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    HCO-1822: HD/SD/ASI Change-Over with Clean Switch Datasheet (GVB-1-0383E-EN-DS) File size: 668.3 KB, posted May 12 2017
    The HCO-1822 from Grass Valley, a Belden Brand, is a 2x1 HD/SD/ASI change-over which supports 16 channels of embedded audio and metadata. Change-overs are performed electronically by the HCO-1822's internal router. The module can perform a video and audio "Clean & Silent Switch" between sources using the CS option. In the event of a power failure, the signal is protected by relays fitted on the rear module, maintaining the integrity of the selected signal at the output. Relays are fully controllable via GPI.