For most Rockwell chips:
For those with firmware versions V2.065 and V2.076 enter AT&F&C1&D2W2 and tell them get a firmware upgrade.
V.90 preferred (K56flex will still work): +MS=12,1
V.90 only, K56flex and V.34 disabled: +MS=12,1,34667,56000
K56flex preferred (V.90 will still work): +MS=56,1
K56flex only, V.90 and V.34 disabled: +MS=56,1,34000,56000
Disable V.90 and K56flex, use V.34 (28.8/33.6): +MS=11,1
For Rockwell HCF chips:
V.90 preferred (K56flex will still work) +MS=V90
K56flex preferred (V.90 will still work) +MS=K56FLEX
Disable V.90 and K56flex, use V.34 (28.8/33.6) +MS=V34
Lucent chipset modems
For modems which do not support v90 add S38=0 to the string
For Apollo (LT Win Modem) and Mars (LT PCI Win Modem) chipsets:
Enable V.90: -V90=1
Disable V.90: -V90=0
See current V90 setting with explanation: -V90? (in a terminal like hypertrm)
Enable K56flex: S38=1
Disable K56flex: S38=0
For Venus chipsets (mostly used in external modems):
K56flex only (V.90 disabled): S109=0
K56flex or V.90: S109=1
V.90 only (K56Flex disabled): S109=2
Disable K56flex and V.90 (use V.34): S38=0
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