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Our customer installs domestic alarm systems and was finding that the installation was often proving difficult and unsightly. Key problems centered around the need to install a CE marked marked power supply, BT style master termination box in older properties, repeater relay plus the option to use the power supply to charge storage batteries. The original customer generated solution was based on fitting a number of separate boxes and then wiring between them.

 

A new solution was designed by Impel that incorporates all of the required features in one simple to install unit based on the readily available 47mm deep 2 gang pattress box. When installed the unit blends in very well with all the other electrical fittings in the house.

 

In the picture you can see a red coloured part, this is the jumper that can be moved to switch the unit up to battery charger output.

One key issue that we had to resolve was the need to design an ADSL filter that could be connected to the telephone line adjacent to any other ADSL filter without affecting the ability of the network to support dual tone dialing which had proved to be a problem with certain tone combinations being blocked. After many calculations and tests we produced a filter with a front end resistive section to avoid reactive issues with other external filters.