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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

3734.0. "DH900 > H4005???" by SCASS1::GALVIN (The Energizer Bunny's Trainer...) Mon Jul 22 1996 17:05

    	Question on DEChub900 >>> H4005 Ethernet Tap
    
    I have a DEChub900 with multiple repeaters and a DECswitch (ethernet >
    FDDI).  I have 3 LAN segments that have been tapped using 4005s. I have
    setup 1 LAN segment using the DECswitch's AUI port.
    
    I would like to setup 2 more LAN segments using the repeaters.  The
    problem I see "initially" is that I have an H4005 which provides a
    male AUI attachment.  The repeaters are ALL RJ45...
    
    Do we support using a DETpm (AUI > RJ45), attaching it to the H4005's
    AUI and then running a 10BaseT cable to the repeaters?
    
    This sounds like a "hack"... ok, it IS; however, we initially planned
    to use 2 NIS routers with a DETpm on the AUI LAN interface of the
    router and attach the repeaters that way...
    
    thanks in advance,
    
    /Mic
T.RTitleUserPersonal
Name		DateLines
3734.1Try this...NPSS::CALEYFlat out like a lizard drinking...Mon Jul 22 1996 18:4224
    Hi,
    
    A couple of questions?
    
    1. The DECswitch 900EF has two AUI ports to use. What's happening with
       the other AUI port.
    
    2. Why do you wan't each Thickwire tap to go into an RJ45 repeater?
    
    On the issue of DETPM to H4005..**this will not work**. The DETPM-AA is
    a transceiver and expects to be powered from an Active device. The
    config. you were asking about is a passive-passive connection. A
    H4005 cant be plugged in with a DETPM.
    
    You're best bet (If someone else has a better idea, please let me
    know!) would be to use the two AUI ports on the DECswitch 900EF for
    twop of the LANs and put in a DECrepeater 90FA to provide you with the
    third AUI connection into the Hub. Of course the 90FA will only connect
    to the default 'thinwire' channel in the Hub backplane. 
    
    Regards,
    
    Jason
3734.2Use a DEFMI and/or DETML in a stack34937::DANZAKPittsburgher �Tue Jul 23 1996 07:3123
    Of course, the DEFMI (DECrepeater 90FS) does have *ONE* flexlan
    available to it.  Although it is a 90 module it does allow for one
    FLEXlan connection (the first flexlan).  So you could use it's AUI.
    (note that the hub's MAM (management module) will take the first
    FLEXlan that you connect the DEFMI onto and magically relocate it to
    the upper connector.  Note that this also only works with ONE set of
    DEFMI modules or DETMI modules - it won't work with module #2 in the
    hub (i.e. to a different LAN) because there is only room for one
    FLEXlan on the upper connector..)
    
    
    The DECrepeater 900GM also has an AUI on it.
    
    If you didn't want to consume a hub slot, you could also externally use
    a DETML in a Stacking unit which has an AUI on the back of it.  (Note
    that this stack with the AUI is only supportd with the DETML.)  Take
    the Twisted pair to the DECrepeater 900 from the DETML and the AUI to
    the transciever.  (They do make AUI to TP boxes - which are active
    components and, essentially a single port repeater, so why not just use
    a DEC product instead and get a few more repeater ports...)
    
    Hope that helps,
    j