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AT Commands Affecting ITU-T V.90 Operation
There are 3 S-registers which support K56flex, V.90, and V.34 connections. The
S37 register is used to control the upstream V.34 rate. S38 sets the maximum
downstream speed that the modem attempts to connect. To disable V.90, set S38
to 0. Use the S109 register to select between K56flex and V.90 protocols.
Use the S109 register to disable 56K connections or to choose between K56flex
and V.90 protocols. The default setting (S109=1) will attempt K56flex and then
V.34 depending upon the central site modem being called and your phone line
conditions.
S37 (default: 0) Upstream (V.34) Rate
S37 = 0 maximum modem speed (default)
S37 = 1 reserved
S37 = 2 1200 bits/s and 75 bits/s
S37 = 3 300 bits/s
S37 = 4 reserved
S37 = 5 1200 bits/s
S37 = 6 2400 bits/s
S37 = 7 4800 bits/s
S37 = 8 7200 bits/s
S37 = 9 9600 bits/s
S37 = 10 12000 bits/s
S37 = 11 14400 bits/s
S37 = 12 16800 bits/s
S37 = 13 19200 bits/s
S37 = 14 21600 bits/s
S37 = 15 24000 bits/s
S37 = 16 26400 bits/s
S37 = 17 28800 bits/s
S37 = 18 31200 bits/s
S37 = 19 33600 bits/s
S38 (default: 1) 56K Dial Line Rate
S38 = 0 Disable all 56K connections
S38 = 1 autorate - maximum achievable connection (default)
S38 = 2 29333 bits / s
S38 = 3 30666 bits / s
S38 = 4 32000 bits / s
S38 = 5 33333 bits / s
S38 = 6 34666 bits / s