Having said that, there are certain things that controller cards.
transceivers, and hubs can be made to do. One of them is called
"heartbeat". Basically, this appends a deliberate "smurch" after
each data packet transmitted. It is "junk" transmitted while ignoring
any resulting collisions. It is supposed to have some beneficial
results. Most all DEC transceivers have this built-in. The result
of having one of these things in-line is that downstream hubs may
interperate this smurch of junk as the residual of a collision.
The 3COM boards don't do this by default. However, I think there is
at least one that can have its "heartbeat" turned on with the
DOS-based setup utility that comes with the board.
If your collisions are not caused by a heartbeat somewhere, you
should make certain that, if your Network is coaxial cable, you
do not allow the shield to be grounded on any workstation. The
BNC Connectors are not connected to chassis ground. If they were,
you can get "ground-loops". Note that there may be a 10-20 volt AC
difference in potential between a "ground" at one end of a large
building and a "ground" at another.
Cheers,
Dick Johnson
***** FILE SYSTEM MODIFIED *****
Penguin : Linux version 2.1.85 on an i586 machine (66.15 BogoMips).
Warning : It's hard to remain at the trailing edge of technology.
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