Nortel SONET AccessNode User Manual page 153

Procedure 7-18 (continued)
Replacing an NT7E08 DS3 mapper
Step
5
6
7
8
9
10
AccessNode Modular Business Package VTBM Ring User Guide P0904244 Issue 1.0
Replacing modules in a common-equipment shelf 7-51
Action
Switch service to the protection DS3 mapper:
manual op <group>↵
y↵
where
<group> is the group number of the DS3 mapper being replaced.
Service is switched to the protection DS3 mapper circuit pack.
CAUTION
Loss of service
Leave the DS3 mapper, that you performed a manual
protection switch on in step 5, in-service while you are
replacing it; otherwise, traffic will be lost.
Go to step 9 and begin the steps for replacing the DS1/VT mapper.
Display the equipment screen for the circuit pack to be replaced:
eq ds3 <group>↵
where
<group> is the group number of the DS3 mapper being replaced.
The DS3 equipment screen appears.
Change the state of the circuit pack to out-of-service (OOS):
chgstate oos↵
y↵
The state changes to OOS.
Remove the ABM shelf cover as shown in Chapter 3, "Removing covers and
grilles."
Pull the circuit pack ejector latches (as shown in Figure 7-15) to remove the
circuit pack from the shelf.
Note: The position of the circuit pack varies with shelf type and configuration.
—continued—