Note:
EREF and MREF commands in LD 60, which control the enabling and disabling of automatic
clock recovery, are not supported on the system.
Replacing equipment
Use the following procedure before reseating any one or more of the following: the NTAK09,
the NTAK20, or the NTAK93.
1. If the NTAK93 DCHI daughterboard is installed, enter the following command in LD
96 to software disable the D-channel (DCHI):
DIS DCH x
X is the DCHI port number that was assigned in LD17.
2. If the NTAK20 Clock Controller daughterboard is installed, enter the following
command in LD 60 to software disable it:
DIS CC 0
CC is the card slot number of the NTAK09 that supported the NTAK20 Clock
Controller.
3. Enter the following command in LD 60 to software disable the DTI/PRI card:
DISL X
X is the card slot number of the NTAK09 DTI/PRI.
4. To replace the NTAK09 by the lock latches, unlock the latches and slide the card
out of the cabinet. Once out of the slot you can remove any of the
daughterboards.
Note:
T
o avoid damage to the circuit cards from electrostatic discharge, wear the wrist
strap connected to the inside of your cabinet when you handle the circuit cards.
Figure 26: Wrist strap connection to the cabinet on page 122
shows the
connection point for the wrist strap.
DTI/PRI maintenance tools
ISDN Primary Rate Interface Maintenance November 2011 121
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