Motorola V.3400 Посібник з експлуатації - Сторінка 3

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FAX ASSOCIATED OPTIONS

A number of options can be changed without any effect on fax opera-

tion. These include items like speaker volume and pause for carrier.

Appendix E lists the AT commands and indicates how they may affect

fax operation. These commands can be incorporated by personal prefer-

ence into the initialization command. The user should compare fax

operation requirements with Appendix A 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. The user must

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 V.3400 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.

V.3400

Fax Operation

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