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    HCO-3931: 12G/3G/HD Change-over with Clean Switch and Automatic Loudness Control Datasheet (DS-PUB-2-0928B-EN) File size: 380.7 KB, posted Oct 19 2020
    The HCO-3931 from Grass Valley is a 4x1 12G/3G/HD SDI change-over that supports 16 channels of embedded audio and metadata. The module can perform a video and audio "clean and quiet switch" between sources. In the event of a power failure, the PGM signal is protected by a bypass circuit fitted on the rear module, maintaining the integrity of the selected MAIN or BACKUP signals at the output, and it is fully controllable via GPI.