Communications Systems Glossary

 

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    Fade.  A fade is a slow change in signal strength.

    Farad (F).  The Farad (F) is the SI unit of capacitance.

    Fibre-distributed data interface (FDDI).  Fibre-distributed data interface (FDDI) is an ANSI standard for fibre optic LANs employing token passing on a ring topology and providing speeds of 100 Mbps.

    Fibre optic cable.  A fibre optic cable is constructed by enclosing a thin glass fibre core in a glass cladding and surrounding the result in a protective jacket.

    Fixed-assigned multiple access (FAMA).  Fixed-assigned multiple access (FAMA) is one of the two main techniques for allocating channels to users.

    Fixed bit rate (FBR).  Fixed bit rate (FBR) is another term for constant bit rate (CBR) in asynchronous transfer mode (ATM).

    Flat Top Sampling.  In flat top sampling, the amplitude of the sampled pulse is held constant at the value of the amplitude of the analogue waveform at the time the sampling period began.

    Forward Error Correction (FEC).  Using forward error correction the receiver is able to correct errors itself without reference to the transmitter.

    Frame.  A frame is a formatted packet of data (bits), usually associated with the data-link layer.

    Frame check sequence (FCS).  The frame check sequence is the product of an error-detecting code, normally inserted as the final field in a block of transmitted data, that can be used upon reception of the data to detect errors.

    Frame Relay.  Frame relay is a form of packet switching based on the use of variable-length, data-link-layer frames.

    Frequency.  Frequency is the rate of signal variation (normally sinusoidal oscillation) in cycles per second.

    Frequency division duplex (FDD).  Frequency division duplex is a technique in which one frequency band is used to transmit and another used to receive.

    Frequency-division multiple access (FDMA).  Frequency-division multiple access divides a channel amongst users who are each given their portion of the available channel bandwidth for their permanent use.

    Frequency hopping (FH).  Using frequency hopping, data is transmitted at one frequency, the transmitter changes frequency and data is transmitted at the new frequency.

    Frequency modulation (FM).  Frequency modulation is a form of modulation in which the modulating signal is used to vary the frequency of a carrier wave. Frequency modulation is a form of angle modulation.

    Book Lists

    Frequency-division multiplexing (FDM).  Frequency-division multiplexing (FDM) is a technique that divides the available bandwidth of a channel into sub-channels, each of which is assigned to one device. Frequency-division multiplexing is directly applicable to analogue sources and essentially involves forming a composite signal by ‘stacking’ several information channels side-by-side in frequency. This composite frequency-multiplexed signal is then used to modulate a carrier in some conventional manner. Recovery of the individual messages after reception and initial demodulation is accomplished by bandpass filtering and frequency selection of the channels.

    Frequency-shift keying (FSK).  Frequency-shift keying is the simplest (binary) form of frequency modulation (FM), which is used for digital modulation in which the two binary values are represented by two different frequencies near the carrier frequency. Normally the carrier is shifted low for a 1 (called a mark in old telegraph terms) and high for a 0 (space).

    Full-duplex transmission.  See duplex transmission.

     

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    Our other resources include Antennas, Appliances, Broadband Internet, CDMA, Communications Systems, GSM, Modems, Project Management, Radar, Risk Management and Decision Making, Satellite Communications, SMS, Speakers, Systems Engineering, Team Building, Time Management, Transmitters and Receivers, and XML.
     
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