Ricoh FACSIMILE FAX77 Field Service Manual page 48

Byte number 2
Bit 0 - DIS detection
0: First
1: Second (first DIS is ignored)
Bit 1 - ECM transmission 0: Disabled 1: Enabled
Bits 2 to 4 - Not used
Bits 5 and 6 - Compression methods available, and priority
Bit 6 5 Methods
0 0 MH/MR; MR priority
0 1 MH/MR; MR priority
1 0 MH only
1 1 Not used
Bit 7 - Short preamble
0: Disabled 1: Enabled
Byte number 3
CCITl T1 time, in seconds, divided by 2.56.
2-17