The physical layer includes all hardware components and the wireless connections. This includes the high speed radios, orderwire packet radios, ATM switch, antennas, and additional processor for configuration and setup. This layer provides a raw pipe for the data link layer described in the next section. Directional beams from a single antenna are used to obtain spatial reuse and Time Division Multiple Access (TDMA) is used to provide access to multiple RNs within a beam. The physical layer details can be found in . The NCP sets up the physical layer wireless connections.