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Term
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Description
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L2CAP (Bluetooth)
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Logical Link Control and Adaptation Protocol. The L2CAP is
the layer that is responsible for managing the virtual connections
between Bluetooth devices and the first level of Asynchronous
ConnectionLess (ACL) data flow. Logical Link Control creates
and manages a virtual connection for each I/O task the host
gives it. This allows Bluetooth to support multiple concurrent
I/O transactions such as an Internet connection and file transfer
proceeding simultaneously.
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LAN
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Local area network. A network interconnecting devices in
the same office, floor, or building, or areas inside buildings
with areas just outside. A group of PCs and other devices
dispersed over a relatively limited area and connected by
a communications link that enables any device to interact
with any other device on the network.
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LAPD (Link Access Procedure for D channel)
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The data link layer protocol that was defined for communication
over the D channel. It is based on HDLC and defined in the
I.441/Q.921 specifications.
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LARQ
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Limited automatic repeat request
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Laser Printer
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A type of printer that utilizes a laser beam to produce an
image on a drum. The light of the laser alters the electrical
charge on the drum wherever it hits. The drum is then rolled
through a reservoir of toner, which is picked up by the charged
portions of the drum. Finally, the toner is transferred to
the paper through a combination of heat and pressure. This
is also the way copy machines work.
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Latch
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A basic logic function that stores the input value of a signal.
Unlike a flip flop, the output directly reflects the input
value when enabled.
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Latency
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In general, the period of time that one component in a system
is spinning its wheels waiting for another component. Latency,
therefore, is wasted time. For example, in accessing data
on a disk, latency is defined as the time it takes to position
the proper sector under the read/write head. In networking,
the amount of time it takes a packet to travel from source
to destination. Together, latency and bandwidth define the
speed and capacity of a network.
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LAV (HAVi)
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LAV is an acronym for Legacy AV devices.
LAV devices are existing devices that were designed prior
to the development of HAVi and therefore are not 'HAVi aware'.
Typical examples are current DV camcorders.
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LCD
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Acronym for Liquid Crystal Display. A low power display,
such as a watch or calculator.
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LCD Printer
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Similar to a laser printer. Instead of using a laser to create
an image on the drum, however, it shines a light through a
liquid crystal panel. Individual pixels in the panel either
let the light pass or block the light, thereby creating a
dot image on the drum.
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Leased Line
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Any circuit or combination of circuits designated to be
at the exclusive disposal of a given subscriber. Synonym:
Private line; Full Period Line.
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LEC
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Local Exchange Carrier - also commonly known as your local
phone company. The supplier of phone and communications within
a specific city or geographic region.
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LED Printer
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An electrophotographic printer that uses a matrix of LEDs
as its light source. The LED mechanism is much simpler than
its laser printer counterpart. A stationary array of LEDs
is used instead of numerous moving parts, and the LEDs are
selectively beamed onto the drum.
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Link
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Covers framing, synchronization, error control, and flow
control.
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Link Manager (Bluetooth)
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The link manager layer in Bluetooth is the module that physically
creates (connects), configures (QoS agreement, security provisions,
etc.), and terminates all device to device links.
In ACL data flow the link manager also transfers data from
the L2CAP to the baseband and back. On the way down it passes
the data to the baseband with the appropriate control information
for the target link (i.e. target device ID, encryption parameters,
etc.) and on the way up it associates the incoming data to
the source link for the L2CAP.
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Liquid Audio
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Based in Redwood City, Liquid Audio is the pioneer and current
market leader in downloadable media commerce technology on
the Internet The company derives its revenue from the delivery
of software products including authoring tools, and servers
for media commerce; as well as media commerce services. While
the Liquid Audio media architecture can support multiple audio
coding standards, the default codec is based on AAC and includes
copy protection features.
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LLC
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Logical Link Control (LLC. IEEE-defined sub layer of the
OSI link layer that handles error control, flow control, and
framing. The most prevalent LLC protocol is IEEE 802.2, which
includes both connectionless and connection-oriented variants.
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LMDS
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Cellular cable.
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LNB
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Low Noise Block Converter. Usually mounted at the focal point
of the dish and used to amplify and convert satellite signals
into frequencies sent to the receiver.
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Local bus
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Usually refers to a system bus directly connected to the
microprocessor on a system board. It also refers to system
board buses located closer to the microprocessor than are
ordinary expansion buses (that is, with less buffering), which
are therefore capable of greater throughput.
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Logic Cell
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Metric used to compare various FPGA device densities.
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LogicCORE
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Xilinx created logic functions. Can be accessed with CORE
Generator.
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Loop
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Twisted-pair copper telephone line.
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Lossless compression
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A compression technique that preserves all the original information
in an image or other data structures.
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Lossy compression
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A compression technique that improves data reduction by discarding
unnecessary image information.
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Low-Pass Filter
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A filter that passes low frequency signals.
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LUT
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Acronym for Look-Up Table. A LUT can implement any logic
function of its inputs.
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LVCMOS
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Acronym for Low Voltage CMOS. Common I/O standard for chip
to chip interfaces.
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LVTTL
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Acronym for Low Voltage TTL. Common I/O standard for chip
to chip interfaces.
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