Hello everyone troubled with their shared fax modems and
being touted $400 Brooktrout fax boards - thanks to a hint
from Jeff, I was able to solve the issue really cheap and
nice. You may take a hint and get your line tested before
you ask your client to spend money on brooktrout!
Here is a copy of the earlier posts on this subject:
Jeff - thanks for your hint. Although I did not really do
a sophisticated test with any equipment, I feel there is
some voltage issue with the phone line. I added a dumb $5
phone in parallel to the fax modem - and guess what?
Voila - the same fax modem is now receiving faxes from
machines it was rejecting earlier and it is sending them
out too! Good bye - Brooktrout!!
testers that you canQuote:>-----Original Message-----
>There are no issue in using a fax line on a line carrying
DSL unless the DSL
>is incorrectly installed. DSL is a digital signal, fax is
an analog signal.
>A DSL signal is split off of the wired pair by a splitter
and what you have
>left is an analog line pair. It's possible that the pair
>essentially the condition of reversed polarity on the
wires...this is a
>simple technician's error. Radio Shack makes polarity
pulsing 180 degrees outQuote:>plug into the outlet to test it, you could also reverse
the wires and just
>see if it works. Modems and certain telephones that use
>will fail to operate on a pair with reversed polarity
because the digital
>electronics is protected from even low power conditions
other than correct
>polarity, yet a standard analog phone may work fine on
the same pair, even
>with reversed polarity, it just means the speaker is
>> SBS2K installation using Shared Fax Service - no modem
>> sharing. Using USR Sportster 33.6 External Fax modem.
>> Subsequent to my earlier post, I did some
>> and found that the No Dial Tone error on the outbound is
>> when the modem is connected on the same line as the DSL
>> line. If I connect the modem to a regular POTS line, it
>> dials nicely.
>> I tried AT commands giving more time before dial-out,
>> but still got NO Dial Tone error. Also, tried
>> line equalizer or something like that the phone company
>> gave us. Any one knows more about how to make a modem
>> on DSL phone line?