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telecom

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  • #62348 Reply
    Ram
    Guest

    Whats the need of uplink and downlink
    frequency?

    #62349 Reply
    varun sharma
    Guest

    Hi RAM,
    Frequency is required to Trasnmit and receive signal over the channel.Channels having some frequencies.
    uplink and downlink freqencies always different to avoid interference.
    In CDMA band( 824-849MHZ : UL
    869-894Mhz: DL)

    for GSM 900: 890-915 MHZ: UL
    935-960Mhz: DL
    are using.

    There are two technique:
    FDD : Frequency division duplexing
    TDD: Time division duplexing

    In FDD different frequencies for uplink and downlink

    In TDD same frequency but this is time shared.

    #62350 Reply
    Ram
    Guest

    Hai varun
    Thanks for ur information.

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