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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

1171.0. "HUB 900 Bandwidth" by SOUPER::COOPER (Ron Cooper) Tue Jun 28 1994 15:53

The Network Buying Guide and other lit. list the DEChub 900 backplane at > 3 Gb/s,
while the DEChub 900 Documentation rates the backplane at > 2 Gb/s.  One of my
customers actually read the documentation :^} and wants to know what the real 
story is.

Thansk,
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1171.1theory vs. practicality...NACAD::SLAWRENCETue Jun 28 1994 17:3519
    
    That's what you get for reading marketing literature... confused :-)
    
    Both numbers you quoted are theoretical numbers derived from different
    ways of combining the backplane capabilities; and both are equally
    irrelevant because they don't reflect what you can actually do.  The
    backplane is composed of passive etch that we use in a variety of ways
    to produce different network connections; future technologies will use
    that same etch for network types we have not even thought about yet.
    Some of those possibilities may include real bandwidth that high.
    
    A more usefull way to aproach the question is to look at the particular
    possibilities that might meet the needs of the customer ( 2 FDDI's + 6
    ethernets, 1 FDDI + 3 ethernets, etc ).  Then if you really care about
    numbers you can total the bandwidth of the configuration you built.
    
    With the current products, you could do 8 slots in 4 FDDIs, for
    400Mb/s; can anyone think of a real configuration that beats that now?