Bell System 801 Door Entry Handset - White

Product Information

The other coloured wires are present, but i now know that they feed the other apartments (see next point, Cabling). Can anyone help me to identify which wires go where (Z T 0 R 1) on the new handset? Please see the images which include the existing wiring (photo and diagram) at //www.diynot.com/network/DIYJunkie/albums/

x aforementioned circuit cables (looping either side of apartment building), each side using 4 coloured wires (1 wire for each apartment) & common red. The wiring is a 'loop' system feeding the left & right side of the building. (2 cables, 1 for either side) However, upon installing it and trying to mimic the original wiring (from observing the original Intercom & speech module), it became clear that i needed more wires than i have (2 wires from each apartment) : ( I've just bought a replacement handset (Bell 801) for my door entry system. The existing phone that I'm replacing has 5 wires going to different parts of the handset but their destinations are marked A B C etc. It appears to be an old "Entryphone" handset It had a speech unit (which allowed the 'resident' to hear the 'guest/visitor', and I assume the other way as well, perhaps?).

Bell 901 | 1 Way Audio Intercom Kit with Surface Panel

Bells (BSTL) 801 series handset is installed in thousands of installations in the UK, being one of the most popular handsets available. The grill covering the speech unit does not compromise audio quality, and the speech unit is securely fixed to the rear of the plate, making for a great door entry system.

The kit comes complete with the 801 handset, which is one of the most popular handsets in the UK. Built from ABS plastic it is highly durable and with its smooth finish it is easy to keep clean. It is possible to have up to three handsets per button if required.Posting in this forum as my 'issue' is similar to the OP - and desperately hoping for a swift reply. In addition to the unit literally falling apart, the main issue was the fact that the caller couldn't hear the voice of the resident (using the handset in the apartment) while standing at the external Intercom (building entry door at street level). This issue increased the higher the apartments (the further away they were from the Intercom at street level).