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DCO-1781 4 AES Changeover with Silent Switch Option

The DCO-1781 is a 4 AES change-over. The switch is performed electronically by an internal router. In the event of a power failure, the signal is protected by the relays fitted on the rear module, maintaining the integrity of the selected signal at the output. The DCO card allows switching as a regular router, or alternatively the module can perform an audio silent switch between sources using the silent switch software option. Input selection can be performed manually or automatically.


  • Up to 4 AES on each input
  • Electronic switching with relay backup (on rear module)
  • Automatic mode using internal signal analysis with alarm parameters
  • Manual change-over by local frame controller, iControl, iControl Solo or GPI
  • GPI outputs give status of selected source for tallies
  • Alarm reporting to iControl facility monitoring and control system
  • Optional silent switch function
  • Frame reference input
  • Audio level meter streaming
  • Emergency audio tone


Audio Inputs (4 AES per input)
  • Sampling freq.: 48 kHz ±100 ppm
  • Quantization: 16 to 24 BITS
  • All A inputs must be synchronized with each other.
  • All B inputs must be synchronized with each other.
  • AES3
    • Level: 0.2 to 7 Vp-p
    • Impedance:
      • Transformer balanced
      • 110Ω (bypass off)
      • >5 kΩ (bypass on)
  • AES3-id
    • Level: 0.2 to 2 Vp-p
    • Impedance:
      • 75Ω (bypass off)
      • >5 kΩ (bypass on)
  • Return loss: >15 dB up to 12 MHz


Audio Output (4 AES)
  • Sampling freq.: 48 kHz ±100 ppm
  • AES3
    • Level: 4 Vp-p
    • Impedance: 110Ω balanced
  • AES3-id
    • Level: 1 Vp-p
    • Impedance: 75Ω
    • Return loss: >15 dB up to 12 MHz
Reference Input
  • Signal: URS for Densité
Processing Performance
  • Quantization: 24 bits
  • Sampling: 48 kHz, synchronous
  • Number of channels: 8
  • Latency:
    • 3 audio samples
    • 40 ns (direct mode)
Alarm Parameters
  • AES audio alarm
    • AES carrier
    • No Lock
    • Parity
    • CRCC
    • Validity
    • Not 48 kHz
  • Audio type
    • PCM
    • Dolby-E
    • Dolby Digital AC 3
    • Non PCM
  • Overload
    • Level
    • Max
    • Min
    • Silence
    • Overload
  • Dynamic
    • Low dynamics
    • AES imbalance
    • AES phase
    • AES stereo width
  • Metadata
    • Program config
    • Dialnorm
  • Tone generator: 1 kHz sine wave interrupted on left channels (250 ms / 3s) EBU R49
  • Emergency audio clip: storage provided for one or two files, with a total duration from 11.3s (for stereo signal sampled at 48 kHz) to 45s (for mono signal sampled at 24 kHz)
  • Power: 10W


Densité 2 frame Densité 3 frame Description
DCO-1781 DCO-1781-3RU 4 AES audio change-over with optional silent switch
DCO-17N1-75-DRP-R DCO-17N1-75-DRP-R-3RU Double rear connector panel, unbalanced audio w/relay
DCO-17N1-110-DRP-R DCO-17N1-110-DRP-R-3RU Double rear connector panel, balanced audio w/relay
Options Description
DCO-17NN-OPT-SS Silent switch option for DCO-1781
BOC-DA26-8BNC-1 75 ohm digital audio breakout cable
Related products FRS-1103, ENC-1103, DEC-1003, DEC-1023, XVP-1801 (all), ADC-1101, XVP-3901
Remote control iControl, iControl Solo, RCP-200



DCO-1781: 4 AES Audio Change-over with Silent Switch Option Datasheet

The DCO-1781 from Grass Valley, a Belden Brand, is a 4 AES change-over. The switch is performed electronically by an internal router.



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