chunghwa telecom co. ltd. chunghwa telecom labs

1Chunghwa Telecom Co. Ltd. ChungHwa Telecom LabsNetwork & Multimedia Lab

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. 5Yang-Mei, Taoyuan, Taiwan 326, R.O.C

TEL:886-3-4244782;FAX:[email protected]

Video Streaming Service Trial Video Streaming Service Trial over ADSL-Based Telephone Networksover ADSL-Based Telephone Networks


Content

1. Background and Trial Objects

2. MOD Trial system Architecture

3. MOD Major Components

4. Streaming service present Status

5. Conclusion


Background-Crisis

Traditional Voice Service Income is SaturatedTelecom Deregulation Policy Impact Mobile Phone Service is opened since 19963 new competitorsMarket occupation drop to 29%Income drop to 36%Telecomm. Service is opened since 19993 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


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


The largest Twisted Pair Access Loop OwnerPrimary asset of old telecom.Over 12 million lines

Access Loop upgrade with ADSLAggressive deployment over 1 Million ADSL lines on 2001Additional 1.25 Million Lines will be installed on 2002

The largest internet service providerOver 1 million ADSL users and 3 million dialup users 85 % Market Occupation ADSL can break the barrier for MM on InternetProvides 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


Verify ADSL network high speed streaming stability& reliability

Seek out the commercial multimedia system architecture solutions

Trial Objects


MOD Trial system Architecture

ADSLModem10 BT

ADSLModem10 BT

.

.

.

RouterInternet

.

.

.

AMX (User)AMX (Internet)

AMX (Video Stream)

10 BT*MVideoServer

10 BT*N

CommonController

OC3

OC3

OC3

OC3

VPX

AMX (User)

ADSLModem10 BT

ADSLModem10 BT

POTS

POTS

POTS

POTS

.

.

.

ServiceManager

Network Manager

Video Server :Karaoke ServerPay-Per -View Server

Digital Broadcasting TV Server

ATU-C RACK

Program Downloading Server

LAN

ADSLModem10 BTADSLModemADSLModem10 BT


.

.

.

RouterInternet

.

.

.

AMX (User)AMX (Internet)

AMX (Video Stream)

10 BT*MVideoServer

10 BT*N

CommonController

OC3

OC3

OC3

OC3

VPX

AMX (User)



POTSPOTS

POTSPOTS

POTSPOTS

POTSPOTS

.

.

.

ServiceManager

Network Manager

Video Server :Karaoke ServerPay-Per -View Server

Digital Broadcasting TV Server

ATU-C RACK

Program Downloading Server

LAN


Residential ADSL loops in central Taipei city Phase 1 1996~1998Subscriber number 28T1-based ADSL Down stream is 1.5 Mbps,upstream is 9.6Kbps through RS232 Phase 2 1998~2000Subscribe 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 TVPC based High speed Internet accessADSL downstream is 1.5 Mbps and upstream is 74 Kbps.


Trial Historical informationTrial Historical information ：：


High speed internet accessdownstream 1.5 Mbps upstream 72Kbp

Near-Video-On-Demand (NVOD)Multicast 1.5 Mbps MPEG-1 180 channel(~ 8 movies)

Live TVMulticast 1.5 Mbps MPEG-1 30 channels of cable TV program

Karaoke-On-Demand (KOD)Unicast 1.5 Mbps MPEG-1 stream32 channels


Trial ServiceTrial Service ：：


Core switch(VPX)Setup a QoS connection between customer and video serverATM 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-C16 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 unicastMonitor the system operating statusComponent failure Alert

MOD Major Components


ATU-C LiveTV



AMX and ATM Switch



NVOD



KOD STB



Trail Experiences

Scalable issue of ATMMulticast protocol is proprietary for special purpose Automatic routing for new service is requiredSVC or PVC issue(connection and disconnection respond time)QoS requires PVC connection

Mesh connection is required for each service type to guarantee QoSAlmost all internet service is IP basedATM are layer2 serviceLayer 3 and Layer 2 protocols translation(SAR)for IP service

ADSL bandwidth is limited within certain connection distanceVBR cause packet lostStreaming service must be restricted to CBR


Conclusion

GSR is suitable for IP based multimedia serviceScalable expansion for both subscriber and service Very flexible for new service creationAutomatic Routing rule

Over-engineering to overcome the QoS issueDistribution of service platform to multiple EOs Disperse the traffic load from backbone to local

Content related issues are essentially importantManagement and delivery mechanism(CDN)Conditional access, encryption,decryptionDigital Rights Protection(DRM)Retrieval, Segmentation, Indexing, SortingFormat transformation

chunghwa telecom co. ltd. chunghwa telecom labs

Documents

bt adsl modem adsl modem

adsl lines

adsl users

new service

line service

telephony service

service type

communities internet