EQUITEL - Technical manual D841 / D842
2
September 2010 – Ed.1.0
Chapter 2 Description
2.1. General system description
D841 and D842 system is the EQUITEL solution for the transmission of up to 8 video channels with
the highest possible quality using only one optical fibre.
Figure 1: D841 / D842 system general diagram
In the D841 unit, the video signals are digitized with a 10 bits resolution, without compression, and
are digitally multiplexed for sending over optical fibre.
In the D842 unit the process is the other way around: the optical signal received is demultiplexed
and the analogue video signals are recovered.
The digitizing process and the signal recovery are made without using any compression algorithm.
This allows a latency of just some hundreds of microseconds (the time between the video signal
input and the reception at D842).
This application is usual in big security installations, tunnels systems control and in any situation
where the transmitted video signal requires an excellent quality and no delays.
Both systems are supplied in stand alone version with 12 Vcc power supply.
