ADMS 2511 Study Guide - Final Guide: Teijin, Trade Secret, Retail

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Document Summary

E-mail handhelds help to keep in touch with clients and the office: cell phone use radio wave to provide two-way communication. The cell phone communicates with radio antennas (towers) placed within adjacent geographic areas call cells. Cellular technology, nowadays provides high transmission speeds and richer features (sms, 3g, video, First generation (1g) analog signals and low bandwidth. Second generation (2g) digital signals for voice communication. 2. 5 g digital signals for voice communication. Third generation (3g) digital signals for voice communication. Kbps (in car), 384 kbps (walking), and 2 mbps (fixed): personal digital assistants (pdas) are small, handheld computers that can transmit digital communications. Microwave towers usually cannot be spaced more than 30 miles apart (earth surface"s not flat) and affected by bad weather such as heavy rain or snowstorms. Low-earth-orbit (leo) are 400 to 700 miles above the surface and move much quicker so they require many to have adequate coverage; use for telephone.