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TC2100 DM
User's Manual
Ver. 1.6
MNL-21000-01-16
Local Electrical Loopback Bench Test
(not applicable for RS-485)
Purpose:
To verify the DB25's cable connections, the electrical interface driver, and the receiver's
Integrated Circuitry.
Equipment
Requirements:
One (1) Bit Error Rate Test (BERT) Set with an appropriate interface module.
Procedure:
Set up the bench test as shown in Figure 17. Set ESW2 (front panel) to the down (On)
position and the Alarm LED should start flashing. Set the BERT tester up as a DTE
device
(set the tester up as a DCE device if the TC2100 was factory configured as
a DTE)
. The "BRD-1" & "BRD-2" and "RSP-1" & "RSP-2" LEDs should be dimly lit,
showing the status of the looped signal. The Bert tester should indicate a "SYNC" signal.
This test can be performed on each unit individually throughout the system.
Figure 17. Local Electrical Loopback Bench Test Connection Diagram
