Nortel SONET AccessNode Manual page 86

3-24 Tributary and optical tests for VTBM rings
Procedure 3-3 (continued)
Performing DS1 switching tests
Step
7
8
9
Manual and forced switch
10
11
AccessNode Vol 3B 323-3001-221 Issue 2.0
Action
Make sure the active LEDs on both G1 and G2 are lit. Ring protection works
on a channel basis and not on a circuit pack basis: channels 1 to 6 are for
traffic and channels 7 to 12 are for protection.
Monitor the output of Gx circuit pack, port 14.
Make sure the DS1 traffic continuity is maintained error free.
If this requirement is not met, then verify traffic continuity of each port
individually until the defective port is found. To correct the problem, see Alarm
and Trouble Clearing Procedures , 323-3001-543, in Maintenance , Volume
5A.
Note: Switching can cause a 60-ms hit. This hit occurs when you initiate the
switch and when you release the switch. After the switch is performed, the
traffic stabilizes and should be error free.
Operate a manual switch on mapper Gx by entering:
↵
manual op <gx>
↵
yes
where
<gx> is the number of the working mapper (g1 to g12)
DS1 traffic transfers to mapper P and the mapper P active LED is ON.
DS1 traffic is error free.
The user interface protection screen indicates an asterisk (*) under the
Manual switch field (active).
Release the manual switch by entering:
↵
manual re <gx>
↵
yes
where
<gx> is the number of the working mapper (g1 to g12)
Traffic transfers immediately to mapper Gx and the mapper Gx active LED is
ON.
The asterisk (*) is replaced by a dot (.) in the Manual switch field.
DS1 continuity is maintained.
—continued—