SynOptics 2813SA, 2814SA Using Manual

Using the Model 281xSA
Ethernet Hub

SynOptics Communications, Inc.
4401 Great America Parkway
Santa Clara, CA 95054
408-988-2400

May 1994

© 1994 by SynOptics Communications, Inc. All rights reserved.

Trademarks

SynOptics and SynOptics Communications are registered trademarks of SynOptics
Communications, Inc. Model 281xSA Ethernet Hub, Expanded View, and Autotopology are
trademarks of SynOptics Communications, Inc.

Other brand and product names are registered trademarks or trademarks of their respective
holders.

Statement of Conditions

In the interest of improving internal design, operational function, and/or reliability, SynOptics
Communications, Inc. reserves the right to make changes to the products described in this
document without notice.

SynOptics Communications, Inc. does not assume any liability that may occur due to the use or
application of the product(s) or circuit layout(s) described herein.

One program, the Compression/Decompression Library, in this product contains free software;
you can distribute the Compression/Decompression Library and/or modify it under the terms of
the GNU General Public License as published by the Free Software Foundation; either version 2
or (at your option) any later version.

The Compression/Decompression Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.

T o recei ve a copy of the source code for the Compression/Decompression Library, and associated
make files, free of charge, contact SynOptics Communications, Inc., attention Corporate
Secretary.

Federal Communications Commission (FCC) Statement

Note: 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. If it is not
installed and used in accordance with the instruction manual, it may cause harmful interference
to radio communications. Operation of this equipment in a residential area is likely to cause
harmful interference, in which case users will be required to take whatever measures may be
necessary to correct the interference at their own expense.

EN 55 022 Declaration of Conformance

This is to certify that the SynOptics Communications Model 281xSA Ethernet Hub is shielded
against the generation of radio interference in accordance with the application of Council
Directive 89/336/EEC, Article 4a. Conformity is declared by the application of EN 55 022:1987
Class B (CISPR 22:1985/BS 6527:1988).

Compliance with the applicable regulations is dependent upon the use of shielded cables.

ii 893-743-A

Bestätigung des Herstellers/Importeurs

Es wird hiermit bestätigt, daß das Model 281xSA Ethernet Hub gemäß der im BMPT -AmtsblVfg
243/1991 und Vfg 46/1992 aufgeführten Bestimmungen entstört ist. Das vorschriftsmäßige
Betreiben einiger Geräte (z.B. Testsender) kann jedoch gewissen Beschränkungen unterliegen.
Lesen Sie dazu bitte die Anmerkungen in der Betriebsanleitung.

Das Bundesamt für Zulassungen in der T elek ommunikation wurde dav on unterrichtet, daß dieses
Gerät auf den Markt gebracht wurde und es ist berechtigt, die Serie auf die Erfüllung der
Vorschriften hin zu überprüfen.

Die Erfüllung der zutreffenden Vorschriften hängt von der Benutzung geschirmter Kabel ab. Der
Benutzer ist für den Erwerb der entsprechenden Kabel verantwortlich.

Certificate of the Manufacturer/Importer

It is hereby certified that the Model 281xSA Ethernet Hub has been suppressed in accordance
with the conditions set out in the BMPT -AmtsblVfg 243/1991 and Vfg 46/1992. The operation of
some equipment (for example, test transmitters) in accordance with the regulations may,
however, be subject to certain restrictions. Please refer to the notes in the operating instructions.

Federal Office for Telecommunications Approvals has been notified of the placing of this
equipment on the market and has been granted the right to test the series for compliance with the
regulations.

Compliance with the applicable regulations is dependent upon the use of shielded cables. It is the
responsibility of the user to procure the appropriate cables.

Voluntary Control Council for Interference (VCCI) Statement

Voluntary Control Council for Interference (VCCI) Statement

This equipment is in the 1st category (information equipment to be used in commercial and/or
industrial areas) and conforms to the standards set by the Voluntary Control Council for
Interference by Data Processing Equipment and Electronic Office Machines that are aimed at
preventing radio interference in commercial and/or industrial areas.

Consequently, when this equipment is used in a residential area or in an adjacent area thereto,
radio interference may be caused to equipment such as radios and TV receivers.

Compliance with the applicable regulations is dependent upon the use of shielded cables. The
user is responsible for procuring the appropriate cables. Read instructions for correct handling.

893-743-A iii

iv 893-743-A

Contents

Preface

Purpose xv
Audience xv
Conventions xvi

Special Message Formats xvi
Two-tiered Procedure Format xvi
Use of Enter, Type, and Press xvi

Other Conventions xvii
Related Publications xvii
SynOptics Customer Support xviii

Chapter 1 Overview of the Model 281xSA Hub

Features 1-2
Functional Description 1-3
Management Functions in the Model 281xSA Hubs 1-4

Dedicated Data Collection 1-4

SNMP-based Management 1-4

Agent Software 1-5
MIB-II 1-5

Support for SynOptics Optivity Features 1-6

Expanded View 1-6
Autotopology 1-6
Show Nodes/Find Nodes 1-6
Allowed Nodes Security 1-6
Thresholds 1-7

Service Port Management 1-7

Chapter 2 Installing the Model 281xSA Hub

Site Preparation 2-1

Operating Environment Requirements 2-2

Physical Location Requirements 2-2
Package Contents 2-3
Required Tools and Materials 2-4
Table or Shelf Installation 2-5
Rack Installation 2-7
Wall Installation 2-10

893-743-A v

Chapter 3 Network Configurations and Cable Connections

Building Network Configurations 3-2
Single-hub Network 3-3

Ethernet Station Connections 3-3

Cable Connections in the Work Area 3-4

Using an AUI Network Interface Card 3-4
Using a 10BASE-T Interface Card 3-6

Cable Connections in the Wiring Closet 3-7

Cluster Configurations 3-11

Cluster Operation 3-12
Connecting a Cluster Configuration 3-12

Multiple-hub Networks—System 2000 Only 3-14

Configuration Rules 3-14
Interconnecting Model 2813SA Hubs Using the AUI Port 3-14

Connecting the AUI Port to a Fiber Backbone 3-15

Connecting the AUI Port to Coaxial Backbone 3-16
Interconnecting Model 2814SA Hubs Using the 10BASE-FL Port 3-18
Interconnecting Hubs Using the MDI Port 1 3-19

Multiple-hub Networks—Including System 3000 Products 3-20

Chapter 4 Configuring the Model 281xSA Hub for IP/IPX Networks

Required Network Information and Configuration Actions 4-1
IP/IPX and BootP Network Configuration Options 4-2
Using the Service Port 4-3

Terminal Connection Requirements 4-3
Connecting to the Model 281xSA Service Port 4-3

Power-on Self-test Diagnostic Messages Display 4-5
Summary of the Boot Sequence with a BootP Server 4-7
Setting the Boot Configuration without a BootP Server 4-8
Using Configuration Menus 4-12

Commands 4-14

Boot Configuration Menus 4-15

Boot Configuration Commands 4-16

System Configuration Menu 4-21

Boot File Configuration Menu 4-22

IP Configuration Menu 4-24

IPX Configuration Menu 4-25

vi 893-743-A

Setting Run-time Parameters 4-27

Protocol Parameters Menu 4-29

IP Parameters Menu 4-31
IPX Parameters Menu 4-33

SNMP Parameters Menu 4-34

SNMP Trap Receivers for IP 4-36

SNMP Trap Receivers for IPX 4-37
Out-of-Band Parameters Menu 4-40
Setting Security Parameters 4-41
Profile Parameters Menu 4-43
Boot Parameters Menu 4-44

Appendix A Technical Specifications
Appendix B LEDs and Switches

Reset Button B-4
MDI-X/MDI Switch B-4

Appendix C Pin Assignments

AUI Port C-1
10BASE-T Ports C-1
RS-232 Port C-2
Using the RS-232 Serial Port for an Out-of-band Connection C-3
Service Port C-4

Appendix D Link Integrity Test Function
Appendix E Autopolarity Detection and Correction
Appendix F IP Addressing

Classes of Internet Addresses F-1
Internet Address Notation F-2
Allowable Internet Addresses F-3
Internet Address Conventions F-3
Addresses and Routing F-4
Subnetting F-4

Subnetting and Routing F-5
Subnet Masks F-5

893-743-A vii

Appendix G Setting Up the Model 281xSA Hub Configuration File

Sample Configuration File G-1
Configuration Parameters G-9

Appendix H System Messages

System Operation Display Messages H-1
Service Port Boot Messages H-2

TFTP Error and Information Messages H-2
Memory Error Messages H-5

Reset Message H-5
Service Port Run-time Messages H-6
Configuration File Messages H-7

Appendix I Replacing SIMMs

Preparation I-2

Tools and Equipment I-2

Preparatory Steps I-2
Removing the Cover I-3
Replacing the SIMM I-5
Setting Jumpers I-10
Reinstalling the Cover I-11
Final Steps I-12

Index

viii 893-743-A

Figures

Figure 1-1. Model 2813SA Ethernet Hub 1-1
Figure 1-2. Model 2814SA Ethernet Hub 1-1

Figure 2-1. Model 281xSA hub package contents 2-4
Figure 2-2. Attaching feet 2-5
Figure 2-3. Connecting the power cord 2-5
Figure 2-4. Power LED 2-6
Figure 2-5. Attaching brackets for rack installation 2-7
Figure 2-6. Installing the hub in an equipment rack 2-8
Figure 2-7. Connecting the power cord 2-9
Figure 2-8. Power LED 2-9
Figure 2-9. Attaching brackets for wall mounting 2-10
Figure 2-10. Template for wall mounting 2-11
Figure 2-11. Securing the Model 281xSA hub to the wall 2-12
Figure 2-12. Connecting the power cord 2-12
Figure 2-13. Power LED 2-13

Figure 3-1. Typical single-hub configuration 3-3
Figure 3-2. Connecting an AUI cable to a Model 508B 10BASE-T

Transceiver 3-4

Figure 3-3. Connecting a Model 928 transceiver to a network

station 3-5
Figure 3-4. Connecting UTP cable to a Model 508B transceiver 3-5
Figure 3-5. Connecting the Model 928 transceiver to the wall 3-6
Figure 3-6. Connecting a 10BASE-T interface card 3-7
Figure 3-7. MDI-X/MDI switch set to the MDI-X position 3-8
Figure 3-8. Connecting 25-pair UTP cable 3-9
Figure 3-9. Model 281xSA hub 10BASE-T port connection 3-10
Figure 3-10. Typical Model 2813/2803 cluster configuration 3-11
Figure 3-11. Connecting a cluster configuration 3-13
Figure 3-12. Interconnecting Model 2813SA hubs using an IEEE 802.3

10BASE-FL transceiver 3-15

Figure 3-13. Interconnecting Model 281xSA hubs using coaxial

backbone 3-17
Figure 3-14. Connecting Model 2814SA hubs using the 10BASE-FL

port 3-18
Figure 3-15. Interconnecting hubs via the MDI port 3-19
Figure 3-16. MDI-X/MDI switch set to MDI 3-20

893-743-A ix

Figure 3-17. Network including a Model 3000 concentrator 3-21
Figure 3-18. Fully manageable network composed entirely

of Model 281xSA clusters and single hubs 3-22

Figure 4-1. Hardware address label 4-1
Figure 4-2. Diagnostic messages for the Model 281xSA hub 4-5
Figure 4-3. BootP service port screen display 4-6
Figure 4-4. Boot main menu 4-9
Figure 4-5. Boot messages (remote image file load) 4-10
Figure 4-6. Boot messages (local image file load) 4-11
Figure 4-7. Primary boot configuration menus 4-12
Figure 4-8. Run-time parameters menus 4-13
Figure 4-9. Sample configuration menu 4-14
Figure 4-10. Boot main menu 4-15
Figure 4-11. System Configuration menu 4-21
Figure 4-12. Boot File Configuration menu 4-22
Figure 4-13. IP Configuration menu 4-24
Figure 4-14. IPX Configuration menu 4-26
Figure 4-15. Menu for changing run-time parameters 4-27
Figure 4-16. Protocol Parameters menu 4-29
Figure 4-17. IP Parameters menu 4-31
Figure 4-18. Changing the IP parameters 4-32
Figure 4-19. IPX Parameters menu 4-33
Figure 4-20. SNMP Parameters menu 4-34
Figure 4-21. SNMP IP Trap Receivers menu 4-36
Figure 4-22. SNMP IPX Trap Receivers menu 4-38
Figure 4-23. Out-of-Band Parameters menu 4-40
Figure 4-24. Set Security Parameters menu 4-42
Figure 4-25. Profile Parameters menu 4-43
Figure 4-26. Boot Parameters menu 4-44

Figure B-1. Model 2813SA Ethernet Hub front panel B-1
Figure B-2. Model 2814SA Ethernet Hub front panel B-1
Figure B-3. Reset button B-4
Figure B-4. Internal crossover function B-5
Figure B-5. External crossover function B-5
Figure B-6. MDI-X/MDI switch B-6

x 893-743-A

Figure F-1. Class A Internet Address F-1
Figure F-2. Class B Internet Address F-1
Figure F-3. Class C Internet address F-2
Figure F-4. Subnet field in a Class B address F-4

Figure I-1. Cover retaining screws I-3
Figure I-2. Removing the hub cover I-4
Figure I-3. SIMM location I-6
Figure I-4. Removing a SIMM I-7
Figure I-5. Installing a SIMM I-8
Figure I-6. DRAM jumpers I-10
Figure I-7. Reinstalling the cover I-11
Figure I-8. Cover retaining screws I-12

893-743-A xi

xii 893-743-A

Tables

Table B-1. Model 281xSA hub LEDs B-2
Table B-2. Model 281xSA hub µP Fault and On Line LED

combinations B-3
Table C-1. AUI port pin assignments (DB-15 socket) C-1
Table C-2. 10BASE-T port pin assignments (RJ-45 jack) C-2
Table C-3. RS-232 interface port pin assignments (DB-25 plug) C-2
Table C-4. Service port pin assignments (DB-9 plug) C-4

Table F-1. Reserved and available Internet addresses F-3
Table F-2. Subnet masks F-5

Table H-1. System operation messages H-1
Table I-1. DRAM SIMM capacities and types I-5

Table I-2. Jumper settings for total memory I-10

893-743-A xiii

xiv 893-743-A

Preface

Purpose

Congratulations on your purchase of the SynOptics® Model 281xSA Ethernet
Hub. These standards-based 10B ASE-T hubs provide networking solutions for
low- and medium-density 10BASE-T networks that use Simple Network
Management Protocol (SNMP) network management.

This guide describes how to install and use the Model 281xSA Ethernet Hub,
including configuration rules for connecting Ethernet stations and making
network interconnections.

Configuration procedures for IP/IPX networks include instructions on how to
prepare the hub for configuration, an explanation of how to use configuration
menus, and descriptions of specific configuration menus and commands.

Audience

Before installing the Model 281xSA hub, read Chapter 3, “Network
Configurations and Cable Connections,” to plan the placement and connection
of hubs and Ethernet stations.

Throughout this guide,

System 2000

or

Model 28xx hub

is used to refer to the
Model 2803, 2804, 2813SA, or 2814SA hub, and Model 281xSA hub refers
to either the Model 2813SA or the Model 2814SA Ethernet Hub. Where a
reference is specific to one of the models, the specific model number is used.

This guide is intended for network installers or administrators who are
responsible for configuring, installing, or maintaining an Ethernet network with
Model 281xSA hubs. These individuals should have the following background
and experience:

Working knowledge of SNMP networking

■

Familiarity with setting up Ethernet, 10BASE-T, IP, and IPX networks

■

893-743-A xv

Preface

Conventions

This section describes the conventions used in this guide.

Special Message Formats

This guide uses the following formats to highlight special messages:

NOTE:

This format is used to highlight information of importance or special

interest.

CAUTION:

prevent equipment failure or loss of data.

WARNING:

injury or equipment damage.

Two-tiered Procedure Format

The procedural steps in this guide are presented in a two-tiered format. The first
tier describes the step very briefly, but precisely. An experienced user may only
need to read the first tiers to complete the task. The second tier describes the
step in more detail and may include results of performing the step.

Use of Enter, Type, and Press

This guide uses enter, type, and press to describe the following actions:

■

When you read “enter,” type the text and press the Enter key.

This format is used to highlight information that will help you

This format is used to highlight material involving possibility of

When you read “type,” type the text, but do not press the Enter key.

■

■

When you read “press,” press only the alphanumeric or named key.

xvi 893-743-A

Other Conventions

Related Publications

This guide uses the following typographical conventions:

italics

bold

Configuration file keywords.

courier font

Initial Caps Menu titles and window and button names.
[Enter] Named keys in text are shown enclosed in square

[Ctrl]+C Two or more keys that must be pressed simultaneously

ALL CAPS DOS file and directory names.

Related Publications

For more information about Ethernet networks, refer to the

3000 Ethernet Connectivity Guide

more information about network management, refer to the documentation that
was shipped with your SynOptics network management software.

Configuration file parameters; book titles; and UNIX
file, command, and directory names.

Screen text, user-typed command-line entries.

brackets. The notation [Enter] is used for the Enter key
and the Return key.

are shown in text linked with a plus (+) sign.

LattisNet System

(SynOptics part number 893-211-B). For

To purchase SynOptics product publications, order by part number from
SynOptics Press at the following numbers. You may also request a free catalog
of SynOptics Press product publications.

■

Phone: [phone]

■

FAX: U.S/Canada: 1-800-582-8000, International: 1-916-939-1010

893-743-A xvii

Preface

SynOptics Customer Support

For assistance with installing and configuring your SynOptics systems or
for post-installation questions or problems, contact your local reseller. If you
cannot contact your local reseller, call the SynOptics Technical Response
Center (TRC) Contract Hotline.

To contact the TRC Contract Hotline, call:

■

U.S. and Canada: 1-800-473-4911
Europe: 011-31-3480-31616

■

Rest of the world: 408-764-1000

■

Technical information is available from the SynOptics InfoFACTS fax-on­demand system by calling:

U.S. and Canada: 1-800-786-3228

■

■

International: 408-764-1002

You can also access technical information in the SynOptics forum on
CompuServe.

For information about our education services, contact the SynOptics Training
Coordinator at 1-800-473-4911 or 408-764-1018.

xviii 893-743-A

Chapter 1 Overview of the Model 281xSA Hub

The Model 2813SA and 2814SA Ethernet Hubs (see Figure 1-1 and
Figure 1-2, respectively) are preconfigured for plug-and-play operation. These
workgroup hubs support 10BASE-T Ethernet in a manageable, physical star
configuration using a building’s existing premises wiring. Model 281xSA
Ethernet Hubs offer a cost-effective solution for high-power, low-density
10BASE-T departmental segments, as well as the flexibility and expandability
to support medium-density 10BASE-T workgroups operating within a large
enterprise network.

Expansion

2345

Partition

Int

AUI

System Operation

Link Part

MDI-X/MDI

Reset

123 4 567 8 910111213141516

RS-232 Service Port

MDI-X

Power

µP FaultOn Line

NM

Control

Isolate Data (Data) Col

AUI Port

4638

NM

Power

Control

TX RX

10BASE-FL Fiber Port

µP FaultOn Line

Isolate Data <Data> Col

Expansion

2345

Int

Partition

Link

Figure 1-1. Model 2813SA Ethernet Hub

System Operation

Link Part

MDI-X/MDI

Reset

123 4 567 8 910111213141516

RS-232 Service Port

MDI-X

Figure 1-2. Model 2814SA Ethernet Hub

The Model 281xSA Ethernet Hub includes fully integrated SNMP-based
Advanced Analyzer network management capabilities compatible with
SynOptics network management software or other SNMP-compatible network
management software.

This chapter includes the following topics:

A list of features of the Model 281xSA hub

■

4639

A summary of Model 281xSA hub functions

■

■

Descriptions of management options for the Model 281xSA hub

893-743-A 1-1

Overview of the Model 281xSA Hub

Features

Each Model 281xSA Ethernet Hub has the following features:

Support for all RMON groups except packet capture and filter

■

■

Flash memory that allows local loading of image and configuration data

■

Sixteen IEEE 802.3i 10BASE-T ports:
– Shielded modular RJ-45 jacks for unshielded twisted pair (UTP) cable

– MDI/MDI-X configuration switch for port 1 to connect the Model

– MDI-X-only configuration for ports 2 through 16

or shielded twisted pair (STP) cable using a Model 822 10BASE-T-to­Type 1 Adapter

281xSA hub directly without using an external crossover cable or
adapter

– Per-port automatic link integrity test function
– Per-port automatic disconnection (autopartition) of a port for too many

consecutive collisions or a collision that is too long)

– Automatic +/– polarity detection and correction of the receive data

wire-pair for each port

One AUI port (on the Model 2813SA hub) for connecting an Ethernet

■

IEEE 802.3 transceiver—allowing connection to another network hub,
station, or segment using coaxial, fiber optic, or twisted pair cable

or
One optical port (on the Model 2814SA hub) for direct connection to fiber

■

optic cable

■

Front-panel LEDs displaying link and partition status of each port, power
status, data activity, collision, and AUI partition or fiber optic link status

Front panel system operation display showing network utilization

■

■

Front-accessible reset button
One service port, implemented on a DB-9 plug, for connection of a

■

terminal

1-2 893-743-A

One standard RS-232 serial communications port, implemented on a

■

Functional Description

DB-25 plug, for out-of-band connection to the telephone voice network
through an external modem

■

Installation options on a table, on a wall, or in a standard 19-inch
equipment rack

One local area network interface processor (LANIP) chip to collect

■

network and station statistics, monitor functions, and provide SNMP
communication for one Ethernet segment

Dual-stack agent support for SNMP monitoring and control over both

■

IP and IPX network protocols

■

Bootstrap Protocol (BootP) automatic boot and download protocol support
using Trivial File Transfer Protocol (TFTP)

Boot firmware that allows separate downloading of agent image and

■

configuration data

Functional Description

The System 2000 10BASE-T hubs offer a unique, scalable architecture that
allows small networks to grow easily to accommodate additional users. Single
hubs can serve as standalone units to support entry-level departmental
10BASE-T LANs. As network requirements grow, the initial investment is
maintained by the unique expansion connection capability of the System 2000
hub. Hubs can be connected through special expansion ports that extend
management control to all ports in the network cluster while the cluster remains
as one logical IEEE 802.3 Ethernet repeater. The expansion connections allow
a more “modular” architecture to extend per-port SNMP management
functionality at a low incremental cost.

Because the IEEE sets a limit of four Ethernet repeaters between any two
stations, traditional workgroup hubs cascaded together to form larger segments
typically run into this configuration limitation. With the System 2000 hubs, all
of the expansion-connected hubs within the cluster support distributed
retiming, allowing the whole cluster to remain as one logical repeater. The
System 2000 hubs support up to 80 users in an expansion cluster.

893-743-A 1-3

Overview of the Model 281xSA Hub

Management Functions in the Model 281xSA Hubs

The Model 281xSA hubs are part of a family of Ethernet SA management
products that provide Advanced Analyzer functionality across the range of
connectivity product families. In these products, dedicated hardware for pack et
capture and analysis frees the network interface to run SNMP communication
under conditions of extreme network load. This “probe in a hub” architecture
brings high-power RMON and RMON+ monitoring and analysis capability
into the workgroup environment.

Dedicated Data Collection

The Model 281xSA hub incorporates SynOptics-developed application-specific
integrated circuit (ASIC) technology for packet capture and analysis. Called the
LANIP chip, this chip works as a data collection engine and is designed to
offload the main network management CPU from maintaining CPU-intensive
network statistics. The LANIP chip monitors all incoming packets and records
selected statistics in realtime on a per-port basis. The programmable packet
slices are moved to a shared buffer that the agent can access for management.

SNMP-based Management

The Model 281xSA hub implements SNMP, the standard communications
protocol that simplifies the management of network devices linked together
in a multivendor networking environment. SNMP agents reside in network
devices and respond to queries sent by network management software running
on a management station. The management station collates the results of these
queries and presents them graphically on the management station display.

In the Model 281xSA hub, the network management board gathers con­figuration and control data across the cascade network management interface
(CNMI) bus and uses the LANIP chip to gather network-le vel performance and
control data. Then the network management board forwards the data to a
network management station, where network managers can use the data for
network planning and for diagnostic operations.

Refer to your network management system documentation for more
information on this level of network management capability.

1-4 893-743-A

Management Functions in the Model 281xSA Hubs

Agent Software

The agent software resident on the Model 281xSA hub uses the information
collected by the LANIP chip to provide full management for the network
segment to which it is connected. The basic role of the agent software is to:

■ Gather statistics on network communications and activities.

■ Analyze and reduce the statistics and store them locally.

■ Communicate with the management station to transfer the collected

statistics; provide configuration, status, and control information; or act on
requests from the management station.

Teamed with the SynOptics network management software—or other SNMP­compatible network management software—the network management agent
allows you to observe and configure the following items:

■ Flow and quality of network data

■ Network topology

■ Physical components, such as cables and hubs

■ Faults, errors, and hardware status

This level of network management also enables you to detect and correct
network faults, as well as to isolate, monitor, and reconfigure specific network
branches.

The Model 281xSA hubs store the agent software in onboard flash memory.
This feature allows software upgrades to be handled over the network from a
central management station and eliminates the physical swapping of ROMs.
The Model 281xSA hubs support both IP and IPX network management. IPX
support enables network managers to install and manage Model 281xSA hubs
in Novell Netware environments without needing to learn and administer IP
networking principles.

MIB-II

MIB-II allows any vendor’s network management station to query important
system configuration information, as well as IP and SNMP counters and
statistics. The Model 281xSA hub supports MIB-II groups including system,
interfaces, address translation, IP, ICMP, UDP, and SNMP.

893-743-A 1-5

Overview of the Model 281xSA Hub

Support for SynOptics Optivity Features

The Model 281xSA hubs are fully compatible with network management
functions provided by the SynOptics Optivity network management software.
In particular, the Model 281xSA hubs support the Expanded View™,
Autotopology™, Show Nodes/Find Nodes, and Allo wed Nodes features. These
hubs also allow the network administrator to set various thresholds for error
counters.

Expanded View

Expanded View offers extensi v e Ethernet fault, configuration, and performance
management from anywhere in the network.

Autotopology

Autotopology provides accurate realtime display of the physical layout of the
network by detecting and reporting all network management modules located
on the network. Model 281xSA hubs also provide IPX Autotopology in
addition to standard IP Autotopology.

The details of Autotopology vary according to the platform on which the
Optivity software is running. Consult the publications that were shipped with
your Optivity software for more information.

Show Nodes/Find Nodes

The Show Nodes command is an Optivity feature that displays a window
showing all the nodes in the current view and in an y sub vie ws. The Find Nodes
command is an Optivity feature that displays a window you can use to locate an
object by its name or media access control (MAC) address.

Allowed Nodes Security

The Allowed Nodes security feature prevents unauthorized nodes from
accessing the network. This node security function consists of the Intrusion
Control feature and the Allowed Nodes list.

Intrusion Control specifies whether or not the network management agent
should look for unauthorized addresses, and what action to take when one is
detected. This security feature can be applied at the hub, slot, or port level.

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Management Functions in the Model 281xSA Hubs

The Allowed Nodes list contains the MAC addresses of devices that are
allowed to send packets into the hub. Each address has a slot and port
assignment. Using zero as the slot or port number indicates that the address
is allowed on any port in the hub or slot, respectively.

Thresholds

User-configurable thresholds on individual isolating or nonisolating errors,
connection status, and use can be set per port, per hub, or on the entire segment.
The 281xSA agent software supports up to 288 thresholds per hub, allocated
any way the administrator chooses. Thresholds can be applied to any error
counts kept by the LAN interfaces or host modules.

Model 281xSA hubs can also be configured with “ratio” thresholds that allow
settings for the ratio of bad packets, network errors, or collisions to good
packets. The hubs further support additional threshold types such as rate
gauges.

Service Port Management

The service port, located on the front panel of the Model 281xSA hub, provides
a serial communication link to the hub. By connecting a terminal to this port,
you can change the boot and run-time configuration parameter values for the
network management functions in the hub.

For more information on connecting to the service port to manage network
management modules, refer to “Using the Service Port” in Chapter 4,
“Configuring the Model 281xSA Hub for IP/IPX Networks.”

For more information on setting boot and run-time configuration parameters,
refer to Chapter 4, “Configuring the Model 281xSA Hub for IP/IPX
Networks.”

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Chapter 2 Installing the Model 281xSA Hub

This chapter describes how to install the Model 281xSA hub. This chapter
includes information on the following topics:

■ Preparing the installation site

■ Unpacking the equipment

■ Installing the hub on a table or shelf

■ Attaching wall-mounting brackets and installing the hub on a wall

■ Attaching rack-mounting brackets and installing the hub in an equipment

rack

NOTE: Only qualified technicians should install and maintain this

equipment.

Site Preparation

If you have ordered additional memory for your Model 281xSA hub, it is a
good idea to install the new SIMM before you proceed with the hub
installation. You can upgrade the memory on the Model 281xSA hub at any
time, but you must open the hub cabinet to gain access to the SIMM socket.
For instructions on installing SIMMs, see Appendix I, “Replacing SIMMs.”

Before you begin installing the Model 281xSA hub, prepare the installation
site. Evaluate the operating environment and make sure the location meets the
physical requirements of the chassis.

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Installing the Model 281xSA Hub

Operating Environment Requirements

Make sure the area where you intend to install the Model 281xSA hub provides
the following environmental conditions:

■ Temperature

– Ambient temperature between 5° and 40° C (41° and 104° F)
– No nearby heat sources such as direct sunlight, warm air exhausts, or

heaters

■ Humidity

– Between 5% and 85% noncondensing

■ Ventilation

– Minimum 2 inches on all sides for cooling
– Adequate airflow in room or wiring closet

■ Operating conditions

– At least 6 feet to nearest source of electromagnetic noise (such as

photocopy machine or arc welder)

– No dust

Physical Location Requirements

There are certain physical requirements for installing the Model 281xSA hub,
whether you are installing the hub on a table, in a rack, or on a wall. Make sure
your location meets the following requirements:

■ Service access

– Minimum 12 inches front and rear for service access and maintenance
– Front and rear clearance for cables and wiring hardware such as

punchdown blocks

■ Power

– Adequate power source within 6 feet

■ Table installation requirements

– Approximately 10-inch by 18-inch area on a level tabletop or shelf
– Support for at least 10 pounds

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■ Rack installation requirements

■ Wall installation requirements

■ Wiring hardware

Package Contents

Before you begin installing the Model 281xSA hub, check to see that you have
the following items (see Figure 2-1):

Package Contents

– Standard 19-inch EIA equipment rack
– One and one-half EIA spaces available for each Model 281xSA hub

– Half-inch plywood (minimum size of 6 inches by 20 inches) secured to

the wall where you plan to attach the hub

– Wiring hardware, such as punchdown blocks or patch panels, in place

before installing the hub

■ Model 281xSA Ethernet Hub

■ Two rack-mounting brackets

■ Two wall-mounting brackets

■ Installation hardware:

– Five #4-40 x 5/16 flat-head Phillips screws for attaching mounting

brackets (one extra)

– Four #10-32 x 3/4 pan-head Phillips screws and n ylon washers for rack

mounting

■ Power cord

■ This user’s guide

■ Release notes

■ Warranty card

CAUTION: The power cord is a North American type, UL-listed/CSA-certified

power supply cord. Immediately discar d this cor d if it is inappr opriate for your
country’s electrical system, and obtain the proper cord as required by your
national electrical codes or ordinances.

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Installing the Model 281xSA Hub

µP FaultOn Line

NM

Power

Control

Isolate Data (Data) Col

AUI Port

User's Guide

Expansion

Int

2345

System Operation

Reset

Link Part

AUI

1 2 3 4 5 6 7 8 910111213141516

Partition

MDI-X/MDI

RS-232 Service Port

MDI-X

Warranty

Screws

&

Feet

Figure 2-1. Model 281xSA hub package contents

If any listed items are missing or damaged, contact the sales or customer
service representative from whom you purchased your Model 281xSA hub.

Required Tools and Materials

To install the Model 281xSA hub, you need the following tools and materials:

■ #1 Phillips screwdriver for attaching mounting brackets

■ #2 Phillips screwdriver for tightening rack-mounting screws

■ For wall installation:

– Piece of plywood approximately 6 inches by 20 inches

(minimum 1/2 inch thick)
– Drill
– Four #12 x 5/8 pan-head Phillips sheet metal screws

■ Antistatic mat and wrist strap (attached to an antistatic leash) to protect

electronic components from static electricity damage

4640

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Table or Shelf Installation

To install the Model 281xSA hub on a table or shelf, follow these steps:

1. Peel off the protective backing from the rubber feet and apply one at
each marked location on the bottom of the hub (see Figure 2-2).

Figure 2-2. Attaching feet

Table or Shelf Installation

Feet placement
guides

4642

2. Set the hub on a table or shelf so that it has at least 2 inches of space
on all sides.

3. Connect the power cord, first to the power entry receptacle on the
back of the hub (see Figure 2-3) and then to the wall.

EXPANSION 2EXPANSION 3EXPANSION 4EXPANSION 5

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Figure 2-3. Connecting the power cord

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