100 pv2002 1

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Kou-Sou Kan (Ph.D)*, Cheng-Dow Hwang, Chi-Shi Liu, Bing-Shan Crien,Yin-Hwa Huang, Her-Hsiung Chang, Ta-kang Ju ＊ChungHwa Telecom Co., Ltd. TeleCommunication Laboratories Internet & Multimedia Application Tech. Lab. Researcher, 342 Project Manager 12,Lane 551, Min-Tsu Road Sec. 5 Yang-Mei, Taoyuan, Taiwan 326, R.O.C TEL:886-3-4244782;FAX:886-3-4245801 can@chttl.com.tw Video Streaming Service Trial over ADSL-Based Telephone Networks

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Content Background and Trial Objects MOD Trial system Architecture MOD Major Components Streaming service present Status Conclusion

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Background-Crisis Traditional Voice Service Income is Saturated Telecom Deregulation Policy Impact Mobile Phone Service is opened since 1996 3 new competitors Market occupation drop to 29% Income drop to 36% Telecomm. Service is opened since 1999 3 new competitors International call drop 30% Bandwidth limitation of Twisted pair loop Dialup Internet block the telephone service Difficult to provide high bandwidth multimedia service

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Background-Crisis Service Competition from Cable Company 2 major competitors Widely deployed coaxial cable to cities and communities Internet service at the speed more than 10 Mbps with cable modem Hold most of the cable TV channel license

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The largest Twisted Pair Access Loop Owner Primary asset of old telecom. Over 12 million lines Access Loop upgrade with ADSL Aggressive deployment over 1 Million ADSL lines on 2001 Additional 1.25 Million Lines will be installed on 2002 The largest internet service provider Over 1 million ADSL users and 3 million dialup users 85 % Market Occupation ADSL can break the barrier for MM on Internet Provides a second line service on the same twisted pair Sufficient capacity for multimedia services especially for video No impact on the telephony service on the same line BW asymmetry suited for consultation and client-server applications Background-Opportunities

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Verify ADSL network high speed streaming stability& reliability Seek out the commercial multimedia system architecture solutions Trial Objects

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MOD Trial system Architecture

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Residential ADSL loops in central Taipei city Phase 1 1996~1998 Subscriber number 28 T1-based ADSL Down stream is 1.5 Mbps,upstream is 9.6Kbps through RS232 Phase 2 1998~2000 Subscribe number is increased to 400 Uniformly distributed within 7 End Office (EO) 48 to 64 subscribers per EO Video services are decoded by STB and presented on TV PC based High speed Internet access ADSL downstream is 1.5 Mbps and upstream is 74 Kbps. MOD Trial system Architecture Trial Historical information：

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High speed internet access downstream 1.5 Mbps upstream 72Kbp Near-Video-On-Demand (NVOD) Multicast 1.5 Mbps MPEG-1 180 channel(~ 8 movies) Live TV Multicast 1.5 Mbps MPEG-1 30 channels of cable TV program Karaoke-On-Demand (KOD) Unicast 1.5 Mbps MPEG-1 stream 32 channels MOD Trial system Architecture Trial Service：

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Core switch(VPX) Setup a QoS connection between customer and video server ATM switch 32×32 5 Gbits(OC-3c per port ) Common Controller of VPX (VPX-CC) manages the PVC connections multicast and unuicast connections of the VPX and the AMX. ATM Multiplexer(AMX) Provide STM-1 to 10 BASET termination between the VPX and ATU-C 16 lines of 10 BASET ports for single AMX 7 AMXs are deployed at distant EO to provide at most 448 users Service management System(SMS) The portal site Relay PVC connection request of IGMP multicast and unicast Monitor the system operating status Component failure Alert MOD Major Components

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ATU-C LiveTV MOD Major Components

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AMX and ATM Switch MOD Major Components

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NVOD MOD Major Components

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KOD STB MOD Major Components

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Trail Experiences Scalable issue of ATM Multicast protocol is proprietary for special purpose Automatic routing for new service is required SVC or PVC issue(connection and disconnection respond time) QoS requires PVC connection Mesh connection is required for each service type to guarantee QoS Almost all internet service is IP based ATM are layer2 service Layer 3 and Layer 2 protocols translation(SAR)for IP service ADSL bandwidth is limited within certain connection distance VBR cause packet lost Streaming service must be restricted to CBR

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Conclusion GSR is suitable for IP based multimedia service Scalable expansion for both subscriber and service Very flexible for new service creation Automatic Routing rule Over-engineering to overcome the QoS issue Distribution of service platform to multiple EOs Disperse the traffic load from backbone to local Content related issues are essentially important Management and delivery mechanism(CDN) Conditional access, encryption,decryption Digital Rights Protection(DRM) Retrieval, Segmentation, Indexing, Sorting Format transformation