RAD Data comm ASMi-31 operation manual Remote Loopback, To activate the Remote Digital Loopback

ASMi-31Installation and Operation Manual		Chapter 4. Tests and Diagnostics
Remote Loopback	This test determines the performance of both the local and the remote
(RLB)	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

Data
Clock	Transmit
	Link
	Interface
Clock	Receive
Data
	Local ASMi-31

Receive

Link

Interface

Transmit

Remote ASMi-31

Remote

DTE

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.

Diagnostic Tests 4-3

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