[1043] in resnet
Re: Wiring Question
daemon@ATHENA.MIT.EDU (Eric Rosenberry)
Thu Mar 28 20:37:11 2002
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Message-ID: <004501c1d6c1$87d48a90$0300a8c0@ericrmobl>
Date: Thu, 28 Mar 2002 17:32:03 -0800
Reply-To: Resnet Forum <RESNET-L@listserv.nd.edu>
From: Eric Rosenberry <eric@ROSENBERRY.ORG>
To: RESNET-L@listserv.nd.edu
In-Reply-To: <NDBBIGEEGLOCOICPMEGIIEAMCIAA.randallw@hawaii.edu>
Copper will continue to rule the desktop for the gigabit revolution. As
for the 10 gigabit revolution, time will tell. Five years ago, people
were saying gigabit would have to be on fiber, now, people are saying
that about 10 gigabit. If I were installing a resnet right now, I would
install CAT 5e (or CAT 6 if it were only nominally more expensive) to
the desktops along with 100 megabit switches. With that cable plant you
would be at least able to go to gigabit to the desktop, and with CAT 6
you might be able to go beyond.
For the building risers back to the main building switch, I would also
use CAT 5e or CAT 6 but I would run it through conduit such that it
could be easily replaced in the future when you go to gigabit to the
desktop and need 10 gigabit risers. As for the speed connection I would
use, that would depend on the number of students on each floor and the
cost of the equipment. Optimally, I would have gigabit from each floor
switch to the building switch. If that were cost prohibitive I would
use fastetherchannel on two 100 megabit lines to connect up to the
building switch. That way a single student could not cause slow
performance for the entire floor.
As far as the speed to each user issue goes, the question is what are
they doing with it, if they are only using it for web access 10mbps is
fine probably for the next two years. This is assuming however that it
is 10mbps switched. If it is a hub environment your run into issues
when one user on a hub starts a file transfer to another user on the
network and they max out the hub very easily. Then other users on the
same hub start complaining about slowness. Also, unless you have hubs
with some feature like port security you have issues with people
sniffing traffic.
One last thing to consider is that if you provide students a fast
internal network (i.e. 100 megabit instead of 10), they would be much
more inclined to attempt to find the files they need on the local
network instead of downloading them on the internet.
-Eric
-----Original Message-----
From: Resnet Forum [mailto:RESNET-L@listserv.nd.edu] On Behalf Of
Randall Watanabe
Sent: Thursday, March 28, 2002 1:22 PM
To: RESNET-L@listserv.nd.edu
Subject: Wiring Question
Hi all,
We are currently looking at doing a significant rewiring in most of our
buildings to replace the VERY OLD existing cable that is supposedly
"almost"
cat3 quality. The current proposal is to rewire to provide gigabit
Ethernet
over copper to the desktop. Basically what I'm wondering is if you had
an
opportunity to pull new wires, where cost IS a factor, what would you
put
into the buildings? Here's what I'm currently thinking:
Our current wiring is good enough to support 10Mbps to the desktop. If
we
were to somehow eliminate the bandwidth bottleneck currently in our main
connection to the 'net, is there a justifiable need for students to have
more than a 10Mbps connection each? If not now, when will 10Mbps be
insufficient for legitimate academic needs?
What kind of NIC will be standard in 5 years? 10? Will it be cards
supporting gigabit Ethernet over UTP or will it be fiber NICS?
If 10Mbps is enough to last for 5 years, after which time fiber NICS
become
more widespread, then shouldn't we wait on rewiring for a few years
until we
can go straight to fiber? At the same time, if 10Mbps becomes too slow
in 3
years and UTP is still the standard wiring out there then we would be
wise
to put in higher quality copper now.
So what would you all advise?
Thanks in advance for all responses, and if I'm not making sense please
be
sure to let me know.
Randall Watanabe
Resnet Computer Specialist
UH Student Housing Services
randallw@hawaii.edu
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