that "construction" of the T1 is directly related to the line coding
In order to support 56K on a T1, it has to be
Binary 8 Substitution/ Extended Super Frame
(B8ZS/ESF)
==> 64k clear channel
AMI/D4 (i can't remember what this stands for)
==> 56k which is fine of course for voice, but not modems ;)
-david
On Wed, 22 Aug 2001, Randy Dell wrote:
> Hi all
>
> When we Beta tested the T1 card on the td1232, we got good speed through the
> xdp's. It does however depend on the T1, turns out, sometimes the telco
> will construct them analog in the CO and use a channel bank backwards to
> send it to you digital.
> -----Original Message-----
> From: larry <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
> Date: Wednesday, August 22, 2001 1:03 AM
> Subject: Re: KX-T: modem speeds through a pbx
>
>
>
> --- "D. Duccini" <[EMAIL PROTECTED]> wrote:
>
> >> first part is correct, but once it is digital at
> the
> >> CO, it must stay that way right to (and thru) the
> ISP.
> >> ISP's run digital modem banks for 56 k operation
> with
> >> PRI lines.
>
> > no, no they don't. we, for example, use
> > channelized T1's which of course
> > stays digital the entire way
>
> the older 56k's were banked and connected via a T1 but
> everything we've used recently are all PRI. i was
> trying to say that the connection was digital all the
> way, be it BRI, PRI, T1, T3, OC etc...
>
> > and we have an older set of modems hooked into a
> > channelbank for clients
> > that have older modems or "issues" with the Ascend
> > Max 6096's we run
>
> you have server side v90's that connect to a channel
> bank fxs circuit???
> we have customers that sure could use those.
>
> >> two 56 k modems NEVER connect faster than 33.6 k
> to each other. 56 k
> >> service is asymetric, server to user can be up to
> 56 k, but user to
> >> server cannot be over 33.6 k To operate 56 k, the
> isp modem is a
> >> server side 56 k modem (not like the 56 k modem in
> your pc - but they
> >> are available in a bri version as well as pri).
>
> > bri is an ISDN thing -- modems are analog using POTS
>
> bri is a DIGITAL thing that can connect to a two port
> server side v90. and can take two calls from two v90
> user modems. and this it not an isdn b channel
> digital end-to-end. we have customers that use this
> for RAS to windows from a work at home employee using
> a v90 to their home analog phone line.
>
> > i merely pointed out the analog nature of why 56k
> > modems don't talk 56k to
>
> >> on the kxtd, there is a way to get 56 k speed.
> use bri isdn lines!
> >> the digital internal switching goes out the
> digital isdn line to the
> >> isp. no extra conversions in the way. (i have
> never seen a kxtd
> >> locally with a bri card, i think australia is the
> only place they are
> >> common.)
>
> > are you certain that the pots jack on the back of
> > the handset and the a/d
> > encoding that occurs in the KSU is good enough?
>
> David Jenkins (i hope my memory is at least close on
> the name) has bragged here serveral times about using
> xdps at 56k with his bri lines. I'm jealous!
>
> I guess I need to check the d1232 that has the T1
> card, that should pass 56k just as well from the xdp
> port. I've had so many problems there that modems on
> xdps was something I never got around to testing. The
> customer has two T1's for internet data so there was
> no reason to use xdp ports ;-)
>
> I didn't mean to be critical of your comments, thought
> the info might help those trying to use modems and the
> xdps.
>
> -larry
>
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>
>
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