ITM 301 Lecture Notes - Network Layer, Fleet Management, Osi Protocols

• School: Ryerson University
• Department: Information Technology Management
• Course: ITM 301

Document Summary

Wireless networks (wlans: networks that transmit signals through the air via rf (radio frequency) waves. Wired and wireless networks share many similarities: use of the same layer 3 and higher protocols. The nature of the atmosphere makes wireless transmission different from wired transmission. The wireless/spectrum is the frequency range of electromagnetic waves used for data/voice communication: spans frequency ranges or bands between 9 khz and 300 ghz. Two antennas must be tuned to the same frequency to use the same channel. Propagation: the way in which a wave travels from one point to another. Los (line of sight: signal travels in straight line directly from transmitter to receiver. When obstacles are in a signal"s way, the signal may: pass through them, be absorbed into them, be subject to any of the following phenomena. Fading: as signals runs into obstacles, its energy will gradually fade, excessive fading can cause dropped connections or slow data transmission.