HighSecLabs SC21H-3 User Manual page 28

o When connecting a USB device to the product's fUSB
port that is undetectable for any reason (e.g. failed
device, non-standard device etc.), the fUSB LED will
not illuminate at all and USB device will be
inoperable. In such case the USB device must be
replaced with a qualified device.

Since channel #1 is the default active channel after power up
and in case only some of the channels operate with a USB
device, it is recommended to make sure computer #1 is
connected to USB device.

Once the user switches channels, for example to channel #3,
fUSB functionality will move to computer #3 and be indicated
by channel #3 fUSB LED turning steady green.

In case user switches to a channel that is not connected to a
USB device, the previous USB connection will be terminated
and no new connection will be established.

In case "Freeze fUSB" push button was pressed when fUSB
function was active on computer #1, for example, switching
to a different channel would keep fUSB function locked to
channel #1. To release "Freeze fUSB" function from channel
#1, the user will need to press again the "Freeze fUSB" push
button. The release will be indicated by the channel #1 fUSB
LED being turned off.

Restore-Factory-Default will release "Freeze fUSB" function
from any channel it is locked to.
Using "fUSB Freeze" feature
Press the "fUSB Freeze" push button to lock fUSB function to a
specific channel. The fUSB status LED will indicate that this option has
been activated and to which channel the fUSB function is locked to
at the moment. This means that switching channels would not affect
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the processes performed by the USB device connected to that
channel.
Using "Audio Freeze" feature
Press "Freeze Audio" push button to lock audio to a specific channel.
The LED will indicate this option has been activated and to which
channel the Audio is locked to at the moment. This means that
switching channels would leave Audio active on current channel.
Restore-Factory-Default will release "Freeze Audio" function from
any channel it is locked to.
Keyboard Status Indication
In order to enhance usability, product provides keyboard status
indications via dedicated LEDs located on product front panel. To
maintain the required unidirectional connectivity between keyboard
and product, these indication are not given on the keyboard itself as
done with non-secure products
The keyboard status indications are given via 3 LEDs on the front
panel of the product:
• CL – CAPS Lock
• SL – SCROLL Lock
• NL – NUM Lock
The indications behave the same as the LEDs on the keyboard as if it
was connected directly to computer.
Switching from channel to channel may change the status of the
LEDs based on the current settings on the computer connected to
the active channel.
2/4 Ports Secure KVM Combiner User Manual
Section 5 - Troubleshooting