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Chapter 3 - AT Commands, S-Registers and Result Codes
Register Unit Range Default Description
S37
decimal 0–19 0 Sets the maximum V.34 “upstream” speed at
which the modem attempts to connect.
0 = maximum modem speed
1 = reserved
2 = 1200/75 bps
3 = 300 bps
4 = reserved
5 = 1200 bps
6 = 2400 bps
7 = 4800 bps
8 = 7200 bps
9 = 9600 bps
10 = 12000 bps
11 = 14400 bps
12 = 16800 bps
13 = 19200 bps
14 = 21600 bps
15 = 24000 bps
16 = 26400 bps
17 = 28800 bps
18 = 31200 bps
19 = 33600 bps
S38
decimal 0–23 1 Sets “downstream” data rate where K56flex
provides rates of 32,000 to 56,000 in 2,000
bps increments, V.90 provides rates of 28,000
to 56,000 bps in increments of 1,333 bps.
0 = V.90 disabled
1 = V.90 autorate K56flex rates
2 = 28,000 bps 2 = 32,000 bps
3 = 29,333 bps 3 = 34,000 bps
4 = 30,666 bps 4 = 36,000 bps
5 = 32,000 bps 5 = 38,000 bps
6 = 33,333 bps 6 = 40,000 bps
7 = 34,666 bps 7 = 42,000 bps
8 = 36,000 bps 8 = 44,000 bps
9 = 37,333 bps 9 = 46,000 bps
10 = 38,666 bps 10 = 48,000 bps
11 = 40,000 bps 11 = 50,000 bps
12 = 41,333 bps 12 = 52,000 bps
13 = 42,666 bps 13 = 54,000 bps
14 = 44,000 bps 14 = 56,000 bps
15 = 45,333 bps
16 = 46,666 bps
17 = 48,000 bps
18 = 49,333 bps
19 = 50,666 bps
20 = 52,000 bps
21 = 53,333 bps
22 = 54,666 bps
23 = 56,000 bps
Upstream data rates
The upstream V.90 data rate are 4800 to
33,600 bps in 2400 bps increments.
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