Data Broadcasting Solutions for Broadcasters

Transcription

1 Data Broadcasting Solutions for Broadcasters by Brett Jenkins Thomcast Communications, Inc. Southwick, MA SMPTE Technical Conference 2000 Pasadena, CA page 1

2 Data Broadcasting - What Is It? Multimedia Content Terrestrial CABLE Internet / Network Tomorrow SATELLITE Multimedia Content Terrestrial CABLE Terrestrial Today SATELLITE Broadcast Channels Variety/Complexity Yesterday page 2

3 MPEG Transport Stream - A Versatile Network Progressive but rapid evolution of broadcast channels towards MPEG2-Transport Stream Satellite (70 %) Cable (30 %) Terrestrial (10 %) Various applications: Video/Radio Interactive TV Data Broadcasting Internet page 3

4 Internet Protocol (IP) The Most Common Form of Data IP Datagram TCP/IP Data contained within the IP datagram IP Header - 20 bytes TCP Header - 20 bytes Data Includes the source and destination IP addresses page 4

5 Delivering IP over MPEG Application (e.g., FTP, HTTP, SMTP, etc.) IP-to-MPEG Gateway Application (e.g., FTP, HTTP, SMTP, etc.) TCP UDP TCP UDP IP IP Ethernet (FDDI, Token Ring) MPEG Transport page 5

6 Methods of IP Encapsulation Data Delivery Types Asynchronous Data Synchronous Data Synchronized Data Encapsulation Methods Data Piping Data Streaming Addressable Section page 6

7 Data Piping IP Datagram 184 bytes or 184 IP Datagram 368 bytes MPEG 0xFF MPEG MPEG 0xFF 4 Bytes Stuffing, as 4 Bytes 4 Bytes needed Stuffing, as needed page 7

8 Data Streaming IP Datagram 180 bytes or 180 IP Datagram 364 bytes PES PES MPEG MPEG MPEG 4 Bytes 4 Bytes 4 Bytes Adaptation Field Adaptation Field page 8

9 Addressable Section IP Datagram bytes 184 IP Datagram 2 Section 1 Section 2 MPEG MPEG MPEG Section 3... page 9

10 Unicasting Distribute content to a single user Architectures Data is private and usually at the request of the user e.g., Internet service Multicasting Distribute content to a broad audience Only those who join the multicast group access the content Conserves bandwidth when content is desired by multiple users page 10

11 Data Broadcasting Standards Advanced Television Systems Committee (ATSC) - Data Broadcast Standard, Doc. A/90 DVB - Specification for data broadcasting EN Content Specific Standards OpenTV (Proprietary) ATVEF - Advanced Television Enhancement Forum ATSC DASE (Data Application Software Environment) Coming Soon Multimedia Home Platform (MHP) - DVB TS page 11

12 Broadcaster Needs Reliability Cannot afford to interrupt the main program Flexibility No applied business models yet Need to preserve the ability to grow in any and all directions Multiple content insertion points Need to have capability for primary and secondary diffusion Local content creation Local content control (editing) page 12

13 Unicast Architecture Broadcast Studio Satellite Receiver Turquoise Cache Transparen t Proxy Turquoise VPN Server = Amber Amethyst Ethernet Router OPENMUX Opal STL Fractional T3 VPN Tunnel Studio ISP Internet Customer ISP Dynamically assigns IP address Transmitter Site Modem Customer Premises Customer PC 8VSB Receiver Thomcast Transmitter page 13

14 Multicast Architecture Studio SMPTE310M DVB-ASI DVB-ASI SMPTE310M Satellite Receiver Turquoise DVB-ASI Turquoise HTML Content Ethernet DVB-ASI Amethyst Multicast Server OPENMUX Pearl/Opal Amber Remux Customer Premises Transmitter Site Receiver Receiver Card Transmitter page 14

15 MPEG2 HD Encoder MPEG2 Multiplexer MPEG2 SD Encoder 1 MPEG2 SD Encoder 2 IP MPEG2 Gateway Ethernet EPG Generator 8-VSB Exciter PSTN Interactive Data generator Ethernet Web Server Audio server Interactive Server Access Filter Ethernet Local Office Access Router UpStream Feed Router Upstream ISP Accounting Data Authentification & Access Server page 15

16 MPEG and IP Crossroads Web Page Audio Video Content HTML / HTTP Unicast Applications TCP IP MPEG2 Multicast Applications UDP Ethernet LAN Audio/Video Access over Computer Network MPEG2-TS Terrestrial / Satellite Web access over DTV network page 16

17 MPEG2 Content MPEG-2 2 over IP : Global Architecture Satellite Terrestrial MPEG2 Over IP Gateway IP IP Files Web Page Network Routers/ Switches High Quality Audio / Video IP IP Broadband LAN IP over ADSL Home PC Television Home PC Television Home PC Television page 17

18 MPEG-2 2 over IP : How Does It Work? Multicast Server / Gateway PAX FOX NBC TF Fast Ethernet PAX Leave Multicast group Join Multicast group FOX Channel Hopping Gigabit Ethernet ZDF BBC RAI VOD Multicast Enabled Switch Ethernet/IP Set Top Boxes TF TF VOD VOD N N page 18

19 Thomcast Initiatives Integrating technology partners to provide flexible data broadcasting solutions Desire to bring Best In Class products together Work with open standards Improve inter-operability of components Working in cooperation with PBS to test data broadcasting systems Desire to deliver enhanced television content from central emission point Working with member station WGBY as a test bed Desire to branch out to other stations, Oregon Public Broadcasting and WGBH page 19

20 What Have We Learned? MPEG transport provides a reliable mechanism for delivery of IP traffic Proposed business models are proliferate but none are yet proven Broadcasters need to be flexible in implementing solutions No one can truly predict what services will become the best revenue generators Bandwidth limitations in the terrestrial chain will limit capabilities to some extent Convergence of MPEG and IP provides additional content delivery opportunities page 20

21 Contact Information Brett Jenkins Thomcast Communications, Inc. Southwick, MA thomcastcom.com page 21