On Fri, 2011-07-22 at 10:58 -0700, Dave Platt wrote: > > They've got a bunch of Grandstreams that seem to be rock solid... until > > 7:00pm. At 7:00, some of the phones become unavailable, and stay down. > > Call > > quality is solid almost all the time. But right at 7:00, things go bad. > > Only > > some of the phone lines go down and they stay down until the phone is > > rebooted. > > > > I'm not even sure what to look for when I go to the site. Any ideas? > > I'd look to see if there are any electrical circuits (lights, > fans, etc.) which are on a timer of some sort, and are automatically > powered off at 7 PM. > > If somebody mistakenly plugged a piece of network kit into such a > circuit, it would lose power at that time, and your network might > end up being partitioned, or routing (switch or IP-level) might > change abruptly. >
Hi, Even if there is no equipment you own controlled by a timer, you still can suffer from it. Some power companies have different rates for power you use during daytime or at night. So even if _you_ don't have equipment on a timer, your neighbours might have. Something like electrical boilers or so, or other "heavy equipment". Switching them on/off can cause huge spikes on the electrical wires. A couple of neigbours at work have their own micro-power-generators. About one in ten times, when they start delevering power to the grid, all of our test-systems go down. Only the systems behind the re-generated UPS (that removes spikes from the powerlines) are protected against them. So nasty litte spikes are harder to detect/tracedown than a full blackout. hw -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users