Thank you for that, your message underlines many of the points I made
in a previous message I sent to the list, I've since read blerb from
my phone company where they specifically state that data and fax
performance may be impaired if you connect the data or fax device to
the voice side of your ADSL filter and they advise customers against
doing same and suggest that they consider a dedicated phone line for
data and faxing applications away from your ADSL broad-band service,
they go on to say that such additional data services may include
security systems where the system has to frequently keep in touch
with a monitoring station etc.
Ok, that could be dismissed as plain and simple "sales talk" but what
I've experienced thus far would tend to support the claims of my
telephone company. Yes, I can fax from the voice side of my ADSL
filter but faxing is quite a bit slower than it otherwise would be if
I faxed from a dedicated line, I've tested this out and again, I have
technical data from my fax test number provided by my local telephone
company to verify that what I say is true.
I also point out that for all of my faxing requirements to date, I've
been using a fax machine capable of speeds up to 33.6KBPS and the
internal modem of my Ibook is only caapable of speeds up to 14.4KBPS
so the faster speeds of my other fax device may use those frequencies
that Travis illuded to in his message, that is frequencies close to
the ADSL range used so 14.4KBPS faxing may not be such a problem.
Now as a final twist to this discussion (or my part of it at any
rate) there are many different types of ADSL filters around so who's
to say that one kind may be better than another? There has been much
discussion on this point in our local computer columsn which appear
weekly in one of our local newspapers.
At 11:45 15/05/2006 -0400, Travis Siegel said:
This is interesting.
I'm assuming you're using verizon's service, where they only send a
filter device that you plug into your existing phone line to provide
voice/dsl capabilities on the same line.
This shouldn't be a problem, as voice and dsl signals are at
different frequencies, which is how they do the separation of voice/
dsl signal.
However, my guess is (and I've not confirmed this) that when you try
to fax, the fax signal is sufficiently close to the dsl signal that
the dsl signal interferes with the fax signal. This of course isn't
a problem if you have a dedicated dsl line (as *should* be the case,
but since phone companies are always looking for shortcuts, sometimes
you get stuck with substandard service, and thus the filters you plug
into your line.
But in any case, I'm interested in finding out more about this.
Anybody else have adsl via their voice line and can test the faxing
thing? I've never heard of this before, and I'd like to verify this.
It's something I'd like to use against my local telco when trying to
get them to install a dsl line for me. They've been telling me for
nearly 6 years I couldn't get dsl in here, and I just found out this
weekend the neighbor has it, so now it's time for me to go raise some
hell, and I don't want one of these filtered systems, I want a *real*
dsl connection on it's own pair of wires, and this sort of info is
exactly what I need to make this happen. If anyone can confirm this
faxing problem, I'd be greateful.
Thanks much.
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