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Examples
at&fs38=0s109=0 This will disable all 56K connections
at&fs38=1s109=1s37=14 This will disable V.90 connections. The modem
will try to connect at K56flex rates with the V.34
upstream rate limited to 21.6K bps.
at&fs38=1s109=2 This will cause the modem to attempt a V.90
connection only. If V.90 is not achieved, it will
fall back to V.34 rates.
at&fs38=10s109=2 This will cause the modem to attempt a V.90
connection at 40K bps. It will fall back to slower
speeds if it cannot achieve or maintain this rate.
As a suggested “init string” in your communications program, use:
at&fw2s109=2s38=1s37=14
S38 = 7 36000 bits / s
S38 = 8 37333 bits / s
S38 = 9 38666 bits / s
S38 = 10 40000 bits / s
S38 = 12 42666 bits / s
S38 = 13 44000 bits / s
S38 = 14 45333 bits / s
S38 = 15 46666 bits / s
S38 = 16 48000 bits / s
S38 = 17 49333 bits / s
S38 = 18 50666 bits / s
S38 = 19 52000 bits / s
S38 = 20 53333 bits / s
S109 (default: 1) K56flex and V.90 Selection
S109 = 0 Disable all 56K connections
S109 = 1 K56flex only, V.90 disabled (default)
S109 = 2 V.90 only. K56flex disabled