Microwave Radio Communications SCM4000, Техническое справочное руководство

Страница: 248 / 274

Glossary A-6 SCM4000 Operator’s Guide/Tech Ref Manual
PAL-N Phase Alteration Line
Color television standard used in many European
countries. Provides 525 horizontal lines of resolution
with 60 lines per field. Not compatible with NTSC or
SECAM.
PC Personal Computer
PCR Program Clock Reference
PER Parity Error Rate
ØLK Phase Lock
PID Program Identification
PLL Phase Lock Loop
PRBS Pseudo Random Bit Sequence
QAM Quadrature Amplitude Modulation
QPSK Quadrature Phase Shift Keying
The signal (video+audio) is imposed onto the 70 MHz
carrier by varying the phase of the signal while
keeping the amplitude and frequency constant. There
are 4 possible values of phase that can be used to
carry information.
RCL Received Carrier Level
The strength of a received RF signal, in dBm.
RCU Receiver Control Unit
RCL Received Carrier Level
Rcvr Receiver
RD Receive Data
RDS Radio Data System
Table A-1: Useful Terms (Continued)
RF Radio Frequency
RF Level RF Power from the transmitter.
RFU Radio Frequency Unit
RMA Return Material Authorization
R-S Reed-Solomon
RSSI Receiver Signal Strength Indicator
RX Receiver
RXU Receiver Unit
RZ Return to Zero
SC Service Channel
SC Single Carrier
SCM Single Carrier Modem
SD EMB Synchronous Digital Interface Embedded
SDI Synchronous Digital Interface
A serial communications interface operating at
270 Mbit/sec. Generally used for in-studio news
operations.
SECAM Sequence de Couleur Avec Memoire
Color television standard used in France, Russia,
and other countries. Provides 625 horizontal lines of
resolution. Not compatible with NTSC or PAL. Not
supported by this product.
SER Symbol Error Rate
Setpt Set point
SFN Single-Frequency Network
SG Signal Ground
Table A-1: Useful Terms (Continued)