Modem cannot dial - "Only analog lines are supported"

Posted on 2005-05-11
Last Modified: 2013-12-27
I have a Dell Inspiron 510m laptop running WinXP Home SP2.  It comes with a Broadcom BCM V92 56K modem, drivers are version 3.5.25.

When I instruct the modem to dial, it refuses and a dialogue is displayed: "Connected phone line is not comatible with this modem.  Only analog phone lines are supported". I work with modems alot of the time, so I know the difference between Analog and Digital. I have several analog phone exchanges to test on, and it does not work on any of them (Direct line, company PABX, 2 test exchanges).

If I unplug the phone lead and make it blind dial, then it dials OK. Clearly there is something about the analog lines that makes the modem see 'digital'.

From my research, this does not seem to be a problem other users of this modem are suffering from, so I suspect the hardware may have a fault.  But I am rather hoping that that someone can suggest different drivers or a setup string that will get me round this.

Thanks for any help.
Question by:Andy_Needham
    LVL 13

    Accepted Solution

    Could it be that the modem is expecting reverse polarity? Do you have a polarity checker? For analog lines you only need to leads, try opening a phone jack and reversing the polarity. Also, maybe it is expecting a slightly different voltage? (I couldn't imagine, but maybe the modem is for a country with non-standard phone voltages? or maybe it can be reprogrammed using a utility?)

    personally, I wouldn't dwell too much on it and just get a PC-card modem :)
    LVL 1

    Author Comment

    Thanks for the suggestion.  I tried reversing the polarity with mixed results.  On one exchange the dialling worked!  On another exchange, the dialling failed, but the error dialog was not displayed.  

    So now I can be sure my modem and the drivers work, and also that reversing polarity can have strange effects!

    Many thanks for your quick assistance :-)


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