Wegener Communications 6420 user manual Glossary of Terms and Abbreviations, Term Definition

iPump 6420 User’s Manual

1.6.Glossary of Terms and Abbreviations

Term		Definition
AFD		Assured File Delivery, the WEGENER system for file downloads through
		satellite channels
Alarm		An indication of a serious fault, generally expected to prevent the i6420
		from fulfilling a basic mission
Application		Term used to describe the controlling software that runs on top of an Linux
		Operating System, and that provides most i6420 functionality.
ASI		A physical interface for MPEG Transport streams, featuring bit-serial
		transmission on a baseband signal with 270 MHz signaling rate. The data
		is sent asynchronously, meaning the interface conveys a data byte when
		available at the sender, and padding bytes otherwise.
Boot Loader		A small program that briefly runs on top of the Linux OS in the i6420 that
		loads and runs the main application.
Carrier		An RF signal whose envelope and phase is modulated (manipulated) in an
		defined fashion in order to convey information.
Client		A program that can be started and ran on a computer that seeks services
		from server programs. Usually human operators will interface directly
		with the client to seek these services.
Compel		WEGENER’s trademark Control system, optimized for control of media
		distribution systems using edge devices such as WEGENER’s iPump 6420.
DVB		Digital Video Broadcast. Term used to represent the methods and
		protocols using MPEG Transport streams to distribute media content over
		satellite
Eb/No		In digital carrier systems, the energy per information-bit divided by the
		channels noise density per Hertz. This is the key figure of merit for signal-
		to-noise ratio.
Ethernet		The widely-used LAN technology specified by IEEE standard 802.3
FEC		Forward Error Correction. A transformation done on a stream or block of
		information, expressed in bits, bytes, or frames, where some small amount
		of redundancy is added. This is done in a manner such that, when the
		transformed (FEC-encoded) stream of data is conveyed over error-prone
		communication links, such as satellite channels, the errors can be removed
		and the original information message recovered.
FTP		File Transfer Protocol. Industry-standard method for transferring files
		between host computers over IP networks.
HTTP		Hypertext Transfer Protocol. This is the protocol supported by web
		servers and clients. It actually describes a set of methods to upload and
		download, not only web pages, but any kind of file. The i6420 uses the
		HTTP POST method to upload files to remote servers, and uses the GET
		method to download files from remote servers.
IP		Internet Protocol. The internetworking protocol that allows host
		computers to communicated over local networks or over the internet.
IRD		Integrated Receiver-Decoder. A product which features a "receiver" to extract
		Transport streams from satellite-borne carriers & a companion "decoder" to
		decompress MPEG elementary streams (from within said transport streams) in
		order to recreate the original audio/video/data signals. The WEGENER Unity 4600
		is an IRD.
	www.wegener.com	800070-01 Rev B	Chapter 1, Page 20