Video/WCLK Sync Input board for the NEXUS

  • Video and word clock inputs
  • Automatic detection of video formats
  • Input filter for restoring analogue video signals
  • Video-sync input (BNC) for bi-level and tri-level sync signal
  • Word clock out

 Data sheet (145 KB)

The XSYNC board for the NEXUS was designed for connecting to ex­ter­nal studio systems and devices. It provides two inputs used for syn­chro­nising the NEXUS system remotely: video and word clock. The syn­chro­nising input is selected using the NEXUS control program.

Sync Inputs

Video External video signals are input via a standard BNC port. It is iso­lated galvanically and unbalanced (as specified by the format). The video input handles a number of formats: It accepts not only com­pos­ite and component video but also the new HD formats, including bi-le­vel and tri-level syncs, as the sync source. The XSYNC automatically detects the input format, so manual selection is unnecessary. It in­cor­po­rates a composite filter enabled selectively for suppressing analogue in­ter­fer­ence (noise, voltage peaks).
Wordclock External word clock signals are input via a standard BNC port. It is isolated galvanically and balanced. The port accepts TTL sig­nals. The nominal input impedance of 75 ohm can be changed to approx. 500 ohm. This allows for connection of multiple destinations to a single source.

Sync Outputs

The NEXUS system clock (referenced externally or generated internally) is made available to external units at the galvanically isolated TTL word clock output.


The XSYNC board requires a Matrix 4 generation or later NEXUS system.  It is therefore compatible with XCPU06 controller boards or later.

Indication and Error Detection

The XSYNC detects and indicates sync-signal failure.

Hot Swap

As is usual with NEXUS components, the XSYNC board can be removed and replaced during operation. If necessary, the NEXUS switches to the next available internal or external sync source automatically.

XSYNC Specifications

Video Input Port BNC
Design Galvanic isolation
Sensitivity 1 V nom. (0.5 to 2 VPP)
Impedance 75 ohm
Required stability < ±100 ppm (typ. ±50 ppm, compliant with AES 11, Grade 2)
SD formats (NTSC, PAL) - 525 lines interlaced, 59.94/60 Hz (NTSC)
- 525 lines progressive, 59.94/60 Hz
- 625 lines interlaced, 50 Hz (PAL)
- 625 lines progressive, 50 Hz (PAL)
HD formats (SMPTE 296M) 720 lines progressive, 50; 59.94 und 60 Hz
HD formats (SMPTE 274M, SMPTE 260M) - 1035 lines interlaced, 59.94/60 Hz
- 1080 lines interlaced, 50; 59.94 und 60 Hz
- 1080 lines progressive, 23.98; 24; 25; 29.97; 30; 50; 59.94, and 60 Hz
Word clock in
Port BNC
Design Balanced, galvanic isolation
Sensitivity TTL, 1 to 5 V
Impedance 75/500 ohm (jumper-configurable)
Frequency 44.1, 48, 88.2, 96 KHz
Required stability < ±150 ppm (typ. ±50 ppm, compliant with AES 11, Grade 2)
Word clock out Port  BNC
Design Balanced, galvanic isolation
AC/DC coupling Jumper-configurable
Level  ≥2.4 Vpp on RL = 75 ohm
Impedance 75 ohm
Frequency 44.1, 48, 88.2, 96 KHz
NEXUS frequency stability min. ±10 ppm, typ. ±5 ppm (when using internal generator)

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