From: Kevin Dobey (kevin.dobey at domain trintech.com)
Date: Fri 14 May 1999 - 16:58:50 IST
To address the earlier question. I understood that Frame rely was actually a
line sharing mechanism. You get the appearance that you have a dedicated
line but in reality you are sharing the bandwidth and you can never be sure
to get the actual through put that you think you are buying.
Large Companies that have mission critical WAN connections will avoid frame
relay as I understand it.
I remember when I was in college TE were suggesting that the college switch
to a Frame relay connection. The Network Manager was very reluctant to do
this. TE were basiclly tring to increase there revenue on the lines they
had. (I don't know what happened afterwards).
I also heard a story about a company that wanted a on-demand dial up ISDN
backup line with a certain maximum capacity (high). TE wanted to charge a
silly price for this and to turned out cheeper to actually get a leased 2
Meg leased line and leave it idle.
TE didn't even seem to relise this when submitting there proposal !!
I thought that contention = Frame Relay (+ similar types of protocols).
I understand that most leased lines are frame rely and X25.
I don't think ATM has been deployed anywhere much in Ireland.
EXCEPT in maybe CIT (Cork RTC) where there is a ATM test bed set up in
conjunction with TE (I think Aiden McDonald is they dude doing all that down
There was an article in that TE Magazine Recently (what's in called?) about
it I think.
Some one please enlight us (or correct the error pf my ways)
I find out some more about this over the weekend and report back on Monday
(Have a good weekend folks !!)
Sorry i did receipt again on my imac mail opps !!)
From: Paul Jakma [mailto:paul at domain clubi.ie]
Sent: 14 May 1999 16:29
To: Roy White
Cc: 'Paul Curtayne'; ILUG
Subject: RE: [ILUG] OT: read and puke
On Fri, 14 May 1999, Roy White wrote:
It basically means, how many other people, companies, entities are using
in dublin the contention is about 4:1 i.e. 3 other people are usuing as
well as yourself.
MCI worldcomm offer a 1:1 contention ratio, but that works out at about
29K per year.
for 512K line not too sure about 128K?
they are the only people who do it, if you push stentor they might as
well. I am led
to believe that contention is a serious thing to consider in factoring
price of lines,
but i'm no expert.
How are leased lines implemented in this country? Frame relay over
fractional T line, or ATM over T line? If contention is a possibility
then it must be ATM right? (frame relay is circuit-switched.. no
(or have i got it all backwards and in need of re-reading T.baum's
"computer networks"?) :)
-- Paul Jakma paul at domain clubi.ie http://hibernia.clubi.ie PGP5 key: http://www.clubi.ie/jakma/publickey.txt ------------------------------------------- Fortune: Don't mind him; politicians always sound like that. -- Irish Linux Users' Group: ilug at domain linux.ie http://www.linux.ie/mailman/listinfo/ilug for (un)subscription information. List maintainer: listmaster at domain linux.ie
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