Pag. 21
Technical
General diagram for Door Phone installations with secret communication in buildings with one entrance.
The telephones will only be able to communicate with the outdoor panel if they have been previously called.
This prohibits calls to other telephones being heard by lifting up the receiver and also helps avoid acoustic
problems if any telephone has been accidentally left off the hook.
DIAGRAM SCHEMATIC
BASIC FUNCTION
Pushing a button on the outdoor panel causes a call signal
Cp1, generated in the amplifier, to be sent along the call
line to the corresponding telephone, which produces the
typical tremolo call tone. At the same time it will enable the
telephone audio circuits. Therefore the telephones that have
not been called will have their audio circuit disabled.
Upon picking up the receiver, a switch connects the
telephone to the common audio cables (2 & 6), making
contact with the outdoor panel.
Upon pushing the door release button on the telephone,
this joins the wires 1 & 3 of the installation, which in turn
causes the amplifier to activate the electric lock.
An additional common wire is required. See diagram.
MATERIAL NEEDED
In the dwellings
T1, T2, ...Tn Citymax Privacy Telephone Ref.: 8036
In the communal interior area
A7 Distributor Power Suply Ref.: 88231
In the street
P1 Outdoor Panels
Neccessary combination
F1 Electric lock Ref.: 2911
For other types consult catalogue.
E 1.2 DOOR PHONE SYSTEM
INSTALLATION WITH PRIVACY TELEPHONES 5+N
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