It looks like my early model KX-TA624 is indeed the problem, after all,
as far as my "reboot when ringing a single-line phone" problem goes.
So far, on my KSU:
"Good" Trimline alone: works OK.
WECO 302 set alone: works OK.
Cheap Chinese electronic phone (ringer equivalence 1.3B!): works OK.
GE-branded (Thomson) electronic phone: works OK.
AT&T-branded (Philips) answering machine+phone combo: works OK.
Zoom V.92 external voice/fax/data modem: works OK.
"Bad" Trimline, on two-conductor cord: system reboots randomly.
WECO 2500 set, on two-conductor cord: system reboots randomly.
"Good" Trimline and 302 on separate ports: if both are ringing, I get
reboots, even though the KSU never rings the two phones simultaneously.
Panasonic proprietary sets have no problem, even with five of them going
at once.
On the -5 at work:
Every single one of these phones works fine, and if they are all set to
ring on an incoming call, they ring simultaneously and the system still
works fine.
Given that the Chinese cheapie works fine with its surprisingly high
REN, my guess is that there is some sort of inductive effect (spikes?)
being generated by the ringer coils on the "bad" phones, and that the -5
was given a design tweak to deal with the problem. Maybe a better power
supply and/or spike suppression? It's also interesting that the newer
model rings everything simultaneously.
I guess I'm going to look for a -5 and get rid of the old model.
Russ
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