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- Newsgroups: comp.protocols.tcp-ip
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!saimiri.primate.wisc.edu!ames!Dell486.TGV.COM!karl
- From: karl@empirical.com (Karl Auerbach)
- Subject: Re: Moving from coax to 10BaseT
- Message-ID: <karl.6.728019489@empirical.com>
- Sender: usenet@news.arc.nasa.gov
- Organization: Empirical Tools and Technologies
- References: <19971@mindlink.bc.ca>
- Date: Tue, 26 Jan 1993 03:38:09 GMT
- Lines: 47
-
-
- >In a recent column in OST James Gaskin suggests that system administrators
- >should be converting ethernets from coax to 10BaseT and *not* investing
- >anything more in coax. I put two questions to the readers of this group:
- >
- >1) Do you concur with Mr. Gaskin that coax is dead or dying?
- >
- >2) What options are available for small (less than a dozen nodes) networks
- >currently running coax and wanting to move to 10BaseT? For example, I
- >understand that 10BaseT topology has all nodes wired to hubs - are there hubs
- >available which are cost effective for small networks?
-
- I lead the Interop "wipe out thinnet" brigade. I strongly agree that
- thinnet should go the way of punched cards.
-
- About the *only* remaining use for thin-net any more is where you have a
- cluster of machines, say a collection of X terminals, all in one room. When
- we design and build Interop, that is the only way we will use cheapernet.
-
- (We now use fiber-optic Ethernet rather than thick coax for the long runs.)
-
- I would never run thin-net through a wall and I would never put it where
- high reliability is required. Because coax (whether thick or thin) does not
- limit termination or shorting problems, it tends to break whenever a user
- gets it into his mind to move something.
-
- 10-Base-T, on the other hand, is much more robust. The wire itself is more
- solid. (And if you use the standard 4-pair stuff, you get two spare pairs,
- just in case.) If you use level 4 or level 5 wire, you can run it quite a
- long distance. The RJ45 connectors tend to be pretty solid, much more so
- than most coax connectors (at least with respect to how they connect to the
- cable itself.)
-
- 10-Base-T hubs also often have very nice properties -- they can block out
- screeming (jabbering) hosts, block hosts which are sending mal-formed
- packets, enforce security, etc. They often gather interesting statistics
- about which hosts are using the net, etc.
-
- The 10-Base-T link state light itself is worth many man-hours of saved labor
- whenever a user calls up and says "my machine isn't talking on the net."
-
- On some hubs you can also disable retiming. This can increase your repeater
- budget, and hence allow end-users to put in their own fan-out boxes.
-
- --karl--
-
-
-