{{Short description|Radiocommunication between artificial satellites}} thumb|400px|''Inter-satellite service'' to Earth directly or via three relay satellites orbit.
'''Inter-satellite service, '''also known as '''inter-satellite radiocommunication service''' or '''inter-satellite link (ISL)''', as defined by ''Article 1.22'' of the International Telecommunication Union's (ITU) Radio Regulations (RR), is a radiocommunication service providing links between artificial satellites.<ref>ITU Radio Regulations, Section IV. Radio Stations and Systems – Article 1.22, definition: ''inter-satellite service / inter-satellite radiocommunication service''</ref>
==Classification== In accordance with ''ITU Radio Regulations'' (article 1) variations of this ''radiocommunication service'' are classified as follows: * Fixed service (article 1.20) ** Fixed-satellite service (article 1.21) ** <span style="color:#060;">'''Inter-satellite service'''</span> (article 1.22) ** Earth exploration-satellite service (article 1.51) *** Meteorological-satellite service (article 1.52)
==Satellites== ===Inter-satellite radiocommunications satellites=== * U.S. Tracking and Data Relay Satellite * Artemis (satellite) * European Data Relay System * Indian Data Relay Satellite System * Luch (satellite) (Russia) * Tianlian I (China)
===Commercial satellite constellations with inter-satellite communication=== * Iridium * Starlink * Kuiper Systems
==See also== * Communications satellite * Radio station * Wireless mesh network * Laser communication in space
== References / sources == <references /> * [https://www.itu.int International Telecommunication Union (ITU)] * ''Earth exploration-satellite service.'' ITU, Genf 2011. {{ISBN|92-61-13761-X}}
{{Radiocommunication services ITU}}
Category:Radiocommunication services ITU *