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Glossary-4
IPPV
Impulse Pay-Per-view. An ordering mechanism in which subscribers place orders directly into
set-tops by remote control. Events are authorized immediately for viewing.
MAC address
Media Access Control address. A proprietary address used for upstream/downstream
communications. This is the lower sub-layer of the Data Link layer in the OSI model and is
used to describe the mechanisms used to arbitrate access to a shared medium.
MPEG-2 (MPEG-II)
An international standard (ISO/IEC 13818) for delivering compressed digital video. MPEG-2
broadcast quality is 704x480 pixels at 30 frames per second (fps) in North America and 704x576
pixels at 25 fps in Europe. MPEG-2 is typically compressed at higher than 5 Mbs and intended
for higher quality broadcast uses.
OAM&P
A telephone industry acronym referring to operations, administration, maintenance, and
provisioning. The term refers to software required to generate the reports and commands
needed to control all network equipment. The OAM&P port is a network (Ethernet) port
through which a device communicates with the headend network. The OAM&P port is assigned
a hardware (MAC) address at the factory; this MAC address is used for communication with the
bootp server before the network (IP) address is assigned to the port.
Packet Identifier (PID)
A number assigned to MPEG transport packets to identify the information stream to which they
belong. The PID number is assigned in the packet header, and all packets from the same stream
have the same PID number. A 13 bit number included in MPEG-2 transport packet headers.
Quadrature Phase Shift Keying (QPSK)
A digital modulation method that combines two carriers that are 90 degrees out of phase (in
quadrature), resulting in four possible phase states.
Reed-Solomon encoder
A block-based encoding technique used for forward error correction.
User Datagram Protocol (UDP)
A transmission protocol that uses an IP address to identify the destination host and a port
number to identify the destination application.
OM 1000 Installation and Operation Manual
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