System description : Intercom system known as a stand-alone audio/video communications system which is generally mounted permanently in buildings. The traditional intercom system is connecting with one or few pairs (4-6 pairs) of PVC/Telephone cable. The latest generations are even compatible with computers and some models include TCP/IP which will connect to the same structured cabling system (local area network which known as LAN commonly).
System Operation flow :
1) Master Station or Guard Station – normally used by security guard or management office to initiate a call with any of the stations and make announcements over the whole system.
2) Sub-station – normally used by tenant or resident and only capable of initiating a call with the Master Station but not capable of initiating calls with any other stations (sometimes called slave units). The latest digital model had enable the feature of initiating calls with other slave stations.
3) Door Station – normally used by visitor and only capable of initiating a call to a Master Station. They are typically weather-proof.
System application location : terrace, semi-detached, bungalow unit, office, carpark, high-rise residential building, hotel, hospital, factory and etc.