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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

1025.0. "6000 and 7000 directly via FDDI" by ODIXIE::RICHARDSON (Are we there yet??) Wed Jul 14 1993 13:35

    Can a 7000 and a 6000 be connected back to back via FDDI without
    going through a concentrator?
    
    Is the concentrator more than just a "DELNI like" device so devices
    need to be attached to it, or, like a DELNI, is it more of a FDDI in a
    box?
    
    there is nothing else in the network.. just these 2 devices.
    
    Thanks

T.R	Title	User	Personal Name	Date	Lines
1025.1	valid 2-node ring	ASDS::LEVY		`Wed Jul 14 1993 14:37`	1
	Yes. S-to-S connections (via fiber) are always valid.
1025.2	DEMFA to DEMFA	GIDDAY::STANISLAUS		`Thu Jul 15 1993 05:09`	18
	Re .1 can you please explain for my own understanding. Wouldn't you need some sort of a crossover ? Does the BN24B-xx (which is the FDDI-MIC to FDDI-MIC) cable have the TX to RCV crossover ? I was under the impression the the DEFCN-N* or DEFCN-H* FDD-MIC 4 or 6 port card does the TX to RCV changeover. Here we use the BN24B cable between DEMFAs and DEFCN ports. So according to .1 the cable for direct S-to-S port connection may not be BN24B. What is it then ? Please explain. Alphonse
1025.3		JEDI::CAUDILL	Kelly - NaC Tech Support - 264-3320	`Thu Jul 15 1993 12:00`	6
	The MIC-MIC cables do contain a cross-over. This is necessary to connect to anything (station or concentrator). But there are problems (features?) of the VMS FDDI device driver which might cause you problems. I think this is being (or has been) addressed. But I don't know which versions of what s/w include the improvements.