During an advertisement break a signal is transmitted from the central TV station. The regional stations decode the signal and relay contacts switch opt-out outputs to control video play-out of local advertising. There are various encodings used to control opt-out switching and each channel may be configured to one of over a dozen different methods.
The ATP950 has two isolated sets of relay contacts and two led indicators for each video channel. A serial port allows the unit to be set up and monitored with a terminal emulator.
Main Features include:
- The unit decodes the following types of opt-out control signal:
Inverted teletext on pages 101, 201, 301 or 401
Eurosport and MTV packet 31
National Geographic page 70A (two types)
MRG Packet 8/30/3 optouts
- Two packet 31 modes (9 and 10)
- Flexible programmable delays can be set
- The unit logs incoming packets for analysis together with a time stamp from the teletext service.
- The user can specify particular CRC values as opt-out control signals.
- Battery backed RAM to store settings.
- 6 x PAL inputs - 1Volt Composite BNC PAL unterminated input with passive loop-through.
- Relay outputs - Twelve GPOs arranged into six channels each with both an OK and an opt-out contact.
- Setup - RS232 serial port for configuration. 9 way male 'D' type connector.
- Baud Rate settings - 3 available – 9600, 19200 and 38400.
- Teletext decoders - 6 Philips MVDAC 16 Mhz devices.
- Processor - Standard PAL 1V pk to pk composite video outputs
- Memory - 256k SRAM.
- Buffer - Serial buffer device converts TTL signal level.
- Power - 230v <15va