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Video Streaming Service Trial
over ADSL-Based Telephone Networks
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
[email protected]
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
Content
1. Background and Trial Objects
2. MOD Trial system Architecture
3. MOD Major Components
4. Streaming service present Status
5. Conclusion
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
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
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
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
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
Background-Opportunities
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
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
Trial Objects
Verify ADSL network high speed streaming stability&
reliability
Seek out the commercial multimedia system
architecture solutions
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
MOD Trial system Architecture
AMX (Internet)
VPX
10 BT*N
10 BT
OC3
10 BT
OC3
.
.
.
OC3
Service
Manager
Internet
10 BT
OC3
AMX (Video Stream)
Router
ADSL
Modem
POTS
ADSL
Modem
POTS
ADSL
Modem
POTS
ADSL
Modem
POTS
.
.
.
10 BT*M
Video
Server
ATU -C RACK
AMX (User)
AMX (User)
Common
Common
Controller
LAN
Network
Manager
10 BT
.
.
.
Video Server :
Karaoke Server
Pay -Per -View Server
Digital Broadcasting TV Server
Program Downloading
Server
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
MOD Trial system Architecture
Trial Historical information：
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.
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
MOD Trial system Architecture
Trial Service：
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
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
MOD Major Components
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
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
MOD Major Components
LiveTV
ATU-C
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
MOD Major Components
AMX and ATM Switch
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
MOD Major Components
NVOD
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
MOD Major Components
STB
KOD
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
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
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab
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
Chunghwa Telecom Co. Ltd.
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ChungHwa Telecom Labs
Network & Multimedia Lab