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From: wam@cdx39.UUCP (Bill MacLeod x7520)
Newsgroups: comp.dcom.lans
Subject: Re: Ethernet collision detection/voltages
Message-ID: <680@cdx39.UUCP>
Date: Wed, 18-Mar-87 16:56:25 EST
Article-I.D.: cdx39.680
Posted: Wed Mar 18 16:56:25 1987
Date-Received: Sat, 21-Mar-87 03:00:13 EST
References: <215@ucdavis.UUCP> <551@houxv.UUCP>
Organization: Codex Corp, a division of Motorola; Canton, MA, USA
Lines: 15
Summary: between 9 and 29 bit times to detect collision

In article <551@houxv.UUCP>, rdt@houxv.UUCP (R.TRAUBEN) writes:
> Question: How long after the 50% 1's density is violated does
> 	 it take for the collsion detector to go off?
in this article, I answer: beween 9 and 29 bit times.  That's
up to 2.9 microseconds, depending on how far away and feeble the
interfering station is...

IEEE 802.3 working group on System Topology could help you here;
I understand they even have a spreadsheet for delay budgets...

-- 
	Bill MacLeod           telephone: 617/364-2000x7520
Email: ...{cthulhu,inmet,harvax,mit-eddie,mot[bos],rclex}!cdx39!wam
Smail: Codex Corporation; Mailstop C1-65; 20 Cabot Blvd; Mansfield MA 02048
send two boxtops and one thin dime for standard non-disclosure agreement...