home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!wupost!waikato.ac.nz!comp.vuw.ac.nz!asjl
- Newsgroups: comp.dcom.lans.ethernet
- Subject: Re: 10Base-2 connection limits
- Message-ID: <Bu6HH5.CpL@comp.vuw.ac.nz>
- From: Andy.Linton@comp.vuw.ac.nz (Andy Linton)
- Date: Sun, 6 Sep 1992 22:36:40 GMT
- Sender: news@comp.vuw.ac.nz (News Admin)
- References: <Bu2EC7.1qr@world.std.com> <12pns7_.seifert@netcom.com>
- Organization: Dept of Comp Science, Victoria Uni, Wellington, NEW ZEALAND
- Nntp-Posting-Host: st-james.comp.vuw.ac.nz
- Lines: 33
-
-
- In article <12pns7_.seifert@netcom.com>, seifert@netcom.com (Rich Seifert) writes:
- |> In article <Bu2EC7.1qr@world.std.com>, edwards@world.std.com (Jonathan Edwards) writes:
- |> > I want to set up a small 10Base-2 network, and am thinking of running the
- |> > coax as homeruns to the wiring panel for better fault tolerance.
- |> > My question is whether I can avoid useing a hub, and just tie them together
- |> > with a sequence of T-connectors?
- |> > Is there a specified limit to how far I can take this?
- |> >
- |>
- |> No, No, NO, NO, NOOOOO! 10Base2 cannot be wired as a star as you describe.
- |> It requires wiring as a linear bus, (aka daisy-chaining) from station-to-
- |> station. If you want to use star-wired coax, a multiport-repeater must
- |> be used at the star center (you may call this a hub, if you wish, but
- |> I don't).
-
- You could get a "star" configuration by running two lengths of coax from your
- patch panel to each location that you want to connect and then connecting the
- bus up with 'T' connectors and short jumpers at the patch panel. You'll chew up
- your 180 metres fairly quickly doing this of course.
-
- I'd go for 10BaseT. Even allowing for the cost of the hub - we pay under US$500
- for one here in New Zealand - I'd recommend it. Naive users can't screw
- everybody else by unplugging their workstation and if you put good cable in
- you'll be able to upgrade to 100Mbps later. You can also use the cabling for
- good old RS232, Appletalk if you need it. Invest in your cabling - do it right
- and it will outlast your existing equipment by a couple of generations.
-
- |> No "stubs" are allowed on 10Base2; the coax cannot branch using T
- |> connectors anywhere. T connectors are used to attach stations to the
- |> cable, with a short (zero) length tap.
-
- Rich's point about "stubs" is spot on of course!
-