User Guide

Chapter 3 – Fax Class 2 Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 88
Format conversion, +FFC
Class 2.0/2.1
Write syntax: +FFC=<vrc>,<dfc>,<lnc>,<wdc>
Valid values: see table below
Default values: manufacturer’s option
Mandatory values: 0,0,0,0
This compound parameter determines the modem response to mismatches between
the Phase C data delivered after the +FDT command and the data format parameters
negotiated for the facsimile session. For mismatch checking, the modem depends on
the host to indicate the data format with embedded <DLE><format> character pairs.
If these format indicators are not provided, the modem shall assume that the format
is as negotiated for that session.
For each subparameter, value 0 determines that mismatch checking is disabled, and
all format codes of this type are ignored. Value 1 determines that mismatch checking
is enabled, with session termination if the format codes do not match the negotiated
format reported in +FCS: responses. Other values enable degrees of format
conversion. Unspecified values are reserved.
Class 2 Not Applicable
Note that the four arguments of the Class 2.0/2.1 command +FFC cover the same
technical content as these four separate Class 2 commands (which are described in
detail below):
+FVRFC (for vertical resolution),
+FDFFC (for data compression format version),
+FLNFC (for page length format conversion), and
+FWDFC (for page width format conversion).
Setting Description
vrc=0
vrc=1
vrc=2
vrc=3
Vertical resolution format codes ignored
Vertical resolution checking enabled
Vertical resolution conversion enabled for 1-D data
Vertical resolution conversion enabled for 2-D data
dfc=0
dfc=1
dfc=2
Data format codes ignored
Data format checking enabled
Data format conversion enabled
lnc=0
lnc=1
lnc=2
lnc=3
Page length format codes ignored
Page length checking enabled
Page length conversion enabled for 1-D data
Page length conversion enabled for 2-D data
wdc=0
wdc=1
wdc=2
Page width format codes ignored
Page width checking enabled
Page width conversion enabled