Why is my fax so slow?

Posted on 2011-10-29
Last Modified: 2012-05-12
When I send a fax using my fax modem, it seems to be transmitted very slowly.   When I use my Canon MX870, the transmission goes much faster.   The same phone line is used for both.   Why is there such a difference?
Question by:DoctorK12008
    LVL 10

    Expert Comment

    Most likely the scan engine.  Your fax can only scan @ 200 or 300DPI so its scan engine doesn't have to be very fast, your canon probably doubles as a scanner / copy thus has an engine that is built to provide higher res scans say 1200 or even 2400 DPI so when it scans at the standard fax of I believe 200 dpi it is able to scan much faster into its buffer.  You should notice if this is the case of the page being fed faster on the canon than on the fax.

    Author Comment

    The fax is sent from the fax modem after the scan has completed, so the scan speed is not a factor.   It is the actual transmission of the fax that is the problem.   I also frequently get an error message in Windows Fax & Scan, to say the fax could not be sent due to an unexpected error, or some such wording.   This never happens with the Canon MX 870.
    LVL 82

    Expert Comment

    by:Dave Baldwin
    The Canon probably has a better fax modem.  Several years ago I switched all my PC modems to ones that use a Rockwell / Conexant chip set because those worked best when connecting to HP fax and all-in-one machines.  USR seems to work well also.  Some of the others don't work so well.
    LVL 22

    Expert Comment

    I find faxmodems have more 'incompatibility' with fax machines compared to fax machine - to - fax machine transfers.

    What speed is your faxmodem set to?  try increasing the baud rate
    also, what DPI is it set for in your fax software.  I use GFI Faxmaker and I have 2 choices, 100x200 dpi or 200x200 dpi

    Author Comment

    I can send a fax by just printing a document to the Canon Fax printer.   I still have to compose a cover page if I do this.   Is there a specific model of fax modem that works well with Windows 7 Professional 64-bit?   The modem I have currently installed is a Trendnet TFM-PCIV92A.
    LVL 22

    Accepted Solution

    for 64bit I use a MultiTech modem, but they are on the expensive side.  I use these for businesses with Faxmaker.  Normally I use FaxCard (more $$ but better results and multi-line), but for a small company then the MultiTech modems.

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