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Install PRI hardware 203
This allows a total of 382 B-channels or PRI trunks to be supported if a
backup D-channel is also used. A total of 383 B-channels or PRI trunks are
supported if a backup channel is not used.
NTBK51BA Downloadable D-channel (DDCH) daughterboard
The NTBK51BA DDCH daughterboard interfaces with the Small System
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 a Large System, 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 connects to the same end location, a single DDCH circuit
card can support up to a maximum of sixteen PRI connections for the
Small Systems. This allows a total of 382 B-channels or PRI trunks to be
supported if a backup D-channel is also used. A total of 383 B-channels or
PRI trunks are supported if a backup channel is not used.
For more information on expansion daughterboards, refer to Communication
Server 1000M and Meridian 1 Small System Planning and Engineering
(NN43011-220).
Install PRI hardware
Install/remove daughterboard on the NTRB21 TMDI card
Work on a flat surface when mounting or removing daughterboards.
Procedure 24
Mounting the NTAK20 daughterboard on the NTRB21
Step Action
1
Visually inspect the connector pins on the underside of the
daughterboard. Straighten and realign any bent pins prior to
mounting.
2
Place the NTRB21 down flat on an antistatic pad.
3
From an overhead view, 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 78
"NTAK20 daughterboard installation on the NTRB21" (page 204))
with the tops of the standoffs on the NTRB21.
Nortel Communication Server 1000
ISDN Primary Rate Interface Installation and Commissioning
NN43001-301 02.03 Standard
Release 5.5 7 December 2007
Copyright © 2003-2007, Nortel Networks
.