Comtrol AT Command Set Rev A - Manual (Page 190)

AT Commands Reference Manual
Conexant 100722B
5-18
5.5 Service Class 2 Parameters
All Service Class 2 parameters can be read, written, and tested for range of legal values
by the DCE. The general syntax is described in Section 6.1.
Group 3 FAX devices negotiate session parameters in DIS, DCS, and DTC frames. The
following parameters are provided to condition the facsimile DCE for the capabilities it
will offer and to report the session settings negotiated.
The three primary T.30 session parameters are +FDCC, +FDIS and +FDCS. They are
compound parameters, using values listed in Table 5-2. Figure 5-1 illustrates their
relationships.
Figure 5-1. T.30 Session Parameter Relationships
5.5.1 +FDCC - DCE Capabilities Parameters
Write syntax: +FDCC=VR,BR,WD,LN,DF,ED,BF,ST
Valid values: See Table 5-2.
Default values: 0,3,0,2,0,0,0,0 (9600 bps fax models) or 0,5,0,2,0,0,0,0 (14400 bps fax
models)
+FDCC allows the DTE to sense and constrain the capabilities of the facsimile DCE from
the choices defined in CCITT T.30 Table 2. When +FDCC is modified by the DTE, the
DCE copies +FDCC into +FDIS.