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    Cellular Telephone Generations

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    تاريخ التسجيل : 12/05/2010

    Cellular Telephone Generations

    مُساهمة من طرف Admin في الإثنين نوفمبر 08, 2010 8:13 am


    Cellular Telephone – 1st Generation
    AMPS – Advanced Mobile Phone Service –
    first popular cell phone service; used
    analog signals and dynamically assigned channels
    D-AMPS – Digital AMPS – applied digital
    multiplexing techniques on top of AMPS analog channels
    PCS – Personal Communication Systems –
    essentially all-digital cell phone service
    PCS phones came in three technologies:
    TDMA – time division multiple access
    CDMA – code division multiple access
    ( the most is used in the America the more than from GSM.
    GSM – global system for mobile communications

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    Cellular Telephone – 2.5
    Generation
    AT&T Wireless, Cingular Wireless, and T-Mobile now using GPRS
    (General Packet Radio Service) in their GSM networks
    (can transmit data at 30 kbps to 40 kbps)
    Verizon Wireless, Alltel, U.S.Cellular,
    and Sprint PCS are using CDMA2000 1xRTT
    (one carrier radio- transmission technology) (50 kbps to 75 kbps)

    Cellular Telephone – 2.5 Generation

    Nextel used IDEN technology
    EDGE (Enhanced Data
    Rates for Global Evolution) replaces GSM and
    can transfer data at rates of 70 kbps to 135 kbps
    Cellular Telephone – 3rd Generation
    UMTS (Universal Mobile Telecommunications System) –
    also called Wideband CDMA; the 3G version of
    GPRS; UMTS not backward compatible
    with GSM (thus requires phones with multiple decoders)
    (200 kbps to 300 kbps)




    1XEV (1 x Enhanced Version) – The 3G replacement for 1xRTT; will come in two forms:


    1xEV-DO for data only (400 kbps to 700 kbps)


    1xEV-DV for data and voice

    Cellular Telephone – 3rd Generation

    HSDPA (High Speed Downlink Packet Access) is an
    extension of the GSM/EDGE technology. Data rates 400 kbps to 700 kbps.
    EV-DO Rev.A – speeds up to 3.1 Mbps ? Due out in 2007-2008??
    /*
    /*Thise the information from DATA Communication
    And Computer Network
    Curt M.white
    Depaul University/*

    With Getting Abdullah Mohammad Al-iarri/*/*

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      الوقت/التاريخ الآن هو الخميس نوفمبر 22, 2018 3:34 am