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This standard describes the physical interface and modulation characteristics for a synchronous serial interface to carry MPEG-2 transport bit streams at rates up to 40 Mb/s. It is a point-to-point interface intended for use in a low-noise environment. The low-noise environment is defined as a noise level that would corrupt no more than one MPEG-2 data packet per day at the transport clock rate. When other transmission systems (e.g., studio-to-transmitter microwave links, etc.) are interposed between devices employing this interface, higher noise levels may be encountered. In such cases, it is recommended that appropriate error correcting methods be used (see Figure 1).