Home alarm system telephone wiring

Central station reporting

  1. Related Products
  2. Monitoring Plus - Burglar alarm and phone line wiring
  3. Structured Home Wiring
  4. Fire Telephone Systems
  5. Why does my broadband drop out?

Related Products

If you have dial tone, it's probably time to call us and scheule a service call. If you do not have dial tone, it's time to call the phone company, but keep reading. Now we need to get ready for the phone company to come a calling because when they see that alarm sign in your yard they are going to "know" instantly what the source of the problem is, it's something in the alarm system causing the problem, call your alarm company.

In preperation for their arival you need to locate your alarm panel. No, the alarm panel is not the keypad, it's a putty colored box that is usually mounted in a closet or utility room.


Monitoring Plus - Burglar alarm and phone line wiring

It's where all the wiring from your doors and sensors and connected. Once you've located the panel, open the door by removing the 1 or 2 screws that are holding it shut. Inside you will see something that we refer to as an RJ This is a beige color plastic box that has a phone jack in it.

Unplug the phone jack from this box and leave it unplugged until the telphone company has completed their work. What is an RJ31 and why did we unplug it?

Structured Home Wiring

That phone wire that we ran from the panel to the box outside is connected to the RJ31, the plug that you removed from it is connected to the alarm panel circuit board. Inside the RJ31 are two shorting bars and when you unplug it, those shorting bars connect the red wire to the black wire and the green wire to the yellow wire. So what you have done is remove the panel from your phone line and now the dial tone comes from the box outside to the RJ31 and is sent right back outside to the phone box. Now if the phone repairman tells you that the problem is in your alarm system, you can tell him that the alarm system has been unplugged and can't be the source of the problem.

This doesn't mean that there isn't a problem with the alarm panel, but we'll get to that later. Why does the phone repairman often blame the alarm panel?

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Well, it's because they don't understand what the panel does in reguard to the phone line. What happens when the phone line goes dead is the panel says "hey, I need to call someone and tell them about this", but guess what, there is no dial tone and it can't call anybody so it puts that call in memory so that it can report it later when it gets a working telephone line. Now here comes the telephone repairman, he repairs the problem, the panel see's dial tone and says "alright!

I've got dial tone so I'm going to call in and tell the monitoirng computer what I have in memory".

Fire Telephone Systems

So what happens? The panel seizes the line, making all the phones in the home go dead. The repairman see's this and disconnects the line, yep, he still has dial tone so he hooks the line back up, the panel see's dial tone again and repeats the process, and the repairman repeats his process.

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Eventually he decides that there is a problem with the security panel, cuts the wires going to it and tells you that there is a problem in the alarm panel and that you need to call your alarm company. If he would have hooked up the line and given the panel 60 seconds to do it's thing, the panel would have returned dial tone to the home and everyone would have been a happy camper. By unplugging the RJ31 you have eliminated this process.

Now that the phone company has left and the phones in the home are working, it's time to go back to the panel and plug that RJ31 back in. Burglar alarm systems typically report events to central monitoring stations by placing phone calls using you normal phone line. However, there is a potential problem with reporting events over the phone. Normally alarms have an entry delay to give someone sufficient time to disarm the alarm before it goes off.

DSC NEO Installation - Step by Step

The problem is, this gives a burglar enough time find the phone, pick it up, dial some random number, and leave it off the hook. Now when the alarm tries to place a phone call after the entry delay , it finds the phone already in use and can not report the break-in. To overcome this problem alarms have a line interruption feature. Before dialling to report an event, the alarm interrupts the phone line, effectively disconnecting all the phones in the house, and freeing the phone line for the alarm to place its call uninterrupted and report the break-in.

For this feature to work, the alarm must be wired correctly.

Why does my broadband drop out?

The phone line must first come into the main alarm panel before being distributed to the rest of the house, as shown below. ADSL is a common method of delivering high-speed internet over the same cable used for the normal phone line. The same cable can be used because the ADSL signals use a different frequency band to normal phone calls.

For both systems to co-exist happily, filters must be used to separate out the two signals, otherwise when a phone is picked-up, it will interfere with the ADSL signal, causing the internet connection to go down. Typically people who have ADSL broadband internet choose the self install option to save money. This involves placing filters on every phone in the house as shown below, so when they are used they do not interfere with the internet.

Of course, with this standard set-up, when the alarm reports an event it not only disconnects the the phones, but it also disconnects the ADSL internet.