RJ31X / CA38X Telephone Wiring Information

RJ31X / CA38X Telephone Wiring Information

Your alarm system likely came with a cable & jack set for connecting your alarm system to the telephone system in your home.  Particularly if you are having your security system professionally monitored, it's critical that the alarm can ALWAYS get a dial tone and call out to alert the station to an alarm condition or problem.  The purpose of the RJ31X (AKA CA38X in Canada) is to allow the alarm to temporarily disconnect all of the phones in the home even if someone is using them or one is 'off hook' so the alarm can get a dial tone and call out.  Also if you need to disconnect the alarm you can unplug the cord from the jack and the house phones will operate as normal.

It looks scary but it's really not. 

The wire portion is going to connect to your alarm panel, matching the wire colours to R1, T1, RING and TIP.  Only 4 wires are connected to the panel.

The terminals on the box are used to connect your incoming phone line (R, T) and then back to your home phones (R1, T1). Only 4 screw terminals are used.  In from the outside phone line, back out to the home phone feed.

Follow the diagram below.


    • Related Articles

    • Wiring Simon XT To Telephone Line

      The manual for the Simon XT suggests that there is a cord in the box that can be used to connect the Simon XT to your house phone jack.  There is a cord but in reality most people have a standard RJ11 jack and not an RJ45 jack for their phone ...
    • Wiring / Connecting 2 Wire and 4 Wire Smoke Detectors to an Alarm System

      We are often asked how to connect low voltage smoke detectors to a wired alarm system.  First we need to point out that smoke detectors are a life safety product and so it's critical that you read and understand how the connection should work, and ...
    • Wiring and Cabling Considerations for a New Home or Renovation

      While building you're best to put in more wire than you think!  CAT5E is your friend for many applications including networking, telephone, whole home audio, intercoms and more. You may want to consider lighting control wiring (120V electrical), ...
    • X-10 or Insteon Devices Not Communicating

      Powerline (eg. X10, Insteon, UPB) automation signals travel along the household power wiring.  There are two main issues that can affect performance.  One is that your house electrical system is split in to 2 phases at the breaker panel.  The other ...
    • Elk Webinar Product Information & Training Sessions

      Elk has recorded hours of webinar training sessions and instructional videos that cover hardware, product information, integration and programming.  You can visit their Youtube channel:  Elk Webinar Recordings.