Glossary
GL-5
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
OL-17309-02
NTSC National Television System Committee.
NVRAM Nonvolatile random-access memory.
O
OIR Online insertion and removal.
P
PAL Phase alternating line.
PCI Protocol control information.
Q
QAM Quadrature amplitude modulation. A modulation technique using variations in simple amplitude.
QPSK Quaternary phase shift keying. A compression technique used in modems and wireless networks.
R
RTS Request to send.
S
SDH Synchronous Digital Hierarchy.
SDRAM Synchronous dynamic random-access memory.
SECAM SEquential Couleur Avec Memoire.
SGCP Simple Gateway Control Protocol.
SONET Synchronous Optical Network. High-speed synchronous network specification developed by Bellcore
and designed to run on optical fiber. STS-1 is the basic building block of SONET. It was approved as
an international standard in 1988.
SRAM Static random-access memory.
STB Set-top box.