Keyboard And Mouse - Belkin F1DN104K-3 Configuration Manual

Secure KM Switch Controls and Modes

Keyboard and Mouse

As with Belkin's Secure KVMs, each of the KM's keyboard and mouse USB ports is isolated from one
another using the same optical data diode technology to eliminate signal leakage. Further, no user data
is buffered in the KM that can potentially create security vulnerabilities. These ports are filtered to
allow only HID keyboard and mouse commands to pass from the keyboard to the KM and physically
block any reverse data flow. The KM eliminates vulnerabilities that exist for data theft or the ability for
signals to leak from one security enclave to another via the USB keyboard or mouse.
Mouse
The KM emulates a USB mouse such that each connected computer believes a keyboard and mouse are
connected directly, even though there is only one physical keyboard and mouse shared among these
systems. The KM mouse function can be configured to work in either Absolute or Relative mode. In
either case, commands are sent to one computer at a time only via the optical data diode isolation
described above and the cursors being emulated on the other computers are hidden from view.
Absolute Mode:
In Absolute mode, the KM maps all monitors onto the same grid, maintaining the coordinates that
reflect the edge of one physical monitor to another. As the cursor is moved from the coordinate at the
edge of one physical monitor and onto the coordinate indicating the edge of its neighbor monitor, the
KM passes data from the physical mouse to the USB emulation logic for the second computer and paints
the cursor onto its corresponding monitor (while simultaneously hiding the cursor on the former
monitor). In doing so, it also invokes the Seamless Cursor Switching (SCS) mechanism to seamlessly
switch the mouse and keyboard controls to the corresponding input source. The KM's mouse
emulators offer zero delay in switching between computers allowing for an instant response. In keeping
with information assurance requirements, the front panel of the KM illuminates the button LED of the
new channel to provide constant visual feedback to operators as to which enclave they are working
with.
P a g e | 2 Secure KM Custom Monitor Configuration Guide LNKPG-00559 Rev. A00