r6781-12 Conexant Systems, Inc., r6781-12 Datasheet - Page 67

• Manufacturer Part Number: r6781-12
• Description: Embedded Modem Family
• Manufacturer: Conexant Systems, Inc.

EmbeddedModem Family
6.2.1 Fax Mode Selection
6.2.2 Fax Mode Processing
6.2.3 Fax Origination
6.2.4 Fax Answering
D224ATLVDSC
6.2 Fax Modes
Fax modes and rates are determined by the AT+F commands and are defined in
Chapter 4.0, AT
Fax modem processing is explicitly defined in CCITT V .29, CCITT V .27 ter, and
CCITT V .21 recommendations. All modulation, waveform spectrum, and data
processing functions conform to the appropriate specifications with the following
exceptions:
Automatic origination of fax call is supported by the ATDS command. Upon
completion of the dial function, a calling tone at 1100 Hz (± 38 Hz) with an ON
duration of 0.5 seconds (± 75 ms) and OFF duration of 3 seconds (± 450 ms) is
transmitted.
Answering of fax calls is identical to answering of data calls, with the exception
that the DCE enters the fax handshaking mode instead of the data handshaking
mode after going off-hook.
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V .29 receive functions are not supported.
V .29 4800 bps is not supported; V .27 ter 4800 bps is used instead.
V .29 half-duplex continuous carrier mode only is supported.
V .29 channel multiplexer option is not supported.
V .27 ter 75-baud backward channel option is not supported.
V .27 ter short train mode is not supported.
Commands.
Conexant
6.2 Fax Modes
6-3