Intercom
Both Intercoms and telephone entry systems are a means to
communicate with someone inside a protected area. The caller
initiates the call via an exterior mounted call box. The resident
then has the option of releasing the door for the caller or simply
hanging up.
The
biggest difference between the 2 systems is the wiring. A
telephone entry system requires power and a telephone line to
allow it to operate. It can dial any programmed phone line, even
cellular to release the door. An intercom system has wiring
run to each and every location that needs to communicate to the
door. A phone must be mounted inside the apartments or offices in
order to talk to the visitor and to release the door.
Both telephone entry and intercom systems can be equipped with video
to allow the receiver to verify the identity of a caller before
releasing the door. The video from the intercom can be modulated,
which allows residents to see the visitor on their TV. |