Specifications

ASM-10/8 Installation and Operation Manual Chapter 4 Diagnostics
V.54 Loopback Tests 4-3
Remote Digital Loopback (RLB)
The remote digital loopback (RLB) test checks the performance of the local and the
remote ASM-10/8 units and their connecting lines. The remote digital loopback
sets a loop at the remote ASM-10/8 unit from the DTE coupled to the local unit
(see Figure 4-2).
Local
DTE
Remote
DTE
Link
Interface
Link
Interface
Transmit
REM
Pressed
Receive
Receive
Local ASM-10/8 Remote ASM-10/8
Transmit
Data
Data
Clock
Clock
Figure 4-2. Remote Digital Loopback
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To activate the remote digital loopback:
1. Press the REM pushbutton on the local ASM-10/8 front panel.
The TEST LED on each ASM-10/8 front panel lights up. The receive output
of the remote modem is looped back to the receiver.
2. Perform the BERT test as explained above for the local analog loopback test.
If an error occurs, while the local analog loopback test described above, was
successful for both the local and remote modems, 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.