[ct-user] network update

[David Robbins]

yes, that is one problem with the coax connected network.  basically all the
cards run in parallel on the cable so if one card shorts to ground or sends
continuously it kills the whole thing.  there do seem to be fewer problems with
it than with the twisted pair cables in high rf environments though.  it is easy
enough to bypass a bad machine by just removing the t connector from the card
while leaving the two cables connected together.

Rick Dougherty wrote:
> 
> Woke up at 0430 this morning and went ight to work on the network
> problem...back to basics...found the 15m and 10m computers when linked
> would communicate...ie the network cards were ok...just started adding in
> computers until I found that the cards in the 20m and 40m computers were
> toast too...they were part of the origional 6 cards that
> probably got some sort of lightning damage...just guessing it was induced
> somewhere...in any case all 6 of the origional cards are history...I had 4
> spares and they are installed and working...will get another batch (they
> are fairly cheap) and will have enough for spares for the next time...whats
> interesting to note is that any one computer with a bad card can pull the
> whole network down...the system is daisy chained with rg-72 coax and
> terminating resistors at the two ends...it has been one of the biggest
> improvements in our multi-multi environment in the past 5 years...having a
> dependable and reliable network with an internet connection via
> DX-telnet...thanks to all who offered advice...de Rick
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-- 
David Robbins K1TTT
e-mail: mailto://k1ttt@arrl.net
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