...4 defines a low power, low data rate, RF networking technology that is being widely used for Wireless Sensor and Control Networks worldwide. IEEE 802.15.4c is a Physical Layer amendment supporting operation in unlicensed sub 1 GHz frequencies...
http://standards.ieee.org/announcements/new802.15.4c.html
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...6Mbit/s, enabling the connection of remote company networks, video monitoring applications or remote access to control networks. The units also feature a serial interface to connect legacy RS-232 devices. The mobile LAN router features...
http://www.electronicstalk.com/news/fij/fij102.html