Video

If a video input or output does not appear to be working, several things may need to be checked. First use DisplayNet Manager to navigate to the device settings for the endpoints involved, and check the HDMI connection status on both the transmitter and receiver. If DisplayNet Manager shows no connection, then check the physical HDMI cable connection.

Next, check the settings on the display (e.g. monitor or projector) to ensure the correct input source is selected. If the problem is on the source side, ensure that the source video feed is active. If the problem persists, try unplugging the TX or RX in question from one network switch port and plugging it into another. If that resolves the issue, there may be issues with certain ports on the 10GbE switch, contact the switch manufacturer for further assistance. If this does not resolve the issue, it could be that the Stop Video function is activated on the TX, or it could be that the Leave function has been performed on the RX; ensure that these are disabled in DisplayNet Manager, respectively. Additionally, ensure that any EDIDs assigned to transmitters are compatible with the displays attached to the receivers. Further details are available in the EDID management section.

If the issue remains unresolved, there could be an underlying compatibility issue between the source and the display. Bypass the DisplayNet system by using a short, high-quality cable to connect the source device directly to a known working reference display. Check the display by connecting it to a known working reference source device. In both scenarios, verify that the correct image and sound are present. Next, connect the affected source directly to the affected display. If the problem is present under these conditions, then there is a compatibility issue between the source and the display that must be resolved independently of DisplayNet.

If the system cannot achieve certain higher resolutions, such as 3840x2160, please ensure that the proper EDID is being used. The default EDID loaded into the DisplayNet devices has a preferred timing of 1920x1080 /60p (with 2-channel LPCM audio).

If seamless switching does not appear to be working, ensure that all prerequisites for seamless switching are met. First, seamless switching is only possible when a DisplayNet receiver is set to Fast Switched Mode; it is not available in Genlocked Mode. Next, check that the source signals being switched have the same resolution, refresh rate, color depth, and color space. When switching between source signals with different characteristics, the display must re-synchronize. This prevents the switchover from being seamless as resynchronization time is display dependent. The EDID management capabilities in DisplayNet can help ensure that different source devices default to the same output format.

If the displays are out of sync with each other, ensure that all the receivers connected to the displays are set to Genlocked Mode. In this mode, the outputs from the receivers are genlocked to the source input signal from the transmitter. Fast Switched Mode does not guarantee synchronization between displays, due to the variable latency introduced by the frame buffer in each receiver. Finally, ensure that the same model of display is being used. Different brands and models of displays may have different amounts of input lag.

If there is visible noise in the picture, then there may be an oversubscription issue. In this case, the DisplayNet receiver may be accepting signals from multiple transmitters and the resulting traffic overload is causing image distortion. Ensure that the 10GbE network switch supports the required features for DisplayNet and that all the correct settings are configured in the switch. When properly configured, there should not be any oversubscription issues. If the noise is still present, try connecting the affected TX or RX device to another port on the network switch. If the noise persists, please contact DVIGear technical support.