Constellation™ November 2003
Glossary-4
NEC National Electric Code (registered trademark of the National Fire
Protection Association).
Noise Figure The ratio of the output noise power to the portion of the
output noise power stemming from thermal noise at the input at standard noise
temperature.
NP NonProtected.
O
OCXO Ovenized (proportional Control) Crystal Oscillator.
OEM Original Equipment Manufacturer.
P
PDU Protocol Data Unit.
PLL Phase-Locked Loop.
Q
QUICC QUad Integrated Communications Controller.
R
RCS Reverse Channel Switch.
RF Radio Frequency.
RIP Routing for Internet Protocol.
RMA Return Material Authorization.
RMS Rack-Mounting Space.
RSL Received Signal Level.
RX Receiver.
S
SCAN
System Control And Alarm Network. Harris’ proprietary standard for
sending alarm/status/control messages over a serial port.
SD Space Diversity. Pertaining to signal transmission and reception in which
two or more separate and independent propagation media or paths are used for
transmitting the same information.
SES Severely Errored-Seconds.
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