DSC 632 1555MX & TLM troubles

You wouldn't by any chance be using "VOIP" would you???

50 VDC is more than adequate (above the threshold) for on-hook. Do you have any devices connected to the line that might drop the voltage such as FAX, Modem, or caller-ID units that might be acting flaky? Unplug them one at a time to diagnose it. Also check for oxidized wiring at the NID outside - (green copper). Make sure all the phone connections are good.

The off-hook voltage should be ~ 23V which leads me to think the device you tested it with may be drawing too much current (6.5 as reported is too low which will trigger the TLM). Test all the telephony devices one at a time with a voltmeter lifting each one off-hook.

The off hook voltage will normally be much lower than 23 volts, somewhere around 4.5 to 9 volts

Doug L

Check to see that the telco wiring to the control and RJ31X is wired properly. You might have the incoming telco wired to the premises side. js

Shit, you're right. I was thinking of the trip voltage of a Silent Knight TLM which is > ~23 V

Ok... Here is what I did this morning to test...

I disconnected the yellow/black pair coming out of the alarm panel and connected my butt-set directly to the panel on the return side. Within a few seconds of going off hook with my butt-set, the alarm goes into trouble and comes out of trouble when I go back on hook. I tested the voltage on both sides of the panel. I'm still getting 50v dc on both sides, but now I only get 5.5v dc when I'm off hook.

Also, after browsing the net I see that most people have a RJ31x jack before the alarm panel. My original installer didn't put one in. My telco line comes straight into the panel from the demarc.

Any ideas?

Jason

I can't believe you said that. It wouldn't dial out and he'd get an FTC

I disconnected the yellow/black pair coming out of the alarm panel and connected my butt-set directly to the panel on the return side. Within a few seconds of going off hook with my butt-set, the alarm goes into trouble and comes out of trouble when I go back on hook. I tested the voltage on both sides of the panel. I'm still getting 50v dc on both sides, but now I only get 5.5v dc when I'm off hook.

Also, after browsing the net I see that most people have a RJ31x jack before the alarm panel. My original installer didn't put one in. My telco line comes straight into the panel from the demarc.

Any ideas?

What's the delay set to in section 370 ?

Jason

Best thing to do is turn off TLM, DSC 's implementation isn't very good

It's called a "blonde moment" in real life.

It's called making a "Bass" in ASA.

That's the first I heard of that. I've got a lot of DSC panels out there and most have TLM enabled with *zero* problems. Must be the "US version" stuff, eh? :-)

ditto, I've extended the delay on the odd one, other than that, works well.

I'll never understand why they send the signals that didn't get through on an FTC restoral though. Stupid feature. Telco repairs a cut line and police respond after the fact. D'uh.

That's the first I heard of that. I've got a lot of DSC panels out there and most have TLM enabled with *zero* problems. Must be the "US version" stuff, eh? :-)

Do you happen to have a cordless phone? These will frequently drop the phone line voltage too low when you carry the phone either out of range on nearly out of range.

I could see that happen if the panel has sent a burg signal along with the FTC, they can't tell WHEN the burg signal occured

Having such low voltage from the line with only 1 telephone off hook is not normal..

Here with 1 telephone i have more then 16 volt,with 2 i have ~9 and with 3 stll 6 volt...

i am sure you have a low audio level on that line..cause you must have a too large resistance on the wiring from the telco,check for defective isolator at the phone entrance too..there is (here in canada) some kind of carbone surge protector on old line,those can make a lot of problem if they did receive a jolt...

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