Nortel SONET AccessNode Manual page 93

Procedure 3-4 (continued)
Performing DS3 switching tests
Step
7
8
9
Manual switch
10
11
12
Action
Make sure the optical channel G1 is active and the active LED is lit.
Monitor the output of Gx circuit pack, port 3.
Make sure the DS3 traffic continuity is maintained error free.
If this requirement is not met, then verify traffic continuity for each individual
port until the defective port is found. Refer to 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 that 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 g4)
DS3 traffic transfers to mapper P and the mapper P active LED is ON. DS3
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 g4)
Traffic immediately transfers to mapper Gx and the mapper Gx active LED is
ON. The asterisk (*) is replaced by a dot (.) in the Manual switch field. DS3
continuity is maintained.
Repeat step 10 and operate a force switch on mapper Gx by entering:
↵
forced op <gx>
↵
yes
where
<gx> is the number of the working mapper (g1 to g4)
DS3 traffic remains on mapper P. DS3 traffic is error free. The user interface
protection screen indicates an asterisk (*) under the Forced switch field
(active) and a request (R) replaces the asterisk (*) in the Manual switch field.
—continued—
AccessNode Site Testing Procedures 323-3001-221 Issue 2.0
Tributary and optical tests for VTBM rings 3-31