Altusen ALTUSEN KH2508a User manual

KVM Switch
KH2508A/ KH2516A
User Manual
www.aten.com

KH2508A / KH2516A User Manual
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FCC Information
This is an FCC Class A product. In a domestic environment this product may
cause radio interference in which case the user may be required to take
adequate measures.
This equipment has been tested and found to comply with the limits for a Class
A digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when
the equipment is operated in a commercial environment. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user
will be required to correct the interference at his own expense.
RoHS
This product is RoHS compliant.
SJ/T 11364-2006
The following contains information that relates to China.

KH2508A / KH2516A User Manual
iii
User Information
Online Registration
Be sure to register your product at our online support center:
Telephone Support
For telephone support, call this number:
User Notice
All information, documentation, and specifications contained in this manual
are subject to change without prior notification by the manufacturer. The
manufacturer makes no representations or warranties, either expressed or
implied, with respect to the contents hereof and specifically disclaims any
warranties as to merchantability or fitness for any particular purpose. Any of
the manufacturer's software described in this manual is sold or licensed as is.
Should the programs prove defective following their purchase, the buyer (and
not the manufacturer, its distributor, or its dealer), assumes the entire cost of all
necessary servicing, repair and any incidental or consequential damages
resulting from any defect in the software.
The manufacturer of this system is not responsible for any radio and/or TV
interference caused by unauthorized modifications to this device. It is the
responsibility of the user to correct such interference.
The manufacturer is not responsible for any damage incurred in the operation
of this system if the correct operational voltage setting was not selected prior
to operation. PLEASE VERIFY THAT THE VOLTAGE SETTING IS
CORRECT BEFORE USE.
International http://support.aten.com
North America http://www.aten-usa.com/product_registration
International 886-2-8692-6959
China 86-10-5255-0110
Japan 81-3-5615-5811
Korea 82-2-467-6789
North America 1-888-999-ATEN ext 4988
United Kingdom 44-8-4481-58923

KH2508A / KH2516A User Manual
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Package Contents
The KH2508A/ KH2516Apackage consists of:
1 KH2508Aor KH2516ACat 5 High-Density KVM Switch
1 Firmware Upgrade Cable
1PowerCord
1 Grounding Wire
1 Rack Mount Kit
1 Foot Pad Set (4 pcs.)
1 User Manual*
1 Quick Start Guide
Check to make sure that all of the components are present and in good order.
If anything is missing, or was damaged in shipping, contact your dealer.
Read this manual thoroughly and follow the installation and operation
procedures carefully to prevent any damage to the switch or to any other
devices on the KH2508A/ KH2516Ainstallation.
*Features may have been added to the KH2508A/ KH2516Asince this manual
was printed. Please visit our web site to download the most up-to-date
version of the manual.
Copyright © 2010–2011 ATEN® International Co., Ltd.
Manual Part No. PAPE-0292-AX3G
Manual Date: 2011-01-21
Altusen and the Altusen logo are registered trademarks of ATEN International Co., Ltd. All rights reserved.
All other brand names and trademarks are the registered property of their respective owners.

KH2508A / KH2516A User Manual
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Contents
FCC Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
RoHS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
SJ/T 11364-2006. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
User Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
Online Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
Telephone Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
User Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
Package Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .viii
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Product Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Chapter 1.
Introduction
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Consoles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Computers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
KVM Adapter Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operating Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
KH2508A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
KH2516A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
KH2508A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
KH2516A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Chapter 2.
Hardware Setup
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Before you Begin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Stacking and Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Stacking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Single Station Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Daisy Chaining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Chapter 3.
Basic Operation
Port Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
OSD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Hotkey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

KH2508A / KH2516A User Manual
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Hot Plugging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Hot Plugging Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Hot Plugging KVM Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Hot Plugging Console Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Powering Off and Restarting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Port ID Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Chapter 4.
OSD Operation
OSD Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
OSD Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
OSD Main Screen Headings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
OSD Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
F1: GOTO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
F2: LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
F3: SET. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
F4: ADM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
F5: SKP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
F6: BRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
F7: SCAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
F8: LOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Chapter 5.
Hotkey Operation
Hotkey Port Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Invoking Hotkey Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Number Lock and Minus Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Control and F12 Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Hotkey Mode Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Exiting Hotkey Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Selecting the Active Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Auto Scan Mode Switching. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Setting the Scan Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Invoking Auto Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Exiting Auto Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Skip Mode Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Entering Skip Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Exiting Skip Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Computer Keyboard / Mouse Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Setting the Hotkey Beeper ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Setting the Hotkey key combination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Setting the OSD Hotkey combination . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Setting the Port Operating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Restore the Default Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Hotkey Summary Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

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Chapter 6.
Keyboard Emulation
Mac Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Sun Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Chapter 7.
The Firmware Upgrade Utility
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Performing the Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Starting the Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Upgrade Succeeded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Upgrade Failed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Firmware Upgrade Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Main Board and OSD Firmware Upgrade Recovery . . . . . . . . . . . 56
Adapter Cable Firmware Upgrade Recovery. . . . . . . . . . . . . . . . . 57
Appendix
Safety Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
International. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
North America . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Connection Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
KH2508A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
KH2516A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
OSD Factory Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Administrator Login Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

KH2508A / KH2516A User Manual
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About This Manual
This User Manual is provided to help you get the most from your KH2508A/
KH2516Asystem. It covers all aspects of installation, configuration and
operation. An overview of the information found in the manual is provided
below.
Chapter 1, Introduction, introduces you to the KH2508A/ KH2516A
system. Its purpose, features and benefits are presented, and its front and back
panel components are described.
Chapter 2, Hardware Setup, describes how to set up your installation. The
necessary steps – from a basic single stage hookup to a complete daisy-chained
operation are provided.
Chapter 3, Basic Operation, explains the fundamental concepts involved
in operating the KH2508A/ KH2516A.
Chapter 4, OSD Operation, provides a complete description of the
KH2508A/ KH2516A's OSD (On Screen Display), and how to work with it.
Chapter 5, Hotkey Operation, details all of the concepts and procedures
involved in the keyboard hotkey operation of your KH2508A/ KH2516A
installation.
Chapter 6, Keyboard Emulation, provides tables that list the PC to Mac
and PC to Sun keyboard emulation mappings.
Chapter 7, The Firmware Upgrade Utility, explains how to upgrade the
KH2508A/ KH2516A's firmware with the latest available versions.
An Appendix, provides specifications and other technical information
regarding the KH2508A/ KH2516A.

KH2508A / KH2516A User Manual
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Conventions
This manual uses the following conventions:
Product Information
For information about all ALTUSEN products and how they can help you
connect without limits, visit ALTUSEN on the Web or contact an ALTUSEN
Authorized Reseller. Visit ALTUSEN on the Web for a list of locations and
telephone numbers:
Monospaced Indicates text that you should key in.
[ ] Indicates keys you should press. For example, [Enter]
means to press the Enter key. If keys need to be chorded,
they appear together in the same bracket with a plus sign
between them: [Ctrl+Alt].
1. Numbered lists represent procedures with sequential steps.
♦Bullet lists provide information, but do not involve sequential
steps.
→Indicates selecting the option (on a menu or dialog box, for
example), that comes next. For example, Start →Run means
to open the Start menu, and then select Run.
Indicates critical information.
International http://www.aten.com
North America http://www.aten-usa.com

KH2508A / KH2516A User Manual
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This Page Intentionally Left Blank

1
Chapter 1
Introduction
Overview
A KH2508A/KH2516AKVM switch is a control unit that allows IT
administrators to access and control multiple computers from two PS/2 or USB
KVM (keyboard, monitor, and mouse) consoles. Operators working at up to
two consoles can independently and simultaneously take control of up to 8
(KH2508A), or 16 (KH2516A) computers.
By daisy chaining up to 31 additional switches, as many as 512 computers can
be controlled from the original KVM console. An auto-sensing function
recognizes the position of each station on the chain, eliminating the need to
manually set the position, and a seven-segment front panel LED displays each
Station's position for easy identification.
Compact, high-density, RJ-45 connectors and CAT 5e/6 cable make for a
compact, efficient, wiring configuration, while the use of PS/2 and USB KVM
Adapter Cables to link to the computers, permits any combination of PCs,
Macs, Sun computers, and serial devices to coexist on the installation.
Setting up the KH2508A/ KH2516Ais fast and easy – plugging cables into
their appropriate ports is all that is entailed. Because the KH2508A/ KH2516A
intercepts keyboard and mouse input directly, there is no software to configure
and no complex installation routines.
Access to any computer on the installation is easily accomplished – either by
pressing front panel port selection pushbuttons; entering hotkey combinations
from the keyboard; or by means of a powerful OSD (On Screen Display) menu
system. A convenient Auto Scan function also permits automatic scanning and
one-by-one monitoring of the activities of selected computers.
Your KH2508A/ KH2516Ainvestment is protected through firmware
upgrades. You can download firmware update files from our website, and use
the Firmware Upgrade function to quickly and conveniently install them.
There is no better way to save time and money than with a KH2508A/
KH2516Ainstallation. By allowing one or two consoles to manage up to 512
computers, you: (1) eliminate the expense of purchasing separate keyboards,
monitors, and mice; (2) save space; (3) save on energy costs; and (4) eliminate
the inconvenience and wasted effort involved in constantly having to move
from one computer to another.

KH2508A/ KH2516AUser Manual
2
Features and Benefits
The features and benefits provided by a KH2508A/ KH2516Adeployment are
described in the following table:
Features Benefits
Two Consoles Control Two KVM consoles independently and simultaneously control
up to 8 or 16 directly connected computers.
Scalability By daisy chaining up to 31 additional KH2508A/ KH2516A
switches, as many as 512 computers can be controlled from
the original KVM console.
Easy Installation Setting up the KH2508A/ KH2516Ais fast and easy –
plugging cables into their appropriate ports is all that is
entailed. Because there is no software to configure,
incompatibility and configuration issues are non-existent.
Easy Operation Three port selection methods: Manual (via front panel
pushbuttons), Hotkey, and multi-language OSD (On Screen
Display).
Multi-language keyboard support includes US English, UK
English, French, German, Swiss German, Hungarian, Italian,
Japanese, Korean, Russian, Spanish, Swedish and
Traditional Chinese.
Hardware Independent
Cross-Platform
Support
The KH2508A/ KH2516Asupports Windows 2000/XP/Vista/7,
Linux, Unix, Novell, FreeBSD, Sun, and Mac.
RJ-45 Connectors and
Cat 5e/6 Cabling
This space-saving innovation means that the KH2508A/
KH2516Acan be conveniently installed in a 1U system rack,
and the installation can take advantage of the internal
network wiring built into most modern commercial buildings.
Reduces cable clutter for a neat and tidy data center
environment
KVM Adapter Cables
to Connect to Servers
and Devices
For convenience and flexibility that allows mixing the PS/2,
USB and serial interfaces, the KH2508A/ KH2516A's design
utilizes KVM adapter cables that serve as intermediaries
between the KVM switch and the connected devices.
KVM adapter cables are available in PS/2, USB, and Serial
interfaces to support a wide variety of data center servers
and devices.
Two-Level Password
Security
Supports one administrator and ten user profiles. Strong
password protection prevents unauthorized accessing to the
installation – keeping your valuable data secure.
Upgradeable Firmware Stay current with the latest functionality improvements and
updates by downloading firmware upgrade files from our
website and installing them with the built-in firmware upgrade
utility.
Effortless Upgrades Simultaneous firmware upgrades to all daisy-chained KVM
switches and dongles through the daisy-chain cable.

Chapter 1. Introduction
3
Auto Scanning and
Broadcast Mode
Auto scanning provides hands-free monitoring of selected
devices at variable rates. Broadcast Mode sends commands
from the console to all computers – allowing you to perform
operations (such as software installation, upgrades,
shutdowns, etc.), on them simultaneously
Superior Video Quality Supports the video resolutions up to 1600x1200@60hz for up
to 40 meters, and 1280x1024@75hz for up to 50 meters with
the new ATEN KVM Cable Adapter KA7000 series.
Multiple User Accounts Supports up to 10 user and 1 administrator accounts
Port Operation Modes Diversified port operation modes (Occupy, Exclusive, and
Share) enable flexible computer and access rights
management between the two consoles.
Hot Pluggable Ability to add or remove components without having to power
off the KVM switch.
Adapter Cables with ID The KH2508A/ KH2516AKVM series supports automatic ID
recognition of the new ATEN KVM Cable Adapter KA7000
series (See KVM Adapter Cables on page 5). Using the new
adapter cables with ID means it is not required to change
cable configuration settings when moving cables from port to
port.
Device ID and attributes are stored in the adapter cables
allowing you to hot-swap port connections without having to
reconfigure attributes.
Features Benefits

KH2508A/ KH2516AUser Manual
4
Requirements
Consoles
A VGA, SVGA, or multisync monitor capable of the highest resolution
that you will be using on any computer in the installation
A PS/2 or USB mouse
A PS/2 or USB keyboard
Computers
The following equipment must be installed on the computers that connect to the
KH2508Aor KH2516AKVM ports:
A VGA, SVGA or multisync port
A Type A USB port and USB host controller (for USB KVM adapter cable
connection, see following section)
- or -
6-pin Mini-DIN keyboard and mouse ports (for PS/2 KVM adapter cable
connection, see following section)

Chapter 1. Introduction
5
KVM Adapter Cables
Cat 5e/6 cable is required to connect the KH2508A/ KH2516Ato one of the
KVM adapter cables.
The following KVM adapter cables are required for use with the KH2508A/
KH2516A:
Note: 1. KVM adapter cables are referred to as I/O Modules in some dialog boxes.
2. The following cable models support the Adapter Cable ID function:
KA7920 / KA7970 / KA7520 / KA7570 / KA7120 / KA7170 / KA7130
Operating Systems
Supported operating systems are shown in the table, below:
1Does not support USB.
2Kernels below 2.6 do not support USB 2.0
Function Module
Connect to devices with PS/2 ports KA7920 / KA7520 / KA7120
KA9520 / KA9120
Connect to devices with USB ports KA7970 / KA7570 / KA7170
KA9570 / KA9170
Connect to Sun Legacy systems (with 13W3 port) KA9130 / KA7130
Connect to Sun USB systems KA9170 / KA7170
Connect to serial based devices KA9140
OS Version
Windows NT1, 2000, XP, 2003 Server, 2008 Server, Vista
Linux2RedHat 9.0, Fedora and higher, RHEL AS 4, RHEL 5
SuSE 10 and higher, OpenSUSE 10.2; SLES 10 SP1
Debian 3.1, 4.0
Ubuntu 7.04, 7.10
UNIX IBM AIX4.3, 5L (V5.2,V5.3), V6 (V6.1)
FreeBSD 5.5, 6.1, 6.2
Novell Netware 5.0 and higher
Sun Solaris 8, 9, 10
Mac 9.0, 9.1, 10.1, 10.2, 10.3, 10.4 , 10.5
DOS 6.2 and higher1

KH2508A/ KH2516AUser Manual
6
Components
Front View
KH2508A
KH2516A
543 6
1&2
78
543 6
1&2
78

Chapter 1. Introduction
7
No. Component Description
1 Port Selection
Pushbuttons
Press a pushbutton to give the KVM focus to the computer
attached to its corresponding port.
Simultaneously pressing Pushbuttons 1 and 2 for 3 seconds
performs a keyboard and mouse reset.
Simultaneously pressing Pushbuttons 7 and 8 of the
KH2508Aor Buttons 15 and 16 of the KH2516Astarts Auto
Scan mode (see F7: SCAN, page 36, for auto scan details).
2 Port LEDs The Port LEDs are built into the Port Selection Pushbuttons.
The left ones are the On Line LEDs; the right ones are the
Selected Port LEDs:
An On Line LED lights GREEN to indicate that the computer
attached to its corresponding port is up and running. A
flashing LED indicates that the Port is being used for
cascading to another switch.
A Selected LED lights ORANGE to indicate that the computer
attached to its corresponding port is the one that has the
KVM focus. The LED is steady under normal conditions, but
flashes when its port is accessed under Auto Scan mode
(see F7: SCAN, page 36, for auto scan details)..
3 Reset Switch Pressing this switch in performs a system reset.
Note: The switch is recessed and must be pushed with a small
object, such as the end of a paper clip, or a ballpoint pen.
4 Console
Selection
Pushbuttons
Press a pushbutton to select a console for manual port
selection. When you press one of the manual port selection
pushbuttons the selected console will be connected to that port.
The LED next to the pushbutton indicates which console is
selected.
5 Firmware
Upgrade
Recovery
Switch
During normal operation and while performing a firmware
upgrade, this switch should be in the NORMAL position. If a
firmware upgrade operation does not complete successfully,
this switch is used to perform a firmware upgrade recovery.
See Firmware Upgrade Recovery, page 56 for details.
6 Firmware
Upgrade Port
The Firmware Upgrade Cable that transfers the firmware
upgrade data from the administrator's computer to the KH2508A
/ KH2516A(see page 51), plugs into this RJ-11 connector.
7 Power LED Lights to indicate that the KH2508A/ KH2516Ais powered and
ready to operate.
8 Station ID
LED
The KH2508A/ KH2516A's Station ID is displayed here. If this is
a single station installation (see page 14), or the first station on
a daisy chained installation (see page 17), the KH2508A/
KH2516Ahas a station ID of 01.
On a daisy chained installation, the KH2508A/ KH2516Aauto-
senses its position and displays the station ID that corresponds
to its place in the chain. (see Port ID Numbering, page 21, for
details).

KH2508A/ KH2516AUser Manual
8
Rear View
KH2508A
KH2516A
12
745 6
3
12
745 6
3

Chapter 1. Introduction
9
No. Component Description
1 Power Socket The power cord to the AC source plugs in here.
2 Power Switch This is a standard rocker switch that powers the KH2508A/
KH2516Aon and off.
3 Daisy Chain
Ports
When daisy chaining units (see Daisy Chaining, page 17),
the daisy chain cables plug in here. The port on the left is the
Chain In port; the port on the right is the Chain Out port.
4 Grounding
Terminal
The wire used to ground the unit connects here.
5Console1
Ports
The KH2508A/ KH2516Asupports two independent
consoles. If this is a single station installation, or if this is the
first station of a daisy chained installation, the keyboard,
monitor, and mouse that make up Local Console 1 plug into
section no. 5 and Local Console 2 plugs into section no. 6.
You can use any combination of PS/2 and USB keyboards
and mice for the console.
6Console2
Ports
7 KVM Port
Section
The Cat 5e/6 cables that link to the KVM adapter cables
(which link to the computers) plug in here.

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