Physical Description - Nortel Circuit Card 311 Reference

968 NTBK50 2.0 Mb PRI card
daughterboard provides identical performance to the on-board NTAK79
DCHI. The NTBK51 DDCH daughterboard provides support for protocols
based on the MSDL platform.
The NTBK50 2.0 Mb PRI card provides a 2 Mb PRI interface for the CS
1000. The NTBK50 card sups the NTAK20 clock controller daughterboard
and either the NTAK93 D-channel interface or the NTBK51 Downloadable
D-channel handler. The NTAK93 DCHI daughterboard provides identical
performance to the on-board NTAK79 DCHI. The NTBK51 DDCH
daughterboard provides support for protocols based on the MSDL platform.
The NTBK50 is installed only in the Media Gateway. It is not supported in
the Media Gateway Expansion. Up to four digital trunk cards are supported
in each Media Gateway. The NTBK50 card can be installed in slots 1, 2, 3,
and 4 of the Media Gateway.
IMPORTANT!
Each Media Gateway that has a digital trunk must clock the clock controller to
an external reference clock.

Physical description

The NTBK50 uses a standard 9.5" by 12.5" multi-layer printed circuit board.
The faceplate is 7/8" wide and contains seven LEDs. See
"NTBK50 2.0 Mb PRI card with daughterboards" (page
Copyright © 2003-2008, Nortel Networks
.
Note: Clocking slips can occur between systems that are clocked from
different COs, if the COs are not synchronized. The slips can degrade
voice quality.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
ATTENTION
Figure 280
969).