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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

125.0. "FDDI and imaging" by WSE014::JENSEN (Paul Jensen) Tue Aug 28 1990 19:28

    Although I am not a support person (I am one of the DS5000
    X Server developers) I am in a position where I need to answer
    some FDDI questions for a customer (University which would
    like to use DS5000's for imaging).  I have spent an hour
    browsing this conference, and haven't been able to find the
    information I need.  Therefore I apologize in advance if
    these are obvious/stupid questions: as in all customer
    situations, goodwill is inversely related to response time,
    and I haven't had any luck finding this information elsewhere:
    
    (1) which version of ULTRIX will support FDDI (on DS 5000)?
    
    (2) what is the software interface?  Presumably TCP/IP,
        but are there any lower interfaces?
    
    (3) The customer wants to connect two DS5000s (~2km apart).
        Do they need any hardware other than the FDDI adaptor
    	boards for the respective machines?
    
    (4) Do they need two pairs of fiber to connect the DS 5000s
        or only one?
    
    (5) Can they use single-mode fiber?
    
    (6) What is the maximum transfer rate between two DS 5000s?
    	What programming interface can achive this rate?
        (they want to blast images from one DS 5000 to the other
    	for display)
    
    Thanks in advance,
    
    					/Paul Jensen
    
    P.S. Is there any FDDI documentation which exists *on-line*
         in *postscript* format?  I'd like to learn more about
         this technology, but I can't justify dinging my cost
         center for the various documents/videos mentioned elsewhere
         in this conference.

T.R	Title	User	Personal Name	Date	Lines
125.1	See note 45.5 for FDDI - system level desc.	STKHLM::TORGNY		`Wed Aug 29 1990 09:02`	1

125.2	See note 44	STKHLM::TORGNY		`Wed Aug 29 1990 09:04`	9
	Hi, To start with there is an FDDI - System Leevel Description available. See note 44.5 Regards, Torgny...
125.3		KONING::KONING	NI1D @FN42eq	`Wed Aug 29 1990 12:50`	12
	I can answer a couple of these questions... (3) As I mentioned in an earlier note, for two nodes on the ring, it suffices to have just the two adapters. Any more than two, you need a concentrator. (4) One fiber pair. (5) No. That would require different transceivers in the adapter. For the other questions you need to talk to the Ultrix people. paul
125.4	SLIP for the Controller	FRAMBO::WILTRUD		`Fri Aug 31 1990 02:23`	6
	Hallo, for the Ultrix support see the note "SLIP for FDDIcontroller" I think they don't want to support FDDI with Ultrix 4.0 Wiltrud
125.5	More answers	AKO569::JOY	Get a life!	`Tue Sep 04 1990 16:44`	24
	Here are some more answers: > (1) which version of ULTRIX will support FDDI (on DS 5000)? Should be Ultrix V4.1 unless another slip occurs. > (2) what is the software interface? Presumably TCP/IP, but are there any lower interfaces? UDP will also work. DECnet Phase V for sure. > (6) What is the maximum transfer rate between two DS 5000s? > What programming interface can achive this rate? > (they want to blast images from one DS 5000 to the other > for display) The max transfer rate you can get out of the DS5000 is about 33 Mbps using UDP is a the lower level protocol. TCP/IP will only crank out about 18 Mbps. This is based on the FDDI demo we used at DECworld. Debbie
125.6	demo caveat	NSSG::ROSENBAUM	Rich Rosenbaum, dtn 226-5922	`Tue Sep 04 1990 17:36`	9
	re: .-1: FDDI/DS 5000 performance figures Keep in mind that those numbers reflect an application that does no disk I/O and very little computing besides pushing bits onto the fiber (I'd guess <5% cpu to (un)paint the bricks). Not exactly a real world benchmark. __Rich
125.7		UPSAR::THOMAS	The Code Warrior	`Tue Sep 04 1990 18:17`	8
	V4.1 only has latent support for FDDI. It won't be supported until a later relase of ULTRIX. DLI is the lowest level interface to FDDI. DECnet-ULTRIX Phase IV kind of works on FDDI but isn't supported. DECnet-ULTRIX Phase V will support FDDI. LAT also works over FDDI as well.