Cisco Cisco Prisma II EDR Receiver Installation Guide
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Glossary-4
Glossary
78-748704-01 Rev C
Glossary
, Continued
Distribution System
Part of a cable system consisting of trunk and feeder cables
used to carry signals from headend to subscriber terminals.
Downconverter
A device that converts an input signal to a lower frequency
output signal.
Down link
A transmission path carrying information from a satellite
or spacecraft to earth.
DP
Data processing
DPU
Digital processing unit
DSP
Digital signal processor
DSR
Digital Storage and Retrieval System
D to U
Desired to undesired signal ratio
DTMF
Dual Tone Multiple Frequency
Duplexer
A device that permits the connection of both a receiver and
a transmitter to a common antenna.
DVM
Digital voltmeter
DWDM
Dense Wave Division Multiplexing
ECL
Emitter coupled logic
ECM
Entitlement Control Message
EDFA
Erbium Doped Fiber Amplifier
EEPROM
Electrically Erasable Programmable Read-Only Memory
EIA
Electronics Industry Association
EMI
Electromagnetic interference
Emission designer
An FCC or CCIR code that defines the format of radiation
from a transmitter.
EPROM
Erasable Programmable Read-Only Memory
EQ
Equalizer