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V.25 bis Command Set Operation
Asynchronous Format
The structure of each message in the asynchronous mode (%V1 AT command) format is shown
below:
Time
OFF
OFF
Message
LF
Modem Test Modes
When optioned to operate in the synchronous V.25 bis mode, the V. 34 supports the following test
modes that can be initiated from the Front Panel:
•
Analog Loopback
•
Analog Loopback with Self-Test
•
Digital Loopback
•
Remote Digital Loopback
•
Remote Digital Loopback with Self-Test
•
End-to-End Self-Test
All tests may be terminated from the front panel switches, and the modem returns to off-line idle
command state when DTR goes from On to Off. Pending tests can be cleared only from the front
panel.
5-14
V.25 bis 108.2 Mode Interface Specifications
LF
Message
= Interface idle
= Command/Response (10-bit characters: 1 start, 7-bit ASCII data, 1even parity,
1 stop)
= ASCII Line Feed Character (00001010)
SpectraComm Dual V.34 Modem
Installation and Operation
OFF
060R122-000
Issue 15
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