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724-746-5500 | blackbox.com
724-746-5500 | blackbox.com
Page 39
Chapter 5: Troubleshooting
Your mouse is moving like it’s “hanging on a rubber band“
This problem is usually a combination of things, which adds up to a delay between the true mouse movement and the
movement of the mouse pointer on the screen. Delays of up to 100–150 msec can be annoying.
The total delay comes from (time values are approximate values):
• 5 to 15 msec for mouse movement and data transmission to the CPU
• 50 to 70 msec data processing time in the CPU until the refreshed data reach the graphics card output connector
• 15 to 45 msec for transferring the graphics data into the local unit of the extender system and for transmitting to the remote
unit (60 to 20 fps)
• 10 to 100 msec data processing time in the display until the data is displayed on the screen (where 15 msec is normally only
reached by CRT tubes)
Total delay times between 85 to 230 msec are possible. Most of this delay is NOT caused by the extender system. The extender-
based delay is 5 to 15 msec of data transfer to the CPU and 15 to 45 msec of frame transfer to the remote unit—a total of 20 to
60 msec. Even a step from a 100 msec delay to a 140 msec (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 175 msec. So (under special conditions) even
the bare CPU/monitor link can have this problem. If you then add an extender system, the problem may worsen and is falsely
attributed to the extender system, even though the extender is only a small part of 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.) Use a lower resolution or use a
desktop background that is better suited for compression: Avoid photos for background or horizontally graduated colors. It’s
better to use monochrome backgrounds. They allow higher compression -> higher frame rates. If the link has frame dropping, a
reduction from 30 fps to 60 fps saves 17 msec and from 20 fps to 60 fps saves 34 msec.
5.3 USB-HID Device Errors
Your USB-HID device does not work
Although our interface supports HID devices, we can't ensure that every connected device is supported. If you have problems,
contact our FREE Tech Support.
5.4 Other Errors
Your USB- device does not work
You have connected a non-HID device to the HID port. For these ports, only HID devices are supported. (For example, on the
ACS4002A-R2 model, there are six total USB ports at the remote unit. The two ports in the lower row are USB-HID only.
Reconnect your USB device to one of the ports in the upper row.)
ACS4002A-R2