Bell System 801 Door Entry Handset - White

Product Information

I should also point out the old handsets have an internal 'buzzer' within them, which buzzes when a visitor presses the Intercom.

x aforementioned circuit cables (looping either side of apartment building), each side using 4 coloured wires (1 wire for each apartment) & common red. Bell System was established in 1971 as a distributor and installer of door entry telephone and access control systems. In 1979 the installation business was rapidly overtaken by manufacturing following the introduction of its first door entry telephone. Since then the Bell System has firmly established itself as a leading manufacturer of door entry systems.On this model a switch is included on the side of the telephone to allow the user to mute the call-tone and prevent disturbances from nuisance calls. It had a speech unit (which allowed the 'resident' to hear the 'guest/visitor', and I assume the other way as well, perhaps?). The other coloured wires are present, but i now know that they feed the other apartments (see next point, Cabling).

Bells (BSTL) 801 series handset is installed in thousands of installations in the UK, being one of the most popular handsets available. 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/ The wiring is a 'loop' system feeding the left & right side of the building. (2 cables, 1 for either side) 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.Unfortunately, but unsurprisingly, the new unit didn't come with any wiring schematics - or indications that it required 4+1 wires.