Constellation® January 2006
Glossary-4
MHSB. Monitored Hot StandBy.
MIB. Management Information Base.
MTBF. Mean Time Between Failures.
MTBO. Mean Time Between Outages.
MTR. Mean Time to Restore the circuit after failure.
MTTR. Mean Time To Repair.
MUX. MUltipleXer.
N
NMS.
Network Management System.
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.
NRZ. NonReturn to Zero (coding).
NTIA. National Telecommunications and Information Administration
(U.S.A.)
P
PA. Power Amplifier.
PBX. Private Branch Exchange.
PCB. Printed Circuit Board.
PCM. Pulse Code Modulation.
Q
QAM.
Quadrature Amplitude Modulation. Quadrature modulation in which
two carriers are amplitude-modulated.
R
RF.
Radio Frequency.
RFI. Radio Frequency Interference.
RIP. Routing for Internet Protocol.
RMS. Root Mean Square.
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