Conference netcad::hub_mgnt

    The AUI connector is female, like a station's, so you would need a
    DELNI in between.  Or, you could go to a 10BaseT port through one
    of those little AUI to 10BaseT MAU's (DETPM?).
    
    Anil

    I have a quick Question about the DECBridge900MX, and it's AUI port
    implementations.
    
    Can the DB900MX in a stand-alone configurations, with the Docking
    Station, be configured to service THREE AUI Ports, and three 10BaseT
    ports?   
    
    I understand that the DB90MX has two AUI ports on it's front panel, and
    four RJ45's, and an FDDI DAS port.  Can I use the port switching, to
    enable the two AUI's on the front, and the AUI on the rear of the
    docking station to simultaneously bridge three ThickWire backbones onto
    an FDDI network, while connecting three Host CPU's via 10BaseT?
    
    I assume that the RJ45 10BaseT ports on the front panel are not
    "cross-over" ports, and are wired straight-through.  Therefore, I would
    need a 10BaseT "flip" cable to connect a Host CPU's MAU to the DB900,
    such as the BN24F-xx.   Is the MDI-X (10baseT cross-over) switch-able
    via software?  
    
    Can I use SNMP management (the customer does not have Hubwatch, but
    does have POLYCENTER 400 Network Manager), to change the AUI port from
    one of the RJ45's on the front panel, to the rear AUI?  Or do I need to
    use the OOB terminal port on the docking station to do all the setup?
    
    Thanks for any help.
    
    JR
     

    Yes, one of the 10BaseT ports (I think port 4 of the bridge) can be
    switched to the AUI on the D/S for a total of 3 AUIs and 3 10BaseT's.
    The traffic LED will glow yellow instead of green, as is the case
    when switched to a hub backplane, to indicate this.  This can be done
    via the console setup port currently (not OBM, that's for out-of-band
    SNMP management) and in an upcoming release will also be switchable
    via SNMP management/HUBwatch.
    
>    I assume that the RJ45 10BaseT ports on the front panel are not
>    "cross-over" ports, and are wired straight-through.  Therefore, I would
>    need a 10BaseT "flip" cable to connect a Host CPU's MAU to the DB900,
>    such as the BN24F-xx.
    
    Yep.  Another way is to use a small adaptor on the 10BaseT port which
    will convert a crossover port to straight-thru and vice-versa - I believe
    there is a DEC part # for this but not sure what it is.
    
>    Is the MDI-X (10baseT cross-over) switch-able
>    via software?
    
    No, software can't be used to do this.
    
    Anil

    I was under the impression that you needed a repeater between 10BASET
    devices.
    
    I want to hook a system directly to a 10BaseT port on a DECbridge
    900MX. According the installation document for the DB900MX, you can
    simply connect the 2 devices together with a crossover cable.
    
    Why DON'T you need a repeater between 2 10BaseT devices?

    
    10BaseT works fine station-station; you just need a different cable. 
    It's a degenerate case - a two node ethernet.
    

    AUI station-to-station connection would work if a cable existed to
    connect them together.  However, AUI is not suitable for point to
    point connections; while that is one of the main advantages of
    10BaseT which is typically implemented as a star-wired system.
    (You could connect an AUI station to one of the 10BaseT ports
    by using the 10Baset to AUI converter which I believe is called
    DEBMP and sells for under $50 as far as I can recall.)
    
    Anil

    Well, since 10BaseT to 10BaseT is allowed, why couldn't I simply put a
    10BaseT adapter on both devices and simply put a crossover cable
    between them?

    Sure, you could do that.