Instruction manual

UltraLink 2 DVI Installation and Operation Manual 41
Force VNC protocol 3.3:
VNC Protocol 3.3 is a legacy version of the VNC protocol. It is provided to allow connection by non-standard
VNC Viewers. However, it does not offer any encryption and its use is not recommended.
Idle timeout (minutes):
The Idle Timeout field specifies how long in minutes a user can be inactive on a connection before being
logged out. This prevents inactive users from preventing access by other users. When a user’s connection has
been idle for the number of minutes specified in this field, the user is logged off.
Session Sleep Timeout (minutes):
This field specifies how long in minutes the video image on the host computer can remain unchanged before
the VNC Viewer Window goes blank and a message is displayed to the user. The image on the host computer
can remain unchanged if a static image is being viewed and there is no keyboard or mouse activity. When this
timeout value is reached, or when there are no active connections, the UL2-DVI powers down portions of its
video circuitry to reduce power consumption by up to a third.
Protocol timeout (seconds):
This field specifies the length of time in seconds the UL2-DVI will wait for a VNC Viewer to acknowledge
packets. If a packet is not acknowledged in the specified length of time, the unit terminates the connection.
This allows the UL2-DVI to recover from connections that are hung or are terminated abruptly without
disconnecting.
Background Refresh Rate – Slow, Medium, Fast, Auto, Disabled:
Use the arrow keys to alter the refresh rate for screen images at remote links. This allows tailoring the screen
refresh to suit the network connection speed. The Auto setting, which is the default, lets the unit determine the
best refresh rate when multiple users are connected. When the disabled option is selected, remote users will
need to manually refresh the screen.
Note: When a low connection speed is detected, the background refresh is automatically disabled, regardless
of the settings of this option.
Mouse Latency Allowance (milliseconds):
Mouse Latency is used during mouse calibration to deal with latency delays introduced when mouse packets
are passed through KVM switches. If a switch adds a significant delay to the flow of mouse data, the calibration
process can be lengthened or may fail entirely. Positive Mouse Latency Allowance values adjust the mouse
calibration process for the greater latency of slow KVM switches. Negative values down to -40 can be used
with faster KVM switches which have minimal latency. Use this option with caution as it can adversely affect
the calibration process.
Mouse Rate (milliseconds):
This setting is the length of time in milliseconds between each read of the mouse by the UL2-DVI. The default
time period is 20 ms (50 mouse samples per second). This rate may be too fast for some KVM switches,
causing mouse cursors on the host and connecting computer to drift apart. In such cases, increase the mouse
rate to 30 ms or more to decrease the number of mouse samples per second.
Single Mouse Mode Mouse Switch – Disabled, Middle + Right, Middle + Left:
This setting selects the mouse button combination used to exit Single Mouse Mode (when it is active). Single
Mouse Mode is described in in the Operation section, VNC Viewer Window Options.
Use Quick Mouse Calibration:
When checked, this box causes the UL2-DVI to use optimized mouse calibration methods, which are effective
with most mouse types.