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Connecting sensors and actuators by wireless links is the next step in field-bus technology. The problems that need to be solved and some proposals in the industrial domain are presented. It appears that there is no straightforward solution to the problem. Possible wireless LAN solutions are described and checked for suitability. Wireless transmissions come in two flavors, radio and light based systems. They both exhibit characteristics that make them very different from cable based transmission. One of the first ideas when going to wireless is just to substitute the cable transceiver by a wireless, radio or light, transceiver. Except in special cases, this cannot be done so easily as explained. There exist a number of proposals to interconnect field devices without wires: OLCHFA (Open Low-Cost Time-Critical Wireless Field-bus Architecture), LON (EIA-709.1), R-Field-bus, integration of wireless nodes to a FIP field-bus. In the office environment, a number of proposals to interconnect computers together or with peripherals are available: IEEE 802.11, Bluetooth, DECT (Digital Enhanced Cordless Telephone) and IrDA AIr (Advanced Infrared).