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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.

300 ITU‐T's Technical Reports and Specifications