Video Display Troubleshooting
The video server supports most major display modes up to 1600 x 1200. Some display problems can occur, however, such as when there is abnormal or unusual display output from your server, when the display resolution is beyond the maximum support level of 1600 x 1200, or when the display vertical frequency is beyond the support range in that pixel dimension. A few of the more common issues are addressed below.
There seem to be many artifacts or residuals not getting refreshed on the viewer screen. Is there any way to improve the video display quality on the viewer screen?
•The video filter may be set at either the Medium or Low quality level. These two levels are for faster response than is provided by the High setting in order to increase the response speed in limited bandwidth conditions. If your bandwidth allows — or if you need higher video quality in lieu of higher speed — just change the video filter from Low to Medium (or even High). To raise the video filter level, go to the Main Settings screen (in the KVM Server submenu) and select the filter as either Medium or High Quality. Note that a High Quality video filter setting provides results at the expense of video response speed on the viewer screen.
•The transition effects in Windows XP are enabled, which will cause refreshing problems in
Low/Medium Video Filter settings. Thus, if you are using a Low/Medium Quality level of the video filter, either try to raise the video filter level to High Quality (at the expense of response speed) or just turn off the transition effects in Windows XP. To turn off the transition effects in Windows XP, see Additional Server Configuration Considerations, P. 11. Also note that the local console is not affected at all by the Video Filter settings or by the transition effects in Windows XP.
The switch’s booting time has become unduly long. What’s wrong?
•Make sure that the external authentication, PPP server/client, time server and power control settings are correct. If you don’t use all these features or the authentication/time servers are not available, just try disabling them to save booting time; otherwise, the switch will try to look for them till timeout.
Video response seems slower under limited bandwidth conditions. Are there ways to increase the response speed?
There are several ways to increase the response speed on the viewer screen:
•Under bandwidth limited conditions, you should select a more economical encoding scheme, such as Slow Internet or Fast Internet Encoding instead of the LAN or No Compression options from the viewer connection menu. However, if the connection is made only within the LAN with plenty of connection bandwidth, LAN or No Compression encoding schemes should be (paradoxically) quicker than the Internet scheme – since your client computer won’t dissipate extra computing power for decoding the more compressed Internet scheme.
•Use
•You can enable Automatic Filter Adjustment (Web Management/Video Server screen) for automatic video optimization based on different bandwidth conditions.
•If you don’t want to use Automatic Filter Adjustment, you could always select either Medium
Quality or Low Quality for more speed as your Video Filter setting. You could also use a server desktop with smaller resolution (such as 800 x 600) and use a solid,
•Also, check the networking environment to see if there is any bottleneck that can be improved or eliminated for more bandwidth throughput.
When a connection is first made, the viewer screen display doesn’t appear to be centered correctly, and there is a black margin on the edge. How can the black strip be removed? The black strip is the offset that’ll be seen when the display on a viewer screen isn’t centered correctly. The switch’s automatic centering option may not be enabled, so check two things:
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