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Need to disable V90/V92/56K modem speed
From ThinkWiki
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Connection failure with the BMDC-2 (Conexant softK56 / HSF) and latest windows driver (7.34.00.00)
For countless attempts, the modem stayed stuck at speed negotiation 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.
