DTVCC Distribution at PBS Gregory Forbes Transmission System Engineer Public Broadcasting Service DTV Caption Summit – 3/14/01

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

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

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

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

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

Distribution Tomorrow l 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 l Local encoding, PSIP, switching and bug insertion