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| How does a security system connect to the telephone line? First developed in the early 1970's, digital communicators and regular telephone lines are a reliable and inexpensive communication method now used by the majority of monitored security systems throughout the USA. Your security system is designed to plug into a device called an RJ31X jack which is installed at your premises on one of your regular telephone lines. When activated, a relay in your security system "seizes" and gives the security system priority use of this line, allowing the security system to report its signals to the monitoring station's alarm receiver. The RJ31X jack is a special 8-pin telephone jack, designed for use with security systems, and which is available from your telephone or interconnect company for about $10, and you can install it. Sometimes an RJ38X jack is used instead of an RJ31X. The two types of jacks are identical except that the RJ38X jack has an internal jumper across two of its otherwise unused terminals. The jumper may be used with a tamper loop for local supervision of the wiring from the security system to the RJ38X jack. If your security system is presently monitored, an RJ31X jack is probably already installed. Monitoringis possible without an RJ31X jack; your security system can plug into a standard RJ11 jack for example, but your security system will not be able to utilize its telephone line "seize" feature. The RJ31X jack provides a method for quickly unplugging, and thereby disconnecting, your security system from the telephone line in the event a malfunction of your security system prevents or interferes with the normal use of your telephone and/or to assist in determining the cause or source of a suspected telephone line malfunction. |
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