The document provides an overview of the C-DOT MBM-XL switching system, including its hardware architecture and features. It describes the different modules that make up the system, such as the base module, central module, line modules, and terminal units. It also discusses the various subscriber and system features supported, such as calling line identification, call forwarding, and software upgradation. Finally, it mentions the use of remote switch units to provide solutions for large exchanges and reduce cable costs.

1. C-DOT MBM-XL OVERVIEW
S.K.TYAGI
ALTTC, Ghaziabad

2. Introduction
C-DOT MBM-XL OVERVIEW COVERS THE
HARDWARE ARCHITECTURE AND FEATURES
OF THE C-DOT MBM-XL SWITCHING SYSTEM
IT COVERS THE DIFFERENT USES OF THIS
SYSTEM IN THE NETWORK
CCS#7 & ISDN IMPLEMENTATION IN C-DOT
WILL ALSO BE DISCUSSED

3. C-DOT MBM-XL ARCHITECTURE
AM
BM
1
BM
n
CM
MDF
IOM
ADP
DISK TAPE VDUPRINTER
SUBSCRIBER LINES
ANALOG TRUNKS
DIGITAL TRUNKS
DIGITAL LINKS
FORM RSUs

4. C-DOT SBM-XL
LINE MODULE BASE MODULE LINE MODULE
Time Switch Unit
Base Processor Unit
Terminal Unit
Terminal Unit
Terminal Unit
Terminal UnitTerminal Unit
Terminal Unit
Terminal Unit
Terminal Unit
Terminal Unit
Terminal Unit
Terminal Unit
Terminal Unit
Terminal Unit
Terminal Unit
Terminal Unit
Terminal Unit

5. C-DOT MBM-XL
BASE MODULE CENTRAL MODULE BASE MODULE
Administrative
Processor Unit
Space Switch
Control Unit
Space Switch
Unit
Bus Termination
Unit
Space Switch
Unit
Bus Termination
Unit
Terminal Unit
Terminal Unit
Terminal Unit
Terminal Unit
Terminal Unit
Terminal Unit
Base Processor Unit
Time Switch Unit
Terminal Unit
Terminal Unit
Base Processor Unit
Time Switch Unit

6. SUBSCRIBER FEATURES
Number Identification Service
Calling Line Identification
Presentation(CLIP)
Calling Line Identification
Restriction(CLIR)
Calling Line Identification
Restriction Override
(CLIRO)
Malicious Call Identification(MCID)

7. SUBSCRIBER FEATURES
Call Offering Supplementary
Services
Call Forwarding
Unconditional(CFU)
Call Forwarding Busy (CBF)
Call Forwarding No Reply (CNFR)
Call Completion Services
Call Waiting
Call Hold

8. SUBSCRIBER FEATURES
Multi - Party Services
Three Party Conference
Multi Party Conference(Add-on
Card)
Miscellaneous Services
Hot Line(Timed)
Hot Line (Without Time Out)
Reminder Call/Alarm Services

9. SUBSCRIBER FEATURES
Subscriber Controlled Call Restriction Services
Intrusion Barring Service
Dialling By Terminal Equipment Number
Trunk Offering
Queuing Service
Priority Subscriber
Distinctive Ringing For Long Distance Calls

10. SYSTEM FEATURES
Signalling, Routing And Charging Features
Exchange Operation Features
Exchange Maintenance Features
Software Upgradation & Patch Administration
Reconfiguration for Different Applications

11. P
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ANALOG TERMINAL UNIT
*VACANT SLOT OF PSM/ESM FILLED BY CML CARD

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INTEGRATED SERVICES DIGITAL
TERMINAL UNIT
*VACANT SLOT OF PSM/ESM FILLED BY CML CARD

13. P
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BUS TERMINATION UNIT
*VACANT SLOT OF PSM/ESM FILLED BY CML CARD

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BUS TERMINATION UNIT
*VACANT SLOT OF PSM/ESM FILLED BY CML CARD

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BUS TERMINATION UNIT
*VACANT SLOT OF PSM/ESM FILLED BY CML CARD

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BUS TERMINATION UNIT
*VACANT SLOT OF PSM/ESM FILLED BY CML CARD

17. P
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SPACE SWIYCH UNIT
*VACANT SLOT OF PSS FILLED BY CSL CARD

18. P
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SPACE SWITCH CONTROLE UNIT

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ADMN PROCESSOR UNIT

20. SIGNALLING UNIT MODULE
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987654321 2
6

21. REMOTE SWITCH UNIT
REMOTE PRODUCTS
Remote Switch Unit(RSU)
Remote Line Unit(RLU)
Remote Line Concentrator(RLC)
NEED FOR REMOTE SWITCH UNIT
Solution for Space for large exchanges
Reducing the cost on cables

22. REMOTE SWITCH UNIT
REMOTE SWITCH UNIT FEATURES
Power On Initialization
Digital Trunk Link Status
Call Shifting During DTK Fault
Initialization In Stand Alone Mode
Initialization From RBMSA To Normal (RBM)
Mode

23. REMOTE SWITCH UNIT
REMOTE SWITCH UNIT FEATURES
Support For Trunks In RBM
Numbering Scheme In RSU
Support For Different Area Code In RSU and
Main Exchange
Provision To Block Local Calls Between Main
Exchange and RSU If RSU have Different
Area Code

24. REMOTE SWITCH UNIT
REMOTE SWITCH UNIT FEATURES
Emergency Services In RBMSA Mode
Charging For RBM
Line To Line Call
Line To Trunk Calls
Trunk To Line Calls(I/C Terminating)
Trunk To Trunk Calls

25. REMOTE SWITCH UNIT
RSU RELATED COMMANDS
CRE-RBMSA-CONFIG
DISPL-RBMSA-CONFIG
MOD-RBM-XCOD
DISPL-RBM-XCOD
ADD-DTK-RBM
DISPL-RBM-DTKS
MOD-SUB-CRG
DISPL-SUB-CRG

26. C-DOT 256P AN-
RAX and RLC
FEATURES

27. FEATURESProvides front end termination for PSTN subscribers
Supports maximum of 248 PSTN subscribers
Connected to Local Exchange (LE) over one or two E1 links
using standard V5.2 Protocol as per ITU-T specifications
G.964 & G.965 and ETSI specifications 300-324 & 300-347.
Provides First/Second Level of remoting
Provides a transparent link between subscriber and Local
Exchange
Provides Calling Line Identification Presentation (CLIP) on 2
ports of LCC card
Provides 16KHz Metering Pulse and Calling Line
Identification Presentation (CLIP) on 2 ports of each CCM
card
Provides Reversal on all 8 ports of CCM card
Provides Man Machine Interface (MMI) using VT 100 dumb

28. FEATURES
Password Protection
Requires no air-conditioning
Low Power Consumption
Line Testing can be performed locally
Transparently supports all subscribers
feature as supported by Local Exchange
(LE)
For any feature related enhancements,
the S/W changes are to be done on
Local Exchange (LE) only
(Contd.)

29. HARDWARE
Consists of two controller cards
AN RAX Controller Card (ARC Card)
AN RAX Interface Card (ARI Card)
ARC card supports 2 E1 links toward
Local Exchange
Both the cards form a security block
alongwith respective SPC cards
Redundancy in Controller Cards
8 port LCC/CCM cards for Subscriber
Interface
RTC card for testing of subscriber ports

30. 256P RAX CARD FRAME CONFIGURATION
1 2 3 4 8765 13 14 15 161211109 21 22 23 2420191817
P
S
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C
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SLAVE
FRAME
MASTER
FRAME
T
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C T
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C C
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Ø
Ø
R
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1
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32 CH. PCM
TG 5 6TG
{
COPY Ø 1COPY
{
TG 7 TG 8
Ø 1
Ø 1
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TC :
RAP :
RAT :
RTC :
RSC :
SPC / ISP:
RMF :
LCC/TWT/EMF/RDT/CCM CARD
RAX ADMINISTRATIVE PROCESSOR
RAX ANNOUNCEMENT AND TONE CARD
RAX TERMINAL TEST CARD
RAX SWITCH CONTROLLER CARD
SIGNALLING PROCESSOR CARD / INTEGRATED SIGNALLING PROCESSING CARD
RAX MULTI FREQ. CARD
C
T
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25 26
C
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T T
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/
SLAVESLAVE
PSU-I : POWER SUPPLY UNIT-I
CONFERENCE CARDCNF :
{
{COPY Ø
MASTER
COPY 1
MASTER
Ø
/
C
T
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D
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/
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D
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- - - -
- -
CARD DETAILS :
RAX WLL CONTROLLER CARDRWC:
W
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C
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/
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/
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DESIGNANRX-UMArgu-cf

31. 256P AN-RAX CARD FRAME CONFIGURATION
1 2 3 4 8765 13 14 15 161211109 21 22 23 2420191817
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C
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{
COPY Ø 1COPY
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Ø 1
Ø 1
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Ø
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TG 1 2TG TG 43TG
TC :
RTC :
SPC / ISP:
LCC/CCM CARD
RAX TERMINAL TEST CARD
SIGNALLING PROCESSOR CARD / INTEGRATED SIGNALLING PROCESSING CARD
C
T
C
T
C
T
C
T
25 26
C
T
C
T T
C
T
C
SLAVESLAVE
PSU-I : POWER SUPPLY UNIT-I
AN-RAX CONTROLLER CARDARC :
{
{COPY Ø
MASTER
COPY 1
MASTER
- - - -
- -
CARD DETAILS :
I
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/
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P
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/
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/
DESIGNANRX-UMArgu-cf
AN-RAX INTERFACE CARDARI :
C
T
C
T
C
T T
C
T
C
C
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C
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32. CONNECTIVITY TO
NETWORK
N
E
T
W
O
R
K
Local
Exchange
C-DOT
MBM
OR
Other
MNC
Exchanges
DEC/R2/#7 V5.2 Interface
Primary
Link
Secondary
Link
AN-
RAX 248 Subscribers
RS232
Console
VT-100

33. DIFFERENCE BETWEEN
C-DOT RSU AND C-DOT AN-RAX
C-DOT RSU C-DOT AN-RAX
• First Level of Remoting • First/Second Level of
Remoting
• Connected to LE through
Proprietory Protocol
• Connected to LE through
Standard V5 protocol
• In standalone mode it performs
the various call processing &
Billing functions
• In standalone mode it only
feeds the tone/ announcement
to the subscriber

34. REMOTE LINE CONCENTRATOR(RLC) AS
ACCESS NETWORK

35. FEATURES
Provides front end termination
Supports maximum of 120 PSTN subscribers
Supports maximum of 56 ISDN BRA subscribers
Combination of PSTN & ISDN BRA subscribers. (Compatible
motherboard)
Connected to Local Exchange (LE) over two E1 links
Provides second level of remoting
Provides a transparent link between subscribers and local
exchange

36. FEATURES
Provides 16KHz metering pulse, Reversal and Calling Line
Identification (CLI) on all ports.
Provides Man Machine Interface (MMI)
Password protection
Wall mountable (light weight)
Require no air conditioning
Low power consumption
Will provide HDSL connectivity in future
Compact in Size (19” packaging)
Line testing can be performed locally

37. C-DOT RLC CARD CAGE
MPU : MUX Power Unit to Provide Ring and Voltages
MTC : MUX Tester Card for Line Card Testing and to Provide announcement
MLC : MUX Line Card
MCS : MUX Control and Signaling Card ; E1 Link Termination and V5 Protocol Software

38. DIFFERENCE BETWEEN
RSU AND RLC
RSU RLC
• First level of Remoting • Second level Remoting
• Connected to LE
through proprietory
protocol
• Connected to LE
through Standard V5
protocol
• In 'Stand Alone' mode it
performs the various
Call Processing & Billing
Functions
• In 'Stand Alone' mode,
it only feeds the tone to
subscribers