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ServSwitch Wizard VGA/USB
724-746-5500 | blackbox.com
Page 28
4. Operation
4.1 General use
In use, the ServSwitch Wizard VGA-USB modules should be transparent - the system and its peripherals should operate exactly as
normal, the only difference being that they are now up to 984 feet (300 meters) apart.
In some installations, you may see some ‘shadows’ to the right of high contrast screen characters. This can be caused by an incor-
rect video compensation setting and it may be necessary to make adjustments to correct this. Please see Video compensation in
the ‘Installation’ section.
4.2 Dual user arbitration
When using two sets of ServSwitch Wizard VGA-USB modules to allow two users to access a single computer, be aware that arbi-
tration between the users is handled by the USB sub-system of the computer. Unlike with other Black Box products, this means
that both users can control the computer at exactly the same time and the resulting keyboard and mouse influences will be an
amalgam of the two inputs - i.e. a mouse move to the right by one user will cancel out a simultaneous left mouse move by the
other. The same is also true when the local module has feed-through peripherals attached to it, adjacent to the computer.
For this reason, the ServSwitch Wizard VGA-USB dual user arrangement is better suited to situations where two users would not
often require simultaneous access.
4.3 Peripheral operation
4.3.1 USB
Each ServSwitch Wizard VGA-USB remote module provides four USB outlets, each of which can support USB 2.0 peripherals at
speeds up to 12Mbps. The ServSwitch Wizard VGA-USB appears to the computer as a four port USB hub.
If the link between the modules is interrupted, any connected USB peripherals will be automatically disabled and re-enabled once
the connection is restored.
[Dual-variant only] Note: When connecting four USB devices to the unit, ensure that their total power requirements do not exceed
1700mA (1.7A). The USB standard states a maximum allowable current draw of 500mA (0.5A) per device, although most devices
remain well below this limit - USB keyboards and mice typically require 100mA. Each ServSwitch Wizard VGA-USB module
contains a self-resetting fuse that will prevent damage by shutting down the unit if the total power draw becomes excessive.