AT Commands Reference
228 98-08901C68-O
4.14 FAX CLASS 1
Facsimile machines were developed for sending digitized documents over the General Switched Telephone Network (GSTN)
These facsimile terminals are in widespread use around the world. The operation of facsimile terminals has been standardized
in Recommendations T.4, T.6 and T.30. The cellular network also supports the facsimile service within the cellular network and
also with the GSTN network. The g20 is configured as an external "facsimile DCE", connected to the terminal by a standard
serial port (for example, Recommendation V.24), using serial data interchange. The g20 supports Fax Class 1, with a few
exceptions, marked as "Not supported" in the table below. The SW flow control is mandatory (using the DC1/ DC3 characters).
(ITU - T.31section 5.3)
The following table shows the Fax Class 1 command summary.
Table 114. Fax Class 1 Command Summary
Command Description g20 Support
+FCLASS Selects, reads or tests the Service Class (Note 1) Supported
+FTS = <Time> Stops/Pauses the transmission Supported
+FRS = <Time> Waits for silence Supported
+FTM = <MOD> Transmits data with <MOD> carrier Supported
+FRM = <MOD> Receives data with <MOD> carrier Supported
+FTH = <MOD> Transmits HDLC data with <MOD> carrier Supported
+FRH = <MOD> Receives HDLC data with <MOD> carrier Supported
+FAR = <off/on> Adaptive reception control Not supported
+FCL = <time> Carrier loss timeout Not supported
+FDD = <value> Double escape character replacement control Not supported
+FIT = <time>, <action> Terminal inactivity timeout Not supported
+GMI? Reports manufacturer ID Supported (refer to “+CGMI,
+GMI, +FMI, Request
Manufacturer ID” on page 39)
+GMM? Reports model ID Supported (refer to “+CGMM,
+GMM, +FMM, Request Model
ID” on page 40)
+GMR? Reports revision ID Supported (refer to “+CGMR,
+GMR, +FMR, Request
Revision” on page 41)
+IPR Local terminal-g20 serial port rate Supported (refer to “+IPR, Local
DTE-DCE Serial Port Rate” on
page 151)
+IFC Local terminal-g20 flow control Supported