B Color Compression - Black Box ServLink ACR3500A Manual

• If you need to interact with any Power Management Modules attached to the
system while you're in Host Mode, click the Module Processing button to bring
up the Control Module Processing dialog box (see Section 6.1.2).

5.2.6.B Color Compression

Color compression should always be enabled when you're connected to the
ServLINK remotely, because this will dramatically increase remote access speeds by
reducing the amount of screen data that needs to be transmitted by a remote PC.
The Enable box is checked automatically when a remote user connects and it is
cleared automatically when they disconnect.
• Max Pixel Errs/Blk
This adjusts the amount of screen changes that are transmitted over the
remote connection. When this parameter is set to zero, ServLINK repaints any
block of 64 pixels that has even a single pixel change. A setting of 3 indicates
that if 3 or more pixels in the block change, ServLINK should post the block to
the screen; otherwise the block will not be transmitted or redrawn.
The MaxPixel setting should be set to the lowest nonzero value that still
results in an acceptable refresh rate for the remote user.
• Chroma Threshold
Increasing the value of this setting reduces ServLINK's sensitivity to variations
in color. Minor noise or variations in the Host PC's video-output signal can
cause slight variations in color causing pixels to "twinkle" between color
settings. This effect is treated as a change on the screen which may cause
unnecessary screen blocks to be transmitted.
The normal range of settings for the Chroma threshold are 8 to 30 for 256
colors and 20 to 60 for 16 colors.
• Error Limit Blks/Sec
When you're connected remotely, a Host PC's video output may be so far out
of adjustment that the display on your screen is completely unstable. When
this occurs, pcANYWHERE (or whatever remote-access software you're using)
will virtually lock you out while attempting to transmit massive amounts of
screen updates to you. To prevent this from occurring, a threshold may be set
that represents the maximum number of screen-block updates that may occur
per second. If this maximum is exceeded for five continuous seconds,
ServLINK automatically freezes the Host PC's screen to prevent any further
updates from being transmitted, so that corrective action can be taken.
CHAPTER 5: Basic Switching and Host-Mode Options
49