Interesting question. Tone dialing is set for each CO in the programming, which I did 30 years ago. But I just broke open the old installation manual, set the KSU to program mode, and verified that all three CO lines are set for tone dialing (Besides, having them set to pulse dialing might have interfered with dialing, but it seems like it wouldn't prevent me from getting a dial tone.).
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I'm really thinking that the line goes off hook when you plug it into the system for some reason. I wish I was there with a butt set to determine that. The other possibility is the system pulsing or dialing a digit when you go off hook. The digit could be out of spec for the other lines but not for the CO equipment on that line. Again, a butt set would tell.
But the question is why is whatever it is happening? Even if you can see what's happening how do you fix it? It's not something that you can complain to Verizon about because it's definitely not normal for a properly operating system. I suspect the age has everything to do with it. Those KSUs are cheap and if it were me I would just get a refurb (not used) and replace it. If the problem goes away you've fixed it. If not, return the KSU and keep scratching your head.
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
I'm really thinking that the line goes off hook when you plug it into the system for some reason.
But if that were true, wouldn't I not receive calls on that line? Incoming calls work fine.
It seems like the line goes off hook when I pick up the receiver, but then the CO immediately interprets something as an auto-dialed "1". After I dial 7 digits, I get the message "We're sorry. It's not necessary to dial a 1 when calling this number".
Let me think for 1/2 second. The 30810 is MD'd since 1990 something and unavailable for sale since Kari's law. It's hard to believe that a line doesn't work in position 1 2 or 3 and it's in the KSU, especially since the 3rd line always doesn't work.
I'd have a chat with the provider and beg/demand new hardware.
I'm really thinking that the line goes off hook when you plug it into the system for some reason.
But if that were true, wouldn't I not receive calls on that line? Incoming calls work fine.
Yes, I have to agree.
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It seems like the line goes off hook when I pick up the receiver, but then the CO immediately interprets something as an auto-dialed "1". After I dial 7 digits, I get the message "We're sorry. It's not necessary to dial a 1 when calling this number".
That's what I speculated above. Possibly the other lines are able to ignore it but not the third line. Different equipment? The system might cause a noise pulse that's interpreted as a "1" when it goes off hook. I believe there are relays for each line and they have to be at least 30 years old.
Again, I would want to listen in on the CO lines as the system goes off hook. That would give you the answer.
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
I borrowed a friend's Harris TS-21 test set, and recorded what the bad CO line sounds like going off-hook on the KX-T30810, and what the good CO line sounds like. I'll try to attach them here. I can't tell anything from those sounds, but maybe you can.
I also hooked up my oscilloscope in A-B probe mode and recorded the waveforms, but given noise and grounding issues I don't have a lot of confidence in what I'm seeing.
I hadn't checked the loop current, so I just did. It's about 23 ma when off hook on both the good and bad CO lines.
Incidentally, in the process of making that measurement I discovered that there is an inconsistency on the polarity of my three CO lines. The two good ones are different from each other. So I reversed polarity on the bad line, but it's still bad in the same way. I then reversed polarity on one of the good lines, and it still worked. So polarity evidently doesn't matter for the KX-T.30810.
Your scope shows the voltage between your test points isnt dropping as close to 0 on the bad pair as it does on your good one. This indicates a high resistance connection past your probes and closer to the unit trying to go off hook.
It's still an odd condition since the co is still breaking dialtone for you.