Unnamed Administration sources reported that Paul H. Gusciora said:
> >> Well, I wonder who does have experience installing KX-TD with ISDN-BRI or
> >> ISDN-PRI (T1)?
> >
> >There isn't PRI support in the North American varient of the KX-TD.
Outsode of the 500's, true.
> >Since they have both BRI support and T1 support, they *ought* to be
> >able to whack in support for the PRI. But currently that is unsupported.
> >(Well, it could be in the -5 software, but I'd bet not.)
yea, dumb move.
> Hmmm. I am going to surpress comments until I read the IDSN-BRI standard to
> understand what KX-TD supports under the T1 connection, and what they do
> not support of the ISDN-BRI standard. <ignorant_thought> I guess that I
> thought of T1 of being more of a physical / link / network layer
> specification, and ISDN-BRI as more of a transport / session / presentation
> / application layer specification </ignorant_thought>.
First off; T1 is in fact a facility description. ("2 pairs copper,
repeaters every 6Kft" etc.).
In stack order, so read from the bottom up:
PRI is an APPLICATION over DS1. Another is CT1, a third is
using the whole pipe for your TCP-IP feed.
DS1 is the 1.544Mb/s standard. Backbone of the telcos
data nets.
T1 is one way of carrying DS1. Others include being
bundled in a bigger pipe, etc.
THAT SAID, 96% of the people bastardize the term "T1" to mean
"DS1..". That includes Ma. "CT1"==channelized T1 == 24 56K
"phone channels".
SO there are TWO ways of getting multiple circuits over "DS1"
a) Old (1962) dumb CT1 {24}
b) new smart PRI. {23}
BRI is a horse of a different color and size. It's one copper pair,
with two 64K B's and one 16K D {supervision}.
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