Resource Center

Modem Initialization Strings:

What's a modem initialization string?

A modem initialization string is a bunch of commands that gets sent to your modem before the modem dials. It's possible to type these commands by hand every time you want to dial in, but that would get annoying after a while. When you use an initialization string, you just type these commands into the appropriate spot once -- and then every time you make a modem connection, the commands get sent automatically before the modem dials.

The important thing about modem init strings is that having the right one often makes the difference between connecting and not. Init strings are fairly specific to each modem. The string that made your friend's modem fly may not work at all for your modem.

Not all programs use simple init strings. Some use settings files, such as Windows 95 .inf files, Mac CCL modem scripts, etc.

Why might I need a modem initialization string?

If you often lose a connection in the middle, or if your modem dials but does not connect with the answering modem, you might need to adjust your initialization string.

KFlex

Lucent Apollo/ Mars chipset modem inits (i.e. LT WinModem / LT PCI WinModem)

-V90=1 :Enables V.90 on a modem.

-V90=0 :Disables V.90 on a modem.

Lucent Venus chipset modem inits (i.e. early ISA/External & PCMCIA modems)

S109=0 :Enables KFlex and disables V.90 on a modem.

S109=1 :Enables both KFlex and V.90 but prefers KFlex on a modem.

S109=2 :Disables KFlex and enables V.90 on a modem.

PCTel 56k HSP chipset modem inits

S37=0 :Enables V.90 on a modem.

S37=12 :Disables V.90 on a modem.

N1 :Enables the modem to automatically select which protocol it will use.

N0 :Disables the modems ability to automatically select which protocol it will use.

%E2 :Enables the modem to automatically renigotiate the connect and fallback to v.34, KFlex, or V.90.

%E0: Disable the modem to automatically renigotiate the connect and fallback to V.34, KFlex, or V.90.

Rockwell chipset modem inits

+MS=11,0 :Enables V.34 and disables KFlex and V.90 on a modem.

+MS=12,1 :Enables KFlex and V.90 but prefers V.90 on a modem.

+MS=12,1,34667,56000 :Disables V.34, KFlex and enables V.90 on a modem.

+MS=56,1 :Enables both KFlex and V.90 but prefers V.90 on a modem.

+MS=56,1,34000,56000 :Disables V.34, V.90 and enables KFlex on a modem.

Rockwell HCF chipset modem inits

+MS=V34 :Enables V.34 and disables KFlex and V.90 on a modem.

+MS=K56FLEX :Disables V.34, V.90 and enables KFlex on a modem.

+MS=V90 :Disables V.34, KFlex and enables V.90 on a modem.

Cirrus Logic chipset modem inits

+MS=V34 :Enables V.34 and disables X2, V.90 on a modem.

+MS=VX2: Disables V.34, V90 and enables X2 on a modem.

+MS=V90 :Disables V.34, X2 and enables V.90 on a modem.

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The Cyber Image / Mobile Tech Support, Inc.
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