Nortel Networks NN43001-301 - Manual (Page 203)

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
.