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Local Electrical Loopback Bench Test
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 appropriate interface module.
Procedure:
Set up the bench test as shown in Figure 18. Set SW2_2 ("LOCLB" on the front panel)
to the Down position and the "ALARM" LED should start flashing. Set the tester up as
a DTE or DCE device (the opposite of the unit's lit "DCE" or "DTE" LED indicator). 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
should be performed on each individual unit in the application.
Figure 18. Local Electrical Loopback Bench Test Connection Diagram
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TC2200R/S Bus
User's Manual
Rev. 2.2
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