Conference netcad::hub_mgnt

    I also would like to know if two DECswitch 900EF in the same DEChub900
    can be connected via FDDI without any external cables?
    
    Norm

>    	I need an info on DECswitch 900EF. I've to know if this module
>    	it's a real bridge between a FDDI LAN and 6 Ethernet LANs. 
  	
It is a 'real bridge'. It is also a 'real' switch.
  
>    	How is it possible to connect a 10base5 segment to a 10baseT 
>    	port ?
 
I guess you will need some sort of 10Base5 to 10BaseT converter. Sorry, I don't
know if they exist or if we sell them.
   
>    	A "virtual FDDI" backbone composed by a HUB900 with 2
>    	DECswitch 900EF module (all FDDI ports connected to the 
>    	backplane)

Yes you can connect 900EFs on the backplane with no external connections.
They will form an internal ring. This is true for all our 900 FDDI products
in any combination, limited by power requirements and backplane channels.


-Mike

    RE: .0
    Hi,

        I need an info on DECswitch 900EF. I've to know if this module
        it's a real bridge between a FDDI LAN and 6 Ethernet LANs.

      >>It's a real store & forward bridge between FDDI & 6 Ethernet LANs.

        How is it possible to connect a 10base5 segment to a 10baseT
        port ?

        A "virtual FDDI" backbone composed by a HUB900 with 2
        DECswitch 900EF module (all FDDI ports connected to the
        backplane) and up to 7 Ethernet segments to connect.
        So, I can connect 4 H4005 via drop cable to the 4 AUI ports,
        but how could I connect the other 3 segments ?

      >>So it looks like you wish to have an FDDI ring on the backplane,
      >>and connect the AUI ports of both bridges to H4005 via AUI
      >>drop cables. Yes as .2 stated, you can. So far so good. I'm not 
      >>sure what other 3 segments you are referring to. Now with all the 
      >>above connected, you have 8 10BaseT (8 pin MJ) UTP ports left over.

        The 10base5/10baseT transceiver has a male AUI connection,
        so I couldn't connect an H4005 to this transceiver.
        I should connect this transceiver to an ethernet bridge,
        but in this case I'll have a bridge to bridge connection
        and don't seems to me a supported configuration.

      >>So what you have are some other quantity of H4005 drops that
      >>you would like to connect to sme of the 10baseT UTP ports on
      >>the 2 bridges. Well, going from one LAN type to another is
      >>always going to be messy. There are devices out there which
      >>convert from one to the other. Black Box makes some of these
      >>devices, so getting a catalog is probably the way to go.
      >>Digital doesn't make devices like this that I know of either.
    
     - Bob   

    It would be really helpful in many configurations, to be able to
    connect ANY media type to the DECswitch900.   I would like to see a
    mod-pmd of some sort for Ethernet (the 15pin problem takes a lot of
    real-estate) perhaps on a connector like the DECbrouter, with an
    octopus cable running to six DB15 connectors on a 19" rack panel like 
    the DECnis has for it's line cards.
    
    I would have many applications for this flavor of the DECswitch900.
    
    Now, I suppose you would have to buy four repeaters to get the UTP
    ports out to the media that you need.   
    
    JR

    Hi,
    
    	Thanks to all people for these infos, But still I've a problem.
    	
    	Is it possible to connect a thickwire segment to a DECswitch 900EF
    	10baset port ? Or on these ports I could connect only computers ?
    
    	I've to substitute our Ethernet building backbone with an FDDI
    	one, at this backbone there are connected many floor segments.
    	So my problem is how many DECswitch 900EF I've to buy to connect
    	11 10base5 segments.
    
    						Thanks in advance,
    						Luciano
    	
    	

    I guess I do not understand what I get when I create a FDDI LAN in
    HUBwatch.  I moved both the A and B port to the internal net then I
    created two FDDI LANs and there was only one stub on the EF module to pull
    down to the the FDDI LAN, and it was labeled A.  I pulled the stub down
    to the first LAN.  Then went to the other EF module and move its A and
    B ports to the internal net.  Went back to configure and again only one
    stub labeled A, and I could only connect it to the second FDDI LAN. I
    did not think this was correct so I deleted them and turned the ports
    back.  The customer is not planning to do any FDDI in the near future.
    But for my own information, are those two FDDI rings linked internal
    and the A stub is both the A and B ports, so I actually had a dual ring
    configured internally?

Two things:

(1) Use the <HELP> pushbutton on the LAN interconnect screen.

THEN, and only after you have read the help, do the following...

(2) single-click on the switch icon at the top of the LAN interconnect screen.
    Then press the <CONFIG> pushbutton at the bottom of the LAN screen.
    Then, in the Station Config window, press the menu for the FDDI port.
    You will be able to select any of the following LIGO's...
	A out front-panel, B out front-panel
	A out backplane,   B out front-panel
	A out backplane,   B out backplane
	A out front-panel, B out backplane.
    Any of these configurations requires only one FDDI LAN.

Tom Hood
HUBwatch

    Maybe reading note #1597 may help, too.
    
    md