ARC DSP 9612 User's Guide download pdf (Page 29)

Installation

Page 30

Loopback Control Switch

The front panel of the modem has a push button for initiating the

following loopback diagnostic tests:

 Local analog loopback  started by pressing the button one time.

 Local digital loopback  started by pressing the button two times.

 Remote digital loopback  set the local modem’s RTS signal to

low. Then press the remote modem’s diagnostics button three

times and raise the local modem’s RTS signal to start the test. The

ALB and DLB LEDs go ON when the modem is in remote digital

loopback. This test is only available in fast-poll mode only.

Figure 2-4 illustrates these three diagnostics.

Figure 2-4. Loopback Diagnostics

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ARC DSP 9612 User's Guide Page 29