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Optic Loopback Bench Test
Purpose:
To test the broadcast and receive capabilities of the Master unit without a Slave unit
attached.
Equipment
Requirements:
One (1) Bit Error Rate Test (BERT) Set with an appropriate interface module and
connectors.
One (1) optical jumper cable (patch cord) with appropriate connectors.
Procedure:
Set up the bench test as shown in Figure 17. Remove power, alarm, and RJ11 connectors
from the rear of the TC2400. Unscrew the two flathead screws on the TC2400's front
panel. Gently slide the unit out of the housing. Set the internal DIP switch SW3 to the
left (On) position and all others to the right position. Connect an optic patch cord from
"TxA" to "RxA." Connect a BERT tester to the RJ11 "AUX1" port on the TC2400. Set
the tester up as a DTE device. The BERT tester should indicate a "SYNC" signal.
Remove the patch cord from "TxA" and "RxA." The "SYNC" light on the tester should
turn "Off." Repeat the steps above with an optic patch cord from "TxB" to "RxB."
SW3 in the right (On) position
Figure 17. Optic Loopback Bench Test Connection Diagram
(for TC2400 only)
J1H
J1G
J1F
J1E
TC2400R/S
(Master)
ON
Internal
DIP
Switches
R41
External DIP Switches
TxB
RxA
(accessible from front panel)
- 18 -
JP7
TB1
F1
F2
U3
U4
BUZZER
R36
TxA
RxB
TC2400 & TC2401
Ring User's Manual
Rev. 1.7
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