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Local Electrical Loopback Bench Test
Purpose:
To verify the electrical 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 and
connectors.
Procedure:
Set up the bench test as shown in Figure 16. Set SW2 to the down (On) position. Set
the BERT tester up as a DTE device. 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 16. Local Electrical Loopback Bench Test Connection Diagram
J1H
J1G
J1F
J1E
TC2400R/S
-or-
TC2401R/S
ON
Internal
DIP
Switches
R41
External DIP Switches
TxB
RxA
(accessible from front panel)
SW2 in the down (On) position
- 17 -
JP7
TB1
F1
F2
U3
U4
BUZZER
R36
TxA
RxB
TC2400 & TC2401
Ring User's Manual
Rev. 1.7
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