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    HCO-3901 & HCO-3901-4K: 3G/HD/SD/ASI and 4K UHD Change-Over with Clean Switch and ALC Datasheet (GVB-1-0384I-EN-DS) File size: 1.0 MB, posted Aug 31 2017
    The HCO-3901 from Grass Valley, a Belden Brand, is a 3x1 3G/HD/SD/ASI change-over which support 16 channels of embedded audio and metadata. The module can perform a video and audio "Clean and Silent Switch" between sources using the CS option (not available with ASI signals). In the event of a power failure, the PGM 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. With the addition of the HCO-3901-3DRP-R-EX rear panel, the HCO-3901 now supports paired outputs for 3G/HD/SD SDI (single outputs only for ASI).

    The latest addition, HCO-3901-4K, supports 4K UHD Quad-Link SDI change-over with support for embedded audio and metadata. The additional HCO-3901-X4RP remote control connector supports glitch-free switching of four synchronized 3G-SDI signals or Quad Link 3G-SDI signals.