Nortel Networks Circuit Card 311 - Manual (Page 924)

924 NTAK79 2.0 Mb PRI card
The NTAK79, which can be located in the main and IP expansion cabinets,
provides a 2.0 Mb PRI interface and an onboard D-channel handler (DCH)
for the Option 11C system. This circuit card also includes onboard circuitry
equivalent to the NTAK20 Clock Controller that can be manually switched
in or out of service.
The NTAK79 2 MB Primary Rate Interface (PRI) card provides a 2.0 Mb
interface and an onboard D-channel handler (DCH) for the CS 1000 system.
The NTAK79 card also includes an onboard clock controller (equivalent to
the NTAK20 Clock Controller) that can be manually switched into or out of
service.
The NTAK79 card does not support the NTBK51 downloadable D-channel
handler daughterboard.
The NTAK79 card is installed only in the Media Gateway. It is not supported
in the Media Gateway Expansion. Up to three four trunk cards are supported
in each Media Gateway. The NTAK79 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 have a clock controller clocked
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 NTAK79 uses a standard 9.5" by 12.5" multi-layer printed circuit board.
The faceplate is 7/8" wide. The NTAK79 circuit card has a total of seven
faceplate LEDs. Five of the LEDs are directly associated with the operation
of the Primary Rate interface (PRI). The remaining two LEDs are associated
with the on-board Clock Controller and the on-board D-channel interface
(DCHI). The LEDs are described in
Table 376 "NTAK79 LEDs" (page 924) .
Table 376
NTAK79 LEDs
LED State Definition
On (Red) The NTAK79 2 MB PRI circuit card is disabled or
out-of-service. OOS
Off The NTAK79 2 MB PRI is not in a disabled state.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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