HE4000 Encoding System
Glossary
CLK
Clock
cm
Centimeter
COM
Common
CPS
Cells per second
CPU
Central Processing Unit
CRC
Cyclic Redundancy Check. A system of error checking performed at the
transmitting and receiving stations.
CSA
Canadian Standards Association — The Canadian counterpart of the U.S.
Underwriters Laboratories.
CW
Continuous Wave
C/N
Carrier to Noise Ratio
D
DAC
Digital to Analog Converter
Data
Typically refers to the information content of a signal including video, audio,
graphic, or character-based information.
Data Bits
Within a data packet, the bits which represent the information content of a
packet. See also Data.
dB
Decibel. A unit of measure of signal strength, usually the relation between a
transmitted signal and a standard signal source. An increase of 3 dB results in
a doubling of the signal strength. An increase of 6 dB results in a quadrupling
of the signal strength. Conversely, a decrease of 3 dB and 6 dB results in a
reduction in signal strength by one half and three quarters, respectively.
dBc
Decibels Referred to Carrier
dBm
Decibels Referred to 1.0 milliwatt
DC
Direct Current
Decode
To convert a coded signal into its original form.
Demod
Demodulation. See Demodulate.
Demodulate
To retrieve an electrical signal from a carrier signal or wave.
DPLL
Digital Phase Locked Loop
DS3
A commercial leased line format that has the capacity to handle up to 44.763
Mbps of digital information; North American standard digital interface.
dsec
Deci-seconds. A measurement of time that is equal to 0.1 seconds. For
example, 15 dsec is equal to 1.5 seconds.
DTE
Data Termination Equipment. A generic name for any device that generates
information to be transmitted to another device or over a transmission system.
For example, visual display units, computers, and office workstations.
DVB
Digital Video Broadcast. A set of standards providing the specifications for
transmission and reception of digitally processed broadcasting signals.
D&I
Drop and Insert
01-0951-404 Rev B
GL-3
