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- Newsgroups: comp.sys.sun.hardware
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!spool.mu.edu!news.nd.edu!wizard!corporon
- From: corporon@wizard.helios.nd.edu (phillip corporon)
- Subject: Re: Sun is violating the Ethernet-Spec with its
- Message-ID: <1992Nov5.134446.25213@news.nd.edu>
- Sender: news@news.nd.edu (USENET News System)
- Organization: OUC, University of Notre Dame
- References: <1992Nov2.230122.6670@Informatik.TU-Muenchen.DE> <1992Nov4.165432.4917@news.duc.auburn.edu>
- Date: Thu, 5 Nov 1992 13:44:46 GMT
- Lines: 47
-
- In article <1992Nov4.165432.4917@news.duc.auburn.edu> elling@eng.auburn.edu writes:
- >In article 6670@Informatik.TU-Muenchen.DE, bartel@Informatik.TU-Muenchen.DE (Elmar Bartel) writes:
- >>
- >>Hi folks,
- >>This are bad news.
- >>
- >>If you happen to administer a network with more then 30 or 50
- >>suns (ie SparcI, SLC) on one ethernet segment, you will probably
- >>observe an abnormal high collision rate.
- >[description deleted]
- >
- >I run several networks this size and don't see significant collision
- >rates. Since Elmar doesn't describe the physical implementation of
- >his ethernet, his detailed description doesn't really help describe
- >the problem. It may also lead to widespread panic and unwarranted
- >finger pointing.
- >
- >Elmar, are you measuring the voltages on the AUI side or the trunk
- >side of the transceiver?
- >
- >Are you using thin net (10base2)? If so, the limit is 200 meters
- >of cable with no more than 30 nodes. There are many bad things that
- >happen to thin net that can cause severe collision problems.
- >
- >Rule #1 for ethernets, turn off SQE. I know of no hardware made in a
- >*long* time that needs SQE. Unfortunately, many vendors ship ethernet
- >transceivers with SQE enabled. If you have SQE enabled, the transceiver
- >can put extra junk on the trunk that may contribute to collisions.
- >
- >---
- > Richard Elling Manager of Network Support
- > Auburn University Engineering Administration
- > richard.elling@eng.auburn.edu KB4HB [44.100.0.72] (205)844-2280
- >
-
- With respect to SQE, IBM Xstations, at least the 130, *do* require
- SQE when booting remotely. If there is a valid work around this I'd
- be interested in hearing about it. Thanks...Phil.
- ********************************************************************
- Phillip G. Corporon - Computer, Electronic & Network Specialist
- Department of Computer Science and Engineering
- University of Notre Dame, Notre Dame IN 46556
- internet..: phil@cse.nd.edu Voice.: (219) 239-5893
- applelink.: A0393 Fax...: (219) 239-8007
- bitnet....: f3pb88@irishmvs.bitnet
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