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Remote Loopback Bench Test
Purpose:
To test the Slave unit's optic functions and LED indicators. This procedure also enables
the operator to become familiar with the self-healing function. When installing new
Slave units in a network, a remote loopback test should be performed between each
individual Slave and the Master unit. This will verify the integrity of the system.
Equipment
Requirements:
One (1) Bit Error Rate Test (BERT) Set with an appropriate interface module.
At least six (6) optical jumper cables with appropriate connectors.
Procedure:
Set up the bench test as shown in Figure 18. Switch SW1 ("RMTLB") to the down
position at Slave 1. Set the tester up as a DTE device. The BERT tester (connected
to the Master) should indicate a "SYNC" signal.
Verify the self-healing function by disconnecting the fiber at optic "TxA" on Slave 1,
creating an optic fault condition. The BERT tester's "SYNC" light may turn "Off"
momentarily, then turn "On", indicating the fault was detected and the transmission
was rerouted to the alternate ring. Verify the LEDs and reconnect the fiber. Repeat this
step for optics "RxA," "TxB," and "RxB" on each of the remaining units to be tested.
J1H
J1G
J1F
J1E
TC2401R/S
(Slave 1)
ON
Internal
DIP
Switches
R41
External DIP Switches
TxB
RxA
(accessible from front panel)
SW1 in the
down (On) position
Figure 18. Remote Loopback Bench Test Connection Diagram
J1H
J1G
J1F
JP7
T B 1
F1
F2
TC2400R/S
U3
U4
O N
Internal
DIP
Switches
BUZZER
R36
R41
TxA
RxB
TxB
J1E
JP7
TB1
F1
F2
(Master)
U 3
U 4
BUZZER
R36
External DIP Switches
RxA
(accessible from front panel)
TxA
RxB
- 19 -
TC2400 & TC2401
Ring User's Manual
Rev. 1.7
J1H
J1G
J1F
J 1 E
J P 7
TB1
TC2401R/S
(Slave 2)
U3
U4
O N
Internal
DIP
Switches
BUZZER
R41
R36
External DIP Switches
TxB
R x A
(accessible from front panel)
TxA
RxB
F 1
F 2
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