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Chapter 3 – Fax Class 2 Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 76
Label Function Class 2.0/2.1 Class 2 Description
JP JPEG for
color and
B&W
(Note 2)
00
01
02
04
08
10
20
40
Disable JPEG coding
Enable JPEG coding (T.81)
Full color mode
Enable preferred Huffman tables (Note 3)
12 bits/pel/component
No subsampling (1:1:1)
Custom illuminant
Custom gamut range
Notes:
1 For subparameter VR, values 00, 01, 02, 04, 08, 10, 20 and 40 (hexadecimal) indicate a single choice; they are the only values
allowed in the +FCS parameter and +FCS: report. All values that are sums of these values shall only be used to indicate multiple
capabilities; these are allowed in +FIS and +FCC parameters. For example, value 07 (01 + 02 + 04) would indicate capability for
all metric-based resolutions.
2 For subparameter JP, values 00, 01, 02, 04 08, 10, 20 and 40 (hexadecimal) indicate a single choice. All values that are sums of
these values shall only be used to indicate multiple capabilities in +FIS and +FCC subparameters and to indicate the choice in
the +FCS subparameter. For example, to indicate support for JPEG, full color mode ,and no subsampling, the host should set the
JP subparameter to 01 + 02 + 10 = 13h. If one or several of the values 02h to 40h are not used, that means that the default value
for the subparameter (e.g. respectively: gray-scale, custom Huffman tables, 8 bit/pel/component, 4:1:1 subsampling ratio, D50
illuminant, default gamut range) is used, as defined in Annex E/T.30 and Annex G/T.4.
3 The modem ignores this value in •FCC and in •FIS when generating DIS or DTC frames.