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echo: suprafax
to: MATT DIXON
from: LOREN ASHBY
date: 1996-06-09 07:57:00
subject: Pair Gain Phone System

 MD>         Have any of you ever run your Supra modem on a 
 MD> pair gain phone line system? I just moved into an 
 MD> apartment and my modem and voice calls are all messed 
 MD> up, but the local phone provider claims everything is 
    It all depends on what type of Pair Gain they are using.  If your voice 
calls are no good, keep calling them till they fix it!  What type of problems 
are you having with the voice calls?  I ask this because as a general rule a 
"voice grade" line (which is actually what we are all using) is not 
guaranteed to work above 9600 on data (lower in some areas) but I have seen 
pair gain lines that work better with modems than an analog line at the same 
location.  It all depends on the type of pair gain and your distance from the 
Telco Central office.
 MD>         Well, I call the tech support lines and they 
 MD> said if the line was still an analog signal, instead of 
 MD> a digital signal, it should be working still.
    This can cause problems but to clear something up here...a pair gain 
system takes the analog signal, changes it to digital and multiplexes (muxes) 
the signal in the C.O.  Then there is a remote unit somewhere near you that 
de-muxes the signal and changes it back to analog.  If the timing is not 
correct that could be where you are getting the problems.
   There is really nothing YOU can do with the modem to make it work better, 
you might ask the phone company if there is any "copper" available or they 
might be able to move someone that is not on pair gain, to the pair gain and 
allow you to use their "copper pair."  This option may not be available 
because some areas have ONLY pair gain available.
Note to Moderator:  I realize this is not exactly on topic, but I am trying 
to help Matt get use out of his Supra modem.
--- Maximus/2 3.01
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* Origin: Castle Roogna 510-827-2752 (1:161/369)

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