Cabletron Systems MR-9T, MR9T-C Installation Manual

MR9T IEEE 802.3 10BASE-T

MR9T-C IEEE 802.3 10BASE-T/10BASE-2

MULTIPORT REPEATER

INSTALLATION GUIDE

CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03866-5005

NOTICE

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 June 1992 by
Cabletron Systems, Inc.

P.O. Box 5005, Rochester, NH 03867-0505
All Rights Reserved

Printed in the United States of America
Order number: 9030521-01 June 1992

LANVIEW is a registered trademark and MMAC, MR9T-C, and
MR9T are trademarks of Cabletron Systems, Inc.

Ethernet is a trademark of Xerox Corp.
Velcro is a registered trademark of Velcro Industries, B.V.

i

FCC NOTICE

FCC NOTICE

WARNING: This equipment has been tested and found to comply

with the limits for a Class A digital device, pursuant to Part 15
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 at his own expense to correct the
interference.

If this equipment does cause interference to radio or television,
which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of
the following measures:

• Re-orient the receiving antenna.

• Relocate the repeater with respect to the computer.

• Move the repeater away from the receiver.

• Plug the repeater into a different outlet so that the computer
and the repeater are on different branch circuits.

If necessary, you should consult the dealer or an experienced radio/
television technician for additional suggestions. You may find the
following Federal Communication Commission booklet helpful:

“Interference Handbook”

This booklet is available from the U.S. Government Printing Office,
Washington D.C. 20402 - Stock No. 004-000-00482-5.

ii

CONTENTS

CONTENTS

CHAPTER 1 INTRODUCTION

1.1 Using This Manual ....................................................................1-1

1.2 Getting Help...............................................................................1-2

1.3 Overview.....................................................................................1-2

CHAPTER 2 SPECIFICATIONS AND REQUIREMENTS

2.1 Specifications..............................................................................2-1

General Specifications ...............................................................2-1

Twisted Pair Connectors ...........................................................2-2

BNC Interface (Port 9, MR9T-C) ..............................................2-3

Power Supply .............................................................................2-4

Environmental ...........................................................................2-4

Safety ........................................................................................2-4

Physical ......................................................................................2-4

2.2 10BASE-T Network Design Guidelines: MR9T........................2-5

2.3 10BASE-2 Network Design Guidelines: MR9T-C ....................2-6

CHAPTER 3 INSTALLATION

3.1 Mounting the MR9.....................................................................3-1

3.2 Connecting the MR9 to the Power Source ................................3-2

3.3 Strain Relief for the Power Cord...............................................3-2

3.4 Connecting Cables .....................................................................3-3

3.4.1 Cross-Over and Straight-Through ...............................3-3

3.5 Connecting the Network Segment ............................................3-4

3.6 Connecting Twisted Pair Segments to RJ-45 Ports .................3-6

CHAPTER 4 USING LANVIEW

4.1 The LANVIEW Indicators .........................................................4-1

iii

INTRODUCTION

CHAPTER 1

INTRODUCTION

The MR9T-C 10BASE-T/10BASE-2 Multiport Twisted Pair Repeater
(Figure 1-1) and the MR9T 10BASE-T Multiport Twisted Pair
Repeater (Figure 1-2) conform to all applicable IEEE 802.3
specifications. Each repeater has nine ports. Ports 1 through 8 on
both models are 10BASE-T compliant RJ-45 ports. Port 9 is where
the two repeater models differ. Port 9 on the MR9T has an RJ-45
connector. In addition, the MR9T has a special switch that alters the
pin configuration of Port 9. On the MR9T-C, Port 9 is a BNC
connector for a thin-coax connection. The MR9T-C also has a switch­selectable internal 50 ohm terminator.

1.1 USING THIS MANUAL

Unless otherwise noted, this manual refers to both the MR9T and
MR9T-C as the MR9.

Chapter 1, Introduction, describes the differences between the
MR9T and the MR9T-C and explains the product features.

Chapter 2, Specifications and Requirements, contains operating
specifications for the MR9. This chapter also includes the location
requirements for the MR9 and network design guidelines for
connecting the MR9 to the network.

Chapter 3, Installation, contains instructions for installing the
MR9 and connecting it to your network.

Chapter 4, Using LANVIEW, contains a functional description of
the LANVIEW indicators.

This manual assumes that you have a general working knowledge of
Ethernet or IEEE 802.3 type data communications networks and
their physical layer components.

Page 1-1

INTRODUCTION

1.2 GETTING HELP

If you need additional support related to the MR9, or if you have any
questions, comments, or suggestions related to this manual, contact
Cabletron Systems Technical Support. Before calling, please have
the following information ready:

• The product type (MR9T or MR9T-C) and the product serial

number. The serial number is located on the front panel of
the repeater.

You can contact Cabletron Systems Technical Support by any of the
following methods:

By phone: Monday through Friday between 8

A.M. and 8 P.M. Eastern Standard

Time at [phone].
By Compuserve: GO CTRON from any !
By Internet mail: [e-mail]

1.3 OVERVIEW

The MR9T and MR9T-C have eight internally crossed-over RJ-45
ports. The MR9T has a ninth RJ-45 port which is switch-selectable
for a cross-over or a straight-through pin configuration. (For an
explanation of cross-over and straight-through, see Chapter 3,
Installation.) The configuration switch gives you complete flexibility
to connect to other twisted pair Ethernet devices without using
specially configured cable segments. All RJ-45 ports incorporate a
polarity detection and correction feature which lets the repeater pass
data regardless of the polarity of a port’s twisted pair receive link.

On the MR9T-C, Port 9 has a thin-net coaxial male BNC connector
instead of an RJ-45 connector. Instead of a configuration switch, the
MR9T-C has a termination switch that lets you activate an internal
50 ohm cable terminator for Port 9.

You can use any port to connect the MR9T directly to an Ethernet
network, though Port 9 is normally used for the network connection.
Typically, the MR9T connects to a network hub, such as Cabletron
Systems’ MMAC series. The MR9T-C can connect to a network hub,
or directly to an Ethernet coax cable through a transceiver.

Page 1-2

INTRODUCTION

MR9T-C

802.3 10BASE-T/10BASE2

POWER INPUT

MULTI PORT REPEATER

WITH

LANVIEW

TERM

The Complete Networking Solution

PORT 9 8X7X6X5X 4X3X2X1X

PWR

CLN

RCV
LNK

PORT 987654321

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES.
OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS:
(1) THIS DEVICE MAY NOT CAUSE INTERFERENCE, AND
(2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED,
INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION.

POWER REQUIRED: 15V - - - , 900mA MAX
DATA CAPABILITY: 10Mb/s

LISTED

U

TUV Rheinland

SN

L

16EO

ITE REPEATER UNIT

Figure 1-1. The MR9T-C

PWR

MR9T

802.3 10BASE-T

POWER INPUT

MULTI PORT REPEATER

WITH

LANVIEW

=

The Complete Networking Solution

CLN

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES.
OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS:
(1) THIS DEVICE MAY NOT CAUSE INTERFERENCE, AND
(2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED,
INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION.

POWER REQUIRED: 15V - - - , 900mA MAX
DATA CAPABILITY: 10Mb/s

SN

X

PORT 9 8X7X6X5X 4X3X2X1X

RCV
LNK

PORT 987654321

LISTED

ITE REPEATER UNIT

U

16EO

TUV Rheinland

L

Figure 1-2. The MR9T

Page 1-3