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- From: montjoy@thor.ece.uc.edu (Robert Montjoy)
- Newsgroups: comp.sys.sun.hardware
- Subject: Re: Sun is violating the Ethernet-Spec with its
- Message-ID: <1992Nov8.045104.3871@babbage.ece.uc.edu>
- Date: 8 Nov 92 04:51:04 GMT
- References: <1992Nov2.230122.6670@Informatik.TU-Muenchen.DE> <1992Nov4.165432.4917@news.duc.auburn.edu> <BxC6qA.FIz@zoo.toronto.edu>
- Sender: root@babbage.ece.uc.edu (Operator)
- Organization: Unversity of Cincinnati, ECE Dept
- Lines: 41
- Nntp-Posting-Host: thor.ece.uc.edu
-
- Hi.
-
- In article <BxC6qA.FIz@zoo.toronto.edu> henry@zoo.toronto.edu (Henry Spencer) writes:
- >In article <1992Nov4.165432.4917@news.duc.auburn.edu> elling@eng.auburn.edu writes:
- >>Rule #1 for ethernets, turn off SQE. I know of no hardware made in a
- >>*long* time that needs SQE...
- I think you are confused on what SQE is used for.
- >
- >Are you sure you don't have this backwards? It's the old hardware that
- >*didn't* do SQE and could react badly to it. A fair bit of new stuff
- >does get unhappy if it doesn't see SQE.
- The SQE signal is a TEST signal. It tests to see if the
- collision decection software is working. Whenever possible it
- should be turned on. It does not get out on to the Ethernet.
- It is just between transciever and device.
- >
- >>... If you have SQE enabled, the transceiver
- >>can put extra junk on the trunk that may contribute to collisions.
- If the transceiver is acting this way it is "badly broken".
- >
- >Documentation, please, preferably including identification of specific
- >models of transceiver which do this. SQE is supposed to be entirely,
- >completely, 100% local to the drop cable. No properly-functioning
- >transceiver will put anything on the Ethernet itself as a result of
- >SQE. (With one proviso: that you follow the rule saying "no SQE on
- >transceivers connected to a repeater".)
- This is correct(except some DEC multi-port FANOUT boxes work
- better without(DELNI).
-
-
- BTW see my other posting.
-
-
-
- --
- Rob Montjoy - Rob.Montjoy@UC.Edu
- Computer Engineer - montjoy@ucbeh.BITNET
- University of Cincinnati - montjoy@babbage.ece.uc.edu
- Electrical and Computer Engineering - uunet!uceng!rmontjoy
-
- -- To Save the Earth. The Humans must die.
-