Cabletron Systems MRXI-22 User manual

MRXI-22 AND MRXI-24
10BASE-T HUB
USER’S GUIDE
CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03867-5005
The Complete Networking Solution™

i
NOTICE
Cabletron Systems reserves the right to make changes in specifications and other information
contained in this document without prior notice. The reader should in all cases consult Cabletron
Systems to determine whether any such changes have been made.
The hardware, firmware, or software described in this manual is subject to change without notice.
IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FORANY INCIDENTAL,
INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT
NOT LIMITED TO LOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR
THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN
ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH
DAMAGES.
© Copyright May 1993 by:
Cabletron Systems Inc.
P.O. Box 5005, Rochester, NH 03867-5005
All Rights Reserved
Printed in the United States of America
Order Number: 9030637-01 May 93
Remote LANVIEW , LANVIEW , and SPECTRUM are registered trademarks of Cabletron
Systems, Inc.
MRXI and MMAC are trademarks of Cabletron Systems, Inc.
IBM is a registered trademark of International Business Machines Corporation.
CompuServe is a registered trademark of CompuServe.
DEC , VT200 , and VT300 are trademarks of Digital Equipment Corporation.
Ethernet is a trademark of Xerox Corporation.
Hayes is a trademark of Hayes Microcomputer Products Inc.
Windows is a registered trademark of Microsoft Corporation

NOTICE
ii
FCC NOTICE
This device complies with Part 15 of the FCC rules. Operation is subject to the following two
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.
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 uses, generates, and can radiate radio frequency energy and if not installed in accordance
with the operator’s manual, may cause harmful interference to radio communications. Operation of
this equipment in a residential area is likely to cause interference in which case the user will be required
to correct the interference at his own expense.
WARNING : Changes or modifications made to this device which are not expressly approved by the
party responsible for compliance could void the user’s authority to operate the equipment.
DOC NOTICE
This digital apparatus does not exceed the ClassA limits for radio noise emissions from digital
apparatus set out in the Radio Interference Regulations of the Canadian Department of
Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables
aux appareils numériques de la class A prescrites dans le Règlement sur le brouillage radioélectrique
édicté par le ministère des Communications du Canada.

iii
CONTENTS
CHAPTER 1 INTRODUCTION
1.1 USING THIS MANUAL................................................................1-1
1.2 GETTING HELP..........................................................................1-2
1.3 THE 10BASE-T MRXI .................................................................1-2
1.4 LANVIEW LEDs AND LCD DISPLAY..........................................1-4
1.5 LOCAL MANAGEMENT..............................................................1-4
1.6 NETWORK MANAGEMENT CAPABILITIES..............................1-4
1.7 RELATED MANUALS..................................................................1-5
CHAPTER 2 INSTALLATION
REQUIREMENTS/SPECIFICATIONS
2.1 NETWORK REQUIREMENTS....................................................2-1
2.2 SELECTING A LOCATION FOR THE MRXI...............................2-1
2.3 NETWORK GUIDELINES ...........................................................2-2
2.3.1 10BASE-T Twisted Pair Network Requirements ............2-2
2.3.2 Multi Mode Fiber Optic Network Requirements..............2-3
2.3.3 Single Mode Fiber Optic Network Requirements............2-4
2.3.4 Thin-Net Network Requirements ....................................2-5
2.3.5 Transceiver Requirements..............................................2-6
2.3.6 AUI Cable Requirements................................................2-6
2.4 OPERATING SPECIFICATIONS ................................................2-7
CHAPTER 3 INSTALLATION
3.1 UNPACKING THE MRXI.............................................................3-1
3.2 ATTACHING THE STRAIN RELIEF BRACKET..........................3-1
3.3 INSTALLING THE MRXI .............................................................3-2
3.3.1 Rack Mounting the MRXI................................................3-2
3.3.2 Wall Mounting the MRXI.................................................3-3
3.3.3 Free-Standing Installation...............................................3-5
3.4 CONNECTING THE MRXI TO THE POWER SOURCE.............3-6
3.5 CONNECTING THE MRXI TO THE NETWORK.........................3-6
3.5.1 Connecting the Network Port Cabling.............................3-7
3.5.2 Connecting a Twisted Pair Segment to an EPIM-T ........3-8
3.5.3 Connecting an AUI Cable to an EPIM-X.......................3-10
3.5.4 Connecting a Fiber Optic Link Segment to an
EPIM-F1, EPIM-F2, or EPIM-F3...................................3-11
3.5.5 Connecting a Thin-Net Segment to an EPIM-C............3-13
3.5.6 Connecting an AUI Cable to an EPIM-A.......................3-14
3.6 FINISHING THE INSTALLATION..............................................3-15

CONTENTS
iv
CHAPTER 4 TESTING ANDTROUBLESHOOTING
4.1 INSTALLATION CHECK-OUT.....................................................4-1
4.2 TESTING SEGMENTS ATTACHED TO THE MRXI....................4-2
4.3 USING LANVIEW ........................................................................4-5
4.4 THE LCD DISPLAY .....................................................................4-6
CHAPTER 5 LOCAL MANAGEMENT
5.1 TERMINAL CONFIGURATION....................................................5-1
5.1.1 Console Cable Configuration ..........................................5-3
5.1.2 Modem Cable Configuration............................................5-5
5.1.3 Cable Configuration for UPS...........................................5-5
5.2 ACCESSING LOCAL MANAGEMENT ........................................5-6
5.3 COMMUNITY NAME TABLE.......................................................5-7
5.3.1 Accessing the Community Name Table Screen..............5-8
5.3.2 Community Name Table Screen Fields...........................5-8
5.3.3 Editing the Community Name Table Screen...................5-9
5.4 CONFIGURING THE MRXI .......................................................5-10
5.4.1 Accessing the Configuration Screen.............................5-10
5.4.2 Configuration Screen Fields..........................................5-11
5.4.3 Setting the IP Address Table and SubNET Mask Field.5-12
5.4.4 Setting the Default Gateway..........................................5-13
5.4.5 Setting the UPS Option.................................................5-13
5.4.6 Using the Port LOCK Override Option ..........................5-14
5.4.7 Using the Port ENABLE Override..................................5-14
5.5 SETTING THE TRAP TABLE ....................................................5-15
5.5.1 MRXI Trap Table Screen...............................................5-15
5.5.2 Trap Table Screen Fields..............................................5-16
5.5.3 Configuring the Trap Table............................................5-16
5.6 SNMP TOOLS ...........................................................................5-17
5.6.1 Accessing the SNMP Tools Screen ..............................5-18
5.6.2 SNMP Tools Screen Fields...........................................5-18
5.6.3 Using SNMP Tools........................................................5-19
5.7 COMMAND LINE INTERFACE (CLI).........................................5-22

1-1
CHAPTER 1
INTRODUCTION
Welcome to the Cabletron Systems MRXI-22 and MRXI-24 10BASE-T
HUB User’s Guide
. This manual provides installation instructions and
presents reference information for the MRXI-22 and MRXI-24
10BASE-T Hubs.
Note :Throughout this manual the term MRXI is used to cover both the
MRXI-22 and MRXI-24 unless otherwise specified.
1.1 USINGTHIS MANUAL
Read through this manual completely to familiarize yourself with its
content and to gain an understanding of the features and capabilities of
the MRXI. A general working knowledge of Ethernet and IEEE 802.3
type data communications networks and their physical layer components
will be helpful when installing the MRXI.
Chapter 1,
Introduction , outlines the contents of this manual, briefly
describes features of the MRXI, and concludes with a list of related
manuals.
Chapter 2,
Requirements/Specifications , describes installation
requirements, network guidelines, and MRXI operating specifications.
Chapter 3, Installation , contains instructions for installing your MRXI
and connecting it to the network using the various media types.
Chapter 4, Testing and Troubleshooting, contains procedures for testing
the MRXI after installation, a description of the LANVIEW ™ LEDs, and
explains the use of the front panel LCD display.
Chapter 5,
Local Management, describes how to access Local
Management. It also describes each of the Local Management screens and
the available commands.

INTRODUCTION
1-2
1.2 GETTING HELP
If you need additional support related to the MRXI-22 or MRXI-24, or if
you have any questions, comments, or suggestions concerning this
manual, feel free to contact Cabletron Systems Technical Support:
By phone ..........................[phone]
Monday-Friday; 8am - 8pm EST
By CompuServe
®
.............GO CTRON from any ! prompt
By Internet mail ...............[email protected]
1.3 THE 10BASE-T MRXI
The MRXI-22 and MRXI-24 are functionally identical. The MRXI-22
provides twelve RJ-45 connectors and the MRXI-24 provides twenty-four
RJ-45 connectors for network ports. Additional network connections are
made through the use of front panel EPIM modules (one module for the
MRXI-22, two modules for the MRXI-24). A variety of EPIMs are
available permitting the expansion of an Ethernet/802.3 network via:
• Unshielded Twisted Pair Cable from the 10BASE-T Twisted Pair
Interface Module (EPIM-T).
• Fiber Optic Cable, with SMA or ST connectors, from the Fiber Optic
Interface Modules (EPIM-F1, EPIM-F2 or EPIM-F3).
• Thin-Net Cable from the Coaxial Interface Module (EPIM-C).
• AUI Cable from the AUI Interface Module (EPIM-A or
EPIM-X).
Figure 1-1 The MRXI-24
MRXI-24
10BASE-T HUB with LANVIEW
The Complete Networking Solution

INTRODUCTION
1-3
The MRXI fully conforms to the IEEE 802.3 Repeater, AUI, and
10BASE-T specifications, and provides the flexibility to connect
networks using IEEE 802.3, EthernetVersion 1 orVersion 2 equipment.A
Repeater Interface Controller (RIC) in the MRXI provides full 802.3
repeater capabilities integrated into a single chip. The MRXI transmits
re-timed data packets, regenerates the preamble, extends fragments, and
arbitrates collisions.
The MRXI automatically partitions problem segments, and reconnects
non-problem segments to the network. This feature minimizes the impact
on network operation resulting from a problem on one segment by
isolating the problem segment. Only devices on the problem segment are
affected.When the problem is solved, the MRXI automatically reconnects
the isolated segment to the network.
Since the MRXI utilizes polarity detection and correction, the twisted pair
connections are not sensitive to signal polarity. The network will still
function properly with the (+) and (–) lines within a pair reversed.
Operating in this condition is not recommended and if this condition is
discovered, the segment should be removed from the network and wired
correctly by a technician. This reduces the potential for problems in the
future if equipment changes are made. Connector pinouts are provided in
Chapter 2,
Installation Requirements / Specifications .
You can configure the two front panel serial ports to support an SNMP
proxy for Uninterruptible Power Supplies (UPS) or the Serial Line
Internet Protocol (SLIP). MIB II and RMON support are built into the
MRXI for network analyzer functionality. In addition, Cabletron’s
Distributed LAN Monitor (DLM), a software option for the MRXI,
provides a method for locally polling and monitoring devices on a LAN to
minimize network management traffic on an enterprise, campus, or wide
area network.
The MRXI uses Flash EEPROMs that allow you to download new and
updated firmware using Cabletron Systems Remote
LANVIEW/Windows, version 2.3 or later or any device using BOOTP or
TFTP protocols.
The front panel of the MRXI also has a reset switch to initialize the
processor.

INTRODUCTION
1-4
1.4 LANVIEW LEDS AND LCD DISPLAY
Cabletron Systems’LANVIEW Status Monitoring and Diagnostics
System is a convenient troubleshooting tool that helps you diagnose
power failures, collisions, cable faults, and link problems.
The front panel LCD display provides information about the MRXI such
as power up diagnostics, revision levels, MAC and IP addresses, and error
alerts.
1.5 LOCAL MANAGEMENT
There are two RJ-45 ports on the front panel of the MRXI that let you
access Local Management by connecting a DEC VT
™
320 terminal or a
PC using VT320 emulation software. Refer to Chapter 5,
Local
Management
.
1.6 NETWORK MANAGEMENT CAPABILITIES
The MRXI can be controlled and managed by any SNMP network
management system. These include:
• Cabletron Systems SPECTRUM
®
• Cabletron Systems Remote LANVIEW
®
/Windows
™
• Cabletron Systems Remote LANVIEW
®
for SunNet
™
Manager
• Third Party SNMP compliant Network Management Packages
The MRXI network management capabilities provide the necessary
management tools for the MRXI to operate at its full capacity.Your ability
to set up parameters with network management ensures optimal
performance of the MRXI.
For example, you can gather a large amount of statistical information
about the MRXI, including the number of:
• Packets • Receive Collisions
• Transmit Collisions • Giant Packets
• Runt Packets • Misaligned Packets
• CRC Errors • Out of Window Collisions
• Bytes Received