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ISS 3, NECA 365-407-301
CHANGE-2
4.09
The following are operational procedures for RLB switch:
•NOTE 1:
Channel is out-of-service when remote loopback is performed.
NOTE 2:
When Group OA02/0B02 is used as the MUX unit, the ON direction of
RLB switch is reversed to that of Group OAOO.
3-7 A. t
Refer to Fig.
(1)
Set ALM unit MAINT switch to ON position.
MAINT LED is lit.
(2)
Set the
MUX
unit RLB switch to ON for corresponding channel.
MUX unit RLB
SET LED and remote DMUX unit RLB DET LED are lit. (DMUX unit detects RLB
command.) See Figure 4-1.
(3)
Verify that the signal is looped back and perform signalling test.
(4)
Set
MUX
unit RLB switch to OFF. RLB SET LED and RLB DET LED go out.
(5)
Repeat steps 2 through 4 for remaining channels.
(6)
Set MAINT switch to OFF. MAINT LED goes out.
D.
High Speed Remote Loopback
4.10
The 6M OPT INF unit RLB switch provides high speed level (6.312 Mb/s)
remote loopback circuitry between stations. This partitions the optical
transmission line between the opposite stations. Refer to Figure 4-2. Remote
loopback is used for installation testing.
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