i just installed alarm panel in a large residential estate, i used the pabx extentions of the houses to communicate with the cms, i noticed that when the alarm panel is connected the telephone line will not ring out.i check the out voltage it was low, this was due to distance. Is there any device I can use to improve the voltage on the lines to make the phones ring out?.
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telephone not ringing out
- Thread starter eti232027
- Start date
Mountainbear
Programmer
Check with Viking electronics. They have ring boosters.Not sure if this is what you are looking for.
- Thread starter
- #3
jrgood0852
Technical User
Another company you might try is RDL. Not sure if they have what you need for this application, but worth a look.....................
Always look out for the next tech. because one day it will be you!
Always look out for the next tech. because one day it will be you!
- Thread starter
- #6
What country are you from? If UK you will need to have balun or socket with a resistor in it (other countries may be the same). Tend to be refered to as Master baluns or master sockets.
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- #8
You don't say what type of phone system you are connecting to
You could be trying to connect to a digital extension or IP?
As mforrence says it maybe against local regulations to put the alarm through a phone sysytem, if you have to put it through a phone system i would try and pick a power fail extension and configure the extension as a hot line or something so the alarm panel could dial out in both situations (powered and non powerd telephone system)
Could be embarrasing at least if you get this wrong![[blush]](/data/assets/smilies/blush.gif "[blush] [blush]")
You could be trying to connect to a digital extension or IP?
As mforrence says it maybe against local regulations to put the alarm through a phone sysytem, if you have to put it through a phone system i would try and pick a power fail extension and configure the extension as a hot line or something so the alarm panel could dial out in both situations (powered and non powerd telephone system)
Could be embarrasing at least if you get this wrong
- Thread starter
- #10
curlycord
Programmer
What I meant by does not ring out is that when there is an incoming call the telephone handset does not ring out"
Thanks for the morning chuckle!!
Will just assume you mean the device does not "ring" then.
7 questions...
-What PBX system is it?
-How are you exactly wired up to it? what interface if any are you using with the PBX?
-With the alarm disconnected - how many volts when idle?, how many volts when ringing?
-With the alarm connected - how many volts when idle?, how many volts when ringing?
Best to sort this out in case the carrier has an issue sending voltage or an ATA device or the Alarm box has issues.
One test is to wire up the alarm direct to a line without the PBX.
=----(((((((((()----=
curlycord
Toronto Canada
Thanks for the morning chuckle!!
Will just assume you mean the device does not "ring" then.
7 questions...
-What PBX system is it?
-How are you exactly wired up to it? what interface if any are you using with the PBX?
-With the alarm disconnected - how many volts when idle?, how many volts when ringing?
-With the alarm connected - how many volts when idle?, how many volts when ringing?
Best to sort this out in case the carrier has an issue sending voltage or an ATA device or the Alarm box has issues.
One test is to wire up the alarm direct to a line without the PBX.
=----(((((((((()----=
curlycord
Toronto Canada
- Thread starter
- #12
Thanks Curlyword,
the answers are as follows:
-What PBX system is it? alcatel omnipcx
-How are you exactly wired up to it? one pair cable connection. what interface if any are you using with the PBX? no interface
-With the alarm disconnected - how many volts when idle?, how many volts when ringing?39.5v
-With the alarm connected - how many volts when idle?, how many volts when ringing? 40.6 v
Thanks this what I have done so far
the answers are as follows:
-What PBX system is it? alcatel omnipcx
-How are you exactly wired up to it? one pair cable connection. what interface if any are you using with the PBX? no interface
-With the alarm disconnected - how many volts when idle?, how many volts when ringing?39.5v
-With the alarm connected - how many volts when idle?, how many volts when ringing? 40.6 v
Thanks this what I have done so far
jrgood0852
Technical User
Ring generator should be in the neighborhood of 90VAC. The voltage you describe sounds like dial tone voltage and I bet that is DC. Please clarify.
Always look out for the next tech. because one day it will be you!
Always look out for the next tech. because one day it will be you!
- Thread starter
- #14
- Thread starter
- #15
I saw this link through google does anyone knows if it can work?.
This is pretty basic stuff as far as telecom goes. When you connect the set to the PBX, you should measure about 48V DC. This is normal and so is a bit of a drop if the loop is long. The alarm "line" you refer to should be connected onto a trunk port of the PBX (this is normal too). Alarm installations usually have special jacks for this. The alarm line shouldn't have anything to do with the station you're talking about.
When you dial that station's extension number, the PBX port should send 90V AC to the set to activate it's ringer. It's ok for it to be a bit less on a long loop too. It should be easy to measure with a meter and test. Just dial the extension number......the set should ring and you should be able to answer the call. Even is the voltage is too low to activate the ringer, you should still be able to answer the call just by picking up the handset.
If you're trying to connect to one of the alarm panel's sensors, then that's a different story! It's simple......you can't do it! In fact, you're likely to damage the alarm system by running 90V AC to it.
If you don't understand the concept of what I'm talking about, you might want to get a qualified telecom tech out to give you hand.
When you dial that station's extension number, the PBX port should send 90V AC to the set to activate it's ringer. It's ok for it to be a bit less on a long loop too. It should be easy to measure with a meter and test. Just dial the extension number......the set should ring and you should be able to answer the call. Even is the voltage is too low to activate the ringer, you should still be able to answer the call just by picking up the handset.
If you're trying to connect to one of the alarm panel's sensors, then that's a different story! It's simple......you can't do it! In fact, you're likely to damage the alarm system by running 90V AC to it.
If you don't understand the concept of what I'm talking about, you might want to get a qualified telecom tech out to give you hand.
- Thread starter
- #17
Measure the AC voltage and the current. You might even want to check the ringer on the set if there is sufficient AC voltage. Try connecting the set back at the PBX port and ensure the ring generator is working on the PBX side.
If everything checks out, you could try doubling up on the cable pairs going to the set (assuming you have extra). If not, then that Sandman unit will likely do the trick..........it's all a matter of that 90V AC! That's what makes the phone ring.
If everything checks out, you could try doubling up on the cable pairs going to the set (assuming you have extra). If not, then that Sandman unit will likely do the trick..........it's all a matter of that 90V AC! That's what makes the phone ring.
- Thread starter
- #19
OzzieGeorge
Programmer
Did the phone ring before you connected the alarm? you still haven't told us which country you are in. The UK has a system where the capacitor for the ring circuit (not a resistor) is in the master socket and from there to the secondary sockets, it is a three wire circuit. The third wire carries the ring current so if you have somehow taken the master socket out of the circuit none of the phones will ring as they have no capacitor in them.
Another possibility is that you have exceeded the maximum REN the PABX is capable of driving so try less phones (especially if they have a fax as these are usually high REN). But then again the alarm panel may just be faulty (Capacitance to earth so the ring current is going to earth, it may work if the line is reversed).
Another possibility is that you have exceeded the maximum REN the PABX is capable of driving so try less phones (especially if they have a fax as these are usually high REN). But then again the alarm panel may just be faulty (Capacitance to earth so the ring current is going to earth, it may work if the line is reversed).
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