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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

608.0. "S port to S port?" by ODIXIE::DWILLIAMS () Sat Jun 13 1992 01:13

    I have a customer...Engineers....who want to know WHY they can't hook a
    XMI/FDDI S port directly to an FDDI/Ethernet SAS Bridge S port. It says
    in the FDDI Configuration Guide that it is not recommended...but will
    it work? Would it be supported? Why isn't it recommended? They are
    engineers and want to know why they have to buy that expensive
    concentrator! Simply saying it isn't supported isn't going to help me
    any with these guys so I hope someone can put a few words around it or
    point me to some that will satisfy their quest for knowledge...
    
    Thanks,
    
    Dave
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608.1MIPSBX::thomasThe Code WarriorSat Jun 13 1992 13:363
It will work but as soon as they add a third device, they will need a
concentrator.  [I have a 6330/DEMFA/DECbridge-500 running that way
right now]
608.2Ok for lab setups, not for real people!MSBCS::KALKUNTERam Kalkunte BXB1-1/D3Mon Jun 15 1992 00:199
    It is possible but leads to complex fiber connections which will need to 
    be engineered rather than configured. Also leads to ring availability 
    problems when one or more nodes are not functional. I have done some of
    this before but I would not recommend this for a customer. I believe 
    there is an article covering this subject. I don't have the reference 
    info handy but maybe someone else will post it. I agree that the reasons 
    have to be understood before recommending the configuration to customers.
    
    Ram
608.3If only 2 nodes then S-to-S OKQUIVER::PARISEAULuc PariseauMon Jun 15 1992 11:387
	If you only have TWO nodes there is NOTHING wrong with an
	S to S connection.  If one node goes does so does the ring but
	who cares, you don't have anybody to talk to anyway!

	Luc
	SMT Project Leader
608.4S-S is LEGAL!!!KONING::KONINGPaul Koning, A-13683Mon Jun 15 1992 13:2726
*((&$@*(&$*(&$@(!*$&*( %&(* @#&%$(*&(@&*@$#(*&

ARGH!!!!

This keeps coming up about once every other week.  Now I finally know why.

The configuration guide is WRONG.  Repeat, WRONG.

An S-S connection is 

	1. Supported by the ANSI standard
	2. Supported by all our products
	3. Perfectly reasonable
	4. Perfectly sensible

All this provided you remember that it is a TWO station non-extensible
configuration.  If that's what you want, and/or you're prepared to buy
concentrator(s) as soon as you want a third station, go for it.

Would someone who knows the author of the Configuration Guide please report
this documentation error?  It's causing severe confusion and may well
cause some people to think that DEC doesn't implement the standard correctly
(since it's clear from the standard that the "not recommended" statement
is NONSENSE).

	paul