484 ITU‐T's Technical Reports and Specifications 7.2.1 Overview One of the key aspects of an intelligent building is the ability it has for the different sub‐systems to communicate with one another. This communication will occur over the ICT infrastructure. The ICT infrastructure is the transport medium (wired and wireless) that carries all the data: voice, video (multimedia), security, VoIP (voice over IP), PoE (Power over Ethernet) throughout the building or campus. It forms the backbone why which data travels from one location in the building to another, how the different sensors and actuators communicate as well as how different systems (HVAC and Lighting for example) communicate with one another. It can include everything from the data‐center to the desktop, wired jacks at the wallplate, wireless access points, structured cabling and associated equipment. Hence, many intelligent buildings try to optimize the use of ICT infrastructure across the different systems in a building for example access control, video surveillance, building automation and other functions in the building. Such an ICT infrastructure balances the wired infrastructure with the use of wireless systems such as Wi‐Fi and other wireless technologies throughout a building. As ICT continues to converge with traditional building control systems this infrastructure becomes increasing a critical and key attribute of an intelligent building. It is important that an intelligent building not only have a secure, converged data network but also the following attributes: Integrated Voice, Video and Data; Data Security Measures – including encryption, admission and intrusion detection; Data Quality of Service (QoS); Bandwidth Management; Redundancy (to account for failure) including Uninterrupted Power Supply; ICT device management. Typical technologies that are part of a Data / ICT infrastructure include: Networking LAN infrastructure; Core Routing Switching; Access Switching; Wireless Networking; Firewalls and Network Routers. In addition to the above technologies, the same infrastructure will have the capability to provide support and connectivity to other building related technologies and services like: Building Automation & HVAC Control / Energy Management Systems; Lighting Control Systems; Building Security and Access Control; Video Surveillance Systems; Fire and Safety Systems; Car Parking Systems.