G&D DL-DVI-Vision-IP-Fiber, Installation And Operation Manual

Page: 218 / 232

Further information
G&D DL-DVI-Vision-IP-Fiber · 97
English
Further information
Support of any resolution
In
full screen
mode, the
DL-DVI-Vision-IP-Fiber
system generally supports all resolutions
that can be transmitted through a single link interface according to DVI specifica-
tion 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 103), 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
(
DL-DVI-Vision-IP-Fiber
-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 console 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
( DL-DVI-Vision-IP-Fiber-CPU ) can already access the features of the remote monitor
during booting, the KVM extender contains a cache function. Even when the com-
puter module or the console module are switched off or the devices are not intercon-
nected, 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
DL-DVI-Vision-IP-Fiber system and the digitally con-
nected displays. Due to the non-standardised timing, analogue monitors might
not be able to display the image size and the image position properly.