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Optical Loopback Test
At any time you may use a short optic cable to loopback the unit's Optic "TxA" to "RxA" or "TxB" to "RxB"
(dual optic models only). The "SYNC" LED on the front panel should light (solid) when a good optic signal
is received. This test verifies the optic transmitter's function as well as the receiver's. Upon successful
completion of this test, proceed to the Remote Loopback Test.
Remote Optic Loopback Test
1. Connect a second TC1631R/S unit. As with the first unit, follow the bench test steps on the previous
page. When you have completed the Local Loopback & Optical Loopback tests for the second unit,
proceed to the next step.
2. Remove the optical jumper cable from the local unit's "RxA" and connect it to the second unit's optic
"RxA." Add a second optical jumper cable to connect the local unit's "RxA" to the second unit's "TxA."
3. Verify that both TC1631R/S units have the same Line Code and Line Length settings.
4. On the local TC1631R/S, slide SW1-1 (Remote Loopback) to the Down (On) position. The "RMTLB"
LED will momentarily flash until it receives the remote optical signal, then it should be lit, indicating that
the unit is in RMTLB mode. (Note, other LEDs might flash for about three seconds, but will settled down
to their normal state.)
5. The "PWRA and/or PWRB," "Vcc," "Rx-A," "SYNC," "RMTRD," and "LOCRD" LEDs on the remote
TC1631R/S's front panel should be lit, as well as on the local unit.
6. Make sure the "TERM" LED on the tester is lit, and that the tester is in the "RUN" mode. The tester should
indicate a "SYNC" signal.
7. If any other LEDs illuminate or flash on the unit, make sure that all DIP switches on both of the TC1631's
are in the correct position, then reset the BERT tester. You should not see any bit errors.
8. At this point, both units tested will have passed all electrical and optical tests and will have been verified
that they are functioning properly. When done, return SW1-1 to the Up "Off" position. Proceed to the
next TC1631 unit to be tested or begin verifying other equipment and cabling in your application (if you
have not already done so).
T1/E1
BERT
Tester
Local Optic Loopback
T1/E1 Line
Interface
IN
T1/E1
BERT
Tester
OUT
Remote Optic Loopback
Local TC1631
Optic RxA
Optic TxA
IN
T1/E1 Line
Interface
Optic RxA
OUT
Optic TxA
(Optical Redundant Models Only)
Local o
ptical
loopback
Optic RxA
Optic TxA
Optic RxB
Optic TxB
(Optical redundant
models only)
Remote TC1631
Optic RxA
Optic TxA
Optic RxA
Optic TxA
- 15 -
TC1631R/S
User's Manual
Rev. 1.6
Remote Optic loopback
IN
T1/E1 Line
Interface
OUT
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