3Com 56K Command Reference Manual page 147

Register Default Function
0
1
2
Enabling local-access password protection disables the &Zn=s command (which
stores up to 10 phone numbers) because stored phone numbers occupy the same
space in NVRAM as the dialback numbers for Dial Security accounts.
S54 64 Symbol rate bit-mapped register used primarily by 3Com
Technical Support for debugging purposes.
Bit
0
1
2
3
4
5
6
7
S55 0 Trellis code bit-mapped register used primarily by 3Com
Technical Support for debugging purposes.
Bit
0
1
2
3
7
S56 0 Bit-mapped register primarily used by 3Com Technical
Support for debugging purposes.
Bit
0
1
A complete list of S-Registers
1 Dial security enabled.
2 Prompting enabled.
4 Local-access password protection
enabled.
Value Result
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 Call Indicate (CI).
128 Disable V.8.
Value Result
1 Disable 8S-2D mapping.
2 Disable 16S-4D mapping.
4 Disable 32S-2D mapping.
8 Disable 64S-4D mapping.
128 Enable phase roll detection
Value Result
1 Disable non-linear coding.
2 Disable TX level deviation.
A-11