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10G-EPON Standardization and Its Development Status © 2009 OSA/OFC/NFOEC 2009 NThC4.pdf 10G-EPON Standardization and Its Development Status Keiji Tanaka KDDI R&D Laboratories Inc. [email protected] Outline 1. Background and motivation 2. IEEE 802.3av standardization 3. Research activities 4. Development status 5. Summary ᵐ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo 978-1-55752-865-0/09/$25.00 ©2009 IEEE 1 Outline 1. Background and motivation (a) FTTH growth in Japan (b) FTTH systems (c) Why 10G-EPON necessary? (d) When 10G-EPON feasible? 2. IEEE 802.3av standardization 3. Research activities 4. Development status 5. Summary ᵑ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo FTTH growth in Japan The number of FTTH lines, more than 13 million at the end of Sep. 2008, exceeded the number of DSL lines in 2Q/2008. 20 Shifted to decrease StatisticsStatistics asas ofof Sep.Sep. 20082008 DSL 15 $ Number of lines: FTTH: 13.8 M DSL: 12.0 M FTTH CATV: 4.0 M 10 (Mobile: 92.0 M) $ Number of operators: FTTH: 171 5 CATV DSL: 47 CATV: 381 Number of broadband users [Million] 0 ‘02 ‘03 ‘04 ‘05 ‘06 ‘07 ‘08 ‘09 ‘10 Year Source: Ministry of Internal Affairs and Communications statistics database ᵒ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo 2 Flavors of FTTH systems High WDM-PON Apartment Data rate SS (Bandwidth) TDM-PON VDSL Efficiency High DSLAM Optical access system VDSL CPE 100Mbit/s CO or Residential house SS 1Gbit/s Media converter Single star Media converter Media converter Power Power splitter splitter Optical fiber PON Passive double star PON-OLT Power splitter PON topology is suitable for accommodating a lot of users and distributing broadcasting video services. ᵓ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo Why 10G-EPON necessary? Why 10Gbps? Optical feeders with bandwidth of ~10Gbps are necessary for $ Advanced video services $ Multi-service platform to accommodate MDUs and mobile APs Why PON? PON reduces CAPEX and OPEX $ Accommodates a large number of FTTx users and mobile APs efficiently $ Reduces the footprint and power consumption of CO equipment $ Reduces fiber deployment and repair cost ᵔ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo 3 Digital television Access network must grow beyond 1Gbps to provide advanced video services such as digital cinema. CFI, March 2006, IEEE802.3 ᵕ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo Multi-service platform Next-generation access is expected to work as a multi-service platform in which multiple dwelling units (MDUs) and wireless access points (APs) are accommodated to reduce CAPEX and OPEX of the infrastructure. A large bandwidth is required for next-generation access network. 3.5G-mobile Wireless backback-haul-haul 10G-EPON LTE, WiFi, WiMAX ONU 10G-EPON Business users OLT 10G-EPON (GbE, 10GbE) ONU Business 10G-EPON 10G-EPON Consumer ONU ONU CMTS DSLAM xDSL - FTTx Residential users - xDSL ᯘHDTVᯙ - Cable Cable Apartment ᵖ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo 4 When 10G-EPON feasible? 10G-EPON would be commercially feasible in 2011~2012, judging from the speed evolution of Ethernet and commercial FTTH services. 1T 100GBase 100G 10GBase-T/LRM NGA-2 10GBase-X/R/W 10G-EPON 10G NGA-1 Ethernet 1G 1000Base-X/T FTTH 100M 100Base-T Transmission rate [bps] 10M 10Base-T ADSL 1M 1990 1995 2000 2005 2010 2015 Year ᵗ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo Outline 1. Background and motivation 2. IEEE 802.3av standardization (a) Overview of PON (b) EPON layering diagram (c) Overview of IEEE 802.3av project (d) Ad-hoc activities in IEEE 802.3av (e) Next-generation access in ITU-T 3. Research activities 4. Development status 5. Summary ᵏᵎ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo 5 Operation of TDM-based PON Each ONU extracts the frames destined to each 1 Each ONU extracts the frames destined to each 1 ONU selectively. (Other frames are discarded.) ᛷ Optical splitter ONU To split and combine optical signals 3 ᛷ 2 EachEach ONUONU sendssends framesframes withinwithin All frames are broadcast All frames are broadcast 1 assignedassigned timeslot.timeslot. CO toto eacheach branch.branch. OLT Downstream 2 1 2 3 1 2 3 2 ᛹ ᛸ ᛷ ᛸ ᛸ Upstream 1 ONU Bidirectional transmission All frames are aligned ᛹ 2 over single optical fiber so as to avoid collision. 3 Upstream Downstream 3 1260-1360nm 1480-1500nm 3 Wavelength Customer ᛹ (nm) 1300 1400 1500 1600 Premise ONU Wavelength allocation in EE-/B-/G-PON-/B-/G-PON systemssystems ᵏᵏ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo Flavors of PONs B-PON (ITU-T) ATM cell (53 byte) Ethernet frame OLT ONU ATM cell A fixed-length GTC frame consists G-PON (ITU-T) GTC frame of ATM cells and GEM frames. 125 s OLT ONU Ethernet frame Frames except ATM cells are contained in variable- GEM: G-PON encapsulation method GEM frame length GEM frame GTC: G-PON transmission convergence EPON (IEEE) EPON (IEEE) Ethernet frame Ethernet frame OLT ONU ᵏᵐ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo 6 IEEE802.3 layering diagram $ IEEE 802.3 only covers physical layer and a portion of data link layer. $ IEEE 802.3av mainly focuses on physical layer (PMD, PMA, PCS, and RS). To be exact, IEEE802.3av slightly covers a portion of data link layer (MPCP). OSI Reference model IEEE 802.3 Layering diagram Logical Link Control MAC Control Application Media Access Control (MAC) Presentation Reconciliation Session Gigabit Media Independent Interface (GMII) Transport Physical Coding Sublayer (PCS) Main scope of Network Physical Medium Attachment (PMA) IEEE 802.3av Scope of Data Link Physical Medium Dependent (PMD) Medium Dependent Interface (DMI) IEEE802.3 Physical Medium ᵏᵑ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo EPON layering diagram Logical link layer topology is point-to-point with the use of logical link IDs (LLIDs), although physical media topology is point-to-multipoint. OLT ONU#1 ONU#N LLID #1 LLID #N Mac Client Mac Client Mac Client Mac Client OAM OAM OAM OAM Point-to-point MPCP MPCP MPCP MAC MAC MAC MAC RS RS RS PCS PCS PCS PMA PMA PMA PMD PMD PMD Optical splitter Point-to- Optical fiber Optical fiber multipoint ᵏᵒ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo 7 Frame format in EPON LLID for logical topology emulation is embedded in the preamble portion of Ethernet frame (IEEE802.3 frame). 8 octet 6 62 46῍1500 4 Destination Source Preamble / SFD Type Data FCS Address Address SFD 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0xd5 EthernetEthernet SLD 0x55 0x55 0xd5 0x55 0x55 LLID LLID CRC8 EPONEPON SFD: Start of Frame Delimiter FCS: Frame Check Sequence SLD: Start of LLID Delimiter Format of frame preamble in EPON LLID: Logical Link Identifier CRC8:8bit Cyclic Redundancy Check ᵏᵓ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo IEEE802.3av project What 10G-EPON ? 10x higher-speed standard of IEEE802.3 EPON $ IEEE 802.3av mainly focuses on physical layer for 10Gbps transmission. (Formerly named “10Gbps PHY for EPON” ) $ Frame format, MAC, OAM are basically the same as IEEE802.3 EPON. Timeline Expected standard approval : September 2009 2006 2007 2008 2009 Study Task force P802.3av Group CFI PAR Draft0.9 Draft1.0 Draft2.0 Draft3.0 Std Project Baseline 1st draft Last Last tech. start proposal feature change CFI : Call For Interest PAR : Project Authorization Request ᵏᵔ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo 8 Objectives of IEEE802.3av $ Support subscriber access networks using point to multipoint topology on optical fiber Fully compatible with existing ODNs $ PHYs to have a BER better than or equal to 10-12 at the PHY service interface $ Provide physical layer specificationᯪ - PHY for PON, 10Gbps downstream / 1Gbps upstream, single SM fiber - PHY for PON, 10Gbps downstream / 10Gbps upstream, single SM fiber Asymmetric 10G-EPON Symmetric 10G-EPON 10Gbps 10Gbps 10Gbps 1Gbps $ Define up to 3 optical power budgets that support split ratios of 1:16 and 1: 32, and distances of at least 10 and at least 20 km. 1:16 1:32 10km PR10 , PRX10 PR20 , PRX20 20km PR20 , PRX20 PR30 , PRX30 ᵏᵕ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo Co-existence Co-existence issues are seriously considered in IEEE802.3av specifications: $ Co-exist with deployed systems of 1G-EPON and RF video on the same ODN $ Reuse of deployed optical distribution network (ODN) (1) To co-exist with 1G-EPON and RF video, the followings are adopted: - Downstream : WDM (L-band) - Upstream : 10G/1G dual-rate TDMA (2) For the reuse of deployed ODN, a new power budget class is specified: - PR/PRX30 (Loss budget : 29dB) Downstream RF-Video RF-Video (1.55mm) V-ONU 10G (L-band) 10G/10G PON-OLT 1G (1.49mm) ONU 10G/1G Dual-rate ONU Burst Rx 1G(1.31mm) 10G(1.27mm) 1G/1G Upstream ONU ᵏᵖ K.Tanaka, OFC/NFOEC 2009, Mar. 23-26, 2009 All Rights Reserved © 2009 KDDI, Tokyo 9 Main differences between 1G- and 10G-EPON 1G-EPON 10G-EPON channel coding 8B10B 64B66B (coding overhead) (25%) (3%) 10G/10G-symmetric data rate (DS/US) 1G/1Gbps-symmetric + 10G/1G-asymmetric split ratio 1:16 1:16 / 1:32 (*1) 2 3 # of power budget class (PX10 / PX20) (PR10 / PR20 / PR30) option mandatory FEC RS(255, 239) RS(255, 223) US 1260 ~ 1360 nm 1260 ~ 1280 nm (*2) wavelength DS 1480 ~ 1500 nm 1575 ~ 1580 nm (*1) only for PR/PRX30 (*2) asymmetric 10G-EPON : 1260 ~ 1360 nm ᵏᵗ K.Tanaka, OFC/NFOEC 2009, Mar.
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