RC224ATL/224ATLV
6.0 Operation
EmbeddedModem Family
6.2 Fax Modes
6.2 Fax Modes
6.2.1 Fax Mode Selection
Fax modes and rates are determined by the AT+F commands and are defined in
Chapter 4.0, AT Commands.
6.2.2 Fax Mode Processing
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:
1. V.29 receive functions are not supported.
2. V.29 4800 bps is not supported; V.27 ter 4800 bps is used instead.
3. V.29 half-duplex continuous carrier mode only is supported.
4. V.29 channel multiplexer option is not supported.
5. V.27 ter 75-baud backward channel option is not supported.
6. V.27 ter short train mode is not supported.
6.2.3 Fax Origination
6.2.4 Fax Answering
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.
D224ATLVDSC
Conexant
6-3
CONEXANT [ CONEXANT SYSTEMS, INC ]
