pretty much OT: acoustic coupling
brad at heeltoe.com
Mon Mar 26 05:12:54 CDT 2007
"Jay West" wrote:
>Chuck Guzis wrote:
>>>As I understand it, that's not the way 56K works--you can hook two
>>>56K modems back-to-back on your workbench and they won't do 56K. As
>>>I understand it, on end has to interface to a digital phone line.
>>>One A/D conversion allowed. Hence, the line from you to your ISP is
>>>not "striclty" analog.
Last time I did this (we make a small box with 2000 modem modems in it),
the modems were fed from a T1/T3 with digital data.
The subscriber's data came from the CO in digital form and hit our
modems as digital data. No doubt it started as analog on their loop and
immediately got digitized (7 bits) and stuffed into a T1 where it stayed
digital until it hit us.
The modem code was highly tuned for this configuration.
>Bridge clips will also invalidate 56K connections on POTS lines.
ps: I'm not sure I believe this... if it says "may effect and possible
degrade" I'd sign up.
More information about the cctech