Wegener Communications 6420 - Manual (Page 25)

iPump 6420 User’s Manual
www.wegener.com 800070-01 Rev B Chapter 1, Page 21
Term Definition
Language Descriptor
or LD Identifier for a single component compressed audio stream under an
MPEG Program within a Transport stream.
Linux A modern, open-source (free) operating system (OS). The OS provides
these standardized services to the i6420 application software: 1) access to
the hardware, 2) rations access to the microprocess for the application’s
multiple processes, 3) interrupts the application with events and messages,
4) ration computer resources, and 4) allows standard communication
methods to external hosts.
LAN Local area network. An IP/Ethernet network to which either the i6420
LAN or WAN ports may be connected.
LCD Liquid Crystal Display. Text display technology for i6420 front-panel.
LED Light emitting diode. Display lamps for i6420 front-panel.
LNB Low-noise block downconverter - equipment (generally at the antenna)
that converts the incoming satellite signal to the appropriate frequency for
reception by the
iPump 6420 .
MPEG Moving Pictures Experts Group. Often used to describe a set of
specifications based on ISO 13818-x.
PAT Program Allocation Table. A single metadata structure provided in all
MPEG Transport streams that show what Programs are available.
Permanent Setting A non-volatile setting of the i6420, which has no time limit.
PID Packet ID. Identifies a specific single data stream within an aggregate
MPEG Transport stream.
PMT Program Map Table. A single metadata structure that is provided in
MPEG Transport streams, one such “table” per Program. Gives
information about the media components (video, audios, data, etc.) within
the Program.
Playlist In an i6420, an ordered set of playable media files. When used, the entire
set is played or executed in its entirety.
Program Under MPEG, these are the basic channels under which media is conveyed
in MPEG Transports. Typically, all media services within a Program
share a single time-base.
Program Number An identifier unique to each Program within a Transport.
PPP PPP (Point-to-Point Protocol) is a protocol for communication between two
computers using a serial interface, typically a personal computer connected
by phone line to a server.
QPSK Quadrature-phase-shift-keying. Term usually used to imply the specific
carrier protocol (modulation and FEC) described in DVB specifications
and used world-wide to convey MPEG Transports over satellites.
RF Radio Frequency. Often used as a noun to mean any RF signal, such as the
satellite downlink signal, or the IF signal emitted from the antenna LNB.
Server A computing program that constantly runs, while waiting to deliver, and
then performing the delivery of services to other programs running on the
same or other computers. Also used to describe the computer upon which
a server program is running.
SMB Server message block - a protocol for requesting services from and reading
and writing to a file server. An SMB server can present its files for easy
viewing by Windows Explorer.
Telnet Industry-standard method for communicating between host computers
over IP networks.