mailing list archives
Re: Terminating many T1's
From: "Neil J. McRae" <neil () domino org>
Date: Wed, 23 Jul 1997 12:09:37 +0100
On Tue, 22 Jul 1997 22:07:01 -0400 (EDT)
Brian Horvitz <horvitz () websecure net> wrote:
Actually, up in Boston, MFS derives all their pricing by taking the Nynex
end-to-end price and subtracting a certain percentage (at least 10%). I
may be mistaken but, I think they still do this even with the DS3 Hub.
You still pay two chan terms. A Nynex chan term is about $200 so this
ends up being quite an expense. The overall savings still makes it worth
while if you are going to sell a lot of T1s - if only for the headache,
you only need two aspirin at the end of the day instead of four.
The solution to this is for someone to make a Channelised SONET/SDH interface.
[I know more on SDH so I'll talk about that] SDH is a multiplexing technolodgy
and with SDH I could have one pair of fibres from an SDH MUX to my
Ascend/Cisco/BAY box that had upto 60 E1 [2048 lines] on it using a
virtual container. VC-12 for 2048K and VC-11 for 1544K [T1].
With this one could have around 100 T1's. The Telco could do the
routeing via Cross-connect and even deliver this service using SDH, one
would could also have this on looped SDH and 99% of the fiber breaks
that we see currently would simply go away. You could also pull
these circuits into standard E1/T1 muxes and make 30 64K channels on an
E1. The other great thing about this is that SDH and SONET are really easy
SDH and SONET are multiplexing technolodgies and I wish the router
manufacturers would wake up and grab this idea.
I'm currently using ATM->FR mapping to do this with the Ascend GRF which
works reasonably well, apart from ATM ofcourse :-). We're putting lots
of pressure on our suppliers to make the above happen. Ascend have a
SONET card [with protection] for the GRF so things are going in the
Neil J. McRae. Alive and Kicking. Domino: In the glow of the night.
neil () DOMINO ORG NetBSD/sparc: 100% SpF (Solaris protection Factor)
Free the daemon in your <A HREF="http://www.NetBSD.ORG/">computer!</A>
Re: Terminating many T1's David Mercer (Jul 23)