Nortel Meridian Meridian 1 Instruction Manual

Option 11C ISDN BRI Administration and Maintenance
Meridian 1
Option 11C
ISDN BRI Administration and Maintenance
Document Number: 553-3011-311
Document Release: Standard 7.0
Date: May 1999
Year Publish FCC TM
© 1993, 1999
All rights reserved
Printed in Canada
Information is subject to change without notice. Nortel Networks reserves the right to make changes in design
or components as progress in engineering and manufacturing may warrant. This equipment has been tested
and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules, and the
radio interference regulations of Industry Canada. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This equipment
generates, uses and can radiate radio frequency energy, and if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user will be required to correct the
interference at their own expense.
Meridian 1 is a trademark of Nortel Networks.

Option 11C ISDN BRI Administration and Maintenance
Revision histor
y
April 1999 Issue7.0 released as Standard for Generic X11 Release 24.2x.
October 1997 Issue 6.00 released as Standard for Generic X11 Release 23.
July 1996 Issue 5.00 released as Standard for Generic X11 Release 22.
December 1995 Issue 4.00 released as Standard for Generic X11 Release 21B.
July 1995 Issue 3.00 released as Standard for Generic X11 Release 21A.
December 1994 Issue 2.00 released as Standard for Generic X11 Release 20.
October 1993 Release 1.00, Standard

553-3011-311 Standard 7.0 May 1999

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Option 11C ISDN BRI Administration and Maintenance
Contents
About this guide . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Chapter 1 — ISDN Basic Rate Interface . . . . . . . . 1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
ISDN Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
ISDN Basic Rate Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
ISDN BRI protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
ISDN BRI line access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ISDN BRI Packet Data Transmission . . . . . . . . . . . . . . . . . . . . . . . 11
ISDN BRI trunk access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
ISDN BRI Local Exchange/DID connectivity . . . . . . . . . . . . . . . . . . . 15
1TR6 local exchange connectivity . . . . . . . . . . . . . . . . . . . . . . . . . 16
Numeris VN2 local exchange connectivity . . . . . . . . . . . . . . . . . . . 17
Japan D70 (INS NET-64) local exchange connectivity
(non-Asia Pacific protocol) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
EuroISDN connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Asia-Pacifc connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
ISDN BRI trunk connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
ISDN BRI TIE trunk connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . 22
QSIG ISDN BRI trunk connectivity . . . . . . . . . . . . . . . . . . . . . . . . 25
Chapter 2 — Feature descriptions . . . . . . . . . . . . . 27
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
ISDN BRI specific features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Calling Line Identification Presentation and Restriction . . . . . . . . 29
National ISDN-1 Conference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

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553-3011-311 Standard 7.0 May 1999
ISDN BRI circuit-switched data calls . . . . . . . . . . . . . . . . . . . . . . . 34
ISDN BRI Special Call Forward Busy . . . . . . . . . . . . . . . . . . . . . . 38
ISDN BRI Special Hunting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
ISDN BRI ETSI Call Forwarding Unconditional . . . . . . . . . . . . . . 39
ISDN BRI ETSI Conference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
ISDN BRI National ISDN-1 Call Forward All Calls . . . . . . . . . . . 47
ISDN Basic Rate Interface Connected Line
Presentation/Restriction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
NI-1 BRI Compliance Enhancements . . . . . . . . . . . . . . . . . . . . . . . 58
Set-based ISDN BRI features on Meridian 1 ISDN BRI
terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Generic X11 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
ISDN BRI Lines — Generic X11 . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Features supported by ISDN BRI as a Line . . . . . . . . . . . . . . . . . . 87
Features partially supported by ISDN BRI as a line . . . . . . . . . . . . 92
ISDN BRI Trunk Access features: Generic X11 . . . . . . . . . . . . . . . . . 100
ISDN PRI features interaction with ISDN BRI . . . . . . . . . . . . . . . 100
ISDN PRI features not supported . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Generic X11 International features — lines and trunks . . . . . . . . . . . 102
Generic X11 International features interaction . . . . . . . . . . . . . . . . 102
Generic X11 International features partially supported . . . . . . . . . 120
Chapter 3 — Feature packaging and
prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Feature packages and prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
ISDN Basic Rate Interface (BRI) packages . . . . . . . . . . . . . . . . . . 136
ISDN BRI Trunk applications (BRIT) package . . . . . . . . . . . . . . . 137
ISDN BRI Line applications (BRIL) package . . . . . . . . . . . . . . . . 137
EuroISDN (EURO) package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
QSIG (QSIG) package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Chapter 4 — Network clocking . . . . . . . . . . . . . . . 139
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
The Need for Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Synchronization Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

Contents iii
Option 11C ISDN BRI Administration and Maintenance
Hierarchical synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Stratum Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Option 11 clock controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Tracking mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Free-run (non-tracking) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Chapter 5 — ISDN BRI line and packet data
implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
ISDN BRI line configuration guidelines . . . . . . . . . . . . . . . . . . . . . . . 154
DSL configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
SILC DSL configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Line powering options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
UILC DSL configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
ISDN BRI terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Terminal addressing and service profile assignment . . . . . . . . . . . . 175
Packet Data Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Hardware Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
NTBK22 Multi-Purpose ISDN Signaling Processor
(MISP) card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
NT6D70AA/NT6D70BA S/T Interface Line card (SILC) . . . . . . . 186
NT6D71 U Interface Line Card (UILC) . . . . . . . . . . . . . . . . . . . . . 189
NTAK09/NTAK10/NTBK50 PRI card . . . . . . . . . . . . . . . . . . . . . . 191
Data Packet Network (DPN-100) . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Network Termination 1 (NT1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
ISDN BRI terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
Installing ISDN BRI Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Installation procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Selecting the card slots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Installing the MISPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
Installing SILCs and UILCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
Installing PRI hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
Connecting ISDN BRI terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

iv Contents
553-3011-311 Standard 7.0 May 1999
Programming procedures for line application and packet data transmission
221
Chapter 6 — ISDN BRI trunk implementation . . . 241
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
ISDN BRI trunk access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
ISDN BRI local exchange/CO/DIDconnectivity . . . . . . . . . . . . . . . . . 243
ISDN BRI MCDN Tie trunk connectivity . . . . . . . . . . . . . . . . . . . 251
ISDN BRI QSIG connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
Hardware Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
NTBK22 Multi-Purpose ISDN Signaling Processor
(MISP) card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
NT6D70AA/NT6D70BA S/T Interface Line card (SILC) . . . . . . . 260
NT6D71 U Interface Line Card (UILC) . . . . . . . . . . . . . . . . . . . . . 261
Clock controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
Network Termination 1 (NT1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
Installing BRI hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
Installation procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
Selecting the card slots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
Installing the clock controller on the MISP . . . . . . . . . . . . . . . . . . 268
Installing the MISPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
Installing SILCs and UILCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270
Connecting Option 11 cables to the cross-connect terminal . . . . . . 272
Cross-connecting DSLs at the cross-connect terminal . . . . . . . . . . 276
ISDN BRI trunk software programming . . . . . . . . . . . . . . . . . . . . . . . 282
Chapter 7 — Acceptance testing . . . . . . . . . . . . . 305
Verifying ISDN BRI operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305
Setting up ISDN BRI test terminals and trunks . . . . . . . . . . . . . . . 305
Testing ISDN BRI functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309
Voice calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309
Circuit-switched data calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317
Packet data transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318
Testing ISDN BRI trunk connectivity . . . . . . . . . . . . . . . . . . . . . . 320

Contents v
Option 11C ISDN BRI Administration and Maintenance
Removing the test setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 320
Chapter 8 — Service changes and
maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
ISDN BRI maintenance commands . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
Maintenance commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
MISP and SILC/UILC message monitoring commands . . . . . . . . . 326
Changing, removing and printing an LAPD protocol group . . . . . . 327
Changing, removing and printing an MISP . . . . . . . . . . . . . . . . . . . 329
Changing, removing and printing an SILC or UILC . . . . . . . . . . . . 331
Changing or Removing a DSL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332
Changing, removing and printing a TSP . . . . . . . . . . . . . . . . . . . . . 343
Isolating and correcting faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349
Newly installed ISDN BRI equipment . . . . . . . . . . . . . . . . . . . . . . 349
Previously operating ISDN BRI equipment . . . . . . . . . . . . . . . . . . 349
Isolating faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349
MISP fault isolation and correction . . . . . . . . . . . . . . . . . . . . . . . . . 352
SILC fault isolation or UILC fault isolation and correction . . . . . . 364
Replacing ISDN BRI cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
Removing and replacing the MISP . . . . . . . . . . . . . . . . . . . . . . . . . 371
Removing and replacing the SILC or UILC . . . . . . . . . . . . . . . . . . 372
Verifying operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373
Packing and shipping defective cards . . . . . . . . . . . . . . . . . . . . . . . 373
Testing and troubleshooting ISDN BRI terminals . . . . . . . . . . . . . . . . 374
Verifying a new M5317T terminal installation . . . . . . . . . . . . . . . . 374
Troubleshooting the M5317T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
Verifying a new M5209T terminal installation . . . . . . . . . . . . . . . . 376
Troubleshooting the M5209T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
ISDN BRI messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381
Basic Rate Interface messages (BRIxxx) . . . . . . . . . . . . . . . . . . . . 382
Basic Rate Interface Trunk messages (BRIT) . . . . . . . . . . . . . . . . . 395
Background signaling diagnostic messages (BSDxxx) . . . . . . . . . . 396
Software error monitor messages (BUGxxxx) . . . . . . . . . . . . . . . . 399
Equipment data dump messages (EDDxxx) . . . . . . . . . . . . . . . . . . 401

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553-3011-311 Standard 7.0 May 1999
Error monitor messages (ERRxxxx) . . . . . . . . . . . . . . . . . . . . . . . . 401
Network link messages (LNKxxx) . . . . . . . . . . . . . . . . . . . . . . . . . 402
Network and peripheral replacement messages (NPRxxx) . . . . . . . 403
Network and signal diagnostic messages (NWSxxx) . . . . . . . . . . . 405
Service change messages (SCHxxxx) . . . . . . . . . . . . . . . . . . . . . . . 406
System loader messages (SYSxxxx) . . . . . . . . . . . . . . . . . . . . . . . . 418
Chapter 9 — ISDN BRI traffic reports . . . . . . . . . . 421
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421
Traffic report types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421
Understanding Option 11 traffic reports . . . . . . . . . . . . . . . . . . . . . . . 422
Network traffic report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423
MISP/DSL traffic report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426
MISP D-channel management messages report . . . . . . . . . . . . . . . 427
MISP messages report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 428
MISP messages for BRIT application . . . . . . . . . . . . . . . . . . . . . . . 429
Generating traffic reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430
Appendix A — 2Mb PRI implementation . . . . . . . 433
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433
Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434
Circuit cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434
Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434
Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435
2.0 Mb PRI cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435
NTAK20 Clock Controller (CC) daughterboard . . . . . . . . . . . . . . 436
NTAK93 D-Channel Handler Interface (DCHI)
daughterboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 436
NTBK51 Downloadable D-Channel daughterboard . . . . . . . . . . . . 437
Installing PRI hardware: NTAK79 PRI card . . . . . . . . . . . . . . . . . . . . 437
Inspecting the NTAK79 circuit card . . . . . . . . . . . . . . . . . . . . . . . . 437
Setting the switches on the NTAK79 . . . . . . . . . . . . . . . . . . . . . . . 438
Inserting the NTAK79 into the main cabinet . . . . . . . . . . . . . . . . . 440
Connecting the cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440
Installing PRI hardware: NTBK50 PRI card . . . . . . . . . . . . . . . . . . . . 442

Contents vii
Option 11C ISDN BRI Administration and Maintenance
Inspecting the NTBK50 circuit card . . . . . . . . . . . . . . . . . . . . . . . . 442
Setting the switches on the NTBK50 . . . . . . . . . . . . . . . . . . . . . . . 443
Mounting the daughterboards on the NTBK50 . . . . . . . . . . . . . . . . 445
Inserting the NTBK50 into the main cabinet . . . . . . . . . . . . . . . . . 447
Connecting the cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 447
PRI software programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449
Procedure summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450
PRI software programming: Option 11 to Central Office (ISA) . . . . . 461
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 461
Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 461
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 462
Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463
ISA Prompt Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463
Configuring Option 11 to Central Office (ISA) . . . . . . . . . . . . . . . . . . 465
Applicability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465
Procedure summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 466
List of terms and abbreviations . . . . . . . . . . . . . . . 479

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553-3011-311 Standard 7.0 May 1999

Page ix
Option 11C ISDN BRI Administration and Maintenance
x
About this
g
uide
This guide provides information for the ISDN Basic Rate Interface feature
for the Option 11C system. The information includes:
— An overview of ISDN Basic Rate Interface
— Feature descriptions
— Feature packaging and prerequisites
— Network clocking
— ISDN BRI line and packet data implementation
— ISDN BRI trunk implementation
— Acceptance testing
— Administration and maintenance
— ISDN BRI traffic reports

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553-3011-311 Standard 7.0 May 1999

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Option 11C ISDN BRI Administration and Maintenance
26
Chapter 1 — ISDN Basic Rate Interface
IntroductionThis chapter gives an overview of Integrated Services Digital Network
(ISDN) Basic Rate Interface (BRI).
Note: This document is intended to support the Meridian 1 Option 11
(sometimes referred to simply as the Option 11) system. (When only the
term “Meridian 1" is referenced, it is meant to include all members of the
Meridian 1 family (Meridian 1 Option 11 through Option 81C).
ISDN Overview
Integrated Services Digital Network (ISDN) is a global networking strategy
that provides an intelligent, universal network for voice and data
communications. ISDN is a set of international standards that define the next
generation of digital networking services.
Some of the benefits of ISDN are as follows:
— faster, more accurate, noise-free transmission, as well as greater security
and reliability
— ability to carry multiple information types, including speech, data,
image, and video
— standard interfaces to allow multi-vendor compatibility
— configuration flexibility when combining public and private networking
facilities.
ISDN differs from traditional communication in that it uses “out of band”
signaling. Signaling information is sent and received on a dedicated channel,
called a D-channel, leaving the remaining channels, called B-channels, free
for voice and data.

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Option 11 provides the following ISDN accesses:
— Primary Rate Interface (PRI)
• 1.5 Mb T1 (23B+D)
• 2.0 Mb E1 (30B+D)
— Basic Rate Interface (BRI)
• A single digital access connection
This document focuses on Basic Rate Interface for the Option 11. For more
information on PRI refer to 553-3011-310, 1.5 Mb DTI/PRI Administration
and Maintenance guide and 553-3011-315, 2 Mb DTI/PRI Administration
and Maintenance guide.
ISDN Basic Rate Interface
ISDN Basic Rate Interface (BRI) is a digital connection that provides three
digital channels. These channels consist of two 64 kbps Bearer channels
(B-channels) and one 16 kbps Data channel (D-channel). This 2B+D
connection is know as a Digital Subscriber Loop (DSL) on the Option 11.
The DSL can be configured for the following functionalities:
Line Access - As a line ISDN BRI provides a digital connection from the
Option 11 BRI card to an ISDN terminal that comply with CCITT, ANSI,
ETSI NET-3, INS NET-64, National ISDN, EuroISDN, 1TR6, Numeris
VN2, D70, and Asia-Pacific standards (Numeris is the French ISDN
signaling protocol; 1TR6 is the German ISDN signaling protocol; and D70 is
the Japanese ISDN signalingprotocol).Examples of terminals are: telephone
sets, FAX machines, personal computers and video display terminals.
Trunk Access - The trunk access application provides CO/DID connections
to local exchanges that support Numeris VN2, 1TR6, D70, EuroISDN, and
Asia-Pacific protocols. This application also provides ISDN BRI TIE trunk
connectivity, and QSIG ISDN BRI trunk connectivity.
Note: ISDN BRI local exchange connectivity is not supported in North
America.

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Option 11C ISDN BRI Administration and Maintenance
Packet Data transmission - The Option 11 supports both B-channel and
D-channel packet data transmission through an external DPN-100 packet
handler.
ISDN BRI allows simultaneous voice, circuit-switched data, and packet data
transmission over a single DSL.
ISDN BRI provides two interface types to the Option 11:
—S/T interface, that provides a 4-wire multi-point connection. This
interface is provided byan NT6D70 SILC linecard, which supports eight
DSLs.
—U interface, that provides a 2-wire point-to-point connection that uses
2B1Q line encoding. This interface is provided by anNT6D71 UILC line
card, which supports eight DSLs.
The following BRI functions are carried out by the NTBK22 Multi-Purpose
ISDN Signaling Processor (MISP) card on the Option 11:
— Each MISP can support up to four line cards (UILC or SILC or any
combination of the two). See Figure 1.
— The MISP executes Open System Interconnect (OSI) link and network
layer protocol. Refer to ISDN BRI protocol in this chapter for further
information.
— The MISP processes the signaling information received on the
D-Channels from DSLs. D-Channels may also carry user packet data,
which the MISP separates from signaling information and forwards to
the external DPN-100 packet handler.
— control terminal initialization and addressing
— assign B-channels for switched voice and data transmission
— send call control messages to ISDN BRI terminals over the D-channel
— supports a clock controller daughter board for BRI trunking applications

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Figure 1
ISDN BRI standard maximum configuration
ISDN BRI protocol
ISDN standards have adopted the Open System Interconnect (OSI) protocol
model to control ISDN functions. The OSI model defines seven layers
required to perform all ISDN functions from establishing an end-to-end
physical connection between two terminals to making a decision about the
type of application that is to be activated. Figure 2 shows the seven layer OSI
model. ISDN BRI hardware utilizes only the first three layers. These are:
—Physical layer (layer 1) that provides network-to-terminal physical
connections.

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Option 11C ISDN BRI Administration and Maintenance
—Data link layer (layer 2) that provides point-to-point signaling used to
establish a communication link between a terminal and its supporting
BRI interface card. It also performs error checking and error recovery.
—Network layer (layer 3) that controls terminal initialization procedures
and assigns service attributes to terminals. It also controls the call set up
and disconnect procedures.
Once these three layers are established, the functional role of ISDN BRI
hardware in the OSI protocol sequence is complete. The higher layers of the
OSI protocol are handled bythe system central processing unit (CPU) and the
system operating software.
Figure 2
OSI model
553-7663.EPS
APPLICATION
PRESENTATION
SESSION
TRANSPORT
NETWORK
(MISP/MPH)
DATA LINK
(MISP/BRSC)
PHYSICAL
(SILC/UILC)
(Layer 7)
(Layer 6)
(Layer 5)
(Layer 4)
(Layer 3)
(Layer 2)
(Layer 1)
ISDN BRI

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ISDN BRI line access
ISDNBRIlineaccessprovides2B+D ISDN serviceto terminating equipment
such as ISDN telephone sets and data terminals. ISDN BRI line connections
are configured on a per DSL basis, that is, DSL line connections may be
configured on any given DSL for any SILC or UILC.
The B-channels are automatically assigned to different voice and data
terminals in circuit-switched line applications. The D-channel is permanently
dedicated to a DSL and is used for signaling.
S/T interface
Figure 3 illustrates a typical ISDN BRI configuration showing an Option 11
with an ISDN BRI S/T interface and the terminals connected to it. ISDN BRI
terminals that comply with CCITT, ANSI (T.607), ETSI NET-3, INS
NET-64, National ISDN, EuroISDN, 1TR6, Numeris VN2, D70, and
Asia-Pacific standards can be connected as shown in Figure 3.