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Tests
End-to-End Self-Test
End-to-End Self Test, illustrated in
modem. It can be commanded only with AT commands. The commands can only be entered after
the call is established and both ends are in the data mode. The test causes each modem to generate
a pattern and to transmit it to the other modem. The modem receiving the pattern checks it for
errors. The patterns are made up of alternate ones and zeros for speeds of 1200 and 2400 bps. For
all other speeds the modems generate a 511 test pattern. The number of errors received is displayed
on the screen. The TM LED flashes at the modem receiving the error for each detected error. This
test checks the operation of both modems and the communications line.
This test is not operational when the modems are passing data at 300 bps or the modems are
configured for error correction (
Table 6-6
End-to-End Self-Test
Step
Front Panel
1.
To start the test (the modem must
be in Data Mode), press the ST
button for the modem you are
testing (a or b).
2.
Each modem flashes the TM LED while it is setting up the test, then lights the TM LED while the test is
running. The TM flashes each time an error is detected.
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 will
continue indefinitely.
4.
To end the test, press AL.
060R122-000
Issue 15
Figure
6-7, requires operators at both the local and remote
,
,
,
\n2
\n3
\n4
\n5
AT Command Mode
To start the test, (the modem must be in Data Mode), at each modem
type:
(enter). If modem responds with an error message, type:
AT&T9
(enter), which resets the test mode, then re-enter the
AT%T0
command.
To end the test, type the escape sequence
after the modem is in the command mode, type:
SpectraComm Dual V.34 Modem
Installation and Operation
End-to-End Self-Test
).
(+++
) at each modem and,
AT&T0
(enter).
6-9
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