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Data Broadcasting SolutionsData Broadcasting Solutionsfor Broadcastersfor Broadcasters
by
Brett Jenkins
Thomcast Communications, Inc.
Southwick, MA
SMPTE Technical Conference 2000
Pasadena, CA
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Data Broadcasting Data Broadcasting -- What Is It?What Is It?
CABLE
SATELLITE
Terrestrial
Yesterday
Terrestrial
Today
Internet /Network
CABLE
SATELLITE
Terrestrial
Tomorrow
MultimediaContent
Broadcast Channels
Variety/C
omplexity
MultimediaContent
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MPEG Transport Stream MPEG Transport Stream -- A A Versatile NetworkVersatile Network
n Progressive but rapid evolution of broadcast channels towards MPEG2-Transport Stream
lSatellite (70 %)
lCable (30 %)
lTerrestrial (10 %)
n Various applications:
lVideo/Radio
l Interactive TV
lData Broadcasting
l Internet
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Internet Protocol (IP)Internet Protocol (IP)The Most Common Form of DataThe Most Common Form of Data
IP Header -20 bytes
Includes the source and destinationIP addresses
TCP Header -20 bytes Data
IP Datagram
TCP/IP Data contained within theIP datagram
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Delivering IP over MPEGDelivering IP over MPEG
Application(e.g., FTP, HTTP, SMTP, etc.)
IP
Ethernet(FDDI, Token Ring)
TCP UDP
Application(e.g., FTP, HTTP, SMTP, etc.)
IP
MPEG Transport
TCP UDP
IP-to-MPEG Gateway
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Methods of IP EncapsulationMethods of IP Encapsulation
n Data Delivery Types
lAsynchronous Data
lSynchronous Data
lSynchronized Data
n Encapsulation Methods
lData Piping
lData Streaming
lAddressable Section
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Data PipingData Piping
IP Datagram ≤ 184bytes
MPEG MPEG 0xFF
184 ≤ IP Datagram ≤ 368 bytes
MPEG 0xFF
Stuffing, asneeded
Stuffing, asneeded
4 Bytes 4 Bytes 4 Bytes
or
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Data StreamingData Streaming
IP Datagram ≤ 180bytes
MPEG MPEG
180 ≤ IP Datagram ≤ 364 bytes
MPEG
Adaptation Field
4 Bytes 4 Bytes 4 Bytes
or
PES
Adaptation Field
PES
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Addressable SectionAddressable Section
IP Datagram 1≤ 171 bytes
MPEG MPEG
184 ≤ IP Datagram 2
MPEG
Section 2Section 1
Section 3...
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ArchitecturesArchitecturesn Unicasting
lDistribute content to a single user
lData is private and usually at the request of the user
ue.g., Internet service
n Multicasting
lDistribute content to a “broad audience”
lOnly those who join the multicast group access the content
lConserves bandwidth when content is desired by multiple users
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Data Broadcasting StandardsData Broadcasting Standardsn Advanced Television Systems Committee (ATSC) - Data
Broadcast Standard, Doc. A/90
http://www.atsc.org
n DVB - Specification for data broadcasting EN 301 192
http://www.dvb.org/standards/index.html
n Content Specific Standards
lOpenTV (Proprietary)
http://www.opentv.com
lATVEF - Advanced Television Enhancement Forum
http://www.atvef.com
lATSC DASE (Data Application Software Environment)
Coming Soon
lMultimedia Home Platform (MHP) - DVB TS 101 812
http://www.dvb.org/standards/index.html
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Broadcaster NeedsBroadcaster Needs
n Reliability
lCannot afford to interrupt the main program
n Flexibility
lNo applied business models yet
lNeed to preserve the ability to grow in any and all directions
n Multiple content insertion points
lNeed to have capability for primary and secondary diffusion
lLocal content creation
lLocal content control (editing)
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Unicast Unicast ArchitectureArchitecture
Ethernet
Thomcast Transmitter
Internet
=
BroadcastStudio
TransmitterSite
CustomerPremises
Modem
Customer PC 8VSB Receiver
CustomerISP
Dynamically assignsIP address
STL
Studio ISP
TurquoiseSatellite Receiver
Amethyst
OPENMUXOpalRouter
FractionalT3
VPN Server
TurquoiseCacheTransparen
t Proxy
VPN Tunnel
Amber
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Multicast ArchitectureMulticast Architecture
TurquoiseSatellite Receiver
Transmitter
Amethyst
SMPTE310M DVB-ASI
Turquoise
OPENMUXPearl/Opal
AmberRemux
SMPTE310M
DVB-ASI
DVB-ASI
DVB-ASI
MulticastServer
EthernetHTML Content
Studio
Transmitter SiteCustomerPremises
Receiver
Receiver Card
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Eth
erne
t
Ethernet
MPEG2 SD Encoder 1
MPEG2 SD Encoder 2
MPEG2 HD EncoderMPEG2 Multiplexer
8-VSB Exciter
PSTN
Local OfficeAccess Router
UpStream FeedRouter
UpstreamISP
Access Filter
IP MPEG2 Gateway
EPG Generator
Interactive Datagenerator
Web Server Audio server Interactive Server
Ethernet
Accounting Data Authentification& Access Server
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MPEG and IP CrossroadsMPEG and IP Crossroads
MPEG2HTML / HTTP
Terrestrial /SatelliteLAN
IP
TCP UDP
Ethernet MPEG2-TS
MulticastApplications
UnicastApplications
Web Page Audio Video Content
Web accessover DTVnetwork
Audio/Video Accessover Computer
Network
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MPEGMPEG--2 over IP : Global 2 over IP : Global ArchitectureArchitecture
MPEG2 Over IPGateway
Satellite
Broadband LAN
TerrestrialMPEG2Content
IP IP
Network Routers/Switches
IP
Web PageFilese-mail
High Quality Audio / Video
IP
IP overADSL
Home PCTelevision
Home PCTelevision
Home PCTelevision
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MPEGMPEG--2 over IP : How Does It 2 over IP : How Does It Work?Work?
Gigabit
EthernetMulticast Enabled
Switch
Fast
Ethe
rnet
Multicast Server /Gateway
PAXIP @ 224.0.1.1
FOXIP @ 224.0.1.2
NBCIP @ 224.0.1.3
TF1IP @ 224.0.1.4
ZDFIP @ 224.0.1.5
BBCIP @ 224.0.1.6
RAIIP @ 224.0.1.7
VOD 1IP @ 224.0.1.8
VOD NIP @ 224.0.1.N
PAXIP @ 224.0.1.1
TF1IP @ 224.0.1.4
TF1IP @ 224.0.1.4
VOD 1IP @ 224.0.1.8
Ethernet/IPSet Top Boxes
Leave 224.0.1.1 Multicast group
Join 224.0.1.2 Multicast groupFOX
IP @ 224.0.1.2
Ch
ann
el H
op
pin
g
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Thomcast InitiativesThomcast Initiatives
n Integrating technology partners to provide flexible data broadcasting solutions
lDesire to bring “Best In Class” products together
lWork with open standards
uImprove inter-operability of components
n Working in cooperation with PBS to test data broadcasting systems
lDesire to deliver enhanced television content from central emission point
lWorking with member station WGBY as a test bed
lDesire to branch out to other stations, Oregon Public Broadcasting and WGBH
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What Have We Learned?What Have We Learned?
n MPEG transport provides a reliable mechanism for delivery of IP traffic
n Proposed business models are proliferate but none are yet proven
n Broadcasters need to be flexible in implementing solutions
lNo one can truly predict what services will become the best revenue generators
lBandwidth limitations in the terrestrial chain will limit capabilities to some extent
n Convergence of MPEG and IP provides additional content delivery opportunities
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Contact InformationContact Information
Brett JenkinsBrett Jenkins
Thomcast Communications, Inc.Thomcast Communications, Inc.
Southwick, MASouthwick, MA
Email:Email:bjenkinsbjenkins@@thomcastcomthomcastcom.com.com
