ZWave

ZWave supports the transmission of three frame types on a network—unicast, multicast, and broadcast. Unicast communications (that is, direct) are acknowledged by the receiver; however, neither multicast nor broadcast transmissions are acknowledged. ZWave networks consist of controllers and slaves. There are variants of each of these, of course. For example, there can be both primary and secondary controllers. Primary controllers are allowed to add and remove nodes form the network. ZWave operates at a frequency of 908.42 MHz (North America) and 868.42 MHz (Europe) with data rates of 100 kb/s over a range of about 30 meters.