Accton Technology Switch FAST ETHERHUB 12S User Manual

Fast EtherHub-12s  
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Copyright (c) 1997 by Accton Technology Corporation. All rights reserved.  
No part of this document may be copied or reproduced in any form or by any means without the  
prior written consent of Accton Technology Corporation.  
Accton makes no warranties with respect to this documentation and disclaims any implied  
warranties of merchantability, quality, or fitness for any particular purpose. The information in this  
document is subject to change without notice. Accton reserves the right to make revisions to this  
publication without obligation to notify any person or entity of any such changes.  
Before operating this product, please review the statements on electomagnetic emission  
interference and safety compliance in Appendix D.  
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No. 1 Creation Road III,  
86$ꢀ+HDGTXDUWHUV  
1962 Zanker Road  
Science-based Industrial Park  
Hsinchu 300, Taiwan, R.O.C.  
Phone: 886-3-5770-270  
FAX: 886-3-5770-267  
BBS: 886-3-5770-654  
San Jose, CA 95112  
Phone: 408-452-8900  
FAX: 408-452-8988  
BBS: 408-452-8828  
FAST FAX: 408-452-8811  
Internet: [email protected]  
Accton, EtherHub and SmartWatch are trademarks or registered trademarks of Accton Technology  
Corporation. Other trademarks or brand names mentioned herein are trademarks or registered  
trademarks of their respective companies.  
EH3012-TX  
150114-101  
E0197-R02  
 
Package Contents  
Carefully unpack the contents of the package and verify them against the  
checklist given below.  
Package Checklist  
æ Fast EtherHub-12s (Model No. EH3012-TX)  
æ AC power cord (optional)  
æ Four rubber foot pads  
æ Installation manual  
æ Warranty registration card  
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.  
To qualify for product updates and product warranty registration, fill in the  
Owner Registration Card and return it to Accton Technology Corporation.  
Package Contents  
i
 
Quick Installation  
The Fast EtherHub-12s is a Class II repeater. It contains 12 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 Fast EtherHub-12s.  
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), or install them in an standard EIA 19-inch rack.  
4. Connect any devices that use a standard network interface to the RJ-45  
(MDI-X) station ports (e.g., a workstation, server or router). Use 100W  
Category 5 STP or 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.  
To cascade to another hub or switch, run straight-through twisted-pair cable  
from the (12MDI) daisy-chain port on this hub to any (MDI-X) station port  
on the other device (or vice versa). Refer to Figure 3.2. If necessary, you  
can also cascade between two station ports using crossover cable. However,  
be sure not to exceed the maximum length between end nodes. Assuming  
that the maximum cable length is used for end-node connections (i.e., 100  
meters), then the inter-hub cabling should be limited to 5 meters. However,  
if you need to extend this length of inter-hub cabling beyond 5 meters, then  
Quick Installation  
iii  
 
Fast EtherHub-12s User’s Guide  
first calculate the maximum length permitted between each pair of end nodes  
as described in Chapter 2 under the section on Precise Cable Length Budgeting.  
5. 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 Fast EtherHub, 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 Accton’s Fast EtherHub-12s. 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 a Fast EtherHub 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  
Accton’s Fast EtherHub-12s......................................................................................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 Station Port ................................................2-2  
Making a Connection via the MDI Daisy-Chain Port...........................................2-3  
Simplified Cable Length Constraints..............................................................2-4  
Precise Cable Length Budgeting.....................................................................2-4  
Providing Power to the EtherHub..............................................................................2-5  
Verifying Port Status.................................................................................................2-6  
Verifying System Operation......................................................................................2-6  
Chapter 3: Configuring the Network...................................... 3-1  
Stand-Alone...............................................................................................................3-1  
Connecting Multiple Hubs ........................................................................................3-1  
Using the RJ-45 Daisy-Chain Port........................................................................3-2  
Precies Guidelines for Configuring Multiple Hubs ..............................................3-3  
Chapter 4: Hardware Reference............................................. 4-1  
Front Panel ...............................................................................................................4-1  
Indicators..............................................................................................................4-1  
Fan Alert.........................................................................................................4-2  
Power Status ...................................................................................................4-2  
Statistical Display for System Performance....................................................4-3  
Port Status Display..........................................................................................4-4  
RJ-45 Ethernet Ports.............................................................................................4-5  
Rear Panel ...............................................................................................................4-6  
Power Socket........................................................................................................4-6  
Contents  
vii  
 
Fast EtherHub-12s User’s 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  
Appendix B: Port and Cable Assignments............................. B-1  
RJ-45 Port ...............................................................................................................B-1  
Appendix C: Specifications.................................................... C-1  
Product Specifications...............................................................................................C-1  
Appendix D: Regulatory Standards Compliance.................. D-1  
EMI Certification ......................................................................................................D-1  
FCC Class B Certification....................................................................................D-1  
Voluntary Control Council for Interference (VCCI-2).........................................D-2  
European Community Immunity Requirements....................................................D-3  
CE Mark Declaration of Conformance (for EMI and Safety)...............................D-3  
Safety Compliance.....................................................................................................D-4  
Underwriters Laboratories Inc..............................................................................D-4  
Sicherheitshinweise..............................................................................................D-5  
Appendix E: Product Support Services ................................ E-1  
Product Registration..................................................................................................E-1  
Problem Report .........................................................................................................E-1  
Hardware Repair Service...........................................................................................E-1  
Bulletin Board Service (BBS) ...................................................................................E-2  
Interactive Fast Fax (U.S.A. office) ..........................................................................E-2  
Technical Support .....................................................................................................E-3  
viii  
Contents  
 
Fast EtherHub-12s User’s Guide  
Limited Warranty .......................................................................................................E-4  
Customer Remedies..............................................................................................E-4  
Return Process......................................................................................................E-5  
Accton Offices...........................................................................................................E-6  
Ordering Information ................................................................................................E-6  
Glossary  
Index  
List of Figures  
Figure 3.1 Stand-Alone Configuration ....................................................................3-1  
Figure 3.2 Multiple Hub Configuration Using the Daisy-Chain Port......................3-2  
Figure 3.3 Cabling Limits for Multiple Hub Configuration.....................................3-4  
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 Mbps 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 Mbps  
Ethernet has become a serious bottleneck.  
With the recent flood of choices for upgrading media bandwidth, 100 Mbps  
Fast Ethernet has become the most popular choice 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 Mbps Ethernet environment with no need for  
protocol translation or changes to network software.  
Accton’s Fast EtherHub-12s  
The Fast EtherHub-12s includes 12 100BASE-TX Ethernet ports. It provides a  
friendly design that simplifies installation and network troubleshooting. The  
SmartWatchTM indicator panel includes Utilization and Collision rate LEDs, as  
well as Partition, Link and Traffic LEDs to ease network management.  
The Fast EtherHub-12s 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  
 
Fast EtherHub-12s User’s Guide  
Basic Features  
Transmits data at 100 Mbps for demanding applications  
Conforms to the IEEE 802.3u repeater specification for 100BASE-TX  
Provides 12 RJ-45 100BASE-TX station ports (using MDI-X wiring)  
Port 12 can serve as an MDI-X station 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 100Category 5 shielded or unshielded cable (STP or UTP)  
Friendly design that monitors network utilization, collisions, link and port  
partition status  
LED indicator panel including 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  
An Alert LED that shows if the fan has failed  
The Fast EtherHub-12s also supports the following basic system safeguards:  
This hub features automatic partitioning and reconnection, jabber lockup  
protection, and automatic polarity detection for network cabling.  
1-2  
Product Overview  
 
Fast EtherHub-12s User’s Guide  
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.  
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 Fast EtherHub-12s, estab-  
lishing network connections, and configuring the system. You may install this  
hub on any level surface (e.g., a table or shelf) or in a standard 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 240 VAC (± 10%) at 50 to 60 Hz (± 3Hz). The  
hub’s power supply automatically adjusts to the input voltage level.  
The EtherHub 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  
Installing the System  
2-1  
 
Fast EtherHub-12s User’s Guide  
Connecting the Hub System  
This hub is a Fast Ethernet repeater for 100BASE-TX networks. The  
EtherHub-12s has 12 RJ-45 station ports, of which Port 12 can serve as either a  
station port or a daisy-chain port (depending on the port’s switch setting). The  
station ports allow you to make connections to devices such as a workstation,  
server or router. You can also cascade to another compatible hub or switch by  
connecting an MDI port on one device (e.g., port 12MDI on this hub) to an  
MDI-X 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 Station Port  
You can connect an RJ-45 station 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 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 station ports. You also need to prepare  
straight-through shielded or unshielded twisted-pair cables with RJ-45 plugs  
at both ends. Use 100W Category 5 cable for all connections.  
2. Connect one end of the cable to the RJ-45 port of the network interface card  
(or comparable port type) on the device you are attaching to the hub, and the  
other end to any available (MDI-X) station 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 12 nodes.  
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.  
I
1. When connecting to station Port 12, set the port selection switch to MDI-X.  
2. Make sure each twisted-pair cable does not exceed 100 meters.  
Notes:  
2-2  
Installing the System  
 
Fast EtherHub-12s User’s Guide  
Making a Connection via the MDI Daisy-Chain Port  
1. To make a direct connection to another compatible repeater or switch, use the  
12MDI daisy-chain port. When connecting to this port, remember to set the  
port selection switch MDI.  
2. Prepare straight-through shielded or unshielded twisted-pair cables with  
RJ-45 plugs at both ends. Use 100W Category 5 cable for all connections.  
Connect one end of the cable to Port 12MDI on this hub, and the other end to  
a standard MDI-X station 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.  
1. When connecting to Port 12MDI, set the port selection switch to MDI.  
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 a station port on this hub to a crossover port on  
another device. However, if you must connect to another device via station  
ports at both ends of the cable, use crossover cabling.  
Notes:  
Distance Limit for Fast Ethernet Cabling  
There are two common ways to calculate maximum cable length. The first  
way, which is refered to as the “Simplified Cable Length Constraints” method  
assumes that the maximum permissible cable length is used to connect various  
end-node devices (such as workstations or servers) to the hub. A more careful  
method of calculating maximum cable length, referred to as the “Precise Length  
Budgeting” method, requires you to measure the exact cable length for each  
pair of nodes that need to communicate, and to provide the signal delay time for  
each hub in your system. Both of these methods are described in this section.  
Installing the System  
2-3  
 
Fast EtherHub-12s User’s Guide  
Simplified Cable Length Constraints  
The Fast EtherHub-12s is a Class II repeater. IEEE recommends that Class II  
hubs be limited to a cascade of two hubs. The simplest rule is that workstation  
connections be limited to 100 meters for twisted-pair cabling, and that interhub  
cabling be limited to 5 meters. If you are stacking hubs in a wiring closet, this  
is good advise. When a hub is located in central wiring closet, connections to  
end users tend to be very long. Using these assumptions, then maximum cable  
lengths depend on the device type you want to attach to the hub, as shown in  
the following table:  
cable type  
workstation  
another hub  
switch  
twisted-pair  
100 meters  
5 meters  
100 meters  
When connecting to another hub, traffic is confined to a single collision  
domain. However, when connecting to a collapsed backbone (e.g., a switch or  
router), the collision domain is broken up, enabling the use of longer cable  
lengths as illustrated in the preceeding table.  
Precise Cable Length Budgeting  
If you plan on installing a network for a small office, it may not be convenient  
to place hubs within 5 meters of each other, and then run up to 100 meters of  
cabling for each end user. This kind of installation can be very messy and  
wastes a lot of cabling. Depending on how your users are spread out, it may be  
more convenient to run a longer length of inter-hub cabling (say 50 meters or  
more), and then run shorter lengths of cable from each hub to the end users.  
Depending on the inherent delay in the hub and the maximum cable lengths  
required, it may even be possible to cascade up to three Fast Ethernet hubs.  
However, when setting up these kinds of distributed cascades, you have to be  
very careful in calculating the maximum length for each node pair. All end-  
node devices (e.g., workstations or servers) must be within 100 meters of the  
2-4  
Installing the System  
 
Fast EtherHub-12s User’s Guide  
connected hub when using twisted-pair cabling. However, when linking one or  
more Fast Ethernet repeaters together (i.e., in the same collision domain), the  
overall length of cable used between any two nodes should not exceed the  
limits outlined in the IEEE 802.3u standard. In precise terms, the maximum  
length of cabling that can be run from end-node to end-node is  
367m S(repeater equivalent length) + S(length of CAT-5 twisted-pair cable)  
This 100BASE-TX Class II device has an inherent repeater delay of 90 bit time  
or 80 meters of twisted-pair cable. Taking a daisy chain of two hubs connected  
via twisted-pair cabling for an example, the maximum length from node to node  
is 367m - (2 x 80m) = 207m. Therefore, if both node A and B are linked to  
separate repeaters in a two hub system, each using 100 meters of cable to connect  
to their respective hub, then the inter-hub cabling will be limited to 5 meters  
(i.e., 207m - 2x100m = 7m, which is then reduced to 5 meters according to a  
common wiring rule).  
Providing Power to the EtherHub  
1. Power on the hub by plugging the power cord into the power socket at the  
rear of the EtherHub (see Figure 4-2), 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.  
The unit supports a “hot remove” feature which permits you to connect/  
disconnect cables without powering off the hub and without disrupting the  
operation of attached devices.  
F
Installing the System  
2-5  
 
Fast EtherHub-12s User’s Guide  
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.  
Indicates traffic traversing the port.  
Traffic  
Partition Indicates that the port has been isolated from the hub due to  
excessive errors.  
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. If you are using bit budget calculations to determine maximum  
cable lengths, then be sure you have not exceeded the maximum cable length  
calculated for any potential node pair.  
2-6  
Installing the System  
 
Fast EtherHub-12s User’s Guide  
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 Troubleshooting in Appendix A.  
Installing the System  
2-7  
 
Chapter 3: Configuring the Network  
The Fast EtherHub-12s 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 EtherHub 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  
Connecting Multiple Hubs  
In a multiple hub configuration, the maximum overall segment length for inter-  
hub cabling depends on many factors, including the length of the cables used to  
connect station nodes to the hub system and the number of hubs you cascade  
together. You can use simple calculations to determine the maximum network  
diameter or the stricter guidelines outlined by IEEE 802.3u standard.  
Configuring the Network  
3-1  
 
Fast EtherHub-12s User’s Guide  
Using the RJ-45 Daisy-Chain Port  
You can easily connect to another hub via the MDI daisy-chain port (Port 12).  
When using Simplied Cable Length Constraints as described in Chapter 2, the inter-  
hub cable length is 5 meters. Figure 3-2 shows a sample configuration.  
Figure 3-2 Multiple Hub Configuration Using the Daisy-Chain Port  
3-2  
Configuring the Network  
 
Fast EtherHub-12s User’s Guide  
Precise Guidelines for Configuring Multiple Hubs  
A detailed formula for calculating maximum cable length was provided in the  
section on Precise Cable Length Budgeting in Chapter 2. This formula stated that the  
maximum length of cabling that can be run from end-node to end-node is:  
367m S(repeater equivalent length) + S(length of CAT-5 twisted-pair cable)  
For the daisy chain of three hubs shown in Figure 3-3, communications must  
be supported for node pairs AB and AC. In this case, first determine the  
limitations on cable length found on the longest path (i.e., the path with the  
longest delay time).  
Remember that this Class II device has an inherent repeater delay of 90 bit time  
or 80 meters of twisted-pair cable. Therefore, if node A and B are linked to  
repeaters 1 and 3 respectively (each using 50 meters of twisted-pair cable), then  
the maximum length from node A to B is 367m - (3 x 80m) = 127m and the  
total inter-hub cabling will be limited to 27 meters (i.e., 127m - 2x50m = 27m).  
Therefore, if you use 15 meters of twisted-pair cable to connect hubs 1 and 2,  
then 12 meters of cable can be used to connect hubs 2 and 3.  
Then, if node A and C are linked to adjacent repeaters 1 and 2 in this system,  
the maximum length of twisted-pair cable that can be used to connect node C to  
hub 2 is 367m - 2*80m - 50m - 15m = 142 meters. However, the maximum  
length for any twisted-pair connection cannot exceed 100 meters.  
Configuring the Network  
3-3  
 
Fast EtherHub-12s User’s Guide  
Figure 3-3 Cabling Limits for Multiple Hub Configuration  
Notes:  
1. The maximum length for each cable must be determined by calculations for the  
longest path (i.e., node-to-node connection) that passes through that segment.  
2. To control the number of hubs in a path, we recommend that one hub be used to  
connect to several other hubs. Make sure there is only one path between any two  
stations on the network.  
3. If you need to connect network devices over a long distance, use a switching hub  
or router to split the network up into two or more collision domains. For detailed  
information on purchasing the required equipment, contact your local distributor or  
Accton representative for support.  
3-4  
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 Fast  
EtherHub-12s. For easier management and control of the hub, familiarize  
yourself with the display indicators and ports.  
Front Panel  
There are 12 RJ-45 MDI-X station ports and 1 RJ-45 MDI daisy-chain port on  
the front panel. Moreover, the system indicators provide a simple interface for  
monitoring the hub. The front panel includes an alert indicator to show if the  
fan has failed, 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  
Indicators  
The SmartWatch indicator panel simplifies monitoring of various network  
conditions by providing LEDs that indicate the status of each station 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  
 
Fast EtherHub-12s User’s Guide  
The front panel array provides indicators that show the utilization of network  
bandwidth and indicate the status of port connections. It includes port status  
indicators and a statistical display for network traffic as shown below.  
Figure 4.2 Indicators  
Fan Alert  
Color:  
Label:  
Red  
Alert  
Function: Fan status  
Condition  
Indication  
ON  
OFF  
The unit’s fan has failed. (Call for service)  
The unit’s fan is functioning properly.  
Power Status  
Color:  
Label:  
Green  
Power  
Function: Power indicator  
Condition  
ON  
Indication  
Unit is receiving power.  
OFF  
Power is disconnected, no power received.  
4-2  
Hardware Reference  
 
Fast EtherHub-12s User’s 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 utilization.  
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 Mbps 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 attempt to transmit data  
simultaneously on the network. When a collision occurs, devices pause and then  
re-transmit after a pseudo-random wait period. Because wait periods differ among  
devices, successive collisions become increasingly 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 correspond-  
ing LED lights up. For example, if packet 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  
 
Fast EtherHub-12s User’s 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 Status  
Color:  
Label:  
Red  
Partition  
Function: Shows if the port has been isolated from the network  
Condition  
ON  
OFF  
Indication  
Indicates port has been partitioned due to an abnormal network condition.  
Port is in good condition.  
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 (RED light). Otherwise, this LED should be OFF (unlit).  
1. 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.  
Notes:  
Link Status  
Color:  
Label:  
Green  
Link  
Function: Indicates a valid network connection associated with the port.  
Condition  
ON  
OFF  
Indication  
Indicates a valid link has been established on this port.  
No valid link has been established on this port.  
4-4  
Hardware Reference  
 
Fast EtherHub-12s User’s Guide  
Troubleshooting: If the Link LED does not light up when a device is connected to its corre-  
sponding port, check that both the hub and connected device are powered on. Be sure  
the cable length for all devices connected to the hub are within the limits described  
under Distance Limit for Fast Ethernet Cabling in Chapter 2. As a general rule, be sure that  
none of your twisted-pair cables exceed 100 meters. You should have standard, straight-  
through cables and not crossover or other specialized cables.  
Incoming Traffic  
Color:  
Label:  
Green  
Traffic  
Function: Indicates traffic entering the port.  
Condition  
Indication  
BLINKING  
Indicates the port is receiving packets; blinking is  
proportional to the traffic entering the port.  
No packets are being received by this port.  
OFF  
RJ-45 Ethernet Ports  
This hub includes 12 Fast Ethernet station ports; of which Port 12 can also  
serve as a daisy-chain port. Use straight-through twisted-pair cable to connect  
the shielded MDI-X station ports to a workstation or server; or to connect the  
MDI port to another network interconnection device, such as a hub or switch.  
When using Port 12, remember to set the selection switch to MDI-X when  
connecting to a workstation, or to MDI when cascading to another hub or  
switch. Remember to use 100Wcategory 5 straight-through twisted-pair cable  
(STP or UTP) for all standard connections.  
Note: If you must cascade between MDI-X station ports on two hubs, then use  
crossover cable.  
Hardware Reference  
4-5  
 
Fast EtherHub-12s User’s 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 to 240V 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 EtherHub 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 not light up.  
Cause:  
Defective power outlet, power cord, or internal power supply.  
Solution: Have your unit’s power supply or Power LED replaced. Ask for  
dealer assistance.  
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 indicator remains unlit after making a connection.  
Cause:  
Workstation’s network adapter, the cable, or the hub port is defective.  
Solution: Verify that the hub and attached device are powered on. Be sure the  
cable is plugged into both the hub and corresponding device. Verify  
that the proper cable type is used (Chapter 2), and that its length  
does not exceed 100 meters. Check the adapter on the attached  
device and cable connections for possible defects. Replace the  
defective 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 Accton distributor for assistance.  
Troubleshooting  
A-1  
 
Fast EtherHub-12s User’s 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 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 Accton distributor 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 100W 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 station 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 daisy-chain port is not available.  
A-2  
Troubleshooting  
 
Fast EtherHub-12s User’s Guide  
External Adapters  
Make sure the network interface hardware and software drivers for the attached  
devices are function properly. Check the adapter cards 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 recommendations.  
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 Accton  
distributor for further assistance. (Refer to Appendix E.)  
Troubleshooting  
A-3  
 
Appendix B:  
Port and Cable Assignments  
RJ-45 Port  
Figure B-1 RJ-45 Connector (on the Hub Side)  
MDI-X Assignment  
(Station Port 1 ~ 12)  
Input Receive Data +  
Input Receive Data -  
Output Transmit Data + Input Receive Data +  
Output Transmit Data -  
MDI Assignment  
(Cascade Port 12)  
Output Transmit Data +  
Output Transmit Data -  
Pin  
1
2
3
6
Input Receive Data -  
Not Used  
4,5,7,8 Not Used  
Table B-1 RJ-45 Pin Assignments  
Schematics for both straight and crossover twisted-pair cable are shown below.  
Straight-Through  
(Adapter)  
Crossover  
(Hub)  
1 IRD+  
2 IRD-  
3 OTD+  
6 OTD-  
(Hub)  
(Hub)  
1 OTD+  
2 OTD-  
3 IRD+  
6 IRD-  
1 IRD+  
2 IRD-  
3 OTD+  
6 OTD-  
1 IRD+  
2 IRD-  
3 OTD+  
6 OTD-  
Cable and Port Assignments  
B-1  
 
Appendix C: Product Specifications  
Transmission Technique  
Topology  
Baseband  
Star or Tree  
Access Method  
CSMA/CD, 100Mbps  
Standards Conformance  
Media Supported  
IEEE 802.3u 100BASE-TX Class II Repeater  
Unshielded or shielded twisted-pair cable  
(100W Category 5 STP/UTP)  
12 RJ-45 MDI-X station ports, Port 12 can be switched to  
function as an MDI-X station port or MDI daisy-chain port  
100 meters maximum using category 5 STP or UTP cable  
Interfaces  
Hub-to-Workstation Distance  
Daisy-Chain Distance (2 hubs) 5 meters (assuming 100 meters from each node to hub)  
Dimensions  
440 mm x 192 mm x 43 mm  
(17.32"x 7.56" x 1.69")  
Power Input  
Power Consumption  
Temperature  
Humidity  
Certification  
Emissions  
100 to 240 VAC (10%), 50 to 60 Hz (3%)  
2 Amp max. @ 100 VAC, 1 Amp @ 220 VAC  
0°C to 40°C (Standard Operating)  
5% to 95% (Noncondensing)  
CE Mark  
FCC Class B, VCCI Class 2, CISPR 22 Class B  
IEC 1000-4-2,3,4,6  
Immunity  
Safety  
UL, CSA, TÜV/GS  
Product Specifications  
C-1  
 
Appendix D:  
Regulatory Standards Compliance  
EMI Certification  
FCC Class B Certification  
Accton Technology Corporation  
Model Numbers: EH3012-TX  
FCC ID: HED3012EHLCT-TX  
This device complies with Part 15 of the FCC Rules. Operation is subject to the  
following conditions:  
1. This device may not cause harmful interference, and  
2. This device must accept any interference received, including interference that  
may cause undesired operation.  
Warning! This equipment has been tested and found to comply with the limits for a Class B digital  
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable  
protection against harmful interference in a residential installation. This equipment generates, uses  
and can radiate radio frequency energy and, if not installed and used in accordance with the  
instructions, may cause harmful interference to radio communications. However, there is no  
guarantee that interference will not occur in a particular installation. If this equipment does cause  
harmful interference to radio or television reception, which can be determined by turning the  
equipment off and on, the user is encouraged to try to correct the interference by one or more of  
the following measures:  
Reorient or relocate the receiving antenna  
Increase the separation between the equipment and receiver  
Connect the equipment into an outlet on a circuit different from the one which the receiver is  
connected to  
Consult the dealer or an experienced radio/TV technician for help  
You are cautioned that changes or modifications not expressly approved by the party  
responsible for compliance could void your authority to operate the equipment.  
Regulatory Standards Compliance  
D-1  
 
Fast EtherHub-12s User’s Guide  
Warnings 1. Wear an anti-static wrist strap or take other suitable measures to prevent  
electrostatic discharge whenever handling this equipment.  
2. When connecting this hub to a power outlet, connect the field ground lead  
on the tri-pole power plug to a valid earth ground line to prevent electrical  
hazards.  
You may find the following booklet prepared by the Federal Communications  
Commission helpful:  
The Interference Handbook  
This booklet is available from the U.S. Government Printing Office. Washington, D.C.  
20402. Stock No. 004-000-00345-4.  
Note: In order to maintain compliance with the limits of a Class B digital device, Accton  
requires that you use a quality interface cable when connecting to this device. Changes  
or modifications not expressly approved by Accton could void the user’s authority to  
operate this equipment. Suggested cable type is:  
Twisted-pair for RJ-45 connections: 100WCategory 5 STP or UTP  
Voluntary Control Council for Interference (VCCI-2)  
This equipment is in the 2nd Class category and conforms to the standards set by the  
Voluntary Control Council for Interference by Data Processing Equipment and  
Electronic Office Machines aimed at preventing radio interference in residential areas.  
2nd Class category equipment is qualified to be used in or near residential areas.  
However, if this equipment is placed near a functioning radio or telephone, data errors  
may result.  
D-2  
Regulatory Standards Compliance  
 
Fast EtherHub-12s User’s Guide  
Read the instructions for correct handling.  
European Community Immunity Requirements  
This unit was tested and found to comply with the Class B limits of EN55022 (CISPR  
22) and the immunity requirements of EN50082-1.  
CE Mark Declaration of Conformance (for EMI and Safety)  
This is to certify that this product complies with ISO/IEC Guide 22 and EN45014.  
It conforms to the following specifications:  
EMC: EN55022(1988)/CISPR-22(1985)  
class B  
IEC 1000-4-2(1995)/IEC 801-2(1991) 4kV CD, 8kV AD  
IEC 1000-4-3(1995)/IEC 801-3(1984) 3V/m  
IEC 1000-4-4(1995)/IEC 801-4(1988) 1kV - (power line), 0.5kV - (signal line)  
IEC 1000-4-6(1995)  
3Vrms  
This product complies with the requirements of the Low Voltage Directive 73/23/EEC  
and the EMC Directive 89/336/EEC.  
Warning!  
Do not plug a phone jack connector in the RJ-45 port. This may damage the hub.  
Les raccordeurs ne sont pas utilisé pour le système téléphonique!  
Regulatory Standards Compliance  
D-3  
 
Fast EtherHub-12s User’s Guide  
Safety Compliance  
Underwriters Laboratories Inc.  
Important! Before making connections, make sure you have the correct Cord Set.  
Check it (read the label on the cable) against the following specification list.  
Operating Voltage  
120 Volts  
Cord Set Specifications  
UL Listed/CSA Certified Cord Set  
Minimum 18 AWG  
Type SVT or SJT three conductor cord  
Maximum length of 15 feet  
Parallel blade, grounding type attachment plug rated 15A, 125V  
240 Volts (For North America) UL Listed/CSA Certified Cord Set  
Minimum 18 AWG  
Type SVT or SJT three conductor cord  
Maximum length of 15 feet  
Tandem blade, grounding type attachment plug rated 15A, 125V  
240 Volts (For Europe only)  
Cord Set with H05VV-F cord having three conductors with minimum  
diameter of 0.75 mm  
2
IEC-320 receptacle  
Male plug rated 6A, 250V  
The unit will automatically select the setting that matches the input voltage connected.  
Therefore, no additional adjustments are necessary when connecting it to any input  
voltage within the range marked on the rear panel.  
D-4  
Regulatory Standards Compliance  
 
Fast EtherHub-12s User’s Guide  
Sicherheitshinweise  
1. Die Steckdose muß sich in der Nähe des Gerätes befinden und leicht zugänglich sein.  
2. Zum Reinigen den Stecker aus der Steckdose ziehen. Beim Reinigen keine  
Flüssigreiniger oder Sprays verwenden, sondern ein angefeuchtetes Tuch.  
3. Das produkt gerät nicht in Naßräume oder in der Nähe von  
Wasser benutzen, wie z.B. Badezimmer, Schwimmbad, Spülbecken usw.. Das Eindringen  
von Wasser kann zur Zerstörung des Gerätes führen.  
4. Das produkt gerät nicht auf einer unstabilen Unterlage, wie z.B. Rollwagen, Gestell usw.,  
aufstellen. Es könnte herunterfallen und Verletzungen oder Beschädigungen von Mensch  
und Gerät verursachen.  
5. Die Belüftungsöffnungen nicht blockieren oder auf falscher Ober-fläche, wie Bett,  
Sofa usw., stellen. Durch die Blockierung kann es zur Zerstörung des Gerätes durch  
Überhitzung kommen.  
6. Versuchen Sie niemals dieses Gerät selbst zu warten, da beim Öffnen oder Abnehmen  
des Gehäuses die Gefahr eines elektrischen Schlages besteht.  
7. Keine Gegenstände auf das Anschlußkabel stellen, damit es nicht durch scharfe Kanten  
zerstört werden kann.  
8. Keinerlei Gegenstände durch die Öffungen in das Gerät stecken, da es dadurch sonst  
zu Kurzschlässen kommen kann.  
9. Bei Störungen des Gerätes den Wartungsdienst verständigen.  
10. Bei Reperaturen dürfen nur Orginalersatzteile oder Bauteile mit gleichen  
Eigenschaften verwendet werden. Andere Bauteile können Feuer, elektrischen Schlag  
oder andere Gefahren verursachen.  
11. Nach Beendigung von Wartungsarbeiten oder Reperaturen durch den Kundendienst  
sollte die Sicherheitsprüfung durchgeführt werden.  
12. Bei längerem Stillstand des Gerätes, ist diese von der Versorgungs- spannung zu  
trennen. Dies verhindert eine Besch÷digung des Gerätes durch eine Überspannung in  
der Zuleitung.  
13. Der arbeitsplatzbezogene Lärmschutzpegel nach DIN 45 635 ist kleiner 70dB (A).  
Regulatory Standards Compliance  
D-5  
 
Appendix E:  
Product Support Services  
Product Registration  
Fill in the Owner Registration Card and mail it to Accton Technology Corporation.  
Accton will keep your record and inform you of any new Accton unit developments.  
Problem Report  
If problems occur during unit operation, please check the adapter configuration settings,  
cables, connectors, network terminators, hardware compatibility and other network  
components.  
Write a description of the problem, including what problems occurred, when they  
occurred, duration of the problems, the unit number, serial number, hardware, software  
and the DOS version that you are using. Then contact your dealer or Accton Technology  
Corporation for assistance.  
Hardware Repair Service  
You must get an RMA (Return Materials Authorization) number before returning any  
hardware for repair. To obtain this number please inform Accton of your company  
name, address, unit name and model number, contact person, telephone number, and a  
problem description list. If your unit is under repair warranty you must also give your  
purchase date. Carefully pack your hardware. If possible, use the original carton. Mark  
the RMA number on the carton and send it to your dealer.  
Product Support Services  
E-1  
 
Fast EtherHub-12s User’s Guide  
After repair, Accton will inform you of the date of delivery and the exact amount due.  
Please send the payment by T/T (Telegram Transfer), and Accton will send you the  
fixed component after receiving payment. With or without warranty, if the hardware is  
found to be free of defects, you will only be charged for testing and handling.  
Bulletin Board Service (BBS)  
In countries other than the U.S., call 886-3-5770-654 to reach Accton Taiwan’s  
modem line. Modems with 14400 through 2400 baud are supported. Choose 8 data  
bits, 1 stop bit and no parity. Standard VT100 terminal emulation is supported  
In the United States, call 408-452-8828 to reach the Accton USA’s BBS line.  
Modems with 14400 through 2400 baud are supported. Choose 8 data bits, 1 stop bit  
and none parity. Standard VT100 terminal emulation is supported.  
Interactive Fast Fax (U.S.A. office)  
Printed technical documentation can be FAX’ed to your FAX machine, 24-hours a day.  
Call 408-452-8811 to reach Accton’s interactive Fast FAX service. You will need a  
Touch-Tone phone and a FAX machine (or equivalent). Choose document 911 for a  
listing of technical bulletins.  
E-2  
Product Support Services  
 
Fast EtherHub-12s User’s Guide  
Technical Support  
Your dealer or installer is the person who understands your network and Accton units.  
If neither is available to help you, Accton technical support engineers are available by  
FAX, mail or phone.  
Send your technical questions by FAX to:  
International Headquarters: 886-3-5770-267  
USA Headquarters: 408-452-8988  
To obtain software upgrades connect via ftp to ftp.accton.com.tw  
Send your technical questions by email to [email protected]  
Mail your technical questions to:  
International Headquarters  
USA Headquarters  
Accton Technology Corporation Accton Technology  
Attn: Technical Support  
Corporation  
No. 1 Creation Road III  
Science-based Industrial Park  
Hsinchu 300, Taiwan, R.O.C.  
Attn: Technical Support  
1962 Zanker Road,  
San Jose, CA 95112, U.S.A.  
During local business hours, call:  
International Headquarters  
(Monday through Friday,  
8 am to 6 p.m.):  
USA Headquarters  
(Monday through Friday,  
7 am to 5 p.m. Pacific Time):  
408-452-8900 or 800-926-9288  
886-3-5770-270  
Product Support Services  
E-3  
 
Fast EtherHub-12s User’s Guide  
Limited Warranty  
Accton warrants to the original owner that the product delivered in this package will be free from  
defects in material and workmanship for the lifetime of the product. For the warranty to apply, you  
must register your purchase by returning the registration card indicating the date of purchase and  
including proof of purchase. There will be a minimal charge to replace consumable components, such  
as fuses, power transformers, and mechanical cooling devices. The warranty does not cover the product  
if it is damaged in the process of being installed. Accton recommends that you have the company from  
whom you purchased this product install it.  
THE ABOVE WARRANTY IS IN LIEU OF ANY OTHER WARRANTY, WHETHER EXPRESS,  
IMPLIED OR STATUTORY, INCLUDING BUT NOT LIMITED TO ANY WARRANTY OF  
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR ANY WARRANTY  
ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE. ACCTON SHALL NOT BE  
LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. ACCTON NEITHER ASSUMES  
NOR AUTHORIZES ANY PERSON TO ASSUME FOR IT ANY OTHER LIABILITY.  
Customer Remedies  
If the product is found to be defective within the first two years from the later of date of purchase or  
date of manufacture, Accton’s entire liability and your exclusive remedy for any breach of warranty,  
shall be, at its option, to repair or replace the product at no charge except as set forth below. If the  
product is found to be defective after two years from the later of date of purchase or date of  
manufacture, Accton will charge a process and handling fee, provided that you deliver the product along  
with a return material authorization (RMA) number either to the company from whom you purchased it  
or to Accton. Accton warrants the repaired or replaced product to be free from defects in material and  
workmanship for the remainder of the original product’s warranty period. Consumable components are  
warranted only for two years.  
E-4  
Product Support Services  
 
Fast EtherHub-12s User’s Guide  
Return Process  
Before you may return any Accton product to Accton, you must request an RMA number by calling,  
FAXing or writing Accton’s Service Department at the address listed below. If you ship the product,  
you must assume the risk of damage or loss in transit. You must use the original container (or the  
equivalent) and pay the shipping charge. Accton may replace or repair the product with either a new or  
reconditioned product, and the returned product becomes Accton’s property. At Accton’s sole  
discretion, Accton will issue a credit for either a comparable replacement Accton product or credit the  
original purchase price towards the purchase of any Accton product for any unrepairable, defective  
product.  
This warranty does not cover replacement of products damaged by abuse, accident, misuse, neglect,  
alteration, repair, disaster, improper installation or improper testing.  
ACCTON SHALL NOT BE HELD LIABLE FOR ANY LOSS OF PROFITS, LOSS OF USE,  
INCIDENTAL, CONSEQUENTIAL OR SPECIAL DAMAGES CAUSED BY THE USE OF THIS  
PRODUCT OR INABILITY TO USE IT, EVEN IF THE COMPANY OR ACCTON HAS BEEN  
ADVISED OF SUCH LIABILITY OR OTHER SPECIAL CLAIMS.  
If you purchased this product in the USA, be aware that some states do not allow limitations on how  
long an implied warranty lasts, so the above limitations may not apply to you. Some states do not allow  
the exclusion or limitation of incidental or consequential damages, so the above limitations or  
exclusions may not apply to you. This warranty gives you specific legal rights and you may have other  
rights which vary from state to state. All parts or components contained in this product are covered by  
Accton’s Limited Lifetime Warranty for this product. The product may contain fully tested, recycled  
parts, warranted as if new.  
For warranty information:  
All territories except North and South America:  
Accton Technology Corporation, International Headquarters  
No. 1, Creation Rd. III, Science-based Industrial Park, Hsinchu 300, Taiwan, R.O.C.  
Phone: 886-3-5770-270 Fax: 886-3-5770-267 BBS: 886-3-5770-654  
North and South America:  
Accton Technology Corporation, USA Headquarters  
1962 Zanker Road, San Jose, CA 95112, U.S.A.  
Phone: 408-452-8900  
Fax: 408-452-8988  
BBS: 408-452-8828  
Product Support Services  
E-5  
 
Fast EtherHub-12s User’s Guide  
Accton Offices  
Accton Australia,  
Accton Technology Corporation  
International Headquarters,  
No. 1 Creation Rd. III,  
Science-based Industrial Park,  
Hsinchu 300, Taiwan, R.O.C.  
Hsinchu: Phone: 886-3-5770-270,  
Fax: 886-3-5770-267, 886-3-5775-541  
BBS: 886-3-5770-654  
Level 6, 10 Help Street  
Chatswood, N.S.W. 2067  
Australia  
Phone: 61-2-9410-9860  
Fax: 61-2-9410-9861  
BBS: 61-2-9410-9862  
Taipei: Phone: 886-2-577-1220 to 9  
Fax: 886-2-577-0816  
Accton Japan,  
Kano Bldg. 7F,  
1-25-1 Nishi-Gotanda,  
Shinagawa-ku,  
141 Tokyo, Japan  
Phone: 81-3-3495-1351  
Fax: 81-3-3495-1352  
Accton USA,  
1962 Zanker Road,  
San Jose, CA 95112, USA  
Phone: 408-452-8900, 408-452-8080  
Fax: 408-452-8988  
BBS: 408-452-8828  
FAST FAX: 408-452-8811  
Accton UK,  
The Mill Horton Road,  
Stanwell Moor,  
Staines. Middx. TW19 6BJ United Kingdom  
Phone: 44-1753-687677, 44-1753-680109  
Fax: 44-1753-689010  
Ordering Information  
Fast EtherHub-8s  
(EH3042-TX)  
Fast Ethernet Hub with 8 100BASE-TX ports  
Fast Ethernet Hub with 12 100BASE-TX ports  
Fast EtherHub-12s  
(EH3012-TX)  
Fast Ethernet Hub with 12 100BASE-TX ports,  
and 1 100BASE-FX port (SC or ST type port)  
Fast EtherHub-12se  
(EH3012-TF-SC) or  
(EH3012-TF-ST)  
E-6  
Product Support Services  
 
Glossary  
100BASE-TX  
IEEE’s specifications for 100 Mbps Ethernet using twisted-pair cable (100W Cat. 5 STP  
or UTP). The maximum length of cable for a point-to-point connection is 100 meters.  
Collision  
A condition in which two packets transmitted over a medium interfere with each other.  
Their interference makes both signals unintelligible. The transmitting devices have to  
halt transmission for a random period of time before trying to send data again.  
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.  
Daisy-Chain Port  
An MDI RJ-45 port used to cascade compatible devices in a daisy-chain configuration  
using straight-through twisted-pair cable. To cascade two devices, either run a connec-  
tion from the daisy-chain port on one device to a station port on the other device, or  
cascade the two devices by running crossover cable between MDI-X station ports on  
both devices.  
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
 
Fast EtherHub-12s User’s Guide  
Fast Ethernet  
100 Mbps 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 Mbps 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 to 10BASE-T (or 100BASE-  
TX). 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 or router). Pin-out assignments are shown in  
Appendix B.  
RJ-45 Connector  
Most common terminator for twisted-pair wiring.  
2
Glossary  
 
Fast EtherHub-12s User’s Guide  
Shielded Twisted-Pair (STP)  
100W Category 5 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 100Wand has the same pin assignment as UTP. This cable should not be  
confused with the older 150Wcable 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).  
Station Port  
The MDI-X port can be used for connecting the hub to any device that has a standard  
network interface (e.g., workstation, server or router). For port 12, the selector switch  
must be set toMDI-X. (This port can also be connected to an MDI port on another  
compatible hub or a switch.)  
Unshielded Twisted-Pair (UTP)  
Cable composed of insulated wires twisted together to reduce electrical interference;  
used in common telephone cord.  
Glossary  
3
 
Index  
Front Panel • 4-1  
A
G
Accton's Fast EtherHub-12s • 1-1  
Automatic Partitioning • 1-3  
Automatic Polarity Detection • 1-3  
Guidelines for Multiple Hub Configuration •  
3-3  
C
H
Cable Length  
Hardware Description • 4-1  
Precise Cable Length Budgeting • 2-4  
Simplified Cable Length Constraints • 2-4  
Certification • C-1  
I
Class II Repeater • 2-5, 3-3  
Configuring the Network • 3-1  
Connecting Multiple Hubs • 3-2  
Connecting the Hub System • 2-2  
Connection, Verifying • 2-6  
Crossover Cable • B-1  
IEEE 802.3u Standard • 2-5, 3-1  
Indicator Panel • 4-1  
Installation Requirements • 2-1  
Installing the System • 2-1  
Inter-hub Cabling Limit • 3-3  
Introduction to Fast Ethernet • 1-1  
D
J
Daisy-Chain Port  
Usage • 3-2  
Jabber Lock-up • 1-3  
Distance Limit for Fast Ethernet Cabling • 2-3  
L
LED Indicators  
Alert • 4-2  
Collision% • 4-3  
Link • 2-6, 4-4  
Partition • 4-4  
Power • 4-2  
E
EMI Certification • D-1  
Ethernet Ports • 4-5  
F
Traffic • 4-5  
Fast EtherHub-12s • 1-1  
FCC Warning • D-1  
Utilization% • 4-3  
Limited Warranty • E-4  
Index  
1
 
Fast EtherHub-12s User’s Guide  
Certification • C-1  
Interfaces • C-1  
M
Media Supported • C-1  
Power System • C-1  
Maximum Cable Length • 2-4  
MDI Daisy-chain Port • 3-2  
Standards Conformance • C-1  
Stand-alone Configuration • 3-1  
Standards Compliance • D-1  
N
Network Connection  
MDI Daisy-Chain Port • 2-3  
MDI-X Station Port • 2-2  
T
Troubleshooting • 4-5  
Configuration • A-3  
Hub Indicators • A-1  
Installation • A-2  
Power and Cooling • A-2  
Twisted-pair Cable  
P
Port and Cable Assignments • B-1  
Port Status Indicators • 4-4  
Power Cord Specifications • D-4  
Power Socket • 4-6  
Category 3,4,5 • 2-2, A-2  
Product Features • 1-2  
Product Support Services • E-1  
Accton Offices • E-6  
V
Verifying Port Status • 2-6  
Verifying System Operation • 2-6  
Bulletin Board Service • E-2  
Hardware Repair Service • E-1  
Interactive Fast Fax • E-2  
Ordering Information • E-6  
Technical Support • E-3  
Providing Power to the Hub • 2-5  
R
Rear Panel • 4-6  
Repeater Delay • 2-5, 3-3  
S
Safety Compliance • D-4  
Specifications  
2
Index  
 
EH3012-TX  
150114-101  
E0197-R02  
 

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