is having value 16 ie close Numbering say n then while creating new routes DGT LGT n 1 should be given If DGT LGT 16 then create new route with default value 216
48. OG UPTO LCL also Restriction on STD ISD facility for CCB subscribers without home metering eliminating misuse from payphones 18 digit storage capacity PCM Type III signalling provided on DT30 in addition to Type I amp II already available Centralised Operation and Maintenance Centre COMAC COMAC support has also been implemented to enable the Centralised Maintenance An number of C DOT 256 RAXs can be monitored through a centralise PC AT connected by leased dial up modems For details refer chapter on COMAC WORKSHOP ON C DOT DSS PRODUCTS 13 Chapter 3 SBM RAX MAX L MAX XL SOFTWARE STATUS 3 3 3 3 1 14 Previous Software Release 1 4 5 23 3 1996 This was a major release over s w P8 9 which solved most of the constraints problems observed in P8 9 and supported various new features and enhancements as desired by DOT Major highlights of this release are listed below Generic Release to support t SBM RAX DSS MAX Local DSS MAX ILT DSS MAX with RSUs DSS TAX DSS MAX XL Large capacity exchange of 30000 lines amp 6000 Trunks Supports different release of hardware Existing hardware with CPU S04 S05 alongwith 2 MB memory cards Existing hardware with CPU S04 S05 with 16 MB TME cards replacing four 2 MB memory cards in BPU and two 2 MB memory cards in SCU APU New release of Phase 2 hardware based on only two cards BPC amp BME eliminating the BIC and B
49. OP Use of standard SCSI Interface peripheral for easy availability C DOT DSS FAMILY HARDWARE AND SOFTWARE STATUS 3 6 C DOT IOP VH 1997 Newly designed C DOT IOP VH in IOP VL cabinet To be used SBM RAX MAX L MAX XL Exchanges Built around only one card VHC and one Power Supply Module Much Improvement in throughput over IOP VL Ease of Maintenance WORKSHOP ON C DOT DSS PRODUCTS 21 Chapter 4 Regional STD Level 90 Implementation in C DOT SBM MBM and 256P RAX In order to implement Regional STD Level 90 feature in C DOT SBM MBM these exchanges have to be upgraded to Software Release 1 4 5 43 3 Exchanges having S W Release 1 4 1 4 have to be upgraded to 1 4 2 25 4 to implement this feature In 256P RAX this feature can be provided in S W Release V2 1 1 4 1 IMPLEMENTATION OF LEVEL 90 REGIONAL STD IN C DOT SBM MBM 4 1 1 Definition and Dialling Plan e With this feature a STD ISD Barred subscriber will be able to dial within the LDCA in which they are located The subscriber shall dial the following for calls to another SDCA within the same LDCA x 90 Area Code Subscriber No e g 90 WXYZ ABCDE Where 90 Access Code WXYZ Area Code for SDCA ABCDE Subscriber Number 4 1 2 Implementation in C DOT SBM MBM A new level of Access Barring is added between LOCAL and NATIONAL named as OG UPTO REG i e Outgoing upto Regional 22 C DOT DSS FAMILY REGIONAL STD LEVEL 90 IMPLEME
50. P 0 active is given then IOP becomes active One of the IOPs goes OOS SYS after 4 to 5 hours working By mistake IOP ID has been given same for both IOPs How to change IOP ID without loading S W again Free Disk space decreases frequently in directory in IOP M L or V L REMARKS again Repeated reset to IOP may cause corruption of Hard Disk Root cause of this fault hanging of IOP should be detected and rectified In some cases IOC or VCP card may be faulty Normally this problem is reported where old type M L IOPs are working in MAX exchange When this problem is reported by subscribers it will be best to shutdown both IOPs and reboot again to bring them INS ACT SBY Ultimate aim should be to replace M L IOP with VL IOP For all the probable reasons refer Annexure 9 Most likely the fault is with HDL card in case of M L IOP in one of the IOP So observe after replacing HDL card in SBY IOP first and then in ACT IOP In case of VL IOP fault may be in VDE card of one of the IOP Login into root account cd usr cdot SETIOPID IOP ID 0 1 1 say cd shutdown 0 Then reboot the IOP to warm start New ID will appear Do following in the concerned IOP JOP5X cd IOP5X gt gt log IOP5X gt gt oldlog usr spool lp If disk free space does not increase then make this IOP INS SBY Then bring it to warm start amp cold start level Reboot to warm start and bring it in
51. PU S04 2Mb Mem cards is 7000 while it is 8500 with CPU S05 2Mb Mem cards BHCA capacity increases to 10 000 with the use of CPU S05 and TME 16 MB MEM cards To observe traffic pattern of any BM start traffic report for Line Reports using command Start trf rpt Next day take traffic report for Exchange Performance for the particular BM using displ trf rpt In this report the figure against parameter Total Call Attempts will give you the BHCA during any 1 Hr period By observing BHCA for last 24 Hrs we can have traffic pattern in the BM The genuine over load condition of a BM can be taken care by the use of Cpu S05 amp TME cards in place of CPU S04 2MB Mem cards In case over loading is still existing then there is no alternative but to reduce number of heavy callers from line BM or shift few trunks to other Trk BM in case of MBM exchange Cause2 Over Loading Due to False Traffic In case it is observed that over load condition of a Line BM or Trk BM occures from 9 PM onward in the evening Hrs when 1 3 rd or th STD Tariff rate starts then this can be due to two reasons No of Trunks towards tax directions are not sufficient and as a result false traffic due to repeated attempts on STD routes is generated In this case as an immediate relief from over load condition few O G Trunks in TAX direction can be added and traffic pattern can be observed To calculate exact no of trunks required on TAX direction p
52. S PRODUCTS 91 Annexure 8 IOP Synchronisation Failure Cause amp Remedies IOP synhcronisation in C DOT may fail due to various reasons There are 6 steps of IOP synchronisation Various files updated in OOS IOP from INS ACT IOP are lying in PRCDATAP directory by the name of sync grpx where x takes values from 0 to 5 Each sync group file contains different type of data files to be updated in OOS IOP to bring it in sync with the INS ACT IOP It may happen that certain file is not getting updated within prescribed time limit and as a result sync process will be aborted in that particular step to which the file belongs During sync various steps of Sync over messages will be displayed on console terminal ood terminal amp printer also Most likely the exact file name will be flashed on console terminal just before Sync Abort message Then some action is required regarding that particular file before repeating the sync procedure again In case no file is shown on console before sync Abort message still particulars of failure can be seen through sync log file in DUMPP directory using following commands in ACT IOP IOP5x gt cd DUMPP IOP5x tail 50 sync log from this note down the name of file just before the sync abort message and take appropriate action as stated in the subsequent paras 1 to 7 GENERAL PRECAUTION Before synchronisation do delete unwanted files after taking desired Back ups as per standard
53. Y Annexure 11 Reasons of Call Failure In case a call is failing Local call or a route call the cause of call failure can be established by putting the call no on observation for Originating Call and then checking its Call Detail Record CDR For this use crp command mod sub obs to put the calling no on originating observation Then make some calls from the calling no CDR will be generated for these calls which can be displayed using command displ cdr In that CDR watch for the field Call Status After decoding the message written in this field we can guess the probable reason of call failure Meaning of the call status field values are given below I o n o mw yvy 10 11 12 13 14 15 16 17 18 99 162 TST ABANDON ABS SRVC ACB RING OUT ACCESS BARRED ADDRESS INCOMPLETE ADMN BSY ALARM ALM MON ANI N PSBL BILL NOT PAID BLOCKING BSY TO PSBL BW SGN ABSENT BW SGN PRMNT CALL FAILURE CALL KILLED CALL WT CLNG 162 line test service Call abandoned Absentee service Auto Call Back Ring Time Out Access Barred Address Incomplete Subscriber Admin Busy Alarm offered as a waiting call did not mature No longer in use Alarm monitoring Automatic Number Identification not possible Call failure due to Bill not Paid Blocking on the route Busy amp Trunk Offer Possible Backward Signalling Absent Signalling Fault Backward Signalling Permanent Call failed due
54. a switch unit using SBYUPD command when the IOP is in warm start level the status is not getting effected when the IOP is brought in service I e modification is not being done REMARKS Free disk space checking is a part of IOP Maintenance procedure In order to avoid such situation Disk cleaning should be done regularly Some processes are repeatedly created When it happens again C DOT may be contacted In normal course cre space utility and other disk cleaning methods will take care of this More than this any way space is not required In next Unix version full space will be utilised These commands are UNIX commands which are meant for individual IOP only and hence are to be given in growth mode only VDE card may be faulty Solved in 5 43 S W Solved in 5 43 S W Reload complete software again Operator terminals and accounts have to be added again with desired permissions Modification will be effected after the initialisation of the system upto part init level WORKSHOP ON C DOT DSS PRODUCTS 31 Chapter 7 SL NO 16 17 18 19 20 21 22 23 24 25 26 PROBLEMS Getting display of uncorrectable error in data field drive 0 slice 1 At this stage if some commands i e mod lin sta del sub cre sub etc given then we are getting no acknowledgement from mate CEP Above commands not accessed on both IOPs IOP 0 amp IOP 1 IOH files are not get
55. after the trunk got rectified Cannot make the ACC BARR as OG NOT ALLD and IC BARR To subscriber simultaneously in 5 23V Normally safe custody subscribers we cannot delete sub We were normally kept these subscribers as OG amp I C Barr in 8 9V Not possible to change time status from BNP ANNC to NRM LIN directly Subs who is under BNP ANNC He clears all dues within 15 days We should be able to change his line status from BNP ANNC to NRM LIN directly without going to BNP DISC NCBRPRN utility not working i e not printing it only displays on screen REMARKS Blocks of 10 nos 100 nos 1000 nos can be used Utility has limitations and from to option cannot be provided There are some problems in traffic reporting These will be taken care in next software release First give part init to Trk BM If not solved then give part init to AM using init mod command Check whether TTC s is INS ACT and TA bus cable is properly connected Hook switch timing may not be proper Try using flash switch To be verified DATPAT to be used only with Control Room Assistance Force out and force in Problem solved in 5 43 Solved in 5 43 Use new rgen 46 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SL NO 145 146 147 148 149 150 151 PROBLEMS When service code 43 is used telephone goes dead for 1 mt and restores automatically without succes
56. al module in an MBM exchange In case of BMs individual BM will go for initialisation In case of init mod to CM all the BMs will go for initialisation upto SBL CLR level whether softstart SBL CLR Part init or even code load In case of init mod to AM all the other modules i e CM amp all BMs will go for SBL CLR irrespective of the init type whether code load part init SBL CLR or softstart given to AM 110 Is is possible to concentrate DTU with another Yes it is quite possible For optimum use refer DTU when each stream is having only 6 to 8 Annexure 17 WORKSHOP ON C DOT DSS PRODUCTS 59 Chapter 7 SI No 111 112 QUESTIONS channels assigned B W is not working on PCM trunks Call overflow meter indication not observed even during congestion period 113 Any spl Route is there other than level 1 COMMENTS Annexure 17 Digital BW is not implemented Not implemented in 1 4 5 43 3 ILT special routes may be there in case of ILT exchanges Also 96 pager route 7 9 SUGGESTIONS REQUIREMENTS FOR SBM MBM in SUGGESTIONS REQUIREMENTS COMMENTS 1 Modification of Line Register signalling is not It is a good suggestion It will be provided in possible TGP has to be deleted In case of TAX next software release it will be a cumbersome procedure on TAX if lot of routes are going on a particular TGP 2 It should be possible to allow one category Su
57. ange end not provided 3 Link is not established through the tie jns between two 256 RAXs 8 In slave frame 10 amp 17 slots are not getting E amp M status Only LCC and TWT option is available 9 In most of our 256 RAX Announcements are not getting with one RAT With the two RATs Details billing is provided for level 90 in 2 1 1 s w as per TEC specs Upgrade 128 to 256 P RAX Available in CDOT 256P from release 1 04 ownward 2 Nos of RMF cards provided are adequate 256 records only due to H W limitation Use PC for dump The purpose of password is to avoid mischief No solution The first two are implemented as it is The last one is under CDOT observation In slave frame slot 10 and 17 cannot be used for E amp M cards With only one RAT tones alone will be active For tone and ANNC both the cards should be WORKSHOP ON C DOT DSS PRODUCTS 67 Chapter 7 SI 10 11 12 13 14 15 18 21 No QUESTIONS getting announcement In Yellampet CDOT 256 exchange if we provide DTMF facility to a sub then No gets busy tone instead of dial tone if that subs lifts handset RMF cards are OK i e tested at other exchange On dialling the diagnostic number printer not present printer power failure condition is permanently extended by continuous test tone even if printer is present and ok For Sub DCR amp meter readings max 256 records are provid
58. architecture of C DOT DSS systems supports the concept of Remote Switching Unit RSU from the very beginning With the successful field trial of single RSU Module along with 10000 lines C DOT MAX 1 Exchange at Palarivattam in Ernakulam Telecom District and the cluster of 4 RSU Modules total 5000 RSU lines alongwith 4000 lines C DOT MAX 1 at Satpur Nasik Telecom District in Maharashtra Telecom Circle the Network Planner can go ahead with Planning Installation of RSUs at the existing MAX 1 sites as well as new sites under different stages of implementation A normal SBM RAX without IOP ADP can be used by replacing two cards in TSU The details of feature highlights planning requests are listed below RSU Features Software Rel 1 4 x x 3 e Enhanced Route Code Support Unique Max 60 unique exchange codes catering 1000 numbers each to support 60 000 directory numbers Fewer no of shared exchange codes catering to 10 000 directory numbers each ARSU can Have its own unique code Can share the main exchange code Can share the main exchange code along with one unique code Alarm reporting for PCM failure between main exchange and RSU at main exchange Does not require controlled environment WORKSHOP ON C DOT DSS PRODUCTS 73 Chapter 8 8 5 74 Remote Switch Unit RSU Features e Support for 4 Nos 2 Mb PCM links between RSU module and main exchange e New charging strategy for RSU e Des
59. are for BGS package has become obsolete and further upgradation in BGS package has not been done because DOT has developed its own TRA Package called TRICHUR This package support C DOT SBM MBM exchange BC cartridge taken by copy out command Presently originating traffic successful and incoming traffic success available CCR for Local call will be provided in the next S W S W implementation is done that way Use crp command displ dirno rsrv to take a list of frozen numbers prior to retrofit Call waiting called facility given Check up This will be taken care in the next s w release Meter readings are associated with TEN only It will get transferred during MOD SUB TEN to new TEN If you delete and create with new TEN then only meter reading of the TEN 54 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SI 60 61 62 63 64 65 66 67 68 69 70 71 72 No QUESTIONS 3 minutes beep sound is creating problem in data circuits is it possible to supress beep sound for one particular line If we have 30 junctions in one TGP with 15 junction in one DTK and remaining 15 jns in other DTK calls are always landing in first 15 jns during slack hours only when calls are more than 15 in one particular time then only calls are landing in the next 15 jns of other DTK In displ trans transaction such as displ sub and copy out copy in are also coming The
60. blem Replace it and try again First the particular terminal has to be deleted using del trm command and then created by add trm command Check the SIO IOP L and VDE IOP VL card Most potential enemies of hard disks are irregular power supply and high room temperature Another probable reason is frequent resetting of IOP without graceful shutdown If we can take care of these things hard disks will remain stable Irregular Power supply dust in switch room and bad air conditioning may cause floppy cartridge drives to go faulty In this case give exit to come out of IOP5X gt IOP5X gt exit Then console login will appear This is the case of sync abort in step 5 in which all the detail bill amp traffic files are transferred To solve the problem refer Annexure 8 para 7 Before giving reset the console cable can be shifted to SL2 or SL4 link Then login prompt should appear on the screen Once login appears one can enter admin account and do the required work on IOP However IOP has to be shutdown and then rebooted through console 32 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SL NO 31 PROBLEMS In MBM 2K C DOT some times subscribers are not able to change their keywords What is the remedy When interchange command is given for AP critical alarm is raised for IOP and both IOP become OOS SYS None of the IOP becomes active again Only when reset of A
61. bscribers in one of the subracks in LM After diagnosis of TI05 0 okayed report is getting After making TI05 0 to INS SBY and then to INS ACT all directory nos in this frame goes to OOS SE If TI13 1 when made ins act all DTKs become OOS SE BM4 CMS3 amp CMS4 go OOS SYS often If both CMS3 amp CMS4 goes to suspect at a time and becomes normal after some time the lamp on ADP remains red for CM In 1 4K SBM one green lamp glowing on ADP displ sys all command shows all units INS SBY REMARKS It is essential to make BM TIC OOS i e TIO1 TIO5 TIO9 amp TI13 should be OOS OPR before diagnosing the concentration TICs Try replacing act TUC Transient problem Try replacing BIC BID or MEM cards one by one 73321 driver chip at position going bad if it is through cable PCM PSU corresponding to active TIC is faulty SPC card of Ti05 0 is faulty Although DGN is OK Replace the card Check TUC card of T113 1 Two CMSs going OOS SUS will create Critical Alarm Change MSC amp MSD cards Most likely the lamp is due to pending power alarm of a TIC Note down TIC No from displ arm list command for which power alarm is shown Then switch off on the relevant PSU with clear the alarm a b Incase alarm is still not clearing then change PSU corresponding to TIC otherwise change Active copy of TIC card 36 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS
62. by giving command lt init iop 2 1 On this iop come out of crp by pressing ctrl D iop5x gt cd GLBDATAP lt gt iop5x gt iop5x gt lop5x iop5x gt iop5x gt iop5x gt iop5x gt iop5x gt iop5x gt ls GLBDATAP apdatb gt xx ls GLBDATAP aprten gt gt xx ls GLBDATAP apoftg gt gt xx ls GLBDATAP aplvl1 gt gt xx ls GLBDATAPhiorttg gt gt xx ls GLBDATAPhotrem gt gt xx ls GLBDATAPhortim gt gt xx ls GLBDATAP aprstr gt gt xx ls GLBDATAP aprtmx gt gt xx rm catxx Insert BMDC cartridge in this iop iop5x gt cpio icvu cat xx lt TAPE iopbx cd GLBDATAP iop5x gt iop5x gt iop5x gt mv apdtoe dat xxx dat mv apdtoe idx xxx idx mv apdtoe lok xxx lok iop5x gt cpio icvu data exdata glbdata apdtoe lt TAPE WORKSHOP ON C DOT DSS PRODUCTS 84 10 11 12 13 PROBLEMS RELATED TO ROUTE INCONSISTENCIES Create all routes ordinary special DID in growth mode and load bd which was taken from active IOP iopbx mv xxx dat apdtoe dat iopbx mv xxx idx apdtoe idx iopbx mv xxx lok apdtoe lok Make this IOP in service active after bringing mate IOP to warm start level Give init sys part init Then bring the mate IOP in duplex Note If DID routes are not present step 8 9 amp 11 are to be skipped WORKSHOP ON C DOT DSS PRODUCTS 85 Annexure 4 Reasons of Initialisation Due to Software Recovery Counter Overflow Please make sure in data creation that the
63. e 7 Sync Abort in step 5 This is the most probable step of sync failure In this step all Detail Bill Files traffic files and all oodlogxx files are transferred Normally by deleting previous tf and bc files will solve the problem Otherwise note down exact file name in sync log file in DUMPP directory Then delete that file using del fgp file command Remove all oodlog files in TEMP directory as mentioned in para 2 Then repeat the synchronisation process 94 C DOT DSS FAMILY Annexure 9 IOP Failure During Interchange In a duplex IOP configuration one of the IOPs will be in INS ACT state and the other will be INS SBY Though both IOPs in a duplex cnfiguration are physically connected to both the APs BPs through HDLC Links HDLO amp 1 only INS ACT IOP will be able to communicate to INS ACT AP BP But all updations which are occurring on the INS ACT IOP will be performed on the INS SBY IOP also This is done by the INS ACT IOP through the IOP to IOP HDLC link HDL 3 The operator commands which are initiated from the INS SBY IOP get routed through the INS ACT IOP to AP BP if the command requires communication with AP BP INTERCHANGE TO IOP x Say at any time IOP 0 INS ACT amp IOP 1 is ins SBY and AP 1 BP 1 is active and AP 0 BP 0 is INS SBY It means IOP 0 HDL 1 and IOP 0 HDL 3 and IOP 1 HDL 3 are coming into picture HDL 3 for exchange working x As soon as interchange of IOPs is give
64. e Many problems requirements were reported by the participants These problems with comments solution from C DOT are being reproduced here to propagate it to the gross root users 7 1 1 IOP Related Problems SL NO PROBLEMS REMARKS 1 When IOPs are brought to DUPLEX i e while Refer Annexure No 8 synchronisation of IOPs is done sometimes sync abort will take place Reason for sync abortion is not known How to know the reason and how to proceed further 2 IOP goes OOS SYS when ED BD Back up is i Cartridge itself may be faulty taken ian ii In case of new cartridge give IOP 5x TAPE 3 Sometimes copy out is possible but copy in fails This situation is possible because of for the same cartridge compatibility problem of the cartridge drive So it is advised that once a week back up taken on one IOP should be read on the other IOP using CRP command displ tape info 4 IOP VL in Duplex mode for 2 days and again Improved in 5 43 software version one of IOP go out of service and again by rebooting it again came back into INS SBY 5 Some times on display few lines are coming as Delete transaction files If not able to delete follows trans etln seq 25 contact C DOT 6 Sometimes we see drive no slice no so please Refer Application note on Hard disk give detail information about drive No and slice no formatting IOP User Manual Contact C DOT for copy 30 C DOT DSS FAMILY PROBLEMS REPORTED DURING
65. e due to non availability of trunks even when all trunks are free We have tried by recreating the TGP and route But the problem solved only after giving INIT SYS with part init Problem in switching in DID route for ILT route working There are three DID routes i e 22xxx 28xxx and 24xxx the levels of which are being supported by the strowger exchange The strowger exchange is working in tandem with MBM exchange When the subscriber dials any one of the above routes he is getting held up and the switching is not taking place MBM exchange codes are 25xxx 26xxx 27xxx One working number went out of service system side Given delete command not deleted On re creation no could not be created on the same TEN Reports TEN already assigned No created with another TEN It is working ok But meter reading is on two TENs increment is only in new TEN Sometimes particular subscriber parameter gets locked and modification to subscriber is not possble How to solve it Some times garbled announcements start coming in the system How to unequip a BM in MBM exchange During addition of a BM in a working MBM exchange some times equippage of new BM fails with message inconsistency between two files While creating a route by CRE ROUTE command error is coming as can t write in the file When subscriber is created the port comes REMARKS TGP data corruption Problem solved in 5 43 version Make system paramet
66. ed Whether these 256 records are included for TGP DCR record also or separate TGP DCR records are available Wether date amp time records of S U password change and using available Can all the subscriber be STD PCO Can all the subscriber be given DTMF facility In 256P RAX super User password should not be unique This creates problem of unauthorised manipulation The Detailed Call Record DCR is stored for a limited no of calls It should be increased Can LCC TWT amp EMF cards be jacked out in in PSU ON condition 19 How to create special service Nos like 100 197 Refer Annexure 1 for creating such Nos 198 in 256P RAX 20 DTMF facility is not working when facility DTMF channels to be configured in RMF programmed MF facility on jns provided often hangs COMMENTS present as passive copy RAT feeds announce ments and active copy RAT feeds Tones RMF channels should be programmed for DTMF circuits also for a DTMF subscriber to get dial tone Solved in s w release 2 1 1 Max records are 256 only which includes all Not available Since the traffic handling capacity of 256P RAX is 6000 it is not recommended to use all the subscriber ports as STD PCO Yes all the subscriber can be given DTMF facility It is expected that such subscriber are provided DTMF instruments also otherwise it will load the exchange In S W 2 1 1 1 super user password is modifiable thus solving t
67. ed data are recorded What is required is old and new data 60 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SI No 11 12 13 14 15 16 17 18 19 20 21 22 23 24 SUGGESTIONS REQUIREMENTS COMMENTS Dial by eqpt facility should be available for the Suggestion taken OOS OPR terminals trunk ports only During the back up the blocks may lost sight of Suggestion noted for recording in the register It consumes considerable time to re read the Tape Provision may be made either in the trans recorded or the files recorded to save time The disability of automatic locking of un locked Alternate solution is being implemented in next subs Whenever part init or above are given is s w release to be removed in view of the problems it creates to the maintenance staff of MBM SBM ROD is attached with TGP It will be Suggestion Noted convenient if this parameter is associated with route Also min dgt szed forward parameter No facility to take list of INS LLO subs of all To be added in Rgen INS LLO For total displ BM in displ trm all It is suitable for SBM or Iscnt oos can be used For details new rgen can MBM lt 2K But MBM with 20K we have to give be used displ trm all for each BM BM no option ALL should be provided in command On CCM card instead of two ports provide 16 Suggestion noted kHZ for all the 8 ports
68. er Routes for which the charging is same only one route should be created For calls from a Haryana SBM to Tamilnadu SBM route 04 should be created Make this IOP active and Transfer the data to AP BP by PART INIT Please refer C DOT DSS MAX ILT document for detail implementation 8 6 CONVERSION OF SBM TO RSU Any SBM exchange connected to an MBM exchange having same STD code as that of MBM can be converted to an RSU Prime requirement for such a conversion are given below 1 2 Minimum 4 PCMs required between Main Exchange and RSU site EPROMs of all controller cards of SBM to be programmed as per MBM configuration WORKSHOP ON C DOT DSS PRODUCTS 75 Chapter 8 3 Additional items required will be 3 1 Cards 16 MB Memory Card TME APC TMEA64 F S02 Remote Time Switch RTC APC RTS457 H S02 16 MB Memory Card TME APC TME464 F S02 Remote Switch Multiplexer Card APC RSM368 H S03 RSM 16 MB Memory Carats a RTS Card ee RSM Card pf No 3 2 Cables Card Type Qu RSU Clock Cable ACB RSUXRCXN 000 Digital Trunk Cable I ACB RSUXRDXN V00 BP Terminal Cable ACB RSUVTEZX 000 Digital Trunk Cable ACB MAXRMDXX V00 3 3 Modems 2 Nos One at RSU and one at MBM end e 4 Items that will become Redundant after the conversion 1 Two SSM cards which can be used as spares 2 Two TSS cards which can be used as spares for normal BMs 3 2 MB memory cards recovered from SSC AP and SBM 4 Tw
69. er Routing 5 Data inconsistencies has occurred To correct it using datpat contact C DOT This can be done through DATPAT with the help of C DOT Check type of announcement being used from check sum of language EPROMs provided in ANNC card Copy the relevant announcement files into GLBDATAP directory from PRCDATAP directory Give part init to system or the affected BM Not possible to unequip a module Old Ed can be copied which does not contain that BM Else contact C DOT Yes it is possible if it has been done on line amp in busy hour If this activity is performed during late night in absolutely low traffic hours it will be successful provided correct procedure is followed It is advisable to follow all the steps mentioned in Application Notes on Expansion of C DOT MAX L exchange Refer Annexure 3 for solving route related problems These can be following possible faults WORKSHOP ON C DOT DSS PRODUCTS 43 Chapter 7 SL NO PROBLEMS OOS SE and can be brought ins only by frc trm oos ins Some is true for creating of TGP REMARKS 1 TTC is INS ACT but Test Access cable from TTC is not through to the TU which no TGP is created 2 Test access bus is not through in that slot due to active TIC fault Interchange TIC will solve the problem Therefore it becomes necessary to ensure that TST TRM is successful in all the TUs amp then create the subscribe
70. es The utility is cre space Run Cre space on IOP5x prompt Goto CRP and give command del fgp file OPT 2 FGP tf From date gt To date Give date options for 3 months at a time e g current Date 25 3 98 Then start deletion of tf from 26 3 97 onward Repeat the command till date 24 3 98 is reached 48 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SI No QUESTIONS COMMENTS e Shut down and Re boot the IOP Blocks may increase by this Incase you find some difference in free blocks in two IOPs then do following In both IOPs give command IOP5x du OR Take print out on printer by following command IOP5x du dev icc 0 Now compare the two lists to note down the name of directory having different block size Enter in the directory having different blocks in both the IOP s unusing cd command Find out extra files by displaying the contents Consult C DOT control room in case of any doubt Remove these extra files to make the df equal in both IOPs 2 Sometimes cartridge restoration is not possible due to incompatibility problem If restoration is not possible with different cartridges it may be due to head alignment of the cartridge drive The cartridge drive is to be replaced Since IOP L M is having 60MB cartridge drive and IOP VL has 150 MB cartridge drive therefore cartridges prepared on IOP VL can be
71. f 13 PCMs in BM L and 15 PCMs in BM XL Route modification command requires entry of Valid Suggestion C DOT will consider it in old parameters also alongwith charge future software release parameter Long distance circuits channel to channel not P Wire facility will be considered in next s w available in MBM release On TTY terminals at MDF capacitance test Line categories are to be defined properly Refer shows failure even though line is OK Annexure 15 SCBR Subscriber credit bill record mentioned Not implemented in documents but not working actually Momentary i e 10 sec urgent alarm for BP Alarm introduced for unit status changing to during sometimes suspect What is the STD call counter last value CDOT Last value is 65536 MAX ILT Is there any routine to use audit command To be used only to clear false alarms WORKSHOP ON C DOT DSS PRODUCTS 53 Chapter 7 SI No 51 52 53 54 55 56 57 58 59 QUESTIONS Answering Circuits could not be formed even after acceptance of all parameters such as ports etc The DTS and DTK going faulty during night time showing oos trans so many times But after making out and cooling it near A C it comes in service But at the same time newly installed 1K in the same room UTL make is not giving any problems due to A C The printout of subscriber under malicious call observation shows STD code and part of subs no on calling no
72. ffected The exchange earth resistance is less than 10 i e 0 7Q The protective devices are not acting during lightening In the same area 512ILT exchange is not affecting due to lightening What are the precautions we have to take when SBM exchange located near by 132KV sub station area During lightning it is observed that both IOPs are coming to IOP 2 5 Normally we are able to boot and restore IOPs On 4th Nov 97 both IOPs failed IOP 1 brought in service IOP 0 when given bo halted at RMAN DRIVER and not proceeding further Changed IOC card and no effect The probability of damages can be reduced by ensuring Proper earthing of MDFs through collector plate by using 10 mm black earth cable Integrated Protection Module IPM recommended by C DOT should be installed at MDF Ensure that IPMs make proper contact with earth strip provided beneath it Make sure that at no point AC earth and DC earth are common Say at inverter or power cabinet Following steps may be followed 1 All LSA modules should have earth strips 2 MDF is properly grounded 3 IPMs are inserted properly and making contact with earth strips 4 Wedge the line on exchange side before removing IPM when such fault is reported Earth resistance should be 1 Q Provide IPMs in MDF For inverter grounding refer annexure 16 Check up inverter 31d pin Not to be extended to terminal and printers Checkup PER card Refer Annexure
73. field units and the data collected by C DOT Installation Operation and Maintenance support team visiting the field sites has got a long list of irritants These irritants need not necessarily be problems but do contribute to inadequate maintenance C DOT in its presentation during these work shops apprised the participants to all those irritants and the solutions to get around them C DOT also took care to progressively include the fresh feed back being given by participants in each of those workshops It has been observed that as expected most of the problems clarification or issues the participants had in mind were covered as a result of C DOT s own treatise on these problems and lists of fresh problems being indicated by the participants had a diminishing count C DOT has felt that these workshops had been very helpful and as a result of large number of doubts being cleared We have confidence that the participants will be able to Install Operate and Maintain the C DOT switching equipments much more efficiently than ever We sincerely hope that this document will also help all those who will not be able to attend such a work shop WORKSHOP ON C DOT DSS PRODUCTS 80 81 Annexure 1 Creation of Special Service Numbers 100 197 198 in 256P RAX Any special Service No 100 197 198 etc can be created in 256 RAX using following steps 1 Open Direction 1 as Special Service cnfg 1 1 lt TGL gt 2 Configure one slot as RD Ring Do
74. file name in sync log file in DUMPP directory If it is a traffic file then delete tf grp till current date and synchronise again However if file is other than traffic related then contact C DOT Control Room for further action 4 Sync Abort in step 2 Repeat sync in late night hours when no traffic is there Before synchronization bring Active IOP to Cold Start using INIT IOP 2 1 and INIT IOP 1 1 Reboot IOP and make it INS ACT by init iop 5 1 command 5 Sync Abort in step 3 In this step all Ed files are transferred Note down the file name and consult CDOT Control Room for further action as ed files are difficult to handle In some cases copy in old Ed in the active IOP in warm start level and then make it active again Then give part init and start sync process again 6 Sync Abort in step 4 Run cre space in Active IOP If cre space is not available then give following command in active IOP WORKSHOP ON C DOT DSS PRODUCTS 93 Annexure 8 IOP5x gt find u name log print Note down the directory and log file names Then go to the particular directory and remove log files by giving full names IOP5x rm abc log etc where abc log is the file name IOP5x gt cd TEMP IOP5x rm result IOP5x gt cd FDTDIR IOP5x rm heal Now give softstart to the system using init sys command in crp mode i e lt init sys Soft Start After System has recovered fully repeat the synchronisation procedur
75. ggestion is good We shall try to implement universally in all the routes it otherwise a separate utility will be generated to accomplish this 3 Protection Module should be such that in case of TEC approved connection type modules removal of GD tubes it should not make the provided lines through 4 Deletion of upto date commercial bill record Reload BC so as to restore com bill file while deleting BC for any date not yet solved Problem is being taken care of in next S W Release 5 NUM ANI 10 this will not support cellular and As per TEC specs only 10 digit CLI is required ISD no calls in CLI because length is more in in DOT NETWORK SO NUM ANI 10 is these cases sufficient 6 Display call info is given in Admn 23 It should To be implemented in next s w release be changed to Admn 10 or mtce 7 7 Separate category is required in MOD LIN STA To be implemented in next s w release for keeping the Nos under SAFE CUSTODY 8 Remote alarm no should ring only for SWU To be implemented in next s w release alarms so that the purpose will be utilised fully Remote monitoring can have non urgent urgent critical SWU alarms 9 Call counter for ISD STD local for a day can be To be implemented in next s w release introduced 10 While doing any modification in CDOT in Suggestion Noted transaction files the original data already existing is not recorded only the operator input data and new modifi
76. h is 4 Then this parameters should be made 3 The crp command is mod sys param min subs dials 3 in this case It is advised not to put more than 40 TEN s in a TGP If it is required to have more than 40 trks in a direction then associate 2 or more TGP s with alternate choice in TGP CHC parameter of the route C DOT DSS FAMILY 13 14 15 16 17 18 DO S AND DON TS W R T S W RELEASE 1 4 While taking traffic reports related to trunks amp routes the entry against parameter MOD NO should be AM While changing any TUI card proper jumper settings should be ensured While changing any CPU card in BM CM amp AP the jumper settings and EPROM status should be ensured Inverters should be grounded to exchange earth and not to the AC earth 3 Pin supply should be provided to the VDU terminals At the time of changing any controller card from some other site correct Software version of the PROMs should be ensured before jacking the card into the system Avoid initialising the system to Part init level or above as far as possible This will cause all the subs having Sub OG BARR facility to get locked Of Course subscriber can open their locks using dynamic STD level WORKSHOP ON C DOT DSS PRODUCTS 29 Chapter 7 Problems Reported During C DOT Workshops 7 1 PROBLEMS RELATED TO SBM MBM EXCHANGES C DOT workshops were conducted at various places The sessions were well attended and quite interactiv
77. hing cubicle to IDP DCPP and to cabinets is to be taken into account All the additional subscriber cables and MDF cables as per installation manual are to be taken into account IOP Only two IOP s of existing SBM will be required but with one additional Winchester disk drive in each IOP MDF New floor mounted MDF of 10 verticals will be required to be installed but the back mount frames and LSA modules can be as per actual requirement This can be calculated from Installation Manual Installation First physical installation of all the additional hardware is to be done Then data is to be created in growth mode in one of the IOPs and testing of CM hardware and additional BM hardware can be done After this the existing exchanges are to be connected in the night and freshly created data is to be transferred by initialisation WORKSHOP ON C DOT DSS PRODUCTS 77 Chapter 8 8 8 8 9 78 INCLUSION OF SBM TAX IN AN EXISTING MAX L Around 100 SBM TAX have been commissioned in the network as Level III TAX At some places MAX L exchanges ranging from 5K to 10k are already existing traffic from such large capacity exchanges alongwith other small capacity of the range of 1K 2K has been diverted to the SBM TAX This has resulted into heavy traffic and overload problems in the system as the handling capacity of SBM TAX is only 9000 BHCA It is suggested that traffic considerations should be taken into account while planning a Level III
78. his problem Not possible However PC connectivity to Maintenance Panel is provided and using PC based DUMP s w or COMaC software DCRs can be stored in the PC at regular intervals Yes these can be jacked IN OUT without any problem in PSU ON condition Test RMF channels 7 6 SUGGESTIONS REQUIREMENTS FOR 256P RAX 128P RAX bea SUGGESTIONS REQUIREMENTS COMMENTS C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS ES SUGGESTIONS REQUIREMENTS COMMENTS Distant end hot line facility between two Will be available in future s w link stations without any equipment such as 2W to AW conversion etc 2 If the TGP is in decadic mode RECD 3 2 3 is Not possible possible 3 Modem card may be incorporated in RAX 256 Suggestion may be considered for future switch itself implementation In 256 RAX 00 route may be treated as Suggestion noted amp will be considered in future separate so that the route may be barred for s w release any i c TGP as in SBM priority decides routing 5 While doing modifications using COMAC s w Password option is being included to provide there should be a provision such as respective full proof security in the next COMAC S W RAX user S U password to be used Acommon version 1 21 a S U password should not be used Level 1 max 10 route codes are only allowed in On level 1 upto 20 routes will be made level spl ser Not able to allow more route codes ava
79. idge the Message will be modified in next software message Perhaps C option should be used release This message is misleading Why the free disk space is different in two IOPs It may be because of the following reasons If IOPs are not in DUPLEX If disk cleaning is not done in both the IOPs If certain command files are run the log file is created in that IOP only Replacement procedure of 2 Mb memory board No special replacement procedure of 8 Mb to 8 Mb memory board at IOP memory card One 8 Mb memory card can be placed instead of two 2 Mb cards in the slot 7 Some document required to take care of IOP Updated IOP User Manual take care of all such related problems problems We are going to change the hard disk from Application Note is available on procedure to 70 70MB to 1 2GB What is the procedure in replace Hard Disk 50 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS QUESTIONS COMMENTS LR LU At times when cre space is used ood log files Yes ood log back up is to be kept if required get removed instead of nullifying Whether ood OOD will get deleted log files are to be deleted nullified Whether the o p of CRP commands can be No O P of CRP is not stored in a file Of course stored in a file for viewing later printer a command file of crp can be made for this abruptly stops at time so command to be given purpose again 11 Whether one more printer can be connected If Only one
80. ilable in future release We talk about Remote monitoring alarm but in No solution possible for Site specific field we have 99 all RAX working in simplex maintenance problem copy and same facility is not useful in simplex copy working in which p s unit is also one In RAX 128 if we dial xxx200 for Remote monitoring alarm due to single p s unit it will continuously give s b p s unit fail Alarm so could not go for further test Hence is there any solution to have these facility can be had in simplex copy or in case where only one p s unit available Details of the Modifications subs creation Suggestion noted deletion done through COMaC should come on printer WORKSHOP ON C DOT DSS PRODUCTS 69 8 1 Chapter 8 Enhancements From C DOT UPGRADATION OF 128P RAX TO 256P RAX The initial impetus behind the development of C DOT 128P RAX was to replace the then existing electro mechanical strowger exchanges with digital automatic exchanges The rural transmission network was and still is predominantly open wire The exchanges were realised only as terminal exchanges that is without transit capability The signalling on the subscriber loop and trunk interface was decadic and the STD facility was extended on open wire carrier systems with decadic register signalling This lead to misuse of these facilities and the subscribers often complained about the excess billing In order to provide enhanced features to subscribers and
81. ilure observed Kindly explain in detail how junction traffic can be taken correctly Call disconnect after one call duration for CCB sub Whether this is applicable SBM MBM The time required for testing a line using the command TST TRM and test set no such as 106 etc is too high in the order of one or two minutes We should have some methods for testing the lines quickly within 5 to 10 sec The parameters to be tested in this method can be limited to earth on each limbs and condensor capacity testing Only in cases where all other parameters are required we can use the present procedure which will take more time Using latest s w 5 43V and taking traffic into consideration is it possible to have 5 1 concentration so that more shelves can be added in LM2 With 4 1 concentration and 5 43V 5 23V how many maximum no of subs can be connected For MCR only TEN no will be given Whether it is possible to get subscriber telephone no of distant station in new version Two different taluk places of same SDCA routed through LDCA Is it possible for 90 dialling facility for the above two taluks Can we modify a c RSU to non a c RSU When a no has call waiting controlled by called sub TRM facility we cannot keep this no COMMENTS 3 Party Conference is available without conference card Releasing the service is matter of DOT policy More than 3 party will be released in next S W version No policy for s
82. ired charging between main exchange BM and RSU BM possible e Desired charging between one RSU to other RSU e Max termination of 2024 subscribers e Max BHCA handling capacity of each module 8500 e Stand alone switch to provide local switching in case of total PCM failure between RSU Module and main exchange e No loss of revenue for the calls made during stand alone switching e Automatic restoration of total services even in case of partial restoration of PCMs e Call saving on DTK Failures of shifting established calls to available slots of other PCMs of the same bus e Trunk interphase possible in latest S W Release 1 4 5 43 3 CONVERSION OF C DOT MAX TO MAX ILT The C DOT DSS MAX exchanges of various configurations ranging from 1 5 K to 10 K lines are working in the country The C DOT MAX are integrated as local and tandem exchanges in network In addition to local and tandem function the same C DOT MAX exchanges can also perform the function of Trunk Automatic Exchange TAX when they are configured as MAX ILT exchange The C DOT MAX ILT exchange generate the different charging for various TAX routes for their own subscribers and as well as for other exchanges which are connected to this exchange These exchanges which are connected to MAX ILT either have the same STD code or can have the different STD code Instead of putting separate TAX exchanges at each of small district places existing C DOT MAX L exchanges can be configured a
83. irst one New rgen to be loaded hour obsn is displayed After that only some multilated reports got Whether there is any restrictions for putting Refer Annexure 14 for present S W release TGPs under observation Observation of TGPs and trunks individual This option has been removed in RGEN Now CDOT information obsn in multiple of four for one TGP it is possible Result TGP observation rpt ok But individual trk rpt not coming when trk CDR command given in RGEN Frequent failure of auto alarm facility to subs Solved in 5 43 software The facility is restoring after deleting and creating the sub EMF trunk junctions both ways observed one Problem is under CDOT observation way speech locally After landing in that particular junction the speech is restoring Call transfer facility to pager and cellular As per the TEC spec it is not provided in 5 43 phones is not working S W Call waiting facility is not 10046 success After After 5 43 retrofit it could not be simulated at change over one party is getting disconnected site further feedbacks may be given in more than half of the cases While testing the local lines by giving TST One of the line card has low insulation To be TRM the result after testing are being shown isolated by removing TA cable as ve values for the tests insulation of A limb with gnd Insulation of B limb with gnd Insulation with A amp B cross The same TTC is working ok in other BM E
84. ke care to display meter reading for free nos DOT billing package is there which has been standardised Ringer is not required for digital BM Implemented will be done in next software release Suggestion is good But not feasible in software However information is available in documents like Subscriber Features Detailed Billing feature is available in S W Released in 1 4 2 25 4 and subsequent releases Not provided in software However Calendar Management can be utilized to give commands for Ed amp Bd backup at the desired time Not possible at present Next software version will take care Being implemented in next s w release It is already available in rgen V 7 2 Classes have been reclassified to meet field requirements in next s w release Implemented in S W release Implemented in S W release 62 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SI No 39 SUGGESTIONS REQUIREMENTS COMMENTS RGEN utility for 5 43 is not compatible with It is now available in latest version7 2 1 4 2 25 4 software 40 In 1 4 2 25 4 software RGEN utility to take It is available in new version 7 2 care of TGP detail billing records and TGP meters 41 It should be possible to see Displ cdr for trunk Alternate solution is implemented in next s w observation release in the form of MFSA It can be seen through rgen trkcdr 42 It should be possible to
85. l report comes and MU 1 remains in OOS OPR status In such a case it is possible that one or more memory cards are failing under updation during PUT SWU INS action In such a situation MEM cards are to be replaced one by one and MU 1 brought INS using PUT SWU INS command till MU 1 becomes INS ACT DGN of MU 1 is passing with both BPs but PUT SWU INS command fails Then the whole set of MU 1 has been replaced by good ones even then MU 1 is not coming INS In this case fault may be in the ACTIVE memory unit MU 0 in one card or more than one card It will be best to replace MU 0 completely with good set of memory cards For this BM has to be switched off and after replacing MU 0 cards BID MEM or BID TME BPU amp TSU are switched on Give reset to all controller cards and let BM go for code patch data loading Once system recovers then try to bring MU 1 INS ACTIVE by standard procedure as discussed in step 1 WORKSHOP ON C DOT DSS PRODUCTS 103 Annexure 13 Detail Bill Files BC Group Management The system creates one file for each day of the year to which entries of the STD calls done by subscribers are made Thus for 365 days of the year there would be 365 files These files have date and month stamps but no year stamp Failure to do regular disk cleaning can lead to a situation where data corresponding to two identical dates of two consecutive years is present on the disk in one file Thus data corresponding to 1 5
86. lable from certain date i Recreate isp process onward IOP 5x ps eflgrep isp It will display IOP5X gt kill 9 xxx Now message should come Recreating isp Give Return to get IOP5x gt Now Detail Bill will start generating ii When meter reading is taken through ii Give soft start to system using crp Report Bill Cntr it is showing old meter command lt init sys softstart reading while reading is OK through Displ Sub Mtr After 2 Hrs verify meter reading in IOP using fmt blg cntr amp Report bill entrs 69 In NCBR Detailed bill record false metering Media fault Taken care in 1 4 5 43 3 s w link pulses are encountered for MF routs only 70 There are some cases observed by seeing the Bulk counter records total of STD counter amp detailed bills of STD ISD in which the bulk Local counter Total meter reading as seen meter reading is not matching with the actual through displ bill record should match with printout given for the period by command std counter displ bill rec i e the STD ISD is showing very very less as compared to bulk mter 71 While giving Report bill entrs it is not possible Formatted file may not be available or printer to get all numbers print out At a stretch only ECN to be verified 200 nos are getting Some numbers are found missing Diversion of call coming in ncbr report for nos It cannot happen without giving any facilit
87. level 2 Killer trunks level 1 C DOT DSS FAMILY 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 LINE_SGN_FAILURE LLO MH_TM_OUT MTCE_BSY NO DIAL NO SEIZURE ACK NU OG RSTRCTN OVERLOAD PART DL REMOTE CONGN RING OUT ROUT OUT ORDR ROUT RECNT CHGNG RSRC N ALCTD RSRC N AVAIL SGN FAILURE SPURIOUS ANS SS BLOCKING ST COND SUCC CALL SWTCH BLOCKING SYS REC TO N PSBL XCHG INVC WORKSHOP ON C DOT DSS PRODUCTS REASONS OF CALL FAILURE Line signal failure This could be due to loopback removal Line Locked Out Manual Hold Timeout Subscriber Maintenance Busy No digits dialled No seizure ack received Called Number Unobtainable Outgoing Restriction Call failure due to overload detection Partial Dialling Remote Congestion Ring Time Out Route out of order Route Recently changed Resource Not Allocated Shortage of service circuits Resource Not Available Signalling Failure Spurious ans received on the trunk Space Switch Blocking End of dialling received Successful Call switching Blocking System Recovery Trunk Offer Not Possible Exchange Invocation 101 Annexure 12 Diagnostics of Memory Unit Whenever any memory unit goes oos sys then it should be brought INS ACT after proper diagnostics In some cases DIGNOSIS O K Report is not sufficient Memory may still go oos system
88. lock only ISD facility It will be implemented in next software release through dynamic locking 43 Traffic reports are confusing Data should be Implemented in next S W release available as in E10 B 44 Is it possible to connect PC to the IOP through CEMS will be released soon modem So that we can control 2 or 3 exchanges from Head Quarters 7 4 PROBLEMS RELATED TO 256P RAX 128P RAX SI PROBLEMS SOLUTIONS GET AROUNDS No 1 Media is 30 channel digital UHF The exchange Solved in 2 1 1 is 256T Exchange fails often After resetting or switching on off Exchange restores Reason is to be known RAP card of 256 RAX often fails other cards If it is due to lightning A change of IC can intact Earth value is 1 ohm Why protect RAP Contact C DOT Dynamic barring fails more often in 256 RAX Solved in 2 1 1 It has been made to understand that 90 calls Info is wrong For STD and Reg STD CRI F are to be treated as STD and the CRI for STD route calls to be given the value E instead of Both copies of RAX 256 working alright But the H W problem Try changing RSC RAP card of system changeover to simplex mode frequently the copy going OOS and after automatic recovery again it becomes Duplex working This problem is noticed in both RAX 256 In 256 RAX CDOT STD metering is taking For STD counter increment the CRI should be place but STD counter is showing 0 set to F for TAX Route When CDOT 256 is
89. lutions These problems have been categorised mainly in three different heads namely Installation Data Creation and Procedural 5 1 INSTALLATIONS RELATED PROBLEMS PROBLEM REMARKS 1 Earth Resistance It should be less than 1 ohm Earths for Electrical AC and Exchange earth DC should be laid separately T Two separate earths Minimal distance between the two should be ensured AC amp DC earths should never be allowed to get mixed up in the exchange at any point Inverter chassis should be grounded to exchange earth Antistatic Flooring Only antistatic material should be used It should be ground to exchange earth via 1 Mohm resistance Slippers should not be used while handling cards in the exchange 4 All the equipment to be grounded IOP BM LM MDF etc should be properly grounded as per the installation document High DC voltage drop at the IOP in Length of the supplied power cable from PDP to IOP is SBM systems 25M This leads to high voltage drop at the IOP Reduce the length of the IOP cable to actual requirement by cutting the cable and soldering it again 6 MCB at LM Tripping Inearlier supplied systems capacity of MCB is 10A Sometimes when the current absorbed exceeds 10A in the LM MCB trips Replace the 10A MCB with 16A New despatched systems are already having 16A MCB bo o WORKSHOP ON C DOT DSS PRODUCTS Chapter 5 PROBLEM REMARKS
90. ms enhancements requirements C DOT keeps on enhancing the hardware and software In the initial phases C DOT associates with the DOT staff to carryout this job which is subsequently done by the DOT staff on their own Generation of Software Deliverables New software in cartridges and PROMs is provided to various sites for upgradation of their software versions Cartridges and PROMs are generated in C DOT office and is sent by parcel wherever desired on replacement basis C DOT has spent 1364 Mandays at sites for installation and operation support to DOT in 12 months from January 1997 to Dec 1997 Mandays spent month wise are depicted in Fig 2 1 Problem Analysis for a representative month of November 1997 is shown in Table 1 Analysis of calls attended at Control Room for 12 months period from January 1997 to December 1997 is shown in Fig 2 2 C DOT DSS FAMILY POST CUT OVER MANAGEMENT SUPPORT FROM C DOT MANDAYS SPENT Jan97 Dec 97 Total Mandays 1364 200 193 180 160 143 140 120 104 97 100 87 80 74 65 40 20 0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 160 459 161 58 Mondays Spent at Site Fig 2 1 WORKSHOP ON C DOT DSS PRODUCTS 9 Chapter 2 Table 1 PROBLEM ANALYSIS FOR THE MONTH OF NOV 1997 Total Problems Reported 808 10 Hardware Related BM CM IOP IOP Peripheral Miscellaneous RAX Procedural RAX Data Creation IOP Related Man Machine Commands Utilities
91. n 0 as TAX ACCESS Note down value of OGCC for route 0 say OGCC 2 then for OGCC 2 ICCC 1 CRI should be F If CRI E is defined then STD counter will not update Allow special service to the subscriber For trunk offer facility to work in 256P RAX conference card CNF must be provided in slot no 7 of Master Frame and in TGP parameter trk offer facility yes amp operator TYPE Opr Trk Following steps to be done 1 Never switch off the Power Supply 2 Replacement or duplexing to be done in power on condition 3 Remove the standby RAP card out of service card and replace it with a good one 4 Ensure that the new card has the same software PROM checksum 5 Insert the card in the power on condition 6 Reset the new inserted card to boot 7 It will automatically take the data with meter reading from the active RAP and will become standby This can be due to following two cases A Wrong Data Creation If proper Charging Rate Index CRI is not assigned to OGCC of a WORKSHOP ON C DOT DSS PRODUCTS 65 Chapter 7 SI PROBLEMS No 27 In 256P RAX for testing TWT or E amp M trunks one trunk port is defined as test port If the port is faulty test result of all the trunk ports will fail 28 Manual reset does not work in RDC card particular route then excess charging can occur as under T This will result into uniform excess metering for all subscribe
92. n IOP 1 tries to establish link between AP 1 BP 1 on its HDL 1 port If HDL 1 of IOP 1 is not healthy or HDY 1 cable is bad or AP 1 BP 1 CPU card is not OK then IOP 1 will fail and go to OOS SYS state As a result IOP 0 will become INS ACT again For this following action can be taken i change HDL card of IOP 1 OR loop back Test can be done on HDL ports to verify ii change CPU card of AP 1 BP 1 li change HDY 1 cable between IOP 1 and AP 1 BP 1 or iv If fault is not rectified by any of the above actions then fault is in the BP motherboard or IOP s motherboard 95 C DOT DSS FAMILY Annexure 7 x Incase of interchange of BPs if the existing active IOP 0 fails and becomes OOS SYS then the link between IOP 0 and AP 0 BP 0 is not OK at its HDL 0 port Here also there can be three possibilities 1 HDL card of IOP 0 is not OK for HDL 0 2 AP 0 BP 0 card is not OK for IOP 0 3 HDX 0 cable is faulty So by replacing the items one by one fault can be rectified Provided fault is not in the mother board 96 C DOT DSS FAMILY Annexure 10 In MBM Exchange BM Not Recovering on its Own from Critical Status In MBM exchange BM8 say has suddenly become critical and not recovering of its own Various possibilities and action to be taken in each case are stated below A B C 97 Due to some transient fault in PSUs of TSU of BMS3 reloading may not start again Simply switch OFF ON both the PSUs in TSU frame
93. n be equipped giving 64 CO lines connectivity No hardware modification is required in the mother boards of the 256P RAX Software Configuration The firmware of 256P RAX is modified for its adaptation to DID application The software version 1 05 of 256P RAX is the base software Network Connectivity C DOT DID 256P RAX is connected to the network through CCM lines defined in Control office and CO Lines in RAX using Junctor card for O G calls as shown in Fig 8 1 Incoming calls are terminated on DID RAX through trunks which can be E amp M TWT or digital trunk WORKSHOP ON C DOT DSS PRODUCTS 71 Chapter 8 8 3 72 CO Lines IC Trunks Fig 8 1 CENTRALISED OPERATION AND MAINTENANCE COMaC Thus Centralised Operations amp Maintenance is a convenient and cost effective strategy for the network administration operation and maintaining the network C DOT s 256P RAX offers the flexibility for local as well Centralised Operation Maintenance The 256P RAX Centralised Operation Centre COMaC is a step towards today s goal of Telecom Management Network and function as a Telecom Management Centre for C DOT 256P RAX The COMaC functioning as a Remote Telecom Operation And Management Centre for 256P RAX consists basically of an PC connected on a telephone line through modem The COMaC software will be residing on the PC All the C DOT 256P RAXs to be controlled will also have a Modem connected to a telephone line from the 256P
94. n with 2 PCM streams As transmission media is being upgraded requirement for supporting more digital PCMs in SBM RAX and 256P RAX was felt Most of the SBM RAX exchanges are working as Group Dialling Exchanges with a number of 256P RAX exchanges parented to each This has necessitated the provisioning of more than 4 PCMs i e more than one DTU in such exchanges As DTU cannot be concentrated if all the Trunks are to be assigned then this would result in reduction of Subscriber Line Capacity Refer Fig 1 In addition since atleast one PCM has to be allocated between GDC and 256P RAXs the 30 channel PCM would remain under utilised in most of the cases as only 8 10 trunks are normally sufficient between SBM amp 256P RAX for optimising the use of the PCMs it is thus suggested that the additional DTU may be concentrated with the existing DTU Fig 2 to achieve a total of 8 PCM systems The other three TUsS can be concentrated as usual to equip 1480 lines These 8 PCMs will actually share only 120 time slots channels Also it is not mandatory to equip all the 4 PCMs in the concentration DTU While creating TGP data care should be taken to assign only the required number of circuits in each trunk group There is no restriction on the number of circuits in a TGP as long as the total number of assigned channels does not exceed 120 WORKSHOP ON C DOT DSS PRODUCTS 110 CONCENTRATION OF ONE DTU WITH ANOTHER DTU FRAME IN SBM EXCHANGE Fig 1
95. nalling SBM RAX MAX L MAX XL HARDWARE STATUS Initially the C DOT SBM RAX and MAX hardware have been commissioned at the sites with CPU S04 processor cards alongwith 4 nos of 2 MB memory cards in BPU and 2 nos of 2 MB memory card for SCU and APU As a part of continuous product upgradation efforts the hardware being used in the C DOT exchanges are being update time to time The few of considerations leading to hardware updations are listed below e Component obsolescence e Increased traffic handling capacity e Cost optimisation e Optimising the number of hardware modules for easy maintenance However these upgradations are not mandatory for the existing exchanges Till now successful efforts have been made that all the new software releases including latest Software release 1 4 5 43 3 are compatible to old Software and Hardware release with only one exception for C DOT RSU sites In case of RSU sites the 2Mb C DOT DSS FAMILY HARDWARE AND SOFTWARE STATUS memory cards being used in Remote BM RSU BM as well as in APU and SCU in CM are to be replaced by 16 MB TME card BMs in parent exchange can continue to have 2 MB cards Since all the C DOT SBM RAX exchanges are being despatched with new 16 Mb TME cards For the RSU sites TME card requirement can be met by inter changing the hardware at SBM RAX and RSU sites This will avoid any additional expenditure for the procurement of TME cards for RSU implementation at the
96. ns initialisation are 1 SOFT START During soft start OS DATA is reloaded All the processes in BP are reinitialised All the switch units are reinitialised Soft start has no effect on Subs Meter reading and dynamic STD facility 2 STABLE CLEAR In case any exceptions encountered in the read write area system may go for stable clear During stable clear all calls in that module will be terminated OS is restarted and units are reinitialised Read Write data is reloaded from IOP to BP AP Read write data includes administration call processing Meter Reading is not downloaded Subs having dynamic STD will not be affected 3 PART INIT Under part init all the read only as well as read write data is loaded from IOP to BP AP Here all the data related to Exchange Data Base Administration Call Processing and Maintenance is reloaded All processes are initialised in BP AP All the units are reinitialised Here Meter Reading is also down loaded to BP All the STD subscriber having dynamic locking facility will get locked 109 What is the difference between init sys and init mod command In case of SBM exchange function of both the commands is same In case of MBM the two commands have different effect 1 INIT SYS when init sys command is given in an MBM exchange the whole system AM CM amp all BMs is initialised upto the mentioned init type level 2 INIT MOD Init mod is meant for individu
97. nt can be observed for spare nos time to time There should be s w for taking direct bulk counter of all nos from IOP to common PC i e in foxbase meter reading program so that manual billing of meter reading can be avoided Is ringer based PSU required for DTK BM As there ringing current is not required Whenever STD facility granted to sub with dyn lock then the lock will be in open condition instead it would have been in lock condition as it happens to maintain staff to physically go in switch room amp lock Some of the subscriber facilities which are not available should be marked Detailed Billing should be available on O G amp I C TGPs also so that detail bill could be generated for 256P RAXs connected to SBM TAX MBM ILTs Automatic backup for dumps for Ed amp bd once a day should be provided There should be ring discrimination for Local amp I C ISD calls just like available in OCB exchange STD ISD subscriber having dynamic control should not get locked after giving part init code load to the system BM TGP traffic report should be available through rgen utility Meter reading should be associated with Implemented in next S W release directory number It is desired to reclassify the command classes It should not be possible to go to 5C or 5D prompt from operator account Dynamic locking procedure should be similar to E10B i e 124 XXXX etc COMMENTS Next S W will ta
98. nts 1 4 1 3 Bulk counter for each subscriber has been provided for total meter readings Local STD No charging of single unit in case of partial dialling for STD ISD calls Media Network related problem but taken care of at C DOT exchange Problem is solved for MF routes Problem can not be solved for DECADIC Routes Actual charging for calls in the cases WORKSHOP ON C DOT DSS PRODUCTS 15 Chapter 3 16 Dialling by Equipment Number Call Kill call Making the involved terminals OOS OPR Disconnection of call because of network problem Enhancement for Commercial Bill Records Records for a particular day can be deleted Enhanced Traffic Reports 1 4 1 3 Route Code Report Hunt Group Report Both way trunk group report SIF Traffic Report To interrogate the utilisation of different subscriber initiated features i e Dynamic Locking Morning Alarms Call Queuing etc DTK Traffic Report RSU feature Equipage availability of voice channels between RSU module and main exchange Traffic intensity between RSU module and main exchange Enhanced Maintenance Support 1 4 1 3 Simultaneous down loading of code and patch for 16 BMs for faster restoration of services in case of exchange failure This will reduce installation time also Modified patch initialisation strategy for down loading of patch files in very short duration Terminal Fault Handling Alarms for
99. number of subscribers under LLO PG condition exceeds threshold value Interrogation OOS EXT subscribers Alarms for killer trunks amp service circuits Functional test on MF circuits for all the frequency components Enhancement of answering circuit report to include more details of failures C DOT DSS FAMILY HARDWARE AND SOFTWARE STATUS Different thresholds for small medium large trunk groups to raise clear the alarms Remote alarms reporting fault monitoring from subscriber line Fine tuning of subscriber line parameters as per the condition of outdoor cables network This can also be defined by the user Fine tuning of the call handling capacity by optimising the call processing and improved over load control management strategy Enhanced over load control reports along with more details which will help in on line over load control management It will not be possible to delete bd group through crp x It will be possible for AP BP to establish link with OOS OPR IOP when the active IOP becomes OOS SYS 3 3 2 New Software Release 1_4_5 43_3 1997 This release supports Regional Access Level 90 feature in addition to all the enhancements incorporated in 1 4 5 23 3 New features introduced in this release are listed below 16 PCMs connectivity between RSU s amp Main Exchange Trunk Interface in RSU IOP VH Hardware Support Booting of IOP with Unix Cartridge as minload floppy not required now
100. o is not possible to test a line card without be put oos for removing one card to test another assigning directory number card using this slot Facility will be provided in the next release In the malicious call observation report zeros This is not a problem It is the implementation are added alongwith numbers as desired by DOT However extra zeros are to be ignored Sometimes card id given by diagnostics report Limitation of Diagnostics in certain cases are not correct for BMs Only last two ports of CCM can be used for It is a constraint at present 16KHz metering pulse How to calculate the requirement of DTMF Contact C DOT circuits MF senders MF receivers in an Exchange How to see the meter reading of free TENs Not Implemented in next software release associated with DIR nos Threshold alarm is not available for STD calls This is being implemented in next software of long duration release What is the maximum length of IOP to CM Assembled cable of length 35 mtr is supplied It signal cable Whether normal switch board is a shielded cable The normal switch board cable can be used for this purpose cable is not recommended CPU S05 replacement procedure and cut strap Modification at BID card is not mandatory t BID card a a Procedure of replacement of CPU S05 is same as of CPU S04 card In Trunk BM is it possible to use all the TUs as Yes it is possible to use it subject to maximum digital TUs o
101. o IOP s 5 ADP 5 Procedure of conversion 76 C DOT DSS FAMILY 8 7 ENHANCEMENTS FROM C DOT CONVERSION OF EXISTING SBM S TO MBM This configuration has been shown in Fig 1 1 The existing SBM exchanges will continue to work in the same configuration in Suite 1 SBM 1 Suite 2 SBM 2 Suite 3 SBM 3 These suites will be converted to accommodate fourth cabinet by adding additional rack structure as shown in Figure by dotted lines LMs of BMs will have all the six TU s fully equipped instead of three at present All the trunks from SBM1 SBM2 SBMS will be shifted to BM 2 and BM 6 Trunk BM s so that in 1 4 concentration the existing SBM will cater to 2024 subscribers LM2 of SBM2 will be concentrated with BM4 additional and concentration will be 1 3 so these two BM s BM3 and BM4 will cater to 2512 subscribers With BM of SBM3 one LM will be added in 1 3 concentration This will enhance the total capacity to 5792 subscriber lines 240 Digital Trunks 720 Analog Trunks For further expansion one more half suite may be added to as per Fig 2 2 to enhance the capacity to 8300 subscriber lines Battery amp Power Plant For both the proposals battery and power plant of existing SBM s is to be upgraded as per MAX L configuration Details given in the enclosed Annexure 6 AC requirement Centralised AC will be required for operating MAX L Cables The requirement of power cables including cables for distributing 48V from switc
102. ommand affected commands restoration STD ISD amp DNP R DNP DSC RDSC mod lin sta DSC subs also put under BNP DISC gets BNP This is as per TEC specs annc when lifted phone Vendors for ESM ESL amp ETS card All approved C DOT venders Vendors for IOP latest version Refer Annexure 18 Sending double pulse to remote caller at some of In charge rate no to be used for satellite the routes at the time of answering and no exchanges make initial change as 0 metering pulse afterwards in group dialling Some of the calls on ISD routes failing and CLI 256P RAX SBM amp MBM support CLI sending is required by higher order TAX Whether ISDN facility available in CDOT It is available in next S W version 2 1 1 1 MBM Why only forty jns are kept in one tgp with C DOT implementation is like this which the tgp status cannot be seen if jns are more than forty Tone test gives no metering on local call Implementation is done that way Command file execution in calendar is not Limitations To be implemented possible Please try after some time to be removed from Implemented in next s w release BNP Announcement Can we have a list of all STD ISD subscribers at Yes in S W P5 43 displ sub list command can any time be used to get correct list of all such subscribers Through rgen also we can have the list using script file linchr Is is possible to provide Morning Alarm Yes all
103. ow give following command on any of the INS IOP to initialise the system up to part init lt INIT SYS 5 in case of SBM and lt INIT MOD AM 5 in case of MBM This will clear the pending alarms WORKSHOP ON C DOT DSS PRODUCTS 88 Annexure 6 Problem Related to Corruption of apdtkr bin File in 1 4 It has been observed in SBM Exchange having S W Link 1 4 Whenever system goes for data loading it fails to recover The last file displayed while data loading is data exdata prcdata apmodl bin Next file to be loaded is data exdata prcdata apdtkr bin which gets corrupted Note Do not give reset to BPs at this stage The solution of this problem is given below 1 Bring the active IOP to warm start level 2 Check disk space and create free disk space in both IOP s if required 3 In last active IOP give following commands IOP5x gt cd PRCDATAP IOP5x gt mv apdtkr bin oapdtkr bin Insert BMDC cartridge in the cartridge drive IOP5x gt cpio icvu data exdata prcdata apdtkr bin lt TAPE The file copied and total no of Blocks of BMDC will be displayed Remove BMDC cartridge from cartridge drive e IOP5x gt ls ls apdtkr bin This will display the file apdtkr bin 4 Go to crp and give command lt init iop 5 1 As soon as the IOP becomes INS ACT the remaining files will get downloaded and system will recover 89 C DOT DSS FAMILY Annexure 7 BM Going For Frequent Initialisation At SBL CLR Level in S
104. pl Service in DOT Check DCBR in ncbr and add it to meter counter in Bill manually Implemented in next s w release Problem with traffic reports to be taken care by CDOT in next release Not available in SBM MBM S W Will be implemented in next s w release Suggestion Noted This is not possible as only 4 TICs can be equipped in one chain 2024 subs in line BM i e only lines CLI possible on MF signalling route It should have MF signalling in whole chain Possible Some components in some cards have to be replaced Combination not allowed because both use flash 56 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SI 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 No QUESTIONS COMMENTS under mal obs unless TRM facility is Implemented in next s w release withdrawn At present 2 units are charged at the time of Implementation is like this only as per TEC registration If we register the alarm for more specs than one day i e 10 days or 20 days then only 2 units are charged on the day of registration and subsequently usage will be there and no charging It is said that one time slotin ANNC is used That time slot is used for maintenance for control purpose including that of extending any annc from the start position But annc do start from anywhere Com bill not appended with commercially Use displ trans c
105. printer per IOP so details may be given At times IOP goes to DISPL UPDATE ALL This level of IOP will come only when level when command Mod Sub Ten Mod Sub overloading is there in the system Dir given From any terminal with restricted privileges In addition to the operator password terminal the operator can go to 5C or 5D prompt and can password can also be used to restrict the do operations operator In future releases operators will be going to CRP prompt directly 14 While loading s w error comes get help perhaps Cartridge drive or tape problem It is a read c option to be used error In sync operation some message like cannot First time after loading of S W For IOP Sync unlink IO map file failure refer Annexure 8 BC backup taken in 8 9V IOP cannot be copied Use over rel option in copy in command and on new IOP hard disk with which Emc case create directory becomes problem Whether the following command can be used u rell 35 data dump before copying cpio icvud TAPE For restoring data from tape to disk for new version Some of the used cartridges earlier BC taken amp Nullify the cartridge amp use Expiry Over option kept for one year cannot be reused for writing while copy out present BC backup In IOP VL how the disk is formatted For low level formatting give command IOC6 4 fd w0 Ignore time out message For actual formatting Give Y when system asks wan
106. r and not individual subscriber meter spurt B Wrong Maintenance Procedure L Under such condition change the test port and confirm the results Normally Reset works all right May be due to one particular card having this problem SOLUTIONS GET AROUNDS Only for the local exchange subscriber and normal for subscriber of the satellite exchange Excess charging for the satellite exchange subscriber and normal for local exchange subscriber Excess charging both for the local subscriber as well as the satellite exchange subscriber Frequent switching ON OFF the power supply can result into spurt metering for individual subscriber randomly Different version of software PROMs used in both cards Wrong procedure adopted for replacing out of service RAP card Suppose one RAP card of some other side or RAP card out of service for a long time will have different meter reading Now if the system is switched off before replacing the card then it is possible that when the system is switched ON it may boot up with new inserted card and system will have a different meter reading This will also copy the meter reading on the previous active RAP card This will result into excess under metering Then there will be no way to recovers the original meter reading Correct sequence to be followed for replacement of card is given in Problem No 1 Frequent tripping of the Float rectifier and battery take over can result into spu
107. r these problems have been taken care of in the new phase of hardware 16MB TME Card Help can be sought from control room to identify the card if c log utility is not available 79 Problem of over loading of exchange are Observation is not correct M F tone dialling observed if DTMF facility is given to more than facility can be given to all subscriber in the 200 subscribers exchange However it is advised if this facility is given to subscribers they should be advised to use it otherwise it may lead to overload problem 80 Trunk BM is getting over load during busy Refer Annexure 2 hour 81 In case of overload DT disappears for 10 15 In case of overload system may go for minutes STD dynamic locked automatically if initialisation with level stable clear CPU subs are not using this manual reset during this situation will cause system to go for code load which will cause STD locking So avoid giving code Load Part init as far as possible 82 Automatic withdrawn of STD facility when any System initialisation with part unit or above software or momentary problem will occur in causes STD locking for security reasons any BM for those subscriber who never lock Subscriber should be educated to unlock STD their STD using their secret password 83 Delayed dial tone in particular concentration Enable switch network Traffic report amp check WORKSHOP ON C DOT DSS PRODUCTS 39 Chapter 7 SL NO 84 85 86
108. re should not be indefinite loop like digits are received in C DOT exchange A and we are passing these digits to exchange B Exchange B gives back to C DOT exchange and C DOT exchange gives again to Exchange B which makes an indefinite loop In these type of cases recovery will come due to wrong creation of data This can be avoided by allocating different TGP CTGRY for I C TGPs One of the reasons may be corruption of Annc Data Refer Annexure 7 for the solution Check system status or observe from OOD printer whether some switch units specially memory unit going OOS SUS frequently This may also be the cause for system to go for Recovery upto SBL CLR with SRF counter over flow Force these units OOS OPR the system for stability Bring these units INS ACT SBY after thorough DGN Check whether any fresh data creation regarding Routes or Trunks has been done Confirm the data creation with C DOT control room Otherwise revert the changes done in Trunk amp Route Data Verify I C TGP category from Main TAX or TAXES other than one In case of SBM TAX all the I C TGPs should be configured as ORD in the parameter TGP Type Only O G TGP towards Main TAX should be of T TAX Type Another reason of SRF counter O F may be due to corruption of Trunking Data One of the solution is to load few days old Ed in the active IOP at warm start level and then giving part init to the system using init mod
109. red A detailed document giving point by point procedure to upgrade is available 8 2 DID FEATURE IN C DOT 256P RAX In order to reduce the big gap between demand and supply of direct exchange lines DELs DOT has conceived the idea of providing PABX lines with DID facility so that better use of cable network and switching equipment can be made Private operators can now install switches to provide telephone services under license from DOT C DOT has provided the features and facilities as specified in the TEC specifications in 256P RAX by suitably modifying the software This document provides the details regarding hardware and software configuration of the system features and facilities provided connectivity to the network and PC based post processing of DCRs Hardware Configuration The hardware of 256P RAX is used for DID application Controller cards used in DID RAX are same as used in 256P RAX Terminal cards like LCC TWT EMF and DT30 can be equipped depending on the requirement and connectivity to the PSTN Connectivity of DID RAX to the PSTN is for incoming and outgoing calls For outgoing calls the junctor card is used which can receive 16 KHz pulses from the connected exchange on all eight ports For incoming calls the connectivity to the PSTN can be through Two Way Trunk TWT EMF or 30 channel Digital Trunk The junction card APC JUN081 T S03 be equipped in any termination card slot and maximum of eight junction cards ca
110. rs Otherwise keep T TC oos opr while subscriber creation or TGP creation 115 Finding some problem when TRK TU is When concentration done with Trunk TU less concentrated with local nos in LM2 No of Time slots will be available for subscribers in concentration Reduce No of subs or Trunks 7 1 8 General Maintenance and Utility Related Problems SL NO PROBLEMS REMARKS 116 117 118 119 120 121 Alarm on OOD and ADP hangs Though there is no alarm in the exchange Automatic Routine testing of Subscriber s line and Trunk is not possible by Calendar Management Announcement of Kundais Exchange SBM ver 5 23 Sentences are incomplete Without granting STD facility STD is getting for 3 nos in a slot For that replaced card LCC TIC etc but no use What is to be done TWT ports getting blocked faulty and becomes NDT whenever we break isolate lines on MDF or on Trunk lines for lineman testing change of jumpers etc In this case we delete the circuts and add again Some dir no gone to INSF AD BSY when made out and IN then also no success By changing Take the following steps 1 Run Audit Set 12 2 Put ADP OOS and then INS 3 If the alarm is still persisting then put the unit for which the alarm is pending out of service and then inservice If the alarm is still persisting follow the procedure enclosed in the Annexure 5 Will be Taken care in next software release
111. rt for individual subscriber meter 66 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SI PROBLEMS SOLUTIONS GET AROUNDS No 29 On route 0 it is possible to create only eight 256P RAX is not supported to work as TAX in routs the network Eight routes on level 0 are bonus 30 Maintenance panel not working for copy 1 All e Check RAP 1 card by replacing it Check the cards are in good condition cable from MP to Mother Board Check by replacing MP also e Check RAX MP link at Motherboard for copy 0 138Bb24 Tx 2Aa2 13BC24 Rx 2Ac2 copy 1 14Bb24 Tx 2Aa3 14BC24 Rx 2Ac3 31 Digital trunk in CDOT 256 with 1 05 version is Solved in 2 1 1 for RAX amp 5 43 for SBM MAX not working with CDOT SBM CDOT MAX ILT with 5 23 version in all types of signaling 7 5 INFORMATION REGARDING 256P RAX 128P RAX ka QUESTIONS COMMENTS 1 Level 9 detailed billing facility not available 2 CDOT 128 ROD from parent exch to terminate exchange could not be kept as 1 3 Only ISD baring facility not available in CDOT 256P CDOT 128P 4 MF register in CDOT 256 inadequate MF register shows failure 5 DCR blocks insufficient 6 In 2 1 1 version if any mischievous person has changed the SU PW purposely what is the solution to Log In 7 In COMaC the following observation are made 1 Modification on MF channel cannot be made 2 Testing of subscriber lines exchange and external exch
112. s For the problems which can not be solved on phone site visit is planned to take detailed observations and fixing the problem In addition to installation and Maintenance activity C DOT conducts one week condensed hands on maintenance oriented training programs as well as workshops on C DOT Products at circle level for the DOT staff The other support provided by C DOT is as follows Release of Application Notes C DOT prepares Application Notes for various field requirements Application notes on the following topics have been released so far e Software Installation and Data creation e Description of Traffic Reports e Procedure to Recover SBM MBM exchange e Concentration TIC Trouble shooting e Digital Trunk Equipage in Line Module e Hard Disk installation e Switch Units and Associated Cards e Report Generation CMD Utility Floppy e SBM TAX WORKSHOP ON C DOT DSS PRODUCTS 7 Chapter 2 e Expansion of C DOT MAX L Exchange e Replacement of 1 2 GB 2 1 GB Hard Disk in IOP e Basic Programming amp Data Creation in 256 RAX e Conversion of SBM into MBM e Bill Monitoring Utility Training support Regular support to ALTTC for some topics Lecture support is provided to RTTCs whenever desired Release of Software Tools Utilities C DOT keeps on releasing some small utilities which are helpful in expediting the installation work or easing the maintenance works Software Hardware Upgradation Based on field proble
113. s Corporation of India Ltd Works Mr P Appaji Rao Head Telecom Div Computer Group ECIL P O HYDERABAD 500 062 Corporate Office Dr C Rao Kasarabada CMD ECIL P O HYDERABAD 500 062 Delhi Office Mr K S Mittal DGM Palicak Bhavan Sector 3 R K Puram NEW DELHI 110 022 Gujarat Narmada Valley Fertilizers Co Ltd Works Mr A L Vidyasagar Exe Director Mr K N Pathak Senior Manager P O Narmada Nagar Distt BHARUCH 392 015 Works Mr A M Bhardwaj WORKSHOP ON C DOT DSS PRODUCTS Phone 080 425206 080 425208 080 6683969 022 2676610 011 3711112 011 3730918 011 3739903 040 7123778 040 7120131 Extn 3234 040 7121055 040 7120131 011 6889848 02642 47001 02642 47002 02642 47129 091 40 7121897 091 40 7123778 091 40 7122535 091 2642 47116 091 2642 47057 113 Annexure 18 114 Manufacturer MD P O Narmada Nagar Distt BHARUCH 392 015 Delhi Office Mr S K Gokia DGM A 1 288 Safdarjung Enclave Near Kamal Cinema Complex NEW DELHI 110 029 Hindustan Teleprinters Ltd Works H O Mr S S Shekhawat SGM R amp D G S T Road Guindy CHENNAI 600 032 Corporate Office Ms Lakshmi G Menon CMD G S T Road Guindy CHENNAI 600 032 Delhi Office Lt Col Pushish Srivastav DGM Cordination amp Dev 8 19 WEA Smile Chamber IInd Floor Karol Bagh NEW DELHI 110 005 Indian Telephone Industries Ltd Bangalore Electronic
114. s ILT Since the C DOT MAX ILT is a product of C DOT DSS family with the same Hardware Software the existing C DOT DSS MAX exchanges can be converted into MAX ILT for performing the TAX functions Conversion of C DOT MAX to MAX ILT may lead to additional requirement of trunks The trunks capacity can be increased by inserting the additional trunk cards in the vacant slot of existing Base Module Trunk If the additional requirement of trunks cannot be met on some sites with the existing base module either due to non availability of vacant slots or limitation of BHCA handling C DOT DSS FAMILY ENHANCEMENTS FROM C DOT capacity of that trunk module then additional Base Module Trunk is to be planned as per site requirement Type of BM Trunk to be added will depend upon the type of trunks required Procedure for Conversion of MAX into ILT Note Do physical installation of Base Module Trunk Add all type of cables Put one IOP OOS Add base module Trunk Create all the data in this IOP Modify system parameter to configure the exchange as ILT MOD SYS PARAM XCHG TYPE 32 Modify system parameter OWN STD LEN to length of TAX code say 4 for 0141 code Split route 0 by first deleting it and then creating all the desired route on level 0 where different charging is required Draw a charging matrix of different TAX route for which charging is to be done and implemented it on routes with different categories and charge rate numb
115. se are not required and were not there in 8 9 version SW units faulty showing on ADP But in sys All SWU status showing ins act ins sby units are actually faulty In 5 23V please give the commands for to copy in the disk from catridge BC for taking Rgen ncbr for EMC cases To remove the unwanted BC to create space on the disk When putting IPMs some times the lines are getting disconnected When no is created the no is going to OOS SE Can we convert TWT cards as LCCs While deleting a subscriber with del sub command in some cases it is found the sub is under NBR CNG observation and it is not possible to delete Exact no of subscribers having STD ISD facility will not be obtained by displ sub list command MEM DGN abort sometimes even if TME is mounted In an MBM while taking the detailed bill of a no it is found that calls made exactly 1 year before is shown now It is suspected that BC for that period might not have been deleted In all exchanges test no is created eg 835111 On dialling the test no after 2 cycle the call is COMMENTS assigned will come into picture Beep should be disabled according to DOT policy by defining No Beep in crg rtn It is implemented so Progressive Hunting is within the PCM and sequential across the BMs Copy out Copy in commands are required to be monitored so these are put in transaction log When a unit is put under OOS SUS the alarm
116. sfully changing the key word This happened twice in all the cases We killed PID for SIF Suppose we want to execute rgen ncbr from 0000 hrs current day it is showing calls made by subscriber before 0000 hrs also call made by the subscriber in the period 2300 hrs 2400 hrs last When large no of LLO subs are there ADP goes out During Software loading audit report is OK but if separate audit is taken of patch then it shows list of missing files Repeated alarms regarding TGP failure on ADP OOD printer After formatting the Bill counters meter reading shown by report bill counter is not current as shown by display sub mtr In S W 1 4 5 43 3 whenever a BM is initialised all the TICs which are not equipped appear in the system status REMARKS SIF related problems have been taken care in 5 43 Such calls have originated before 0000 Hrs but got completed after 0000 Hrs So these are registered in the next date This will be corrected in the next S W Link Under analysis i Separate audit should not show any files missing although it may show few files extra or modified ii IOP should be formatted and re loading of S W to be done In S W 1 4 5 43 3 the number of system parameters responsible for raising clearing TGP alarms have been increased from 3 to 21 Now 7 types of alarm limits are provided for each of the three type of TGP s i e Small TGP Medium TGP amp Large TGP In case the
117. sts 5th closing high 60 msec 5th closing low 16 msec 5th opening high 100 msec 5th opening low 42 msec Dial Ratio high 4 Dial Ratio low 1 Dial Speed high 12 IPS Dial Speed low 8 IPS WORKSHOP ON C DOT DSS PRODUCTS 107 Annexure 16 Prevention of Damages due to Lightening by Correct Grounding of Inverters There has been incidents of lightening affecting RS 232 interface in the IOP controler card and serial interface card interconnecting IOP and VDU Wrong earthing of interters results into voltage surge affecting the digital ground which further causes damages to IOP cards VDUs and printers etc In order to prevent such damages C DOT recommends following modifications 1 Inverters working on 48V exchange DC must be provided for feeding AC to VDUS amp printers instead of using commercial mains supply 2 The inverter should be DOT QA approved and should have over voltage protection at the output 3 The chasis ground of Inverters should be connected to DC Earth Plate instead of AC Earth Plate Note Refer figure 1 for correct grounding scheme for inverters VDUs IOP amp printers WORKSHOP ON C DOT DSS PRODUCTS 108 PREVENTION OF DAMAGES DUE TO LIGHTENING BY CORRECT GROUNDING OF INVERTERS Fig 1 WORKSHOP ON C DOT DSS PRODUCTS 109 Annexure 17 Concentration of one DTU with another DTU Frame in SBM Exchange In the present configuration SBM RAX exchanges support either pure analog trunks or a combinatio
118. t to format Y N Bad block entry is not required 19 For IOP VL EPROMs in VCP card has been Type 27C4001 is not correct for IOP VL It shown as type 27C4001 in Retrofit document should be 27C010 or 27C020 type Type Whether it is correct or not 27C4001 is to be used in IOP VH only WORKSHOP ON C DOT DSS PRODUCTS 51 Chapter 7 7 2 2 Utility Related Questions S QUESTIONS COMMENTS 20 It should be possible to get the meter readings Utility will be made available soon for a group of numbers e g PCO numbers through rgen 21 Create space utility mentioned in literature but Provided with RGEN utility floppy not available 22 Inrgen utility we are not getting rgen ictgp Use modified version of regen V7 2 and rgen ogtgp reports though the tgps are in multiples of four 23 In 5 43 S W rgen linchr for NAT is not coming Displ sub list command to be used or new rgen for 5 43 to be used 24 Traffic information not getting on rgen for both Available through new rgen version 7 2 way tks 25 Latest version 5 23V tape copy is not working Rgen version 7 2 to be used 26 Rgen edreld gives calling ten called ten Use cdrcln for monitoring the O G trunk more useful for monitoring o g ccts performance performance through backword signal absent O G Ten to be included in the script file 27 Displ cdr shows timings in hexa which is cryptic Use rgen amp not useful 28
119. the subscriber can be provided with this facility to all the subscriber of exchange facility Is it possible to feed different announcement No It is not possible right now but new WORKSHOP ON C DOT DSS PRODUCTS 57 Chapter 7 ls QUESTIONS COMMENTS e g wishing you happy new year etc announcement card is being designed 99 How many subscribers can access 162 at a Only one subscriber per BM time 100 Is it possible to charge CCB LCL and normal Yes For local CCB sub sys parameter pco mtr subscriber differently Say CCB LCL having 5 Icl is used While Lcl sub mod sub crg is used min metering and normal subscriber fixed metering 101 If on TAX route TGP ROD 1 and min digit Min digit seize forward will decide the time of seize forward 2 or 3 or 4 What will be the seizure of the trunk If it is 4 instead of 2 it will effect on seizure of ckt and will this lead to reduce the abandoned traffic on TAX route overloading in the exchange 102 How to get following 1 Total traffic of Exchange Total attempts in Exchange Performance Report TGP wise total traffic is available 2 Total traffic TGP wi DURS T Local traffic will be taken care in next 3 Local traffic software version 103 Is it possible to get rejection of calls on a By putting route under observation using MOD particular route Can we get the revenue for ROUT OBS command it is possible to get the route
120. ting deleted in one IOP If a particular TC slot made OOS and INS the subscribers std facility locked Then we have to withdraw WTD the sub facility Version is 5 23 msg read free poolnull continuous message Copy out gt executed but displ tap info says it is not in proper format Login prompt not coming on any of the three terminals connected to IOP 0 on ports 3 4 amp 5 when terminals are added using add trm command error message comes Terminal already existing Hard Disk of one station going frequently faulty What can be the reason Floppy drives amp cartridge drives becoming faulty Some time IOP not coming out of IOP5X prompt as error comes control D not found Both the IOPs work alright in simplex mode but do not come in duplex mode During duplexing synchronisation gets aborted after message IOPs are in Duplex Traffic files have been deleted The only working IOP is not accepting any commands rather only cursor is there on the video screen of console terminal There seems to be no alternative but to give reset again Is it correct REMARKS Hard disk problem Hard disk can be formatted with the existing bad blocks or the new bad block can be added to the existing list There after complete loading of S W can be done For solution contact C DOT Solved in S W version 5 43 The unit being tested may be faulty Shut down Re boot IOP Cartridge Cartridge Tape Drive pro
121. to a telephone line from the respective SBM MBM This modem has a RS 232C link with the IOP of the exchange The CEMS can thus initiate a telephone call to distant exchange Modem and can interact over the telephone line with the IOP of the exchange In the PC CEMs software runs over MS DOS V6 0 and WINDOWS V3 1 own ward IOP of the remote exchange to be monitored must have RGEN V6 0 utility loaded into it C DOT DSS FAMILY ENHANCEMENTS FROM C DOT The salient features of CEMS are e Automatic Data Collection from Exchanges using schedular facility e Post analyses of the stored data in various graphic representations using user friendly graphic user interphase e Collection of various category Alarms Report from exchanges e Remote Login facility to enter CRP of IOP and executing any CRP command for Trunking Routing Subscriber Line Administration and all other exchange operations e Collection of Billing Data from the Remote exchange for preparing amp monitoring Billing Record WORKSHOP ON C DOT DSS PRODUCTS 79 Chapter 9 Conclusion The format designed by C DOT for holding these work shops aims a free and frank exchange of information related to Installation Operation and Maintenance of C DOT switching equipment C DOT on the basis of feed back available from internal evaluation evaluation of TEC and QA Feed back available from manufacturers data being logged at the C DOT control room based on interaction with
122. uld be If it is not done this will unnecessarily load the system provided to the subscribers where in software data DTMF facility is given Also subscribers should be educated to use the DTMF feature Rerouting of calls coming from TAX I C TAX TGP category should be other than 1 and this to TAX again category should not be allowed on the O G TAX route Otherwise calls will be routed from TAX to TAX again leading to charging problems 5 3 PROCEDURAL PROBLEMS PROBLEMS REMARKS Proper synchronization procedure OOS IOP should be made INS through the active IOP only not followed e g INIT IOP 5 1 on the OOS IOPs Short cut procedure to bring down Leads to data corruption Proper shut down procedure should the IOP by switching off the power be used init iop 2 1 and init iop 1 1 should be used or by resetting for bringing the IOP to cold start ed bd and bc backup is not taken Loss of meter reading data during exchange restoration after regularly complete failure in cases where loading of software is required Disk cleaning IOP Synchronisation failure takes place if no space is available on the disk Proper cleaning should be done before synchronisation Replacement of cards Ensure the following Hardware Compatibility S W version of PROMs Jumper settings if any Switching off the PSU Ensure that all the switch units being served by that PSU have been made OOS OPR otherwise those units will become
123. ulty or concentration cable between upper TUI and this TUI are bad In some cases ACT TIC may be faulty This type of observation is caused by noise in the links In such a case self or upper TUI can be bad or concentration cable between upper TUI amp this TUI are causing transient noise fault So replacing TUIs or concentration cables will settle the fault For BP diagnosis BMS does not come into picture In such a case following possibilities are there a SBY BP is having different S W EPROMs b SBY BPs links are not OK with active BMS c SBY BPs links are not OK with memory Problem can be solved by 1 Changing CPU card ii Changing BIC card of SBY BP iii Changing BID card of the self Memory Unit iv Interchange ACT BMS unit Fault may be in TIC card itself which is unable to detect PSU presence In such cases TIC card itself is bad and needs replacement WORKSHOP ON C DOT DSS PRODUCTS 37 Chapter 7 SL NO PROBLEMS REMARKS Diagnostic of TIC is OK but ring is not As SPC diagnostic is not fully covered during tripping TIC diagnostic No ring trip fault can be due to ACT SPC fault In this case changing SPC card rectifies the fault 67 Auto Ring test by dialling 162 is failing TTC in the particular BM is faulty for 162 purpose TTC may remain INS ACT status despite this fault 7 1 3 Billing Related Problems SL NO PROBLEMS REMARKS 68 i Detail Bill not avai
124. ut TAX TGP under traffic observation using mod tgp obs command Then take traffic report for O G trunk using displ trf rpt In these TGP reports for most busy Hrs note down traffic in Erlongs If this Erlong figure is divided by WORKSHOP ON C DOT DSS PRODUCTS 82 OVER LOADING IN TRUNK LINE BM 0 5 then this will give you the no of trunks required in that particular TGP Then the Trunks can be increased accordingly No of Trunks towards TAX direction is sufficient but still over load is there In this case it is possible that calls are failing either due to individual channels Trks fault or some particular routes ungettable Here individual channels trunks can be blocked to improve call success rate and thus automatically reducing repeated attempts If the calls are failing on individual routs data creation should be checked at own end distant end to rectify the fault WORKSHOP ON C DOT DSS PRODUCTS 83 Annexure 3 Problems Related To Route Inconsistencies We will now discuss the route related inconsistencies Usually route related inconsistencies are very much interlinked and it is not advisable to do modification file wise If there is some inconsistency which cannot be bypassed then entire route related files are copied from BMDC and routes are created again Before doing that note down the characteristics of all routes Procedure for copying from BMDC is as follows 1 2 3 Bring SBY IOP to warm level
125. ven if we change the TTC by good one it is not testing the any sub line of the BM WORKSHOP ON C DOT DSS PRODUCTS 45 Chapter 7 SL NO 134 135 136 137 138 139 140 141 142 143 144 PROBLEMS In rgen sub utilities in the parameter dir no it is better if amp option or from to is introduced instead of a single no or a continuous set of nos Incoming traffic in all directions showing very low We have physically verified incoming traffic and calls are effected well but it is not recorded as actual figures other end o g traffic efficiency in same circuits is greater than our incoming traffic ISAM error is rewrite 0 x 6f 0x22 continuously rolling on the screen on active IOP If the IOPs are interchanged the same problem appears in active IOP Self ring 162 not working Only engage tone coming when tried for 162 In call waiting facility the 1 party is disconnected when the 2 4 party is on line when tapped the hook switch If the STD code of a station is 5 digits while creating o g TAX TGP it is not possible to give AC INFO as there is provision for only 7 digits Ex 08818161 8 digits While using DATPAT for viewing temporary out of service numbers using the file iotosd no record for the key value is showing even though the given DIR NO is in TOS status When a trunk port is in INSF LLO status it is not coming to INSF FREE even
126. ware and software status has been covered Chapter 4 exclusively deals with Regional Access Level 90 implementation in detail In Chapters 5 some known field problems related to installation Data Creation and procedure have been listed Chapter 6 deals with Do s amp Don ts Chapter 7 deals with the field problems enhancement reported during the workshops done by the C DOT Chapter 8 covers most of the enhancements being propagated by C DOT WORKSHOP ON C DOT DSS PRODUCTS 5 Chapter 1 Table 1 ALLTC Ghaziabad Andhra Pradesh Kakinada 75 Hyderabad 32 Bihar Patna 26 Ranchi 26 Gujrat Ahmedabad 33 Rajkot 25 Kurukshetra L a Himarchal Simla 33 Pradesh Mandi 27 Madhya Pradesh Bhopal Raipur Tamil Nadu Thiruneveli Salem U P East Kanpur Azamgarh U P West Merrut Agra Maharashtra Kolhapur Goa Nanded Pen 6 C DOT DSS FAMILY Chapter 2 Post Cut over Management Support from C DOT In the National Telecom Network all the C DOT exchanges are installed and subsequently maintained by DOT staff C DOT provides requisite support to DOT in Installation of exchanges Expansion work Day to day operations Network modifications solving critical site problems and Hardware Software upgradations For day to day technical help required by the site personnel centralised Control Rooms are set up at Delhi and Bangalore where the problems from site are registered analysed and solutions get arounds given on telephone
127. when we try to bring it INS after Diagnostic OK report has come How to handle memory units in various cases has been discussed below Memory units have links with both the BPs Each BIC amp BID card is provided with direct as well as cross port so as to enable each BP to have access with its own memory self port as well as the other memory cross port For example MU 1 has gone oos sys then following action is required to bring it INS ACT WORKSHOP ON C DOT DSS PRODUCTS 102 Case 1 Case 2 Case 3 Case 4 DIAGNOSTICS OF MEMORY UNIT Say BP 0 is INS ACT amp BP 1 is INS SBY Then diagnose MU 1 using DGN SWU command In case Diagnostics Report is Ok for MU 1 then give interchange command for BP to make BP 0 as INS SBY Diagnose MU 1 again In case DGN is ok with BP 0 also then bring the memory INS using PUT SWU INS command In case DGN is failing with one BP whichever is SBY then note down card id in case of 2MB cards Replace that card and repeat the diagnostics Go on replacing card as shown under DGN report till DGN comes ok in case of TME only one card replacement is required If DGN is failing despite changing all cards BID MEM then fault may be in BIC card of the SBY BP Replace BIC card also and repeat DGN It should pass now Repeat DGN with other BP and bring the mem INS ACT DGN of MU 1 is passing with both BPs when MU 1 is brought INS using PUT SWU INS command result fai
128. will be raised By giving displ alarm list find out the unit and by giving displ SWU status check the unit status if displ system all is showing any delay in updation Give soft start to system using init sys command if the delay is too much Do it in standby IOP in warm level and take the printout and del BC using Del Fgp File for the unwanted period Not properly jacked in or IPM is bad SPC card may be bad or TTC is INS amp TU is not through to TTC No You have to remove the subscriber from observation list and then delete Solved in 5 43 S W Some other switch unit is suspect at that time Moreover SBY BP must be there BC for previous year to be deleted every year Refer Annexure 13 It is implemented like this WORKSHOP ON C DOT DSS PRODUCTS 55 Chapter 7 SI 73 74 75 76 77 78 79 80 81 82 83 No QUESTIONS In Kangirappally MBM many subs request for conference facility can we provide that disconnected Call transfer facility is given to no eg 802000 The sub transfer the calls to 565777 a no with 90 sec pulse metering Another sub who dials 802000 will get 565777 in single metering even if he speak for 1 hr On taking traffic on junction between one SBM and MBM the success rate is shown only 15 But the junction are provided on digital trk via PCM and whenever we dial we get in the 1st instance and there is no congestion or fa
129. wn cnfg 4 1 lt F S gt 3 Insert CCM card in that slot 4 Select one O G type TGP say 10 and change its line signalling as RD Ring Down lt TGP gt TGP No 3 lt 1 gt Change ROD 0 in TGP 10 lt TGP gt TGP No 5 1 lt 1 gt 5 Add two RD ports to this TGP 10 lt TGP gt lt TGP No gt lt 1 gt lt F S T gt 6 Add one route NO say 10 to Direction 1 cnfg 3 1 lt 1 gt Maximum 10 routes can be added to Direction 1 7 Add TGP No 10 to route No 10 lt RUT gt lt Route No gt lt 1 gt lt TGP No gt 8 Add route code 100 197 198 to route no 10 lt RUT gt lt Route No gt lt 3 gt lt 1 lt 100 gt 9 Allow special service on subs Nos 10 Now connect telephones on the CCM ports which are allotted to the O G TGP 10 11 If any subscriber dials 100 ring will be extended on telephone connected to CCM ports and conversation will take place 12 Special Service No 100 can be defined as Emergency no by configuring corresponding Route No 10 by lt Rut gt lt 10 gt lt 7 gt 13 This way maximum 10 special service numbers can be opened in 256P RAX C DOT DSS FAMILY Annexure 2 Over Loading in Trunk Line BM Any BM in MBM exchange or SBM can go for over Loading due to various resasons Causes of Over loading and action required in such cases is stated below Cause 1 Actual Traffic Over load BHCA handling capacity of a BM with C
130. y to these nos 73 Metering on dialling by equipment no is not Metering is valid for PRD TAX routs only taking place even after version changed to 1_4 1 NM 38 C DOT DSS FAMILY PROBLEMS REPORTED DURING C DOT WORKSHOPS SL NO 75 PROBLEMS After the installation of MBM at Kollegal we are unable to receive the Billing data and process the same at o o GM Telecom If you change the S W program at centralised Billing for MBM it may not work for SBM BC backup of S W release 5 23 or 5 43 can not be processed at TRA Centre and details bill are not getting generated REMARKS The package used in billing centre to be modified Update SBM to 1 4 There is structure change in detail bill files required for processing So aquire new structure from C DOT to make the package compatible for P5 23 P5 43 also 7 1 4 System Initialisation Overload Related Problems SL NO PROBLEMS REMARKS 76 System going for frequent initialisation at level Refer Annexure 4 SBL CLR with reason Software Counter Over Flow 77 Message Buffer overload has been observed at Overload control strategy has been modified to some sites take care of overload problem in the new S W release 1_4 78 MLF report with reasons Data Comparison This is because of transient fault in some Error in R W Area memory card The C log utility can be run to identify which card is creating problem Howeve

WORKSHOP ON C-DOT DSS PRODUCTS

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