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Optic Loopback Bench Test
Purpose:
To test the broadcast (or response) and receive capabilities of a Master or Slave unit
without any other units attached.
Equipment
Requirements:
One (1) Bit Error Rate Test (BERT) Set with appropriate interface module.
One (1) optical jumper cable (patch cord) with appropriate connectors.
Procedure:
Set up the bench test as shown in Figure 17. To test the "TxB" to "RxA" loop, connect
an optic patch cord from optic "TxB" to optic "RxA." Set the unit's internal DIP switch
SW1_2 to the Left position (to disable "RxB"). Connect a BERT tester to the DB25
connector. Set the tester up as a DTE or DCE device (the opposite of the unit's lit "DCE"
or "DTE" LED indicator). The BERT tester should indicate a "SYNC" signal.
Remove the patch cord from "TxB" and "RxA" and switch SW1_2 back to the Right
position. The "SYNC" light on the tester should turn "Off."
To test the "TxA" to "RxB" loop, repeat the steps above with an optic patch cord from
"TxA" to "RxB." Set internal DIP switch SW1_1 to the Left position (to disable "RxA").
The BERT tester should indicate a "SYNC" signal. After testing is complete, return all
switches to their normal operating positions.
Figure 17. Optic Loopback Bench Test Connection Diagram
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TC2200R/S Bus
User's Manual
Rev. 2.2
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