[1103] in North American Network Operators' Group
RE: Links on the blink - reprise
daemon@ATHENA.MIT.EDU (Jeffrey P. Oliveto)
Sun Nov 19 09:36:09 1995
From: "Jeffrey P. Oliveto" <joliveto@cwi.net>
To: "'Paul Ferguson'" <pferguso@cisco.com>,
"'smd@sprint.net'"
<smd@sprint.net>
Cc: "'cook@cookreport.com'" <cook@cookreport.com>,
"'nanog@merit.edu'"
<nanog@merit.edu>
Date: Sun, 19 Nov 1995 09:17:31 -0500
Paul;
You state:
At 05:47 PM 11/17/95 -0500, Sean Doran wrote:
=20
>
>There are substantial disadvantages, too.
>
>In order to take advantage of the greater
>port-density(-per-dollar) on FR switches right now, the
>end user has to use FR, which is not always practical
>or desirable. =20
>
One of the reasons why end users find frame-relay undesireable is
that they cannot be assured that their provider is not grossly
oversubscribed on PVC-per-port density. When you buy a T1 private
line, you can be assured that you're not sharing it with 120 other
end-users. :-)
DS3/DS1 Backbone/Trunk capacity planning principles, whether across a =
Frame Relay Backbone or Cisco 7000 hdlc trunk network are still the =
same. It's just as easy to over configure DS3/DS1 Cisco HDLC trunks as =
Frame Relay trunks.
Potentially at issue here is not Frame Relay networks as a transport but =
that a Cisco 7000 can not scale properly to support 120+ end-users. :-)
Modern Frame Relay switches:
1) have sub-msec latency
2) can support multiple trunks at DS3+ (to include ATM)
3) are not burdened with processing any of the IP layer 3 nor routing =
overhead
4) because of 3 have a cost per port that is 300 to 400% less than a =
Cisco 7000
5) can have it's backbone shared across multiple services thereby =
reducing both capitalization and bandwidth expense
6) allow ISP to pass the cost savings on to customers
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Jeff Oliveto | Phone: +1.703.760.1764=09
Sr.Mgr Opns Technical Services | Fax: +1.703.760.3321
Cable & Wireless, Inc | Email: joliveto@cwi.net
1919 Gallows Road | URL: http://www.cwi.net/
Vienna, VA 22182 | NOC: +1.800.486.9999
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