The Unidirectional Lightweight Encapsulation (ULE) is a
Data link layer
The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking. This layer is the protocol layer that transfers data between nodes on a network segment across the physical layer. The data link layer ...
protocol for the transportation of network layer packets over
MPEG transport stream
MPEG transport stream (MPEG-TS, MTS) or simply transport stream (TS) is a standard digital container format for transmission and storage of audio, video, and Program and System Information Protocol (PSIP) data. It is used in broadcast syste ...
s.
Because of the very low protocol overhead, it is especially suited for IP over Satellite services (where every bit counts). Such a system is for example
DVB-S
Digital Video Broadcasting – Satellite (DVB-S) is the original DVB standard for Satellite Television and dates from 1995, in its first release, while development lasted from 1993 to 1997. The first commercial applications was by Star TV in As ...
. However, ULE can also be used in the context of
DVB-C
Digital Video Broadcasting - Cable (DVB-C) is the DVB European consortium standard for the broadcast transmission of digital television over cable. This system transmits an MPEG-2 or MPEG-4 family digital audio/ digital video stream, using a ...
and
DVB-T
DVB-T, short for Digital Video Broadcasting – Terrestrial, is the DVB European-based consortium standard for the broadcast transmission of digital terrestrial television that was first published in 1997 and first broadcast in Singapore in Feb ...
, theoretically in every system which is based on MPEG transport streams (e.g.,
ATSC
Advanced Television Systems Committee (ATSC) standards are an American set of standards for digital television transmission over terrestrial, cable and satellite networks. It is largely a replacement for the analog NTSC standard and, like that ...
).
ULE has been engineered by the
IP over DVB
IP over DVB implies that Internet Protocol datagrams are distributed using some digital television system, for example DVB-H, DVB-T, DVB-S, DVB-C or their successors like DVB-S2. This may take the form of IP over MPEG, where the datagrams are tran ...
(ipdvb) working group of the
Internet Engineering Task Force
The Internet Engineering Task Force (IETF) is a standards organization for the Internet and is responsible for the technical standards that make up the Internet protocol suite (TCP/IP). It has no formal membership roster or requirements and ...
(IETF) and has been standardized in RFC 4326.
Another encapsulation method is
Multiprotocol Encapsulation {{IPstack
Multiprotocol Encapsulation, or MPE for short, is a Data link layer protocol defined
by DVB which has been published as part of ETSI EN 301 192. It
provides means to carry packet oriented protocols (like for instance
IP) on top of MPEG ...
(MPE) which was developed and standardized by the
DVB project.
See also
*
MPEG-2
MPEG-2 (a.k.a. H.222/H.262 as was defined by the ITU) is a standard for "the generic coding of moving pictures and associated audio information". It describes a combination of lossy video compression and lossy audio data compression methods, w ...
*
Generic Stream Encapsulation (GSE)
*
Multiprotocol Encapsulation {{IPstack
Multiprotocol Encapsulation, or MPE for short, is a Data link layer protocol defined
by DVB which has been published as part of ETSI EN 301 192. It
provides means to carry packet oriented protocols (like for instance
IP) on top of MPEG ...
(MPE)
*
Datacasting
Datacasting (data broadcasting) is the broadcasting of data over a wide area via radio waves. It most often refers to supplemental information sent by television stations along with digital terrestrial television (DTT), but may also be app ...
*
Internet Protocol Datacasting
Datacasting (data broadcasting) is the broadcasting of data over a wide area via radio waves. It most often refers to supplemental information sent by television stations along with digital terrestrial television (DTT), but may also be applied ...
(IPDC) for
DVB-H
DVB-H (Digital Video Broadcasting - Handheld) is one of three prevalent mobile TV formats. It is a technical specification for bringing broadcast services to mobile handsets. DVB-H was formally adopted as ETSI standard EN 302 304 in November 20 ...
*
UDcast
*
Interactive television
Interactive television is a form of media convergence, adding data services to traditional television technology. It has included on-demand delivery of content, online shopping, and viewer polls. Interactive TV is an example of how new informatio ...
Implementations
Software:
Linux Kernel
The ipdvb Working Group maintains a list o
References
{{Reflist
External links
IP over DVB (ipdvb) Working Group
MPEG
Broadcast engineering
Interactive television
Link protocols
Logical link control