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COMSPHERE 3900 Series Modems
3-48 November 1996 3910-A2-GN32-30
NOTE
For tributary modems only, the test is delayed 30 seconds to allow
any outstanding network management messages to propagate
upstream before the VF channel is interrupted by the test.
If
the modem passes the self-test,
Pass appears on the LCD. If it fails, Failed appears. If the
modem fails, contact your service representative. If Invalid Command
appears on the LCD, the
modem is operating on dial lines or another test is in progress. If another test is in progress, select
Abort to clear the current test and try again. If the modem is operating on dial lines, disconnect to
clear the dial lines, and then choose Self. If the modem receives a ring signal during this test, the
test is canceled and the
RI Abort
message appears.
To exit this function and remain in the T
est branch, press the
key
. To exit and return to the
Top-Level menu, press the
key
.
Loc Analog Loop
Loc Analog Loop performs a local analog loopback (CCITT V.54 Loop 3), Figure 3-4, that verifies
modem operation as well as the connection between the DTE and modem. The modem must be
offline and in Synchronous or Asynchronous Direct mode to perform this test, otherwise Invalid
Command appears.
Figure 3-4. Local Analog Loopback
To access Loc Analog Loop from the T
est branch, make the following selections:
F1
Test:
Loc_Analog_Loop
F2
F3
Press the
key until Loc_Analog_Loop appears. Press any function key to start this test.