CheetaHub Power-3012B
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Copyright © 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.
International Headquarters
No. 1 Creation Road III,
USA Headquarters
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 and CheetaHub 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.
EH3012B
150611-101
E0997-R03
Package Contents
Carefully unpack the contents of the package and verify them
against the checklist given below.
Package Checklist
æ CheetaHub Power-3012B (Model No. EH3012B)
Ethernet hub with 12 dual-speed RJ-45 ports and 1 MII port
æ two brackets for rack mounting
æ four rubber foot pads
æ installation manual
æ warranty registration card
æ AC power cord
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 CheetaHub Power-3012B contains 12 RJ-45 ports for 10
Mbps or 100 Mbps Ethernet connection (detected by auto-
sensing). This dual-speed hub contains two internal repeater
buses – one for 10 Mbps traffic and another for 100 Mbps
traffic. Traffic passing between attached devices that operate at
the same speed is isolated within the appropriate repeater bus.
An internal Ethernet switch, consisting of a 10 Mbps and a 100
Mbps switching port, is used to link the repeater buses. Only
if traffic has to be passed between a 10 Mbps and a 100 Mbps
device, if the destination address is not found in the address
table, or broadcast traffic is sent, will data be forwarded to the
other internal repeater bus.
This hub provides an ideal bridge between 10 Mbps and 100
Mbps Ethernet networks, all for a price that’s comparable to a
standard Ethernet or Fast Ethernet hub. Moreover, the smart
design built into the 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 dual-speed CheetaHub.
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 a
standard size EIA 19-inch rack (using the mounting brackets
supplied with the hub).
These hubs are suitable for
desktop or rack mounting
Quick Installation
iii
CheetaHub Power-3012B User’s Guide
4. Connect PCs or other network devices to the RJ-45 ports.
Attach PCs or daisy-chain to
another device via the RJ-45 ports
Connect any devices that use standard network interface
cards to the RJ-45 (MDI-X) station ports (e.g., a workstation,
server, bridge or router). This hub uses auto-sensing to
dynamically set the required transmission speed at 10 Mbps
or 100 Mbps for the RJ-45 ports. To cascade to another hub
or switch, run straight-through twisted-pair cable from the
MDI port (10/100 Mbps) on this hub to any (MDI-X) station
port on the other device (or vice versa). If necessary, you
can also cascade to another hub or switch by running
crossover cable between MDI-X ports on the two devices.
Use the correct
twisted-pair cable
Use unshielded twisted-pair (UTP) or shielded twisted-pair
(STP) cable for RJ-45 connections: 100W Category 3, 4 or 5
cable for 10 Mbps connections or 100W Category 5 cable for
100 Mbps connections. Also be sure that the length of any
twisted-pair connection does not exceed 100 meters (328 feet).
Cascade limitations
When using the MDI port for 10 Mbps connections, note that
up to 4 hubs can be cascaded. However, when using the MDI
port for 100 Mbps connections or when using two MDI-X
ports connected with crossover cable for 100 Mbps
connections, only 2 hubs can be cascaded.
Limit total network span
When connecting devices to the dual-speed hub, note that the
total network span must be limited to:
Single Hub
200 meters of twisted-pair cable
Two-hub Chain 205 meters of twisted-pair cable (for Fast Ethernet links)
For example, if two PCs are connected to a hub, each using
100 meters (328 feet) of twisted-pair cable, then the total
network span of 200 meters (656 feet) is within the allowed
limits. However, if you cascade two Fast Ethernet hubs, and
connect a PC to each hub, each using 100 meters of cable, as
in the preceding example, then you can only use 5 meters (16
feet) of twisted-pair cable to link the two hubs together. The
only way to extend the cabling that connects the hubs is to
reduce the length of cable used to connect the PCs to the hubs.
iv
Quick Installation
CheetaHub Power-3012B User’s Guide
5. Connect other media types using the D-type MII port.
Attach to alternate media
types via the Class I MII port
You can also connect to other network devices using the
media independent interface (MII) on the back panel. You
can attach to 100BASE-TX (operating at 100 Mbps only),
100BASE-T4 or 100BASE-FX media types by plugging the
appropriate transceiver into the MII connector. This port can
be used to connect the hub to a collapsed backbone, or for
media conversion to a compatible network device. However,
note that the MII Port is Class I, and therefore cannot be
cascaded to another hub.
Limits on total network
span also apply to MII port
When connecting a switch or router to the MII port with
twisted-pair cable, the maximum network span is 200 meters
or 656 feet (i.e., 100 meters for the downlink from the switch
or router to the hub, and 100 meters from hub to workstation).
However, by attaching fiber-optic cable to the MII port on
the rear panel, the maximum network span can be extended
to 260 meters or 853 feet (i.e., 160 meters for the fiber optic
downlink from the hub to the switch or router, and 100
meters from hub to workstation).
6. These hubs can serve as a collapsed backbone for small
networks, or can be connected to a network interconnection
device via one of the RJ-45 ports or the MII port. (Refer to
Chapter 3 for sample applications.)
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 installing this dual-speed
CheetaHub, refer to Chapter 2 for a detailed description of
installation procedures, Chapter 3 for sample configurations, or
Appendix A for help in troubleshooting.
Quick Installation
v
About this Guide
This guide is designed for the experienced network installer.
It describes how to install and operate Accton’s dual-speed
CheetaHub. 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 technology, followed by a
description of this hub and a summary of its important features
and specifications.
Chapter 2
Chapter 3
- Installing the System
Installing a dual-speed CheetaHub and making basic network
connections.
- Setting up Network Connections
Shows sample network configurations for a local area network.
Appendices - Troubleshooting, cable assignments, and product specifications.
About this Guide
vii
Contents
Chapter 1: Product Overview
1-1
Introduction to Fast Ethernet
Accton’s Dual-Speed CheetaHub System
Basic Features
1-1
1-1
1-2
Chapter 2: Installing the System
2-1
Pre-Installation Requirements
Hardware Installation
2-1
2-2
2-2
2-3
2-4
2-4
2-5
2-6
2-7
2-8
2-8
2-8
2-8
2-9
2-9
2-10
Stacking Hubs on a Flat Surface
Mounting Hubs in a Rack
Connecting the Hub System
Making a Connection via an MDI-X Station Port
Making a Connection via the Daisy-Chain Port
Restrictions on Cascade Length
Making a Connection via the MII Port
Providing Power to the Hub
Connecting to the Power Supply
Diagnostic Tests
Hot Remove
Fuse
Verifying Port Status
Verifying System Operation
Chapter 3: Configuring the Network
3-1
Stand-Alone Network
Cascading Hubs with the Daisy-Chain Port
Making an Uplink with Fiber Optic Cable
3-1
3-2
3-4
Appendix A: Troubleshooting
A-1
Diagnosing Hub Indicators
System Diagnostics
Installation
A-1
A-2
A-2
A-2
A-3
Configuration
System Integrity
Contents
ix
CheetaHub Power-3012B User’s Guide
Appendix B: Port and Cable Assignments
B-1
RJ-45 Port
MII Port
B-1
B-2
Appendix C: Product Specifications
C-1
Repeater Criteria
Network Criteria
Internal Switching Criteria
C-1
C-1
C-2
Appendix D: Standards Compliance
D-1
EMI Warning
D-1
D-1
D-2
D-2
D-3
D-3
D-4
FCC Class B
Voluntary Control Council for Interference (VCCI-B)
EN55022 Declaration of Conformance
Safety Compliance
Underwriters Laboratories Compliance Statement
Sicherheitshinweise
Appendix E: Product Support Services
E-1
Product Registration
Problem Report
Hardware Repair Service
Bulletin Board Service (BBS)
Interactive Fast Fax (U.S.A. Office)
Technical Support
E-1
E-1
E-1
E-2
E-2
E-3
E-4
E-4
E-5
E-6
E-6
Limited Warranty
Customer Remedies
Return Process
Accton Offices
Ordering Information
Glossary
Index
x
Contents
CheetaHub Power-3012B User’s Guide
List of Figures
Figure 2-1 Stacking Hubs on a Flat Surface
Figure 2-2 Mounting Hubs in a Rack
Figure 2-3 Hub Indicators
2-2
2-3
2-9
3-2
Figure 3.1 Stand-Alone Configuration
Figure 3.2 Multiple Hub Configuration Using Daisy-Chain Port 3-3
Figure 3.3 Uplinked Hub Using Fiber Optic Cable
Figure B-1 RJ-45 Connector (on the Hub Side)
Figure B-2 MII Connector
3-4
B-1
B-2
List of Tables
Table 2-1 Hub Indicators
Table 3-1 Maximum Network Span with Stand-Alone Hub
Table 3-2 Maximum Hub Cascade
2-9
3-1
3-3
Table 3-3 Maximum Network Span with Fiber Optic Uplink 3-4
Table B-1 RJ-45 Pin Assignments
Table B-2 MII Pin Assignments
B-1
B-2
Contents
xi
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