Further information
G&D DVI-Vision-IP ·
58
English
Further information
Support of any resolution
In
full screen
mode, the
DVI-Vision-IP
system generally supports all resolutions that can
be transmitted through a single link interface according to DVI specification 1.0.
This restriction mainly affects the pixel rate, which can be between 25 MHz and
165 MHz.
Therefore, resolutions between 640 × 480 pixels at 60 Hz and 1600 × 1200 pixels at
60 Hz are possible for the common timing standards by VESA DMT and VESA
SMT. 1920 × 1200 pixels at 60 Hz is transmitted according to VESA CVT-RB.
As stated in the technical data (see page 64), almost any refresh rate and resolution
are supported within the technical constraints. The available display modes are
largely dependent on the graphics card, the graphics driver, the operating system
and the connected monitor.
The video data that are transmitted from the computer to the computer module
(
DVI-Vision-IP
-CPU) are transferred to the monitor of the remote console with the
same timing. The signal’s frequency and display position at the computer module
therefore correspond to those of the graphics output.
DDC transmission with cache function
The KVM extender supports
Enhanced-DDC
(Enhanced Display Data Channel) to read
out the data from the monitor that is connected to the user module and transmit
them to the computer. This data includes information regarding the preferred reso-
lution and the supported monitor frequencies.
To make sure that the computer connected to the computer module
(
DVI-Vision-IP-CPU
) can already access the features of the remote monitor during
booting, the KVM extender contains a cache function. Even when the computer
module or the user module are switched off or the devices are not interconnected,
the properties of the most recently connected monitor or a default data block are
provided in the KVM extender.
The monitor’s DDC information is usually transmitted one-to-one to the computer.
Should the KVM extender determine that the display cannot be read without errors
or that the entries are invalid, the information is completed or corrected (if possible).
NOTE:
While generating the video signal, some graphics cards differentiate
between digital and analogue output. Such graphics cards generate digitally out-
put image signals with partly non-standardised timings. Such timings do not com-
ply with the monitor’s default to reduce the frequencies of the digital signals.
Usually, this does not affect the
DVI-Vision-IP
system and the digitally connected
displays. Due to the non-standardised timing, analogue monitors might not be
able to display the image size and the image position properly.
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