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Conference netcad::hub_mgnt

Title:DEChub/HUBwatch/PROBEwatch CONFERENCE
Notice:Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7
Moderator:NETCAD::COLELLADT
Created:Wed Nov 13 1991
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:4455
Total number of notes:16761

1169.0. "single mode fiber support?" by ODIXIE::RICHARDSON (Are we there yet??) Tue Jun 28 1994 14:27

    I Have a site that is using both single mode and multimode fiber (mixed
    for redundancy/distance issues).  I know all the hub fiber modules
    (repeaters and bridges) support multimode fiber but what about single
    mode?  I can see that the DECconcentrator 900 supports both (depending
    on how it's configured), but can any of the repeaters or bridges be
    configured to support single mode fiber?  If so, what are the specific
    part numbers to do so?
    
    thanks
    
    Cindy
T.RTitleUserPersonal
Name		DateLines
1169.1Ethernet 10BaseFL repeaters don't support single mode fiberLEVERS::PAGLIARORich Pagliaro, Hub Products GroupTue Jun 28 1994 14:3912
    Fiber Ethernet repeaters do not support single mode fiber. The 10BaseFL
    standard, to which Digital's fiber repeaters comply, only specifies
    multi-mode fiber support.  There is no real benefit in using single
    mode fiber on Ethernet repeaters. The max network length would
    still be limited by the Ethernet timing budget (ie round trip
    propagation delay), regardless of how far the single mode fiber could
    reliably transmit data. 
    
    
    Regards,
    
    Rich
1169.2what about bridges?ODIXIE::RICHARDSONAre we there yet??Tue Jun 28 1994 15:4210
    I assume this is true for bridges also?  There may or may not be a
    benefit in using single mode fiber, but that is what is available for
    them to use.  Is there no way to use single mode fiber with our bridges
    (maybe utilizing a 3rd party single/multi converter - if there is such
    a thing?).
    
    I'd hate to have to tell them we can't use their expensive single mode
    fiber that already exists between locations...
    
    Thanks
1169.3There are vendors who make optical converters,,,,,NACAD2::BATTERSBYTue Jun 28 1994 16:257
    There are vendors out there who make optical converters.
    ODS (Optical Data Systems) is one that comes quickly to mind.
    They are based in Texas I think. I don't have any other information
    other than Digital has used ODS in the past as a third party vendor
    to help us in site solutions such as this.
    
    bob
1169.4more info:VAXRIO::ROLFVaporware Design SpecialistWed Jun 29 1994 14:1019
    I just happen to have a 2 year old catalog of ODS at hand.
    
    They have 3 types of converters:
    
    ODS 377 	Token Ring, FOIRL Ethernet, RS232 Muxes, IBM 3270 Muxes
    	        (820 nm multimode)
    
    ODS 378	Ethernet  (820 nm Multimode)
    
    ODS 379	DEC Ethernet Bridges (1300 nm multimode)
    
    The 379 was (at that time) quoted at $ 5362.50 (DEC discount price)
    
    Their phone: 214-234-6400 - FAX: 214-234-1467
    
    address: 1101 E. Arapaho Road, Richardson, TX 75061
    
    Rolf, DEC Brazil