Replacing The Ntak79 Or Ntbk50 2.0 Mbit Pri Card - Nortel 1000E Maintenance Manual

Page 128 of 162

Replacing the NTAK79 or NTBK50 2.0 Mbit PRI card

553-3041-500 Standard 1.00
Replacing equipment
To replace the NTAK79 or NTBK50 2.0 Mbit PRI card, follow the steps in
Procedure 14.
Procedure 14
Replacing the NTAK79 or NTBK50 2.0 Mbit PRI card
1 If the card is an NTAK79, or is an NTBK50 with the NTAK93 DCHI
daughterboard attached, disable the associated D-channel using the
following overlay and commands:
LD 96 DIS DCH X
If the card is an NTBK50 with the NTBK51 DDCH daughterboard
attached, disable the associated downloadable D-channel using the
following overlay and commands:
LD 96 DIS DCH X
LD 96 DIS MSDL X
2 Disable the Clock Controller using these commands:
LD 60 DIS CC 0
3 Disable the PRI pack using these commands:
LD 60 DIS L X
Note: The LEDs on the front of the card change from green (enabled) to
red (disabled.) In order for this to happen, the DIS MSDL command must
be used, as in step 1.
4 Hold the circuit card by the lock latches, unlock the latches, and slide the
circuit card out of the Media Gateway. If required, remove any
daughterboards which can be attached. See Procedure 15 on
5 On the replacement PRI circuit card, set any switches and install any
daughterboards as required. Hold the card by the lock latches and slide it
into its assigned slot until it connects with the backplane.
6 Enable the Clock Controller and the PRI in their corresponding overlays:
LD 60 ENL CC 0
LD 60 ENLL X
The associated DCHI/DDCH will automatically enable.
September 2004
page 129.