Wireless local loop

From Free net encyclopedia

Wireless local loop (WLL), also called radio in the loop (RITL) or fixed-radio access (FRA) or fixed-wireless access (FWA), is the use of a wireless communications link as the "last mile" connection for delivering plain old telephone service (POTS) and broadband Internet to telecommunications customers.

Nowdays there are various types of WLL systems.

Contents 1 Originally Mobile 2 Fixed 3 WLL Standards 4 See also

Originally Mobile

These are available in Code Division Multiple Access (CDMA), Global System for Mobile Communications (GSM), IS136 Time Division Multiple Access (TDMA) as well as analog access technologies such as Advanced Mobile Phone System (AMPS), for which there will be independent standards defining every aspect of modulation, protocols, etc.

Fixed

Fixed Wireless Terminals or FWT units differ from conventional mobile terminal units operating within cellular networks -such as GSM- in that a fixed wireless terminal or deskphone will be limited to an almost permanent location with almost no roaming or find-me anywhere facilities.

WLL and FWTs are generic terms for a radio based telecommunications technologies and the respective devices which can be implemented using a number of different cellular systems technologies.

Indeed, confusingly, some WLL providers do so use fixed GSM equipment as well as there are others that employ any of the other wireless access methods mentioned above.

WLL Standards

• Mobile:
  • CDMA (USA).
  • TDMA (USA).
  • GSM (Europe).
  • UMTS 3th Generation (World).
  • Personal Handy-phone System (PHS in Japan, PAS/Xiaolingtong in China)
• Fixed or local area network:
  • DECT, for local loop (Europe)
  • corDECT (India)
  • LMDS

See also

• WiMAX
• Antenna
• IDU
• cable
• RJ-45
• RFde:Wireless Local Loop

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