A DVI KVM extender is a device that performs the functions of a KVM extender (keyboard, video, mouse) and can thus transmit DVI signals over longer distances.
Usually, a system with DVI KVM extender consists of a transmitter and a receiver. The DVI signals and the input data are transmitted via a connection interface. For example, Cat-5/6/7 cables or fiber optics are used as common feed lines.
In addition to signal transmission, the DVI KVM extender enables remote control of the connected equipment. A simple DVI KVM extender works with only one monitor, keyboard and mouse needed to control the end device.
In comparison, a matrix-compatible extender makes it possible to switch back and forth between multiple end devices. With the DVI KVM extender capable of handling a KVM matrix, entire systems can be controlled over long distances from different workstations in real time.
Data centers, server rooms, control rooms or other environments benefit tremendously from this technology. Control and monitoring of end devices can also take place in similar application areas.
The DVI (Digital Visual Interface) standard was created in 1999 by the Digital Display Working Group (DDWG), a group of renowned IT companies.
Although it was superseded by HDMI in the entertainment industry in the 2000s, it continues to be used in computers. Even today, it offers its own advantages and disadvantages. Depending on the requirements, they can make its use and that of a DVI KVM extender attractive:
The DVI standard transmits digital signals and enables lossless transmission of images in high quality. The display on the connected screen is clear and detailed if high resolutions and color depths are supported.
Even today, many computers, monitors, projectors and televisions are compatible with DVI connections. DVI-D (digital), DVI-A (analog) and DVI-I (integrated) are some of the different DVI variants. They offer some flexibility in terms of connection.
Unlike other connections such as HDMI or DisplayPort, DVI does not compress the video signal. This can be useful when lossless transmission and accurate color reproduction are required.
However, one of the bigger drawbacks is the lack of audio transmission. Standard DVI connectors cannot support audio transmission. It is necessary to use separate audio cables or alternative connections. Therefore, even a DVI KVM extender needs another channel for audio transmission.
Another disadvantage is that older DVI versions may not fully support higher resolutions or frame rates. Due to earlier standards, they have limited bandwidth. Newer DVI versions such as dual-link DVI or DVI-D with higher bandwidth allow for better performance.
Unlike newer connectors, DVI cannot handle advanced features such as an audio return channel. Ethernet support or integrated networking features are also not possible with a DVI connector. DVI KVM extenders from G&D are therefore equipped with additional connectors. Advanced functions can be transferred through them.
A variety of devices, including computers, laptops, monitors, projectors, and televisions can be connected to DVI. Video recorders, DVD players or game consoles can also be connected with suitable adapters. However, it should be noted that DVI only transmits images and no sound.
DVI is better than HDMI in some cases. For example, when video transmission without audio is desired or when using older equipment that does not have HDMI compatibility. Also, DVI can improve picture quality in some situations. Especially when high resolution or special monitors are used. DVI can be better used in "harsh" environments because the connector is secured by two screws.
There are special DVI variants such as dual-link DVI or DVI-D with higher bandwidth that can transmit 4K resolutions with limited frame rates. The DVI connector was developed in 1999, when there was no 4K image standard. Nevertheless, it can ensure frame rates of up to 30 Hz.
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