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