Motorola APEX1000 Installation And Operation Manual page 334

Term
MAC address
MPEG-2 (MPEG-II)
OAM&P
Packet Identifier
(PID)
PSI (Program
Specific
Information)
Quadrature
Amplitude
Modulation (QAM)
Transmission
Control
Protocol/Internet
Protocol (TCP/IP)
User Datagram
Protocol (UDP)
Glossary • Abbreviations and Acronyms
APEX1000 All-Purpose Edge QAM Software Version 2.4.x • Installation and Operation Manual
573408-001-a
Definition
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.
An international standard (ISO/IEC 13818) for delivering compressed digital video.
MPEG-2 is broadcast quality at 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 5Mbs and intended for higher quality broadcast uses.
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.
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.
PSI information is required by the Host to determine the services contained
within each transport stream, and the component PID streams making up each
service to be encrypted. Knowledge of the component PID values is also required
to perform PID re-mapping. The APEX1000 must also detect version number
changes within these messages in order to respond to changes.
A data modulation technique used to convert digital program information for
delivery in cable TV systems over in-band frequencies (a form of double sideband
modulation).
The data stream is split into two half-rate streams. One of the data streams
modulates a sine wave carrier, the other a cosine carrier at the same frequency.
The resultant signal resembles a vestigial sideband signal with no pilot carrier
present.
The basic communication protocol of the Internet. TCP/IP is a two-layered
protocol:
•
The TCP layer breaks a data packet into smaller packets that are transmitted
over the Internet and received by another TCP layer that reassembles the
packets into the original message.
•
The IP layer ensures that each packet has the sender's and the receiver's
Internet address and will get to the right destination.
A transmission protocol that uses an IP address to identify the destination host
and a port number to identify the destination application.
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