Nortel Networks NN43001-301 - Manual (Page 90)

90 DCH installation
D-channel parameter downloading
The system software automatically downloads new parameters to each
D-channel Interface (DCHI) circuit card upon SYSLOAD. When this occurs,
the D-channel is temporarily disabled and then automatically reenabled.
Three situations require manual disabling and enabling of each DCHI to
ensure parameter downloading:
• Performing a parallel load and switching over to the second CPU
• Following an alarm condition for the T1 loop carrying the D-channel (but
the D-channel is still operational)
• Following SYSLOAD when using ISDN Signaling Link (ISL)
Remove the QPC757 DCHI
Use Procedure 4 "Remove the QPC757 DCH" (page 90) to remove the
QPC757 DCHI card from Large Systems.
CAUTION
The QPC757 DCH must be software disabled before it is hardware
disabled to prevent initialization
Procedure 4
Remove the QPC757 DCH
Step Action
1 Disable the QPC757 DCHI using LD 96, command DIS DCH x.
2 Disable asynchronous port J1 in LD 48 to prevent initialization.
3 Disable loop in LD 60.
4 If the circuit card is being removed, not replaced, remove data from
memory.
5 Determine the cabinet and shelf location of the card to be removed.
6 Set faceplate toggle switch to DISABLE.
7 Disconnect QPC757 DCHI cables.
8 Remove QPC757 DCHI card.
9 Pack and store circuit card.
—End—
Nortel Communication Server 1000
ISDN Primary Rate Interface Installation and Commissioning
NN43001-301 02.03 Standard
Release 5.5 7 December 2007
Copyright © 2003-2007, Nortel Networks
.