PCS and Cellular System
System pager, PCS phone, and mobile radio communications using multiple technologies. However, everything is divided into several geographical era of small areas, or cells, the area is generally from one to several square miles. Each cell has a low-power transmitter or radio antenna to broadcast a call from one cell to the other. Computers and other communications processors coordinate and megendalikan transmission to and from mobile users, as they move from the area to other areas.
Mobile phone system, have long used analog communications technology beroperasipada frequency 800 to 900 MHz. The new cellular systems use digital technology, which provides security and greater capacity, and ancillary services such as voice mail, paging, messaging, and caller ID. This capability is also available on the phone system PCS (personal communication service). PCS operates at a frequency of 1900 MHz using digital technology related to digital cellular. However, the PCS telephone system costs much less to run and use, rather than cellular systems and require less power consumption.
Cabling in an office or building for an advanced local area network often a difficult and costly task. The buildings are older, often do not have the channel for coaxial cable, double or extra cables and lines in the newer building, may not have enough space to put additional cable. Repair wiring errors and damage is often difficult and expensive, the same as with the relocation of the workplace LAN, and other components. One solution to this is an issue with installing Wireless LAN, using one of several wireless technologies. For example, high-frequency radio technology similar to digital cellular and a low frequency radio technology called Spread Spectrum (Spectrum spead).
The use of Wireless LANs grows rapidly with the implementation of the new high-speed technologies. For example, a wireless radio wave technology open standard, called IEEE.802.11b, or more popularly didesebut, WiFi (Wireless Fidelity). WiFi is much faster (11 MBps) and cheaper than a standard ethernet cable-based LAN technologies. Developing IEEE.802.11.g (54 MBps), and the longer the higher speed.
Wireless Access to the internet, intranet and extranet grow along with the increasing number of Web-based information tools. Smart Telephone, Pager, PDA, and other communications equipment, an advanced client has a very thin (very thin Client) in a wireless network. Agreement on standarprotokol wireless applications (Wireless Application Personal, WAP), which encourages the development of many wireless services and Web applications. The telecommunications industry continues elaborated third generation wireless technologies (3G) which aims to improve wireless transmission speeds to enable multimedia applications and video on mobile devices.