Digital Equipment DECrepeater 90FA Owner's Manual

DECrepeater90FA Owner’sManual

Order Number: EK–DEFAR–OM. B01

Revision/Update Information: This is a revised manual.

Digital Equipment Corporation Maynard, Massachusetts

First Edition, September 1992 Second Edition, January 1994

Possession, use, or copying of the software described in this publication is authorized only pursuant to a valid written license from Digital or an authorized sublicensor.

Digital Equipment Corporation makes no representations that the use of its products in the manner described in this publication will not infringe on existing or future patent rights, nor do the descriptions contained in this publication imply the granting of licenses to make, use, or sell equipment or software in accordance with the description.

Restricted Rights: Use, duplication, or disclosure by the U.S. Government is subject to restrictions as set forth in subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013.

frequency energy. The equipment has been type tested and found to comply with the limits for a Class A computing device pursuant to Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such radio frequency interference when operated in a commercial environment. Operation of this equipment in a residential area may cause interference, in which case the user at his own expense may be required to take measures to correct the interference.

The following are trademarks of Digital Equipment Corporation: BI, DEC, DECbridge, DECconnect, DECmcc, DECnet, DECserver, Digital, LAT, MicroVAX, ThinWire, ULTRIX, UNIBUS, VAX, VAX–11/780, VAX–11/785, VAX 3600, VAX 3900, VAX 6000, VAX 6300, VAX 6400, VAX 9000, VAXcluster, VAX DOCUMENT, VAXELN, VAXstation, VMS, VT, and the DIGITAL logo.

ST is a registered trademark of American Telephone & Telegraph Company. All other trademarks and registered trademarks are the property of their respective holders.

This document was prepared using VAX DOCUMENT Version 2.1.

Contents

About This Manual ...................................... vii

1 Overview

Features ............................................. 1–1

LEDs and Connectors . . . ............................... 1–2

2 Conﬁguring the DECrepeater 90FA

Conﬁguration Rules .................................... 2–1

Segment Length Constraints . . . ....................... 2–1

Network Constraints . ............................... 2–2

Installed Fiber Constraints ........................... 2–5

3 Installation

Site Considerations .................................... 3–1

Standalone Installation . . ............................... 3–1

Mount the DECrepeater 90FA on a Wall . . ............... 3–2

Standalone Installation Connections .................... 3–4

Backplane Installation . . . ............................... 3–6

4 Managing the DECrepeater 90FA

Functions ............................................ 4–1

Components Needed .................................... 4–1

Accessing MOP from VMS Systems . ....................... 4–2

Accessing a Bridge Repeatedly . . ....................... 4–3

Accessing MOP from ULTRIX Systems ..................... 4–3

Console Carrier User Interface ........................... 4–4

Console Carrier Command Language ....................... 4–4

Description of Command Parameters .................... 4–6

Description of Commands ............................... 4–7

iii

Typical Management Techniques . . . ....................... 4–13

Remote Network Management with the DECbridge 90 ...... 4–14

Management Disconnect ............................. 4–14

Management Session . ............................... 4–15

Example of a Typical Management Session ............ 4–15

If Problems are Reported . . . ....................... 4–16

To Disable a Port . ............................... 4–17

To Reset the Repeater ............................ 4–17

Error Messages ....................................... 4–18

Standalone Conﬁguration Management ..................... 4–20

5 Troubleshooting

Port Partitioning ...................................... 5–1

DECrepeater 90FA Standalone Troubleshooting .............. 5–3

DECrepeater 90FA Backplane Troubleshooting ............... 5–8

A Speciﬁcations and Parts List

AUI Connector Pin Assignments . . . ....................... A–4

Parts List ............................................ A–5

B Management Details

Designating a Hub Manager ............................. B–1

Annotating the Bridge Address Table ...................... B–2

Using the WGB Address Table for Work Group Management .... B–3

C Related Documentation

Ordering Information ................................... C–1

Continental USA and Puerto Rico ...................... C–1

New Hampshire, Alaska, and Hawaii ................... C–1

Outside the USA and Puerto Rico ...................... C–1

Digital Personnel ................................... C–2

Index

Figures

1–1 DECrepeater 90FA LEDs and Connectors .......... 1–2

2–1 DECrepeater 90FA Repeater Path ............... 2–3

2–2 DECrepeater 90FA Typical DEChub 90 Conﬁguration

........................................... 2–4

3–1 Removing the Back Cover ...................... 3–2

3–2 Mounting Screws ............................. 3–3

3–3 Standalone Installation . ....................... 3–5

3–4 Installing the DECrepeater 90FA into the DEChub

90......................................... 3–7

4–1 Sample Conﬁguration . . ....................... 4–13

4–2 Typical Network Topology Map . . . ............... 4–15

Tables

1–1 DECrepeater 90FA LEDs and Connectors .......... 1–3

2–1 Segment Lengths ............................. 2–1

4–1 Ethernet Circuit Names for Systems .............. 4–2

4–2 Summary of DECbridge 90FA Commands .......... 4–5

4–3 DECbridge 90 Messages . ....................... 4–18

5–1 DECrepeater 90FA Status Indicators .............. 5–2

5–2 DECrepeater 90FA Fiber-Link Indicators .......... 5–2

5–3 Troubleshooting a DECrepeater 90FA Standalone

Unit ....................................... 5–3

5–4 Troubleshooting a DECrepeater 90FA in a DEChub 90

Backplane . . . ............................... 5–8

A–1 Physical Dimensions . . . ....................... A–1

A–2 Operating Environment . ....................... A–2

A–3 Shipping Environment . . ....................... A–2

A–4 Power Speciﬁcations ........................... A–3

A–5 DECrepeater 90FA Input ....................... A–3

A–6 Parts List ................................... A–5

About This Manual

This manual describes how to install, operate, and maintain the DECrepeater 90FA repeater. The DECrepeater 90FA is a three-port repeater designed to function as a standalone unit or as a managed unit in a DEChub 90 backplane.

In this manual, the DECrepeater 90FA unit may be referred to as the DECrepeater 90FA or the repeater.

Organization

This manual contains ﬁve chapters and three appendices.

Chapter Description

1 Provides an overview of the DECrepeater 90FA and brieﬂy describes

the product’s features.

2 Describes the conﬁguration rules and conditions of operation for the

DECrepeater 90FA in a ThinWire Ethernet system or ﬁber-optic

network. 3 Describes how to install the DECrepeater 90FA. 4 Describes how to manage the DECrepeater 90FA. 5 Provides basic troubleshooting information. Appendix A Provides the physical dimensions, environmental (operating and

shipping) speciﬁcations, electrical speciﬁcations, and a parts list. Appendix B Provides more detailed information on management issues. Appendix C Provides a list of related documentation and ordering information.

vii

Conventions

The following conventions are used in this manual:

Convention Meaning

Note Provides general information.

[] In command descriptions, brackets indicate

variables In command descriptions, italic type indicates a

SHOW ADDRESS In text, commands are shown in all uppercase

DECbridge>

SHOW REPEATER 1

A number in a black circle in text refers to the corresponding number in an accompanying ﬁgure.

optional elements.

variable that you supply.

letters to differentiate them from regular text. For VMS operating systems, you can enter commands in either uppercase or lowercase letters. For ULTRIX operating systems, commands must be entered as indicated in the examples.

Text that the system displays on the screen is shown in monospaced type.

Text that you enter is shown in bold monospaced type.

viii

Overview

This chapter describes the DECrepeater 90FA repeater and brieﬂy summarizes the features of this repeater.

The DECrepeater 90FA is a three-port repeater designed for IEEE 802.3 standard CSMA/CD networks. The DECrepeater 90FA has one ThinWire port, one ﬁber-optic port, and one 15-pin AUI port. The ThinWire port complies with the IEEE 802.3 standard for 10Base2 networks; the ﬁber-optic port complies with the IEEE 802.3 standard for 10Base-FL networks; and the AUI port complies with the IEEE 802.3 standard for Attachment Unit Interfaces. The 10Base-FL standard allows backward compatibility of the DECrepeater 90FA to Fiber Optic Inter Repeater Link (FOIRL) compliant products.

The DECrepeater 90FA can operate in a standalone conﬁguration or as a managed repeater when installed in a DEChub 90 backplane with a DECbridge 90 series bridge.

When operating as a standalone unit, the DECrepeater 90FA is an unmanaged repeater with a separate power supply connected to the repeater by a cable with a 7-pin connector. The auto-ranging power supply is modular and accommodates either a North American 120-volt or an international 240-volt wall outlet.

Features

The following list summarizes the main features of the DECrepeater 90FA:

• One ThinWire (10Base2) port

• One ﬁber-optic link (10Base-FL) port

• One 15-pin AUI Ethernet port

• Standalone or installable in a DEChub 90 backplane

• Manageable when installed in a DEChub 90 backplane For detailed information about how to conﬁgure the DECrepeater 90FA, see

Chapter 2, Conﬁguring the DECrepeater 90FA. For detailed information about how to install and use the DECrepeater 90FA, see Chapter 3, Installation.

Overview 1–1

LEDs and Connectors

The front panel of the DECrepeater 90FA contains several indicator lights (LEDs) and connectors. These LEDs and connectors are described in Table 1–1 and are shown in Figure 1–1.

Figure 1–1 DECrepeater 90FA LEDs and Connectors

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1–2 Overview

ORG

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Table 1–1 DECrepeater 90FA LEDs and Connectors

DC OK monitors the voltage. On: The +5.0 Vdc and +12.0 Vdc voltage is normal. Off: The voltage is abnormal (as when a power failure occurs).

Network activity indicator monitors the network activity. On: There is network activity. Off: There is no network activity.

Port 0 status indicator monitors the status of port 0. On: Port 0 is functional. Off: Port 0 is not functioning or has been partitioned. Flashing: Port 0 has been partitioned by management.

Port 1 status indicator monitors the status of port 1. See Table 5–1 in

Chapter 5, Troubleshooting, for more information.

On: Port 1 is functional. Off: Port 1 is not functioning or has been partitioned. Flashing: Port 1 has been partitioned by management.

Fiber-link status indicator monitors the optical link status of port 1.

See Table 5–2 in Chapter 5, for more information.

On: The link is operational. Off: The link is not functioning.

Port 2 AUI status indicator monitors the status of port 2. On: The port is operational. Off: The port is not functioning. Flashing: The port has been partitioned by management.

Fiber-optic transmit connector connects to the receive port of the other

ﬁber-optic device.

(

)

Fiber-optic receive connector connects to the transmit port of the other ﬁber-optic device.

Port 0 network connector (BNC) connects the repeater to the work group ThinWire segment. Not used when the repeater is installed in the DEChub 90 backplane.

Port 2 Backbone Port AUI connector provides AUI connection to the backbone port of the DECrepeater 90FA.

Power connector receives +5.0 V and +12.0 V from the DECrepeater 90FA power supply. Not used when the repeater is installed in the DEChub 90 backplane.

Backplane connector provides network and power connections to the DECrepeater 90FA when it is installed in the DEChub 90 backplane.

Back cover covers the backplane connector and mounting assembly. (Use with standalone units only.)

Overview 1–3

Conﬁguring the DECrepeater 90FA

This chapter contains some of the basic conﬁguration rules and guidelines that must be followed to correctly install the typical DECrepeater 90FA conﬁgurations. For more detailed information about installing IEEE 802.3 compliant multisegment LANs, refer to Section 13 of the IEEE 802.3i-1990 standard.

Conﬁguration Rules

The two basic constraints in IEEE 802.3 LAN conﬁgurations are segment lengths and the number of repeaters between data terminal equipment (DTE). To ensure the proper operation of the IEEE 802.3 physical layer and access methodology, the network size must meet the round trip propagation delay budget.

Segment Length Constraints

Table 2–1 speciﬁes the maximum segment lengths for the four possible types of media.

Table 2–1 Segment Lengths

Media Type Maximum Segment Length (Meters)

Mixing (coaxial) 10Base2 (ThinWire) 185

10Base5 500 Link 10BaseT (twisted-pair) 100

FOIRL (ﬁber) 1000

10Base-FL (ﬁber) 2000 AUI Transceiver cable 50

Conﬁguring the DECrepeater 90FA 2–1

Network Constraints

The overall network is constrained by the following IEEE 802.3 rules:

1. The transmission path between any two DTEs may consist of up to ﬁve

segments and four repeater sets (Figure 2–1). When a network consists of ﬁve segments and four repeater sets, a maximum

of three of these segments may be mixing (coaxial) segments.

2. The total of all segments (up to ﬁve) shall not exceed 2500 meters. Figure 2–1 shows an example of the maximum number of repeaters on a path

using coaxial segments and 10Base-FL segments.

2–2 Conﬁguring the DECrepeater 90FA

Figure 2–1 DECrepeater 90FA Repeater Path

DECrepeater 90FL

DECrepeater 90FA

10Base-FL Link Segment 100 m

MAU

AUI

DTE

Fiber-Optic Link Segment 500 m

Coax 10Base5 Segment 500 m

AUI AUI

DECrepeater 90FA

10Base2 Segment 185 m

MAU

AUI

DTE

Fiber-Optic Link Segment 500 m

DECrepeater 90FA

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Conﬁguring the DECrepeater 90FA 2–3

Figure 2–2 shows a DEChub 90 extended LAN conﬁguration.

Figure 2–2 DECrepeater 90FA Typical DEChub 90 Conﬁguration

DEChub 90

5 6

10BaseT (Twisted-Pair) Link Segment 100 m

DTE

DECrepeater 90FL

DECrepeater 90FA

DEChub 90

Fiber-Optic Link Segment 500 m

MAU

AUI

DTE

Fiber-Optic Link Segment 1000 m

Power Supply

10BaseT (Twisted-Pair) Link Segment 100 m

Power Supply

DECbridge 90FL

Fiber-Optic Link Segment 500 m

MAU

AUI

(ThinWire) Mixing Segment 185 m

DTE

Fiber-Optic Link Segment 1000 m

DEChub 90

5 6

DTEDTE

Power Supply

2–4 Conﬁguring the DECrepeater 90FA

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In this conﬁguration, the requirements of the network extend beyond the ﬁve segments and four repeaters allowed by the IEEE 802.3 rules. This conﬁguration is supported by using a bridge to create an extended LAN. The two LANs on either side of the bridge may each contain up to ﬁve segments and four repeaters; however, they are able to communicate with one another as if they were on a single LAN.

Installed Fiber Constraints

In addition to following the IEEE 802.3 rules that ensure proper protocol operation, the user must also ensure that the ﬁber-optic cable plant is properly designed. Although the IEEE 802.3 standard allows for a maximum length of 1000 meters (FOIRL) or 2000 meters (10Base-FL), the ﬁber-optic segments may be limited by the following characteristics of installed ﬁber:

• Power budget

• Link-loss

• Wavelength

• Bandwidth The maximum link distance could be further restricted by the number of splices,

interconnects, and cross-connect administration points. Refer to the DECconnect System Fiber Optic Planning and Conﬁguration guide for instructions on how to calculate the link certiﬁcation value for each segment.

Conﬁguring the DECrepeater 90FA 2–5

Installation

Before you install the DECrepeater 90FA repeater, it is recommended that you read this entire manual to become familiar with the features and conﬁguration rules of the DECrepeater 90FA. If problems occur during installation, refer to Chapter 5, Troubleshooting. For additional information that may be useful during installation, refer to Appendix A, Speciﬁcations and Parts List.

The DECrepeater 90FA may be installed on a desk top or table, mounted on a wall by its back cover, or installed in a DEChub 90 backplane. The only tool required for installation is a screwdriver. The screwdriver is used to remove the back cover, which covers the backplane connector and mounting assembly, and to mount the repeater or the power supply on the wall.

Site Considerations

The DECrepeater 90FA and its power supply can be placed in various locations, including ofﬁce areas, computer rooms, or wiring closets, as long as the environmental requirements are met. These requirements are provided in Table A–2, Operating Environment, in Appendix A.

Standalone Installation

To install the DECrepeater 90FA on a desk top or table, make sure that the air circulation around the DECrepeater 90FA does not become obstructed by papers or other materials. Refer to the environmental speciﬁcations provided in Table A–2 in Appendix A.

Installation 3–1

Mount the DECrepeater 90FA on a Wall

To install the DECrepeater 90FA as a standalone wall-mount unit, perform the following procedure:

1. Remove the cover (if necessary).

a. Insert a small screwdriver into the top mounting hole on the cover

(Figure 3–1).

b. Lift the internal latch with the screwdriver, then pull the cover away and

down from the top of the unit.

Figure 3–1 Removing the Back Cover

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3–2 Installation

2. Use the mounting holes on the back cover to determine the placement for the

mounting screws on the wall (Figure 3–2).

3. Secure the back cover to the wall using the mounting screws.

Figure 3–2 Mounting Screws

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Installation 3–3

The screws should be tight enough to provide resistance if you try to remove the back cover from the wall. However, do not make the screws so tight that the cover is distorted or cannot be removed from the wall.

4. Remove the back cover from the wall.

5. Attach the back cover to the repeater.

6. Mount the repeater onto the mounting screws.

Standalone Installation Connections

To make the DECrepeater 90FA standalone installation connections, perform the following procedure and refer to Figure 3–3:

1. Connect the cable from the power supply to the 7-pin power connector on the

DECrepeater 90FA. Align the power symbol on the dc power connector with the power symbol on the DECrepeater 90FA and push straight in.

2. Connect the DECrepeater 90FA to the power source.

For 120/240 V power outlets, connect the power supply cord to the modular power supply, then to the wall outlet.

3. If desired, connect the Ethernet ThinWire segment to a T-connector; connect

the T-connector to the port 0 BNC network connector. Terminate the T-connector using a 50-ohm terminator or extend the Ethernet segment to the next device.

The port 0 status activity LED should be on or ﬂashing to indicate the amount of trafﬁc on the network. The LED intensity varies with the amount of trafﬁc: the more trafﬁc, the brighter the LED will appear.

4. Connect the AUI cable to port 2, if required by the application.

5. Connect the ﬁber-optic cables to port 1 using 2.5-millimeter ST type bayonet

connectors, if required by the application.

The DECrepeater 90FA is now installed.

3–4 Installation

Figure 3–3 Standalone Installation

T-Connector

Fiber Link

50-Ohm Terminator

To Fiber Network

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Installation 3–5

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Digital Equipment DECrepeater 90FA Owner's Manual

Specifications and Main Features

Frequently Asked Questions

User Manual