pfh@pai.UUCP (Peter Hill) (09/16/88)
We use Ethernet (actually 802.3) to connect PCs and Unix workstations
in factory environments. We tell our customers to run the Ethernet
trunk cable in conduit away from high-voltage power cables or large
motors.
Now we have a requirement to wire several floors of a building. We
have no options for running the trunk cable between floors: it will be
in conduit, near other conduit carrying 480VAC power cables. This will
be a long vertical run, parallel to the power cables. We can't get
much separation, certainly less than a foot, perhaps only a few inches.
Anybody have any experience with this kind of setup? Any suggestions?
(Even screams of "Don't do that!" would be appreciated.)
Thanks in advance.
--
______________________________________________________________________________
Peter Hill pfh@pai.mn.org +1 612 894 0313
Prime Automation, Inc. ...{sun!tundra,umn-cs!hall,bungia}!pai!pfhPLS@cup.portal.com (09/18/88)
Have you though about using a fiber optic backbone and a repeater for each floor? ++PLS
grr@cbmvax.UUCP (George Robbins) (09/19/88)
In article <183@pai.UUCP> pfh@pai.UUCP (Peter Hill) writes: > > We use Ethernet (actually 802.3) to connect PCs and Unix workstations > in factory environments. We tell our customers to run the Ethernet > trunk cable in conduit away from high-voltage power cables or large > motors. > > Now we have a requirement to wire several floors of a building. We > have no options for running the trunk cable between floors: it will be > in conduit, near other conduit carrying 480VAC power cables. This will > be a long vertical run, parallel to the power cables. We can't get > much separation, certainly less than a foot, perhaps only a few inches. As long as the power cables are in conduit you will probably be ok, especially if you are also in your own metallic conduit. Also pay attention to grounding your backbone cable shield in one and only one place. In the unlikely event that you have problems, there are various flavors of fiber optic repeaters and bridges that are theoretically immune to such difficulties.. -- George Robbins - now working for, uucp: {uunet|ihnp4|rutgers}!cbmvax!grr but no way officially representing arpa: cbmvax!grr@uunet.uu.net Commodore, Engineering Department fone: 215-431-9255 (only by moonlite)