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DTVCC Distribution at PBS

This document outlines the DTVCC Closed-Loop Test held at PBS on 3/13/01, focusing on advanced distribution strategies for SDTV and HD content. Utilizing the GE-3 Ku transponder, it discusses the implementation of two transport streams for multicast and looped HD video. Key equipment includes the ProCap Caption Server, Evertz 8075 DTV Caption Encoder, and various Scientific-Atlanta SD Encoders. Proposed methods for optimizing distribution through multiplexing and encapsulation for efficient data transmission, captioning integration, and potential future upgrades in digital video technology are also explored.

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DTVCC Distribution at PBS

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  1. DTVCC Distributionat PBS Gregory Forbes Transmission System Engineer Public Broadcasting Service DTV Caption Summit – 3/14/01

  2. Program Distribution Today • Ku transponder on GE-3 (36MHz) • Two transport streams - SDTV multicast and HD loop • Demux/decode and reencode equipment not necessary

  3. DTVCC CLOSED-LOOP TEST AT PBS 3/13/01 ProCap Caption Server Time Code Evertz 8075 DTV Caption Encoder SMPTE 333, using RS-232 port Digital Vision Bitlink HDTV Encoder Sencore 987 8VSB Modulator ASI RF HD SDI Analog Composite Video (with 608 captions) Sony DTR-HD1 ATSC Decoder SDI Baseband Video with derived 708 captions

  4. PROPOSED HDTV DISTRIBUTION ProCap Caption Server Time Code Evertz 8075 DTV Caption Encoder SMPTE 333, using RS-232 port Digital Vision Bitlink HDTV Encoder 19.39Mbps U/L ON GE-3 HD SDI Analog Composite Video (with 608 captions) SDI

  5. PROPOSED 4-Ch. SDTV DISTRIBUTION DIGITAL VISION ENCODING Evertz 8075 DTV Caption Encoder SMPTE 333, using RS-232 port Digital Vision Bitlink SDTV Config. SDI (259M) 608 Byte stripping SDI (259M) 19.39Mbps U/L ON GE-3 608 Byte stripping SDI (259M) 608 Byte stripping SDI (259M)

  6. PROPOSED SDTV DISTRIBUTION SA POWERVU+ ENCODING Evertz 8075 DTV Caption Encoder Scientific-Atlanta SD Encoder 1 SA PowerVu+ Mux RS-232 (future) SDI Evertz 8075 DTV Caption Encoder Scientific-Atlanta SD Encoder 2 RS-232 (future) SDI 19.39Mbps U/L ON GE-3 Evertz 8075 DTV Caption Encoder Scientific-Atlanta SD Encoder 3 RS-232 (future) SDI Evertz 8075 DTV Caption Encoder Scientific-Atlanta SD Encoder 4 RS-232 (future) SDI

  7. Distribution Tomorrow • Options for two or three transport streams • Multiplex into one 36MHz TP (8PSK for 3 TS) • Encapsulate into 45Mbps DS-3, use 2 or 3 TP’s • Multiplex 2 transport streams into 1 DS-3 • Local encoding, PSIP, switching and bug insertion

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