TROUBLESHOOTING
37
or horizontally graduated colors – better use monochrome backgrounds. They allow
higher compression -> higher frame rates.
Your mouse is moving like ‘hanging on a rubber band’
This problem derives from different single problems, which accumulate to a delay
between the true mouse movement and displaying the movement of the mouse
pointer on the screen. Depending to our measurements, a delay of approx. 100-
150msec are recognized as disturbing.
The total delay comes from (time values are approx. values):
•
5 to 15msec for mouse movement and data transmission to CPU
•
50 to 70msec data processing time in the CPU until the changed data
reach the graphic card output connector
•
15 to 45mcec getting the graphic data into the local unit of the
extender system and transmitting to the remote unit (60 to 20fps)
•
10 to 100msec data processing time in the display until the data are
displayed on the screen (where 15msec normally are only reacht by
CRT tubes)
In total there are delay times between 85 and up to 230msec possible, where most
of this delay is NOT caused by the extender system (Extender based delay is 5 to
15msec data transfer to the CPU and 15 to 45msec frame transfer to the remote unit
– in total 20 to 60mesec. Depending to our experiences, even a step from 100msec
delay to 140msec (i.e. by inserting an extender system to a CPU-monitor link) may
cause visible effects.
Please note, that even a monitor directly connected to a CPU has a delay of 70 to
175msec. So (under special conditions) even the bare CPU/monitor link shows this
‘rubber band behaviour’. If you now insert an extender system, the problem may
occur and is (in false) dedicated to the extender system, where it only gives a small
part to the total problem
How to solve the problem: Use a display with a low delay time (NOTE: This is
NOT the reaction time indicated by the manufacturer. This reaction time is only the
time the display needs, to switch a black pixel to get white or vice versa, but not
how long it takes from receiving the data on the connector until they are displayed
on the screen.) Please use a lower resolution or use a desktop background which is
better suitable for compression: Avoid photos for background or horizontally
graduated colors – better use monochrome backgrounds. They allow higher
compression -> higher frame rates. If – and only if the link has frame dropping, a
reduction from 30fps to 60fps saves 17msec and from 20fps to 60fps saves 34msec.
USB-HID device
Your USB-HID device does not work
Although our interface supports HID devices, we can’t ensure that every connected
device is running. In case of a malfunction please contact our technical support.
Summary of Contents for ACS2009A-R2
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