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Tests
Analog Loopback with Self-Test
Analog Loopback may be combined with Self-Test, as illustrated in
Self-Test, a pattern is generated by the transmitter and sent to the receiver for analysis. The pattern
is made up of alternate ones and zeros for speeds of 1200 and 2400 bps. For all other speeds the
modem generates a 511 test pattern. The number of errors is displayed on the screen. This test
provides a means for you to determine whether the problem is in the local data set.
This test is not operational when the modems are passing data at 300 bps.
Table 6-2
Analog Loopback with Self-Test
Step
1.
To start the test press AL switch, then the ST switch
for the modem you are testing (a or b).
2.
The TM LED flashes while the modem is setting up the test, then lights while the test is running. While the
test is running, the TM LED flashes each time the modem detects an error.
3.
If the timer, S-Register 18, is set to a value between 1 and 60, the test ends automatically after that value (in
10-second increments) is reached. The factory default for S-Register 18 is 000, meaning that the test
continues indefinitely.
4.
To end the test, press the AL switch again.
6-4
Front Panel
SpectraComm Dual V.34 Modem
Installation and Operation
Analog Loopback with Self-Test
Figure
6-3. Upon initiation of
AT Command Mode
To start the test, type:
AT&T8
responds with an error message, type:
(enter), which resets the test mode, then re-enter the
command.
To end the test, type the escape sequence (
after the modem is in the command mode, type:
(enter).
AT&T0
(enter). If modem
AT&T0
) and,
+++
060R122-000
Issue 15
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