Wireless Ethernet 802.11 uses either direct-sequence spread spectrum, frequency-hopping spread spectrum, or infrared light in the physical layer. It uses direct sequence spread spectrum to spread signals over a broad frequency band for high bandwidth applications, while frequency hopping spreads signals across 79 channels from 2.402 to 2.480 GHz using 78 hopping sequences. The data link layer uses the same 802.2 logical link control and 48-bit MAC addressing as other 802 LANs, but the MAC layer is similar yet different to Ethernet with CSMA/CA instead of CSMA/CD and optional RTS/CTS to address hidden nodes.