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AC75_ATC_V01.002

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10/30/06

Confidential / Released

This chapter describes the AT commands used for fax communications. Please note that fax related commands

are not supported by Java. 

If the ME is acting as a fax modem for a PC based fax application (e.g. "WinFax") it is necessary to select the

proper Service Class (Fax Class) provided by the ME. The ME reports its Service Class capabilities, i.e. the cur-

rent setting and the range of services available. This is provided by the 

 command. 

Service Classes supported by the ME:

During an active fax connection the AT parser functionality on the used channel is limited to the AT commands

which according to the ITU V.250 and T.31 specifications are mandatory for fax communications. The functions

of these AT commands are usually supported by commonly used fax applications. 

This section describes the parameter 

 used by some of the fax-specific AT commands. To find out the

value(s) actually supported by the 

 parameter use the test commands either in on-hook or off-hook mode. 

Modulation scheme
3

V21 Ch2 - 300 bps 

24

V.27ter - 2400 bps 

48

V.27ter - 7200 bps 

72

V.29 - 7200 bps 

96

V.29 - 9600 bps 

• For 

 and 

, parameter 

 can take value 3 only, while 

 and 

 never support

Table 12.1:  Fax Result Codes

 Parameter

Service class

Reference, Standard

0

Data modem

e.g. TIA/EIA-602 or ITU V.250

1

Service Class 1

EIA/TIA-578-A

<mod>

(num)

Result Code

Meaning

+FCERROR

This facsimile error message notifies the DTE that the DCE has 

received a different signal (tone or carrier) than expected. This 

allows the DTE to recover by requesting the DCE to look for an 

alternative tone or carrier signal.