Cisco Prisma II, Installation Manual

Page: 178 / 184

Glossary
152 78-4025693-01 Rev D
ONT
optical network termination. Optical network elements that terminate a network signal; also
interchangeably referred to as an optical network unit (ONU).
P
PID
packet identifier or program identifier.
PLL
phase lock loop. An electronic servo system controlling an oscillator to maintain a constant
phase angle relative to a reference signal.
PON
passive optical network. A system that brings optical fiber cabling and signals all or most of
the way to the end user. Depending on where the PON terminates, the system can be
described as fiber-to-the-curb (FTTC), fiber-to-the-building (FTTB), fiber-to-the-premises
(FTTP), or fiber-to-the-home (FTTH).
Q
QAM
quadrature amplitude modulation. An amplitude and phase modulation technique for
representing digital information and transmitting that data with minimal bandwidth. Both
phase and amplitude of carrier waves are altered to represent the binary code. By
manipulating two factors, more discrete digital states are possible and therefore larger binary
schemes can be represented.
R
RF
radio frequency. The frequency in the portion of the electromagnetic spectrum that is above
the audio frequencies and below the infrared frequencies, used in radio transmission systems.
RMA
return material authorization. A form used to return products.
RT
remote terminal. Remote equipment of a supervisory system.
RX
receive or receiver.
S
SA
spectrum analyzer.