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From: cjp@megatek.UUCP (Christopher J. Pikus)
Newsgroups: sci.electronics
Subject: Re: Surge protection for Cheapernet
Message-ID: <1489@valhalla.megatek.uucp>
Date: 25 Feb 91 13:36:40 GMT
References: <4480@mint17.UUCP>
Distribution: sci
Organization: Megatek Corporation, San Diego, Ca.
Lines: 22

From article <4480@mint17.UUCP>, by wilner@motcid.UUCP (Corey S. Wilner):
> I have an interesting design problem.  I need to protect a Cheapernet
> LAN tap from voltage surges.  I have to pass a specification that
> states either 800 or -800 volts can be applied to my BNC center conductor
> with respect to the outer ground conductor.
>
> ********************************************************
> Corey S. Wilner    |                            |   __o
> Motorola Cellular  | ..!uunet!motcid!wilner     |  -\<,
> 708-632-7206       | motcid!wilner@uunet.UU.NET |  O/ O
> ********************************************************

	Corey, From several of the ethernet cards that I have seen, many
designers solve this with a NEON BULB connected accross the BNC. It should
present almost no capacitance and have high breakdown voltage. A dropping
resistor is optional (although I never saw one used).
 
-- 
Wax your board, waste your brain, and pray for waves...
Christopher J. Pikus,               Megatek Corp.
INTERNET:     cjp@megatek.uucp      San Diego, CA
UUCP:         uunet!megatek!cjp or ucsd!megatek!cjp


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