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Conference 7.286::fddi

Title:	FDDI - The Next Generation

Moderator:	NETCAD::STEFANI

Created:	Thu Apr 27 1989
Last Modified:	Thu Jun 05 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	2259
Total number of notes:	8590

464.0. "environment & thinwire use" by EVTAI1::GROSSETETE () Wed Jan 29 1992 11:36

    Is there any document which describes the environment limitation
    when using Thinwire cable for a FDDI connection (DEFCN <-> DEFZA) ?
    
    Let's say we installed a such configuration in a air traffic control
    room with radar over the roof, any problem ???
    
    	Patrick

T.R Title User Personal
Name Date Lines

464.1 KONING::KONING Paul Koning, NI1D Wed Jan 29 1992 16:36 15

T.R	Title	User	Personal Name	Date	Lines
464.1		KONING::KONING	Paul Koning, NI1D	`Wed Jan 29 1992 16:36`	15
	Clearly if Ethernet would have trouble in that environment, FDDI over coax will do no better (and in fact worse). There are cable testing procedures in the installation manual for (I believe) the concentrator -- but that may not cover interference issues. One approach is to install something and test it, using the error counters. That won't help if new sources of interference are installed later, or if the interference is extremely location-dependent (move the cable a foot and it changes -- which is quite plausible). For the sort of application you mentioned, the best answer may well be to spend the small amount of extra money and use fiber, since that will definitely give you the best signal integrity. paul

Clearly if Ethernet would have trouble in that environment, FDDI over coax
will do no better (and in fact worse).  There are cable testing procedures
in the installation manual for (I believe) the concentrator -- but that may
not cover interference issues.

One approach is to install something and test it, using the error counters.
That won't help if new sources of interference are installed later, or if
the interference is extremely location-dependent (move the cable a foot and
it changes -- which is quite plausible).

For the sort of application you mentioned, the best answer may well be to
spend the small amount of extra money and use fiber, since that will definitely
give you the best signal integrity.

	paul