HP AdvanceStack 100Base-T Hub-8TXE
Installation and Reference Guide
© Copyright 1996 Hewlett-Packard Company
All Rights Reserved
Reproduction, adaptation, or translation without prior written permission is prohibited,
except as allowed under the copyright laws.
Publication Number
J3235-90001
Edition 1
November 1996
Applicable Product
HP J3235A AdvanceStack 100Base-T Hub-8TXE
Disclaimer
The information contained in this document is subject to change without notice.
HEWLETT-PACKARD COMPANY MAKES NO WARRANTY OF ANY KIND
WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. Hewlett-Packard shall not be liable for errors contained
herein or for incidental or consequential damages in connection with the furnishing,
performance, or use of this material.
Hewlett-Packard assumes no responsibility for the use or reliability of its software on
equipment that is not furnished by Hewlett-Packard.
Warranty
See the warranty booklet included with the product.
A copy of the specific warranty terms applicable to your Hewlett-Packard product and
replacement parts can be obtained from your HP sales and service office or HP
authorized reseller.
Hewlett-Packard Company
8000 Foothills Boulevard, m/s 5551
Roseville, California 95747-5551
http://www.hp.com/go/network_city
Package Contents
Carefully unpack the contents of the package and verify them against the
checklist given below.
Package Checklist
æ HP AdvanceStack 100Base-T Hub-8TXE (Part No. HP J3235A)
æ Power cord, one of the following:
Australia/New Zealand (8120-6810)
Denmark (8120-6814)
Europe (8120-6811)
Japan (8120-6798)
Switzerland (8120-6815)
United States/Canada (8120-6812)
United Kingdom (8120-6809)
æ Four rubber foot pads
æ Installation and Reference Guide (J2325-90001)
æ Warranty booklet
Please inform your dealer immediately should there be any wrong, missing, or
damaged parts.
If possible, retain the carton, including the original packing materials. Use
them again to repack the unit in case there is a need to return it for repair.
Package Contents i
Quick Inst allation
The HP J3235A AdvanceStack 100Base-T Hub-8TXE contains 8 100Base-TX
Fast Ethernet ports. The smart design built into the front display panel
provides a friendly interface that simplifies installation and network
troubleshooting. If you are already familiar with basic network operations, you
should be able to install this hub as described below:
1. Unpack the HP Hub-8TXE.
2. Find a location close to the network devices you need to connect, and within
easy reach of an electrical outlet.
3. Mount the hub on a desktop or any other flat surface. If you are installing
multiple hubs, you can stack them on top of each other (after attaching the
foot pads).
4. Connect any devices that use a standard network interface to the RJ-45
(MDI-X) ports (e.g., a workstation, server, bridge or router). Use 100
Category 5 STP or 100W Category 5 UTP cable to connect to the hub, and
be sure the length of any twisted-pair connection does not exceed 100
meters. Refer to Chapter 3 for sample configurations.
5. To cascade to another hub or switch, run straight-through twisted-pair cable
from the (8MDI) cascade port on this switch to any (MDI-X) port on the
other device (or vice versa). Refer to Figure 3.2.
If necessary, you can also cascade between two ports using crossover cable.
However, be sure not to exceed the maximum length between end nodes as
described in Chapter 2.
Quick Installation iii
W
HP Hub-8TXE Installation and Reference Guide
6. This hub can serve as a stand-alone repeater for small networks, can be
cascaded with compatible devices (e.g., Fast Ethernet hub or switch), or can
be connected to a network interconnection device (e.g., Fast Ethernet bridge
or router).
7. Verify network communications by ensuring that:
• you have made all the necessary connections
• you can access any connected resources
• the hub’s indicators are functioning properly
If you encounter any problems in installing the HP Hub-8TXE, refer to Chapter 2
for a detailed description of installation procedures, Chapter 3 for sample
configurations, or Appendix A for help in troubleshooting.
Note: Refer to Chapter 2 for a more detailed description of calculating the maximum cable
length permitted between two end nodes for Fast Ethernet.
iv Quick Installation
About this Guide
This guide is designed for the experienced network installer. It describes how
to install and operate the HP Hub-8TXE. After reading this manual, you should
be able to use the front display panel and configure options to manage all your
network connections.
This manual covers the following topics:
Chapter 1 -
Product Overview
Brief description of Fast Ethernet, followed by a description of this hub and a
summary of its important features and specifications.
Chapter 2 -
Installing the System
Installing an HP Hub-8TXE and making basic network connections.
Chapter 3 -
Configuring the Network
Shows sample network configurations for a local area network.
Chapter 4 -
Hardware Reference
Detailed description of indicator panel and ports.
Appendices -
Troubleshooting, cable assignments, and product specifications.
About this Guide v
Contents
Chapter 1: Product Overview................................................. 1-1
Introduction to Fast Ethernet.....................................................................................1-1
HP Hub-8TXE...........................................................................................................1-1
Basic Features ...........................................................................................................1-2
Chapter 2: Installing the System............................................ 2-1
Pre-Installation Requirements ...................................................................................2-1
Connecting the Hub System......................................................................................2-2
Making a Connection via an MDI-X Port ............................................................2-2
Making a Connection via the MDI Cascade Port .................................................2-3
Distance Limit for Fast Ethernet Cabling.............................................................2-3
Providing Power to the Hub......................................................................................2-4
Verifying Port Status.................................................................................................2-4
Verifying System Operation......................................................................................2-5
Chapter 3: Configuring the Network......................................3-1
Stand-Alone...............................................................................................................3-1
Connecting Multiple Hubs ........................................................................................3-2
Chapter 4: Hardware Reference.............................................4-1
Front Panel ...............................................................................................................4-1
Power..............................................................................................................4-2
Statistical Display for System Performance....................................................4-3
Port Status Display...............................................................................................4-4
RJ-45 Fast Ethernet Ports.....................................................................................4-5
Rear Panel ...............................................................................................................4-6
Power Socket........................................................................................................4-6
vii
HP Hub-8TXE Installation and Reference Guide
Appendix A: Troubleshooting................................................A-1
Diagnosing Hub Indicators........................................................................................A-1
System Diagnostics ...................................................................................................A-2
Power and Cooling Problems ...............................................................................A-2
Installation............................................................................................................A-2
Physical Configuration.........................................................................................A-3
Hub Integrity ........................................................................................................A-3
A p pendi x B: Por t and Cable As s i gnmen ts.............................B-1
RJ-45 Port ...............................................................................................................B-1
Appendix C: Specifications.................................................... C-1
Product Specifications...............................................................................................C-1
Appendix D: Safety and Regulatory Statements..................D-1
Power Precautions......................................................................................................D-1
Safety Information......................................................................................................D-2
Informations concernant la sécurité............................................................................D-3
Hinweise zur Sicherheit..............................................................................................D-4
Considerazioni sulla sicurezza ...................................................................................D-5
Consideraciones sobre seguridad ...............................................................................D-6
Safety Information (Japanese)....................................................................................D-7
Regulatory Statements................................................................................................D-8
Appendix E: Product Support Services ................................E-1
Glossary
Index
viii Contents
HP Hub-8TXE Installation and Reference Guide
List of Figures
Figure 3.1 Stand-Alone Configuration....................................................................3-1
Figure 3.2 Multiple Hub Configuration Using the Cascade Port.............................3-2
Figure 4.1 Front Panel.............................................................................................4-1
Figure 4.2 Indicators ...............................................................................................4-2
Figure 4.3 Rear Panel ..............................................................................................4-6
Figure B-1 RJ-45 Connector (on the Hub Side) .......................................................B-1
List of Tables
Table B-1 RJ-45 Pin Assignments............................................................................B-1
Contents ix
Chapter 1: Product Overview
Introduction to Fast Ethernet
Standard 10 Mbits/s Ethernet has served well for past generations of 286 and
386 machines performing simple file transfers. However, with the inevitable
growth in corporate network size and the introduction of fully-functional 32-bit
PC architectures, and operating systems running complex applications, 10 Mbits/s
Ethernet has become a serious bottleneck.
With the recent flood of choices for upgrading media bandwidth, 100 Mbits/s
Fast Ethernet has become the most popular because of its low cost, compatibility
with existing Ethernet applications, and the fact that it can run on top of an
installed base of twisted-pair cabling. Fast Ethernet can be easily integrated
into an existing 10 Mbits/s Ethernet environment with no need for protocol
translation or changes to network software.
HP Hub-8TXE
The HP J323SA AdvanceStack 100Base-TX Hub-8TXE includes 8 Fast
Ethernet ports. It provides a friendly design that simplifies installation and
network troubleshooting. The indicator panel includes Utilization and
Collision rate LEDs, as well as Partition, Link and Traffic LEDs to ease
network management.
The HP Hub-8TXE can be used to relieve common network congestion,
regardless of whether it is caused by too many stations contending for limited
bandwidth or by a server that is supporting too many users. It can significantly
improve access both to key servers and to the network backbone. This hub not
only delivers a vast improvement in network response time, but helps you
maintain outstanding performance as your user community continues to grow.
Product Overview 1-1
HP Hub-8TXE Installation and Reference Guide
Basic Features
• Transmits data at 100 Mbits/s for demanding applications
• Conforms to the IEEE 802.3u repeater specification for 100Base-TX
• Provides 8 RJ-45 100Base-TX ports (using MDI-X wiring)
• Port 8 can serve as an MDI-X port (for connection to network devices such
as workstations or servers) or as an MDI daisy-chain port (for connection to
network devices such as hubs or switches), eliminating the need for
crossover cables
• Supports 100Ω Category 5 shielded or unshielded cable (STP or UTP)
• Friendly design that monitors network utilization, collisions, link and port
partition status
• LED indicator panel includes Utilization and Collision rate indicators for
reporting hub activity and facilitating problem diagnosis
• Automatically partitions bad ports to protect the network system
• Automatic polarity detection and correction permits automatic adjustment
for wiring errors
• Plug-and-play operation
The HP Hub-8TXE also supports the following basic system safeguards:
• This hub features automatic partitioning and reconnection, jabber lockup
protection, and automatic polarity detection for network cabling.
• With automatic partitioning and reconnection, any port is automatically
isolated if excessive collisions occur on it. When the condition is corrected,
the port is automatically reconnected.
1-2 Product Overview
HP Hub-8TXE Installation and Reference Guide
• With the jabber lock-up function, the hub automatically stops transmission
of abnormal Ethernet frames that may cause data loss for all network users.
(Jabber refers to abnormal Ethernet frames which are much too long and
may come from a malfunctioning Ethernet card.)
• With automatic polarity detection, the hub recognizes and adjusts for
attached cable assemblies which may be wired with incorrect polarity on the
receive pair.
Product Overview 1-3
Chapter 2: Installing the System
This chapter provides information on installing the HP Hub-8TXE, establishing
network connections, and configuring the system. You may install this hub on
any level su rface (e.g., a table or shelf) o r in a stan da rd EIA equipment rack.
However, please take note of the following minimum site requirements before
you begin.
Pre-Installation Requirements
Before you start actual hardware installation, make sure you can provide the
right operating environment, including power requirements, sufficient physical
space, and proximity to other network devices that are to be connected. Verify
the following installation requirements:
• Power requirements: 100 to 127 VAC / 200 to 240 VAC
Hz. The hub’s power supply automatically adjusts to the input voltage level.
• The hub should be located in a cool dry place, with at least 10 cm. of space
at the front and back for ventilation.
• Place the hub out of direct sunlight, and away from heat sources or areas
with a high amount of electromagnetic interference.
• Check if network cables and connectors needed for installation are available.
• Find a suitable location at the center of the devices you want to link, and
near a power outlet.
(± 10%) at 50 to 60
Installing the System 2-1
HP Hub-8TXE Installation and Reference Guide
Connecting the Hub System
The HP Hub-8TXE has 8 RJ-45 ports and 1 RJ-45 cascade port. The ports
allow you to make connections to dev ices such as a work station, server, bridge or
router. You can also cascade to another compatible hub or switch by
connecting an MDI port on one device (e.g ., port
port on the other device. Or you can cascade from an MDI port on another
device to any MDI-X port on this hub. See Figure 4.1.
Making a Connection via an MDI-X Port
You can connect an RJ-45 port on the hub to any device that uses a standard
network interface such as a workstation or server, or also to a network
interconnection device such as a bridge or router (depending on the port type
implemented).
1. Prepare the network devices you wish to network. Make sure you have
installed suitable 100BASE-TX network interface cards for making a
connection to any of the hub’s ports. You also need to prepare straightthrough shielded or unshielded twisted-pair ca b l e s with RJ-45 pl u gs at bo t h
ends. Use 100
W Category 5 c a b le f o r a l l connections.
8MDI on this hub) to an MDI-X
2. Connect one end of the cable to the RJ-45 port of the network interface card,
and the other end to any available (MDI-X) port on the hub. When inserting
an RJ-45 plug, be sure the tab on the plug clicks into position to ensure that it
is properly seated. Using the hub in a stand-alone configuration, you can
network up to 8 nodes.
I
Notes:
2-2 Installing the System
Do not plug a phone jack connector into the RJ-45 port. This may damage the hub.
Use only twisted-pair cables with RJ-45 connectors that conform with FCC standards.
1. When connecting to port 8, do not use port 8 MDI-X.
2. Make sure each twisted-pair cable does not exceed 100 meters.
HP Hub-8TXE Installation and Reference Guide
Making a Connection via the MDI Cascade Port
1. To make a direct connection to another compatible repeater or switch, use the
8MDI cascade port. When connecting to this port, remember not to use port
8MDI-X.
2. Prepare straight-through shielded or unshielded twisted-pair cables with RJ-45
plugs at both ends. Use 100
one end of the cable to Port 8MDI on this hub, and the other end to a standard
MDI-X port on the other device. When inserting an RJ-45 plug, be sure the
tab on the plug clicks into position to ensure that it is properly seated.
W Category 5 cable for all connections. Connect
Notes:
1. When connecting to Port 8MDI, do not use Port 8MDI-X.
2. Make sure the length of twisted-pair cable does not exceed 100 meters.
3. To connect to another hub or switch, you may also run straight-through
twisted-pair cabling from an MDI-X port on this hub to a cascade port on
another device. However, if you must connect to another hub or switch via
similar port types at both ends of the cable, use crossover cabling.
Distance Limit for Fast Ethernet Cabling
For 100Base-TX, network diamter is very important, because each packet must
propagate through the Ethernet collision domain before the next packet is sent.
Every 100Base-TX hub (repeater) adds a small propagation delay to the packet,
which can be equated to a certain number of bit times. The propagation delay
(repeater delay) of the HP Hub-8TXE is 80 bit times, or a cable equivalent
length of 72 meters.
The 100Base-TX maximum cable distance (“network diameter”) is 367 meters.
And the maximum distance from a hub to an end-node is 100 meters. To
cascade two 100Base-TX Hub-8TXEs together, we must do this calculation:
For an end-node on one hub to communicate with an end-node on the other
hub, the cable distance from end-nodes to hubs would be 100m + 100m
(perhaps a bit less, but we should consider “worst case”). The packets would
Installing the System 2-3
HP Hub-8TXE Installation and Reference Guide
traverse through both hubs, for a cable equivalent length of 72m + 72m. This
gives:
100m
100m
72m
+ 72m
--------
344m
The maximum “network diameter” for 100Base-TX is 367m, so we can use a
maximum of 367m - 344m, or 23m between the two hubs. Figure 3-2
illustrates this example.
Providing Power to the Hub
1. Power on the hub by plugging the power cord into the power socket at the
rear of the hub, and the other end into a power outlet.
2. Check the LED marked
Power on the front panel to see if it is on. The unit
will automatically select the setting that matches the connected input voltage.
Therefore, no additional adjustments are necessary when connecting it to
any input voltage within the range marked on the rear panel.
Verifying Port Status
Check each connection by viewing the port status indicators listed below. (For
a more detailed description of these indicators, refer to Chapter 4.)
Link Indicates that the port has established a valid network connection.
Traffic Indicates traffic traversing the port.
Partition Indicates that the port has been isolated from the hub when pre-
defined collision threshold has been reached.
2-4 Installing the System
HP Hub-8TXE Installation and Reference Guide
If the Link status indicator is not functioning properly, or you experience any
other difficulties in setting up the hub, refer to Appendix A.
Verifying System Operation
Verify that all attached devices have a valid connection. The hub monitors
link status for each port. If any device is properly connected to the hub and
transmitting a link beat signal, the Link indicator lights up for the corresponding
port. If the Link indicator fails to light up when you connect a device to the
hub, check the following items:
• Be sure the twisted-pair cable is properly attached to the connected device
and the hub. Verify that the RJ-45 plug snaps into place when attached.
• See if the twisted-pair cable is functioning properly by using it for another
port and attached device that already displays valid indications when
connected to the network.
• Check the length of the twisted-pair connection to be sure it does not exceed
100 meters.
• Verify that the cable is Category 5.
• Test the adapter for an attached workstation by trying it in another computer
that has been successfully connected to the network.
If you still can’t resolve the problem, please refer to
Installing the System 2-5
Troubleshooting in Appendix A.
Chapter 3: Configuring the Network
The HP Hub-8TXE allows great flexibility in configuring your network. You
can use it in a stand-alone or multiple hub configuration. Some of the common
applications for this Fast Ethernet hub are described in this chapter.
Stand-Alone
This hub can be used in a simple stand-alone configuration as illustrated below.
In compliance with IEEE 802.3u standards, the maximum cable distance
between the hub and any workstation is 100 meters for twisted-pair cable.
Figure 3.1 Stand-Alone Configuration
Configuring the Network 3-1
HP Hub-8TXE Installation and Reference Guide
Connecting Multiple Hubs
You can easily connect to another hub via the MDI cascade port. Figure 3.2
shows a sample configuration.
Figure 3.2 Multiple Hub Configuration Using the Cascade Port
3-2 Configuring the Network
Chapter 4: Hardware Reference
Before connecting any network device to this hub, please review Chapter 2 for
information on system installation and Chapter 3 for a brief look at common
network architectures. This chapter describes the hardware features of the HP
Hub-8TXE. For easier management and control of the hub, familiarize yourself
with the display indicators and ports.
Front Panel
There are 8 RJ-45 MDI-X ports and 1 RJ-45 MDI cascade port on the front
panel. Moreover, the system indicators provide a simple interface for
monitoring the hub. The front panel includes a power indicator, a statistical
display for network traffic, and port status indicators as shown below.
100BASE-TX Class II Repeater
Figure 4.1 Front Panel
The indicator panel simplifies monitoring of various network conditions by
providing LEDs that indicate the status of each port and the overall condition of
the hub. It provides all the key information required to manage your network
on a daily basis. The following pages list the indicators and their functions.
Hardware Reference 4-1
HP Hub-8TXE Installation and Reference Guide
The front panel array provides indicators that show the utilization of network
bandwidth and indicate the status of po r t co n n e c t io n s . It inc lu d e s port status
indicators and a statistical display for network traffic as shown below.
Figure 4.2 Indicators
Power
Color: Green
Function: Power indicator
Condition Indication
ON Unit is receiving power.
OFF Power is disconnected, no power received.
4-2 Hardware Reference
HP Hub-8TXE Installation and Reference Guide
Statistical Display for System Performance
Utilization - (Utilization%) The statistical indicators show the percentage of valid data
passing through all ports compared to overall network bandwidth (updated every
0.5 seconds). There are 5 LEDs representing the percentage of network utiliz ation.
The corresponding LEDs light up to show that the utilization of LAN bandwidth
has reached this level. When active, these LEDs behave like a stereo’s equalizer
display.
For example, if network utilization reaches 1%, the LED labeled 1% will light up.
However, if network utilization rises above 1% (e.g., 30%), the LED labeled 30
and all the other LEDs before it (i.e., 1, 5 and 15) will also light up in rapid
succession. These indicators monitor the share of valid network frames handled
by the hub within a 100 Mbit/s bandwidth. They provide a quick way to monitor
the current traffic load relative to the network’s capacity.
Collision - (Collision%) The statistical indicators show the percentage of packet
collisions occurring out of the total packets transmitted by the hub. Collisions
occur when two or more devices connected to a hub attem pt to transmit data
simultaneously on the network . When a collision occurs, dev ices pause and then
re-transmit after a pseudo- random wait period. Because wait periods differ among
devices, successive collisions become increasing ly improbable.
The Collision LEDs assist the network manager in monitoring the percentage of
packet collisions occurring relative to the total packets transmitted by the hub.
When collisions reach a level marked on the front panel display, the corresponding LED lights up. For exam ple, if pack et collisions reach 1%, the LED labeled
1% will light up. However, if collisions go beyond 1% (e.g., 15%), the LED
+
labeled 15
% and all the other LEDs before it (i.e., 1, 3, 5 and 10) also light up
in rapid succession.
Hardware Reference 4-3
HP Hub-8TXE Installation and Reference Guide
Note: If the hub displays a high collision rate, check to see if any of the connected
devices are malfunctioning or if a loop has been formed in your network connections.
Otherwise, you may need to reconfigure your network to balance the traffic load.
Port Status Display
Partition
Color: Orange
Function: Show s if th e p o r t h a s b e e n is o l at e d fr o m the n e twork
Condition Indication
ON Indicates port has been partitioned due to an abnormal network condition.
OFF Port is not partitioned.
A port is temporarily partitioned when a line error or too many collisions are
detected on the attached segment. While it is automatically partitioned, the
port continues to receive data from the segment. However, data is not
transmitted onto the segment. When the problem is corrected or a valid data
packet is received through the port, the port is automatically reconnected.
When partitioning occurs, the port’s corresponding Partition LED will be
continually lit (orange light). Otherwise, this LED should be OFF (unlit).
Note:
Link
When a long run of collisions occur on the cable connected to a hub port (i.e.,
64 collisions), that port is automatically partitioned by the hub. It is automatically
reconnected when a collision-free data packet at least 512 bits long (i.e., a
minimum size legal packet) passes through the port.
Color: Green
Function: Ind ic a t es a valid n e t w o r k connection associated with the port.
Condition Indication
ON Indicates a valid link has been established on this port.
OFF No valid link has been established on this port.
4-4 Hardware Reference
HP Hub-8TXE Installation and Reference Guide
Troubleshooting: If the Link LED does not light up when a dev ice is connected to its corre-
sponding port, check that both the hub and connected device are powered on. For devices
connected to the hub using twisted-pair cable, check that the cable length does not exceed
100 meters. You should have standard, straight-through cables and not crossover or other
specialized cables.
Traffic
Color: Green
Function: Indicates traffic entering the port.
Condition Indication
BLINKING Indicates the port is receiving packets; blinking is
proportional to the traffic entering the port.
OFF No packets are being received by this port.
RJ-45 Fast Ethernet Ports
This hub includes 8 Fast Ethernet ports on the front panel; of which Port 8 can
also serve as a cascade port. Connect the MDI-X ports to network devices such
as workstations or servers, and the MDI port to a network interconnection
device such as another hub or switch. Remember that you cannot connect to
port 8 MDI-X and Port 8 MDI at the same time.
Note: Use Category 5 straight-through twisted-pair cable (STP or UTP) for all standard
connections. However, if you must cascade between two hubs using similar port types
at both ends of the cable, use crossover cable.
Hardware Reference 4-5
HP Hub-8TXE Installation and Reference Guide
Rear Panel
The rear panel on the hub includes a full-range power socket.
Figure 4.3 Rear Panel
Power Socket
The power socket accepts AC power from 100-127 VAC to 200-240 VAC at 50
to 60Hz. The unit is equipped with a universal full-range power source.
4-6 Hardware Reference
Appendix A: Troubleshooting
Diagnosing Hub Indicators
This Fast Ethernet hub can be easily monitored through its comprehensive
panel indicators. These indicators assist the network manager in identifying
problems the hub may encounter. This section describes common problems
you may encounter and possible solutions.
Symptom: Power indicator does n o t l i g h t u p .
Cause: Defective power outlet, power cord, or internal power supply.
Solution: Check power cord and power source connections. If connections are
secure, then try a different outlet, or try a different power cord to see
if the power cord is the problem. If the problem persists, contact
your HP-authorized dealer or reseller.
Symptom: Partition indicator lights up.
Cause: Hub has partitioned a port.
Solution: If port partitioning has occurred, the hub will automatically enable
the port when the faulty condition disappears.
Symptom: Link/Traffic indic a t o r remains unlit afte r ma k i n g a c onnection.
Cause: Network interface (e.g., a LAN adapter on the attached device), network
cable, or hub port is defective.
Solution: Verify that the hub and attached device are powered on. Be sure the
cable i s p lu gged i n to b o t h th e hub a n d c o rr e s ponding device. Verify
that the proper cable type is used (Chapter 2), and that its length
does not exceed 100 meters. Check the LAN adapter on the attached
device and cable connections for possible defects. Replace the
defective LAN adapter or cable if necessary
Use the diagnostic procedures described in the following section to verify that
all other system components are functioning properly. If you still cannot
resolve the problem, contact your HP-authorized dealer or reseller.
Troubleshooting A-1
HP Hub-8TXE Installation and Reference Guide
System Diagnostics
Power and Cooling Problems
If the Power indicator does not turn on when the power cord is plugged in, you
may have a problem with the power outlet, power cord, or internal power
supply as explained in the previous section. However, if the unit powers off
after running for a while, check for loose power connections, power losses or
surges at the power outlet, and verify that the fan on the back of the unit is
unobstructed and running prior to shutdown. If you still cannot isolate the
problem, then the internal power supply may be defective. In this case, contact
your HP-authorized dealer or reseller for assistance.
Installation
Verify that all system components have been properly installed. If one or more
components appear to be malfunctioning (e.g., the power cord or network
cabling), test them in an alternate environment where you are sure that all the
other components are functioning properly.
Cabling
1. Verify that the cabling type is correct. Be sure all cable connectors are
securely seated in the required ports. Use 100
W Category 5 straight-through
cable for all standard twisted-pair connections.
2. Make sure all devices are connected to the network. Equipment may have
been unintentionally disconnected from the network.
3. When cascading two devices using RJ-45 ports at both ends of the cable
(i.e., not the MDI port), make sure a crossover cable is used. Crossover
cable should only be used if a cascade port is not available.
A-2 Troubleshooting
HP Hub-8TXE Installation and Reference Guide
LAN Adapters
Make sure the network interface hardware and software drivers for the attached
devices are function properly and are 100Base-TX. Check the LAN adapters
and associated drivers used in any attached workstation or server.
Physical Configuration
If problems occur after altering the network configuration, restore the original
connections, then try to track the problem down by implementing the new
changes, one step at a time. Ensure that cable distances and other physical
aspects of the installation do not exceed 100Base-TX specifications.
Hub Integrity
As a last resort verify the hub’s integrity with a power-on reset. Turn the
power to the hub off and then on a few times. If the problem still persists and
you have completed all the preceding diagnoses, contact your HP-authorized
dealer or reseller for further assistance. (Refer to Appendix E.)
Troubleshooting A-3
Appendix B:
Port and Cable A ssignments
RJ-45 Port
Figure B-1 RJ-45 Connector (on the Hub Side)
Pin
1 Receive Data + Transmit Data +
2 Receive Data - Transmit Data 3 Transmit Data + Receive Data +
6 Transmit Data - Receive Data -
4,5,7,8 Not Used Not Used
MDI-X Assignment
(Port 1 ~ 8)
Table B-1 RJ-45 Pin Assignments
MDI Assignment
(Cascade Port 8)
Schematics for both straight and crossover twisted-pair cable are shown below.
Straight-Through Crossover
(Hub) (Adapter) (Hub) (Hub)
1 IRD+ 1 OTD+ 1 IRD+ 1 IRD+
2 IRD- 2 OTD- 2 IRD- 2 IRD3 OTD+ 3 IRD+ 3 OTD+ 3 OTD+
6 OTD- 6 IRD- 6 OTD- 6 OTD-
Cable and Port Assignments B-1
Appendix C: Product Specifications
Transmission Technique Baseband
Topology Star or Tree
Access Method CSMA/CD, 100Mbit/s
Standards Conformance IEEE 802.3u 100BASE-TX Class II Repeater
Media Supported Unshielded or shielded twisted-pair cable
(100
W Category 5 STP/UTP)
Interfaces 8 RJ-45 MDI-X ports,
1 RJ-45 MDI cascade port
Hub-to-Workstation Distance 100 meters maximum using category 5 STP or UTP cable
Cascade Distance (2 hubs) 23 meters (assuming 100 meters from each node to hub)
Dimensions 273 mm x 166 mm x 42.9 mm
(10.75" x 6.54" x 1.69")
Power System 100~127/200~240 VAC, 1 Amp max., voltage tolerance 10%
50/60 Hz full range
Temperature 0°C to 40°C (Standard Operating)
Humidity 5% to 95% (Noncondensing)
Certification CE Mark
Emissions FCC Class A, VCCI Class 1, CISPR Class A
Safety UL1950
CSA95O
NOM-019-SCFI-1994
TÜV/GS
Acoustic Noise Geraeuschemission LwA= 50 dB
fiktiven Arbeitsplatz nach
DIN 45635T.19
Product Specifications C-1
Appendix D:
Safety and Regulatory Statements
This chapter covers the following topics:
■ power precautions
■ safety and regulatory statements
Power Precautions
Follow these precautions when unplugging and plugging in power to the hub.
Caution
If your installation requires a different power cord than the one supplied with the hub, be
sure to use a power cord displaying the mark of the safety agency that defines the
regulations for power cords in your country. The mark is your assurance that the power
cord can be used safely with the hub.
Note
The hub does not have a power switch; it is powered on when the power cord is plugged
in. The hub’s power supply automatically adjusts to any AC power source between 100127 volts and 200-240 volts. There are no voltage range settings to configure.
When installing the hub, note that the AC outlet must be installed near the equipment
and should be easily accessible.
Safety and Regulatory Statements D-1
HP Hub-8TXE Installation and Reference Guide
Safety Information
Documentation reference symbol. If the product is marked with this symbol, refer to the
product documentation to get more information about the product.
WARNING A WARNING in the manual denotes a hazard that can cause injury or death.
CAUTION A CAUTION in the manual denotes a hazard that can damage equipment.
Do not proceed beyond a WARNING or CAUTION notice until you have understood the
hazardous conditions and have taken appropriate steps.
Grounding
These are safety class I products and have protective earthing terminals. There must be
an uninterruptible safety earth ground from the main power source to the product’s input
wiring terminals, power cord, or supplied power cord set. Whenever it is likely that the
protection has been impaired, disconnect the power cord until the ground has been
restored.
For LAN cable grounding:
■ If your LAN covers an area served by more than one power distribution
system, be sure their safety grounds are securely interconnected.
■ LAN cables may occasionally be subject to hazardous transient voltages (such
as lightning or disturbances in the electrical utilities power grid). Handle
exposed metal components of the network with caution.
Servicing
There are no user-serviceable parts inside these products. Any servicing, adjustment,
maintenance, or repair must be performed only by service-trained personnel.
These products do not have a power switch; they are powered on when the power cord is
plugged in.
D-2 Safety and Regulatory Statements
HP Hub-8TXE Installation and Reference Guide
Informations concernant la sécurité
Symbole de référence à la documentation. Si le produit est marqué de ce symbole,
reportez-vous à la documentation du produit afin d'obtenir des informations plus
détaillées.
WARNING Dans la documentation, un WARNING indique un danger susceptible d'entraîner des
dommages corporels ou la mort.
CAUTION Un texte de mise en garde intitulé CAUTION indique un danger susceptible de causer des
dommages à l'équipement.
Ne continuez pas au-delà d'une rubrique WARNING ou CAUTION avant d'avoir bien
compris les conditions présentant un danger et pris les mesures appropriées.
Cet appareil est un produit de classe I et possède une borne de mise à la terre. La source
d'alimentation principale doit être munie d'une prise de terre de sécurité installée aux
bornes du câblage d'entrée, sur le cordon d'alimentation ou le cordon de raccordement
fourni avec le produit. Lorsque cette protection semble avoir été endommagée,
débrancher le cordon d'alimentation jusqu'à ce que la mise à la terre ait été réparée.
Mise à la terre du câble de réseau local:
■ si votre réseau local s'étend sur une zone desservie par plus d'un système de
distribution de puissance, assurez-vous que les prises de terre de sécurité soient
convenablement interconnectées.
■ Les câbles de réseaux locaux peuvent occasionnellement être soumis à des
surtensions transitoires dangereuses (telles que la foudre ou des perturbations
dans le réseau d'alimentation public). Manipulez les composants métalliques du
réseau avec précautions.
Aucune pièce contenue à l'intérieur de ce produit ne peut être réparée par l'utilisateur.
Tout dépannage, réglage, entretien ou réparation devra être confié exclusivement à un
personnel qualifié.
Cet appareil ne comporte pas de commutateur principal ; la mise sous tension est
effectuée par branchement du cordon d'alimentation.
Safety and Regulatory Statements D-3
HP Hub-8TXE Installation and Reference Guide
Hinweise zur Sicherheit
Symbol für Dokumentationsverweis. Wenn das Produkt mit diesem Symbol markiert
ist, schlagen Sie bitte in der Produktdokumentation nach, um mehr Informationen
über das Produkt zu erhalten.
WARNING Symbol für Dokumentationsverweis. Wenn das Produkt mit diesem Symbol markiert
ist, schlagen Sie bitte in der Produktdokumentation nach, um mehr Informationen
über das Produkt zu erhalten.
CAUTION Symbol für Dokumentationsverweis. Wenn das Produkt mit diesem Symbol markiert
ist, schlagen Sie bitte in der Produktdokumentation nach, um mehr Informationen
über das Produkt zu erhalten.
Fahren Sie nach dem Hinweis WARNING oder CAUTION erst fort, nachdem Sie den
Gefahrenzustand verstanden und die entsprechenden Maßnahmen ergriffen haben.
Dies ist ein Gerät der Sicherheitsklasse I und verfügt über einen schützenden
Erdungsterminal. Der Betrieb des Geräts erfordert eine ununterbrochene
Sicherheitserdung von der Hauptstromquelle zu den Geräteingabeterminals, den
Netzkabeln oder dem mit Strom belieferten Netzkabelsatz voraus. Sobald Grund zur
Annahme besteht, daß der Schutz beeinträchtigt worden ist, das Netzkabel aus der
Wandsteckdose herausziehen, bis die Erdung wiederhergestellt ist.
Für LAN-Kabelerdung:
■ Wenn Ihr LAN ein Gebiet umfaßt, das von mehr als einem
Stromverteilungssystem beliefert wird, müssen Sie sich vergewissern, daß die
Sicherheitserdungen fest untereinander verbunden sind.
■ LAN-Kabel können gelegentlich gefährlichen Übergangsspannungen ausgesetzt
werden (beispielsweise durch Blitz oder Störungen in dem Starkstromnetz des
Elektrizitätswerks). Bei der Handhabung exponierter Metallbestandteile des
Netzwerkes Vorsicht walten lassen.
Dieses Gerät enthält innen keine durch den Benutzer zu wartenden Teile. Wartungs-,
Anpassungs-, Instandhaltungs- oder Reparaturarbeiten dürfen nur von geschultem
Bedienungspersonal durchgeführt werden.
Dieses Gerät hat keinen Netzschalter; es wird beim Anschließen des Netzkabels
eingeschaltet.
D-4 Safety and Regulatory Statements
HP Hub-8TXE Installation and Reference Guide
Considerazioni sulla sicurezza
Simbolo di riferimento alla documentazione. Se il prodotto è contrassegnato da questo
simbolo, fare riferimento alla documentazione sul prodotto per ulteriori informazioni su di
esso.
WARNING La dicitura WARNINGdenota un pericolo che può causare lesioni o morte.
CAUTION La dicituraCAUTION denota un pericolo che può danneggiare le attrezzature.
Non procedere oltre un avviso di WARNING o di CAUTIONprima di aver compreso le
condizioni di rischio e aver provveduto alle misure del caso.
Questo prodotto è omologato nella classe di sicurezza I ed ha un terminale protettivo di
collegamento a terra. Dev'essere installato un collegamento a terra di sicurezza, non
interrompibile che vada dalla fonte d'alimentazione principale ai terminali d'entrata, al
cavo d'alimentazione oppure al set cavo d'alimentazione fornito con il prodotto.
Ogniqualvolta vi sia probabilità di danneggiamento della protezione, disinserite il cavo
d'alimentazione fino a quando il collegaento a terra non sia stato ripristinato.
Per la messa a terra dei cavi LAN:
■ se la vostra LAN copre un'area servita da più di un sistema di distribuzione
elettrica, accertatevi che i collegamenti a terra di sicurezza siano ben collegati
fra loro;
■ i cavi LAN possono occasionalmente andare soggetti a pericolose tensioni
transitorie (ad esempio, provocate da lampi o disturbi nella griglia
d'alimentazione della società elettrica); siate cauti nel toccare parti esposte in
metallo della rete.
Nessun componente di questo prodotto può essere riparato dall'utente. Qualsiasi lavoro
di riparazione, messa a punto, manutenzione o assistenza va effettuato esclusivamente
da personale specializzato.
Questo apparato non possiede un commutatore principale; si mette scotto tensione
all'inserirsi il cavo d'alimentazione.
Safety and Regulatory Statements D-5
HP Hub-8TXE Installation and Reference Guide
Consideraciones sobre seguridad
Símbolo de referencia a la documentación. Si el producto va marcado con este
símbolo, consultar la documentación del producto a fin de obtener mayor información
sobre el producto.
WARNING Una WARNING en la documentación señala un riesgo que podría resultar en lesiones
o la muerte.
CAUTION Una CAUTION en la documentación señala un riesgo que podría resultar en averías al
equipo.
No proseguir después de un símbolo de WARNING o CAUTION hasta no haber
entendido las condiciones peligrosas y haber tomado las medidas apropiadas.
Este aparato se enmarca dentro de la clase I de seguridad y se encuentra protegido por
una borna de puesta a tierra. Es preciso que exista una puesta a tierra continua desde la
toma de alimentación eléctrica hasta las bornas de los cables de entrada del aparato, el
cable de alimentación o el juego de cable de alimentación suministrado. Si existe la
probabilidad de que la protección a tierra haya sufrido desperfectos, desenchufar el cable
de alimentación hasta haberse subsanado el problema.
Puesta a tierra del cable de la red local (LAN):
■ Si la LAN abarca un área cuyo suministro eléctrico proviene de más de una red
de distribución de electricidad, cerciorarse de que las puestas a tierra estén
conectadas entre sí de modo seguro.
■ Es posible que los cables de la LAN se vean sometidos de vez en cuando a
voltajes momentáneos que entrañen peligro (rayos o alteraciones en la red de
energía eléctrica). Manejar con precaución los componentes de metal de la
LAN que estén al descubierto.
Este aparato no contiene pieza alguna susceptible de reparación por parte del usuario.
Todas las reparaciones, ajustes o servicio de mantenimiento debe realizarlos solamente
el técnico.
Este producto no tiene interruptor de potencia; se activa cuando se enchufa el cable de
alimentación.
D-6 Safety and Regulatory Statements
HP Hub-8TXE Installation and Reference Guide
Safety Information (Japanese)
Safety and Regulatory Statements D-7
HP Hub-8TXE Installation and Reference Guide
Regulatory Statements
FCC Class A Statement (for U.S.A. Only)
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 interference to radio communications. Operation of this equipment
in a residential area may cause interference in which case the user will be required to
correct the interference at his own expense.
D-8 Safety and Regulatory Statements
HP Hub-8TXE Installation and Reference Guide
European Community
This equipment complies with ISO/IEC Guide 22 and EN55022 Class A with unshielded
cables and EN55022
Note
With unshielded cables this is a 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.
Canada
This product complies with Class A Canadian EMC requirements.
Safety and Regulatory Statements D-9
Appendix E:
Product Support Services
Hewlett-Packard offers support through the use of automated electronic services
including:
• World Wide Web
• HP Network Phone-In Support (NPS)
• HP FIRST FAX Retrieval Service
World Wide Web
http://www.hp.com/go/network_city
From this web site you can view information about HP’s complete networking product
line. If you have a growing network and need help designing it, download the Designing
HP AdvanceStack Workgroup Networks Guide or call 1-800-752-0900 to receive a copy
through mail.
HP FIRST Fax Retrieval Service
HP FIRST is an automated fax retrieval service that is available 24 hours a day, seven
days a week. HP FIRST provides information on the following topics:
• Product information
• Troubleshooting instructions
• Technical reviews and articles
• Configuration information
Product Support Services E-1
HP Hub-8TXE Installation and Reference Guide
To access HP FIRST, dial one of the following phone numbers:
Location Phone Number
U.S. and Canada Only Dial 1 (800) 333-1917 with y our f ax m achine or touch-tone
phone and press 1.
Outside the U.S. and Ca nada Dial 1 (208) 344-4809 fr om y our fa x m a chine a nd pres s 9. T o
receive a list of currently available documents, enter document
number 19941. The inf orm ation you requested w ill be sent to
you by re turn f ax .
Additional HP Support Services
In addition to the above services, you can purchase various HP telephone support
services which provide you expert HP technical assistance:
• Network Phone-In Support provides you support at an hourly rate. In the USA,
call 1-800-790-5544. In other countries, please contact your local HP
Response Center to see if this service is available in your country.
• HP SupportPack Comprehensive Network Support provides complete problem
resolution for medium to large interconnected local and wide area networks.
Contact your HP Authorized Reseller or the nearest HP Sales and Support
Office for more information.
• HP SupportPack LAN Support provides assistance with NOS usage, fault
isolation, and problem resolution for small to medium LANs, available in 5and 10-incident packages. Contact your HP Authorized Reseller or the nearest
HP Sales and Support Office for more information.
E-2 Product Support Services
Glossary
100BASE-TX
IEEE’s specifications for 100 Mbit/s Ethernet using twisted-pair cable (100W STP or
UTP). The maximum length of cable for a hub to end-node connection is 100 meters.
Cascade Port
An MDI RJ-45 port used to cascade compatible devices in a cascade configuration using
straight-through twisted-pair cable. To cascade two devices, either run a connection
from the cascade port on one device to an MDI-X port on the other device, or cascade
the two devices by running crossover cable between similar port types on both devices.
Collision
A condition in which two packets transmitted over a medium interfere with each other.
Their interference makes both unintelligible.
Configuration
The way to set up a computer, server, or local area network.
Connection
A logical binding between two or more users of an interconnection service.
Ethernet
A network communication system developed and standardized by DEC, Intel, and
Xerox, using baseband transmission, CSMA/CD access and logical bus topology, and
coaxial cable. The successor IEEE 802.3 standard provides for integration into the OSI
model and extends the physical layer and media with repeaters and implementations that
operate on fiber optics, broadband, and twisted-pair.
Glossary 1
HP Hub-8TXE Installation and Reference Guide
Fast Ethernet
100 Mbit/s network communication system based on Ethernet and the CSMA/CD access
method.
IEEE 802.3 Standard
Standard for the physical and electrical connections in local area networks developed by
the IEEE. The IEEE 802.3u standard covers these same issues for 100 Mbit/s networks.
LED
Light emitting diode on the front panel of the hub used for monitoring a hub or network
condition. An LED display corresponds to a hub condition.
Local Area Network (LAN)
A group of interconnected computers and support devices.
MDI Port (Medium Dependent Interface)
MDI is the IEEE standard for the twisted-pair interface. This RJ-45 port can be used
with straight-through cable to connect the hub to a network interconnection device, such
as another hub or a switch. Pin-out assignments are shown in Appendix B.
MDI-X Port (Medium Dependent Interface - Crossed)
This RJ-45 port, which crosses the receive and transmit signals internally, can be used
with straight-through cable to connect the hub to any device that has a standard network
interface (e.g., workstation, server, bridge or router). Pin-out assignments are shown in
Appendix B.
RJ-45 Connector
Most common terminator for twisted-pair wiring.
2 Glossary
HP Hub-8TXE Installation and Reference Guide
Shielded Twisted-Pair (STP)
Twisted-pair wire covered with an external aluminum-foil or woven-copper shield
designed to reduce excessive noise pick up or radiation. The STP cable refered to in
this manual is also sometimes called screened twisted-pair (ScTP). Its impedance is
W and has the same pin assignment as UTP. This cable should not be confused with
100
the older 150
W cable type designed by IBM.
Star Topology
Physical connections for this hub are limited to a star configuration (i.e., similar to a hub
and spoke arrangement). This topology also requires that only one path exists between
any two nodes, and that data transmitted by any node is concurrently available to all
other nodes within the same local network (i.e., immediate collision domain).
Unshielded Twisted-Pair (UTP)
Cable composed of two insulated wires twisted together to reduce electrical
interference; used in common telephone cord.
Glossary 3
Index
A
Automatic Partitioning • 1-2
Automatic Polarity Detection • 1-3
C
Cable Assignments • B-1
Configuring the Network • 3-1
Connecting Multiple Hubs • 3-2
Connecting the Hub System • 2-2
Connection
Verifying • 2-5
Crossover Cable • B-1
D
Distance Limit for Fast Ethernet Cabling • 2-3
E
I
Indicator Panel • 4-1
Installation Requirements • 2-1
Installing the System • 2-1
Introduction to Fast Ethernet • 1-1
J
Jabber Lock-up • 1-3
L
LED Indicators
Collision% • 4-3
Link • 4-4
Partition • 4-4
Power • 4-2
Traffic • 4-5
Utilization% • 4-3
Link Indicator • 2-5
Ethernet Ports • 4-5
F
Front Panel • 4-1
H
Hardware Description • 4-1
M
MDI Cascade Port • 3-2
N
Network Connection
MDI Cascade Port • 2-3
MDI-X Port • 2-2
Index 1
HP Hub-8TE Installation and Reference Guide
P
Port Assignments • B-1
Port Status Indicators • 4-4
Power Socket • 4-6
Product Features • 1-2
Product Support Services • E-1
Providing Power to the Hub • 2-4
R
Rear Panel • 4-6
Regulatory Information • D-1, D-8
S
Safety Information • D-1, D-2
Specifications
Certification • C-1
Interfaces • C-1
Media Supported • C-1
Power System • C-1
Standards Conformance • C-1
Stand-alone Configuration • 3-1
V
Verifying Connections • 2-5
Verifying Port Status • 2-4
Verifying System Operation • 2-5
T
Troubleshooting • 4-5
Configuration • A-3
Hub Indicators • A-1
Installation • A-2
Power and Cooling • A-2
Twisted-Pair Cable
Category 5 • 2-2, A-2
2 Index
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