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Tests
Analog Loopback (ANALOOP)
The Analog Loopback (AL) test mode, illustrated in
the data set operation and the DTE interface. Specifically, AL tests modem modulator/demodulator
operation, DTE receive/transmit operation, and DTE interface operation. This test can be
controlled from the front panel or by AT commands. It can also be commanded by an SNMP
controller, such as the TEAM MMS (
Note
When the modem is used in \N0 , \N2 , \N3 , \N4 or \N5 modes with a fixed DTE speed, it will not issue
a CONNECT message. When the modem is used in \N1 mode, since the AL handshake speed may not
match the DTE speed selected, the modem issues a CONNECT _ _ _ _ message at the last known DTE
rate. If the DTE rate and handshake rate differ, the user can change the DTE speed to match the rate
reported by the CONNECT message.
Table 6-1
Local Test
Step
1.
To start the test, press AL for 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.
3.
Enter test data at the DTE. Compare the data that was entered at the DTE with the data that is looped
back and displayed by the DTE. If errors occur frequently, a problem may exist in the modem, the DTE,
or the DTE-to-modem connection. For fault isolation refer to
4.
To end the test, press AL switch again.
6-2
Modem Management System)
Front Panel
SpectraComm Dual V.34 Modem
Installation and Operation
Analog Loopback (ANALOOP)
Figure
6-2, is provided to isolate problems in
.
AT Command Mode
To start the test, type:
AT&T1
responds with an error message, type:
(enter), which resets the test mode, then re-enter
the command.
Figure
6-1.
To end the test, type the escape sequence (
and, after the modem is in the command mode,
type:
AT&T0
(enter).
(enter). If modem
AT&T0
)
+++
060R122-000
Issue 15
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