Conference netcad::hub_mgnt

3063.0. "Connect 2 Ethernet LAN distant 3 kilometers?" by COWBOY::MIRGHANE () Tue Dec 12 1995 17:55

    We have to connect 2 *2 Ethernet networks distant 3 kilometers.
    The solution we have proposed is a multimode fiber connection based 
    on 4 LANbridge 200. 2 LANbridge connect 2 Ethernet LAN.
    However the LANbridge 200 is now in maintenance only and we cannot sell
    it anymore.
    
    We then have thought of using a DECswitch900EF instead of the LANbridge
    200 connecting the 2 Ethernet with FDDI. 
    Our problem is that this solution is too expensive mainly if we use SMF 
    cables (the SMF ModPMD is really too expensive and we need 8 of them  to 
    connect the 4 DECswitch900EF 2 by 2)
    
    Our customer is really angry and looking at competitive solution 
    AND WE NEED HELP.
    
    1/Is there another solution TO CONNECT 2 Ethernets distant 3 Kilometers?
    If yes how?
    
    2/If not and Since we only transport ETHERNET (10 Mbps) between the 2
    DECswitch900EF can we use Multimode fiber FDDI to cover the 3 kilometers??
    
    
    Thanks very  much for an urgent help.
    
    
    Regards.
    Soumetty.
            
                                                           

    I would connect an optical Transceiver to each AUI port of a DECswitch
    900EF on each side of the link.  (Dont use FDDI, since it won't like
    the distance)  The optical transceivers should come from a vendor who
    supports long haul fiber links, using hig power optics.  (Chipcom has
    such transcevier).  These will push your ethernet data over a 3Km fiber
    between two bridges.  
    
    JR

    ANd, if the cost is a real issue - use a 900EE which lowers the cost by
    4k....2K at each end...
    
    Note that the benefit is that the customer can do MORE SWITCHING with a
    6 port switch.
    
    However, i'd go for FDDI for a fuller bandwidth at each end...i.e. they
    can do high powered FDDI servers on the DECswitch 900EF etc....and
    locally do lots more switching...
    
    j

    Thanks very much for this help. The customer has chosen the optical
    Ethernet solution.
    
    Soumetty.