Nortel Networks NN43001-301 manual Install PRI hardware

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

1Visually inspect the connector pins on the underside of the daughterboard. Straighten and realign any bent pins prior to mounting.

2Place the NTRB21 down flat on an antistatic pad.

3From 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

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