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C-DOT V5.X INTERFACE

1. Allocation lt Digit Signal digit Signal ACK Ringing Phase Inband ring back tone Ind Conversation Calling party On hook Signal on hook clears Release gt gt 46 C DOT 5 INTERFACE SOFTWARE ARCHITECTURE AN ORIGINATED CALL Called Party Clears first and Calling Clears before CSH Time out An Subs AN LE Nat PSTN Call Off hook Origination gt Establish Setup phase 1 gt Establish ACK lt Allocation lt Yn Un n s Un Allocation Complete anew eee ee m m an gt Inband Dial Tone lt Sig
2. uswa ukwa nayan gt Ringing Phase Ring lt Sa i a Signal stop ring Calling lt On hook party clears Ring stopped Signal ACK SS Se V sa gt Deallocation lt i i i un ih a i unan an a Deallocation Complete gt Disconnection lt man Disconnection Complete aaa gt 50 C DOT V5 X INTERFACE SOFTWARE ARCHITECTURE PSTN ORIGINATED CALL Called Party Clears An Subs AN LE Nat PSTN Seizure Allocation Call lt m m um M ma m nm nm m m Establish ACK H m gt Ring Ringing Phase lt Called party Off hook Signal off hook Answer answers gt gt gt Signal ACK lt ne
3. 2h 038 2005 Pee STVNDIS ONAS Pes LONL BONL OL C DOT V5 X INTERFACE 36 5 2 1 1 5 2 1 2 5 2 1 3 5 2 1 4 HARDWARE ARCHITECTURE OF V5 INTERFACE UNIT Processor Complex The SHM has been split into two identical halves called Processor Complex 0 and Processor Complex 1 Each Processor Complex handles four serial links of 64 kbps Each link provides one PHC terminal which can be configured either as C 85 or V5 Each processor complex contains a 68302 device This contains a 68000 processor The 68302 contains three serial links which can be programmed to HDLC protocol The serial link can work in PCM mode Since each processor complex handles four serial links one more slave 68302 device is used The processor within this 68302 is disabled The appropriate SYNC signals required for synchronizing all the serial PCM links are obtained from the Interface block of the card In addition to the RAM and ROM the arbitration logic for the shared memory also resides in the respective complex The shared memory access has been implemented by multiplexing the address and the data bus of the Processor Complex and the CPU using buffers The shared memory is available to both the SCC and the SHM cards with equal priority The address of the shared memory depends upon the id of SHM card Each SHM card has three id bits which are har
4. gt Inband Dial Tone lt i i ma sn amsa msn ma sn msn aysan Signal digit gt Signal ACK lt i wa akanan ws i i i Ringing Phase Inband ring back tone lt a un anan ah a am wn shan wa Answer lt aaa Conversation Hook Sw Flash Signal register recall gt gt Signal ACK lt CAAA AAA Aaa aaa ain kum Inband Transfer Dial Tone Signal digit a cc Sac gt Feature Setup Signal Ack Rest steps are same as AN originated call calling party clears USER MANUAL 49 Chapter 6 PSTN ORIGINATED CALL Calling Party Clears in Ringing An Subs AN LE Nat PSTN Seizure Allocation lt Establish ACK
5. 18 16 18 NE 7 T T T B 6 5 5 M H H H P u U U U 5 5 U U L U U 1 2 2 1 1 1 4 3 5 U U UJU s U G U 1 111 2 5 5 U U 1 2 FIG 4 1 MODULE WITH VU AND DTU DTU DTU ATU BPU TSU DESIGN ANINTRFC BMVUDTU 32 C DOT V5 X INTERFACE 4 2 4 3 SYSTEM ARCHITECTURE OF V5 INTERFACE UNIT V5 2 INTERFACE IN SBM C DOT SBM exchange can support maximum number of five V5 2 interfaces ten V5 1 interfaces with total number of 1 links cannot be more than 10 restriction on number of 1 links is because SBM require time slots for announcements and networking also Fig 4 1 shows the general SBM architecture supporting V5 X interface In SBM both VU and SU can be configured together in different frames This means it is possible to connect SBM to network on 7 signalling R2 signalling or decadic signalling Maximum of 3072 V5 subscribers are supported V5 2 INTERFACE IN MBM C DOT MAX L or MAX XL exchanges support maximum of seven V5 2 interfaces fourteen V5 1 interfaces per BM with total number of E1 links cannot be more than 14 The number is more than that for SBM because here one complete BM can dedicated to V5 subscriber and none of the l
6. Conversation Called party On hook clears Release gt phase Signal on hook CSH timer gt starts Signal ACK lt n n m n n Deallocation CSH lt Timeout occurred Deallocation Complete n gt Disconnection lt Disconnection Complete m nm gt USER MANUAL 51 Chapter 6 PSTN ORIGINATED CALL Caller ID Feature An Subs AN LE Nat PSTN Seizure Allocation lt lt Call Allocation Complete a gt Establish lt m m m
7. Un Establish Send Calling gt Party Address lt CLI Signal digit lt eee n nen n nan m m m Signal Ack en gt Signal Digit lt Signal Ack m gt Caller ID Addr Comp gt Ringing phase Rest of the steps are same as of PSTN originated call 52 C DOT V5 X INTERFACE 7 Operation and Maintenance INTRODUCTION For proper operation and maintenance of AN interface AN subscribers various MMI commands are available All subscriber line administration commands available for PSTN subscribers are valid for AN subscribers also Each AN subscriber is uniquely identified by its Directory Number and L3 address same as PSTN subscriber is identified by directory number and TEN TEN has no significance in case of AN subscri
8. 6 Chapter 7 Appendix A Appendix B Sotware 42 6 1 42 6 2 Functional 42 6 3 Messages And Their Flow In V5 Protocol eene enne 43 Operation Arid oso oorr 53 7 1 Description Of New Parameters L Lu 54 7 2 Al Interface Administration Commands 64 7 3 Subscriber Line Administration Commands 69 7 4 Additional Command For Maintenance And Performance Measurements 70 7 5 Procedure For Operating An Access Network Interface In 76 Stub Settings For Configuration Of TU As V5 Terminal Unit VU 79 In BPC Card For Acting As VPC Lu yu eR REP En HO 79 COBB ANY u eee 80 References E qua isa qhaya at az 82 Technical SpecitcatiOng t u u 83 F HOME AN WORD ANMXGEND DOC January 25 2000 1 Introduction 1 1 PURPOSE This document gives the
9. m m m m mm Disconnection Complete gt USER MANUAL 47 Chapter 6 AN ORIGINATED CALL Called Party Clear LLO Case An Subs AN LE Nat PSTN Call Off hook Origination gt Establish Set phase Seizure Ringing Phase Inband ring back tone Conversation Called party clears Inband ring parking tone PT After CSH time out Signal reduced battery After PT lt time out Calling party On hook Signal on hook clears Release gt 48 C DOT 5 INTERFACE SOFTWARE ARCHITECTURE AN ORIGINATED CALL Subscriber Hook Switch Flash An Subs AN LE Nat PSTN Set up phase Off hook gt Establish Suspasepasspssppaspssspppsspasusassssasasu gt Establish ea en i a Allocation lt i tn nk kk ah tn ss YU Allocation Complete SSS SSS SSS
10. USER MANUAL 19 Chapter 2 20 SUBSCRIBER V5 2 RU SUBSCRIBER Y e 4 L 34 Y PSTN ra SUBSCRIBER LE 5 gt E E Fd 2 WIRE Pd LOOP o SUBSCRIBER f Z 9 5 9 ________ WiLL AORA X 1 OPEN INTERFACE 5 I BS V5 2 e gt S N Y BS Y CN WiLL Ba s V _ BTS i ts BTS FIG 2 8 NETWORK SCENARIO TOTAL SOLUTION DESIGN ANINTRFC ANIGDNWS C DOT V5 X INTERFACE Chapter 3 C DOT Digital Switching System 3 1 INTRODUCTION C DOT Digital Switching System provides a total telecom solution to cater to the requirements of modern era communication network because of its modular and flexible nature It s technically comparable to existing Multinational Digital Switching Systems and has a distinctive advantage in the front of economies as per line cost of C DOT Digital Switching System is very less compared to per line cost of Multinational Digital Switching System This chapter gives the brief outline of C DOT Digital Switching System For more details refer to C DOT MAX GENERAL DESCRIPTION document 9 3 2 BAS
11. DESIGN ANINTRFC LEANCNV C DOT V5 X INTERFACE 2 3 V5 INTERFACE 011 Link Control Protocol It is used to manage multiple links of a V5 interface between AN and LE The main functionality of this protocol is blocking unblocking of links and link status report to higher layers viii BCC Bearer Channel Connection Protocol It provides the means for the LE and the AN to establish and release connections between specified AN user ports and specified V5 interface time slots It enables V5 interface bearer channels to be allocated or de allocated on a per call basis ix Protection Protocol It is meant for the protection of active C channels in case of failure of active link V5 INTERFACE As already discussed V5 interface provides connectivity between Local Exchange and Access Network as shown in Fig 2 1 Like ISDN and 7 signalling V5 interface is also a layered protocol It consists of three layers Layer 1 gt Physical Layer Layer 2 gt Data Link Layer gt LAPV5 Layer 3 gt Network Layer gt Call Control Interface maintenance At layer 1 standard physical layer protocol for 2Mbps digital link is used Layer 2 of V5 interface protocol is a subset of layer 2 of ISDN and is called LAPV5 Link Access Protocol for V5 interface protocol The LAPV5 protocol divides the layer 2 into two sublayers namely LAPV5 EF LAPV5 Envelope Function sublayer and LAPV5 DL LAPV5 Data Link sublayer All t
12. TYPE POSSIBLE VALUES DEFAULT REMARK 7 1 11 DEL AI PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK 7 1 12 DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK Channel Number CHNL NO This parameter is used for the creation of V5 1 subscribers Numeric 2 to 32 Except 16 Delete AN Interface DEL AI It denotes the AN interface s that shall be removed from traffic observation Numeric Same as the values possible for the parameter NUM sec 2 5 None Frame Type FRM TYP It is an existing parameter Alphanumeric A new value VU shall be added 58 C DOT V5 X INTERFACE 7 1 13 L3 STS PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK 7 1 14 OBS TYP PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK 7 1 15 PRI LNK PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK USER MANUAL OPERATION AND MAINTENANCE L3 Address Status L3 STS Identifies the status of L3 address for an AN Interface Alphanumeric FREE ASGN None Observation Type OBS TYP It denotes the entity which is under traffic observation This is an existing input parameter Alphanumeric new value shall be added for denoting an AN interface Primary Link PRI LNK Identifies the Primary link out of the links of
13. The NSC has an On Board Micro Processor to take care of PLL functions diagnostics communication with SSC The NSC card is duplicated and forms a security block with the CBX card Network Synchronisation Equipment NSE Network Synchronisation Equipment NSE is a standalone unit which is capable of receiving the network reference clock synchronising to the reference and supplying stable output clocks to a number of exchanges The input clocks are received from higher level nodes in the synchronisation network hierarchy Similarly the output clocks are supplied to lower level nodes The C DOT Network Synchronisation Equipment NSE consists of a PC type cabinet which houses duplicated controller card duplicated I O interface card and one each display card keyboard card and mother board The controller card has a software controlled digital Phase Locked Loop PLL microprocessor and related memory the non standard output clock interface display and keyboard interface The NSE I O card has the various types of input interfaces to take in the Network Clock It also extracts clock from input digital trunks It has the standard G 703 10 interface for the output clocks NSE gives out two duplicated 16 384 MHz clock for C DOT MBM and three duplicated 8 192 MHz and equal number of duplicated 8 KHz sync Signals for use in C DOT SBM exchanges The NSE connectivity with C DOT SBM MBM is explained as follows NSE Connectivity with C DOT SBM
14. Communication with the Administrative Module via the Central Module for administrative and maintenance functions and also for majority of inter BM switching i e call processing functions Provision of special circuits for call processing support e g tones announcements terminal tester MF DTMF controller etc Provision for local switching and metering in case of Remote Switch Unit application in standalone mode For these functions the Base Module hardware is spread over four types of units Terminal Unit for interfacing analog lines and trunks and providing special circuits like announcements amp Terminal tester Digital Terminal Unit for interfacing digital trunks Time Switch Unit for voice and message switching and provision of service circuits Base Processor Unit for control message communication and call processing functions Central Module Central Module is responsible for space switching of inter Base Module calls communication between Base Modules and the Administrative Module providing local clock and network synchronisation For these functions Central Module has a Space Switch Space Switch Controller and a Central Message Switch CM Provides connectivity to Base Modules Each BM interfaces with CM via two 512 channel parallel buses each operating at 4 Mbps These buses are called bus 0 and bus 1 and each bus carries voice information of 512 subscribers transmitted by the Base M
15. The duplicated Time Switch Controller TSC is the time base of a SBM exchange and it require an input of 8 192 MHz Digital trunks carrying timing information are trapped to NSE and synchronised output is fed to SBM TSCO is fed 8 192 MHz clock and 8 KHz synch Input from NSEO while receives similar input from NSE1 NSE Connectivity with C DOT MBM In the MBM exchange while the digital trunks carrying timing information are tapped in the same fashion as in SBM 16 MHz output of NSE is given to the duplicated Space Switch Clock SCK Card of the Central Module CM which is the master time base of the exchange SCK distributes timing to all the BMs C DOT V5 X INTERFACE C DOT DIGITAL SWITCHING SYSTEM 3 7 SOFTWARE ARCHITECTURE The software architecture of C DOT Digital Switching System is distributed in nature and has been designed to map onto the distributed control architecture of the system The switch hardware is surrounded by a number of software layers each of which presents higher levels of abstractions for the successive upper layer of software 8 7 1 Software Subsystems The main subsystems of C DOT Digital Switching system software are Figure 3 3 1 C DOT Real Time Operating System CDOS Peripheral Processors Subsystem Call Processing Subsystem Maintenance Subsystem 2 3 4 5 Administrative Subsystem 6 Data base Subsystem 7 Input Output Processor IOP Subsystem USER MANUAL 29 Chapter
16. Status can be restored by command PUT TRM INS 7 5 3 5 make terminals OOS PHC terminals of VU can be made OOS using PUT TRM OOS FRC TRM OOS with TML TYP PHC They can be brought inservice using PUT TRM INS FRC TRM INS 78 C DOT V5 X INTERFACE Appendix A STUB SETTINGS FOR CONFIGURATION OF TU AS V5 TERMINAL UNIT VU The processor id for VP 0 and VP 1 are and in Hexadecimal respectively These ids are assigned by bit settings done on stubs meant for it in backplane of motherboard of TU The bit stream for CC and CD are 1100 1100 and 1100 1101 respectively These are represented by making stubs open or short An open stub indicates 1 whereas short stub indicates 0 On the backplane of motherboard stubs marked W1 to W8 for HPCO W13 to W20 for HPC1 are present Stub settings for VU HPC1 ID Setting Bit HPCOID Setting Bit LSB W13 Open 1 W1 Short 0 W14 Short 0 W2 Short 0 W15 Open 1 W3 Open 1 W16 Open 1 WA Open 1 W17 Short 0 W5 Short 0 W18 Short 0 W6 Short 0 W19 Open 1 W7 Open 1 MSB W20 Open 1 W8 Open 1 LSB Least Significant Bit MSB Most Significant Bit 2 ECN IN BPC CARD FOR ACTING AS VPC Following capacitors in BPC Base Processor Controller card has to be removed to make it work as VPC V5 Processor Controller card C24 C111 and C182 For packaging and interconnection of VU refer to chapter 8 of C DOT CCS7 U
17. vi RESET SN vii RESET SN Message Flow Message flow between AN and LE is explained in sec 6 3 1 1 amp 6 3 1 2 with the help of examples Further message flows in different call scenario is given at the end of this chapter Call Initiated from LE On receiving a call request from the network for a particular AN port LE feeds call routing tone to calling subscriber and proceed to get a bearer channel for this call by sending an ALLOCATION message to AN and starts a timer After getting on ALLOCATION COMPLETE message from AN LE sends on ESTABLISH message to AN with cadenced ringing parameter to connect the ring to user port and starts a timer AN sends ESTABLISH ACK message and call enter into ringing phase C DOT V5 X INTERFACE 6 3 1 2 SOFTWARE ARCHITECTURE In case AN subscriber has caller id feature in which directory number of calling subscriber is to be sent to users equipment LE shall send ESTABLISH message to AN without cadenced ringing parameter LE shall send the digits either in signal message or in band in case subscriber has DTMF receiver and thereafter send a SIGNAL message with Cadenced Ringing to AN to connect ring to user port Call enters into conversation phase when answer is received from the AN subscriber answer should be communicated across V5 interface by sending SIGNAL Off Hook message to the other end Various subscriber features can be initiated by the subscriber by doing Hook Swit
18. Mbps digital link using V5 x or proprietary interface RSU is connected main exchange through proprietary interface RLC is connected to Main Switch or RSU through V5 2 interface MUX is connected to Exchange RLC through V5 1 interface The number of E1 2 Mbps links in all above depends upon the capacity of Remote switching equipment and traffic considerations APPLICATIONS WLL is an attractive alternative for rural telephony Use of V5 interface enhance the cost effectiveness of rural telecom network Similarly V5 interface has become an essential part of the FITL Fiber in the Loop solution where optical fiber is used as a transport medium The connectivity of the subscribers to the Access Network can thus be through any of the following e Subscriber MUX Landline Copper Wire e WLL Wireless in Local Loop e FITL Fiber in the Loop Subscriber MUX Figure 2 5 Subscriber MUX supports a maximum of 120 subscribers connected to it through copper wires To connect 120 subscribers four V5 1 interfaces will be required as one V5 1 caters to 30 subscribers only Wireless in Local Loop Figure 2 6 Here Access Network comprises Base Station Controller BSC and Base Station BS BSC is connected to Local Exchange through V5 2 interface having four E1 links In the present configuration each BSC can have upto 20 Base Stations and can support upto 1000 wireless subscribers with traffic capacity of 1 erlang at 1 GOS The figure shows DE
19. Modify AI Characteristics New Command Description This command shall be used to modify the characteristics of an AN Interface must be put OOS for execution of this command Input Parameters AI NUM VAR ID Displays existing value PRI LNK Display the existing value USER MANUAL 67 Chapter 7 SEC LNK Display existing value PROT INF Display existing value Output Form Following is the output report displayed after successful execution of command MODIFY ACCESS NETWORK INTERFACE REPORT AN Interface Number AN Interface Name AN Interface Type Varient id Primary Link Secondary Link Protocol information 1 2 1 DISPL L3 ADDR Display L3 Addresses New Command Description This command is used to display the list of 13 addresses with given status for an AN interface Input Parameters AI NUM ALL ENTITIES AI NAME ALL ENTITIES AI TYP i ALL L3 STS Only one of AI NUM AI NAME is to be given Output Form Following is the output report displayed after successful execution of command DISPLAY FREE L3 ADDRESS REPORT FOR V5 2 AI AN Interface Number AN Interface Name BM Number Start L3 Address L3 Addresses DISPLAY L3 ADDRESS REPORT FOR V5 1 AI AN Interface Number 68 C DOT V5 X INTERFACE AN Interface Name BM Number Status L3 Address L3 Addresses AI channel Number OPERATION AND MAINTENANCE Similarly reports for V5 1 amp V5
20. TUI TUC path So the basic function of TUC card in VU is to pass signalling message from time switch to PHC terminals It interacts with PHC card on one side and with TUI on other side The connectivity of PHC terminal configured as C 85 terminal to BP is also through TUC card C DOT V5 X INTERFACE 5 2 5 5 2 6 5 2 7 5 3 HARDWARE ARCHITECTURE OF V5 INTERFACE UNIT All PHC cards in VU together can use maximum of 32 TS One per PHC terminals of 128 TS PCM stream available on TUC towards time switch So remaining 96 time slots which are not utilised by VU can be used by another TU equipped in concentration with the VU frame Terminal Unit Interface TUD Card The terminal unit interface card TUI primarily acts as an interface between TUC and Time Switch Interface TSI card of TSU It also interfaces with other TUIs in the concentration mode In order to cater to both the copies of TUCs the TUI is also duplicated The basic function of TUI is the conversion of TTL type signal to ECL type and vice versa Base Memory Extender BME Card This card is used to provide increased memory of 16 MBs for the processors used in different modules like BPU APU SCU amp 7 SU and VU The card has been implemented by using 4 modules of 4MB each The card has on board interface logic to support hot standby redundancy and cross bus addressing capability Power Supply VU is equipped with duplicated power supply card PSU II in
21. currently faulty Keys are provides for manual acknowledgment initiating self test and selective audio disable enable SIGNALLING SYSTEM NO 7 SS7 capability in C DOT exchanges is implemented in a separate unit called SS7 Signalling Unit 750 The 7SU hardware is packaged into a standard frame The equipage of the frame is similar to that of a terminal unit In a Base Module rack the 7SU frame can be placed in any TU frame position i e principal frame or concentration frame position In case it is equipped in the principal frame position it interfaces with the Time Switch via a 128 channel PCM link operating at 8 Mbps Thus from an architecture point of view the placement of 7SU in a BM is similar to that of a TU and it communicates with the outside world via the Terminal Unit Controller TUC This is a depicted in Fig 3 2 Similar to a TU 7SU has SS7 terminal cards i e Protocol Handler Cards PHCs Each PHC supports upto 8 signalling terminals in the present implementation PHC is also know as SHM Signalling Handler Module card USER MANUAL 95 Chapter 3 3 6 3 6 1 26 The PHC terminals can be configured as SS7 terminals or C 85 C DOT proprietary protocol a variation of X 25 protocol terminals for internal control message communication One PHC terminal is configured as C 85 terminal at the time of 7SU initialisation in order to enable code and data downloading from the Input Output Module The communication
22. displayed after successful execution of the command DISPLAY ACCESS NETWORK INTERFACE CHARACTERISTICS REPORT AN Interface Number AN Interface Name AN Interface Type Varient id AN Interface Category Start L3 Address Number of Subscribers An Interface Links Primary Link Secondary Link Protocol Information 7 2 4 ADD AI LNK Add AI Links New Command Description This command is used to add or more E1 links to an existing AN interface This command doesn t hold for V5 1 interface Input Parameters AI NUM 5 AI NAME NONE AI LNK 66 C DOT V5 X INTERFACE OPERATION AND MAINTENANCE Output Form Following is the output report displayed after successful execution of command ADD ACCESS NETWORK INTERFACE LINKS REPORT AN Interface Number AN Interface Name AN Interface Links Added AN Interface Links not Added DEL AI LNK Delete AI Links New Command Description This command is used to delete links from a particular AN interface Primary or Secondary links cannot be deleted using this command This command doesn t held for V5 1 interface Input Parameters AI NUM None AI NAME AI LLNK Only one of AI NUM and is to be given Output Form Following is the output report displayed after successful execution of command DELETE ACCESS NETWORK INTERFACE LINK REPORT AN Interface Number AN Interface Name AN Interface Logical Links MOD AI CHAR
23. the AN interface s is given under this parameter which is to be put under traffic observation 7 1 2 AI CTG PARAMETER NAME AN Interface Category MNEMONIC AI CTG DEFINITION Identifies the category of the AN subscribers TYPE Numeric POSSIBLE VALUES 1 to 64 DEFAULT 1 REMARK None 54 C DOT V5 X INTERFACE OPERATION AND MAINTENANCE 7 1 8 AI LLNK PARAMETER NAME AN Interface Logical Link MNEMONIC AI LLNK DEFINITION Identifies an AN interface link uniquely for the AN interface It is same as the logical link id in the AI LNK parameter It ha fixed value 0 for V5 1 interface TYPE Numeric POSSIBLE VALUES 0 to 13 for V5 2 interface only DEFAULT Essential Parameter REMARK 7 1 4 AI LNK PARAMETER NAME AN Interface Link MNEMONIC AI LNK DEFINITION Identifies the links for a particular AN interface It consists of following five parts BM RACK FRAME SLOT LOG_LINK_ID First four fields identify the physical location of the link and the fifth field identifies the link uniquely within the AN interface TYPE Numeric fields POSSIBLE VALUES BM 1 to 32 RACK 1to3 FRAME 1106 SLOT 1 to 26 LOG_LINK_ID Same as the values possible for the parameter AI LLNK sec 7 1 8 DEFAULT Essential Parameter REMARK USER MANUAL 55 Chapter 7 7 1 5 AI NAME PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK 7 1 6 AI NUM PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT R
24. the appropriate protocol messages The SHM supports two protocols i e C 85 and V5 interface protocol For V5 interface protocol the SHM scans the layer 1 and layer 2 whereas for the C 85 protocol the SHM scans the link level and level functions The SHM interfaces with two duplicated CPU cards through the processor bus running on the backplane It also interfaces with two duplicated terminal unit controller cards TUC through PCM link Functionally SHM card can be divided into four blocks Fig 5 2 i Processor Complex 11 CPU Interface 11 Interface iv block C DOT V5 X INTERFACE HARDWARE ARCHITECTURE OF V5 INTERFACE UNIT 12 34 5 6 7 8 9 1011 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 ps e es 8 5 5 U UM 5 6 u U EM MMM C L E luf fu 1 2 1 2 1 1 1 1 4 3 FIG 5 1 VU CONFIGURATION DESIGN ANINTRFC VUCNF USER MANUAL 35 Chapter 5 INHSQSYOJ3H LNINVANOIS3QN WHS dO INVHOVIG 20 18 Old 099 008 55 _ AHOWSIA STVNDIS ONAS Y 008 ena 32018 gt 1995 0995 OL 225 STVNDIS WOd
25. 2 AI assigned L3 address will be displayed 7 3 SUBSCRIBER LINE ADMINISTRATION COMMANDS For exchange there is no difference between AN subscribers and PSTN subscribers Hence all the subscriber line administration commands are valid for AN subscriber also All such available commands are described in detail in 11 All AN subscribers are uniquely identified by its DIRNO and AISUB ID Most of the subscriber line administration commands for AN subscriber are executed by DIRNO of the subscriber 7 3 1 CRE SUB Creation of AN PSTN Subscribers Modified Command Description This command is used to configure on AN PSTN subscriber Input Parameters DIR NO TEN AISUB ID CHNL NO LIN TYP INS TYP SUB PRI CAL MOD FAC ORG FAC TRM MTR CLS DET BLG ACC BAR LIN CAT CAB ID OPR ACC SUB CTG Output Form NONE NONE NONE ORD LIN DECAD 1 NO INT NO ORG NO TRM NRM MTR ORD BLG OG UPTO LCL 1 1 1 1 YES 1 Output report displayed after successful execution of command USER MANUAL 69 Chapter 7 7 4 70 CREATE SUBSCRIBER REPORT Directory Number Terminal Equipment Number AN Subscriber Id AI Channel Number Line Type Instrument Type Priority Call Mode Facility Origination Facility Terminating Metering Class Detailed Billing Cable Id Line Category Operator Accessibility Access Barring Local Counter STD Counter STD Calls ISD COUNTER ISD
26. 3 VSTGDSINW OSYLNINV NDISAC AYVMLAOS Q3H3JAV T SSA 109 0 913 JHL LdVd V SI AYVMLAOS td31qNVH IWNIWYAL SWALSASENS SYVMLAOS NOILVYLSININGY ANY ONISSSOOUd TIVO SLSISNOO 5 NOILYONddY N 5 NOILVOlTddV A 7 x 7 x YADVNVW ASVEVLVG p X p d z 2 3 X N Z N N lt N 7j D 4 lt x 4 A A N F 2 N e N lt Z amp S 5 N X f X 2 b Wy Pi S amp X Ww a N N S V gt lt V p N 2 N 4 4 z Y V j if Z C DOT V5 X INTERFACE 30 Chapter 4 System Architecture of V5 Interface Unit 41 INTRODUCTION V5 x capability in C DOT DSS exchanges is implemented by using a new hardware unit called VU V5 interface unit Fig 4 1 The VU hardware is packaged into a standard Terminal equipment frame TU In a Base Module rack the VU frame can be placed in any TU frame position i e principal frame or concentration frame position In case it is equipped in the principal frame position it interfaces with the Time Swi
27. 7 2 9 Interface 9 2 4 Comparision Between The V5 1 Interface And The V5 2 Interface 13 Deb Interface eO be iN v Ie o En Un 13 2 0 Applica tio 15 2 7 Advantages Of Interface 18 C DOT Digital Switching 21 S qe ee m 21 3 2 Basic Modules Of C DOT Digital Switching 21 9 8 Remote Switch Unity uu Gas u pen eo EX EIE A 25 9 4 Alarm Display Panel iiec ipei tert EP ERA VENE 25 1 5 System ioc iE jee N 25 2 6 Network Synchronisation o QE ned 26 3 Architlectupe cette 29 System Architecture Of V5 Interface 31 4 1 Introductio EE 31 42 V5 2 Interface In SBM uu t ie aa em 33 4 3 V5 2 Interface In 33 Hardware Architecture Of V5 Interface 4 34 5 1 Introd uti ont 34 5 2 Hardware Architecture Of VU aiite ERR 34 5 3 Interconnections Of Vi cectecesssseaseevehtoveunsiedvonssenonisssatnernctoacniansssdccesossbaptestanvesitsSipaeccersens 39
28. 8 MAILED UP V5 INTERFACE LINK IOP NAILED UP C 85 INTERNAL MESSAGE LINKS FIG 5 4 VU PATH WITH OTHER UNITS DESIGN ANINTRFC BMCM USER MANUAL 41 6 1 6 2 6 2 1 6 2 2 42 Chapter 6 Software Architecture INTRODUCTION Software for supporting V5 interface in MAX is distributed over IOP AP BP and VU All existing software in and IOP has been modified to cater to 5 subscribers also VU software consist of layer 2 and layer 3 functions These functions are distributed over SHM and CPU cards of VU Software of layer 2 resides in the SHM card whereas layer 3 function software distributed over CPU card and Base Processor FUNCTIONAL ARCHITECTURE The V5 Interface Software architecture has been divided into the following subsystems e Administration sub system Call processing sub system e Maintenance sub system Administration Sub System The processes of this sub system are responsible for AN interface data updation traffic observations of AN interface and billing of AN subscribers Administration subsystem is responsible for maintaining a large number of traffic records on the basis of the information received by it through Call Event Records and a large number of traffic related commands Billing processes provide billing records for AN subscribers Call Processing Sub system Call processing sub system is involved in establishment of V5 calls checking line sta
29. AN interface The logical link number is used to identify the AN interface link Numeric Same as for the parameter AI LLNK sec 7 1 2 Essential Parameter 59 Chapter 7 7 1 16 Protocol Information MNEMONIC PROT INF DEFINITION Holds information regarding peculiarities of the Access Network such as i Caller id type be given as tone or as a signal message ii Backward signalling Access dependent or Access independent 11 Port Alignment Accelerated or not iv Link Control Protocol Enabled or disabled v Initialisation of Protocols Parallel or Serial vi Switchover to Secondary Sequential or not TYPE Alphanumeric POSSIBLE VALUES NONE BACK_SIG_ACC_DEP CALL_ID_MSG ACCL_PORT_ALIGN LINK_CTRL_DISABLED PARALLEL_INIT SEQ SWITCHOVER DEFAULT None REMARK 7 1 17 RPT ID PARAMETER NAME Report Identification MNEMONIC RPT ID DEFINITION It denotes the type of traffic report that is to be displayed This is an existing input parameter TYPE Alphanumeric POSSIBLE VALUES New values V5 1 REP and V5 2 REP shall be added for denoting V5 1 an V5 2 AN interface reports DEFAULT REMARK 60 C DOT V5 X INTERFACE 7 1 18 DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK 7 1 19 SEC LNK PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK OPERATION AND MAI
30. C DOT V5 X INTERFACE USER MANUAL System Section No 405 027 0722 Draft 02 January 2000 Practices C DOT 5 INTERFACE USER MANUAL 2000 C DOT Printed in India CDOT V5X INTERFACE USER MANUAL DRAFT 02 JANUARY 2000 MAGHA 2056 SERIES 000 OVERVIEW CSP SECTION NO 405 027 0722 THIS C DOT SYSTEM PRACTICE REFERS TO THE C DOT INTERFACE ABBREVIATEDAS C DOT V5 X IN THE REST OF THIS PUBLICATION THE INFORMATION IN THIS SYSTEM PRACTICE IS FOR INFORMATION PURPOSES AND IS SUBJ ECT TO CHANGE WITHOUT NOTICE A COMMENT FORM HAS BEEN INCLUDED AT THE END OF THIS PUBLICATION FOR READER S COMMENTS IF THE FORM HAS BEEN USED COMMENTS MAY BE ADDRESSED TO THE DIRECTOR SYSTEMS CENTRE FOR DEVELOPMENT OF TELEMATICS 39 PUSA ROAD NEW DELHI 110 005 2000 BY C DOT NEWDELH Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Table of Contents Tet Od CHO 5 I T ERE 1 2 air E 5 1 3 Need For V5 Interface i ei ir I 5 1 4 Organisation Of The Document 6 MDULBDGRIJOB EI oU D SEDI tree ere 7 OM 7 22 au u qaa
31. CALLS ADDITIONAL COMMAND FOR MAINTENANCE AND PERFORMANCE MEASUREMENTS All the commands used for the maintenance of terminals in MAX e g PUT TRM OOS DISPL TRM ALL etc can be used for AN subscribers AI channels and PHC terminals So three more values are used in TML TYP namely ANSUB AICHNL and The AlI links can be maintained by the commands used DTKs in the So all the commands used for DTKs are valid for AI links also However few new commands are added for maintenance purpose which are as follows C DOT V5 X INTERFACE OPERATION AND MAINTENANCE 7 4 1 DISPL AICNT OOS New Command Description This command is used to display the count of faulty AN subscribers or AI channels in a particular AN interface Input Parameters AI NUM AI NAME None TML TYP STAT TRM Output Form i When STAT TEN ALL given TML TYP ANSUB ALL STATUS ACCESS NETWORK SUBSCRIBER COUNT REPORT AI NUM AI NAME AI TYP OOS_OPR INS INS_ANBLK INS_LLO 1 When STAT TRM ALL amp TML TYP AICHNL given ALL STATUS ACCESS NETWORK INTERFACE CHANNEL COUNT REPORT AI NUM AI NAME AI TYP OOS_SE OOS_OPR OOS EXT OOS_SO OOS_TRANS INS INS_ANBLK When STAT TRM value is not TERMINAL COUNT REPORT ACCESS NETWORK INTERFACE AI NUM AI NAME STATUS TML TYP COUNT USER MANUAL 71 Chapter 7 7 4 2 DISPL LSCNT OOS Modified Command Description This command is used
32. CT as Access Technology DECT technology uses frequency band of 1880 1990 MHz with ten carriers each having spacing of 1 728 MHz USER MANUAL 15 Chapter 2 16 N COPPER WIRE SUBSCRIBER MUX 1 1 120 i N 2 SUBSCRIBER AN SUBSCRIBER MUX V5 1 V5 1 gt V5 1 ra gt V5 1 ra gt FIG 2 5 LE DESIGN ANINTRFC LLCWR C DOT V5 X INTERFACE V5 INTERFACE LE N 7 BABS ine u 1 me it 1 1 1 BSC E1 m V I V5 2 INTERFACE 20 7 1000 4BS WIRELESS SUBSCRIBER FIG 2 6 WIRELESS IN LOCAL LOOP DESIGN ANINTRFC WLLP USER MANUAL 17 Chapter 2 2 6 3 Fiber in the Loop Figure 2 7 Here Access Network comprises Host Digital Terminal HDT and Optical Network Unit ONU HDT is connected to Local Exchange through a bundle of 32 E1 links of V5 2 interface s HDT can have maximum of four optical networks with each having maximum of 32 ONUs In each optical network maximum 1024 B channels can be provided Hence HDT can support maximum of 4096 1024 x 4 B Channels ONUs are connected to HDT through high capacity optical fiber cables 2 7 ADVANTAGES OF V5 INTERFACE 1 Compatibility V5 interface has been recognised Internationally as standard protocol between Local Exchange and Access Network In future it should be possible to connect Local Exch
33. EMARK AN Interface Name AI NAME It uniquely identifies an AN interface in MAX Alphanumeric At most 10 characters long name It can have alphanumerals including hyphens but cannot start or end with hyphen None AN Interface Number AI NUM It uniquely identifies an AN interface in MAX Numeric 1 to 100 None 56 C DOT V5 X INTERFACE 7 1 7 AISUB ID PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK 7 1 8 DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK 7 1 9 CARD SLT PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK OPERATION AND MAINTENANCE AN Subscriber Identification AISUB ID Identifies an AN subscriber uniquely It consists of two parts NUM L3_addr Numeric AI NUM Same the values possible for the parameter AI NUM i e 1 to 100 L3 addr Same as the values possible for parameter ST L3ADR sec 2 21 L3 addr should be in the range of ST L3ADR to ST L3ADR plus 3072 For ST LIADDR refer 7 1 21 None AN Interface Type AI TYP Identifies the type of AN interface to be created Alphanumeric V5 1 or V5 2 None None Card Slot CARD SLT It is an existing parameter It identifies the physical slot of terminal card Numeric Existing None USER MANUAL 57 Chapter 7 7 1 10 CHNL NO PARAMETER NAME MNEMONIC DEFINITION
34. IC MODULES OF C DOT DIGITAL SWITCHING SYSTEM C DOT Digital Switching System is designed using T S T switching matrix C DOT DSS exchanges can be configured from four basic modules Figure 3 1 a Base Module b Central Module c Administrative Module d Input Output Module 3 2 1 Base Module Base Module is the basic growth unit of C DOT DSS It interfaces the subscribers trunks and special circuits The subscribers may be individual on PBX lines or lines and the trunks may be Two Way E amp M Four wire or digital The basic functions of a Base Module are Analog to digital conversion of all signals on analog lines and trunks Interfacing digital trunks Switching calls between terminals connected to the same Base Module USER MANUAL 21 Chapter 8 WV WO 1 ASIA WOI dav 550 LOG 9 dO INVHOVIG 201 Was IN8S LINN HOLIMS SLOWS AWVYs 151 NIVIN TANVd AV 1dSIQ LAdLNO FINGOW SAILVYLSININGY JINON WHYLNAD JINON asva Snsd OL SANNHL DOWNY NSH WOI WO Wa SANM 2 C DOT V5 X INTERFACE 22 3 2 2 3 2 3 C DOT DIGITAL SWITCHING SYSTEM
35. NTENANCE Report Type RPT TYP It denotes the type of traffic report that is to be generated This is an existing input parameter Alphanumeric A new value of AI REP shall be added for denoting an AN interface report None Secondary Link SEC LNK Identifies the Secondary link out of the links of AN interface The logical link number is used to identify the AN interface link Numeric Same as for the parameter AI LLNK sec 7 1 2 INVALID USER MANUAL 61 Chapter 7 7 1 20 STAT TRM PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK 7 1 21 STAT SWU PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK 7 1 22 ST L3ADR PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK Status of Terminal STAT TRM It is an existing parameter It identifies the status of terminal Alphanumeric New values INS ANBLK and INSF ANBLK will be added INS ANBLK will be applicable to both AN subscribers and AI channels while INSF ANBLK will be applicable to only AI channels ALL Status of Switch Unit STAT SWU It is an existing parameter It identifies the status of a switch unit Alphanumeric New value OOS INI will be added to indicate VU CPU status during initialisation ALL Start L3 Address ST L3ADDR Identifies the start L3 address of the range of L3 addresses valid for an AN interface Numeric 0 to 32767 Essen
36. OTE CAN VARY FROM 1 TO 16 9 508 D lt BEARER CHANNELS N L lt ISDN D CHANNEL INFORMATION p is lt PSTN SIGNALLING INFORMATION M P lt CONTROL INFORMATION gt LE I lt LINK CONTROL INFORMATION gt s 7 MN lt PROTECTION INFORMATION p M L lt BEARER CHANNEL CONNECTION p lt TIMING INFORMATION gt S L FIG 2 3 V5 2 INTERFACE DESIGN ANINTRFC ANIGDV2 12 C DOT V5 X INTERFACE Layer 3 of V5 2 interface consists of five protocols PSTN protocol BCC protocol Control protocol Link control protocol Protection protocol V5 INTERFACE 2 4 COMPARISION BETWEEN THE V5 1 INTERFACE AND THE V5 2 INTERFACE 5 5 Protocol subscriber Protection of C channel Not present as it has only one 1 link _ Standard complete International Extension of V5 1 interface Standard protocol E1 links single 1 link Supports upto 16 E1 links Bearer channel allocation Nailed up channel for each Channel allocation on call by call basis through BCC protocol Can be protected if the protocol has more than one 1 link and secondary is configured Link control protocol Not present as it has only one link 2 5 V5 INTERFACE IN REMOTING The subscribers may spread over large distances within a local exchange area requiring longer loops and hence large investment in copper cable Further to
37. S 7 trunks 512 3 Incoming Outgoing amp bothway 64 2048 12 digits max 0 to 127 1 to 14 83 TECHNICAL SPECIFICATIONS 15 No of maximum trunk groups 7 for alternate routing on a route 16 Possible types of days 8 17 No of periods on type of day 8 18 Subscriber Services a Basic Services b Rapid Call set up Services c Call Booking Services d Call Restriction Services e Absent Subscriber Services f Call Completion Services g Call Charge Services h Multiparty Services i Administrative Service p Miscellaneous Services 19 V5 x interface V5 1 interface b V5 2 interface 20 No of AN subscriber per BM 3072 21 No of V5 interface Max five V5 2 interface Max ten V5 1 interface SBM Max seven V5 2 interface Max fourteen V5 1 interface MBM 22 No of E1 link 10 SBM amp 14 MBM 84 C DOT V5 X INTERFACE System Practices COMMENTS C DOT The following comments pertain to Document Name CSP Section L L IL dL d E JEJE ILI Issue Draft Month Year COMMENTS Use a separate sheet if required Please mail your comments to Your Reference Centre for Development of Telematics Name Attn Mr Pandey Director Systems Company Address 39 Main Pusa Road New Delhi 110 005 Tel 91 11 5740374 Fax 91 11 5756378
38. ange of one vendor to Access Network of another vendor without any changes 2 Cost Optimization Removal reduction in subscriber cables as Local Exchange and Access Networks are connected to each other by 2 Mbps E1 digital links 9 Effective Network Planning Sparsely populated villages distributed over large areas or congested metros can be connected using wireless in local loop based on V5 interface Figure 2 8 shows the total network solution using V5 interface 4 Simplified Operation amp Maintenance Subscriber connected to Access Network are controlled from Local Exchange using V5 interface Billing and other operations are done at Local Exchange D Reduced delays amp hardship By using V5 interface activities like digging the road and laying down the subscriber cables will be reduced drastically which in term reduce the delay in giving subscriber connection 6 No effect from human amp natural calamities 18 C DOT V5 X INTERFACE V5 INTERFACE 32 E1 LINES S LE YY Y vv vv 102478 5 HDT OFC E ros E 102478 5 FIG 2 7 FIBER IN THE LOOP OPTICAL POTS ONU N SDN BRA OFC 1 ISDN PRA OFC OFC x 2 NOFC N 32 ONU 1024 77 CHANNELS OFC 1024 B CHANNELS DESIGN ANINTRFC FBRLP
39. bers as there is no physical termination of subscriber line in the exchange instead there exists an unique layer 3 address in the exchange L3 address corresponding to each subscriber Thus all the subscriber line administration command can be executed by the directory number of the subscriber unlike to the case of PSTN subscribers where each subscriber line administration command can be executed with either directory number or TEN Section 7 1 describes the parameters used in different Operation and Maintenance command Section 7 2 describes the MMI commands available for the administration of AN interface Section 7 3 describes the subscriber line administration commands Section 7 4 describes additional modified commands for maintenance performance measurement 7 5 describes procedure for creation and maintenance of AN interface and subscribers in MAX USER MANUAL 53 Chapter 7 7 1 DESCRIPTION OF NEW PARAMETERS This section gives details of new and existing only changed ones parameters used in different commands required for administration maintenance and performance of AN interface on C DOT Digital Switching System For each parameter definition and the values it can take have been given ADD AI PARAMETER NAME Add AN Interface MNEMONIC ADD AI DEFINITION It denotes the AN interface s that shall be put under traffic observation TYPE Numeric POSSIBLE VALUES 1 to 100 DEFAULT None REMARK The AI NUM of
40. ch Flash when the call is in the conversation phase If the release of the call is initiated from LE parking tone should be fed to AN subscriber parking tone timer shall be run at LE and disconnection from AN subscriber be awaited AN subscriber disconnects before the expiry of parking tone timer this indication comes in the form of SIGNAL On Hook message across V5 interface Call clearing is started by sending DEALLOCATION message and on getting DEALLOCATION COMPLETE PSTN protocol is cleared by DISCONNECTION DISCONNECTION COMPLETE message Call Initiated from AN AN on detecting an origination from user port should send ESTABLISH message to LE LE shall send ESTABLISH ACK message in response gets a bearer channel by ALLOCATION ALLOCATION COMPLETE and connect dial tone to the channel When answer is received from PSTN subscriber call will enter into conversation phase For AN originated calls from subscribers with home metering facility metering pulses shall be reported to AN in the form of SIGNAL Meter Pulse message over the V5 interface Call clearing procedure is same as described in 6 3 1 1 USER MANUAL 45 Chapter 6 DIFFERENT CALL SCENARIOS AN ORIGINATED CALL Calling Party Clears An Subs AN LE Nat PSTN Call Off hook Origination gt Establish Setup phase s q d gt Establish ACK lt a amn a ma m ma ma a en
41. d programmed and depends upon its slot in the VU CPU Interface SHM card communicates with the CPU card through CPU interface also called SCC interface This interface buffers all the signals from both the copies of CPU It is also responsible for the selection of the active CPU from the two copies TUC Interface SHM card communicates with TUC via this interface This interface buffers all the signals from the TUCs It also have SYNC generation logic which generates sync signals The sync signals are used by processor complexes for identification of slots in PCM link This interface multiplexes all the transmit signal emerging from the processor complexes into a single PCM stream ACIA Block The ACIA Block is used while testing the SHM card Since each Processor Complex is independent two separate ACIA links are required to communicate with both of the complexes In addition one more link has been provided for debugging software In each processor complex ACIA link is provided in the slave 68302 The Processor Complex 0 has one extra ACIA link for software debugging purposes USER MANUAL B Chapter 5 5 2 2 5 2 3 5 2 4 38 CUL Card The CSU load card CUL can be used in VU as a dummy card This card is to be inserted in the slot where no SHM cards are jacked in i e on the copy 1 side Two CUL cards are required per VU The CUL card is used to consume the minimum amount of current so that the power su
42. e CCK Central Clock Cards It receives the 2 048 MHz reference input clock from DTS and converts it into 16 884 MHz clock It generates a sync signal 8KHz and feeds it to the CCKs It generates the real time clock for the system using Time of Day block C DOT V5 X INTERFACE C DOT DIGITAL SWITCHING SYSTEM TIME SWITCH TIME SWITCH SEP X 557 DIGITAL SPACE DIGITAL TRUNKS DTU SWITCH 1 8 DTU TRUNKS TU H TU f ANALOG LINES amp j TRUNKS ANALOG TU Beg TU LINES amp id X TRUNKS N X E T 750 TU NI zo BP BMS Hi BMS BP 2 CMS LEGEND 750 557 SIGNALLING UNIT ADMINISTRATIVE MODULE ADMINISTRATIVE PROCESSOR DOWNLOADING PATH BM BASE MODULE a a NAILED UP 7 SIGNALLING LINKS BMS BASE MESSAGE SWITCH NAILED UP INTERNAL MESSAGE LINKS BASE PROCESSOR CM CENTRAL MODULE CMS CENTRAL MESSAGE SWITCH DTU DIGITAL TERMINAL UNIT IOM INPUT OUTPUT MODULE INPUT OUTPUT PROCESSOR SCIC SERVICE CIRCUITS INTERFACE CONTROLLER TERMINAL INTERFACE CONTROLLER TU TERMINAL UNIT TUC TERMINAL UNIT CONTROLLER DESIGN ANINTRFC ANIGDSSU USER MANUAL 27 Chapter 3 3 6 2 28
43. e used for synchronisation and to carry signalling information Layer 3 of V5 1 interface consists of two protocols PSTN protocol Control protocol Signalling informations are multiplexed at layer 3 and carried over a single layer 2 data link 2 3 2 V5 2 interface Figure 2 3 V5 2 interface consists of multiple 2 048 Mbps E1 links bundled together A single V5 2 interface can consist of a maximum of sixteen 2 048 Mbps links In the bundle one E1 link is defined as Primary link amp another as secondary Signalling information for all the subscribers is carried in time slot 16 of primary or secondary link whichever is active On demand TS 15 and TS 31 can also be used for signalling the remaining time slots except time slot which is used as FAS of the V5 2 interface are used as bearer channels V5 2 interface supports concentration i e time slots are allocated on call by call basis to the subscribers 10 C DOT V5 X INTERFACE V5 INTERFACE 2 048 Mbps LINK E1 AN V5 1 INTERFACE lt BEARER CHANNELS J E ISDN CHANNEL INFORMATION all AN p PSTN SIGNALLING INFORMATION N A lt CONTROL N K TIMING N FIG 2 2 V5 1 INTERFACE LE LE DESIGN ANINTRFC ANIGDV1 USER MANUAL 11 Chapter 2 V5 2 INTERFACE BUNDLE 2 048 Mbps LINK1 2 048 Mbps LINK2 AN LE 2 048 Mbps n V5 2 INTERFACE gt N
44. each plane So in all 4 PSU II cards are available on VU two in each plane in active hot standby made The input voltage vary between 44V and 56V and it provides on its output 5V 12V 12V and 9V unregulated The card uses SMPs technique to provide all these voltages at output INTERCONNECTIONS OF VU VU is hardwavewise equivalent to a terminal unit TU Interconnections of VU with other TUs in a BM is shown in Fig 5 3 and position of VU in MBM configuration is shown in Fig 5 4 USER MANUAL 39 Chapter 5 40 DTKs FROM AN BACK PLANE BUS VUCPU TSU TO BP 32 TS PCM TGs PCM 128 TS DTS DTC TUC 32 TS PCM TGs PHC VTUC PCM 128 TS FIG 5 3 INTER CONNECTION OF VU DESIGN ANINTRFC VUINBM C DOT V5 X INTERFACE HARDWARE ARCHITECTURE OF V5 INTERFACE UNIT CM BM V5 2 INTERFACE T SPACE WITH 1 LINKS ly SWITCH SWITCH TOWARDS ACCESS NETWORK E 30 ANALOG LINKS TU VU EP 5 A lt lt lt lt lt 4 CMS A CODE DATA DOWNLOAD PATH
45. etween Local Exchange and Access Network over V5 interface Fig 2 1 This chapter gives brief insight on standard V5 interface protocol DEFINITIONS 1 ii iii 0 vi Access Network AN A system implemented between the Local Exchange LE and user replacing part or the whole of the local line distribution network Local Exchange LE An exchange on which user lines are terminated directly or via an AN V5 Interface A general term for the family of V Interfaces for connections of ANs to the LE e g V5 1 or V5 2 interface See 2 3 1 and 2 3 2 for description Layer 3 Address L3 addr It is an address given to individual subscriber of Access Network It is included in layer 3 messages to identify the AN subscriber for which the message is meant PSTN Protocol It is concerned with the path setup for a call reporting of telephony events during conversation release of the path on the V5 interface call collision resolution on the V5 interface and handling of new calls in case of overload conditions in the LE Control Protocol It provides control functions which are applicable either for individual PSTN ports or for all the PSTN ports at the same time The control functions cater to blocking unblocking of ports meant for maintenance purposes USER MANUAL T Chapter 2 E1 MAX J LE V5 INTERFACE TRUNKS LINES FIG 2 1 LE AN CONNECTIVITY AN
46. face Specifications ETSI ETS300347 1 Sep 1994 V5 2 Interface Specifications ITU G 965 V5 2 Interface National Standards TEC G VAN 02 01 Sep 1996 V5 1 Interface Specifications ETSI ETS300324 1 Mar 1993 V5 1 Interface Specifications ITU G964 V5 1 Interface National Standards TEC G VAN 01 01 1996 Q 920 and Q 921 CCITT Recommendations 703 G 704 and G 706 CCITT Recommendations C DOT DSS MAX General Description C DOT DSS MAX XL General Description C DOT DSS MAX Exchange Operations C DOT 7 General Description OAM Specification for AN Interface in MAX USER MANUAL 82 1 Capacity Base Module 2 Engineered Capacity BHCA 3 Ports Connectivity 4 Numbering Plan Directory Number Exchange code 5 No of Exchange codes max Directory Numbers 6 Type of register signalling 7 Type of Hardware supported 8 Maximum Trunk Groups 9 Types of Trunk Groups 10 No of Categories 11 No of routes in an exchange 12 Depth of Analysis 13 Total no of Charge Rate Number 14 of Priorities USER MANUAL Technical Specifications 2048 Terminations 512 TS 1 4 concentration 12 5k BM 100k MAX L 300k MAX XL 8k MAX L 16 BM without concentration 16k MAX XL 32 BM without concentration 20 digits 4 to 7 digit 1 to 4 digit 60 of 1000 nos each or 4 of 10000 Nos each 60k 2 Decadic MFR2 2W analog trunks 4 E M trunks Digital Trunks on Type I Type II Type III and CC
47. ge of Billing and Traffic data Exchange data d Exchange Management Functions IOP VH Architecture The IOP VH is defined as Value Engineered High performance IOP It is designed on a single card named VHC The IOP card is not duplicated but IOP as a module is duplicated The CPU was 68040 25 processor and is housed on the VHC card It has 16 MB DRAM onboard and 512KB EPROM All active IOP processes reside in dynamic RAM and hence the data coming from going to HDLC links secondary storage device and terminals use dynamic RAM The system has provision for 7 HDLC channels two of these are used to connect the IOP to both copies of AP BP The third link is for connection with mate IOP so that both can work in synchronisation in duplex IOP configuration Eight channels of RS 232C Serial Links through ASIO ports are also implemented for connecting operator terminals and printer to IOP in addition to two ports for console and host The provision for one X 25 port is also there which can be used for 64 kbps full duplex link via modem with synchronous RS232 support at physical level In addition provision for one 10 Mbps Ethernet port is also there in IOP VH which has AUI or co axial interface support at physical level C DOT V5 X INTERFACE 3 3 3 4 3 5 C DOT DIGITAL SWITCHING SYSTEM REMOTE SWITCH UNIT Remote Switch Unit RSU is an integral part of C DOT Digital Switching System In order to realise a RSU the
48. general description for the Access Network connectivity with C DOT Digital Switching Systems over ETSI ITU V5 interface The aim of this document is to describe V5 interface its implementation in C DOT digital switching systems hardware and software architecture to support standard V5 interface The intended users for this document are various access network vendors DOT and C DOT switch manufacturers 1 2 SCOPE This document covers the description of C DOT Digital Switching System with V5 interface capability It defines the physical connectivity and the hardware to be used for interfacing with Access Network It also gives the provisioning requirements as well as operations and maintenance aspects of the system 1 3 NEED FOR V5 INTERFACE To overcome the complex requirements of network planning of connecting the scarcely distributed villages or to add new subscribers in already congested metros a new interface has been developed This interface connects Local Exchange to Access Network and widely known as V5 interface This is a standard interface based on ETSI ITU specification Here subscribers are directly connected to Access Network but logically they are the part of Local Exchange Numbering plan billing and other call processing related activities are performed at Local Exchange By using this methodology of V5 interface the physical distribution of subscriber cables from Local Exchange to subscriber premises is reduced to negligib
49. he call control and interface maintenance activities are performed by the layer 3 protocols Five different type of protocols are present at layer 3 These are PSTN Control BCC Link Control and Protection The first two are supported by V5 1 interface whereas V5 2 supports all the five protocols The responsibility for call control lies with the Local Exchange The access management in the Access Network and the service management in the Local Exchange each maintain their Finite State Machines and protocol entities and communicate over V5 interface Distribution of Local Exchange and Access Network functions are as follows Local Exchange Call Processing control e Subscriber Numbering Plan Call Detail Record Collection Billing USER MANUAL 9 Chapter 2 Supplementary Services 3 Party Call waiting Call forwarding etc e Answer Supervision Concentration Time slot Allocation Access Networks e Resource Management and Allocation together with LE e Physical or Wireless connectivity V5 interface is classified into two categories 1 V5 1 interface 2 V5 2 interface 2 3 1 V5 1 Interface Figure 2 2 V5 1 interface consists of a single 2 048 Mbps link comprising thirty two 64 kbps channels In a network V5 1 interface is primarily used to connect multiplexers In a single V5 1 interface 30 subscribers can be supported each having a dedicated 64 kbps channel called bearer channel Remaining two channels ar
50. inks from this BM is required for networking Announcement card can be inserted in one of the available TU and will consume 16 time slots In MBM VU and SU both can not be configured in same Base Module SU is configured in trunk BM only whereas VU is configured in line BM Maximum of 3072 V5 subscribers per BM is supported It is possible to configure VU in Remote BM also USER MANUAL 33 Chapter 5 Hardware Architecture of V5 Interface 5 1 5 2 5 2 1 34 Unit INTRODUCTION To support V5 x interface in C DOT Digital Switching System a new hardware unit called VU V5 Interface unit is required All the layer 2 and layer 3 software for V5 interface resides in this unit VU works in conjunction with DTU which in turn extends the 2 048 Mbps digital link 1 towards Access Network Following sections describe the hardware architecture of VU and its interconnection with Digital terminal unit HARDWARE ARCHITECTURE OF VU Hardware architecture of VU V5 unit is same as that of SU SS7 unit SU contains software for SS7 signalling whereas VU contains software for V5 interface VU consists of PHC CUL CPU memory TUC TUI and power supply cards see Fig 5 1 PHC card is also known as SHM Signalling Handler Module Card Signalling Handler Module SHM The function of Signalling Handler Module SHM is to perform protocol processing on the received messages from eight 64Kbps links as well as to transmit on these links
51. le length or totally removed in case of wireless This makes the whole operation very cost effective and also eliminates the hardship of digging the road and laying down the subscriber cables USER MANUAL 5 Chapter 1 1 4 ORGANISATION OF THE DOCUMENT This document has been organised in seven chapters including the present one Chapter 2 describes the V5 interface along with definitions of new terminologies used Further it tells about the advantages of V5 interface over proprietary interfaces and differences between V5 1 amp V5 2 interfaces Chapter 3 presents the system architecture of C DOT Digital Switching System in brief This will help in understanding the fundamental of C DOT Digital Switching System Chapter 4 helps in understanding the implementation of V5 interface in C DOT Digital Switching System Chapter 5 describes hardware architecture of V5 Interface Unit VU Chapter 6 is on software architecture of V5 interface in C DOT Digital Switching System It also deals with call processing handling and different call flow scenarios Chapter 7 describes the man machine interface MMI for operations and maintenance functions of V5 interface in C DOT Digital Switching System C DOT V5 X INTERFACE 2 1 2 2 2 V5 Interface INTRODUCTION V5 interface is the connectivity between Local Exchange MAX and Access Network based on ETSI ITU specifications see reference Messages are exchanged b
52. m the List Old Stop Date Old Stop Time New Stop Date New Stop Time DISPL TRF RPT Modified Command Description This is an existing command in MAX and can also be used for displaying the traffic report s of AN interface s under traffic observation Input Parameters Input form remains unchanged Refer 11 In RPT ID parameter V5 1 REP or V5 2 REP shall be used Output Form The output form of traffic report for different case is given in 18 USER MANUAL 73 Chapter 7 74 START TRF RPT Modified Command Description This is an existing MAX command and can also be used to start traffic reports for AN interface s Input Parameters RPT TYP In addition to existing values it has new value to start traffic reports for AN Interfaces Output Form Following output report shall be displayed after successful execution of the command START A SPECIFIED TYPE OF TRAFFIC REPORT REPORT TYPE UNIT PERIODICITY AN Interface MIN 60 Input Parameters Input form remains unchanged Refer 11 In RPT ID parameter V5 1 REP or V5 2 REP shall be used MOD RPT PERDTY Modified Command Description This is an existing MAX command and can also be used to modify the periodicity of AI traffic report Input Parameters RPT TYP j AI REP TIM UNIT Existing MAX parameter RPT PRD Existing parameter Output Parameters Following report shall be displayed after successful execution of the comma
53. mand Description This is an existing MAX command which shows AICHNL ANSUB and PHC terminals in output if they are in the status given as input Input Parameters MOD NO STAT TRM Output Parameters The output report format is same as that of command DISPL TRM STATUS 7 5 PROCEDURE FOR OPERATING AN ACCESS NETWORK INTERFACE IN MAX 7 5 1 Procedure to Equip Access Network in MAX Step 1 Equip a frame as VU using command EQUIP FRAME with FRM TYP VU Note that SU cannot be equipped in concentration with VU and vice versa Step 2 Equip PHC Card s in slot 7 8 9 or 10 of the VU frame using command EQUIP TRML CARD with HW TYP PHC Step 3 Equip the DTK card where the E1 links of AI are terminated as HW TYP DTK CCS Step 4 Equip the ACCESS NETWORK in the switch using command CRE AI See 7 2 1 for details of the command 76 C DOT V5 X INTERFACE 7 5 2 7 5 2 1 7 5 3 7 5 3 1 7 5 8 1 1 7 5 3 2 7 5 3 3 OPERATION AND MAINTENANCE Procedure to Create AN Access Network Subscriber Assuming that AN interface has already been configured the following command should be executed to create a subscriber 1 CRE SUB Remarks i For creating AN subscriber no TEN value should be given Instead AISUB ID should be given i L3 addr should belong to AN interface If interface type is V5 1 L3 addr should be lie with start L3 address and start L3 address 23 and if interface type is V5 2 the 13 add
54. meet service quality requirements need for additional equipment may arise in many cases To provide satisfactory economic solution to this the digital exchange can be split by provision of a part of the equipment designated as Remote Switching Equipment placed close to the subscriber premises to minimise the loop lengths A maximum of three levels of Remote Switching Equipment may be provided Fig 2 4 shows a Digital Exchange with different levels of remoting The following equipment are used for remoting USER MANUAL 13 Chapter 2 PROPRIETARY V5 2 gt RSU 4 gt RLC MUX lt t Ist LEVEL OF REMOTING 2 IInd LEVEL OF REMOTING V5 2 V5 1 gt RLC SSB MUX C DOT DSS V5 1 gt MUX RSU gt RSU REMOTE SWITCH UNIT gt REMOTE LINE CONCENTRATOR MUX gt MULTIPLEXER FIG 2 4 REMOTING PRINCIPLES V5 1 LEVEL OF REMOTING DESIGN ANINTRFC PSTNRMP 14 C DOT V5 X INTERFACE 2 6 2 6 1 2 6 2 V5 INTERFACE i Remote Switch Unit RSU Used 1st level remoting equipment in three level remoting 11 Remote Line Concentrator RLC Used as Second level remoting equipment in three level remoting and as first level remoting equipment in two level remoting iii Multiplexer MUX Used as last level of remoting equipment Interconnection between main switch and RLC MUX RSU and RLC MUX or RLC and MUX is through 2
55. n Interface New Command Description This command is used for configuring an AN interface V5 1 and V5 2 data in the exchange The AN should have already connected to the exchange through E1 links Input Parameters AI NUM AI NAME AI TYP VAR ID AI CTG 1 ST L3ADR AI LNK PRI LNK SEC LNK INVALID PROT INF None 64 C DOT V5 X INTERFACE OPERATION AND MAINTENANCE Output Form Following is the output report displayed after successful execution of command CREATE ACCESS NETWORK INTERFACE REPORT AN Interface Number AN Interface Name AN Interface Type Varient id Start L3 Address AN Interface Category AN Interface Links added AN Interface Links not added Primary Link Secondary Link Protocol information 7 2 2 DEL AI Delete AN Interface New Command Description This command is used to delete a particular AN Interface from MAX Input Parameters AI NUM AI NAME Only one of them should be given Output Form USER MANUAL Following is the output report displayed after successful execution of command DELETE ACCESS NETWORK INTERFACE REPORT AN Interface Number AN Interface Name AN Interface Type 65 Chapter 7 7 2 8 DISPL AI CHAR Display AI Characteristics New Command Description This command will be used to display the information of a particular AN interface Input Parameters AI NUM AI NAME Output Form Following output report will be
56. nal digit gt Signal ACK lt Signal digit Seizure lt Ringing Phase Inband ring back tone Ind lt lt Answer lt Conversation Called party clears CSH Timer started Calling party On hook Signal on hook CSH Timer clears Release gt gt cancelled phase Signal Ack lt m M M m Deallocation lt Deallocation Complete mm n num mm mmm m gt Disconnection lt n nn
57. nd MODIFY PERIODICITY OF A TRAFFIC REPORT REPORT TYPE UNIT OLD NEW AN Interface C DOT V5 X INTERFACE OPERATION AND MAINTENANCE 7 4 8 DISPL NUM NAME Modified Command Description This is an existing MAX command which can also be used to see all the existing AN interfaces in the system Input Parameters ENT TYPE AI To be given to see Existing Ais ENT NUM ALL ENTITIES or known AI num can be given ALL ENTITIES or known AI name be given Both ENT NUM amp ENT cannot have non default value Output Report Following report shall be displayed after successful execution of the command REPORT FOR DISPL NUM NAME jd ENTITY TYPE ACCESS NETWORK INTERFACE ENTITY NUMBER ENTITY NAME 1 4 9 DISPL TRM STATUS sss Modified Command Description This is an existing MAX command which can also be used to see status of AN subscribers and AI channels It is used to see the status of PHC terminals also Input Parameters STAT TRM ALL TML TYP TEN DIRNO TEN value is to be given when TML TYP AICHNL PHC and DIRNO is to be given for TML TYP ANSUB USER MANUAL 15 Chapter 7 Output Report Following output report shall be generated when command is executed successfully i when TML TYP STAT TRM ALL TML TYPE TEN STAT TRM 11 when TML T ANSUB AICHNL STAT TRM ALL TML TYPE AI NUM AI STATUS DIR TEN STAT 7 4 10 DISPL TRM ALL Modified Com
58. normal SBM exchange can be modified for remote location and communication with the host exchange is via 2 Mbps digital links The number of 2 Mbps streams between the host and the RSU is primarily determined by the traffic between them As far as call processing is concern RSU is an autonomous exchange capable of local call completion Operation and maintenance functions are handled by the host exchange Remote Switch Unit can work in normal mode or standalone mode During the normal mode of operation the control and data links to the host are available In the event of failure of these links RSU goes into standalone mode of operation During the transition from one mode to another intra RSU calls are maintained and fresh call requests are accepted In case it is not possible to process a call request due to unavailability of links to the host the subscriber is connected to appropriate tone or announcement During standalone mode of operation metering information of all the subscribers is stored in the RSU and sent to the host whenever the links are available again ALARM DISPLAY PANEL Alarm Display Panel ADP is a unit which is attached to the BP in SBM configuration or AP in MBM configuration via HDLC links for providing audio visual indication of system faults A matrix of LEDs is provided to indicate the maintenance status of the switch units and their level of Initialisation A seven segment display shows the count of links and trunks
59. odule In the reverse direction after space switching has been done in the Space Switch under the control of Space Switch Controller SSC two parallel buses carry the switched voice information for 512 subscribers each at 4 Mbps towards the Base Modules Administrative Module Administrative Module consists of a duplicated 16 32 bit controller called the Administrative Processor Controller It communicates with Base Processors via the Central Message Switch for control messages and with the duplicated Input Output Processors in the Input Output Module for interfacing peripheral devices USER MANUAL 93 Chapter 3 3 2 4 3 2 4 1 24 Administrative processor is responsible for global routing translation resource allocation and all other functions that are provided centrally in C DOT Digital Switching System Input Output Module C DOT IOP Tower type is used as front end processor in C DOT Digital Switching System It communicates with Digital Switching System on high speed data links It contains fault tolerance software a layer above UNIX V2 which ensures data consistency between Digital Switching System and IOP IOP basically handles all the input and output functions in Digital Switching System All the commands from operator are received and analysed by IOP The major functions performed by C DOT IOP are listed below a Down loading and Initialisation of Digital Switching System b Man Machine Interface Stora
60. pplies on the copy 1 side will assert an error when its mate goes bad The requirement is that the amount of current drawn should be more than 10 amperes The resistance value in CUL are fixed in such a manner that one CUL consumes approximately 2 3 amperes Hence to meet the requirements by the power supplies two CUL will be required CPU Card CPU card is known as Signalling Controller Card SCC which can be either BPC or the HPC card SHM can interface with both the cards The shared memory in SHM card is available to both the SCC and SHM cards The size of the shared memory is 256 KB when interfaced with BPC or 512 KB when interfaced with HPC The BPC card is the controller card for VU It provides variety of I O s and capable of interfacing through a standard 68010 bus to BME card The BPC card is designed to operate with two memory cards BME cards for duplex read and write It uses motorola 68010 a 16 bit processor with on board 32 k RAM and 128 k ROM The BPC also provides six HDLC links to the outside world one of which is reserved for communication with the mate HPC card is the advanced version of BPC card which uses 68040 a 32 bit processor which is powerful than 68010 used in BPC It has on board 512K ROM and 16 MB RAM Terminal Unit Controller TUC Card The TUC in VU acts as an interface between PHC terminal and time switch All the signalling messages on V5 interface on TS16 of active link come to PHC card via TS
61. r should lie between start L3 address and start L3 address 3071 iii L3 address should not be in use already for another AN subscriber iv LIN TYP should not PBX PBX RVRS2 v should have non default value only when interface type is V5 1 and it should not be in use by another subscriber when given Procedure for Maintenance of AN Interface To Make AN Interface OOS There are several ways described in 7 5 3 1 1 to 7 5 3 1 2 to make the AI OOS AI will be down also when VU is down By making Primary Secondary link OOS If AI has only one link then give command FRC DTK OOS for the link and if it has secondary link also than give FRC DTK OOS for both primary and secondary Status can be reversed by FRC DTK INS command By making VU OOS VU can be brought OOS by making both the TUCs of VU out of service In this state all the AI links connected to the exchange will be down TUCs can be made OOS by FRC SWU OOS and brought inservice by command PUT FRC SWU INS To make links of AN Interface OOS Individual links except primary and secondary can be made OOS through command PUT DTK OOS or FRC DTK OOS They can be brought inservice through command PUT DTK INS or FRC DTK INS USER MANUAL 77 Chapter 7 7 5 3 4 To make AN Subscriber OOS The subscribers of the AN interface can be made OOS using the command PUT TRM OOS FRC TRM OOS For AN subscribers the command will work with DIRNO of the subscriber
62. ser s Manual USER MANUAL 79 BS BSC C CHANNELS CER CMR DLE DSS DTU 1 EQN ETSI FITL GPC GRRA HDT ISDN LE Appendix B Glossary Access Network Bearer Channel Connection Basic Rate Access Base Station Base Station Controller Communication Channels 167 time slot of E1 link Call Event Record Call Manager Data Link Entity Digital Switching System Digital Terminal Unit 2 048 Mbps PCM Link Equipment Number Euopian Telecommunications Standards Institute Fiber In The Loop Global Path Control Global Routing and Resource Allocation Host Digital Terminal Integrated Services Digital Network Local Exchange Main Automatic Exchange Generic Term Used for C DOT Family of Digital Switching Systems Main Automatic Exchange Large Main Automatic Exchange Extra Large Man Machine Interface Optical Network Unit C DOT V5 X INTERFACE POTS PRA PSTN SBM SCP SMH SU 5 WLL USER MANUAL GLOSSARY Originating Terminal Process Protocol Handler Card Plain Old Telephone System Primary Rate Access Public Switched Telephone Network Single Base Module Status Control Process Signalling Message Handler 7 Signalling Unit Terminating Terminal Process Standard Interface Specified by ETSI between LE and AN V5 Unit Wireless in Local Loop 81 1 2 3 4 5 6 7 8 9 10 11 12 13 References V5 2 Inter
63. tch via a 128 channel PCM link operating at 8Mbps The hardware description of VU is given in Chapter 5 V5 subscribers are connected to LE through E1 links of V5 interface Each of these 1 links are terminated on DTU One DTU can support maximum of 4 E1 links If the DTU is equipped with its maximum capacity 1 with 4 E1 links for 5 interface s then no further concentration is allowed as all the 128 time slots are nailed up between DTU and TSC However if a DTU is not catering to 4 E1 links of V5 X interfaces then it can be used in concentration as it has free time slots which can be used in on demand basis only The VU requires maximum of 32 time slots so remaining 96 time slots of that TUC called VUTUC can be used to support V5 or other subscribers connected through DTU or ATU which can be placed in concentration with VU In C DOT Digital Switching System one BM can support maximum of 3072 V5 subscribers connected through one or more V5 2 interfaces Each V5 subscriber is identified uniquely by its directory number and AISUB ID see sec 7 1 7 for description whereas as each land line subscriber is identified by its directory number and TEN All the processing of signalling data of V5 subscribers is carried out in VU SU and VU both can not be concentrated together USER MANUAL 31 Chapter 4 1 2 3 4 5 6 7 8 10 11 13 14 15 16 17 18 19 2021 22 23 24 25 26
64. tial Parameter 62 C DOT V5 X INTERFACE 7 1 23 TML TYP PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK 7 1 24 UNIT ID PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK 7 1 25 UNIT TYP PARAMETER NAME MNEMONIC DEFINITION TYPE POSSIBLE VALUES DEFAULT REMARK OPERATION AND MAINTENANCE Terminal Type TML TYP It is an existing parameter It identifies the type of terminal Alphanumeric New values corresponding to AN interface are ANSUB AICHNL None These values of parameter is not value for command DISPL LSCNT OOS Unit Identification UNIT ID It is an existing parameter Alphanumeric New values corresponding to VTU s units are VU 0 VU 1 VMU 0 and VMU 1 None Unit Type UNI TYP It is an existing parameter Alphanumeric New values corresponding to VTU s units are VU and VMU None USER MANUAL 63 Chapter 7 7 1 26 VAR ID PARAMETER NAME Variant Identification MNEMONIC VAR ID DEFINITION It denotes an independent set of AN Interface related data Different sets are given different variant id s The variant id for a working AN Interface must have the same value at LE and AN ends TYPE Numeric POSSIBLE VALUES Oto 127 DEFAULT None REMARK 7 2 ALINTERFACE ADMINISTRATION COMMANDS Following commands are available for the Al interface administration in the MAX 7 2 1 CRE AI Create A
65. to display the count of PHC terminals given as TML TYP PHC of a particular type This is an existing command in which new parameter FRM TYP is added which will take value VU or SU in case of PHC terminals Input Parameters TML TYP FRM TYP None STAT TRM 4 MOD NO Output Form i When TML TYP PHC amp STAT TRM ALL EQ FRM TYP OOS_SYS OOS OPR OOS EXT OOS SE INS 1 When TML TYP amp STAT TRM other than ALL STATUS EQ COUNT 7 4 3 DISPL AI STATUS New Command Description This command is used to display the status of an AN interface Input Parameters AI NUM AI NAME None Command is to be invoked by giving input value to only one parameter field not both Output Form ACCESS NETORK INTERFACE STATUS INTERROGATION REPORT AN Interface Number AN Interface Name AN Interface Type AI STATUS AN Interface Type ACTIVE LINK ACTIVE PHC id 72 C DOT V5 X INTERFACE OPERATION AND MAINTENANCE STANDBY LINK Std by PHC id MOD AI OBS New Command Description This command is used to put AN interface s under traffic observation or for deleting AN interface s from traffic observation Input parameters ADD AI None DEL AI None DEL ALL OBS PRD 0 0 0 0 STP DTE None STP TME 0 0 Output Form MODIFY ACCESS NETWORK INTERFACE OBSERVATION REPORT AN Interface Added to the List AN Interface Deleted fro
66. tus of subscriber during conversation allocation deallocation of resources to subscriber C DOT V5 X INTERFACE SOFTWARE ARCHITECTURE 6 2 3 Maintenance Subsystem The Maintenance Subsystem is responsible for maintenance of AN interface AI links AI channels and AN ports It is also responsible for VU Initialisation and downloading of data to VU All the processes of this subsystem reside in AP BP VCPU and PHC 6 3 MESSAGES AND THEIR FLOW IN V5 PROTOCOL As we know V5 protocol is message based i e any information between LE and AN is exchanged through messages available in different protocol The list of messages available in different protocols is given below a PSTN PROTOCOL E ESTABLISH n ESTABLISH ACK iii SIGNAL iv SIGNAL ACK STATUS vi STATUS ENQUIRY vi DISCONNECT DISCONNECT COMPLETE b CONTROL PROTOCOL 1 PORT CONTROL 11 PORT CONTROL ACK COMMON CONTROL iv COMMON CONTROL ACK PROTOCOL 1 ALLOCATION li ALLOCATION COMPLETE iii ALLOCATION REJECT iv DE ALLOCATION v DE ALLOCATION COMP vi DE ALLOCATION REJECT USER MANUAL 43 Chapter 6 6 8 1 6 3 1 1 44 AUDIT AUDIT COMPLETE ix AN FAULT x AN FAULT ACK xi PROTOCOL ERROR LINK CONTROL PROTOCOL i LINK CONTROL ii LINK CONTROL ACK PROTECTION PROTOCOL li SWITCH OVER REQUEST 11 SWITCH OVER SWITCH OVER COM iv SWITCH OVER REJECT PROTOCOL ERROR
67. with the Base Processor and between PHCs is handled by the 7SU CPU 7CPU complex which has the same hardware as the BPC complex in the Base Processor Unit 7CPU is the central control of the 7SU The 557 protocol software is distributed over PHCs Level 2 7CPU Level 3 and BPC part of Level 3 and Level 4 The design goal for 7SU traffic capacity has been to cater for busy hour message traffic equivalent of 16000 trunks in the case of TAX being a node in an IDN each handling say 30 40 BHCA A minimum of two SS7 links per route may be provided for reliability While each SS7 link may ideally carry message traffic equivalent of maximum of 1000 voice circuits in practice however there may be more routes with much less number of voice circuits thus increasing the number of SS7 links with a total message traffic equivalent of 16000 trunks NETWORK SYNCHRONISATION Network synchronisation in C DOT DSS is implemented in the following two ways Network Synchronisation Controller NSC in MAX XL e Network Synchronisation Equipment NSE is SBM or MBM Network Synchronisation Clock Card NSC The NSC card is placed in the SCU Space Switch Controller Unit frame of the CM XL cabinet It interfaces on the CPU bus of SSC Space Switch Controller and shares the bus with CBX CPU Bus Extender Card and memory card The functions of the card include NSC card forms the interface between DTS Digital Trunk System th

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