Is the system plugged into a UPS? I've had some VERY strange problems when I tried to run TD boxes on certain UPS's. Good luck! Jim ----- Original Message ----- From: "Dushyanth Harinath" <[EMAIL PROTECTED]> To: "KX-TD500 Help" <kxt@kxthelp.com> Sent: Friday, December 02, 2005 4:37 AM Subject: KX-T: KX-TD500 ringing problem
> Hello all, > > We have a KX-TD500 with a basic shelf + expansion shelf. We have about > 20 ESLC + 2 LCOT + 1 DHLC + 1 PRI + 1 CPU + 1 TSW cards configured on > the TD500. > > For the past two weeks we have been facing some weird issues with the > expansion shelf. > > 1) At first on all the extensions configured on the expansion shelf, we > couldnt hear the phone ringing properly on incoming calls i,e the ring > was all broken & erratic. This problem later matured and there was no > ring at all on incoming calls. Panasonic engineers who worked on this > issue said there was some problem in the ringing circuit of the power > supply. So we shut down the expansion shelf and sent the power supply to > the service center for repair and later replaced with a new one. > > 2) During this we had to get some extensions on the expansion shelf > configured on the lower shelf because the expansion shelf extensions are > used for some of our critical departments. So we removed the amphenol > connectors connected to the expansion shelf and connected them to the > cards on lower shelf and reconfigured the needed extensions on them. > > This worked for a day and later the basic shelf power supply stopped > working. The power supply's LED started ticking (tick..tick..tick..) > everytime the TD500 was powered on and the system failed to start. > > So, again this power supply was replaced with a different one by the > panasonic engineers. > > 3) Now, we have both the power supplys of TD500 functioning and the > system starts up properly with all extensions working. But after 6 to 8 > hrs after powering on the system we are observing the same ringing > behaviour on all the extensions of the expansion shelf. > > 4) Shutting down the system and powering it on after a few minutes > solves the problem for a while i,e all extensions/phones configured on > the expansion shelf ring properly. > > 5) Nobody seems to have a clue on what the exact cause is and is turning > out to be a wild goose chase. Below are the some of the guesses that we > have heard from the panasonic engineers. > > a) The power supply on the expansion shelf is not able to handle the > load of all cards. > > b) There is some magnetic induction from the field side i,e from the > extensions side to where the phones are connected to. Could be due to > power wirings and telephone wiring for the office going through the same > conduit. We have verified the same and both the power wirings and > telephone wirings use different conduits. > > c) Could be a short-circuit due to one of the ESLC or LCOT cards > connected to the expansion shelf. We still need to verify this by > systematically testing extensions on each card the next time the problem > occurs. > > d) Could be a connection problem from the basic shelf to the upper shelf. > > e) Could be a problem with the expansion shelf mother board. The mother > board was completely cleaned and serviced today. We havent found a way > to verify this part yet. > > f) Word from the panasonic service center is that some transistors on > both the power supplys (the faulty ones which were later replaced) > failed and they suggested b), c) & e) could cause this problem. > > Iam no telecommunications expert and at a loss here in identifying the > cause of this problem. Has anyone else using KX-TD500 faced similair > issues ? > > All suggestions are welcome and iam all for trying those out. > > TIA > Dushyanth > > > _________________________________________________________________ > KX-T Mailing list --- http://kxthelp.com/ > Subscription changes: http://kxthelp.com/mailman/listinfo/kxt > _________________________________________________________________ KX-T Mailing list --- http://kxthelp.com/ Subscription changes: http://kxthelp.com/mailman/listinfo/kxt
