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724-746-5500 | blackbox.com
5.0 Troubleshooting
5.1 Monitor Errors
There isn‘t a picture
Check the power supply connection at the local and remote units. Is the Power (red LED) at the local unit illuminated? (See 3.4
Diagnostic LEDs.) If not, the internal power supply may be damaged or there may be an internal error.
Check that the interconnection cable is connected at the local unit and the remote unit. Is the Link Status LED illuminated?
(See 3.4 Diagnostic LEDs.) If not, there may be a problem with the interconnection cable.
Are there errors through data transmission over CATx cable—cable too long, too high attenuation or too much EMI interference?
Is the Data Error LED illuminated or blinking? (See 3.4 Diagnostic LEDs.) If yes, check cable length and environment.
Video OK LED is dark: CPU does not provide a video signal. Check the settings of the graphics card. Connect a monitor to the
local output to see whether there is a signal or not.
“Stepping“ pictures on displaying videos
On high resolutions, the amount of data transmitted each second expires the capability of the data link. Therefore the data
has to be reduced before transmitting. This is done in a first step by an RLE (=Run Length Encoding) algorithm. If this (loss less)
compression does not reach the required amount, frames are dropped: the frame actually transmitted is transmitted
completely even if the graphics card generates a new frame. This new frame is discarded. Because of this behavior, the count
of frames per second (fps) may be reduced to a value, where “stepping“ pictures are se en.
How to solve the problem: Use a lower resolution, which is slightly higher than the resolution of the recorded movie. Mos t
movies only have a resolution of approximately 720 x 480 (NTSC) or 704 x 576 (PAL) or even 320 x 256 (VHS). If the monitor
provides a higher resolution, it may scale these pictures. The picture quality is the same if the monitor or the CPU does the
scaling.
How to solve the problem: Set the color depth to 16-/24-bit AUTOSELECT. On moving pictures, the human eye is not able to
see differences between so many colors. A reduction to 16-bit reduces the amount of data without (visible) effect s.
5.2 USB Keyboard and USB Mouse Errors
Your USB keyboard or mouse does not work
Although we designed the devices to be as transparent as possible, we can’t ensure that all devices will be compatible.
Your mouse is “stepping“ on your screen
On high resolutions, the amount of data transmitted each second exceeds the capability of the data link. Therefore the data rate
must be reduced before transmitting. This is done by using an RLE (Run Length Encoding) algorithm. If this (lossless)
compression is not sufficient, frames are dropped, and as a result, you will see “stepping“ mouse movements.
How to solve the problem: Use a lower resolution or use a desktop background that is better suitable for compression: avoid
photos for background or horizontally graduated colors. Or better yet, use monochrome backgrounds, which allow for higher
compression -> higher frame rates.
ACS4002A-R2