Advent of 10G Asymmetric EPON BIN YEONG YOON, ETRI GABRIEL SHIN, CMB

Transcription

1 Advent of 10G Asymmetric EPON BIN YEONG YOON, ETRI GABRIEL SHIN, CMB 1

2 Contents Killer application of FTTH Evolution of EPON considering future IPTV services Issues on IPTV Conclusions 2

3 Broadband Subscribers of Korea Broadband deployment of 65% penetration Optical LAN is on increase Cable modem and xdsl are staggering There is no room for EPON due to no killer application Number of Subscribers 14M 12M 10M 8M 6M 4M 2M 0 LAN Cable Modem xdsl 0.6M 3M 4.9M 1M 3.8M 6.2M 0.9M 4M 6.6M 1.2M 4.3M 6.7M 2.1M 4.2M 6.4M

4 IPTV would be a savior Killer application is needed to spur the deployment of EPON IPTV can be one of the candidates Delivery of both broadcast and on-demand TV and video services using Internet protocol IPTV services value will be increased sharply IPTV Revenues in North America (Ovum, 2006) 4

5 Multi-vision Service Multi-channels popped up on the screen simultaneously like browsers on PC Headend 1Gbps ONT Single Vision Internet OLT Current IPTV Headend 10 Gbps ONT Multiple Vision Internet OLT Future IPTV 5

6 Multi-angle service More bandwidth required to provide multi-streams per channel Angle 1 Angle 3 Program Provider Streaming Surfing Angle 2 Angle 4 Streaming Surfing SBS Golf 5 Multi-angled Service Angle 1 Angle 2 Angle 3 Angle 4 Angle 5 6

7 Number of channels increased 7

8 Evolution of EPON More Bandwidth will be required for future IPTV services Multi-vision service Multi-angle service Number of channels increased Evolution of EPON Broadcast Bandwidth Unicast Bandwidth Bandwidth allocation Impact on home networks 8

9 Evolution of EPON Technology Step I : 1Gbps/1Gbps(DS/US) The first commercial FTTH technology with Gigabit bandwidth deployed in the world ONU OLT 1Gbps DOWNSTREAM 1Gbps UPSTREAM PS Single Vision Step II : 10Gbps/1Gbps(DS/US) Advanced digital TV services & CATV replacement ONU OLT 10Gbps DOWNSTREAM 1Gbps UPSTREAM PS Multiple Vision Step III : 10Gbps/10Gbps(DS/US) Cost effective system by more subscribers & more bandwidth for US OLT 10Gbps DOWNSTREAM 10Gbps UPSTREAM PS ONU Multiple Vision 9

10 Broadcast Bandwidth Theoretically, DS bandwidth up to 5Gbps for broadcast services Several hundred Mbps of data services by channel bonding of Data Over Cable Service Interface Specification 3.0 (DOCSIS 3.0) TV PC STB CM (Tap-off) (Splitter) Cable (TBA) HFC network (ONU) Fiber SO QAM modulator QAM modulator CMTS Router PP ISP Cable STB ~ 5 Gbps (Downstream) RF modulation Ch4(f 4 ) Ch1 (f 1 ) Ch4 (f 4 ) Ch135 (f 135 ) 5~42MHz 88~550MHz Analogue CH 550~860MHz Digital CH 10

11 Unicast Bandwidth The ratio of downstream to upstream: Symmetry or Asymmetry? Current State slight asymmetry (~ 2:1) Peer to peer (P2P) service is dominant Future Trends severe asymmetry Revenue generating BW is downstream Asymmetrical HFC capacity: ~ 22:1 IP Transit Capability Downstream Today 40Mb/s IP Transit Capability Today 30Mb/s Upstream DOCSIS 3.0 DOCSIS Gb/s 150Mb/s 6 MHz 750 MHz Spectrum Required 6 MHz 30 MHz Spectrum Required Source: M. Fawaz, CableLabs Media Briefing,

12 Allocation of Bandwidth for 10G Asymmetric EPON Upstream BW: Existing services (1.25Gb: Internet, VoIP etc.) Downstream BW: Existing services(2.5gb), broadcast(5gb), Services generating revenues (2.5Gb: video streaming services, etc.) Revenues generating BW is downstream BW ONT Program Provider IPTV Downstream(10Gb) Broadcast (5Gb) Internet OLT Internet (2.5Gb) PS ONT On-demand, etc. (2.5Gb) EoD, VoD, SoD etc. On-demand Sever Internet (1.25Gb) Upstream(1Gb) ONT 12

13 Impact on home networks 10G EPON triggering business of new technologies such as AV Bridges (Residential Ethernet) and 10GBASE-T Getting rid of coaxial cable for video signal 1G EPON 10GEPON ONT Triplexer L2 SW 100BASE-T ONT Transceiver AV Bridge L2 SW 10GBASE-T 1GBASE-T 10GBASE-T Video signal 13

14 Issues on IPTV Services Evolution of EPON Necessity of 10G asymmetric EPON Asymmetric internet traffic Bandwidth allocation Impact on home networks Issues on IPTV services Channel zapping delay Configurations of networks 14

15 Channel Zapping Delay Channel Zapping Delay is A matter of how quickly end user can change channels Major source of channel zapping delay is multicast leave & join latency Multicast signaling: IGMP for IPv4 or MLD for IPv6 IGMP: Internet Group Management Protocol MLD: Multicast Listener Discovery Channel Zapping Delay = Selected channel traffic received time [t2] IGMP leave message for previous channel transmitted time [t1] IPTV STB Network Equipment Previous channel multicast traffic t1 Channel Select IGMP Leave for previous channel t2 IGMP Join for selected channel Selected channel multicast traffic Channel Zapping Delay [t2 t1] 15

16 Case Studies of Channel Zapping Delay Zapping time between 2 channels at ADSL based IPTV service: 2 ~ 5 s Comparative study of 3 operators in France in July 2004 (Source: Test of Channel Zapping time on condition of large subscribers Tested by Agilent Technologies in order to evaluate channel zapping performance when many subscribers zap channels simultaneously Zapping delay is about 0.9 ~ 70 s depending on configurations of subscribers increased number of subscribers dramatically affects the channel zapping delay (Source: Agilent Technologies Testing IPTV channel zapping ) 16

17 Suppressing Options of Channel Zapping Delay Option 1 1G EPON with FE port at ONT To suppress the channel zapping delay for 10G EPON: It is required to reduce the number of subscribers that try to zap the channel at the same time FE 1G EPON STB ONT OLT MR Selected channel IGMP leave/join Broadcast channel # of IGMP signals from all users: ~ 5,000 Option 2 10G EPON with GE/FE port at ONT GE/FE 10G EPON STB ONT OLT MR # of IGMP signals from ONT/ONU users: ~ 32 Option 3 10G EPON with 10G port at ONT 10G 10G EPON STB ONT OLT MR No IGMP signals Channel zapping as fast as CATV STB: Set Top Box, MR: Multicast Router 17

18 1G EPON for IPTV TV IGMP join/leave Authentication Server Encrypted IPTV IPTV Headend STB ONT 1G EPON OLT Edge Router VoIP Internet Configuration of 1G EPON access network for IPTV Complex networks Complex traffic management of individual IPTV channels IGMP needed Authentication against a channel join attack High cost of network management 18

19 10G EPON for IPTV TV Encrypted IPTV IPTV Headend STB ONT 10G EPON OLT Edge Router VoIP Internet Configuration of 10G EPON access network for IPTV Simple networks like CATV Easy traffic management of just one single virtual path containing all broadcast channels No IGMP Low cost of network management 19

20 Necessity of 10G Asymmetric EPON 10G EPON can support TPS better than any other access technologies Reducing channel zapping delay Avoiding complex networks to support QoS of broadcast services DS traffic should be increased for future broadcast services Multi-visions, multi-angles, and number of channels increased More than 5Gbps allocated for broadcast to keep the same bandwidth as CATV US traffic of customers not allowed to be increased dramatically No high revenue expected from increasing US user traffic Reasonable cost Currently, cost of 10G symmetric EPON system is too expensive to be deployed, compared to 10G asymmetric EPON 20

21 Conclusions IPTV service value will be increased 10G asymmetric EPON well suitable for IPTV Huge 10Gbps DS bandwidth Reducing channel zapping delay Simple access networks Winner or loser CATV trying to increase Internet bandwidth by DOCSIS 3.0 FSAN starting to discuss10gbps GPON on Sep. Optical LAN increased with low cost and easy migration xdsl exceeds the average bandwidth of 1Gbps EPON per subscriber 21