Ethernet The Next Generation

Transcription

1 Ethernet The Next Generation John D Ambrosia Chair, IEEE P802.3ba Task Force Scientist Sr., Components Technology Force10 Networks Presented by: Debbie Montano dmontano@force10networks.com

2 Per IEEE-SA Standards Board Operations Manual, January 2005 At lectures, symposia, seminars, or educational courses, an individual presenting information on IEEE standards shall make it clear that his or her views should be considered the personal views of that individual rather than the formal position, explanation, or interpretation of the IEEE.

3 IEEE P802.3ba Objectives Support full-duplex operation only Preserve the / Ethernet frame format utilizing the MAC Preserve minimum and maximum FrameSize of current standard Support a BER better than or equal to at the MAC/PLS service interface Provide appropriate support for OTN Support a MAC data rate of 40 Gb/s Provide Physical Layer specifications which support 40 Gb/s operation over: at least 10km on SMF at least 100m on OM3 MMF at least 10m over a copper cable assembly at least 1m over a backplane Support a MAC data rate of 100 Gb/s Provide Physical Layer specifications which support 100 Gb/s operation over: at least 40km on SMF at least 10km on SMF at least 100m on OM3 MMF at least 10m over a copper cable assembly Adopted by IEEE P802.3ba and approved by at Mar 2008 Plenary

4 IEEE P802.3ba Task Force Timeline You Are Here Task Force Formation Baseline TF Review WG Ballot LMSC Ballot Standard Last Proposal Last Feature Last Technical Change N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N PAR Approved D1.0 D2.0 D3.0 TF Reviews WG Ballots LMSC Ballots * Adopted by IEEE P802.3ba TF at March 08 Plenary Legend IEEE 802 Plenary IEEE Interim IEEE-SA Standards Board

5 Baseline Proposals Selected Draft Outline Nomenclature Architecture PMD service interface for 40GBASE-SR4 / 100GBASE-SR10 XLAUI / CAUI electrical Interface XLGMII / CGMII PCS PMA OTN Support 40G / 100G MMF PMD 100GE 40km SMF PMD 100GE 10km SMF PMD Cu Cable Assembly PMD Backplane PHY

6 Nomenclature Nomenclature for the 3 part suffix Speed 40 = 40Gb/s, 100 = 100Gb/s Medium type Copper K = Backplane C = Cable assembly Optical S = Short Reach (100m) L = Long Reach (10Km) E = Extended Long Reach (40Km) Coding scheme R = 64B/66B block coding Number of lanes or wavelengths Copper: n = 4 or 10 Optical: n = number of lanes or wavelengths n=1 not required as serial is implied Based on: ganga_02_0508.pdf

7 Nomenclature Examples PHY Description 40G Backplane PHY 40G Cable Assembly PHY 100G Cable Assembly PHY 40G MMF 100m PHY (Ribbon) 100G MMF 100m PHY (Ribbon) 40G SMF 10km PHY (4x10G)* 40G SMF 10km PHY (serial)* 100G SMF 10km PHY 100G SMF 40km PHY Port Type 40GBASE-KR4 40GBASE-CR4 100GBASE-CR10 40GBASE-SR4 100GBASE-SR10 40GBASE-LR4 40GBASE-LR 100GBASE-LR4 100GBASE-ER4 * Reference only. Baseline proposal to be selected. Based on: ganga_02_0508.pdf

8 Organization of Project Work Logic Functions Copper PMD functions Short Reach Optical PMDs Long Reach Optical PMDs Amendments to MAC, RS, MAC PHY interface, or baseband layer(s) RS and XLGMII / CGMII XLAUI / CAUI) PCS functions 40GBASE-KR4 (including changes to Clause 73, AN, and Clause 74, FEC) 40G Cu PMD 100G Cu PMD Media characteristics 40GBASE-SR4 100GBASE-SR10 Media characteristics 40GBASE-xxx (10km) 100GBASE-LR4 (10km) 100GBASE-ER4 (40km) Media characteristics PMA functions Interfaces OTN Compatibility Management related to Logic functions (Clauses 30, 45, etc.) Management related to copper functions (Clauses 30, 45, etc.) Management related to PMD functions (Clauses 30, 45, etc.) Management related to PMD functions (Clauses 30, 45, etc.)

9 Overview of Architecture LLC MAC Reconciliation PCS PMA PMD Medium Generalized LAN CSMA/CD Layers Consistent with previous Ethernet rates, extension to 40Gb/s & 100Gb/s data rates Frame format; Services; Management attributes MAC - No changes to the MAC operation PCS PMA PMD Interface Definitions Media Independent Interface (MII) XLAUI / CAUI Service Interfaces Provide appropriate support for OTN

10 Adopted Baseline: Architecture Adopted Proposal: ganga_01_0508.pdf

11 Adopted Baseline: Media Independent Interface (MII) Example 100GbE CSMA/CD Layers Source: gustlin_02_0508.pdf

12 Adopted Baseline: Physical Coding Sublayer (PCS) Example 100GbE CSMA/CD Layers 10GBASE-R 64B/66B based PCS Run at 100Gbps or 40Gbps serial rate Includes 66 bit block encoding and scrambling Multi-Lane Distribution Data is distributed across n virtual lanes 66 bit blocks at a time Round robin distribution Periodic alignment blocks are added to each virtual lane to allow deskew in the rx PCS PMA maps n lanes to m lanes PMA is simple bit level muxing Does not know or care about PCS coding Alignment and static skew compensation is done in the Rx PCS only Based on: gustlin_01_0508.pdf

13 Adopted Baseline: Physical Medium Attachment (PMA) Must contend with PMA variations: Rate dependent PMD dependent Implementation dependent, i.e. XLAUI / CAUI Parameterized PMA 40GbE CSMA/CD Layers 100GbE CSMA/CD Layers Source: gustlin_01_0508.pdf

14 Adopted Baseline: XLAUI / CAUI Example 100GbE CSMA/CD Layers Chip-to-chip interface n x 10G interface May also be used for chip-to-module interfaces (dependent on applications) Retimed interface Must be bounded by PMA on each end Operates over 8 to 12 inches of FR-4 (material dependent) Leverage off development efforts in XFP / SFP+ Based on: ghiasi_01_0508.pdf

15 Adopted Baseline: PMD Service Interface Example 100GbE CSMA/CD Layers and MMF Implementation Used with 40GBASE-SR4 and 100GBASE-SR10 Leverage SFP+ and 8GFC common module form factor for MMF and Cu Cabling Enables direct connection between MAC and module (needed due to density / power) Supports 4 inches of FR-4 Based on: petrilla_01_0508.pdf

16 Adopted Baseline: Appropriate Support for OTN Key Elements of OTN support Lane Independent PCS Part of MLD already! 40 GbE must fit into OPU3 payload Transcoding (to be specified by ITU-T SG15) Proposes coordination between ITU-T SG15 and IEEE on control block types. Coordination pending concurrence of 802.3WG Lane marker transparency for 40 GbE ITU-T decision, but maintain spare value of control block types for encoding lane markers Link fault signaling for 802.3ba Ethernet over OTN can use mechanisms in Clause 46 Based on: trowbridge_01_0508.pdf

17 Summary: Physical Layer Specifications 40GbE 100GbE Baseline Adopted At least 1m backplane At least 10m cu cable Solution Space 4 x 10 Gb/s Re-use of 10GBASE-KR n x 10 Gb/s Re-use of 10GBASE-KR At least 100m OM3 MMF n x 10 Gb/s At least 10km SMF 4 x 10 Gb/s? 2 x 20 Gb/s? Serial 40Gb/s? At least 10km SMF 4 x 25 Gb/s At least 40km SMF 4 x 25 Gb/s

18 Adopted Baseline: 40G Backplane PHY Ethernet solution Gigabit Ethernet to 40 Gigabit Ethernet Leverages 10GBASE-KR 4 lanes Auto-negotiation FEC (optional) Same Tx / Rx electrical characteristics and testing Same interconnect characteristics Appropriate changes to add EEE when P802.3az adopts for KR Adopted Proposal: mellitz_01_0508.pdf

19 * Based on Chris Di Minico, diminico_01_0307 Adopted Baseline: 40G / 100G > 10m Cu Cable PMD Leverage 10GBASE-KR PHY 40GBASE-CR4: 4 x 10 Gb/s 100GBASE-CR10: 10 x 10 Gb/s Cable parameters based on 10GBASE- CX4, final values TBD Optional FEC sublayer AN Reuse 10GBASE-KR (Clause 73) Parallel detect scheme for 10GBASE-CX4? 4x MDI QSFP: enables common form factor for fiber / copper (Quad Small Form-factor Pluggable) 10GBASE-CX4: copper cabling 10x MDI SFF-8092: enables common form factor for fiber / copper

20 40GBASE-SR4 Adopted Baseline: 40G / 100G > 100m MMF (OM3) PMD 4 Tx / 4 Rx Parallel lanes over OM3 ribbon fibers 100GBASE-SR10 4 Tx / 4 Rx Parallel lanes over OM3 ribbon fibers Baseline enables limited non-retimed interface. Cited as highest density, lowest power, lowest cost 100m solution today. Issue interest in going beyond 100m, but no objective How? Tighten specs? OM4 fiber? EDC? Retimers? Extended Reach Parallel MMF Ad-Hoc formed. Baseline proposal: pepeljugoski_01_0508

21 Adopted Baseline: 100G > 10km SMF PMD ITU G specification 800 GHz spacing Wavelengths: 1295, 1300, 1305, 1310nm Shifted by 10nm from reference grid Same grid as 40km Gen1 10km 1310nm EML PMD Development of 25G electrical signaling will drive Gen 2 development Baseline proposal: cole_01_0508

22 Adopted Baseline: 100G > 40km SMF PMD ITU G specification 800 GHz spacing Wavelengths: 1295, 1300, 1305, 1310nm Shifted by 10nm from reference grid Same grid as 10km Gen1 40km 1310 nm PMD Development of 25G electrical signaling will drive Gen 2 development Baseline proposal: cole_01_0508

23 Proposals: 40G > 10km SMF PMD Three proposals: 4 x 10G CWDM approach (cole_03_0708): leverages existing 10GE technology to achieve lowest cost PMD in the near/mid term 2 x 20G approach (dawe_01_0708): compromise Serial 40G approach (traverso_02_0708): leverages CMOS integration cost curve and single optics to achieve lowest cost PMD in the mid/long term July Plenary Motion for 4x10 CWDM All (y/n/a): 81 / 38 / (y/n/a): 52 / 22 / 8 Motion Fails

24 Proposals: 40G > 10km SMF PMD Risk when is the cost crossover? 40GbE for server aggregation must compete with 4 x 10GbE LAG 100 GbE Target costs key to early adoption Some looking to use 40 GbE elsewhere and favor long term thinking. Source: cole_04_0708

25 Summary Remaining Proposal to adopt 40G over > 10km SMF Other Big Ticket Items Issues being considered by Extended Reach Parallel MMF Ad-Hoc August 25 Preview version of proposed text released to Task Force Targeting baseline specification adoption out of Sept 08 Interim Meeting

26 Thank You