+FAE Automatic Data/FAX Handshake (FAX Class 1)
Type
parameter command
Value range
0,1; Default value: 0
Stored by &Wn
no
Displayed by &V
no
Values
+FAE=0 DATA/FAX discrimination disabled.
+FAE=1 DATA/FAX discrimination enabled.
Description
When the modem is configured for Class 1 operation (+FCLASS=1), the
+FAE command invokes automatic determination of data or FAX incoming calls,
and uses the DATA and FAX result codes. The +FAE command is valid for all
+FCLASS values, but affects modem behavior only when +FCLASS=1.
If +FAE=0, then incoming calls must be answered by DTE commands and
the modem does not use the FAX or DATA result codes.
If +FAE=1 and the modem answers a call, the type of calling station
may be determined by detection of calling tone or by probing during handshake.
If the calling station is a FAX machine or modem, then the answering modem
sends flag idle signal (V.21 modulation) and sends the FAX result code to
the DTE. The DTE then sends the appropriate Class 1 commands to the modem
to complete the call.
If the calling station is a data modem, the answering modem completes the
handshake, sets +FCLASS=0, sends the DATA result code to the DTE, and then
sends the normal data call result codes to the DTE to complete the call
setup.
If +FAE=1, then the silent period after an answer modem goes off
hook is 4 seconds instead of the usual 2 seconds. This allows time to detect
a FAX calling tone before sending answer tone.
+FAE is reset to value 0 when a Zn - Perform
Soft Reset or &F - Load Factory Default Profile
command is executed.
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