Cabletron Systems MRXI-22, MRXI-24 User Manual

MRXI-22 AND MRXI-24

The Complete Networking Solution™

10BASE-T HUB

USER’S GUIDE

CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03867-5005

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 FOR ANY 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

Systems, Inc.

MRXI

and

MMAC

IBM

is a registered trademark of International Business Machines Corporation.

CompuServe

DEC, VT200
Ethernet

Hayes
Windows

is a trademark of Xerox Corporation.

is a trademark of Hayes Microcomputer Products Inc.

is a registered trademark of Microsoft Corporation

are trademarks of Cabletron Systems, Inc.

is a registered trademark of CompuServe.

, and

VT300

, and

SPECTRUM

are trademarks of Digital Equipment Corporation.

are registered trademarks of Cabletron

i

NOTICE

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:

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

party responsible for compliance could void the user’s authority to operate the equipment.

This equipment has been tested and found to comply with the limits for a Class A digital

: Changes or modifications made to this device which are not expressly approved by the

DOC NOTICE

This digital apparatus does not exceed the Class A 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.

ii

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

iii

CONTENTS

CHAPTER 4 TESTING AND TROUBLESHOOTING

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

iv

CHAPTER 1

INTRODUCTION

Welcome to the Cabletron Systems

HUB User’s Guide

. This manual provides installation instructions and

MRXI-22 and MRXI-24 10BASE-T

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 USING THIS 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

describes features of the MRXI, and concludes with a list of related
manuals.

, outlines the contents of this manual, briefly

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 T r oubleshooting,

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.

1-1

INTRODUCTION

MRXI-24

10BASE-T HUB with LANVIEW

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 [e-mail]

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).

The Complete Networking Solution

Figure 1-1 The MRXI-24

1-2

INTRODUCTION

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, Ethernet Version 1 or Version 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.

1-3

INTRODUCTION

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, re vision lev els, MA C 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
PC using VT320 emulation software. Refer to Chapter 5,

Management

.

320 terminal or a

Local

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

®

™

1-4

INTRODUCTION

For specific information, refer to the applicable network management
package user’s manual.

1.7 RELATED MANUALS

Use the following manual to supplement the procedures and other
technical data provided in this manual. The procedures contained in the
following manual are referenced where appropriate, but not repeated in
this manual.

Cabletron Systems

LAN-MD Portable Ethernet Tester

User's Manual.

1-5

INTRODUCTION

1-6

CHAPTER 2

INSTALLATION

REQUIREMENTS/SPECIFICATIONS

This chapter describes network guidelines, power requirements, and
operating specifications for the MRXI. Be sure that you read this chapter
before you install the MRXI. Your network must meet the requirements
and conditions specified in this chapter to obtain satisfactory performance
from this equipment. Failure to follow these guidelines could result in
poor network performance.

2.1 NETWORK REQUIREMENTS

When connecting a network segment to the MRXI, via a transceiver and
an AUI cable, the following network requirements must be met:

• The transceivers used to connect the MRXI meet Ethernet Version 2 or

IEEE 802.3 standards.

• The AUI cables connecting the MRXI to the transceivers on the

network match the transceiv er type on the netw ork se gment, Ethernet
Version 1, Version 2, or IEEE 802.3 type cables, and do not exceed 50
meters in length.

2.2 SELECTING A LOCATION FOR THE MRXI

You can mount the MRXI on a wall, a 19-inch rack, or place it on any
horizontal surface. If you choose not to install the MRXI in a 19-inch
rack, the location must be within reach of the network cabling and meet
the requirements listed below:

• An unrestricted free surface area at least 21 inches wide, 18 inches

deep, and 6 inches high is needed.

• A single phase 120 Vac, 15A, grounded power receptacle must be

located within 7 feet of the location.

• If you use a shelving unit, it must be able to support 30 pounds of static

weight.

• The temperature for the selected location must be maintained between

°

and 50°C, and fluxuate less than 10°C per hour.

5

2-1

INSTALLATION REQUIREMENTS/SPECIFICATIONS

2.3 NETWORK GUIDELINES

Take care in planning and preparing the connections and the cables for
your network. The quality of the connections, the length of the cables, and
the location of the MRXI are critical factors in determining the reliability
of your network. The following sections describe the network guidelines
to operate this equipment.

2.3.1 10BASE-T Twisted Pair Network Requirements

The device at the other end of the twisted pair segment must meet IEEE

802.3 10BASE-T specifications. When you connect a 10BASE-T T wisted

Pair Segment to the MRXI’s 10BASE-T Twisted Pair Ports, the following
network requirements must be met:

Length

•
10BASE-T devices transmit over a

- The IEEE 802.3 10BASE-T standard requires that

100 meter

(328 foot) link using
22-24 AWG unshielded twisted pair wire. As a general rule, links up
to 130 meters in length for unshielded twisted pair and 200 meters in
length for shielded twisted pair are achiev able. For each connector or
patch panel in the link, subtract 12 meters from the 150 meter limit.
This allows for links of up to 126 meters using standard 24 AWG UTP
wire and two patch panels within the link. Higher quality low
attenuation cables may be required when using links of greater than
126 meters. Due to cable delay, the maximum link length is always
limited to 200 meters, regardless of the cable type.

Insertion Loss

•

- The maximum insertion loss allowed for a
10BASE-T link is 11.5 dB at all frequencies between 5.0 and 10 MHz.
This includes the attenuation of the cables, connectors, patch panels,
and reflection losses due to impedance mismatches in the link
segment.

Impedance

•

- Unshielded twisted pair cables typically have an
impedance of between 85 to 110 ohms. Shielded twisted pair cables,
such as IBM T ype 1 cable, can also be used. You should remember that
the impedance of IBM Type 1 cable is typically 150 ohms. This
increases the signal reflection caused by the cable, but since the cable
is shielded, this signal reflection has little effect on the received
signal’ s quality due to the lack of crosstalk between the shielded cable
pairs. Cabletron Systems 10BASE-T Twisted Pair products will work
on twisted pair cable with 75 to 165 ohms impedance.

2-2

INSTALLATION REQUIREMENTS/SPECIFICATIONS

•

Jitter

- Intersymbol interference and reflections can cause jitter in the
bit cell timing, resulting in data errors. A 10BASE-T link must not
generate more than 5.0 nsec. of jitter. If your cable meets the
impedance requirements for a 10BASE-T link, jitter should not be a
concern.

•

Delay

- The maximum propagation delay of a 10B ASE-T link segment
must not exceed 1000 nsec. This 1000 nsec. maximum delay limits the
maximum link segment length to no greater than 200 meters.

Crosstalk

•

- Crosstalk is caused by signal coupling between the
different cable pairs contained within a multi-pair cable bundle.
10BASE-T transcei v ers are designed so that the user does not need to
be concerned about cable crosstalk, provided the cable meets all other
requirements.

•

Noise -

Noise can be caused by either crosstalk or externally induced
impulses. Impulse noise may cause data errors if the impulses occur at
very specific times during data transmission. Generally, the user need
not be concerned about noise. If noise-related data errors are
suspected, it may be necessary to either reroute the cable or eliminate
the source of the impulse noise.

Temperature

•

- Multi-pair PVC 24 AWG telephone cables typically
have an attenuation of approximately 8 to 10 dB/100m at 20
F). The attenuation of PVC insulated cable varies significantly with

°

temperature. At temperatures greater than 40

C (104° F), it is strongly
recommended that you use plenum-rated cables to ensure that cable
attenuation remains within specification.

°

C (78°

2.3.2 Multi Mode Fiber Optic Network Requirements

When you connect a Fiber Optic Link Segment to the MRXI with a Single Port
Fiber Optic Interface Module (EPIM-F1 or EPIM-F2), the following network
requirements must be met:

•

Cable T ype

one of the following multimode fiber optic media:

- 50/125

- 62.5/125

- 100/140

- The EPIM-F1 and EPIM-F2 are designed for use with

µ

m fiber optic cabling.

µ

µ

m fiber optic cabling.

m fiber optic cabling.

2-3

INSTALLATION REQUIREMENTS/SPECIFICATIONS

•

Attenuation

- The fiber optic cable must be tested with a fiber optic
attenuation test set that is adjusted for an 850 nm wavelength. This test
verifies that the signal loss in a cable is within an acceptable level:

- 13.0 dB or less for 50/125 fiber cable segment.

- 16.0 dB or less for 62.5/125 fiber cable segment.

- 19.0 dB or less for 100/140 fiber cable segment.

Budget and Propagation Delay

•

- When determining the maximum
fiber optic cable length, the fiber optic budget delay and total network
propagation should be calculated and taken into consideration before
fiber optic cable runs are incorporated in any network design. Fiber
optic budget is the combination of the optical loss due to the fiber optic
cable, in-line splices, and fiber optic connectors. Propagation delay is
the amount of time it takes a packet to travel from the sending device
to the receiving device.

•

Length

- The maximum allowable fiber optic cable length is
2 km. Howe ver, IEEE 802.3 specifications allow for a maximum of 1
km.

2.3.3 Single Mode Fiber Optic Network Requirements

When you connect a Single Mode Fiber Optic Link Segment to the MRXI
with a Fiber Optic Ethernet Port Interface Module (EPIM-F3), the
following network requirements must be met:

µ

• The fiber optic link segment should consist of 8/125 - 12/125

µ

single mode

m fiber optic cabling. You can also use 62.5/125 µm

m

multi mode cable, howe ver optical loss will be greater with multi mode
cable and distances will be limited to 2 km.

• The fiber optic cable must be tested with a fiber optic attenuation test
set that is adjusted for a 1300 nm wave length. This test verifies that
the signal loss in a cable is within an acceptable level of 10.0 dB or less
for any given single mode fiber optic link.

• When determining the maximum fiber optic cable length, the fiber
optic budget (total loss of 10.0 dB or less between stations) and total
network propagation delay should be calculated and considered before
fiber runs are incorporated in any network design.

2-4

INSTALLATION REQUIREMENTS/SPECIFICATIONS

• Fiber optic budget is the combination of the optical loss due to the fiber

optic cable, in-line splices, and fiber optic connectors (the loss for each
splice and connector is typically 1 dB or less).

• Propagation delay is the amount of time it takes a packet to trav el from

the sending device to the receiving device. Total propagation delay

µ

allowed for the entire network is 25.6
delay between any two nodes on the network e xceeds 25.6

sec. If the total propagation

µ

sec, then

bridges should be used.

• When using single mode fiber optic cable, segment lengths up to 10

km are possible if system budgets are met. However, IEEE 802.3
FOIRL specifications allow for a maximum length of 1 km.

2.3.4 Thin-Net Network Requirements

When you connect a Thin-net segment to the MRXI with a Coax Interface
Module (EPIM-C), the following network requirements must be met:

•

Cable T ype

- 50 ohm RG-58A/U type coaxial cable must be used

when making up a thin-net cable segment.

•

Length

•

Terminations

- The thin-net segment must be no longer than 185 meters.

- A 50 ohm terminator must be connected to the far end

of each thin-net segment.

•

Connections

- A maximum of 29 tee-connectors may be used
throughout the length of cable segment for host connections. If an
excessive number of barrel connectors are used within the cable
segment, such as finished wall plates with BNC feed-throughs, then a
reduced number of host connections may be required. For special
network design, contact Cabletron Systems Technical Support.

Grounding

•

- For safety, only one end of a thin-net segment should be
connected to earth ground. Connection to earth ground at more than
one point on the segment could produce dangerous ground currents.
The BNC ports of the Coaxial Interface Modules are not connected to
earth ground.

Warning

ground. Only one end of the shield should be connected to earth ground.
Multiple ground paths can introduce noise or a hazardous voltage
potential onto the cable.

: Do not connect the shield at both ends of a thin net segment to

2-5

INSTALLATION REQUIREMENTS/SPECIFICATIONS

2.3.5 Transceiver Requirements

When you connect an external network segment, via a transceiver, to the
MRXI with an EPIM-A, the following requirements must be met:

• The transceiver or Ethernet Device to which the module will be
connected must meet IEEE 802.3 standards, and/or Ethernet Version

1.0 or Version 2.0 standards.

• The Signal Quality Error (SQE) test function on the transceiver must
be disabled if you connect it to a repeater or to an Ethernet Version 1.0
device. In addition, some Version 2.0 equipment does not support the
SQE test. Devices that do not support SQE test interpret the SQE test
pulse as a collision.

2.3.6 AUI Cable Requirements

When you connect an external network segment to the MRXI with an
EPIM-A or EPIM-X, the AUI cable must meet the following
requirements:

AUI Cable

•

- The AUI cable connecting the module to a device must

be IEEE 802.3 type cable.

•

Length - The AUI Cable must not exceed 50 meters in length. If 28
AWG thin office drop AUI cable is used, then the maximum cable
length is limited to 50 feet (15.24 meters).

• Grounding - The connector shell of the EPIM-A and the EPIM-X are
connected to ground.

2-6

INSTALLATION REQUIREMENTS/SPECIFICATIONS

2.4 OPERATING SPECIFICATIONS

The operating specifications for the MRXI are described in this section.
Cabletron Systems reserves the right to change these specifications at any
time without notice.

GENERAL

Operating System Memory: 4 MB
Internal Processor: Intel 80C960CA operating at

24 MHz

Ethernet Controller: National Semiconductor

DP83932
Static RAM: 128 KB with battery back-up
EPROM: 128 KB
FLASH MEMORY: 2 MB

Delay Times (Start of Packets):

Twisted Pair to EPIM- A 900 nsec.
Twisted Pair to Twisted Pair 1 msec.
EPIM-A to Twisted Pair 750 nsec.

Delay Times (JAM):

Twisted Pair to EPIM-A 1.16 msec.

Preamble:

Input: Minimum of 40 bits required.
Output: 64 bits min. (last 2 bits are 1, 1).

2-7

INSTALLATION REQUIREMENTS/SPECIFICATIONS

JAM Output: Collisions are propagated through the

network using the JAM signal of an
alternating pattern of 1's and 0's in
accordance with 802.3 specifications for a
repeater unit.

Fragment Extension: Packet fragments are extended to a

minimum of 96 bits using the JAM [1,0].

Fault Protection: Each segment will disconnect itself from

the other segments if 31 consecutive
collisions occur, or if the collision detector
of a segment is on for longer than
approximately 110 µs. This fault
protection will reset automatically after
one packet is transmitted/receiv ed onto the
fault protected segment without causing a
collision.

INTERFACE CONNECTORS

Network (Twisted Pair) Interface

Type: Internally Crossed Over RJ-45 Connector

Pin-out for RJ-45 Connector
Pin 1 RX+ 5 No Connection

2 RX- 6 TX­3 TX+ 7 No Connection
4 No Connection 8 No Connection

2-8

INSTALLATION REQUIREMENTS/SPECIFICATIONS

Ethernet Port - EPIM-T (10BASE-T Twisted pair Port)

Internal Cabletron Systems TPT-T™ 10BASE-T Twisted
Transcei v er: Pair T ranscei v er

Type: Pin RJ-45 Connector
The slide switch on the EPIM-T determines if the cable pairs are

internally swapped in the module. If the switch is on the X side, the
pairs are swapped. If the switch is on the II side, the pairs are not
internally swapped.

Pin-outs for RJ-45 connector

Position II (not crossed over) Position X (crossed over)
1 TX+ 5 NC 1 RX+ 5 NC

2 TX- 6 RX- 2 RX- 6 TX­3 RX+ 7 NC 3 TX+ 7 NC
4NC 8NC 4NC 8NC

Ethernet Port - EPIM-F1 or EPIM-F2 (Fiber Optic Port)

Internal Cabletron Systems FOT-F™ Fiber Optic
Transceiver: Transceiver

Type: EPIM-F1 (SMA fiber optic ports)

EPIM-F2 (ST fiber optic ports)

Parameter Typical Worst Worst Case Typical

Value Case Budget Budget

Receive
Sensitivity: -30.5 dBm -28.0 dBm — —

Peak Input
Power: -7.6 dBm -8.2 dBm — —

2-9

INSTALLATION REQUIREMENTS/SPECIFICATIONS

Parameter Typical Worst Worst Case Typical

Value Case Budget Budget

Transmitter Power
50/125 µm

fiber: -13.0 dBm -15.0 dBm 13.0 dB 17.5 dB

62.5/125 µm
fiber: -10.0 dBm -12.0 dBm 16.0 dB 20.5 dB

100/140 µm
fiber: -7.0 dBm -9.0 dBm 19.0 dB 23.5 dB

Error Rate: Better than 10

Note: The transmitter power levels and receive sensitivity levels listed
above are Peak Power Levels after optical overshoot. A Peak Power
Meter must be used to correctly compare the values giv en abo v e to those
measured on any particular port. If P o wer Le vels are being measured with
an Av erage Power Meter, then 3 dBm must be added to the measurement
to correctly compare those measured values to the values listed above
(i.e. -30.5 dBm peak=-33.5 dBm average).

-10

Ethernet Port - EPIM-F3

Internal
Transceiver: Cabletron Systems FOT-F3™ Fiber Optic Transceiver

Type: ST fiber optic ports.

Note: Transmitter Power decreases as temperatures rise and increases
as temperatures fall. Use the Output Power Coefficient to calculate
increased or decreased power output f or y our oper ating environment. For
example, the typical power output at 25° C is -16.4 dBm. For a 4° C
temperature increase, multiply the typical coefficient (-0.15 dBm) by four
and add the result to typical output power (4 x -0.15 dBm + -16.4 = -17.0).

2-10

Receive

C

Sensitivity

Maximum

Receive

Input Power

INSTALLATION REQUIREMENTS/SPECIFICATIONS

Maximum Sensitivity (-36.0)

Typical Sensitivity (-31.0)
Minimum Sensitivity (-30.0)

Minimum Receive Input (-9.72)

Typical Receive Input (-7.5)
Maximum Receive Input (-6.99)

Transmitter Power*

(At 25°C into

8.3/125µm fiber)

* Transmit Power Typical Power Minimum Power Maximum Power
Coefficient
(See Note Below)-0.15dBm/ °C  -0.12 dBm/ °C-0.18 dBm/ °

dBm

Less Power

-40 -35 -30 -25 -20 -15 -10 -5 0

Maximum Transmit Power (-12.0)

Typical Transmit Power (-15.5)

Minimum Transmit Power (-21.0)

More Power

Parameter Typical Minimum Maximum

Transmitter Peak
Wave Length 1300 nm 1270 nm 1330 nm

Spectral Width 60 nm - 100 nm
Rise Time/ 3.0 nsec 2.7 nsec 5.0 nsec

Fall Time 2.5 nsec 2.2 nsec 5.0 nsec
Duty Cycle 50.1% 49.6% 50.7%
Bit Error Rate: Better than 10

Note: The transmitter power levels given above are Peak Power Levels
after optical overshoot. You must use a Peak Power Meter to correctly
compare the values given above to those measured on any particular
port. If you are measuring power le v els with an A v er age P o wer Meter , add
3 dBm to the average power measurement to correctly compare the
average power values measured to the values listed above (i.e. -33.5
dBm average + 3 dB = -30.5 dBm peak).

-10

2-11

INSTALLATION REQUIREMENTS/SPECIFICATIONS

Ethernet Port - EPIM-C (BNC Port)

Internal
Transcei v er: Cabletron Systems TMS-3™ Transceiv er.

Termination: The port on the module can be internally

terminated, to an internal 50 Ohm terminator,
utilizing the switch located to the left of the
port. This eliminates the need to connect the
port to a Tee Connector and terminator.

Type: BNC receptacle, with gold center contact, for

use with BNC type tee-connectors and RG-58
thin-net cable.

Grounding: For safety, only one end of a thin-net segment

should be connected to earth ground.
Connection to earth ground at more than one
point on the segment may cause dangerous
ground currents.

The BNC port of the Coaxial Interface
Modules is not connected to earth ground.

Ethernet Port - EPIM-A and EPIM-X (AUI Port)

Interface DB-15 Port (male connector for EPIM-A,
Connector: female connector for EPIM-X)

Type: 15 position D type receptacle
Pin 1 Logic Ref. 9 Collision -

2 Collision + 10 Transmit ­3 Transmit 11 Logic Ref.
4 Logic Ref. 12 Receive ­5 Receive + 13 Power (+12Vdc)
6 Power Return 14 Logic Ref.
7 No Connection 15 No Connection

Connector Shell: Protective Ground

2-12

INSTALLATION REQUIREMENTS/SPECIFICATIONS

Console Port

The RJ-45 Console port supports access to a Local Management
Console. The Console port supports a Digital Equipment
Corporation, VT 320™ terminal or PC emulation of the VT 320™
terminal.

Type: 8 pin RJ-45 Port
Pin 1 Not Used 5 Signal Ground (SG)

2 Data Terminal Ready (DTR)6 Receive Data (RX)
3 Transmit Data (TX) 7 Data Set Ready (DSR)
4 Not Used 8 Not Used

Modem Port

The RJ-45 Modem Port supports access to Local Management via a
Hayes compatible modem. You can also use this port to support an
Uninterruptible Power Supply (UPS).

Type: 8 pin RJ-45 Port
Pin 1 Transmit Data 5 Signal Ground (SG)

2 Data Carrier Detect (DCD) 6 Data Terminal Read(DTR)
3 Not Used 7 Not Used
4 Receive Data (RX) 8 Ring Detect

LANVIEW INDICATORS

PWR (green): Indicates that the repeater is receiving

power.

LNK (green): Indicates that a link has been

established between the module and
the 10BASE-T device at the other end
of the twisted pair segment. This LED
remains lit as long as the link is
maintained.

2-13

INSTALLATION REQUIREMENTS/SPECIFICATIONS

RCV (yellow): Indicates that the repeater is receiving

a data packet on that segment.

CPU (flashing green): This LED alternates from red to green

during power up. After the boot is
complete, the LED flashes green. A
flashing green LED indicates normal
operation. A red LED indicates a fault
in the processor.

POWER SUPPLY REQUIREMENTS

Note: The MRXI has a universal power supply. This unit allows y ou to use
an input power from 85 to 264 VAC, 47-63 Hz.

Parameter Typical Worst

Value Case

Input Current: 0.5 A 0.75 A
Overload Protection - Output: (1) 2AG 1 amp fuse.

ENVIRONMENTAL REQUIREMENTS

Operating Temperature: +5° to +50° C
Non-operating Temperature: -30° to +90° C
Operating Humidity: 5 to 95% (non-condensing)

SAFETY

Designed in accordance with UL478, UL910, NEC 725-2(b), CSA,
IEC, TUV, VDE class A. Meets FCC part 15, Class A limits.

Warning: It is the responsibility of the person who sells the system to
which the MRXI will be a part to ensure that the total system meets
allowed limits of conducted and radiated emissions.

2-14

INSTALLATION REQUIREMENTS/SPECIFICATIONS

SERVICE

MTBF (MHBK-217D): >70,040 hrs. projected
MTTR: < 0.5 hr.

PHYSICAL

Dimensions: 2.8H x 17.0W x 13.5D inches

(7.2 x 43.6 x 34.6 cm)

Weight: 7 lbs.

2-15

INSTALLATION REQUIREMENTS/SPECIFICATIONS

2-16

CHAPTER 3

INSTALLATION

This chapter outlines the procedure for installing your MRXI and
connecting it to a network. Ensure that your network meets the
guidelines and requirements outlined in Chapter 2, Installation
Requirements/Specifications, before installing the MRXI.

3.1 UNP ACKING THE MRXI

Unpack the MRXI as follows:

• Remove the two plastic bags containing the accessories.

• Remove the MRXI from the shipping box.

• Slide the two foam end caps off the MRXI.

• Remove the MRXI from the protective plastic bag and set it aside to
prevent damage.

Before you install the MRXI visually inspect the unit and check the
contents of the accessory package. Contact Cabletron Systems Technical
Support immediately if you find any discrepancies.

3.2 ATTACHING THE STRAIN RELIEF BRACKET

Attach the strain relief bracket to the front of the MRXI as follows:

1. Locate the strain relief bracket and four 8-32 x 3/8” screws from the
MRXI installation kit.

Warning: Use of longer screws may cause damage to the unit or
electrical shock.

2. Attach the strain relief bracket to the bottom of the MRXI as shown in
Figure 3-1.

3-1

INSTALLATION

MRXI

10 BASE-T HUB with LANVIEW

Figure 3-1 Attaching the Strain Relief

3.3 INST ALLING THE MRXI

You can mount the MRXI on a wall, a 19-inch rack, or place it
free-standing on any horizontal surface (i.e., shelf or desk, etc.). Select
one of the following subsections and perform the steps that are applicable
for your installation.

3.3.1 Rack Mounting the MRXI

Refer to Figure 3-2 and perform these steps to install the MRXI in a
19-inch rack.

1. Remove four cover screws (two from each side) located along the
front edges of each side of the MRXI.

2. Using the four cover screws removed in step 1, attach the rack
mounting brackets to each end of the MRXI.

3-2

INSTALLATION

Rackmount

Brackets (2)

MRXI 10 BASE-T HUB with LANVIEW

Screws (4)

Figure 3-2 Rack Mount Brackets Installation

3. With the mounting brackets installed, position the MRXI between the

vertical frame members of the 19-inch rack and fasten it securely with
the mounting screws as shown in Figure 3-3.

19-Inch Rack

MRXI 10 BASE-T HUB with LANVIEW

Screws (4)

Figure 3-3 Installing the MRXI in the Rack

3.3.2 Wall Mounting the MRXI

When you wall mount the MRXI, the cable connections must face down.
Refer to Figure 3-4 and perform the following steps to wall mount the
MRXI.

3-3

INSTALLATION

Note: 1/4-inch Molly screw anchors for wall mounting are not included

with the MRXI.

1. Use the supplied screws to attach the wall mounting brackets to the
bottom of the MRXI as shown in Figure 3-4. There are two brackets,
one for each side.

Figure 3-4 Installing the Wall Mounting Brackets

2. Select the wall location for the MRXI within 7 feet of a power outlet.

WARNING: There is a potential SHOCK HAZARD if there is electrical
wiring within the wall that interferes with drilling for pilot holes. Select a
wall location where drilling pilot holes for the Molly screws will not come in
contact with electrical wiring in the wall.

3. You will need a pencil for this step. With the wall mounting brackets
attached to the MRXI, position the MRXI against the wall where it
will be permanently mounted with the network port facing down. Use
the pencil to mark the wall location for the four pilot holes.

4. Set the MRXI aside and carefully drill four 1/4” pilot holes, one for
each of the Molly screw anchors and insert the four Molly screw
anchors into the holes just drilled.

3-4

Molly Anchor

INSTALLATION

Figure 3-5 Wall Mounting the MRXI

5. Tighten each of the anchor screws until the anchor expands holding

the anchor firmly in the wall, then remove the screws completely.

6. Position the MRXI on the wall over the anchors and reinstall the four

anchor screws to attach the MRXI to the wall, as shown in Figure 3-5.
Tighten the four anchor screws.

3.3.3 Free-Standing Installation

For a free-standing shelf or tabletop installation, locate the MRXI within
7 feet of its power source and with an unrestricted free surface area 21
inches wide, 18 inches deep, and 6 inches high, as shown in Figure 3-6.

3-5

INSTALLATION

B

MRXI 10 BASE-T HUB with LANVIEW

A

A = 15 cm (6 in)
B = 46 cm (18 in)
C = 53 cm (21 in)
D = 213 cm (7 ft)

Figure 3-6 Shelf or Table-top Installation

C

D

3.4 CONNECTING THE MRXI TO THE POWER SOURCE

Note: The MRXI has a universal power supply. This allows y ou to connect

the MRXI to power sources from 85 Vac to 264 Vac, 47-63 Hz.

To connect the MRXI to the power source, plug the power cord into a
grounded wall outlet. Turn on the power switch at the back panel of the
MRXI. Verify that the PWR LED is lit, this indicates that the MRXI is
receiving power. After the MRXI runs a self test, the CPU LED flashes
green indicating normal operation. If the LED remains red, the processor
is faulty.

3.5 CONNECTING THE MRXI TO THE NETWORK

The procedure for connecting Ethernet segments to the MRXI varies
depending on the media and ports being connected. Refer to the following
list and perform the procedure described in the subsections that apply to
your MRXI:

• Network Port (MRXI-22/24), refer to subsection3.5.1

• EPIM-T, refer to subsection 3.5.2

• EPIM-X, refer to subsection 3.5.3

• EPIM-F1, F2, F3, refer to subsection 3.5.4

• EPIM-C, refer to subsection 3.5.5

• EPIM-A, refer to subsection3.5.6

3-6

INSTALLATION

3.5.1 Connecting the Network Port Cabling

You attach unshielded twisted pair segments to the RJ-45 Network Ports
on the front panel of the MRXI. 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.

1. Connect twisted pair segments to the MRXI Network Port (see Figure

3-7) by inserting the RJ-45 connector from each twisted pair segment
into the desired RJ-45 port number on the MRXI.

EPIM 1

24X

23X

22X

21X

12X

11X 10X

9X

20X 19X

8X 7X

18X

6X

17X

5X

16X

4X

15X

3X

14X

2X

13X

1X

EPIM 1

Figure 3-7 MRXI-24 Network Ports

2. Check that the associated LNK LED for the port is lit. If the LED is

not lit, perform each of the following steps until it is:
a. Check that the 10BASE-T device at the other end of the twisted

pair segment is powered up.

b. Verify that the RJ-45 connector on the twisted pair segment has

the proper pin-outs as shown in Figure 3-8.

3-7

INSTALLATION

NOTE:
RX+/RX– and TX+/TX–

must share a common
color pair.

Figure 3-8 Cable Pin-outs - RJ-45 Network Ports

NETWORK

Port (1-12)

RX+
RX–

TX+
TX–

1
2

3
6

RJ-45 to RJ-45

10BASE-T

DevicePort

TX+

1

TX–

2

3

6

c. Check the cable for continuity.
d. Check that the twisted pair connection meets dB loss and cable

specifications outlined in 10BASE-T Twisted Pair Network
Requirements.

RX+
RX–

e. Check that the cross-over switch is in the correct position.

If a link still has not been established, contact Cabletron Systems
Technical Support.

3.5.2 Connecting a Twisted Pair Segment to an EPIM-T

Before connecting a segment to the EPIM-T, check each end of the
segment to determine if the wires have been crossed-over for the proper
connection (see Figure 3-11 for proper pin-outs). If the wires are not
crossed-over you can use the switch on the EPIM-T (Figure 3-9) to
internally cross-over the RJ-45 port, eliminating the need to rewire the
twisted pair segment going into the port. If the wire is crossed-over, set
the switch on the EPIM to the
switch to the X position.

= position. If not crossed-over, set the

3-8

Switch

LNK

EPIM-T

INSTALLATION

EPIM-T
Front Panel

X

Figure 3-9 EPIM-T Cross-over Switch

II

To connect a EPIM-T to a Twisted Pair Segment:

1. Connect the twisted pair segment to the module by inserting the RJ-45

connector on the twisted pair segment into the RJ-45 port on the
module. See Figure 3-10.

2. Check that the LNK LED for the port is lit. If the LED is not lit,

perform each of the following steps until it is:
a. Check that the 10BASE-T device at the other end of the twisted

pair segment is powered up.

b. Verify that the RJ-45 connector on the twisted pair segment has

the proper pin-outs as shown in Figure 3-11.

c. Check the cable for continuity.

Figure 3-10 The EPIM-T

3-9

INSTALLATION

d. Check that the twisted pair connection meets dB loss and cable

specifications outlined in 10BASE-T Twisted Pair Network
Requirements.

e. Check that the cross-over switch is in the correct position.

10BASE-T Device
Port

1

TX+

2

TX-

3

RX+

6

RX-

NOTE:
RX+/RX- and TX+/TX­must share a common
color pair.

Figure 3-11 Cable Pin-outs - EPIM-T RJ-45 Port

RX+
RX-

TX+
TX-

EPIM-T
Port

1
2

RJ-45 to RJ-45
3
6

If a link still has not been established, contact Cabletron Systems
Technical Support.

3.5.3 Connecting an AUI Cable to an EPIM-X

To connect an EPIM-X to an external network device, attach an AUI
cable, no longer than 50 meters in length, to the port located on the
EPIM-X. See Figure 3-12. You must also set the SQE switch to off.

CAUTION: Ensure that the external transceiver to which the MRXI will be
connected does not have the signal quality error (SQE or “heartbeat”) test
function enabled. The MRXI will not operate if the transceiver has the
SQE test function enabled, and the network will be unusable . Refer to the
applicable transceiver manual.

3-10

INSTALLATION

SQE

EPIM-X

Figure 3-12 The EPIM-X

3.5.4 Connecting a Fiber Optic Link Segment to an
EPIM-F1, EPIM-F2, or EPIM-F3

When connecting a fiber optic link segment to an EPIM-F1, F2, or F3
keep the following in mind:

• If you are connecting a fiber optic link segment with SMA 906

connectors to an EPIM-F1 with SMA ports, ensure that half alignment
sleeves are in place on each connector. A full alignment sleeve will
damage the receive port. SMA 905 connectors do not need alignment
sleeves.

• If you are connecting a fiber optic link segment with ST connectors to

an EPIM-F2 with ST ports, keep in mind that ST connectors attach to
ST ports much like BNC connectors attach to BNC ports. The
connector is inserted into the port with the alignment key on the
connector inserted into the alignment slot on the port. The connector
is then turned to lock it down.

• The physical communication link consists of two strands of fiber optic

cabling: the T ransmit (TX) and the Receive (RX). The T ransmit strand
from the applicable port on the module will be connected to the
Receive port of a fiber optic Ethernet device at the other end of the
segment. For example, TX of the applicable port on the module will go
to RX of the other fiber optic device. The Receive strand of the
applicable port on the module will be connected to the Transmit port
of the fiber optic Ethernet device. For example, RX of the applicable
port on the module will go to TX of the other fiber optic device.

We recommend that you label the fiber optic cable to indicate which
fiber is Receive and which is Transmit. When you buy fiber optic

3-11

INSTALLATION

LNK

EPIM-F1/F2

RX TX

LNK

EPIM-F3

RX TX

cable from Cabletron Systems, it is labeled so that: at one end of the
cable, one fiber is labeled 1, and the other fiber is labeled 2. This
pattern is repeated at the other end of the cable. If you did not
purchase your cable from Cabletron Systems, be sure you have
labeled your cable in the manner described above.

CAUTION: Do not touch the ends of the fiber optic str ands , and do not let
the ends come in contact with dust, dirt, or other contaminants.
Contamination of the ends can cause problems in data transmissions.
If the ends become contaminated, clean them with alcohol using a soft,
clean, lint free cloth.

To connect a fiber optic link segment to an EPIM-F1 or an EPIM-F2:

1. Remove the protective plastic covers from the fiber optic ports on the
applicable port on the module and from the ends of the connectors on
each fiber strand.

2. Attach the fiber labeled 1 to the applicable receive port, labeled RX,
on the module. See Figure 3-13.

Figure 3-13 The EPIM-F1/F2 and EPIM-F3

3. Attach the fiber labeled 2 to the applicable transmit port labeled TX,
on the module.

4. At the other end of the fiber optic cable, attach the fiber labeled 1 to
the transmit port of the device.

5. Attach the fiber labeled 2 to the receive port.

6. Check that the LNK LED on the applicable port on the module is lit.
If the LED is not lit, perform each of the following steps until it is:

a. Check that the power is turned on for the de vice at the other end of

the link.

b. Verify that the fiber strands are properly “crossed over” between

the applicable port on the module and the fiber optic device at the

3-12

other end of the fiber optic link segment.

INSTALLATION

EPIM-C

c. Verify that the fiber connection meets the dB loss specifications

outlined in Fiber Optic Network Requirements.

If a link still has not been established, contact Cabletron Systems
Technical Support.

3.5.5 Connecting a Thin-Net Segment to an EPIM-C

To connect a thin-net segment to an EPIM-C:

1. Set the Internal Termination Switch (see Figure 3-14), located to the

right of the port and labeled TERM to:

• The on position (•) if the thin-net segment connected directly to
the port will be internally terminated at the port.

• The off position (o) if the thin-net segment will not be terminated
at the port or externally terminated.

2. If the Internal Termination switch is in the On position, connect the
thin-net segment directly to the BNC port.

3. If the Internal Termination switch is in the Off position:
a. Attach a BNC tee-connector to the BNC port on the module.
b. Attach the thin-net segment to one of the female connectors on the

tee-connector.

Note: You must terminate each segment attached to the tee-connector. If
you do not attach a segment to one of the female connections on the
tee-connector, then a terminator must be placed on that connection.

c. Attach another thin-coax segment or a terminator to the other

female connector on the tee-connector.

TERM

Figure 3-14 The EPIM-C

3-13

INSTALLATION

PWR

EPIM-A

3.5.6 Connecting an AUI Cable to an EPIM-A

To connect an EPIM-A to an external network segment, via an AUI Cable:

1. Attach an external transceiver to the network segment that will be
connected to the AUI port. Refer to the applicable transceiver manual.

2. Attach an AUI cable, no longer than 50 meters in length, to the
transceiver connected to the network in step 1.

3. Connect the AUI cable to the AUI port located on the EPIM-A. See
Figure 3-15.

4. Lock the AUI connector into place using the slide latch on the
connector.

Figure 3-15 The EPIM-A

CAUTION: Ensure that the external transceiver to which the MRXI will be

connected does not have the signal quality error (SQE or “heartbeat”) test
function enabled. The MRXI will not operate if the transceiver has the
SQE test function enabled, and the network will be unusable . Refer to the
applicable transceiver manual.

5. Check that the PWR LED on the EPIM-A is lit. If the PWR LED is
not lit, contact Cabletron Systems Technical Support.

6. If the PWR LED is lit with the AUI cable disconnected, continue with
the following checks:

a. Check the AUI connections for proper pin-outs. The pin-outs for

the transceiver connection are listed in Chapter 2, Installation
Requirements/Specifications.

b. Check the cable for continuity.
c. Reconnect the AUI cable to the MRXI and the device.

If the LED is still not lit after reconnecting the segment, contact Cabletron
Systems Technical Support.

3-14

INSTALLATION

3.6 FINISHING THE INST ALLATION

The MRXI is now ready for operation. Before placing the network into
service, test the installation thoroughly, making sure that you can address
all stations and that the MRXI and all stations are indicating normal
operation. Ensure that the networking software is configured properly to
match the installed network. If you encounter errors or abnormal
operation, proceed to Chapter 4, Testing and Troubleshooting.

3-15

INSTALLATION

3-16

CHAPTER 4

TESTING AND TROUBLESHOOTING

This chapter contains procedures for testing the MRXI after you connect
it to the network. It also describes LANVIEW and includes instructions
for using the LCD display to troubleshoot physical layer network
problems.

4.1 INSTALLATION CHECK-OUT

After you connect the MRXI to the network, verify that packets pass
between all Ethernet devices connected to the MRXI and any other
devices connected to the network. If you encounter difficulty with any of
the attached devices, check the link as follows:

1. Check that the LNK LED, if applicable, for the port is lit. If the LED

is not lit:
a. Check that the 10BASE-T device at the other end of the twisted

pair segment is powered up.

b. Verify that the connector on the twisted pair segment has the

proper pin-outs. Refer to Chapter 2 for the pin assignments for
twisted pair connectors.

For EPIM-F1/EPIM-F2 check that the TX and RX fibers are
properly connected.

For EPIM-A check that the PWR is lit.

c. Check the cable for continuity. A variety of tools are available for

this test, depending on the media you are using.

d. Check that the twisted pair segments meet cable specifications for

dB loss described in Chapter 2.

2. If the remote station is ready and the LNK LED is lit, but no data

passes through the port, one of two conditions may exist:

4-1

TESTING AND TROUBLESHOOTING

• Network management has disabled the port.

• The port is segmented either because the collision detector was on

for more than 110 µsec or the MRXI detected more than 30
consecutive collisions on the attached segment. The af fected port
remains segmented until a good packet is transmitted/received
without collisions.

If the LNK LED is still not lit, contact Cabletron Systems Technical
Support.

4.2 TESTING SEGMENTS ATTACHED TO THE MRXI

You can test the Ethernet segments connected to the MRXI to determine
if they comply with IEEE 802.3 specifications. To do this, use two

™

Ethernet node testers, such as Cabletron Systems LAN-MD
place of the Ethernet devices normally attached on any two links. Figure
4-1 shows several methods for connecting the LAN-MD to test different
media types and links connected to the MRXI. The LAN-MDs exchange
valid data packets for end-to-end testing.

attached in

To test any single link; select two links (the link you want to test and a
second link that you know operates properly), and perform the following
steps:

Note: The flexibility of the MRXI permits a variety of media combinations,
resulting in many possible test configurations. Since it is impossible to
cover e v ery combination of network media and MRXI configuration, minor
adjustments to the testing procedures given here may be necessary to
test your specific configuration.

1. Connect two LAN-MDs, one at the end of each of the Ethernet links
your are testing. If you connect one or both of the LAN-MDs to a
segment that is attached to:

4-2

TESTING AND TROUBLESHOOTING

EPIM-T

9

TPT-T

FIBER OPTIC (EPIM-F1/F2) TO

LAN-MD

EPIM-F1/2

MRXI

FOT-F

UNSHIELDED TWISTED PAIR

AUI CABLE

AUI CABLE

LAN-MD

TPT-T

MRXI

COAX (EPIM-C) TO UNSHIELDED TWISTED PAIR

(NETWORK PORT)

AUI CABLE

LAN-MD

AUI CABLE
MRXI

EPIM-A

TPT-T

A

EPIM-T

AUI CABLE

LAN-MD

(EPIM-T)

AUI CABLE

EPIM-C

LAN-MD

AUI (EPIM-A) TO UNSHIELDED

TWISTED PAIR (EPIM-T)

AUI CABLE

LAN-MD

Figure 4-1 Test Connections for MRXI Segments

a. one of the unshielded twisted pair (Network) ports or EPIM-T

installed in the MRXI:

1.) Connect a properly functioning Cabletron Systems TPT-T
10BASE-T Twisted Pair Transceiver to the device end of the
Twisted Pair Segment coming from the applicable port on the
MRXI.

2.) Connect a LAN-MD to the TPT-T by using an AUI cable.

4-3

TESTING AND TROUBLESHOOTING

b. EPIM-F1 or EPIM-F2 installed in the MRXI:

1.) Connect a properly functioning Cabletron Systems FOT-F
Fiber Optic Transceiver to the device end of the Fiber Optic
Link Segment coming from the EPIM-F1/F2.

2.) Connect a LAN-MD to the FOT-F by using an AUI cable.

c. EPIM-C installed in the MRXI:

1.) Connect a transceiver and an AUI cable to the Thin-net
segment.

2.) Connect a LAN-MD to the AUI cable.

d. EPIM-A installed in the MRXI:

1.) Attach an external transceiver to the segment coming from the
port on the EPIM-A.

2.) Connect a LAN-MD to the transceiver by using an AUI cable.

2. Select and run test 6 - SERVER on either LAN-MD connected to the

Ethernet network on either side of the wide area link.

3. Verify that the Test Status PASS LED is lit and that the Status Code
reads 000 or 001. If these two conditions exist, the LAN-MD is now
the SERVER unit and, when used with another LAN-MD, will echo
packets.

4. Select and run test 4 - NODE CHECK on the LAN-MD connected to
the Ethernet network on the other side of the wide area link.

5. Verify that this test passes by ensuring at least 100 packets are sent and
received between LAN-MDs with no errors. Packets are sent from this
LAN-MD to the LAN-MD at the other end of the wide area link, acting
as the Server, then echoed back.

After successfully completing these tests using the links, the MRXI is
ready for normal operation. If you note any failures, contact Cabletron
Systems Technical Support.

4-4

TESTING AND TROUBLESHOOTING

10BASE-T HUB with LANVIEW

MRXI-24

4.3 USING LANVIEW

LANVIEW is Cabletron Systems’ built-in visual diagnostic and status
monitoring system. Using LANVIEW, your network troubleshooting
personnel can quickly scan the LANVIEW LEDs to observe network
status or diagnose network problems, and determine which node or
segment is faulty. Figure 4-2 shows the locations for each of the front
panel LANVIEW LEDs.

RCV

E

The Complete Networking Solution

24 23 22 21 1 18 17 16 15 14 13

2

E

1

LNK

CPU

12 11 10 9 8 7 6 5 4 3 2 1

PWR

Figure 4-2 LANVIEW LEDs

PWR (Green)
When this LED is lit, it indicates that the MRXI is receiving power. If
this LED is not lit, it indicates a loss of input power. Check the input
power source (circuit breaker, fuse, etc.). If the proper power source is
present, the problem could be with the MRXI.

RCV (Yellow)
When this LED flashes, it indicate that the MRXI is repeating data
packets received from the associated Network Port segment. The flash
of the LED is pulse stretched for viewing effect.

4-5

TESTING AND TROUBLESHOOTING

LNK (Green)
When this LED is lit, it indicates an established link between the
associated twisted pair segment and the 10BASE-T device at the other
end of the segment. This LED will remain lit as long as a link is
maintained

If a port receives no data for 16 msec from the device at the other end
of the segment, a positive link test pulse of 100 nsec is sent onto the
transmit link of the twisted pair cable. The MRXI receives these link
test pulses and checks to determine if they occur at the correct rate,
polarity, and pulse shape. If the MRXI receives no link test pulses, or
the pulses are not correct, the transceiver enters the Link Fail State and
the LED will not be lit. The MRXI does not receive or transmit data
until it receives a correct link test pulse or a valid packet.

When the MRXI is powered-on, the LNK LED flashes if the MRXI
detects reversed polarity on the segment attached to the associated
port.

CPU (Flashing Green)
This LED alternates from red to green during power up. After the boot
is complete, the LED flashes green. A flashing green LED indicates
normal operation. A red LED indicates a faulty processor.

4.4 THE LCD DISPLAY

The MRXI is equipped with an LCD display as shown in Figure 4-3. The
LCD display is a diagnostic tool that gives you important status
information about the MRXI such as: Power up diagnostics, Revision
levels, MAC and IP Addresses, and Error Alerts.

4-6

TESTING AND TROUBLESHOOTING

MRXI-24

10BASE-T HUB with LANVIEW

The Complete Networking Solution

DISPLAY RESET

Figure 4-3 LCD Display

The LCD displays four types of messages:

LCD Display

• Static System Messages

• Alarm Messages

• Unsaved Initialization Messages

• Saved System Messages

Static System Messages

These messages display MRXI configuration information. To view the
Static System Messages, momentarily press the display button at the side
of the LCD window. Press the display button to scroll through each
message. If you do not press the display button for 20 seconds, the display
defaults to the product name.

Displayed Messages Comments

IP Address Displays the current MRXI
xxx.xxx.xxx.xxx IP address. You can change this

through Local Management.

4-7

TESTING AND TROUBLESHOOTING

MAC Address Displays the MAC address.
00001dxxxxxx

RAM Image Displays the revision number of the
Rev. xx.xx.xx Flash EEPROM. The revision

increments each time you download
new software to the Flash EEPROM.

Boot PROM Displays the revision number of the
Rev. xx.xx.xx internal Boot PROM. The revision

increments each time you change the
Boot PROM.

Flash Programmed Displays the number of times you
xx Times download new software to the Flash

EEPROM.

Console Port Displays the Baud Rate you set in
Baud Rate xxxxx Local Management.

Console Port This can be changed through
Function xxxxx Local Management.

Modem Port Displays the current baud rate for
Baud Rate xxxxx the modem port

Modem Port Displays the current function of the
Function xxxxxx modem port (OFFLINE, LIM, UPS).

Alarm Messages

Alarm messages pertain to events that occur within the MRXI. Press the
display button and hold for two seconds to view alarm messages. Press
the display button to scroll through each message. If you do not press the
display button for 20 seconds, the display defaults to the product name.

4-8

TESTING AND TROUBLESHOOTING

Displayed Messages Comments

Port xxxxxx Displays segmentation status of
Segmented network ports 1-24, EPIM-1 or

EPIM-2.

Port xxxxxx Displays segmentation status of
UnSegmented network ports 1-24, EPIM-1, or

EPIM-2.

Port xxxxxx Displays link status of network
Link Established ports 1-24, EPIM-1 or EPIM-2.

Port xxxxxx Displays link status of network
Not Linked ports 1-24, EPIM-1 or EPIM-2.

EPIM-x Displays installation status of
Inserted EPIM-1 or EPIM-2.

EPIM-x Displays installation status of
Removed EPIM-1 or EPIM-2.

EPIM-x Indicates unauthorized access
Security Violation attempt at EPIM-1 or EPIM-2.

CableRedun Fail Indicates failure of redundant link
Port EPIM-x at EPIM-1 or EPIM-2.

CableRedun Enable Indicates redundant link enabled at
Port EPIM-x EPIM-1 or EPIM-2.

Port xxxxxx Indicates network ports 1-24,
Disabled EPIM-1, or EPIM-2 disabled.

Port xxxxxx Indicates network ports 1-24,
Enabled EPIM-1, or EPIM-2 enabled.

Port xx Security Indicates unauthorized access
Violation attempt at ports 1-24.

Cable Redundancy Indicates failure of redundant link
Port xx Failure at ports 1-24.

4-9

TESTING AND TROUBLESHOOTING

Cable Redundancy Indicates redundant link enabled
Enable Port xx at ports 1-24.

No Messages in No Alarm messages.
Queue x

Unsaved Initialization Messages

These are power-up messages that appear on the LCD display as the e v ent
occurs but are not saved in a buffer for future recall. Unsaved
Initialization Messages include initializing unit, download, and unit ready
messages. If Failure or Error messages appear, call Cabletron Technical
Support.

ailure or Error Messages

F

Cabletron Cabletron
Ctrl. Reg. Err. BBRAM Failure

Cabletron Cabletron
SDRAM Failure Modem SCC Error

Cabletron Cabletron
SONIC Failure Bit Swap Failure

Cabletron Cabletron
Console SCC Error LDRAM Failure

Cabletron
82C54 Failure

Normal Unsaved Initialization Messages

Cabletron Cabletron
Hardware Init Boot From Flash

Cabletron Cabletron
BOOTP Discovery RARP Req. State

4-10

TESTING AND TROUBLESHOOTING

Cabletron Cabletron
TFTP Req. State TFTP in Progress

Cabletron Cabletron
TFTP Complete Erasing Flash

Cabletron Cabletron
Programming Flash Flash Programmed

Cabletron Cabletron
Boot Complete Test in Progress

Saved System Messages

Saved System Message are device related startup or boot strap messages,
BOOTP/TFTP host, or startup error messages. To display Saved System
Messages, press the display button and hold for two seconds while in the
Alarm Messages display. The messages that may appear are shown
below:

Displayed Messages

TFTP Host TFTP File
xxx.xxx.xxx.xxx xxxxxxxxxxxxxxxx

Last Host Used Last File Used
xxx.xxx.xxx.xxx xxxxxxxxxxxxxxxx

4-11

TESTING AND TROUBLESHOOTING

4-12

CHAPTER 5

LOCAL MANAGEMENT

Local Management provides unique management and control capabilities
for the MRXI. Local Management supplies the tools to manage the MRXI
and all of its attached segments. You can:

• assign an IP address and subnet mask

• select a default gateway

• set interface parameters for both serial ports, Local Management, or

Uninterruptible Power Supply proxy (UPS)

• control access to the MRXI through the community names established

in the Community Names Table

• designate which Network Management Workstations receive trap

messages from the device

• navigate through the Management Information Base (MIB) and

manage the objects within it from a remote location. Given the
appropriate security level, the MIB is accessible from the MRXI
through either SNMP Tools or the Command Line Interface (CLI).

5.1 TERMINAL CONFIGURATION

You access Local Management by attaching a management terminal to
the RJ-45 CONSOLE port on the front panel of the MRXI as shown in
Figure 5-1. You can also use a Hayes compatible modem connected to the
RJ-45 MODEM port. The console connection supports a Digital
Equipment Corporation VT 320™ terminal or PC emulation of one of
these terminals.

5-1

LOCAL MANAGEMENT

MRXI-24

CONSOLE
CABLE

MANAGEMENT
TERMINAL

Figure 5-1 Management Terminal Connection

Table 5-1 lists the setup requirements for the local management terminal.
If your terminal is a Digital Equipment Corporation VT 320™ terminal,
press F3 to access the Setup Directory. If you have a terminal emulation
of the Digital Equipment terminals, refer to your equipment user manual
for setup procedures.

5-2

LOCAL MANAGEMENT

Table 5-1 Terminal Setup Requirements

MENU FUNCTION SELECTION

Display Setup: Columns 80 Columns

Controls Interpret Controls
Auto Wrap No Auto Wrap
Test Cursor Cursor

General Setup: Mode 7 Bit Control

Cursor Keys Normal Cursor Keys

Communications
Setup:

Keyboard Setup: Auto Repeat any option

Transmit Transmit = 9600

Receive Receive = Transmit
XOFF any option
Bits, Parity 8 Bits, No Parity
Stop Bit 1 Stop Bit
Local Echo No Local Echo

Port

Transmit any option
Auto Answerback No Auto Answerback

Keyclick any option
Margin Bell Margin Bell
Warning Bell Warning Bell
Auto Answerback No Auto Answerback

DEC-423,
Data Leads only

5.1.1 Console Cable Configuration

Cabletron Systems supplies a console cable kit with the MRXI. This kit
includes an unshielded twisted pair cable with RJ-45 connectors on both
ends, an RJ-45 to 25 pin adapter, and an RJ-45 to 9 pin adapter. Use this
kit to attach the terminal to the RJ-45 CONSOLE port on the front panel
of the MRXI. Figure 5-2 shows the pin-out for both cables.

5-3

LOCAL MANAGEMENT

Pin 1

RJ-45 CONSOLE PORT

RECEIVE

TRANSMIT

SIGNAL GROUND

DATA SET READY

DATA TERMINAL READY

CONSOLE PORT

RJ-45

TRANSMIT

RECEIVE

SIGNAL GROUND

DATA SET READY

DATA TERMINAL READY

RJ-45 TO 25 PIN

CABLE

4
1

5

2
6

1
4

5
2

6

FEMALE - 25 Pin

"D" Shell Connector

2

TRANSMIT

3

RECEIVE

7

SIGNAL GROUND
DATA TERMINAL READY

20

CLEAR TO SEND

5

LOCAL MANAGENT

CONSOLE

RECEIVE

2

TRANSMIT

3

SIGNAL GROUND

5

READY TO SEND

7

CLEAR TO SEND

8

Figure 5-2 Console Cable Pin-outs

Connect the console cable to the MRXI as follows:

1. Attach the male RJ-45 connector to the CONSOLE port of the MRXI.

2. Attach the female end (25 pin or 9 pin, as applicable) to the COMM
port on the terminal.

5-4

RJ-45 TO 9 PIN

CABLE

FEMALE - DB-9

(9-Pin Connector)

LOCAL MANAGEMENT

5.1.2 Modem Cable Configuration

To access Local Management with a modem use an RS-232 cable
available from Cabletron Systems. This cable connects the modem to the
MRXI Modem port. Figure 5-3 shows the pin-out for a cable and a RJ-45
connector at the MRXI end of the cable.

Pin 1

RJ-45 MODEM PORT

RJ-45
Female

TRANSMIT

RECEIVE

SIGNAL GROUND

DATA CARRIER DETECT

DATA TERMINAL READY

RING

RJ-45 TO 25 PIN

CABLE

1
4
5

2
6

8

2

TRANSMIT

3

RECEIVE

7

SIGNAL GROUND

DATA CARRIER DETECT

8

20 DATA TERMINAL READY
22

RING

FEMALE - 25 Pin

"D" Shell Connector

Figure 5-3 Modem Cable Pin-outs

5.1.3 Cable Configuration for UPS

To configure the cable connections for the Uninterruptible Power Supply
(UPS):

1. Plug a straight-through twisted pair, RS232, cable into the MRXI’s

RJ-45 Modem Port.

2. Plug the other end of the RS232 cable into the adapter (Part #9372066)

and connect the adapter to the UPS.

You can now use the UPS option in the Local Management.

5-5

LOCAL MANAGEMENT

5.2 ACCESSING LOCAL MANAGEMENT

After ensuring that your terminal is properly configured, and that the
physical cable connections are correct, you can access the Local
Management interface.

To access Local Management:

1. Turn the terminal on. The MRXI Password screen, Figure 5-4,
appears.

MRXI-960 LOCAL

MANAGEMENTCabletron MRXI

Revision x.xx.xx

CABLETRON Systems,Incorporated

35 Industrial Way, P.O. Box 5005

Rochester, NH 03867-5005 USA

[phone]

(c) Copyright CABLETRON Systems Inc. 1993

MRXI-960 F/W Version: x.xx.xx

Boot EPROM Version: x.xx.xx

MRXI-960 Board Rev#: x

Enter USER PASSWORD:

Figure 5-4 MRXI Password Screen

2. Enter your Password. The factory default password for super-user
access is “public” or the Return key.

Note: Your password is one of the community names specified in the
Community Name Table. Access to certain Local Management
capabilities depends on the degree of access accorded that community
name. See section 5.3.

5-6

LOCAL MANAGEMENT

3. Press the Return key.

• If your password entry is invalid, the cursor returns to the
beginning of the password entry field.

• If your password is valid, the associated access privilege appears
briefly, then the MRXI Local Management Feature Selection
screen, Figure 5-5, appears.

Note: If you do not use the terminal keyboard for 15 minutes, your Local
Management session ends and the screen defaults to the Password
screen.

MRXI-960 LOCAL MANAGEMENT

Cablet ron MRXI Revision x.xx. xx

FEATURE SELECTION

F6 COMMUNITY NAME TABLE
F7 IP ADDR ESS ASSIGNMENT
F8 C OMP ON ENT TR A P TABLE
F9 SNM P TOOL SUP PORT
F10 COMMAND LINE I NTERFACE

EXIT LIM SERVICE

Figure 5-5 Feature Selection Screen

4. Use the arrow keys to highlight an option, and press the Return key
(or press the corresponding Function key). The selected screen
appears.

5.3 COMMUNITY NAME TABLE

The Community Name Table Option lets you set community names.
Community names serve two purposes: they act as passwords to Local
Management and they are agents of security control to your MRXI. You
control MRXI access by establishing up to four different le vels of security
authorization (basic-read, read-only, read-write, and super-user).

5-7

LOCAL MANAGEMENT

If you have super-user access, you can change the existing passwords by
changing the community names. Only the community name assigned
super-user access is given full management privileges.

5.3.1 Accessing the Community Name Table Screen

To access the Community Name Table screen from the Feature Selection
screen, use the arrow keys to highlight the Community Name Table
option and press the Return key, or press F6. The Community Name
Table screen, Figure 5-6, appears.

MRXI-960 LOCAL MANAGEMENT

Cabletron MRXI Revision x.xx.xx

COMMUNITY NAME TABLE

NOTE: S/U names are LOCAL passwords

Community Name

public
public
public
public

SAVE IP TABLE TRAP TABLE SNMP TOOLS CLI RETURN

F6

F7

F8

Access

BASIC-READ
READ-ONLY
READ-WRITE
SUPER-USER

F9

F10

Figure 5-6 Community Name Table Screen

5.3.2 Community Name Table Screen Fields

The following briefly explains each field on the Community Name Table
screen.

Community Name
Displays the user-defined name through which a user can access Local
Management for the MRXI. Any community name assigned here acts as a
password to Local Management.

Access

Indicates the access status accorded each community name. Possible
conditions are:

5-8

LOCAL MANAGEMENT

Basic-Read This allows read-only access to Local

Management, but excludes read privileges to the
Component Trap screen.

Read-Only This allows read-only access to Local

Management, but excludes access to security
protected fields of the upper levels of authorization
(read-write or super-user).

Read-Write This allows you to read and write to Local

Management fields, excluding IP Address,
SubNET Mask, and Community Names.

Super-User This access status gives the user read-write access

to Local Management and allows changes to be
made to all modifiable parameters including:
Community Names, IP Addresses, Traps, and
SNMP Objects.

5.3.3 Editing the Community Name Table Screen

The password that you use to access Local Management at the Password
screen must have super-user access for your edits to take effect. If you
enter a password with basic-read, read-only, or read-write access, Local
Management displays the message “AUTHORIZATION PROHIBITS
ACCESS”, and does not include editing capabilities.

Caution: Any community name assigned in the Community Name Table
will be a password to its corresponding level of access to Local
Management. The community name assigned super-user access is the
only one that will give you complete access privileges to Local
Management.

To make changes to the Community Name field:

1. Use the arrow keys to highlight the Community Name field adjacent
to the access level of your choice.

2. Enter the community name, up to 32 characters in length, into the
field.

3. Press the Return key.

4. Repeat steps 1 - 3 for editing any of the other community names.

5-9

LOCAL MANAGEMENT

5. Use the arrow keys to highlight the SAVE command at the bottom of
the screen and press the Return key (or press F6). The message
“SAVED OK” appears indicating that your edits are saved to memory.

Please note that the first time you try to exit the screen without saving
your changes you will get a “NOT SAVED?” message. If you proceed
to exit without saving, you will lose your edits.

6. Exit the screen by either pressing the appropriate Function key or by
using the arrow keys to highlight the RETURN command and
pressing the Return key. The RETURN command will exit you to the
Feature Selection screen.

5.4 CONFIGURING THE MRXI

At the MRXI Configuration screen, you can assign the IP address and
subnet mask.

The Configuration screen also lets you:

• Set the default gateway

• Use the Port Lock Override

• Use the Port Enable Override

5.4.1 Accessing the Configuration Screen

To access the Configuration screen from the Features Selection screen,
use the arrow keys to highlight the IP Address Assignment option and
press the Return key, or press F7. The Configuration screen, Figure 5-7,
appears.

5-10

MRXI-960 LOCAL MANAGEMENT

Cabletron MRXI Revision x.xx.xx

CONFIGURATION

LOCAL MANAGEMENT

I/F
1

SAVE IP COMMUNITY NAMES TRAP TABLE SNMP TOOLS CLI RETURN

F6 F7 F9 F10

IP Address

000.000.000.000

Default Gateway: 0.0.0.0
Serial Port 1 Application: CONSOLE Baud Rate: 9600 --ACTIVE--

Serial Port 2 Application: OFFLINE

Port LOCK Override:

Port ENABLE Override:

SubNET Mask

000.000.000.000

Baud Rate: N/A

OVERRIDE DISABLED
OVERRIDE DISABLED

F8

MAC Address
00-00-1d-05-dc-36

Figure 5-7 Configuration Screen

5.4.2 Configuration Screen Fields

The following briefly explains each field on the Configuration screen.

I/F

Gives the number of the interface corresponding to the channel over
which packets with that IP address are passing. On the MRXI, this value
is always 1.

IP Address

Displays the IP address of the MRXI.
SubNET Mask

Displays the subnet mask for the MRXI. A subnet mask is a 32-bit
quantity which “masks out” the network bits of the IP address. This is
done by setting the bits in the mask to 1 when the network treats the
corresponding bits in the IP address as part of the network or subnetwork
address, or to 0 if the corresponding bit identifies the host.

MA C Address

Displays the physical address associated with the interface.

5-11

LOCAL MANAGEMENT

Default Gateway

Displays the default gateway for the MRXI. This field is not defined until
an appropriate value is entered. The default gateway identifies the def ault
gateway device that will forward packets to other IP subnetworks.

Serial Port 1 Application

Displays the port’s application setting as CONSOLE.

Serial Port 2 Application

Displays the port’s application setting as OFFLINE or UPS.

Baud Rate

Displays the Baud Rate setting of the device attached to the MRXI
through that serial ports. The setting for Serial Port 1 is 9600. The setting
for Serial Port 2 is N/A if you do not activ ate UPS or 2400 if you activate
UPS.

Port LOCK Override

This command overrides the port locking security feature, unlocking all
ports in the MRXI.

Port ENABLE Override

This command overrides the port disable feature, enabling all ports in the
MRXI.

5.4.3 Setting the IP Address Table and SubNET Mask

Field

To set the IP Address table:

1. Use the arrow keys to highlight the IP Address field.

2. Enter the IP address into this field. The format for this entry is
XXX.XXX.XXX.XXX, with values for XXX being from 0 to 255.
The screen beeps if you enter non-numerics or adjacent dots. If the
entry does not have three dots it will be rejected.

3. Press the Return key. The IP address is displayed and the natural
subnet mask for the user is generated and displayed also.

4. Should you need to modify the subnet mask, use the arrow keys to
highlight the SubNET Mask field.

5-12

LOCAL MANAGEMENT

5. Enter the subnet mask into this field. The format for this entry is

XXX.XXX.XXX.XXX with values for XXX being from 0 to 255.

6. Press the Return key.

7. Use the arrow keys to highlight the SAVE IP option and press the

Return key, (or press F6). The message “SAVED OK” appears and
the changes are saved to memory.

Please note that the first time you try to exit the screen without saving
your changes, you will get a “NOT SAVED?” message. If you
proceed to exit without saving, you will lose your edits.

5.4.4 Setting the Default Gateway

The Default Gateway field allows you to describe the router through
which the MRXI will be forwarding IP packets.

To set the Default Gateway:

1. Use the arrow keys to highlight the Default Gateway field.

2. Enter the gateway’s default mask in this field. The format for this entry

is XXX.XXX.XXX.XXX with values for XXX being from 0 to 255.

3. Press the Return key. If your entry is accepted as a valid default

gateway, “OK” appears to the right of the field.

5.4.5 Setting the UPS Option

To connect to the Uninterruptible Power Supply (UPS) through the Local
Management:

1. Use the arrow keys to highlight the Serial Port 2 Application: field.

2. Press the Return key so that “UPS” appears in the field. This field

toggles between “OFFLINE” and “UPS”.

3. Use the arrow keys to highlight the Serial Port 2’s Baud Rate field and

press the Return key so that “2400 Connect?” appears in the field.

4. Use the arrow keys to highlight Connect? and press the Return key.

5. Enter Y if you want to connect a UPS, or N if you do not want a UPS

connection. If you pressed Y, you are connected to the UPS.

5-13

LOCAL MANAGEMENT

To disconnect from a UPS through the Local Management:

1. Use the arrow keys to highlight the Serial Port 2 Application: field.

2. Press the Return key so that “OFFLINE” appears. You are now
disconnected from the UPS.

3. Use the arrow keys to highlight Disconnect? and press the Return
key.

4. Enter Y if you want to disconnect the UPS; N if you do not want to
disconnect. If you pressed Y, you are disconnected from the UPS.

5.4.6 Using the Port LOCK Override Option

When the chassis has been locked for security measures, unauthorized
devices will not be allowed to communicate to the MRXI. The Port
LOCK Override function provides a fail-safe recovery in the event that
the chassis cannot be unlocked via remote in-band management.

To set the Port LOCK Override:

1. Use the arrow keys to highlight the Port LOCK Override field.

2. Press the Return key. The adjacent field displays “UNLOCK PORTS
Y/N”.

3. Enter Y to continue unlocking all of the ports, or N to discontinue the
port lock override. If you answer Y, all ports are unlocked and the
message “LOCK OVERRIDE COMPLETED” appears.

5.4.7 Using the Port ENABLE Override

The Port ENABLE Override function provides a fail-safe recovery in the
event that the ports on the MRXI cannot be enabled via remote in-band
management.

5-14

LOCAL MANAGEMENT

To set the Port ENABLE Override:

1. Use the arrow keys to highlight the Port ENABLE Override field.

2. Press the Return key. The adjacent field displays “ENABLE PORTS

Y/N”.

3. Enter Y to continue enabling all of the ports, or N to discontinue the

port enable override. If you answer Y, all existing ports are enabled,
and the message “PORT ENABLED” appears.

4. To exit the Configuration screen, press the appropriate Function key.

To choose the Feature Selection screen, use the arrow keys to highlight
the RETURN command and press the Return key.

5.5 SETTING THE TRAP T ABLE

The Trap Table defines the management stations that will receive SNMP
Traps for alarm/event notification.

5.5.1 MRXI T rap T able Screen

To access the Trap Table screen from the Features Selection screen, use
the arrow keys to highlight the Component T rap Table option and press
the Return key, or press F8. The Trap Table screen, Figure 5-8, appears.

5-15

LOCAL MANAGEMENT

MRXI-960 LOCAL MANAGEMENT

Cabletron MRXI Revision x.xx.xx

TRAP TABLE

SNMP Community Name
<CR>

<CR>
<CR>
<CR>
<CR>
<CR>
<CR>
<CR>

SAVE COMMUNITY NAMES IP TABLE SNMP TOOLS CLI RETURN

F6 F7 F8 F9 F10

Traps

N
N
N
N
N
N
N
N

Trap IP Address

0.0.0.0

0.0.0.0

0.0.0.0

0.0.0.0

0.0.0.0

0.0.0.0

0.0.0.0

0.0.0.0

Figure 5-8 Trap Table Screen

5.5.2 Trap Table Screen Fields

SNMP Community Name

Displays the community name to be included in the trap message, which
is sent to the Network Management Station with the associated IP
address.

Traps

Enables transmission of the traps to the network management station with
the associated IP address.

Trap IP Address

Indicates the IP address of the workstation to receiv e trap alarms from the
MRXI.

5.5.3 Configuring the Trap T able

1. Use the arrow keys to highlight the SNMP Community Name field
and enter the community name.

2. Press the Return key.

5-16

LOCAL MANAGEMENT

3. Use the arrow keys to highlight the Traps field and enter Y (or y) to

send alarms from the MRXI to the workstation, and N (or n) to prevent
alarms from being sent.

4. Press the Return key.

5. Use the arrow keys to highlight the appropriate Trap IP Address

field.

6. Enter the IP address of the workstation to send traps using this field.

The format for this entry is XXX.XXX.XXX.XXX, with the value of
XXX ranging from 0 to 255, and three dots, or else it returns to the
beginning of the field.

7. Use the arrow keys to highlight the SAVE option and press Return (or

press F6). The message “SAVED OK” appears.
Please note that if you attempt to exit the screen without saving your

changes, a “NOT SAVED?” message appears. If you proceed to exit
without saving, you will lose your edits.

8. To exit the Trap Table screen, press the appropriate Function key. To

choose the Feature Selection screen, use the arrow keys to highlight
the RETURN command and press the Return key.

Alarms for these traps will now be sent to the designated IP addresses
from the MRXI.

5.6 SNMP TOOLS

This section describes how you can use the SNMP Tools screen to access
Management Information Bases (MIBs). Access to screen options
depends on the access status accorded to your community name. This
section describes super-user management capabilities.

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5.6.1 Accessing the SNMP Tools Screen

To access the SNMP T ools screen from the Features Selection screen, use
the arrow keys to highlight the SNMP Tools Support option and press
the Return key or F9. The SNMP Tools screen, Figure 5-9 appears.

MRXI-960 LOCAL MANAGEMENT

Cabletron MRXI Revision x.xx.xx

SNMP TOOLS

COMMUNITY NAME: public

OID PREPEND: 1.3.6.1

GET SET GETNEXT WALK RECALL-OID STEP CYCLES REPEAT
F6 F7 F8 F9

RETURN

F10

Figure 5-9 SNMP Tools Screen

5.6.2 SNMP Tools Screen Fields

The following briefly describes SNMP Tools screen fields and commands
on how to use them.

Community Name

Identifies the community name used as a password to determine access
level to the MIB component.

OID Prepend

Specifies the number prefix common to all Object Identifiers (OIDs)
found in the MIBs - 1.3.6.1 is the default prefix OID. This is a modifiable
field.

Get

Lets you retrieve MIB objects using SNMP protocol.

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Set

Lets users with read-write and super-user authorization change modifiable
MIB objects, using SNMP protocol.

Get Next

Displays the OID following the current OID.

Walk

Scrolls you through a section of the MIB leaf by leaf, from a
user-specified object identifier. Leaves are the sections of the OID
separated by periods. When a walk is initialized you will see the
following categories for each walk entry, or step.

Specified OID - gives the number tag for that OID.
Size - identifies the number of bytes it takes to store that object.
Type - specifies the object’s variable type (e.g., int = integer).
Data - displays what the object identifier represents.

Recall-OID

Recalls, from memory, the last OID used.

Step

Displays the MIB walk, step by step, giving you time to view specific
leaves in detail.

Cycles

Allows you to specify the number of get next requests to cycle through
and how much time will elapse between each request.

Repeat

Repeats the last Get command, allowing you to monitor changes to a
specific OID.

5.6.3 Using SNMP Tools

SNMP Tools allows you access to valuable MIB information. You can get
information about specific object identifiers (OIDs), edit the values of
configurable OIDs, and request the OID numerically sequential to the
originally requested OID.

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Other ways to view OIDs from the SNMP Tools screen, include walking,
stepping, and cycling. Walk and cycle let you review several OIDs at a
time.

Getting and Setting Individual OIDs

To get an OID:

1. Highlight GET, using the arrow keys, and press the Return key (or
press the F6 function key). “<GET> OID (=|F9)” appears.

2. Enter the OID either by:

• using the keyboard to enter the OID minus the OID’s prepend

(e.g., if the prepend is 1.3.6.1, and you enter 4.1.3, then the
OID=1.3.6.1.4.1.3).

• entering an ‘=’ and the OID suffix (e.g., if you enter =4.1.3, then

the OID=4.1.3). This allows you to digress and not use the
prepend.

• pressing F9 to recall an OID already entered. Y ou can then use the

keyboard to modify the recalled OID as necessary.

3. Press the Return key. If there is no instance of that OID, the return
code will specify “MIB_NO_INSTANCE”, otherwise, information
about that OID’s data type, length, and value are displayed.

To get the next OID:

1. Highlight GETNEXT, using the arrow keys, and press the Return
key (or press the F8 function key). “<GETNEXT> OID (=|F9)”
appears.

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2. Enter the desired OID, or OID extension. (Press F9 to recall the last

OID request. You can then modify the recalled OID as necessary.)

3. Press the Return key. If there is no instance of that OID, the return

code will specify “MIB_NO_INSTANCE”, otherwise, information
about that OID’s data type, length, and value appear.

To set an OID:

1. Highlight SET, using the arrow keys, and press the Return key (or

press the F7 function key). “<SET> OID (=|F9)” appears.

2. Enter the OID, minus the OID’s prepend. If you have previously

entered an OID, pressing F9 recalls that entry for you. You can then
use the arrow keys to modify the recalled OID if necessary.

3. Press the Return key. If there is no instance of that OID, the return

code will specify “MIB_NO_INSTANCE”, otherwise “DATA
TYPE:” appears.

4. Enter the data type for that OID. Possible choices are: integer, string,

null, OID, IP address, counter, gauge, timeticks, and opaque.

5. Press the Return key. “DATA” appears.

6. Enter the value to correspond to the OID. If accepted, “<SET>

OPERATION CODE: XXXX <OK>” appears, otherwise an error
message appears.

Viewing Multiple OIDs

V ie wing sev eral object identifiers at one time allo ws you to quickly scan a
MIB for the specific information that you need. The Walk scrolls through
OIDs numerically sequential to the initial OID request. The Step
command scrolls the MIB Walk, one OID at a time. Cycling allows you to
specify how many GetNext commands to cycle through for one OID.

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To walk through:

1. Highlight Walk, using the arrow keys, and press the Return key.
“<INITIAL> OID (=|F9)” appears.

2. Enter the OID (minus the prepend) and press the Return key. The
screen will begin walking through the sublayers of the MIB available
from the specified OID. Each OID listed displays the specified OID,
its size, its type, and the data it contains.

3. Press the Space Bar to stop the walk, or wait for “***MIB WALK
COMPLETED***” to appear on the screen.

To step through (you can step through only after a get next):

1. Highlight Step, using the arrow keys, and press the Return key.
“Specify OID” appears.

2. Enter the OID (only the suffix is necessary) and press Return. The
Tools screen will begin to scroll one OID at a time, through all of the
sublayers of the MIB available for that OID.

To cycle through:

1. Highlight CYCLES, using the arrow keys, and press the Return key.

2. Enter the number of cycles that you want to occur after “ENTER
CYCLE COUNT:” and press the Return key.

3. Enter how many seconds delay that you want between get next
requests after “ENTER CYCLE DELAY (secs):” and press the
Return key.

5.7 COMMAND LINE INTERFACE (CLI)

The Command Line Interface (CLI) screen, Figure 5-10, will be
functional for future releases of the MRXI.

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LOCAL MANAGEMENT

MRXI-960 LOCAL

MANAGEMENTCabletron MRXI

Revision x.xx.xx

CLI INFORMATION

THIS SCREEN RESERVED FOR THE

CABLETRON COMMAND LINE

COMMUNITY NAMES IP TABLE TRAP TABLE SNMP TOOLS RETURN

F7

INTERFACE

F8 F9 F10

Figure 5-10 MRXI CLI Information Screen

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5-24

POWER SUPPLY CORD

The mains cord used with this equipment must be a 2 conductor plus
ground type with minimum 0.75 mm square conductors and must
incorporate a standard IEC appliance coupler on one end and a mains
plug on the other end which is suitable for the use and application of
the product and that is approved for use in the country of application.

GERMAN:

Die Netzleitung, die mit diesem Geraet benuetzt wird, soll einen zwei
Leiter mit Erdleiter haben, wobei die Leiter mindestens 0.75 mm sind,
mit einer normalen IEC Geraetesteckdose an einem Ende und einem
Geraetestecker am anderen Ende versehen sind, der fuer den
Gebrauch und die Anwendung des Geraetes geeignet und der zum
Benuetzen im Lande der Anwendung anerkannt ist.

SPANISH:

El cable principal de la red eléctrica utilizado con este equipo debe
tener 2 conductores y 1 toma de tierra con un mínimo de 0.75 mm2
cada uno y necesita tener un aparato de acoplamiento standard IEC en
un extremo y un enchufe para el cable principal de la red eléctrica en
el otro extremo, lo cual sea adecuado para el uso y
applicación del producto y lo cual sea aprobado para uso en el pais de
applicación.

FRENCH:

Le cordon d' alimentation reliant cet appareil au secteur doit
obligatoirement avoir deux fils conducteurs de 0.75 mm2 minimum et
un fil de terre. It doit également être équipé du côté appareil d'une
fiche agrée IEC et du côte secteur, d'une prise adaptée à l'usage du
produit et aux normes du pays où l'appareil est utilisé.