Generic Stream Encapsulation: Difference between revisions

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{{External links|date=September 2022}}

{{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 such as [[Internet Protocol|IP]] on top of uni-directional [[physical layer]]s such as [[DVB-S2]], [[DVB-T2]] and [[DVB-C2]].

GSE provides additional features beyond the pure carriage of IP datagrams 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]].

* Support of several addressing modes. In addition to the 6-byte [[MAC address]] (including [[multicast]] and [[unicast]]), it supports a MAC address-less mode, and an optional 3-byte address mode.

* A mechanism for fragmenting [[Internet Protocol|IP]] [[datagrams]] or other [[network layer]] [[Packet (information technology)|packets]] over [[baseband|Base Band]] frames to support [[Link adaptation|ACM]]/[[Variable Coding and Modulation|VCM]].

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| colspan="8" bgcolor="#CCFFCC"| Total Length

| colspan="16" bgcolor="#CCFFCC"| Protocol Type

| colspan="8" bgcolor="#CCFFCC"| Label (3 Bytebytes)

|-

! 64

| colspan="16" bgcolor="#CCFFCC"| Label (continuation, length 3 Bytebytes)

| colspan="16" bgcolor="#AADDBB"| Label (continuation, length 6 Bytebytes)

|-

! 96

| colspan="8" bgcolor="#AADDBB"| Label (continuation, length 6 Bytebytes)

| colspan="24" bgcolor="#FFBBBB"| [[Unidirectional Lightweight Encapsulation|ULE]] Extension Headers (Optional)

|-

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|-

| 11

| style="text-align:left" | Label re-use: no label is present; the label is the same as the previous GSE packet in the same base band frame. LT=11 is also used for intermediate and end packets (''i.e.'' Start bit 0). LT=11 shall not be used for the first GSE packet in a base band frame with Start bit 1.

|-

|}

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Here is a (very likely incomplete) list of GSE en- and decapsulators:

* [https://web.archive.org/web/20120517023254/http://www.newtec.eu/ Newtec]

** [http://www.newtec.eu/products/professional-equipment/elevation/modems/ip-satellite-modem-el470/ EL470 IP Satellite Modem]

** [http://www.newtec.eu/products/professional-equipment/elevation/demodulators/ip-satellite-demodulator-el970/ EL970 IP Satellite Demodulator]

* [http://www.work-microwave.de/ WORK Microwave GmbH]

** [http://www.work-microwave.de/dvb-s_s2.html#modems Challenge Series Satellite High Speed DVB-S2 IP Modem SK-IP] {{Webarchive|url=https://web.archive.org/web/20110410220742/http://www.work-microwave.de/dvb-s_s2.html#modems |date=2011-04-10 }}

* [http://www.tebkom.at/ Tebkom GmbH]

** [https://web.archive.org/web/20150707163826/http://www.tebkom.at/product_odg.html ODG200 IP/DVB-S2 Encapsulator/Modulator with ACM support]

* [http://www.advantechwireless.com/ Advantech Wireless Inc.]

** [https://web.archive.org/web/20110903085805/http://www.advantechwireless.com/catalogue/products/amt75e-dvb-ss2-high-speed-broadcast-modem-2/ AMT 75e DVB-S/S2 High Speed Broadcast Modem]

* [http://www.comtechefdata.com/ Comtech EF Data Corporation]

** [http://www.comtechefdata.com/products/Advanced-VSAT-Series/pcdm-840.asp CDM-840 Remote Router]

* [http://www.transplaneta.com/ K.S.Transplaneta Ltd.]

** [https://web.archive.org/web/20120322130601/http://www.transplaneta.com/products/ip-encapsulator dpi4502 DVB2 (S2/T2/C2) compliant IPv4 / IPv6 Encapsulator]

* [http://dveo.com/ Computer Modules, Inc.]

** [http://dveo.com/broadcast-systems/ip-over-dvb-encapsulator.shtml DVB Rocket™/S2]

* [http://www.ayecka.com/ Ayecka Communication systems LTD]

**[http://ayecka.com/products-SR1.php#SR1 SR1 - Advance DVB-S2 demodulator with hardware based , wire speed, GSE Decapsulator]

**[http://ayecka.com/products-ST1.php#ST1 ST1 - Advance DVB-S2 modulator with hardware based, wire speed, GSE encapsulator]

**[http://ayecka.com/products-SM1.php SM1 - Advance DVB-S2 Modem with hardware based, wire speed, GSE EnCapsulator / DeCapsulator]

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* [http://www.dvb.org/technology/standards/index.xml#multiplexing Obtain GSE Standard and Guidelines from DVB free of charge]

* [http://www.dvb.org/technology/fact_sheets/DVB-GSE-Fact-Sheet.0709.pdf DVB Fact Sheet on GSE]

* [https://web.archive.org/web/20110722013509/http://telecom.esa.int/telecom/www/object/index.cfm?fobjectid=30265 GSE project home page] at [[ESA]]]

* [https://forgegithub.net4sat.orgcom/opensandCNES/libgse Opensource implementation of GSE]

[[Category:Articles created via the Article Wizard]]

[[Category:Television technology]]

[[Category:Link protocols]]