www.amulethotkey.com | 4
1. Introduction
The K4u
+
is a four channel keyboard, mouse and stereo audio
switch. It enables up to four computers to be controlled from a
single keyboard and mouse. The stereo audio outputs of the
four hosted computers can also be switched or mixed through
to a single set of speakers.
Any combination of USB, legacy Sun™ or PS/2 compatible
computers can be connected and controlled from a USB or PS/2
compatible keyboard and a USB mouse.
In addition, the K4u
+
has a ‘hot-plug’ port for connecting
un-hosted USB devices. You can also connect a K4u
+
to other
K4u
+
switches to increase the number of channels available or
allow channel sharing. These features are described later in this
manual.
The K4u
+
is configured by two banks of DIP switches on the
underside of the case. For more information on DIP switches,
see section 3.
1. 1 Terminology
This manual uses ‘KVM switch’ as a generic term when referring
to keyboard and mouse switches, regardless of whether they
support video and audio switching.
This manual often refers to keyboard and mouse focus. When
several computers are attached to the channels on a K4u
+
switch, the focus identifies the computer currently being used
by a user. Similarly, the terms active channel or selected channel
also refers to the currently selected computer.
1. 2 KVM switches must be secure
The Amulet Hotkey K4u
+
switch is designed for use in mission-
and business-critical environments such as trading floors,
command and control centres, and government. Security is
essential in these environments, especially when a KVM switch
is used with sensitive or secure workstations. In particular:
■ It must not be possible for a password destined for one
hosted computer to be sent through the KVM switch to
another hosted computer.
■ It must not be possible for data to be exchanged from
hosted computers using the KVM switch as a conduit.
■ The switch must not log sensitive data such as passwords for
later unauthorised use.
■ A switch must not stop working if someone inadvertently
pulls out the power.
■ Key codes passing through a KVM switch must not be
corrupted or misread; the firmware must be completely
accurate and error free.
The Amulet Hotkey K4u
+
is designed to meet and exceed these
requirements.
1. 3 TEMPEST versions of the K4u
+
TEMPEST level B versions of the K4u
+
are available by special
arrangement. These K4u
+
versions are TEMPEST modified and
tested by our partner, OSPL Nederland B.V., who operate and
maintain a NATO- and NSA-certified TEMPEST test and
production facility.
K4u
+
KVM Switch
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