Allows RS232 data to be transported within SDI video signals. The insertion method allows the data to survive subsequent MPEG compression, particularly through MPEG encoders which can handle VBI as video. The user may chose where the data is carried within the SDI.
Two SDI outputs are provided. RS232 data may be input at 9, 600bps or 14, 400bps, and extracted data is output at 19, 200bps. The output data rate must be higher than the input data rate as the SDI link does not provide the usual RS232 handshaking mechanisms.
Each unit may be set by the user to insert or extract data. One unit will be required at each end of the link. By cascading two or more units it is possible to achieve redundancy, or increase the data capacity. The units will not interfere with embedded audio data.
A bypass relay is incorporated to route the SDI input to the main SDI output to ensure signal continuity in the event of power discontinuity, or under user control. The is housed in a robust case designed to be free-standing but up to four BALBOX style units can be mounted in a 1U high tray.
The unit has an integral mains power supply.