Cabletron Systems LR-2000 User manual

Brand: Cabletron Systems

Model: LR-2000

Category: Bridges & repeaters

Type: User manual

LR-2000

LOCAL REPEATER

USER'S MANUAL

CABLETRON SYSTEMS, P.O. Box 6257, E. Rochester, New Hampshire 03867

The Complete Networking Solution

Inc.

POWER SUPPLY CORD

The main 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 main 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 mm

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 mm

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.

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 February 1990 by

Cabletron Systems Inc.

P.O. Box 6257, E. Rochester, NH 03867-6257

Printed in the United States of America

Order number: 9030004-02 Feb. 90

LANVIEW, LR-2000 and LAN-MD are trademarks of Cabletron Systems Inc.

FCC NOTICE

This device complies with Part 15 of 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.

WARNING: This equipment uses and generates and can radiate radio frequency energy

and if not installed properly and used in accordance with the instruction manual, may

cause interference to radio communications. It has been tested and found to comply with

the limits for a Class A digital device pursuant to Subpart J, of Part 15, of FCC Rules,

which are designed to provide reasonable protection against such interference in a

commercial environment. Operation of this equipment in a residential area is likely to

cause interference in which case the user at his own expense will be required to take

whatever steps may be necessary 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 LR-2000 with respect to the antenna.

• Move the LR-2000 away from the receiver.

• Plug the LR-2000 into a a different outlet so that the repeater and the receiver are on

different branch circuits.

If necessary, the user should consult the dealer or an experienced radio/television

technician for additional suggestions. The user may find the following booklet prepared by

the Federal Communication Commission helpful:

“How to Identify and Resolve Radio TV Interference Problems”

This booklet is available from the U.S. Government Printing Office, Washington D.C.

20402 - Stock No. 004-000-00345-4

CONTENTS

CHAPTER PAGE

CHAPTER 1 - INTRODUCTION

1.1 USING THIS MANUAL ........................................................................................1-1

1.2 GETTING HELP....................................................................................................1-1

1.3 THE LR-2000 LOCAL REPEATER ......................................................................1-2

1.4 RELATED USER MANUALS ...............................................................................1-2

CHAPTER 2 - INSTALLATION REQUIREMENTS/SPECIFICATIONS

2.1 NETWORK DESIGN GUIDELINES....................................................................2-1

2.2 LOCATION GUIDELINES ...................................................................................2-1

2.3 SPECIFICATIONS ................................................................................................2-2

CHAPTER 3 - CONNECTING THE LR-2000

3.1 UNPACKING THE LR-2000 .................................................................................3-1

3.2 CONNECTING THE LR-2000 TO YOUR NETWORK........................................3-1

CHAPTER 4 - TESTING AND TROUBLESHOOTING

4.1 INSTALLATION CHECK-OUT ............................................................................4-1

4.2 USING LANVIEW .................................................................................................4-2

iii

Page 1 - 1

INTRODUCTION

CHAPTER 1

INTRODUCTION

Welcome to the Cabletron Systems LR-2000 Local Repeater User Manual. We have

designed this manual to serve as a simple installation and reference guide for the

LR-2000. The LR-2000 allows users to expand their networks, utilizing any Ethernet

transmission media, while maintaining the integrity of data packets passing through the

network. This unit fully conforms to IEEE 802.3 specifications and provides the flexibility

to interconnect networks using Ethernet Version 1, Version 2, and/or IEEE 802.3

equipment.

You should read this manual thoroughly to gain a full understanding of the LR-2000 and

its capabilities

1.1 USING THIS MANUAL

Chapter 1, Introduction, discusses the capabilities of Cabletron Systems' LR-2000 Local

Repeater. The chapter concludes with a list of related user manuals.

Chapter 2, Installation Requirements/Specifications, contains a list of hardware,

software, location, and environmental requirements that must be met before installing the

LR-2000. It also contains the operating specifications for the LR-2000.

Chapter 3, Installing the LR-2000, contains steps for unpacking the LR-2000, connecting

network segments to the LR-2000 via the appropriate transceivers, and powering the

unit up.

Chapter 4, Testing and Troubleshooting, contains procedures for checking the

proper installation of the LR-2000, and a description of the LANVIEW LEDs and

their function.

You should have a general working knowledge of Ethernet or IEEE 802.3 type data

communications networks and their physical layer components before installing the

LR-2000 on your network.

1.2 GETTING HELP

If you need additional support related to Cabletron Systems' LR-2000, or if you have any

comments, 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: (603) 332-9400

INTRODUCTION

Page 1 - 2

1.3 THE LR-2000 LOCAL REPEATER

The LR-2000 easily connects two network segments, in any combination, made of a variety

of Ethernet transmission media, including 10BASE-T Twisted Pair, Fiber Optic, and thick

or thin Coaxial Cabling. The segments are connected by first attaching an external

transceiver to each segment that will be connected to the LR-2000. An attachment unit

interface (AUI) cable is then used to connect the transceiver on each segment to the AUI

ports located on the rear of the repeater. The two segments are linked when they are

attached to the repeater.

The LR-2000, being an IEEE 802.3 compliant repeater, will transmit re-timed data

packets, regenerate preambles, extend collision fragments, automatically partition

problem segments, and automatically reconnect non-problem segments. If a problem

develops on a segment connected to the LR-2000, just those devices on that segment will

be affected. Once the problem is corrected, those devices will automatically be reconnected

to the network.

The LR-2000 incorporates Cabletron Systems' LANVIEW diagnostic and monitoring

system. LANVIEW is a series of LEDs incorporated into all Cabletron Systems' products.

Should a problem arise, troubleshooting of power failures, collisions, cable faults or many

other problems can be diagnosed rapidly by using a series of LEDs.

1.4 RELATED USER MANUALS

The manuals listed below should be used to supplement the procedures and other

technical data provided in this manual. The procedures contained in these manuals will

be referenced, rather than repeated in this manual.

• Cabletron Systems' TPT-T 10BASE-T Twisted Pair Transceiver User's Manual

• Cabletron Systems' FOT-F Fiber Optic Transceiver User’s Manual

• Cabletron Systems' ST-500 Coaxial Transceiver User’s Manual

• Cabletron Systems' TMS-3 Thin-net Transceiver User’s Manual

• Cabletron Systems' LAN-MD Portable Ethernet Tester User’s Manual

Page 2 - 1

INSTALLATION REQUIREMENTS/SPECIFICATIONS

CHAPTER 2

INSTALLATION REQUIREMENTS/SPECIFICATIONS

This chapter lists the location and network requirements needed for connecting the

LR-2000 to your network. No special skills or tools are required to install the unit on an

Ethernet network. This chapter also lists the specifications and power requirements for

the LR-2000.

Review all specifications and requirements in this chapter before you install the LR-2000.

If you do not, unsatisfactory network performance may result.

2.1 NETWORK DESIGN GUIDELINES

You must follow the network design guidelines listed in this section. If you do not,

unsatisfactory performance may result.

• The transceivers to which the LR-2000 will be connected must meet IEEE 802.3

standards and must have the SQE test function disabled.

• The AUI cables connecting the LR-2000 to the transceivers on the network must be

IEEE 802.3 type cables and must not exceed 50 meters (164 feet) in length.

• From its source address to its destination address, a data packet may pass through

four repeaters.

2.2 LOCATION GUIDELINES

The following guidelines must be followed to select a site for the LR-2000 Local Repeater.

If not, unsatisfactory network performance may result.

• An unrestricted free surface area of 53.34 cm (21 in) wide, 45.72 (18 in) deep and

15.24 cm (6 in) high is needed.

• A USA standard 3 prong power receptacle must be located within 2.13 m (7 ft) of

the site.

• If a shelving unit is to be used, it must be able to support 13.61 kg (30 lbs) of

static weight.

• The temperature of the location must be maintained between 5° and 40° C (41° and

104° F). Temperature changes of greater than 10° C (50° F) per hour must not occur.

Page 2 - 2

INSTALLATION REQUIREMENTS/SPECIFICATIONS

2.3 SPECIFICATIONS

This section contains the specifications for the Cabletron Systems LR-2000 Local

Repeater. Cabletron Systems reserves the right to change these specifications at any time

without notice.

GENERAL

Delay Times: (any segment in to all segments out)

Parameter: Typical Worst

Value Case

Start of Packet: 500 ns 600 ns

Collision to JAM:

Receive Mode 200 ns 300 ns

Transmit Mode 500 ns 625 ns

Preamble:

Input: Minimum of 20 bits required.

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

JAM output: A pattern of 1, 0 is sent to one or both of the

segments if a collision occurs.

Fragment Extension: Any packet less than 96 bits long. (Packet

fragments are extended using the JAM [1, 0]

data pattern).

FAULT Protection: Each segment will disconnect itself from the other

segment 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.

LANVIEW LEDs

PWR Indicates that the LR-2000 is receiving power.

XCVR PWR Indicates that the LR-2000 is providing power to

the transceivers connected to it.

JAM Indicates that the LR-2000 is propagating a

collision on one segment to the other segment

connected to the repeater.

Page 2 - 3

INSTALLATION REQUIREMENTS/SPECIFICATIONS

LANVIEW LEDs (Cont.)

NOTE: There is one RECEIVE, COLLISION, and FAULT LED for each segment.

RECEIVE Indicates that the LR-2000 is receiving a data

packet on that segment.

COLLISION Indicates that a collision is occurring on

that segment.

FAULT Indicates that the LR-2000 has electrically

disconnected that segment from the network due

to a cable fault or 32 consecutive collisions.

AUI INTERFACE (PORT 1 AND 2)

Type: 15 position D type receptacle (Fig. 2-1).

Pin 1 Logic Ref. Pin 9 Collision -

2 Collision + 10 Transmit -

3 Transmit + 11 Logic Ref.

4 Logic Ref. 12 Receive -

5 Receive + 13 Power (+12 Vdc)

6 Power return 14 Logic Ref.

7 No Connection 15 No Connection

8 Logic Ref.

Connector Shell: Protective Ground

Figure 2-1. Pinout Connections

POWER SUPPLY REQUIREMENTS

Note: The LR-2000 automatically differentiates and selects for the proper input voltage.

Parameter Typical Worst

Value Case

Input Voltage Vac 47-63 Hz

120 Volts Input: 0.3 A @ 120 V 0.5 A @ 90 to 130 V

220 Volts Input: 0.15 A @ 220 V 0.25 A @ 180 to 250 V

Input Current: 0.25 amp 1.0 amp

Output Voltage: 12 Vdc 11.5 to 15.5 Vdc

Page 2 - 4

INSTALLATION REQUIREMENTS/SPECIFICATIONS

POWER SUPPLY REQUIREMENTS (Cont.)

Overload Protection

Input: (1) 3AG 3 amp fuse.

Output: (1) 3AG 1 amp fuse per AUI port.

ENVIRONMENTAL REQUIREMENTS

Operating Temperature: +5° to +40° C (41° to 104° F)

Non-operating Temperature: -30° to +90° C (-86° to 194° F)

Operating Humidity: 5 to 95% (non-condensing)

SAFETY

WARNING: It is the responsibility of the person who sells the system of which the

LR-2000 will be a part of to ensure that the total system meets allowed limits of

conducted and radiated emissions.

Designed in accordance with UL478, UL910, NEC 725-2(b), CSA, IEC, TUV,

VDE 0871B. Meets FCC part 15, Subparagraph J, Class B limits.

SERVICE

MTBF (MHBK-217D): > 100,522 hrs. projected.

MTTR: <0.5 hrs.

PHYSICAL

Dimensions: 8.13 x 38.1 x 31.5 cm

(3.2H x 15.0W x 12.4D inches)

Weight

Unit: 3.17 kg (7 lbs)

Shipping: 3.63 kg (8 lbs)

CONNECTING THE LR-2000

Page 3 - 1

CHAPTER 3

CONNECTING THE LR-2000

This chapter contains instructions for connecting Cabletron Systems' LR-2000 Local

Repeater onto your network. Check that all requirements listed in Chapter 2,

Installation Requirements/Specifications, are met before installing the LR-2000.

3.1 UNPACKING THE LR-2000

Unpack the LR-2000 as follows:

1. Carefully remove the repeater from shipping box.

2. Slide the two foam end caps off the repeater.

3. Remove the repeater from protective plastic bag and set the repeater aside in a

safe place. Save the shipping box and materials in the event that the unit has to

be reshipped.

4. Remove the plastic bag containing the accessory package and check that it contains

the following items:

• One 8 foot USA power cord.

• One cable support bracket.

• Two 8-32 x .375 in. screws.

• Three 6 in. cable ties.

3.2 CONNECTING THE LR-2000 TO YOUR NETWORK

The LR-2000 is designed to be easily connected to your network without the use of any

special tools or equipment.

Connect the LR-2000 to the network as follows:

1. Using the two 8-32 screws (3, Fig. 3-1), attach the cable support (2) to the

repeater (1).

2. Place the repeater on the selected site. Be sure that the site meets the guidelines

listed in Section 2.2.

CAUTION: Ensure that the external transceivers to which the LR-2000 will be connected

has the signal quality error (SQE or “heartbeat”) test function disabled. The LR-2000 will

not operate if the transceivers have the SQE test function enabled, and the network will be

unusable. Refer to the applicable transceiver manual.

3. Attach an external transceiver (1, 9 Fig. 3-2) to each network segment that the

LR-2000 (4) will be connected to. Refer to the applicable transceiver manual.

CONNECTING THE LR-2000

Page 3 - 2

Figure 3-1. Cable Support Installation

4. Attach an AUI cable (2, 8), no longer than 50 meters in length, to both transceivers

connected in step 3.

5. Connect the AUI cable (2) from transceiver 1 (1) to AUI port 1 (3), located on the

back side of the LR-2000.

6. Connect the AUI cable (8) from transceiver 2 (9) to AUI port 2 (5).

7. Plug the power cord (7) into the power receptacle (6) located on the back side of

the repeater.

8. Plug the power cord into a wall receptacle.

9. Turn the power switch, located next to the power receptacle, to the ON position.

The PWR LED, indicating that the repeater is receiving power, and the XCVR PWR

LED, indicating that the repeater is providing power to the transceivers connected to

it, should be lit.

10. Using the cable ties provided, strain relief both AUI cables and the power cord to the

cable supports located on the back side of the repeater.

The LR-2000 is now ready for operation. It is recommended that the connections be tested

prior to transmitting data. Refer to Chapter 4, Testing and Troubleshooting.

Page 4 - 1

TESTING AND TROUBLESHOOTING

CHAPTER 4

TESTING AND TROUBLESHOOTING

This chapter lists procedures to test the LR-2000 Local Repeater after it has been

connected to the network. A description of LANVIEW and its function in troubleshooting

physical layer network problems is also given.

4.1 INSTALLATION CHECK-OUT

This section contains procedures to test the LR-2000 Local Repeater after it has been

installed to ensure that the the physical layer of the network is operating properly. Two

Ethernet node testers that will generate valid data packets, such as Cabletron Systems'

LAN-MDs, are required for this procedure.

Before you begin, test each segment connected to the repeater to ensure that the segment

meets IEEE 802.3 specification limits.

1. Using a transceiver (1, Fig. 4-1) and an AUI cable, connect a LAN-MD (2) to either of

the segments connected to the LR-2000 (3).

2. Select and run test 6 - SERVER.

3. Verify that the Test Status PASS LED is lit and that the status code reads 000 or

001. If these two conditions are met, this LAN-MD now acts as a SERVER unit and

will act as a packet echoer when used with another LAN-MD.

4. Using a transceiver (5) and an AUI cable, connect another LAN-MD (4) to the other

segment connected to the LR-2000.

5. Select and run test 4 - NODE on the LAN-MD connected in step 4.

6. Verify that this test passes. At least 100 packets should be sent and received with no

errors. The packets will be received from and sent back to the LAN-MD acting as

the SERVER.

When the LR-2000 Local Repeater has successfully completed these tests, it is ready

for normal operation. If any failures were noted, please contact Cabletron Systems'

Technical Support.

Page 4 - 2

TESTING AND TROUBLESHOOTING

Figure 4-1. Checkout Configuration

4.2 USING LANVIEW

The LR-2000 Local Repeater system uses Cabletron Systems' built-in visual diagnostic

and status monitoring system, LANVIEW. Using LANVIEW, a network troubleshooter

can quickly scan the LANVIEW LEDs to observe network status or to diagnose network

problems to determine which node or segment is faulty.

The following section discusses the function and the purpose of each LANVIEW LED on

the LR-2000. Refer to Figure 4-2.

Power (PWR) LED

When lit, this green LED indicates that the LR-2000 is receiving power. If this LED is not

lit, the problem may be with the input power or the LR-2000.

Transceiver Power (XCVR PWR) LED

When lit, this green LED indicates that the LR-2000 is providing power to the external

transceivers connected to the LR-2000. If this LED is not lit, power is not being provided

to one or both of the transceivers, and the problem may be in the LR-2000.

Page 4 - 3

TESTING AND TROUBLESHOOTING

Figure 4-2. LANVIEW LEDs

Jam (JAM) LED

This red LED normally flashes on and off to indicate that the LR-2000 is propagating a

collision from the segment on which the collision is occurring to the other segment

connected to the repeater. When this LED flashes, a pattern of 1,0 is sent to each segment

to indicate that a collision is occurring on one of the segments. What will be observed is

that the COLLISION LED for one segment will flash, indicating a collision, causing the

JAM LED to flash.

NOTE: There is one Receive, Collision, and Fault LED for each port on the LR-2000.

Receive (RECEIVE) LED

This yellow LED normally flashes on and off to indicate that the LR-2000 is repeating the

data packet being received from that segment. The rate at which the LED flashes will

increase as network activity increases.

Collision (COLLISION) LED

This red LED normally flashes on and off to indicate that a collision is occurring on the

indicated segment. The rate at which the LED flashes will increase as network activity

increases, since more collisions are likely occur.

Fault (FAULT) LED

A lit red FAULT LED indicates that the LR-2000 has disconnected that segment from the

network because 32 consecutive collisions have occurred on the segment, or because the

collision detector was on for longer than 2.4 ms. The FAULT LED will go out after one

packet is transmitted onto the segment with the fault without causing a collision.

Cabletron Systems LR-2000 User manual

Brand: Cabletron Systems

Model: LR-2000

Category: Bridges & repeaters

Type: User manual

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