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Moving Picture Expert Group 2 signal switches

The International Standards Organization/International Electrotechnical Commission Moving Picture Expert Group (ISO/IEC MPEG) Signal Switcher Standard calls for the use of serial links to make the interconnection between the pieces of equipment of digital television chains. The management of such high rate links is very delicate. The operators prefer to use parallel links at the rate of 27 Mhz, making the selection of relevant output data inside the transport stream easier. The MPEG2 signal switcher simultaneously allows for commuting and dispatching digital television channels. The switcher permits the selection of a digital television parallel signal among the 2 available on the input and dispatching on 3 to 6 outputs. The parallel inputs and outputs may be either emitter coupled logic (ECL) signals LVDS signals. The whole set is integrated in an aerated rack of standard height with supply and signal presence display lights with a switch for the selected input. As an option the mains can be backed up. Each input-output is independent. The secondary group has an add-on input allowing for cascading all the racks in one single installation. The lack of the MPEG signal is detected by the MPEG stream analysis. It is displayed on the front panel. The commands may be given either manually on the rack itself or remote through a personal computer type microprocessor, cascade-linked to the set of racks with RS 232 links. Commutation is carried out automatically or manually on the main group depending on the MPEG stream. The command of the secondary group is independent from that of the main group which allows for controlling inputs whatever the main group status. The rack may be operated at each intermediate stage of the digital television chain.

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