AT Commands Reference Manual - wireless netcontrol GmbH

Chapter 3: AT Commands Reference
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 H24 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 H24 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).
Note: Dialing a fax call is possible under two conditions, first the correct bearer service has to
be set, see +CBST command. The second condition is that the RAT has to be GSM; fax
is not supported in WCDMA RAT. In order to manually switch to GSM RAT the +COPS
command should be used. MT Fax will not be received if not registered to a GSM RAT.
The following table shows the Fax Class 1 command summary.
Command
+FCLASS
+FTS =
+FRS =
+FTM =
+FRM =
+FTH =
+FRH =
Description
Selects, reads or tests the Service Class
Stops/Pauses the transmission
Waits for silence
Transmits data with carrier
Receives data with carrier
Transmits HDLC data with carrier
Receives HDLC data with carrier
April 15, 2010 H24 - AT Commands Reference Manual 3-57