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Procedure 7-7 (continued)
Replacing an NT4K52 processor card
Step
3
4
5
6
7
8
AccessNode Modular Business Package VTBM Ring User Guide P0904244 Issue 1.0
Replacing modules in a common-equipment shelf 7-15
Action
CAUTION
Possible loss of service
DS1 and DS3 protection switching is unavailable during a
switch of activity (SWACT) of the processor cards. If a
DS1/VT mapper or a DS3 mapper fails while a SWACT is
in progress, traffic cannot be switched to the protection
mapper. Protection switching is available (after the
SWACT) when the user is prompted to log in to the
network element.
Switch activity to the standby (redundant) processor:
switch↵
y↵
Note 1: During a processor card SWACT, the green active LED on working
DS1/VT mappers and DS3 mappers goes out for approximately 20 seconds.
The DS1 and DS3 mappers are fully functional during this 20 second interval
and there is no loss of DS1/DS3 traffic.
Note 2: You must wait 7 minutes before performing another protection switch
on the same processor cards.
Log back in to the network element user interface.
Skip to step 6.
From the network element status screen, display the screen for the standby
processor:
eq proc < group >↵
where
< group >
group number of the standby processors: a or b
The processor equipment screen appears.
To prevent alarms from being raised when the circuit pack is removed,
change the state of the processor:
chgstate oos↵
y↵
The state changes to out-of-service (OOS).
Remove the ABM shelf cover as shown in Chapter 3, "Removing covers and
grilles."
Pull the circuit pack ejector latches to remove the processor card from the
shelf.
—continued—
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