Conference netcad::hub_mgnt

1782.0. "90C's in Hub 900 questions" by ODIXIE::RICHARDSON (Are we there yet??) Wed Dec 14 1994 11:20

    I'm trying to configure a HUB 900 to do some "simple" bridging to FDDI. 
    Applications is an imaging application with multiple PC's accessing the
    imaging Server.  The PC's are currently configured in an old Ethernet
    set-up with DEMPR's, DELNI's, etc and no FDDI exists.
    
    What I would like to do is initially keep the PC lan cards the same
    (thinwire) as there are about 100 of these and I don't think the
    customer would be willing to replace them all with UTP.  SO - for the
    900, the only option is the 90C.  I'd like to bridge about 20
    PC's/segment, having 5 ethernets coming into the DECswitch 900EF and
    connect the Imaging server to the FDDI port on the 900 EF (it' adapter
    would of course have to be changed).
    
    My questions are:
    
    1.  Can this be done?  I've seen something somewhere where only port 3
    of the 900EF supports thinwire.  Does this make a difference here?  I
    thought Ethernet was EThernet, regardless of the type of wiring.  I
    obviously need 5 of the 6 ethernets to be talking to thinwire type
    ethernets.
    
    2.  Can the 90C be connected to various ethernet channels on the 900
    backplane?  I was just wondering since it's not a 900 module and I'd
    like each 90C to be a separate bridged segment.
    
    3.  Is an agent required to manage the 90C's?  I'm assuming it is.
    
    Thanks for the help/clarification
    
    Cindy

    One more question:
    
    Can I connect more than 1 FDDI device (server) to the FDDI port on the
    900EF or do I need to put in a DECconcentrator in order to support
    multiple FDDI adapters/devices?

    I just had a conversation with someone who has straightened me out.:
    
    1) I DO need a DECconcentrator for ANY external FDDI device.
    
    2) I Don't need the 90C's - just use some DECXM-AA maus for the AUI
    ports and some BN25G cables and DETTR-AA's for the twisted pair ports
    to convert all to thinwire.
    
    3) An agent will NOT be needed
    
    I think that covers it!

    If you have only a single DECswitch 900EF and 1 or 2 FDDI servers
    then you can connect them straight into the A and B ports of the
    DS 900EF.  The A B ports will accept S ports.  Just saves the cost
    of a concentrator for simple congigueations.
    
    dave