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1、IEEE 802.3ah Ethernet in the First Update: Technology andStandards UpdateBruce TolleyManager, Emerging Technologies, GSBUVice President, 10 Gigabit Ethernet AllianceChair, Technical Committee, Ethernet in the First9 October 2002 btolleyAlliance1Catalyst 4000 Enhances Control Announcement SpS 01.02 2

2、002, Cisco Systems, Inc.What is Ethernet in the FirstA Topology(EFM)The first/lastconnection between the customer and thecentral office/head end. Also called metro access, local loop, lastIncludes: Ethernet to the X or ETTX, ETTB (Business), and ETTH (Home)An industry initiativeIEEE 802.3ah Task For

3、ce, 200 engineers, 100+ companiesMultiple Layer 1 and Layer 2 technologiesSome old: 1000BASE-LX, 100BASE-FXSome new: EFMF or P2P, EFMP or P2MP (EPON), EFMCu or EoVDSL, OAM, bidirectional transceiversEthernet/IP transport and Ethernet customer facing interfaces (Ethernet UNIs)2Catalyst 4000 Enhances

4、Control Announcement SpS 01.02 2002, Cisco Systems, Inc.IEEE Standards Work in ProcessIEEE 802.3 Ethernet Working GroupIEEE 802.3ae 10 Gigabit Ethernet Task Force DONE!IEEE 802.3ah Ethernet in the FirstTask ForcePoint-to-point Ethernet over copper and fiber Point-to-multipoint Ethernet on SM fiber (

5、PON*)IEEE802.3af DTE Power Study GroupElectrical power over Cat 5 cabling (up to 15W)IEEE 802.17 Working Group, Resilient Packet Ring (RPR)Defines media access control protocol for SM fiber ringsUses optical interfaces (PHYs) defined by IEEE 802.3z 1 Gigabit Ethernet and IEEE 802.3ae 10 Gigabit Ethe

6、rnetUses existing SONET/SDH layers via HDLC and GFP Is not IEEE 802.3 Ethernet*PON= passive optical networkCatalyst 4000 Enhances Control Announcement SpS 01.023 2002, Cisco Systems, Inc.IEEE 802.3ah EFM Layer Diagram4Catalyst 4000 Enhances Control Announcement SpS 01.02 2002, Cisco Systems, Inc.100

7、0BASE-X PHY100BASE-X PHYCopper PHYsEPON PHYOpticalOpticalCopperOpticalPMDsPMDsPMDsPMDsEthernet Media Independent Interface (MII)optionalMedia Access Control (MAC) Full DuplexIEEE 802.3ah:Ethernet in the FirstGoals (1)Support access network topologies Point to multipoint (P2MP) on optical fiber Point

8、 to point (P2P) on optical fiberPoint to point (P2P) on copperProvide a family of physical layer (PHY) specifications100BASE-X = 10 km over dual and single SM fiber 1000BASE-X extended temperature range optics 1000BASE-X = 10 km over single SM fiber5Catalyst 4000 Enhances Control Announcement SpS 01

9、.02 2002, Cisco Systems, Inc.IEEE 802.3ah:Ethernet in the FirstGoals (2)Provide a family of PHY (contd)PHYs for single-pair, non-loaded, voice-grade copper:Distance = 750 m and speed = 10 Mbps aggregateDistance = 2700 m and speed = 2 Mbps PHYs for PON= 10 km over SM fiber and =16:1 split ratio and=

10、20 km over single SM fiber and =16:1 split ratioSupport far-end OAM in access networksRemote failure indication, Remote loopback, Link monitoring6Catalyst 4000 Enhances Control Announcement SpS 01.02 2002, Cisco Systems, Inc.IEEE 802.3ah IssuesEPONsCopperShort reach goal: EoVDSL PHY Line code wars Q

11、AM vs DMTLong reach goal: ADSL plus or G.SHDSL Forward error correction (FEC)EPON encryption and security requirements7Catalyst 4000 Enhances Control Announcement SpS 01.02 2002, Cisco Systems, Inc.Projectedtones for IEEE 802.3ah Task Force2000200120022003EFM SGFormedPARDraftedWorking Group BallotPA

12、RApproved EFM SG (Ethernet in the First Speed Study Group) PAR (Project Authorization Request) 802.3ahthe name of the project and the name of the sub-committee of IEEE 802.3 chartered with writing the Ethernet in the firsttandard Working group ballottask force submits complete draft to larger802.3 c

13、ommittee for technical review and ballot LMSCLAN/MAN Standards Committee ballot; any member of the superset of 802 committees may vote and comment on draft8Catalyst 4000 Enhances Control Announcement SpS 01.02 2002, Cisco Systems, Inc.802.3ahFormedStandardLMSCBallots and Summary IEEE 802.3ah defines

14、 protocols, PHYs, and PMDs Broad industry participation leads to interoperability Standards process leads to lower costs for Ethernet interfaces in the first9Catalyst 4000 Enhances Control Announcement SpS 01.02 2002, Cisco Systems, Inc.ReferencesIEEE 802.3 web site:Ethernet in the FirstAlliance web

15、 site:Cisco customers building EFM networks including Ethernet to the home (ETTH), Ethernet to the MxU, and Ethernet to the business networks Grant County PUD, Acantho, Fast Web, B2:tworking_solutions_customer_profiles_list.htmlCisco White paper:tworking_solutions_implementation_white_paper09186a008009 d660.shtml10Catalyst 4000 Enhances Control Announ