Installation
Loopback Control Switch
The front panel of the modem has a push button for initiating the following loopback diagnostic tests:
cLocal analog loopback started by pressing the button one time.
cLocal digital loopback started by pressing the button two times.
cRemote 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 2-6 illustrates these three diagnostics.
Figure 2-6. Loopback Diagnostics
Page 28
