Jim Lux <[EMAIL PROTECTED]> wrote > Quoting "Robert G. Brown" <[EMAIL PROTECTED]>, on Mon 28 Jul 2008 > 06:15:44 AM PDT: > > > On Mon, 28 Jul 2008, Eugen Leitl wrote: > > > >> On Sun, Jul 27, 2008 at 07:19:56PM -0700, Jim Lux wrote: > >> > >>> bear in mind that ordinary ethernet both coax and twisted pair is > >>> galvanically isolated. > >> > >> This is strange, because I've seen (small) sparks and received (mild) > >> shocks from both, in two different locations. > > > > Ground loop. Very dangerous. You go first...;-) > > > > rgb > > > Very odd.. I'd be looking for an outright short from the cables to > something (or, a LOT of capacitive coupling)...
Could this possibly be static electricity discharging? Is the humidity very low where this is being seen, and or, is the operator moving over carpet shortly before the spark is observed? I can't say that I've ever seen sparks leave an ethernet cable even here in Pasadena when the winter humidity is close to zero, but I have had sparks jump off my fingers as they passed near mounting screws on wall plates. In spark season I routinely get blasted by my car's door handle, and there's definitely no ground loop going on there. David Mathog [EMAIL PROTECTED] Manager, Sequence Analysis Facility, Biology Division, Caltech _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
