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    Logical Link Control (LLC).  The Logical Link Control (LLC) is a sub-layer of the data link layer of the OSI reference model, which forms the interface between the network layer and the media access control protocols.

    Low earth orbit (LEO).  A low earth orbit is a satellite that at operates at heights of between 500 and 2,000 km above the earth’s surface.

    Low frequency (LF).  The low-frequency (LF) band is the radio-frequency (RF) band in the range 30-300 kHz. LF suffers from the same difficulties associated with ELF: small bandwidths are available; and antennas are large and inefficient, leading to low radiated powers.

    Lower sideband (LSB).  When only one sideband is transmitted, the transmission is called single-sideband suppressed carrier (SSBSC) or more commonly SSB. When the upper sideband is transmitted the transmission is called upper side band (USB) and when the lower sideband is transmitted it is called LSB.

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    Latency.  Latency means delay, normally in propagation time across a network.

    Layer.  Protocols are normally structured using layers to reduce complexity. Dividing communication software into multiple protocol layers also increases flexibility because it allows subsets of protocols to be used as needed.

    Line Coding.  Topics in the Communications Systems Glossary related to Line Coding are: Pulse code modulation, Alternate mark inversion, Pulse duration modulation, Pulse amplitude modulation, Pulse length modulation, Delta modulation, Pulse position modulation, Pulse width modulation.

    Link.  A link is the circuit established directly between two nodes.

    Local area network (LAN).  A local area network is a communication network that interconnects communicating devices within a small area.

    Local loop.  The local loop is a transmission path (generally twisted pair cable) between an individual subscriber (normally a domestic subscriber) and the nearest switching centre of a public telecommunications network.

     

    Please contact Argos Press if you wish to suggest new words or phrases to extend our glossaries. Please contact Argos Press to request permission to reproduce, broadcast, adapt and communicate content from this web site (such as this entry on Communications Systems). © Argos Press Pty Ltd, Canberra, 2003-2004. All rights reserved.

    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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