[comp.dcom.lans] Thinwire Ethernet cable lengths

pdb@sei.cmu.edu (Patrick Barron) (07/18/87)

We're trying to install a thinwire Ethernet, using DEC DESTAs to attach
stations to the network.  My question is:  is there a minimum distance
between stations with the DESTA?  With 6 foot cable runs between stations,
I see a lot of dropped packets, and TCP does a *lot* of re-transmission.
With a 20 foot cable, I don't seem to have much of a problem.

--Pat.

pdb@sei.cmu.edu (Patrick Barron) (07/18/87)

In article <1926@aw.sei.cmu.edu> I wrote:
>We're trying to install a thinwire Ethernet, using DEC DESTAs to attach
>stations to the network.  My question is:  is there a minimum distance
>between stations with the DESTA?  With 6 foot cable runs between stations,
>I see a lot of dropped packets, and TCP does a *lot* of re-transmission.
>With a 20 foot cable, I don't seem to have much of a problem.

Well, after more experimentation, it doesn't seem to be a problem with
cable length at all.  It turned out that the 6 foot cable I was using
was just plain bad.  We had never really thought to suspect the cable
itself, since it was sent to us by a vendor (who shall, for the moment,
remain nameless) as a "sample"!

So, that little problem appears to be solved.  I would still like to
see any comments people might have about the DESTA in general, though.

--Pat.