HighSecLabs SM20N-3 User Manual page 30

fUSB Port (applicable models)
The product is equipped with fUSB port enabling connectivity to
external USB-devices such as smartcard reader.
The filtered USB function (fUSB) enables to control which USB devices
will be operative when connected to product.
For more details on configuration options, please refer to the "fUSB
Configuration Manual".
Summary of rules that apply to fUSB switching:
It is assumed that a "connected channel" is when:
1. Product is powered ON
2. The USB device connected to product console is qualified
and ready for use, as indicated by the fUSB status LED
illuminating steady green.
3. The channel fUSB port on product is connected via USB cable
to a USB port on computer.

When the USB device connected to the fUSB console port is
qualified, the fUSB status LED on the front panel would
illuminate steady green.
o When connecting a USB device that is not qualified
or rejected for security reasons to the product's fUSB
port, the fUSB LED will flash green and USB device
will be inoperable. In such case the USB device must
be replaced with a qualified device.
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.
30
Section 4 - Operation

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
the processes performed by the USB device connected to that
channel.
Using "Audio Freeze" feature
2/4/8 PORT SECURE KM: SM20N-3_SM40N-3_SM40NU-3_SM80N-3_SM80NU-3
SM80NU-3 SM80NU-3 SM80NU-3