- 22 -
TC2100 DM
User's Manual
Ver. 1.6
MNL-21000-01-16
Remote Loopback Bench Test
(not applicable for RS-485)
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.
At least one (1) small copper jumper wire (optional).
Procedure:
Set up the bench test as shown in Figure 19. Using a small jumper wire, short pin 2 to
pin 3 (for an RS-232 interface) at Slave 1's DB25 connector (or switch ESW1 “RMTLB”
to the down position). Set the tester up as a DTE device
(set the tester up as a DCE
device if the TC2100 was factory configured as a DTE)
. 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.
Figure 19. Remote Loopback Bench Test Connection Diagram
