Reducing alarm triggering during decadic dialling.

Jumper J4 is used to select either "normal" or "reduced tinkle" operation. The default setting is "normal" with the link bridging the bottom two pins (position B). If "reduced tinkle" operation is required the link must be moved so that it bridges the top two pins (position A). The "normal" position is used for the majority of installations.

jumper saetting for reduced tinkle operation

Further details are available in the product's installation instructions.