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Comtech EF Data QAM256 User Manual

Page 86

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QAM256 Digital Video Modulator and Upconverter

Glossary

TM077 – Rev. 4.0

G-5

Q

QAM

Quadrature Amplitude Modulation

QPSK

Quadrature Phase Shift Keying

R

RAM

Random Access Memory

RF Radio

Frequency

ROM

Read Only Memory

rms

Root Mean Square

RU

Rack Unit. 1 RU = 1.75”/4.45 cm

Rx Receive

(Receiver)

RxD Receive

Data

R-S

Reed-Solomon Coding. Reed-Solomon codes are block-based error correcting
codes with a wide range of applications in digital communications and storage.

S

SCC

Satellite Control Channel. A Radyne satellite format.

SEQ Sequential

SYNC Synchronize

T

TBD

To Be Designed or To Be Determined

TM Technical

Manual

TPC

Turbo Product Codes

TRE Trellis

TT Terminal

Timing

Tx Transmit

(Transmitter)

TxD Transmit

Data

U

UART

Universal Asynchronous Receiver/Transmitter

UUT

Unit Under Test

V

V Volts

VAC

Volts, Alternating Current

VCO

Voltage Controlled Oscillator

VDC

Volts, Direct Current

VIT Viterbi

Decoding