Ascend Archive
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Re: (ASCEND)56K


Well.. I agree that PRI's can go a bit faster than CT1's on modem
connections but with my Livingston Portmaster 3 I've gotten quite a few
good, solid 50k connections and even 52k and 54k over trunk-side CT1's from
US West (ESF/B8ZS/E&M imediate start)...:)

On Fri, Nov 28, 1997 at 01:16:54PM -0500, Tech Support wrote:
> Greg Hale wrote:
> 
> >A channel in a T1 circuit is 64kb but 8 kb of this is
> >used for signalling so you really don't have use of the full channel.  With
> >a PRI trunk you have a full 64kb to play with because the signalling is
> done
> >out of band in the D channel.  This difference in 8kb would explain the
> >differences that people receive in maximum rates.  50000 for a PRI, 42000
> >for a channelized T1.  Therefore, if the T1 trunks are setup correctly you
> >will be able to use 56flex but your max will top out about 42000, maybe
> >44000 in rare instances.
> 
> >Going to PRI would give you the 50000 to 52000's
> >that others are talking about.  Unfortunately, I cannot do PRI with my
> >DMS-10 yet so much of this is derived from what I've heard others say about
> >their connect speeds and circuits.  If anyone has gotten connect speeds
> >above 42-44k on channelized T1 I would love to know how and what switch the
> >telco is serving these maxes with.
> ==================================================
> 
> You're right on target. We use a DMS10, but have a POP set up in a location
> served by a DMS100, so we use T1PRI there. The highest connect speed I've
> seen on the 10 was 42000, and it was very unreliable. The usual is 40000.
> 
> We just upgraded to the generic release that allows ISDN BRI, and I've been
> told that the PRI feature will be available around July-Sept of 98. That's
> gonna be nice, although I still would like to vent my spleen at USR and
> Rockwell for pushing a technology that is flakey at best.
> 
> Tom Gwilt <tomgwilt@suite224.net> <support@suite224.net>
> Internet Services Director
> Suite 224 Internet - a division of the Conneaut Telephone Company
> 
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-- 
 - Steve
  - Systems Manager
  - Community Internet Access, Inc.
  - Gallup and Grants, New Mexico
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