[c-nsp] Re: T1 circuits over OC3

[RH List Account]

Chris, yes, that was what I was fearing.  See other message posted by me 5
minutes ago. Would love to be able to take that T1 CE and re-encapsulate it
such that I don't have to grab another T1 port for every client. That would
"suck".

OC12 is not practical out here in Bermuda - I don't think the LEC has any.

Cheers,

Rob

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Chris Boyd
Sent: Friday, October 01, 2004 11:38 AM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Re: T1 circuits over OC3

OK, going back to basics:

You have an ATM OC-3 at your location?  If so, that precludes doing 
Sonet style TDM on it, since all the payload timeslots are used for ATM 
cell transport.  You can, as others have mentioned, do CBR circuit 
emulation (CE), but you'll have to have ATM switchgear with CE 
capability in front of your router to peel the CE VCs off.

You'll also have to convince your T-1 carrier to deploy CE equipment in 
their CO to turn the T-1 loop to your customer into ATM cells.  That's 
the hard part.

You may be better off talking to your carrier to see if they can do 
something about the path that the FR-ATM PVCs take to get them better 
performance.  Or get your carrier to move you from OC-3 to OC-12 so 
that you have TDM timeslots available for T-1/DS-3 circuits.

I hope that everyone will forgive (and that mimedefang is not running) 
a small GIF attachment to help make things clearer.  If not, you can 
get it here: http://www.gizmopartners.com/ce.gif