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C-D
CIF
Common Intermediate Format. CIF is a video image format using 352
horizontal pixels and 288 vertical lines. The format is adopted in multimedia
communication standards.
CIRCUIT SWITCHED SERVICE
This is a data transfer communication service which (as in the case of standard
telephone service) applies circuitswitching for each call to establish a circuit
with the other party and then disconnect that circuit upon call completion.
However, circuit-switched services are losing their relevance with the
development of packet-switching as typified by communication over the
Internet.
CODEC
CODEC is an amalgam of the terms "Coder" and "Decoder" It generally
signifies the encoding device/module which carries out highly efficient
conversion processing from the basic digital signal to a compressed signal
during digitalisation of voice and picture signals. Encoding specifications for
the voice CODEC and image CODEC are stipulated by the G-series and H-
series IJU-T recommendations, respectively. In the case of mobile
communication, encoding specifications are established by the concerned
standardising bodies.
CUTTING EDGE
Enhanced Data Rates for GMS Evolution, also referred to as GSM384 or UWC-
136. EDGE is an evolution of GSM and US-TDMA systems. It provides data
rates up to 384 kbit/s.
DIGITAL SIGNATURE
An electronic signature. A technology used to guarantee the reliability of
information during electronic transactions. Digital signaturing is enabled
through the application of open key encryption technology, and comprises
electronic data verifying the identity of the user. A digital signature is created
by coding data using an encryption key. Since only the user him/herself is in
possession of the corresponding encryption key, the digital signature is
essentially unforgettable. The digital signature is subsequently attached to
data transmitted to another party to guarantee that the individual sending the
message really is who he or she claims to be.
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