Video Intercom System

Overview

A video intercom system lets a resident see, speak with and admit a visitor at a building entrance without going to the door. The visitor presses a call button at the entrance; an indoor monitor rings, shows live video of the caller, and a single touch releases the door lock. It is the standard access-control front end for apartment blocks, offices and gated houses.

How it works

At the entrance is the Door Station, a weatherproof flush panel built into an IP54 die-cast housing behind a vandal-resistant faceplate. It carries a wide-angle Entrance Camera Module with infrared illumination for night-time caller identification, a Call Button & Keypad Panel of apartment call buttons and a backlit PIN keypad, and an RFID Reader for keyless entry by credential holders. A door-station main board runs the SIP / 2-wire stack, encodes the video, manages echo-cancelled audio and holds the access logic.

Calls are answered at the Indoor Monitor. Each wall-mounted unit pairs a colour touchscreen with a controller that decodes the door-station video off the bus, drives the display and runs the duplex intercom audio; talk and unlock are single-button actions. The system ships with two monitors so a call rings at more than one point.

Power and data are split out by the Power & Bus Distributor, a DIN-rail board that feeds the door station and each monitor over the Bus / Network Wiring riser with a resettable fuse on every branch. When a resident grants entry, the door-station relay drives the Electric Door Release, a fail-secure electric strike mortised into the frame that holds the door shut on power loss and releases only when energised. Because the bus and power lines run outdoors, an in-line surge protector clamps lightning and switching transients before they reach the electronics.