Cisco GS7000 Installation And Operation Manual page 64

Glossary
BW
bandwidth. A measure of the information-carrying capacity of a communications channel, for
example the range of usable frequencies that can be carried by a CATV system. The
bandwidth corresponds to the difference between the lowest and highest frequency that can
be carried by the channel.
C
C/N or CNR
carrier-to-noise ratio. The ratio, in decibels, of the carrier to that of the noise in a receiver's IF
bandwidth after specified band limiting and before any nonlinear process such as amplitude
limiting and detection takes place.
D
dB
decibel. One tenth of a bel, the number of decibels denoting the ratio of two amounts of
power being ten times the common logarithm of this ratio.
dc, DC
direct current. An electric current flowing in one direction only and substantially constant in
value.
distribution system
The part of a CATV system consisting of the transmission medium (coaxial cables, fiber optic
cables, etc.) used to carry signals from the headend system to subscriber terminals.
duplexer
A device which permits the connection of both a receiver and a transmitter to a common
antenna.
E
EMC
electromagnetic compatibility. A measure of equipment tolerance to external electromagnetic
fields.
EQ
equalizer.
equalization
The process of compensating for an undesired result. For example, equalizing tilt in a
distribution system.
ESD
electrostatic discharge. Discharge of stored static electricity that can damage electronic
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