3Com 3C421600A Reference Manual page 231

Table A-7 S-Register Commands
Register Function
S53 Reserved
S54 Bitmapped.
1 = Disable 2400 symbol rate
2 = Disable 2743 symbol rate
4 = Disable 2800 symbol rate
8 = Disable 3000 symbol rate
16 = Disable 3200 symbol rate
32 = Disable 3429 symbol rate
64 = Disable V.8 Call Indicate
128 = Disable V.8 Mode
S55 Bitmapped.
1 = Disable 8S-2D trellis code
2 = Disable 16S-4D trellis code
4 = Disable 32S-2D trellis code
8 = Disable 64S-4D trellis code
16 = Reserved
32 = Reserved
64 = Reserved
128 = Reserved
S56 Bitmapped.
1 = Disable Non linear coding
2 = Disable TX level deviation
4 = Disable Pre-emphasis
8 = Disable Pre-coding
16 = Disable Shaping
32 = Disable V34+
64 = Disable V.34
128 = Reserved
S57 Reserved
S58 Reserved
S59 Reserved
S60 Reserved
S61 Short form rules
S62 Number of ANI digits
S63 Number of DNIS digits
S64 Reserved
S65 Reserved
S66 Reserved
S-Register Commands A-231