RAD Data comm ASMi-31 - Manual (Page 35)

ASMi-31 Installation and Operation Manual Chapter 4. Tests and Diagnostics
24-01-00 19:17 Diagnostic Tests 4-3
Remote Loopback
(RLB) This test determines the performance of both the local and the remote
ASMi-31 modems, as well their connecting 2-wire line between them. The
test activates a diagnostic loopback at the remote ASMi-31 modem (see
Figure 4-2).
Local
DTE
Remote
DTE
Link
Interface
Link
Interface
Transmit Receive
Receive
Local ASMi-31 Remote ASMi-31
Transmit
Data
Data
Clock
Clock
Figure 4-2 Remote Digital Loopback
➤ ➤ ➤ ➤ To activate the Remote Digital Loopback:
•
Activate the Remote Loopback via the DTE interface.
The TEST LED lights on both units.
Set the DTE equipment in half duplex (which produces an "echo" through
the system), or run a Bit Error Rate test.
Perform the test at both ends. If the BER test indicates a fault and if the LLB
test was successful for both local and remote modems, then the 2-wire line
circuits inside the modem are not operating properly, or the line connection
between the modems is faulty.
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