Руководство По Установке для Cisco Model GS7000 4-Port Node 1 GHz with 42 54 Split
Glossary
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4037424 Rev A
N
Nm
Newton meter. A measure of torque defined by the application of one Newton of force on a
lever at a point on the lever that is one meter from the pivot point. (1 Nm = 0.737561 ft-lb)
lever at a point on the lever that is one meter from the pivot point. (1 Nm = 0.737561 ft-lb)
O
OIB
optical interface board.
P
PCB
printed circuit board.
PROM
programmable read-only memory. A memory chip on which data can be written only once.
Once data has been written onto a PROM, it cannot be written to again.
Once data has been written onto a PROM, it cannot be written to again.
PWB
printed wiring board.
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.
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.
QPSK
quadrature phase-shift keying. A phase modulation technique for representing digital
information. QPSK produces four discrete states, each state representing two bits of
information.
information. QPSK produces four discrete states, each state representing two bits of
information.
R
RCM
reverse configuration module.
RCVR
receiver.
reverse path
Signal flow direction toward the headend.