Security Tips and Industry Musings

Security Systems communications

Lew Stouffer - Wednesday, April 23, 2014

Today, we have many methods for the security system to communicate with the monitoring center. The days of having to have a traditional land line from the telephone company are gone. It’s a field ripe with choices. I’ll touch on several of them and the pros and cons of each.

POTS- Plain Old Telephone Service, is a reliable form of communication. The POTS system allows voice transmissions through a direct wired point to point connection. The security system is connected to your existing home phones in a manner that will disable your phones temporarily in the event of an alarm condition that it needs to call out. After the communication is sent to the monitoring center, the phones will be restored for regular use. Some of the benefits of this system include no additional monitoring charges and reliable service. The drawbacks include the ease with which the service can disconnected (By a burglar or storm cutting the wires to the premises) and the need to insure that your security system is still functioning properly if ever there is service performed on your phone system.

VOIP- Voice Over Internet Protocol, is very similar to POTS system in the manner that they are connected to the security system.  The major difference between POTS and VOIP is how the voice signal is transmitted. The VOIP system utilizes a portion of the bandwidth available from your internet service to send its signal. They are not recommended for security system use. There seems to be a wide gap in ability to use these systems for security systems between the different providers. The basic rule of thumb that we have seen is the old adage of you get what you pay for. The less the VOIP system costs the less likely it is to be able to transmit alarm signals reliably. These systems have the same limitations as a POTS system with the added problem of needing a battery backup to work in power outage conditions. Additionally, if you have service performed on your phone or data network it is possible to affect the security systems connectivity.

Internet Monitoring- Utilizes the current internet bandwidth to transmit signals to the central station for security system monitoring. It has the drawbacks of being easily defeated by cut wires or power outages (as in the above examples). The costs involved are similar to a primary cell system (below) because of the need to purchase an internet module and server time.

Cellular Monitoring- Also popularly known as wireless. A cellular system requires the purchase of a cell communicator that is designed to work with the security system. It is essentially a cell phone that is mounted with the control panel equipment. Like all cell phones there are airtime fees involved to keep the system active. The advantages are that they are completely independent of the other systems on the premises. They are not subject to cut wires and are connected to the security systems back up power supply in the event of a power outage. They do suffer, to a lesser degree, from some of the same issues as cell phones.