Here are relevant links in relation to the field of Access Control and similar topics.
Centra Security (UK) - Centra are an Electronic Security & FIA Fire Alarm Trained Systems Installers founded in 1990. We are experienced in the planning, installation and maintenance of Access Control, CCTV and all types of intrusion detection sensors and devices.
Automated Buildings (USA) - Online magazine and web resource providing news and connections to the building automation industry.
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Access Control Systems using Power over Ethernet (PoE) Technology from Borer