RAD Data comm FOM-40 Specifications download pdf (Page 37)

FOM-40 Installation and Operation Manual Chapter 5 Troubleshooting and Diagnostics

Loopback Tests 5-3

Remote Digital Loopback (RLB)

The remote digital loopback (RLB) test checks the performance of the local and the

remote FOM-40 units and their connecting lines. The remote digital loopback sets

a loop at the remote FOM-40 unit from the DTE connected to the local unit

(see Figure 5-2).

Local

DTE

Remote

DTE

Link

Interface

Link

Interface

Transmit

REM

Pressed

Receive

Local FOM-40 Remote FOM-40

Transmit

Data

Clock

Figure 5-2. Remote Digital Loopback



To activate the remote digital loopback:

1. Press the REM pushbutton on the local FOM-40 front panel.

The TEST LED on each FOM-40 front panel lights up. The receive output

of the remote modem is looped back to the transmitter.

2. Perform the BER test as explained above for the local analog loopback test.

If the local analog loopback test described above was successful for both the

local and remote modems, and an error occurs during the BER test, the line or

the line circuits of the local or the remote unit are not operating properly.

3. After completing the test or correcting the fault, press REM pushbutton again

to restore it to the OFF position.

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RAD Data comm FOM-40 Specifications Page 37