Modulation : Embedding base
signals in high frequency carriers.
Multiplexing : Sending more
than one information signal on the same communication
medium.
Noise : Disturbance in a
communication system.
Photodetector : A device
that accepts light as input and produces electric current as output.
Repeater : A device used in
microwave radio communication which filters noise from
the incoming signal, amplifies and retransmits the signal
to the next station
at the same frequency.
Shielded Twisted Pair (STP) : Shielded pair of wires that are twisted.
Signal : A time varying electrical,
optical or electromagnetic quantity representing
information, speech, video, etc.
Transponder : A device
inside the satellite that receives uplink signals, filters out noise, amplifies
and retransmits at the downlink frequency.
Unipolar : Representation of
digital signals using voltages of the same polarity.
Unshielded Twisted Pair (UTP) : Unshielded pair of wires that are twisted.
Wavelength : The physical
distance occupied by one cycle of a signal wave while propagating
in free space.
Access links : Communication
links that connect the user to the nearest switch.
Asynchronous transfer mode : Mode of
information transfer in broadband ISDN.
Base station : A wireless
station covering a certain geographical area called
cell.
Broadband ISDN : An ISDN
designed for very high-speed applications.
Cell : In the context of
mobile communication, a cell denotes a small geographical area. In the context
of broadband ISDN, cell is a small digital packet that carries information.
Cell switching : A switching
technique in which information is cast in the form of small cells and
transported over broadband ISDN networks.
Cellular communication : A
wireless communication technique in which a large geographical
region is divided into a number of cells that are networked.
Channel : An information
pipe with some specified characteristics like bandwidth, capacity, level of
attenuation and noise immunity.
Circuit : A two-way link
comprising two channels, one in each direction.
Circuit switching : A
switching technique in which a dedicated path is established between end points
for the entire duration of information transfer.
Common Channel Signalling:
Signalling done using a separate channel that is common to many information
channels.
Datagram : An independent
packet containing complete address information.
Digit processing :
Processing of a telephone number at the telephone exchange.
End systems : Equipments at
the subscriber premises that connect to a telecommunication network.
Fully connected network : A
network in which all communicating entities are directly connected with each
other.
Packet switching : A
switching technique in which large size data is broken as packets and
transferred across networks.
Permanent virtual circuit : A virtual
circuit assigned on a long-term basis.
Public switched network : A switched
network open to public.
Reassembling : The process
of assembling packets or cells to reconstruct the original message at the
destination.
Resequencing : The process
of arranging the packets in proper order when they arrive out of sequence at
the destination.
Signalling : Indicative or
control signals exchanged between a subscriber and a switching node or between
two switching nodes.
Space division switching : A
technique in which a dedicated physical path is established inside a switch.
Subscriber : A user
connected to a telecommunication network.
Switch : A device that
establishes and releases connections between subscribers.
Switched network : A network
in which users are connected to a switching system.
Time division switching: A
technique in which a shared common resource is used for transferring
information from an inlet to an outlet in a switch.
Transmission links :
Communication links that interconnect switching systems.
Virtual circuit : A fixed
route for information transfer.
Address resolution :
Conversion of one address to another like IP address to machine
address and vice versa.
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