Nortel Circuit Card, Installation Manual, Page: 746 / 908

Page 746 of 906 NTAK79 2.0 Mb PRI card
553-3001-211 Standard 3.00 August 2005
Note: Clocking slips can occur between MG 1000S systems that are
clocked from different Central Offices (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 239.
IMPORTANT!
Each MG 1000S that has a digital trunk must have a clock controller
clocked to an external reference clock .
Table 239
NTAK79 LEDs (Part 1 of 3)
LED State Definition
OOS On (Red) The NTAK79 2 MB PRI circuit card is disabled or
out-of-service.
Off The NTAK79 2 MB PRI is not in a disabled state.
ACT On (Green) The NTAK79 2 MB PRI circuit card is in an active
state.
Off The NTAK79 2 MB PRI is in a disabled state. The
OOS LED will be red.