Synchronous Ethernet
G.8262/Y.1362 is an ITU-T recommendation for Synchronous Ethernet that defines "timing characteristics of synchronous Ethernet equipment slave clock (EEC)."[1] It was first published in August 2007, amended in 2008 and 2010, and a new version published in 2010.[1]
Unlike time-division multiplexing (TDM) networks, the Ethernet family of computer networks do not carry clock synchronization information. Several means are defined to address this issue. IETF’s Network Time Protocol, Precision Time Protocol (IEEE 1588) are some of them. Carrier Ethernet services prefer synchronized clocks to fit into traditional synchronous optical networking systems, known as the Synchronous Digital Hierarchy (SDH).[2]
Another protocol with the "Synchronous Ethernet" name was proposed in 2003 with the IEEE 1394 project.[3] It was intended for use in consumer electronics.[4] This proposal was not adopted, but led to the Audio Video Bridging Task Group with the IEEE 802.1 effort instead.[5]
[edit] References
- ^ a b "G.8262 : Timing characteristics of a synchronous Ethernet equipment slave clock". International Telecommunication Union. July 2010. http://www.itu.int/rec/T-REC-G.8262.
- ^ Slobodan Milijevic (March 3, 2009). "An introduction to Synchronized Ethernet". EE Times. http://www.eetimes.com/design/embedded/4008244/An-introduction-to-Synchronized-Ethernet. Retrieved July 9, 2011.
- ^ Pioneer and Gibson (November 10, 2003). "Synchronous Ethernet Specification 0.39". IEEE 1394 group. http://grouper.ieee.org/groups/1394/c/20031216/Sync_Ethernet_039a_draft.pdf. Retrieved July 9, 2011.
- ^ John Gildred (November 21, 2003). "Synchronous Ethernet Overview". IEEE 1394 group presentation. http://grouper.ieee.org/groups/1394/c/20031216/synce_overview.pdf. Retrieved July 9, 2011.
- ^ "Residential Ethernet IEEE802.3 Call for Interest". IEEE 802.3 Residential Ethernet study group. July 2004. http://www.ieee802.org/3/re_study/public/200407/cfi_0704_1.pdf. Retrieved July 9, 2011.
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