3Com 56K Command Reference Manual page 190

I-8 A I: S-R
PPENDIX EGISTERS
Register Default Function
S56 0 Bit-mapped register primarily used by 3Com Technical
Support for debugging purposes.
Bit
0
1
2
3
4
5
6
7
S58 0 Bit-mapped register primarily used by 3Com Technical
Support for debugging purposes.
Bit
0
1
2
3
4
5
6
7
S70 0 Bit-mapped register primarily used by 3Com Technical
Support for debugging purposes.
Bit
0
1
2
3
4
5
6
7
Value Result
1 Disable non-linear coding.
2 Disable TX level deviation.
4 Disable preemphasis.
8 Disable precoding.
16 Disable shaping.
32 Disable V.34+.
64 Disable V.34.
128 Disable V.FC.
Value Result
1 Disable x2.
2 Reserved.
4 Reserved.
8 Reserved.
16 Reserved.
32 Disable V.90.
64 Reserved.
128 Reserved.
Value Result
1 Enable ring type A.
2 Enable ring type B.
4 Enable ring type C.
8 Enable ring type D.
16 Reserved.
32 Reserved.
64 Reserved.
128 Reserved.