View source for Need to disable V90/V92/56K modem speed

Connection failure with the [[IBM_Integrated_Bluetooth_III_with_56K_Modem_(BMDC-2)|BMDC-2]] (Conexant softK56 / HSF) and latest windows driver (7.34.00.00)

For countless attempts, the modem stayed stuck at speed negociation time, making a high pitch noise. Another, different laptop connects faster than 33600 in the exact same conditions.

Simple workaround: limit connection speed to 33600 by appending the following AT command: +MS=V34

Considering the number of similar web pages, this kind of issue seems quite common to a wide range of modem models.