home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.sun.hardware
- Path: sparky!uunet!cis.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!agate!spool.mu.edu!darwin.sura.net!news.duc.auburn.edu!netman!elling
- From: elling@eng.auburn.edu (Richard Elling)
- Subject: Re: Sun is violating the Ethernet-Spec with its
- Message-ID: <1992Nov4.165432.4917@news.duc.auburn.edu>
- Sender: usenet@news.duc.auburn.edu (News Account)
- Nntp-Posting-Host: netman.eng.auburn.edu
- Reply-To: elling@eng.auburn.edu
- Organization: Auburn University Engineering
- References: <1992Nov2.230122.6670@Informatik.TU-Muenchen.DE>
- Date: Wed, 4 Nov 1992 16:54:32 GMT
- Lines: 33
-
- 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
-
-