Cabletron Systems MR-2000C User Manual

MR-2000C

MULTI-PORT REPEATER

USER’S GUIDE

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 INCIDEN-

TAL, 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 August 1988 by
Cabletron Systems Inc.

P.O. Box 6257, E. Rochester, NH 03867-6257
All Rights Reserved

Printed in the United States of America
Order number: 9030014-01 August 88

LAN-MD and LANVIEW are trademarks of Cabletron Systems Inc.

TABLE OF CONTENTS

SECTION PAGE
SECTION 1 - INTRODUCTION

1.1 INTRODUCTION ..............................................................................................................1-1

1.2 USING THIS MANUAL....................................................................................................1-1

1.3 SPECIFICATIONS.............................................................................................................1-1

1.4 RELATED USER MANUALS ..........................................................................................1-6

SECTION 2 - PREPARATION FOR OPERATION

2.1 INTRODUCTION ..............................................................................................................2-1

2.2 NETWORK DESIGN GUIDELINES................................................................................2-1

2.3 SITE SELECTION GUIDELINES.....................................................................................2-2

2.4 SET-UP FOR OPERATION...............................................................................................2-2

SECTION 3 - TESTING AND LANVIEW

3.1 INTRODUCTION ..............................................................................................................3-1

3.2 INSTALLATION CHECK-OUT .......................................................................................3-1

3.3 USING LANVIEW............................................................................................................. 3-2

WARRANTY AND SERVICE

Cabletron Systems warrants that the MR-2000C shall be free from defect in material and workmanship for a period of one (1) year from the
date of initial shipment by Cabletron Systems. The foregoing warranty does not apply to any products which have been subjected to misuse,
neglect, accident, or modification.

If found to be defective by Cabletron Systems within the terms of this warranty, Cabletron Systems’ sole obligation shall be to repair or re­place, at Cabletron Systems’ option, the defective product and carry out the unexpired term of the warranty which was applicable to the de­fective product. All replaced materials become the property of Cabletron Systems.

As a condition of this warranty, customers must (1) obtain a Cabletron Systems Return Material Authorization (RMA) number and shipping
instructions, (2) return the product (or approved subassemblies), transportation prepaid and insured to Cabletron Systems’ designated repair
facility, and (3) include a written description of the claimed defect.

If Cabletron Systems determines that the product is not defective within the terms of this warranty, the customer shall pay all costs of handling
and return postage; otherwise normal transportation charges for the return to Customer shall be paid by Cabletron Systems within the United
States only. This warranty outside of the United States excludes all costs of shipping, Customs clearance, and other related charges.

Except for the express warranties stated above, Cabletron Systems disclaims all warranties on products including all implied warranties of
merchantability and fitness; and the stated express warranties are in lieu of all obligations or liabilities on the part of Cabletron Systems.

SECTION 1
INTRODUCTION

1.1 INTRODUCTION. The Cabletron Systems MR-2000C Multiport Repeater is an easy to install meth-

od of connecting two thin-net cable segments to a thick or thin-net cable segment, or to a fiber optic link
segment. This repeater fully conforms to IEEE 802.3 specifications and provides the flexibility to connect
networks using Ethernet Version 1, Version 2, and/or IEEE 802.3 equipment.

These segments are connected by first attaching a BNC tee connector to the BNC port located on the rear
of the repeater. The BNC tee connector allows two thin-net segments, that can be 185 meters in combined
length, to be connected to the repeater. The thin or thick-net cable segment, or the fiber optic link segment,
is then connected to the repeater by attaching an external transceiver to that segment. An attachment unit
interface (AUI) cable is then used to connect the external transceiver to an AUI port, also located on the
rear of the repeater. All three segments are linked when they are attached to the repeater. The MR-2000C
will transmit re-timed data packets, regenerate preambles, extend collision fragments, automatically par­tition problem segments, and automatically reconnect non-problem segments.

The MR-2000C also incorporates Cabletron Systems’ LANVIEW™ diagnostic system. Should a problem
arise, power failures, collisions, cable faults and many other problems can be diagnosed rapidly by using
a series of LEDs.

1.2 USING THIS MANUAL. This manual provides instructions for Installing, Testing, and Operating

the Cabletron Systems MR-2000C Multiport Repeater.
This manual assumes that the user has a general working knowledge of Ethernet or IEEE 802.3 type data

communications networks and their physical layer components.

If additional support is needed related to the Cabletron Systems MR-2000C, or if you have any comments,
improvements, suggestions, or questions relating to this manual, feel free to contact Cabletron Systems
Technical Support at:

Cabletron Systems
P.O. Box 6257

E. Rochester, NH 03867-6257
Phone: [phone]

1.3 SPECIFICATIONS. Listed below are the specifications for the Cabletron Systems MR-2000C Mul-

tiport Repeater.

Cabletron Systems reserves the right to change these specifications
at any time without notice.

GENERAL

NOTE

Delay Times: (Port 1 Into Port 2 out)

Start of Packet: 1450 ns max.
Collision to JAM: 1550 ns max.

Delay Times: (Port 2 Into Port 1 out)

Start of Packet: 1150 ns max.
Collision to JAM: 1000 ns max.

Preamble:

Input: Minimum of 40 bits to a maximum of 64 bits re-

quired.

Output: 64 bits min. (last 2 bits are 1, 1).

JAM Output: A pattern of 1, 0 is sent to the other segment if a

Minimum Packet Repeated: 96 bits including preamble (Packet fragments are

FAULT Protection: Each segment will disconnect itself from the other

FRONT PANEL INDICATORS

PWR

XCVR PWR

collision occurs on one of the segments.

extended using the JAM [1, 0] data pattern).

segments if 32 consecutive collisions occur, or if
the collision detector of a segment is on for longer
than approximately 2.4 ms. This FAULT protec­tion will reset automatically after one packet is
transmitted onto the FAULT protected segment
without causing a collision.

Indicates that the repeater is receiving power.

Indicates that the repeater is providing power to the
transceiver connected to the repeater.

JAM

FRONT PANEL INDICATORS (CONT)

Indicates the MR-2000C is propagating a collision
on one segment to the other segment connected to
the repeater.

NOTE