Nortel Meridian 1 Option 11C User manual

Meridian 1
Option 11C
1.5 Mb DTI/PRI
Document Number: 553-3011-310
Document Release: Standard 13.00
Date: January 2002
Year Publish FCC TM
Copyright © 1992–2002 Nortel Networks
All Rights Reserved
PrintedinCanada
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.
SL-1 and Meridian 1 are trademarks of Nortel Networks.

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Revision history
January 2002
Standard 13.00. This global document is up-issued for Release 25.40.
December 2000
Standard 12.00. This global document is up-issued to include updates and
changes required for Option 11C IP Expansion field trials with Release 25.3x
software.
April 2000
Standard 11.00. This is a global document and is up-issued for X11 Release
25.0x. Document changes include removal of: redundant content; references
to equipment types except Options 11C, 51C, 61C, and 81C; and references
to previous software releases.
May 1999
Issue 10.00, Standard, published for Generic X11 Release 24.0x.
October 1997
Issue 9.00, Standard, published for Generic X11 Release 23.0x.
September 1996
Issue 8.00, Standard, published for Generic X11 Release 22.0x.
November 1995
Issue 7.00, Standard, published for Generic X11 Release 21.1x
July 1995
Issue 6.00, Standard, published for Generic X11 Release 21.0x
December 1994
Issue 5.00, Standard, published for Generic X11 Release 20.0x.

Page 4 of 100 Revision History
553-3011-310 Standard 13.00 January 2002
July 1994
Issue 4.00, Standard, published for Generic X11 Release 19.0x.
February 1994
Issue 3.00, Standard, published for Generic X11 Release 18.0x.
January 1993
Issue 2.00, Standard, published for Generic X11 Release 17.0x.
April 1992
Issue 1.00, Standard, published for Generic X11 Release 16.0x.

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6
Contents
About this guide . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
PRI Implementation . . . . . . . . . . . . . . . . . . . . . . . . . 9
DTI Implementation . . . . . . . . . . . . . . . . . . . . . . . . . 37
DTI/PRI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . 47
ISL Implementation . . . . . . . . . . . . . . . . . . . . . . . . . 79
ISL Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

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553-3011-310 Standard 13.00 January 2002

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8
About this guide
This document contains specific information on how to configure ISDN
DTI/PRI on Meridian 1 Option 11C systems. For general information, and for
information on software features, refer to Networking Features and Services
(553-2901-301).
This document is a global document. Contact your system supplier or your
Nortel Networks representative to verify that the hardware and software
described is supported in your area.

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553-3011-310 Standard 13.00 January 2002

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36
PRI Implementation
Contents
This section contains information on the following topics:
Reference list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Hardware Requirements . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Circuit cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Channel Service Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
NTRB21 TMDI card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
NTAK09 DTI/PRI circuit card . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
NTAK20 Clock Controller (CC) daughterboard . . . . . . . . . . . . . . . . . . 15
Shelf slot assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Clocking modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Clock controller LED states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
NTAK93 D-channel Handler Interface (DCHI) daughterboard . . . . . . 17
NTBK51BA Downloadable D-channel daughterboard . . . . . . . . . . . . . 18
Install PRI hardware . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Insert/remove the NTRB21 TMDI card . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mount the NTAK20 daughterboard on the NTRB21 . .. . . . . . . . . . . . . 20
Mount the NTAK93 or NTBK51 daughterboard on the NTAK09 . . . . 21
Remove the daughterboards from the NTAK09 . . . . . . . . . . . . . . . . . . 24

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553-3011-310 Standard 13.00 January 2002
Set the switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Insert the NTAK09 into the main cabinet . . . . . . . . . . . . . . . . . . . . . . . . 25
Connect the cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Install IP daughterboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Software enable the DTI/PRI cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Software enable the NTRB21 TMDI card . . . . . . . . . . . . . . . . . . . . . . . . 26
Software enable the NTAK09 card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Program Basic PRI . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Program procedure . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Reference list
The following are the references in this section:
•Networking Features and Services (553-2901-301)
•Administration (553-3001-311)
•Option 11C and 11C Mini Technical Reference Guide (553-3011-100)
•Option 11C Planning and Installation (553-3021-210)
Overview
Digital trunks are now supported in both Main Option 11C cabinets and IP
Expansion cabinets. This increased capability is possible with the
introduction of IP daughterboards in expansion cabinets and 100baseT or F
connectivity with the Main cabinet.
This chapter provides the information required to install PRI on a Meridian 1
Option 11C system:
• hardware and software installation
• programming procedures for basic call service.
While either the hardware or software may be installed first, the PRI cannot
be enabled and tested until both are completed.

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Option 11C 1.5 Mb DTI/PRI
Hardware Requirements
Circuit cards
To implement PRI on the Meridian 1 Option 11C, the hardware shown in
Table 1 on page 11 is required.
Cables
The following cables are required for PRI connections:
• PRI to external T1 cable
• NTBK04 carrier cable
• NT8D97 50 foot extension (if needed)
Channel Service Units
When connecting the DTI/PRI to the public network, CSUs are required by
most operating companies. One CSU is required per PRI. Suitable CSUs
which support 64 Kbps clear and Bipolar 8 Zero Substitution (B8ZS) are
available from vendors such as Verilink, Digitalink, Kentrox and Tellabs.
Table 1
Required Circuit Cards
Circuit card Description
NTRB21 DTI/PRI TMDI card.
NTAK09 DTI/PRI circuit card.
NTAK20 Clock-controller daughterboard. Option 11C
supports only one active clock controller per
system or IP Expansion cabinet.
Note: Every cabinet that contains a digital
trunk must contain a clock controller.
NTAK93 D-channel-handler interface (DCH)
daughterboard.
NTBK51BA Downloadable D-channel daughterboard
(DDCH). Connects to the NTAK09 DTI/PRI
card.

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553-3011-310 Standard 13.00 January 2002
Note: Contact your Nortel Networks Sales representative for specific
local CSU requirements.
Hardware description
NTRB21 TMDI card
The NTRB21 TMDI card provides 1.5 MBit/s Digital Trunk Interface or
Primary Rate Interface functionality on the Option 11C. The NTRB21 has a
built-in downloadable D-channel which may occupy any single card slot
(1-9), in the Option 11C main cabinet. In IP Expansion cabinets, the card may
be placed in slots 11-19, 21-29, 31-39 or 41-49 of the first, second, third and
fourth expansion cabinets, respectively.
Note 1: For CISPR B group cabinets, the active Clock Controller
(NTAK20) can only occupy slots 1-3, 11-13, 21-23, 31-33, or 41-43 in
an Option 11C cabinet. For FCC and/or CISPR A group cabinets, this
limitation does not exist.
Note 2: The NTRB21can be equipped together with the NTAK09
DTI/PRI card (with the NTBK51 downloadable D-channel
daughterboard), and the NTAK93 DCHI daughterboard.
Figure 1 on page 13 shows a faceplate of the NTRB21 TMDI card.

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Option 11C 1.5 Mb DTI/PRI
Figure 1
NTRB21 TMDI card faceplate
TMDI
Rx
Tx
OOS
ACT
RED
YEL
LBK
CC
DCH
....
....
....
....
....
....
....
....
....
....
....
....
....
....
....
....
MAINT
RS232 Monitor Port

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553-3011-310 Standard 13.00 January 2002
NTAK09 DTI/PRI circuit card
The NTAK09 Digital Trunk Interface/Primary Rate Interface (DTI/PRI) card
provides the physical interface for the DS-1 facility T-1 carrier on the
Meridian 1 Option 11C. It is required for PRI and DTI operation and is also
used for ISL shared-mode applications.
The DTI/PRI card occupies any single card slot (1-9) in the Option 11C main
cabinet. On IP Expansion cabinets, it may be placed in slots 11-19, 21-29,
31-39, 41-49 of the first, second, third, and fourth expansion cabinets,
respectively. Figure 2 shows the faceplate layout, the location of the switch
and the position of the daughterboards and connectors. See “DTI/PRI
Maintenance” on page 47 in this guide for information about the faceplate
LEDs.
Figure 2
NTAK09 DTI/PRI circuit card
DIS
ACT
RED
YEL
LBK
CC
DCH
RCV
XMT
NTAK09
1.5 MB
DTI/PRI
ON
1234
DCH F/W
LEN 0
LEN 1
Len 2
SW
ON
1 2 3 4
DCH F/W LEN 0 LEN 1 Len 2
553-8294.EPS
SW
Stiffeners
Connector
Sockets
LEDs
Bantam
Jacks
Standoffs
Switch

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NTAK20 Clock Controller (CC) daughterboard
Digital Trunking requires synchronized clocking so that a shift in one clock
source will result in an equivalent shift of the same size and direction in all
parts of the network. On Option 11C systems, synchronization is
accomplished with the NTAK20 clock controller circuit card in each Main
and IP Expansion cabinet.
The Clock Controller circuitry synchronizes the Option 11C to an external
reference clock, and generates and distributes the clock to the system. Option
11C can function either as a slave to an external clock or as a clocking master.
The NTAK20AA version of the clock controller meets AT&T Stratum 3 and
Bell Canada Node Category D specifications. The NTAK20BA version
meets CCITT stratum 4 specifications.
Shelf slot assignment
On non-CISPR B system cabinets, the NTAK20 may be placed in slots 1-9 of
the Main cabinet. On cabinets NTAK11Dx and NTAK11Fx, the active
NTAK20 must be placed in slots 1-3 (slots 4-10 may not be used.)
On non-CISPR B IP Expansion cabinets, the NTAK20 may be placed in slots
11-19, 21-29, 31-39, 41-49 of the first, second, third, and fourth expansion
cabinets, respectively.
Clocking modes
The Option 11C system supports a single clock controller that can operate in
one of two modes: tracking or non-tracking (also known as free-run).
IMPORTANT
Every cabinet that contains a digital trunk must contain a clock
controller. If a system is equipped with digital trunks, it is
recommended that at least one digital trunk be placed in the main
cabinet. If there is a mixture of TMDI and non-TMDI in the same
cabinet, place the clock controller on the non-TMDI card.

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Tracking mode
In tracking mode, one or possibly two DTI/PRI cards supply a clock reference
to a clock controller daughterboard. When operating in tracking mode, one
DTI/PRI is defined as the primary reference source for clock synchronization,
while the other is defined as the secondary reference source (PREF and SREF
in LD 73).
There are two stages to clock controller tracking:
• tracking a reference, and
• locked onto a reference.
When tracking a reference, the clock controller uses an algorithm to match its
frequency to the frequency of the incoming clock. When the frequencies are
very near to being matched, the clock controller is locked onto the reference.
The clock controller will make small adjustments to its own frequency until
both the incoming and system frequencies correspond.
If the incoming clock reference is stable, the internal clock controller will
track it, lock onto it, and match frequencies exactly. Occasionally, however,
environmental circumstances will cause the external or internal clocks to
drift. When this happens, the internal clock controller will briefly enter the
tracking stage. The green LED will flash momentarily until the clock
controller is locked onto the reference once again.
If the incoming reference is unstable, the internal clock controller will
continuously be in the tracking stage, with the LED flashing green all the
time. This condition does not present a problem, rather, it shows that the clock
controller is continually attempting to lock onto the signal. If slips are
occurring, however, it means that there is a problem with the clock controller
or the incoming line.
Free-run (non-tracking)
In free-run mode, the clock controller does not synchronize on any source, it
provides its own internal clock to the system. This mode can be used when
the Meridian 1 is used as a master clock source for other systems in the
network. Free-run mode is undesirable if the Meridian 1 is intended to be a
slave. It can occur, however, when both the primary and secondary clock
sources are lost due to hardware faults or when invoked by using software
commands.

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Clock controller LED states
The clock controller LED, on the NTAK09 or NTRB21 faceplates, will be in
various states, depending on the status of the clock controller:
NTAK93 D-channel Handler Interface (DCHI) daughterboard
The NTAK93 DCHI daughterboard interfaces with the Option 11C Central
Processing Unit (CPU) and mounts on the NTAK09 DTI/PRI circuit card for
PRI or ISL shared mode applications. The DCHI is responsible for
performing the Q.921 layer 2 protocol information. It transfers layer 3
signaling information between two adjacent network switches.
The NTAK93 DCH daughterboard, when installed on the NTAK09 circuit
card, is addressed in the same slot as the NTAK09. The NTAK93 can use SDI
I/O addresses 0 to 79 and port 1.
Note: I/O addresses 0, 1, 2, 8 and 9 are preconfigured on the Option 11C
and must not conflict with the I/O addresses on the NTAK93 card.
Table 2
Clock Controller LEDs
LED Clock controller
On (Red) NTAK20 is equipped and disabled.
On (Green) NTAK20 is equipped and is either locked to a
reference or is in free run mode.
Flashing
(Green)
NTAK20 is equipped and is attempting to lock (tracking
mode) to a reference. If the LED flashes continuously
over an extended period of time, check the CC STAT in
LD60. If the CC is tracking this may be an acceptable
state. Check for slips and related clock controller error
conditions. If none exist, then this state is acceptable,
and the flashing is identifying jitter on the reference.
Off NTAK20 is not equipped.

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A minimum of one NTAK93 is required for each PRI link. If more than one
PRI link is connected to the same end location, a single DCHI circuit card can
support up to a maximum of eight PRI connections for the Option 11C
system. This allows a total of 190 B-channels or PRI trunks to be supported
if a backup D-channel is also used. A total of 191 B-channels or PRI trunks
are supported if a backup channel is not used.
NTBK51BA Downloadable D-channel daughterboard
The NTBK51BA DDCH daughterboard interfaces with the Option 11C
Central Processing Unit (CPU) and mounts on the NTAK09 DTI/PRI circuit
card for PRI D-channel applications. The DDCH is equivalent to the MSDL
card used on the larger Meridian 1 systems, but it only supports D-channel
applications (no SDI or ESDI).
The NTBK51BA DDCH daughterboard, when installed on the NTAK09
circuit card, is addressed in the same slot as the NTAK09.
A minimum of one NTBK51BA is required for each PRI link. If more than
one PRI link is connected to the same end location, a single DDCH circuit
card can support up to a maximum of eight PRI connections for the Option
11C system. This allows a total of 190 B-channels or PRI trunks to be
supported if a backup D-channel is also used. A total of 191 B-channels or
PRI trunks are supported if a backup channel is not used.
For more information on expansion daughterboards, refer to Option 11C and
11C Mini Technical Reference Guide (553-3011-100).
Install PRI hardware
Insert/remove the NTRB21 TMDI card
Insert the NTRB21
Insert the NTRB21 TMDI circuit card into card slot 1-9 in the Main cabinet,
or in slots 11-19, 21-29, 31-39, 41-49 of the first, second, third, and fourth
Expansion cabinets, respectively. Check for available card slots in the base
cabinet and print the configuration record to determine which slots may be
used. To do this, use PRT CFN in LD 22. Then, use the following steps:

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Option 11C 1.5 Mb DTI/PRI
1If in PRI mode, first S/W disable the associated D-channel using the
following overlay and commands:
LD 96 DIS DCH x
(Where x is the DCH port number that was assigned in LD 17).
2If the Clock Controller is enabled, first S/W disable it using the following
overlay and commands:
LD 60 DIS CC 0
3Hold the NTRB21 by the lock latch, unlock the latch and slide the card
into the cabinet.
4Enable the TMDI card using the following overlay and commands:
LD 96 ENL TMDI x
where x is the NTRB21 TMDI card number (DLOP). The card number
associated with a NTRB21 TMDI card is based on the slot in which the
card is installed.
Within about 30 seconds, the D-channel layer 3 should be established. To
confirm, request the current status of the D-channel by using the LD 60
command STAT DCH (N).
The system should respond DCH N EST OPER, meaning that the D-channel
is established and operational.
Remove the NTRB21
1If in PRI mode, first S/W disable the associated D-channel using the
following overlay and commands:
LD 96 DIS DCH x
(Where x is the DCH port number that was assigned in LD 17).
2If the Clock Controller is enabled, first S/W disable it using the following
overlay and commands:
LD 60 DIS CC 0

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553-3011-310 Standard 13.00 January 2002
3Disable the NTRB21 TMDI card using the following overlay and
commands:
LD 96 DIS TMDI x
where x is the NTRB21 TMDI card number (DLOP). The card number
associated with a NTRB21 TMDI card is based on the slot in which the
card is installed.
4Hold the NTRB21 by the lock latch, unlock the latch and slide the card
out from the cabinet.
Mount the NTAK20 daughterboard on the NTRB21
Mount the NTAK20 daughterboard on the NTRB21. Work on a flat surface
when mounting or removing daughterboards.
1Visually inspect the connector pins on the underside of the
daughterboard. Any pins that are bent should be re-aligned prior to
mounting.
2Place the NTRB21 down flat on an anti-static pad.
3From an overhead viewpoint, with the daughterboard parallel above the
NTRB21 and the connector pins aligned over the connector sockets, line
up the mounting holes on the daughterboard (Figure 3) with the tops of
the standoffs on the NTRB21.
4Slowly lower the daughterboard towards the NTRB21, keeping the
standoffs in line with all four holes, until the holes are resting on the tops
of the four standoffs.
If more than a very slight amount of pressure is required at this point, the
connector pins may not be aligned with the connector socket. If so, lift
the daughterboard off the NTRB21 and return to step 2.
5Gently apply pressure along the edge of the board where the connector is
located until the standoffs at the two corners adjacent to the connector
snap into a locked position. Then press down on the two corners on the
opposite side until they also are locked into place.