Kingston Technology KNE12TX/RS User manual

KINGSTON TECHNOLOGY
FAST ETHERXSTACKABLE
8-PORT, 12-PORT, & 24-PORT
100BASE-TX 19” RACK-MOUNTABLE
FAST ETHERNET HUBS
USER’S GUIDE
MODELS: KNE8TX/RS
KNE12TX/RS
KNE24TX/RS

KNE24TX/RS User’s Guide - Rev. A01 Kingston Technology Company
Kingston Technology’s
Fast EtheRx Stackable
8-Port, 12-Port, and 24-Port
100BASE-TX 19” Rack-Mountable
Fast Ethernet Hubs
User’s Guide
Part No. 4460051-001.A01
Kingston Technology Company
17600 Newhope
Fountain Valley, CA 92708
[phone]
Important Safety Instructions

Kingston Technology Company KNE24TX/RS User’s Guide - Rev.
A01
1. Read all these instructions.
2. Save these instructions for later use.
3. Follow all warnings and instructions marked on the product.
4. Do not use this product near water.
5. This product should be operated from the type of power
source indicated on the marking label. If you are not sure of
the type of power available, consult your dealer or local
power company.
6. Do not attempt to service this product yourself, as opening
or removing covers may expose you to dangerous voltage
points or other risk. Refer all servicing to service personnel.
Wichtige Sicherheitshinweise
1. Diese Hinweise sollten vollständig durchgelesen werden.
2. Diese Hinweise für einen späteren Gebrauch aufbewahren.
3. Allen auf dem Gerät angebrachten Warnungen und
Hinweisen folgen.
4. Das Gerät nicht in der Nähe von Wasser verwenden.
5. Das Gerät nur mit dem Aufkleber bezeichneten
Netzspannung betreiben. Bei Fragen über die Art der
Netzspannung sollte der Händler oder das
Energieversorgungsunternehmen zu rate gezogen werden.
6. Nicht versuchen das Produkt selbst zu reparieren. In allen
Produkten existieren gefährliche elektrische
Spannugen. Nicht das Gehäuse öffnen.

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KNE24TX/RS User’s Guide - Rev. A01 Kingston Technology Company
TABLE OF CONTENTS
Introduction ............................................................................ 2
Order Information ..................................................... 2
Model Types ............................................................. 3
Special Features....................................................... 4
Package Contents .................................................... 4
Design Features .................................................................... 5
Repeater Functions .................................................. 5
Jabber Lock-up Protection ....................................... 5
Collision-Handling..................................................... 5
Error-Handling .......................................................... 5
Automatic Partitioning/Reconnection ....................... 6
Hardware Installation............................................................. 6
Front Panel ............................................................... 6
Power LED .................................................. 6
Collision LED ............................................... 6
Fiber Module Detection LED ....................... 6
UTP Port LEDs ............................................ 7
Utilization LEDs ........................................... 7
UTP and Uplink Ports .................................. 7
Using a Crossover Cable ............................ 8
Notes on MDI and MDI-X Ports................... 8
Rear Panel................................................................ 9

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Kingston Technology Company KNE24TX/RS User’s Guide - Rev. A01
Power Switch .............................................. 9
AC Power Connector .................................. 9
Fan Units..................................................... 9
100FX Fiber Module (Optional)................... 9
Stacking Fast EtheRx Hubs ...................... 10
Installing the 100FX Module (Optional) .... 11
Appendices ......................................................................... 12
Appendix A Pin Assignments.............................. 13
UTP Port Pin Assignments ....................... 13
Appendix B Cabling Guidelines .......................... 14
Cable Wiring Standards ............................ 15
UTP Cable Rating Codes.......................... 16
Appendix C Specifications .................................. 18
Appendix D Commonly Asked Questions........... 21
Appendix E Mounting Templates ........................ 23
Rubber Feet for Desktops......................... 23
Brackets for Rack Mounting...................... 23
Appendix F Product Warranties and Notices...... 24
Limited Warranty Statement ..................... 24
Duration of Warranty................................. 24
Free Technical Support............................. 25
Disclaimers................................................ 25
Certifications ............................................. 26
Introduction

2 Introduction
Kingston Technology Company KNE24TX/RS User’s Guide - Rev. A01
Intended Audience: This manual assumes that the user has a general working
knowledge of networking principles and its architecture.
Congratulations on the purchase of your Kingston Fast EtheRx Stackable
100BASE-TX 19” Rack-Mountable Fast Ethernet Hub. There are three models
available: KNE8TX/RS, KNE12TX/RS, and KNE24TX/RS, 8-Port, 12-Port,
and 24-Port Fast Ethernet hubs, respectively. The Fast EtheRx models are
100BASE-TX Class
I
and Class II compliant repeaters which conform to
IEEE 802.3u 100Mb/s CSMA/CD (Carrier Sense Multiple Access with
Collision Detection) networks using Category 5 Unshielded Twisted Pair
(UTP) cabling. There is also an optional 100BASE-FX plug-in module
available for either SC or ST-type connectors. The Fast EtheRx 100BASE-TX
hubs operate at 100Megabits per second (Mbp/s) out-performing standard
10BASE-T Ethernet 10Mb/s operation by up to 10 times faster.
The Fast EtheRx hubs offer eight (8), twelve (12), or twenty-four (24) UTP
ports for 100BASE-TX Fast Ethernet connections. The last UTP port offers
two RJ-45 connectors to support both crossover or straight-through cable wiring
for uplinking to one other 100BASE-TX Class
II
repeater. The Fast EtheRx
hubs can also be stacked (using any combination of these 3 models) up to six
hubs using the stacking cable provided. This allows a maximum of 48, 72, or
144 UTP ports (depending on the model) on a single collision domain. The
Fast EtheRx hubs can be used on desktop or 19-inch rack-mount installations
(mounting hardware included). For easy trouble-shooting, the front panel
includes a variety of diagnostic LEDs including: Power, Collision, Utilization
and UTP port LEDs which display Link, Activity and Partition/Error status.
For the remainder of this manual, the Fast EtheRx Stackable Fast Ethernet
Hubs will be referred to collectively as the Fast EtheRx Hubs. For clarity, the
three models will be differentiated as follows:
 KNE8TX/RS – Fast EtheRx Stackable 8-Port Fast Ethernet hub
 KNE12TX/RS – Fast EtheRx Stackable 12-Port Fast Ethernet hub
 KNE24TX/RS – Fast EtheRx Stackable 24-Port Fast Ethernet hub
Order Information

Introduction 3
KNE24TX/RS User’s Guide - Rev. A01 Kingston Technology Company
The Fast EtheRx hubs support optional Fiber Optic plug-in modules which can
be ordered for future upgrading by the following part numbers:
Accessories
Part No. Description
KNE100FX/RSC Optional 100BASE-FX Fiber Optic Plug-In Module
with SC (Subscriber Connect) connectors
KNE100FX/RST Optional 100BASE-FX Fiber Optic Plug-In Module
with ST (Straight Tip) connectors
Model Types
100BaseTX Fast Ethernet Stackable Hub
KNE8TX/RS
Utilization %
1 2 3 4 5 6 7 8
PWR COL FX/ON
78 x 653 4 21
100BaseTX Class Repeater
II
FX
8
MDI-X MDI
1 12 25 50 100
Link / Act
Error / Partition
Fast EtheRx KNE8TX/RS
8-Port Model
100BaseTX Fast Ethernet Stackable Hub
KNE12TX/RS
Utilization %
1 12 25 50 100
Link / Act
1 2 3 4 5 6 7 8 9 10 11 12
Error / Partition
PWR COL FX/ON
1211 12 x 109 11 12 x 1097 8 653 4 21
100BaseTX Class Repeater
II
FX
MDI-X MDI
Fast EtheRx KNE12TX/RS
12-Port Model
Fast EtheRx KNE24TX/RS
24
5 6 78 9101112
17 18 19 20
1234
13 14 15 16 21 22 23 24
Class
II
Repeater
100BASE-TX
PWR COLL
FX
FX/ON
KNE24TX/RS
1234
13 14 15 16
5678
17 18 19 20
9101112
21 22 23 24
UTIL%
502512160
Link / Act / P rtition
St ck ble 100BASE-TX
F st Ethernet Hub

4 Introduction
Kingston Technology Company KNE24TX/RS User’s Guide - Rev. A01
Special Features
•100BASE-TX Class
I
or Class II compliant repeater
•Stack up to six Fast EtheRx hubs to create a single repeater unit
•8, 12, or 24 UTP ports for 100BASE-TX connection
•8, 12, or 24 Link, Activity, and Partition/Error Status LEDs for easy
troubleshooting
•Optional 100BASE-FX modules available (SC or ST connectors)
•Utilization LEDs display network traffic in five LED percentage levels
•Power LED and Collision LED for collision detection
•Automatic partition and reconnection
•Uplink Ports support both crossover and straight-through cable wiring for
cascading to another 100BASE-TX Class II repeater
•Conforms to IEEE 802.3u 100BASE-TX standard and Repeater for
100Mb/s baseband networks
•Internal auto-sensing universal power supply operating at 100-240VAC
(50/60Hz)
•19-inch Rack Mountable with mounting kit included
Package Contents
Your Fast EtheRx Stackable package should contain the following items:
ο Fast EtheRx Stackable 8-, 12-, or 24-Port Fast Ethernet Hub
KNE8TX/RS or KNE12TX/RS or KNE24TX/RS
ο50-pin shielded stacking cable
οAC power cord
οMounting kit includes:
(2) Angle brackets
(8) Bracket mounting screws
(4) 10/32” Rack-Mount screws
(4) Rubber Feet
οUser's Guide
If any of the items are missing or damaged, please contact your Kingston
dealer for a replacement. Be sure the items you receive are genuine Kingston
Technology products. If the Kingston name and logo are not on the front panel
of your unit, it’s not a genuine Kingston product.

Design Features 5
KNE24TX/RS User’s Guide - Rev. A01 Kingston Technology Company
Design Features
The Fast EtheRx 100BASE-TX hubs comply with the full set of repeater
functions as defined by IEEE 802.3u, clause 27. These functions include all
Repeater Functions, Signal Regeneration, Jabber Lockup Protection, Collision-
Handling, Error-Handling, and Auto Partitioning/Reconnection. These
functions are usually transparent to all network activities and are summarized
below.
Repeater Functions
If any single port senses the start of a valid packet on its receiving line, the Fast
EtheRx hub will re-transmit the received data to all other ports on the network.
The retransmission of packets complies with the IEEE 802.3u specification in
terms of preamble structure, voltage amplitude, and timing characteristics.
These timing regeneration’s prevent cumulative signal loss, jitter, and
distortion caused by the network cabling, and allow the Fast EtheRx Hubs to be
uplinked to another 100BASE-TX switching hub or cascaded to other Class
II
Repeater.
Jabber Lock-up Protection
The Fast EtheRx hubs implement a built-in jabber protection scheme to ensure
that the network is not disabled due to transmission of excessively long data
packets. This protection scheme will automatically interrupt the reception of
abnormally long streams of data to prevent jabber lock-up.
Collision-Handling
The Fast EtheRx hubs will perform collision detection and respond to collision
conditions as defined in the IEEE 802.3u specifications.
Error-Handling
With 100BASE-TX Fast Ethernet, the new error-handling feature prevents sub-
standard links from generating streams of false carrier and interfering with
other links.

6 Hardware Installation
Kingston Technology Company KNE24TX/RS User’s Guide - Rev. A01
Automatic Partitioning / Reconnection
If any of the ports on the Fast EtheRx Hub experience excessive numbers of consecutive
collisions, duration collisions, or faulty conditions, that particular port can be partitioned.
Once partitioned, the hub will continue to monitor that port. If the error conditions have
been corrected or a good data packet is transmitted without incurring a collision, the hub
will automatically reconnect that port to the network.
Hardware Installation
Before you begin installing network cables, please take a few moments to familiarize
yourself with the front panel of your Fast EtheRx Hub. The functions on the front and
rear panels are illustrated below.
Front Panel
Fig. 1. Front Panel - 24-Port Model
Power LED
The green LED indicates the power status. The LED will light when the AC power cord
is connected from a power source to the hub and the power switch is turned on.
Collision LED
The amber LED displays the collision status. If a collision is detected on the network, the
amber LED will flash. For the Fast Ethernet CSMA/CD network, collisions can be quite
common. A collision occurs when two or more stations try to transmit data
simultaneously. Both stations will stop transmitting and then re-transmit after a random
period of time.
Fiber Module Detection LED
The Fiber Module Detection LED will light up if the optional 100FX module is installed.
This LED will not light up if the optional 100FX module is not installed.
24
5678 9101112
17 18 19 20
1234
13 14 15 16 21 22 23 24
Class
II
Repeater
100BASE-TX
PWR COLL
FX
FX/ON
KNE24TX/RS
1234
13 14 15 16
5678
17 18 19 20
9101112
21 22 23 24
UTIL%
502512160
Link / Act / P rtition
St ck ble 100BASE-TX
F st Ethernet Hub
Power LED
Collision LED
Fiber Module Detection LED Utilization LEDs
Link / Activity / Partition LEDs
Uplink Ports
1 BASE-TX UTP Ports

Hardware Installation 7
KNE24TX/RS User’s Guide - Rev. A01 Kingston Technology Company
UTP Port LEDs
The UTP Port LEDs indicate Link, Activity, Error, and Partition status. If a
good link is established on any given port, the green LED will be continuously
lit, indicating a valid network connection between the network node and the
hub. When data is received, the LED will flash green. If the port is partitioned
or encounters an error, such as jabber, false carrier, misalignment, or invalid
packet, the LED will flash amber.
If an LED does not indicate a good link, check the following:
1. Make sure the power is turned on for both the PC and Fast EtheRx
Hub. The power LED should be lit.
2. Verify the network drivers have been loaded on the PC. Some adapters require
the drivers to be loaded to establish a proper link.
3. Make sure the cable is wired properly and connected on both ends.
4. If steps 1, 2, and 3 are correct, the cable may be defective or not wired
correctly. Replace the cable and try again. Please refer to Appendix A
for pin assignments and Appendix B for cabling guidelines.
Utilization LEDs
There are five utilization LEDs to display the amount of network traffic in five
percentage levels. The amount of data traffic is measured in frames per second
(FPS), then calculated into the following percentage forms: 1%, 12%, 25%,
50%, and 100%. The appropriate LED will light based on the network activity.
UTP and Uplink Ports
The UTP ports on the front panel, numbered 1 through 8 (KNE8TX/RS), 1
through 12 (KNE12TX/RS), or 1 through 24 (KNE24TX/RS), support
100BASE-TX connections. Since the crossover function is implemented on all
UTP MDI-X ports, a straight-through cable should be used to connect to a
workstation. The last UTP port on each model has two (2) RJ-45 connectors
for support of cabling in the crossover and straight-through configuration.
Only one of the two ports, MDI-X or MDI ( or ), may be used.

8 Hardware Installation
Kingston Technology Company KNE24TX/RS User’s Guide - Rev. A01
Using a Straight-Through Cable
Using a Crossover Cable
Notes on MDI and MDI-X Ports
MDI (Media Dependent Interface) is the standard that defines the mechanical
and electrical configuration of a UTP port. For any two devices to
communicate with each other on the network, the transmitter of one device
must be connected to the receiver of the other device. This can be achieved by
using a crossover cable, or by using the MDI-X port, which implements the
crossover internally.
Ports 1 thru 7 (KNE8TX/RS), ports 1 thru 11 (KNE12TX/RS), and ports 1 thru
23 (KNE24TX/RS), like all normal hub ports, are configured as MDI-X. The
last UTP port has two (2) RJ-45 connectors in order to support both MDI and
MDI-X configurations for flexibility when uplinking to another Class
II
repeater using either cable type. All NICs (Network Interface Cards) and
Router ports are usually by default configured as MDI. A simple illustration
shows the relationship of cable types to port types:
Port
Connector
Port
Config
For Connection to
Another Hub Port (MDI-X)
For Connection to a Network
Adapter or Router (MDI)
MDI-X Use Crossover cable Use Straight-through cable
MDI Use Straight-through cable Use Crossover cable
Table 1. Port Configurations
Use the MDI-X port
when connecting to
a network card or
other MDI device.
Use the MDI port
when connecting to
a hub or other MDI-X
device.
8
8
8 8
Use the MDI port
when connecting to
a network card or
other MDI device.
Use the MDI-X port
when connecting to
a hub or other MDI-X
device.
8 88 8

Hardware Installation 9
KNE24TX/RS User’s Guide - Rev. A01 Kingston Technology Company
Rear Panel
100-240VAC / 50-60Hz 2.0A Max PWR
OUT
IN
Stackable Module100FX Fiber Module
100-240VAC / 50-60Hz 2.0A Max PWR
OUT
IN
Stackable Module100FX Fiber Module
100-240VAC / 50-60Hz 2.0A Max PWR
OUT
IN
Stackable Module100FX Fiber Module
100BASE-FX Fiber Optic
Plug-in Module
(optional) Dual Fan Units Stacking Ports Power
Switch
AC Power
Connector
Fig. 2. Hub Rear Panels with Stacking Cables
Power Switch
The power switch toggles power on and off to the unit. The switch can also be
used to reset the Fast EtheRx hub.
AC Power Connector
The Fast EtheRx hubs use an auto-sensing 100VAC-240VAC, 50/60Hz
internal power supply. Connect the AC power cord from the rear of the unit to
an AC electrical outlet.
WARNING: For safety reasons, DO NOT attempt to open and
service the unit. There are no user-serviceable components
inside.
Fan Units
The Fast EtheRx hubs use two independent cooling fans for optimum air flow
to safeguard the unit from unnecessary heat exposure.
100FX Fiber Module (Optional)
Kingston offers an optional plug-in module to support 100BASE-FX Fiber
Optic cabling. There are two models to support both Straight-Tip (ST) and
Subscriber Connect (SC) type connectors:
• KNE100TX/RST for ST connectors

10 Hardware Installation
Kingston Technology Company KNE24TX/RS User’s Guide - Rev. A01
• KNE100TX/RSC for SC connectors.
Stacking Fast EtheRx Hubs
The Fast EtheRx hubs use stacking ports located on the rear panel to stack up
to six hubs in any combination of 8-Port, 12-Port, or 24-Port models. Follow
the directions below to stack up to six hubs together:
1. Locate the 50-pin shielded stacking cable included with your
package contents.
2. Plug one end of the cable into the port labeled, “Out” on the first
hub.
3. Plug the other end of the cable into the “In” port on the second hub.
4. Connect the AC power cord to each hub, then flip the power switch
to turn on power to the unit.
5. Repeat the process to stack additional hubs up to a maximum of six
(6) hubs.
Figure 3 below illustrates the configuration for stacking six of the 12-port
model hubs, expanding the total number of UTP port connections from 12 to
72 UTP ports, while still being recognized as one single repeater unit on the
network. A maximum of six (6) Fast EtheRx hubs can be stacked in any
combination of 8-, 12-, and 24-port models.
100-240VAC / 50-6
OUT
IN
Stackable Module
100-240VAC / 50-6
OUT
IN
Stackable Module
100-240VAC / 50-6
OUT
IN
Stackable Module
100-240VAC/ 50-60Hz 2.0A Max PWR
OUT
IN
StackableModule100FXFiber Module
100-240VAC/ 50-60Hz 2.0A Max PWR
OUT
IN
StackableModule100FXFiber Module
100-240VAC/ 50-60Hz 2.0A Max PWR
OUT
IN
StackableModule100FXFiber Module
100-240VAC/ 50-60Hz 2.0A Max PWR
OUT
IN
StackableModule100FXFiber Module
100-240VAC/ 50-60Hz 2.0A Max PWR
OUT
IN
StackableModule100FXFiber Module
100-240VAC/ 50-60Hz 2.0A Max PWR
OUT
IN
StackableModule100FXFiber Module
Stack
up to
6 hubs
maximum
Fig. 3. Stacking Additional Hubs

Hardware Installation 11
KNE24TX/RS User’s Guide - Rev. A01 Kingston Technology Company
Installing the 100FX Module (Optional)
Kingston offers two optional plug-in modules to support 100BASE-FX Fiber
Optic cabling with either SC (Subscriber Connector) or ST (Straight Tip)
connector types. Model KNE100FX/RSC supports SC-type connectors. Model
KNE100FX/RST supports ST-type connectors.
To upgrade your Fast EtheRx Stackable Fast Ethernet hub with either of the
100BASE-FX plug-in modules, follow the directions below. The procedure
requires a Philips head screwdriver.
1. Locate the faceplate labeled “100FX Fiber Module” on the rear
panel of the hub.
2. Remove the four philips head screws to remove the faceplate.
3. Next, insert the plug-in module into the open slot. Press firmly to
secure the module into the socket connector.
4. Re-install the four screws to secure the faceplate to the hub.
5. The FX/ON LED will display a solid light if properly installed.
Figure 4 below illustrates the KNE100FX/RSC with SC-type connectors
installed into the rear panel of your EtheRx hub. Figure 5 shows the
KNE100FX/RST with ST-type connectors installed.
100FX Fiber Module
TX RX
100FX Fiber Module
TX RX
Fig. 4. Model KNE100FX/RSC Fig. 5. Model KNE100FX/RST
with SC connectors with ST connectors

12
Kingston Technology Company KNE24TX/RS User’s Guide - Rev. A01
Appendices

Appendix A Pin Assignments 13
KNE24TX/RS User’s Guide - Rev. A01 Kingston Technology Company
Appendix A Pin Assignments
UTP Port Pin Assignments
The UTP ports use RJ-45 Unshielded Twisted Pair (UTP) cabling. Connector
pin numbers and pin wiring assignments are listed below in Figure A-1.
Twisted-Pair cables can be wired with either straight-through or crossover pin
assignments. Both wiring schemes are mentioned in "Appendix B Cabling
Guidelines" for reference in creating a twisted-pair cable.
Fig. A-1 RJ-45 Connector Pin Numbers
Pin Number MDI-X MDI
1 Receive Data + Transmit Data +
2 Receive Data - Transmit Data -
3 Transmit Data + Receive Data +
4,5 Not Used Not Used
6 Transmit Data - Receive Data -
7,8 Not Used Not Used
Table A-1 UTP Pin Assignments
24
5 6 78 9101112
17 18 19 20
1234
13 14 15 16 21 22 23 24
Class
II
Repeater
100BASE-TX
PWR COLL
FX
FX/ON
KNE24TX/RS
1234
13 14 15 16
5678
17 18 19 20
9 101112
21 22 23 24
UTIL%
502512160
Link / Act / P rtition
St ck ble 100BASE-TX
F st Ethernet Hub
1 2 3 4 5 6 7 8
Modular
Connector
The UTP port labeled 24= is a standard straight-through UTP port.
All other UTP ports are configured as MD -X, or internally crossed.
By default, all repeating and switched UTP ports are generally
configured as MD -X, unless otherwise specified. See Notes on MD
and MD -X for more details.

14 Appendix B Cabling Guidelines
Kingston Technology Company KNE24TX/RS User’s Guide - Rev. A01
Appendix B Cabling Guidelines
Cable Type
When connecting network cables, the following table shows appropriate
cabling guidelines for 100BASE-TX Fast Ethernet architecture.
Ethernet Standard: 100BASE-TX
Trunk and Patch Cable
Type:
4-Pair 100ΩUTP CAT 5
(only 2 pairs used)
Max. Cable Length:
Hub to Workstation
Hub to Hub
100M (328ft)
5M (16.4ft)
Modular Plug: 8-Pin RJ-45 CAT 5 only
Patch Panel: 8-Pin RJ-45 CAT 5 only
Network Topology: Star
Table B-1. Network Cable Guidelines
UTP Cable Wiring
100BASE-TX unshielded twisted-pair cables can be wired as "Straight-
Through" or, in some cases, "Cross-Over" depending on the application. For
workstations connected to a hub, use "Straight-Through' wiring illustrated
below in Table B-2. In some instances (e.g. cascading from one hub to
another), you may use "Cross-Over" wiring illustrated below in Table B-3.
"Straight-Through" Crossover”
Cable Wiring Cable Wiring
1 (TRX +)
2 (TRX -)
3 (RCV +)
6 (RCV -)
4, 5, 7, 8
1 (TRX +)
2 (TRX -)
3 (RCV +)
6 (RCV -)
Not Used
Pin Number Pin Number
1 (TRX +)
2 (TRX -)
3 (RCV +)
6 (RCV -)
4, 5, 7, 8
3 (RCV +)
6 (RCV -)
1 (TRX +)
2 (TRX -)
Not Used
Pin Number Pin Number
Table B-2. Straight-Through Wiring Table B-3. Cross Over Wiring