IBM 33L4618, Installation Instruction

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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. S38
sets the maximum downstream speed that the modem attempts to connect. To
disable V.90, set S38 to 0. The S37 register is used to control the upstream V.34
rate. Use the S109 register to select between K56flex and V.90 protocols.
S37 Dial Line Rate (default 0)
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 56K Dial Line Rate (default 1)
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
S38 = 7 36000 bits / s
S38 = 8 37333 bits / s
S38 = 9 38666 bits / s
S38 = 10 40000 bits / s
S38 = 11 41333 bits / s