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Fax Operation
Modem 3600 9-3
Fax Associated Options
A number of options can be changed without any effect on fax
operation. These include items like speaker volume and pause for
carrier. Appendix E lists the AT commands. These commands can be
incorporated by personal preference into the initialization command.
Compare fax operation requirements with Appendi xA and if necessary
generate an initialization command string compatible with the software
and the modem.
Stored Fax Profile
Another alternative is to develop a fax initialization command and store
it in one of the user defined profiles. Fax initialization would include the
command that recalls that profile for fax operation. Keep track of option
changes between fax transmissions and if required reset the fax profile
for the next fax transmission.
Class 1 Details
Operation as a fax modem complies with EIA-578; details of Class 1
operation and compatibility are found in that standard. There is no need
to be familiar with these details since they are handled by the Class 1
software package, but this section briefly summarizes some of them.
As a Service Class 1 facsimile DCE, the Modem 3600 provides the
basic services required to support Group 3 facsimile operation. Support
from a Class 1 facsimile DTE is required to implement the CCITT T.30
recommendations for fax document transmission and the CCITT T.4
recommendations for encoding fax images. Using software control, the
modem can:
• Connect calls
• Generate messages
• Detect waiting and silence
• Transmit and receive data
• Provide HDLC data framing, transparency, and error detection
The modem also filters data streams to and from the DTE in accordance
with the Class 1 specification.