On Thursday 23 Feb 2006 20:34, Colin Anderson wrote: > >It's stupid. Don't ever connect 2 different building with copper. > >Just wait until you get some kind of lightening hit or electrical > >fault, but make sure you are no where near it. Use fibre. > > Thanks for the reply. Unfortunately, the conduit for the provisioning of > the new building is unsuitable for fibre (too many sharp bends) and we > can't core out the concrete and put in a new conduit because of obstacles > in the way that make laying new conduit impractical, so we are stuck with > (existing) copper. We already have copper-to-copper connections of > different types (electrical, security etc) between the buildings so a > lightning strike is going to hose us no matter what.
In that case, put opto-couplers in place to protect both ends. Fibre/ethernet transceivers at both ends with a short run of fibre will protect both ends. Lightening strikes are only one problem, look to see what happens when one building attempts to ground itself through the copper cable to the other side. I would also question the legality of connecting both building with what I assume is mains electricity. B -- http://www.mailtrap.org.uk/ _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
