Physical description – Nortel Networks 1000 User Manual

Page 868

868

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.

ATTENTION

IMPORTANT!

Each Media Gateway that has a digital trunk must clock the clock controller to
an external reference clock.

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.

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

Figure

256 "NTBK50 2.0 Mb PRI card with daughterboards" (page 869)

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008