x x wrote: >I have wanted to post the following problem for a while but thought it was >more of a wiring problem as opposed to a phone problem. With the recent posts >I've seen, it's clear there are some members with expertise in wiring and so >here goes. > >We have a KX-TD1232 installed with 32 extensions and 7 COs. The extensions >are KX-T7433 and 7435 and are spread across 3 buildings with the TD1232 in the >central building. The extensions all use a single pair on the digital >connection. > >The extensions in one building do not work properly on some functions like >speakerphone and they don't work at all when we are on battery backup. I >traced the problem down to a voltage drop because the phones are so far away. >They are 800' from the TD1232. The voltage at the extension is around 5 volts >and so it is amazing they work at all. Anyway, the cable that was run when >the system was installed is 50 pair 24 gauge underground in a conduit. The >Panasonic manual says that we should have 22 gauge for that distance. In an >attempt to reduce the voltage drop, we tried doubling up two pair of the 24 >gauge wire (we have spares). What we found is that no matter how we double >the pairs, the phones won't work at all. The voltage is much closer to 12 >volts but there is just a constant ticking sound in the handset and the phone >won't work. We tried use one pair on one side and another pair on the other >side and that didn't work. We tried using one wire from each pair doubled and >that didn't work. Using 2 pairs does certainly reduce the voltage drop but >the extension doesn't work at all. Any ideas of why this won't work? Thanks >for any advice you can give. Tom. > >
Turn off the backlight. Paralleling pairs increases capacitance that will kill the 74xx. Cat5e will have lower cap and helps. Make sure the cable starts at the ksu and ends at the set. one port connected to two cables to two jacks, unterminated cable will cause swr and mess up the connected set. (done to allow a pits at one place and a slt at another place on the same port) you can usually get away with a 70xx set since the voice is on the first pair, and the digital signal doesn't have the high speed digitized voice. (if only have prob at a few distant sets) There is also the add a small series supply at the set end. the old loopextender ;-) idea I still don't like. good luck -larry / dallas _________________________________________________________________ KX-T Mailing list --- http://kxthelp.com/ Subscription changes: http://kxthelp.com/mailman/listinfo/kxt
