300 ITU‐T's Technical Reports and Specifications Figure 57 – CALM architecture Source: ISO TC 204 –See: http://www.itu.int/dms_ pub/itu‐t/oth/06/05/T06050000130001PDFE.pdf CALM is intended to provide a standardized set of air interface protocols for ITS applications, using multiple network platforms. These include: 2G mobile systems, including GSM/GPRS, which are the most widely deployed mobile network worldwide; 3G (IMT‐2000) mobile systems, including W‐CDMA and CDMA 1x EVDO; Infrared; Wireless LAN systems, including the IEEE 802.11 series; Millimeter wave systems, including radar; DSRC, including national and regional implementations; Wireless MAN systems, including WiMAX; Broadcast signals, including GPS and Digital Audio Broadcasting (DAB); Personal Area Networks (PAN) including UWB and Bluetooth; Fixed‐line networks (for infrastructure to infrastructure communications), including Fiber and Ethernet. The next figures show some scenarios of application for vehicle safety and information.