Generic Stream Encapsulation: Difference between revisions

Revision as of 10:35, 20 September 2011

Revision as of 10:45, 20 September 2011

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{{cleanup|date=May 2011}}

{{IPstack}} '''Generic Stream Encapsulation''', or GSE for short, is a [[Data link layer]] protocol defined by [[Digital Video Broadcasting|DVB]]. GSE provides means to carry packet oriented protocols, like for example [[Internet Protocol|IP]], on top of uni-directional [[physical layer]]s like e.g. [[DVB-S2]], [[DVB-T2]] and [[DVB-C2]].

GSE also provides additional features beyond the pure carriage of IP datagrams that increase the protocol flexibility and applicability. Some key GSE functions/characteristics are:

The [[protocol]] [[specification]] has been published as [[ETSI]] TS

102 606 <ref name="ts102606">ETSI TS 102 606: "Digital Video

Broadcasting (DVB); Generic Stream Encapsulation (GSE)

Protocol"</ref>. An accompanying [[implementation]] [[guidelines]]

document has been published as [[ETSI]] TS 102 771<ref name="ts102771">ETSI TS 102 771: "Digital Video Broadcasting (DVB); Generic Stream Encapsulation (GSE) implementation guidelines"</ref>.

GSE also provides additional features that increase the protocol flexibility and applicability. Some key GSE functions/characteristics are:

* Support for multi-protocol encapsulation ([[IPv4]], [[IPv6]], [[MPEG]], [[Asynchronous Transfer Mode|ATM]], [[Ethernet]], [[IEEE 802.1Q|802.1pQ]] [[VLAN]]s, etc.)

* Transparency to network layer functions, including [[Internet Protocol|IP]] [[encryption]] and IP [[Van Jacobson TCP/IP Header Compression|header compression]].

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[[File:GSE diagram.png|right|thumb|400px|alt=Diagram of GSE encapsulation and fragmentation|How GSE carries datagrams and is carried in the physical layer]]

The [[protocol]] [[specification]] has been published as [[ETSI]] TS

102 606 <ref name="ts102606">ETSI TS 102 606: "Digital Video

Broadcasting (DVB); Generic Stream Encapsulation (GSE)

Protocol"</ref>. An accompanying [[implementation]] [[guidelines]]

document has been published as [[ETSI]] TS 102 771<ref name="ts102771">ETSI TS 102 771: "Digital Video Broadcasting (DVB); Generic Stream Encapsulation (GSE) implementation guidelines"</ref>.

IP datagrams, Ethernet Frames, or other network layer packets are encapsulated in one or more GSE Packets. The encapsulation process adds control information such as the network protocol type and address label, and provides an overall integrity check when needed.