Page 186 - Electrical Engineering Dictionary

´
CSMA/CD CSMA with collision detec- Cuk converter named after its inventor,
´
tion. A modification of the CSMA protocol, Slobodan Cuk, this device can be viewed as a
where a user continues to monitor (sense) the boost converter followed by a buck converter
channel after it initiates its transmission to with topologic simplification. A capacitor is
determine if other terminals have also initi- used to transfer energy from the input to the
ated transmissions. The terminal aborts the output. The output voltage v o is related to
transmission if it detects a collision. This the input voltage v i by v o = v i d/(1−d) and
protocol is used in the local area network it can be controlled by varying the duty ratio
specified in the standard IEEE 802.3, which d. Note that the output voltage is opposite
defines a local area computer network com- polarity to the input.
monly referred to as the Ethernet. See also
carrier-sense multiple access.

CSO See composite second order.

CSR See control and status register.

CT See current transformer.
´ Cuk converter.
CT2 (cordlesstelephone, 2ndgeneration).
A digital cordless communication system de-
veloped in the United Kingdom, which oper- cumulative distribution function (CDF)
ates in the 864-868 MHz band and can pro- for a random variable x, the probability that x
vide both private and public cordless tele- is less than or equal to some value x, denoted
phony services. CT2-based public telephony F x (x). F x (−∞) is zero and increases mono-
services are often described as Telepoint ser- tonically to F x (+∞) = 1. For a continuous
vices(q.v.). CT2systemshave40radiochan- probability density function p(x), the CDF
nels, each 100 kHz wide. Each radio channel is
provides a duplex traffic channel using sim- Z x
F x (x) = p(t)dt.
ple “ping-pong” TDD. The carrier bit rate
−∞
is 72 Kb/s, and CT2 terminals have a peak
transmit power of 10 mW. The CDF is used in image processing to
carry out histogram equalization. See also
CTB See composite triple beat. histogram equalization, probability density
function.
CTE See coefficient of thermal expansion
mismatch. cumulatively compounded a compound-
wound DC machine in which the flux pro-
CU See coefficient of utilization. duced by the MMF of the shunt field wind-
ing and the flux produced by the MMF of the
cubic voxel See voxel. series field winding are in the same direction.

cubical quad antenna a parasitic array Curie temperature the temperature
antenna in which the elements are made of above which a material ceases to be mag-
square loops of wire with a perimeter of one netic; atthistemperatureaferromagneticma-
wavelength. These antennas are typically terial becomes paramagnetic.
used in the HF or VHF range and usually
have only two or three elements, resulting in current the flow of charge, measured in
a structure that fills a roughly cubical volume. amperes (1 ampere = 1 coulomb/s).

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