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TC1540D User's Manual
Rev. 1.2
Figure 18. Remote Loopback Bench Test Connection Diagram
Remote Loopback Bench Test
Purpose:
This test loops the composite optical & electrical signal at the remote unit back to the local
unit (via fiber) in order to test each unit's optic functions and LED indicators and to verify
the integrity of the fiber optic link.
Equipment
Requirements:
One (1) Bit Error Rate Test (BERT) Set with appropriate interface module.
At least two (2) optical jumper cables (patch cords) with appropriate connectors.
Procedure:
Set up the bench test as shown in Figure 16. On the remote unit, set
SW2
(RMTLB)
to the Right position and connect a BERT tester to the local unit. Set the tester up as
a DTE device (refer Fig. 15 for DTE device connection). The "TD" and "xD" LEDs (on
both TC1540 units) should light, indicating the status of the looped signal. The BERT
tester should indicate a "SYNC" signal. This test can be performed from either (or both)
direction(s).
TC1540
TC1540
RxD
TxD
RxD
TxD
Set Sw5 to right
Set SW3 to left
(Remote loopback)
Optic Cable
RS-232
BERT
or
ASCII Terminal
