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These 4 technologies are available in a range of panels. We show the common 1 and 2 button sets, but panels can be built with over 20 buttons. Keypads are a common requirement, but consider card access, or dial to open options.
Wired audio intercoms
Basic audio intercoms are wired in alarm cable or Cat5 cable. The handsets use four cores, plus 1 for additional buttons handset used. A Cat5 is sufficient for 1 or 2 button panels with a keypad.
Various finishes are available. Modular panels may have over 20 call buttons. Allow an extra core of cable per call button over 2.
Wired video intercoms
Most video monitors now connect to the entry panel by 2 wire. Cat5 cable is acceptable up to 50m, but a 2 core data cable should be used. The PSU and lock can use the same 2 core cable, though check the lock requirements for PSU.
Various finishes are available. Modular panels may have over 20 call buttons. Each 2 wire monitors wires to the entry panel. On 2 wire digital bus systems, all components (except lock) can be wired together.
Some systems are able to separate the camera from the panel, or have an extra panel. This can give a better or more relevant view of the caller.
GSM - Wireless audio intercoms
GSM intercom panels are mobile phones built inside an entry panel. They need only a power supply. When the call button is pressed, it calls the stored number (the householder). If the landline is busy, or unobtainable, it calls a 2nd number, and even a third. Once connected, the householder can open the door or gate by pressing a prescribed key on their phone.
Various finishes are available. Modular panels on apartment blocks may have over 20 call buttons, each programmed to a different set of numbers.
A unique feature of GSM intercoms is using caller ID as an access code. Friends and family who know the intercom's SIM card number only have to dial it to open the gate. The line is dropped as soon as the intercom recognises the caller.
IP - Wireless video intercoms
IP intercoms are video systems using digital video, with the ability to display on a fixed house monitor or a smartphone. Smartphones at home will connect by wifi to the house network. When you are out, the smartphone connects to the world network using your internet data,facility.
A smartphone needs to have the relevant app installed to accept calls. There is no call charges except the roaming data use. The householder can open the door or gate by pressing a button on the app. Various finishes are available.
