Accton Technology Fast EtherHub 3500 Series User manual

Fast EtherHub 3500 System
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Installation and User’s Guide
Fast EtherHub 3500 System
Intelligent
Fast Ethernet Stackable Hub
with 12 100BASE-TX Ports;
including SNMP Management Support

Copyright (c) 1996 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,
Science-based Industrial Park
Hsinchu 300, Taiwan, R.O.C.
Phone: [phone]
FAX: [phone]
BBS: 886-3-5770-654
Internet: [email protected]
86$+HDGTXDUWHUV
1962 Zanker Road
San Jose, CA 95112
Phone: [phone]
FAX: [phone]
BBS: 408-452-8828
FAST FAX: [phone]
Accton, EtherHub, SmartWatch, SmartExtender and AccView and 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.
EH3512I-TX
EH3512M-TX
E1296-R01
150136-101

Package Contents i
Package Contents
Carefully unpack the contents of the package and verify them
against the checklist given below. This checklist applies to all
the Fast EtherHub 3500 Series models unless otherwise specified.
Package Checklist
æFast EtherHub-12i
Intelligent Fast Ethernet Stackable Hub with 12 100BASE-TX Ports
(Model No. EH3512I-TX)
or Fast EtherHub-12mi SNMP
Intelligent Fast Ethernet Stackable Hub with 12 100BASE-TX Ports;
including SNMP Managment Support
(Model No. EH3512M-TX)
æTwo mounting brackets
æFour rubber foot pads
æOne AC power cord
æOne 20 cm FlexBus 3500 stack cable
æInstallation manual
æOwner 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.

Quick Installation iii
Quick Installation
Accton’s Fast EtherHub 3500 models each contain 12 Fast
Ethernet (100BASE-TX) RJ-45 ports, one MDI daisy-chain port,
and one slot for an optional connection using 100BASE-TX
(10BASE-T), 100BASE-T4 or 100BASE-FX.
The smart design built into the front display panel and
configure options provide 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 3500 unit.
2. Find a location close to the network devices you need to
connect, and within easy reach of an electrical outlet.
These hubs are suitable for
desktop or rack mounting
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 EIA 19-inch rack.
Attach PCs to the station ports
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 100WCategory 5 unshielded twisted-
pair (UTP) or 100Wshielded twisted-pair (STP) cable. Also
be sure that the length of any twisted-pair connection does
not exceed 100 meters. (Refer to Chapter 2 for a more
detailed description of calculating the maximum cable length
permitted between two end nodes.)
Attach each hub in the stack
with FlexBus 3500 stack cable
5. If you are stacking multiple hubs, connect the FlexBus 3500
stack cable between the “Out” and “In” backplane ports on
adjacent hubs. Run a simple chain starting at the Out port on
the top hub in the stack, and ending at the In port on the
bottom hub in the stack. No more than 6 hubs can be
connected via the backplane bus.

Fast EtherHub 3500 System User’s Guide
iv Quick Installation
Attach each hub to one of th
e
backplane segment
s
6. Connect each hub to one of the 3 Fast Ethernet segments
embedded in the backplane bus using either on-board
configuration (Chapter 4) or optional network management
software (e.g., AccView/Open). You can leave a hub isolated
from the backplane if required for your network environment
(e.g., to restrict network access for the attached user group).
However, you should be careful to structure your network
connections so that nodes which communicate frequently are
located in the same segment. (Factory default is Segment 1.)
Use the SmartExtender Module t
o
interconnect different segments i
n
the stac
k
7. Bridge the different backplane segments in the Fast Ethernet
3500 stack by running a connection from the optional
100BASE-TX extender module on this hub to any station
port on another hub in the stack that has been assigned to a
different segment. Remember that devices connected to the
switching port exist in a separate segment (and unless also
connected to the FlexBus management channel) cannot be
controlled by a management agent in the stack. When
connecting a hub to the expansion port, the maximum cable
length is 100 meters.
Or interconnect the stack’
s
segments by attaching the daisy-
chain port to a switch, or the
station ports to a router
8. If you do not have any available SmartExtender Modules,
the different segments in a Fast EtherHub 3500 stack can
also be combined into an interconnected network by running
a cable from the hubs’ daisy-chain ports (i.e., using port
12MDI on hubs attached to the different segments) to a
network interconnection device such a switch; or by running
a cable from the hubs’ station ports (i.e., using ports on hubs
attached to different segments) to a router.
Attach to the extended networ
k
via the daisy-chain por
t
9. You can also attach the overall stack to a network intercon-
nection device via the daisy-chain port (when connecting to
a switch) or via a station port (when connecting to a router).
Run straight-through twisted-pair cable from the hub to the
other device. When attaching to a switch, run cable from the
MDI daisy-chain port on this hub to any (MDI-X) station
port on the switch (or vice versa).
Note: When using the 12MDI daisy-chain port, remember that port
12X cannot be used.

Fast EtherHub 3500 System User’s Guide
Quick Installation v
Or attach to the extended
network via the SmartExtender
Module
The SmartExtender Module can
be used to attach to another
network device that uses a
different media type
10.If an optional SmartExtender Module is installed in the
expansion port, it can be used to make a bridged connection
from this hub to another network device using 100BASE-TX
(10BASE-T), 100BASE-T4 or 100BASE-FX media types.
When connecting a node to the expansion port, the maxi-
mum cable length is 100 meters for twisted-pair cable, and 2
kilometers for fiber. (Refer to Chapter 2 for a more detailed
description of calculating the maximum length permitted for
fiber optic cable.)
Attach the SmartExtender Module
to a hub, switch, bridge or router
You can use the extender module to bridge this hub to
another Ethernet or Fast Ethernet hub or stack; or to attach it
to a network interconnection device, such as a switch, bridge
or router. However, when using the expansion port to cascade
to other networking devices outside the stack, note that the
maximum cascade length should be limited to 7 devices.
Transmission speed is automatically
set for any connection made to the
SmartExtender Module
For integrating legacy networks, the 100BASE-TX extender
module provides for connection via either 100BASE-TX or
10BASE-T. All 100BASE entender modules use auto-sensing
to set the transmission speed at 10 or 100 Mbps. In other words,
this module can correctly set the transmission speed for the
attached device, even if it does not support auto-negotiation.
Transmission mode automatically
configured for the connected device
only if it supports auto-negotiation
Use half duplex for a
shared collision domain
The extender modules, except for 100BASE-T4, support both
half-duplex and full-duplex communications. However, for
this hub to correctly set the transmission mode, the attached
device must also support auto-negotiation. If auto-negotiation
fails, the transmission mode defaults to half duplex. If this
setting is not suitable, then the transmission mode must be
manually configured via on-board configuration (Chapter 4)
or optional network management software (e.g., AccView/Open).
To reactivate auto-negotiation, just unplug a connection from
the port on the hub and plug it in again. Remember that full-
duplex mode can only be used for a dedicated link, such as that
provided by the SmartExtender Module. When connecting to a
shared collision domain (i.e., another hub) set the transmission
mode for half duplex.

Fast EtherHub 3500 System User’s Guide
vi Quick Installation
Difference in connecting to the
extended network via the daisy-
chain port or SmartExtenter Module
The Fast EtherHub 3500 stack can be connected to a larger
network using any device such as a switch, bridge or router.
Depending on your network configuration, you may attain
better performance by making a direct connection from the
daisy-chain port (or a station port) on this hub to an
interconnection device. Making a connection from an
extender module may introduce slightly more delay.
Check your connections
11. 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
3500 system, refer to Chapter 2 for a detailed description of
installation procedures, or to Appendix A for help in
troubleshooting.

About this Guide vii
About this Guide
This guide is designed for the experienced network installer.
It describes how to install and operate Accton’s Fast EtherHub
3500 system. 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 3500 and making basic network
connections. Also includes a description of significant
components on the hub including ports and indicators.
Chapter 3 - Setting up Network Connections
Shows sample network configurations for a local area network.
Chapter 4 - Configuring the System
Describes how to manage the system via the on-board
configuration program.
Chapter 5 - Hardware Reference
Detailed description of indicator panel and ports.
Appendices - Troubleshooting, cable assignments, and product specifications.

Contents
Contents ix
Chapter 1: Product Overview 1-1
Introduction to Fast Ethernet 1-1
Brief Description of the Fast EtherHub 3500 System 1-1
Distinguishing Factors of Fast EtherHub 3500 System 1-5
Basic Features of Fast EtherHub 3500 System 1-6
Data Switching with the SmartExtender Modules 1-9
Switching Technology 1-9
Configuration Options for the SmartExtender Modules 1-9
Switching Methods 1-10
Chapter 2: Installing the System 2-1
Pre-Installation Requirements 2-1
Hardware Installation 2-2
Stacking Hubs without a Rack 2-2
Mounting Hubs in a Rack 2-3
Connecting the Hub System 2-4
Making a Connection via an MDI-X Station Port 2-4
Connecting to the Stack’s Backplane 2-5
Making a Connection via the MDI Daisy-Chain Port 2-6
Connecting to a SmartExtender Module 2-6
Installing a Backup Power Supply 2-11
Powering on the Hub 2-12
Diagnostic Tests 2-12
Hot Remove 2-13
Configuring a Manageable Stack 2-14
Installing an SNMP Backup Agent 2-14
Verifying Port Status 2-15
Verifying System Operation 2-15