The DGX family is comprised of three modular matrix switchers, the Epica DGX 16, 32 and 144 and fully compatible fiber optic transmitters and receivers, the DGX DVI Transmitter and Receiver Modules, and the DGX HD-15 Transmitter and Receiver Modules. The DGX family allows for ultimate flexibility, use the transmitters and receivers as a point-to-point solution sending pure, uncompressed signals up to 3,000 feet; or integrate one of the matrix switchers to allow for up to 6,000 feet (3,000 feet from the transmitter to the matrix switcher then 3,000 feet from the matrix switcher to the receiver).
In addition to the distance and signal clarity fiber can support, fiber-based audio/video signal distribution solutions are inherently more secure which is extremely important in mission critical applications such as command-and-control, and other government and military facilities. Fiber uses light to send data, rather than electric signals, meaning it is perfect for these electronically sensitive environments as it is not susceptible to non-intrusive physical wire tapping.
Single strand multimode fiber is easy to source, install, and terminate making it the preferred transmission medium for many environments.
Designing mid- to large-sized optical-based matrix switching solutions can be challenging due to the large number of varying source and destination resolutions found within the system. In a matrix switching environment, each source can only output a single resolution at time. Incompatibilities in the system can arise when the output resolution of the source is not supported by some or all of the displays in the system. This problem is often overlooked in the design process forcing installers to purchase unplanned and costly external scalers to overcome this issue.
As an alternative solution to solve this problem, some matrix switchers actively evaluate the EDID files within the connected displays and present a combined EDID set. Unfortunately, since this process is really just finding a common resolution between all connected displays, the highest resolution presented to the entire system will be from the lowest resolution display. This is often times referred to as best common or greatest common resolution. Ultimately, in most cases, it means every source device is being forced down to a lower resolution, meaning poorer image quality and an overall inferior video distribution system.
EDID (Extended Display Identification Data) is a data structure established by the Video Electronics Standards Association (VESA ) that allows a display to communicate its capabilities to a source device. During the communication, the display transmits its operational characteristics such as supported video resolution and refresh rates (including preferred or native resolution) to the attached source device. This process eliminates manual configurations through plug-and-play support and maximizes the functional compatibility between devices.
AMX solves this problem using SmartScale Technology on each DGX Receiver, SmartScale automatically responds to the display’s declared EDID information and delivers a custom scaled image based not only on the preferred resolution but also the additional information associated with that resolution such as horizontal and vertical pixel count, detailed timing, color space chromaticity and more. No other manufacturer provides automatic video resolution support at this detailed level. SmartScale eliminates the incompatibilities between sources and displays operating at different resolutions by accepting the highest resolution of every source device ensuring every display operates at its preferred resolution. SmartScale guarantees every picture looks its best with no manual adjustments.
DGX Fiber Transmitters and Receivers are available in two styles –DVI and HD-15– and they are interchangeable. DGX Technology converts between digital and analog video and audio so the pairs can be mixed-and-matched to accommodate situations where the source and the display are a combination of digital and analog. Source device changed from analog to digital? No problem, replace the analog transmitter with a digital transmitter and you’re done. No other system configuration is required.
The DGX Transmitter encodes a single audio, video, and control signal and then transports it over fiber. The Epica DGX matrix switchers distribute the signal to the receivers which converts the signal to either RGBHV or DVI and scales it to the native resolution of the display.
The DGX transport system provides 4.95 Gbps digital switching capability. High speed digital switching enables support for all video resolutions up to 1920x1200 and ensures perfect pixel for pixel reproduction with no reduction in image quality.
The higher the data rate, the higher the resolution it can pass. Within the single link DVI specification, high resolution 1920x1200 signals are comprised of 3 different colors, Red, Green and Blue. Each color requires 1.65 Gbps, thus a minimum of 4.95 Gbps is required to pass the signal. Using equipment with data rates below will lead to video compression, frame dropping and/or an undersampled picture.
Government agencies, universities, hospitals, casinos, retail environments and any facility that demands the highest quality be shared between rooms or even buildings are perfect candidates for a DGX signal distribution system. While the Epica DGX 16, 32 and 144 Matrix Switchers can be used as independent matrix switching platforms; combining products to create a facility wide signal management system offers an almost unlimited video sharing application.
In the diagram above an Epica DGX 32 Matrix Switcher along with DGX Transmitters and Receivers work together to provide signal distribution solutions within each of the four buildings – however there is no need to stop there. Why not share video from building to building? This is easily done by designing the system so that each of the Epica DGX 32 Matrix Switchers include dedicated fiber outputs that feed into another Epica DGX Matrix Switcher (in the case above it's an Epica DGX 144). Creating these dedicated connections between matrix switchers or "trunks" allows that number of signals to be transmitted outside of the building of origin to any of the other 4 buildings.
Regardless of format or signal style the entire system works in harmony. First, with Auto Detect on the DGX HD-15 Transmitter analog source device signal styles (RGBHV, Y/Pb/Pr, RGBS etc.) are automatically recognized; then these analog signals along with any DVI signals sent from the DGX DVI Transmitters are transmitted through any DGX Matrix Switcher using DGX Technology which provides a common platform; and last the DGX Receivers (both HD-15 and DVI) transcode the signal style to that of the display connection being used and scale with SmartScale to deliver perfect video to any display.
The recommended distance for each fiber point is 3,000 feet; however each of the DGX products re-clock the signal so that it is ready to be sent another 3,000 feet. In the example used above the longest run between source and device can be 12,000 feet – that's 2.27 miles