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The 500ACO2-HD/SD dual HD/SD Autochangeover is designed to provide extension to the 5600ACO for HD or SD SDI, DVB-ASI, AES audio, bi-level/tri-level syncs and NTSC/PAL video. The unit can also be operated as a standalone changeover unit with two independent 2X1 switchers. The 500ACO uses latching relays to ensure maximum reliability and minimal disruption in the event of any failure.

The 500ACO2-HD/SD is housed in the 500FR Exponent Frame that will hold up to 16 modules.


  • Auto detection of six signal types
  • Five modes of operation (including VistaLINK®)
  • Auto changeover - two standalone auto changeovers or two link changeovers
  • Manual DIP switch control - two independently controlled 2x1 switchers
  • GPI Control - two independently GPI controlled 2x1 switchers
  • ACO Extension - slave unit of the 5600ACO (requires 5600ACO firmware version 1.2 or higher)
  • Support for VistaLINK® monitoring and control
  • Fully hot-swappable from front of frame with no BNC disconnect required
  • Tally output on Frame Status bus upon loss of input signal for quality monitoring
  • Latching relays maintain the current path on loss of power
  • VistaLINK® capable for remote monitoring via SNMP (using VistaLINK® PRO) when installed in 500FR frame with 500FC VistaLINK® Frame Controller


Serial Video Input

Standards SMPTE ST 292-1, SMPTE ST 259-A, B, C, D (143 to 540Mb/s), DVB-ASI, bi-level/tri-level syncs or NTSC/PAL video
Number of Inputs 4
Connector BNC per IEC 61169-8 Annex A
Maximum Cable Length 100m of Belden 1694A or equivalent cable combined input and output
Return Loss 10dB up to 1.5Gb/s

Serial Video Output

Number of Outputs 2 passive relay outputs
Connector BNC per IEC 61169-8 Annex A
Maximum Cable Length 100m of Belden 1694A or equivalent cable combined input and output
DC Offset 0V ±0.5V
Return Loss 10dB up to 1.5Gb/s

General Purpose Input and Output

Inputs Opto-isolated input with internal pull-up to +5V.
Outputs Normally 10k internal pull-up to +5V. Ground to rear panel when relay is in active position.
Connector Two 3 pin terminal blocks with one ground each.
Signal Level +5V nominal


Number of Slots 1


Voltage +12V DC
Power 6 Watts
EMI/RFI Complies with FCC Part 15 Class A, EU EMC Directive

Ordering Information

500ACO2‑HD/SD Dual HD/SD-SDI Digital Auto 2x1 Signal Changeover


500FR 3RU Exponent Compact High Density Distribution Frame
S501FR 500 Series Standalone Enclosure


500FC VistaLINK® Frame Controller
CP-2116E-H Remote Control Panel
CP-2232E Remote Control Panel