Digital Equipment VAXstation 2000, VAXmate, MicroVAX 2000 Network Manual

Workstations

and

Micro

VAX

2000

Network

Guide

Order

Number

EK-NETAB-UG-002

digital

equipment

corporation

maynard,

massachusetts

December

1986

October

1987

The information in this document is subject to change without notice and should not be construed as a
commitment by Digital Equipment Corporation.

Digital

EquipmentCorporationassumesno responsibility for any errorsthat may appear in thisdocument.

The

software,

ifany,

described

in this

documentisfurnished

undera

license

and may be usedor

copied

only

in accordance with the terms ofsuch

license.

No responsibility is assumedforthe use or

reliabUity

ofsoftware

or equipment that is not supplied by Digital Equipment Corporation or its affiliatedcompanies.

Copyright ©1986, 1987 by Digital Equipment Corporation.

All Rights Reserved.

The

READER'S

COMMENTS

form on th^ last page of this document requests the user's critital evaluation to

assist in preparing future documentation.

The following are trademarks of Digital Equipment Corporation:

DEBET

MicroVAX

UNIBUS

DEC

Microns

ULTRIX-32

DECconnect

PDP

ULTRIX-32m

DECmate

P/OS

VAX

DECUS

Professional

VAXcluster

DECwriter

Rainbow

VAXstation

DEQNA

RSTS

VMS

DEUNA

RSX

VT

DIBOL

RT

Work

Processor

MASSBUS

ThinWire

SDSBDSD

TM

ML-S754

^

Contents

Preface

vu

Chapter 1

Overview

What

MakesaNetwork?

1-1

Standard

Ethernet

1-1

ThinWire

Ethernet

1-1

Unshielded

Twisted-Pair

Ethernet

1-2

DECnet

1-3

Networking Capabilities of

ULTRIX

1-3

Local

Area

VAXclusters

1-4

Chapter

2

Setting

Up

the

Network

Standard

Ethernet

2-1

Basic ThinWire Components

2-2

ThinWire

Ethernet

Cable

2-3

Connectors

and

Terminators

2-5

Additional Equipment

2-6

DIGITAL

ThinWire Ethernet Multiport Repeater (DEMPR) . . .

2-6

DIGITAL ThinWire Ethernet Station Adapter

(DESTA)

2-7

DEBETs — The Ethernet Bridge

2-8

ThinWire Configurations

2-8

DECconnect Approach

2-9

Daisy-chain Approach

2-10

Combined Daisy-chain

and

DECconnect Approach 2-10

Single Segment Configuration 2-11

Multisegment ThinWire Configuration

2-13

ThinWire

Ethernet

Rules

2-14

Configurations Symbols 2-14

III

Single Segment ThinWire Ethernet 2-15
Stand-alone DEMPR

2-17

^

Combined Standard/ThinWire Ethernet LAN 2-18
Stand-alone Cascading DEMPRs

2-19

Stand-alone

DELNI

with

DEMPRs

2-20

Local Bridge 2-21

Disconnecting Stations from ThinWire Ethernet 2-22

Local Area

VAXcluster

Configuration 2-23

Chapter

3

Installing

ThinWire

Hardware

Before

You

Start

3-1

Determining Your Needs

3-1

ThinWire

Ethernet

Cable

3-1

Connectors

3-1

Barrel

Connectors

and

T-Connectors

3-2

DESTA

and

Transceiver

Cable

3-2

Terminators

3-2

DEMPR

3-2

Estimating Your Needs

3-2

Planning the ThinWire Segment

3-3

Setting the Switch for ThinWire Ethernet

3-4

Connecting to a ThinWire Ethernet Segment 3-4

Connecting VAXstation 2000, Micro

VAX

2000, or VAXmate

....

3-5

Connecting a Station with a Transceiver Cable

3-8

Connecting to an Existing ThinWire Network

3-12

How

to

InstallaDEMPR

3-12

Stand-alone

DEMPR

3-13

Connecting

the

DEMPR to Standard Ethernet

3-16

How to Lengthen a ThinWire Segment

3-16

How

to Verify Network Installation for a VAXstation 2000 or

MicroVAX

2000

3-17

How to Verify Installation for a VAXmate

3-18

Troubleshooting the ThinWire Segment

3-18

Troubleshooting the DEMPR

3-19

Troubleshooting the

DESTA

3-19

IV

Troubleshooting

Network

Software

3-19

Appendix A Associated Documents

Glossary

Index

Figures

2-1 Settingthe

Switch

for StandardEthernet 2-1

2-2 Connecting the Intermediary Cable 2-2

2-3

ThinWire

Ethernet

Cable

2-4

2-4

Connectors

2-5

2-5 DIGITAL ThinWire Ethernet Multiport Repeater (DEMPR). . .

2-6

2-6

DIGITAL

ThinWire Ethernet Station Adapter

(DESTA)

2-7

2-7

Symbols

for

Cables

2-8

2-8

DECconnect Method of Wiring 2-9

2-9

Single

SegmentConfiguration 2-11

2-10 Connecting

ThinWire

Ethernet to Standard Ethernet 2-12

2-11 Multisegment

ThinWire

Configuration 2-13

2-12 Symbols for Configurations 2-14

2-13

Single

Segment

ThinWire

Configuration 2-16

2-14

Stand-alone

DEMPR

with

ThinWire

Cables

2-17

2-15

DEMPR

on

Standard

Ethernet

2-18

2-16 Stand-alone Cascading

DEMPRs

2-19

2-17

Stand-alone

DELNI

with

DEMPRs

2-20

2-18

Local

Bridge

2-21

2-19 Disconnecting a Station from

ThinWire

Ethernet 2-22

_ 2-20 Local Area VAXcluster 2-24

3-1 Settingthe

Switch

for

ThinWire

Ethernet 3-4

3-2 Connectingthe T-connector to

ThinWire

3-5
3-3 Connectinga Terminator to the T-connector 3-6
3-4 Adding a Segment to the T-connector 3-6

3-5 Connecting the

T-connectortoVAXstation

2000

3-7 _

3-6

Connecting the T-connector to ThinWire

3-8

3-7

Connecting a Terminator to the T-connector

3-9

3-8

Adding a Segment to the T-connector 3-9

3-9

Attaching the T-connector to the

DESTA

3-10

3-10

Attaching the Transceiver Cable to the DESTA 3-11

3-11

ThinWire Cables Connected to the DEMPR

3-13

3-12 Attaching a Terminator to a

ThinWire

Segment

3-14

3-13

Terminator Connected to the DEMPR

3-15

3-14

Connecting Two ThinWire Sections 3-16

Tables

2-1 Ordering Information for ThinWire Ethernet Cables

2-4

3-1 Formto Order

ThinWire

Equipment 3-3

VI

Preface

This manual describes how to configure and install some simple ThinWire

Ethernet

networks

for VAXstation 2000, MicroVAX2000,orVAXmate systems.

It does not describe all possible configurations, but outlinesthe rules to

follow

when configuring your network with ThinWireEthernet.

Recommended

Reading

Path

1. VAXstation 2000 Hardware Installation Guide, MicroVAX 2000 Hardware

Installation

Guide,

or

VAXmate

System

Handbook.

You should install your

VAXstation

2000, or

VAXmate

system before installing ThinWireEthernet.

2.

Workstations

and

MicroVAX

2000

Network

Guide,

Chapter 2. This chapter

tells you how to configure your network.

3.

Workstations

and

MicroVAX

2000Network

Guide,

Chapter 3. This chapter

describes

how

to install ThinWire Ethernet

hardware

on

your

system.

A

glossary

at the end of the book

explains

technical

terms

usedin this

book.

Conventions

The following notices appear throughout this guide:

• Notes — Contain general or supplemental information about a topic.

• Caution — Contain information to prevent disruption of the network.

Convention

Meaning

Bold

Notes, cautions,

and

warnings are bolded.

Italics

Terms defined in the glossary are italicized the first

time

the

word appears in the text.

VII

Document

Structure

This manual consists of three chapters and an appendix.

• Chapter 1 gives an overview of ThinWire Ethernet, defines networks,

and

describes

DECnet,

ULTRIX

networks,

and

VAXclusters.

• Chapter 2

describes

the

basic

components you will need, some

simple

configurations, and the rules for connecting to ThinWire Ethernet.

• Chapter 3 describes how to determine your needs and how to install and

troubleshoot

a

Thin

Wire

Ethernet

network.

• Theappendixlistsassociated documents that mightbe helpfulin planning

your

network.

VIII

^

Chapter

1

Overview

Networks

are

useful

to

people

who

need to

work

together

and

share

information

but

still

want

the attractive features of their

own

workstation.

People

working

cooperativelyona

project

may

needtocommunicate

and

exchange

information,

share

common

data

bases,

share

files,oruseamail

system,

and

yet

keep

their

workstation

independent.

Networks

also

allow

you to share

devices,

suchas

laser

printers

or line

printers.

What

Makes

a

Network?

A

network

is a

group

of

computers

connected

by

communications

lines

to

share information and

resources.

You

need

special

network hardware and

software

to

connect

your network.

DECnet

software

enables

computers

to

formanetwork.

Standard

Ethernet

Ethernet is the

DIGITAL

local area network. Ethernetnetworks provide rapid

access

to data in remote locations, and the high data rate supported by

DIGITAL'S

DECnet software makes file transfers practical.

In

baseband

Ethernet

(StandardorThinWire),asingle

network

cable

replaces

the

numerous

interconnecting

cablesintraditional

data

networks.

Standard

Ethernet cable is recommended for commimications between floors and

buildings.

ThinWire

cable

is

recommended

for

communications

between

workstations,

personal

computers,

and

low-end

systemsinlocal

work

areas

onafloor.

ThinWire

Ethernet

ThinWire

is a

networking

cabling

system

and set of

products

that

deliver

10

megabits-per-second

Ethernet

to the

desk,

work

area,

and

local

area

systems

for

connection

of

personal

computers,

workstations,

network

servers,

and

low-end

computing

devices.

All

DIGITAL

Ethernet products can

connect

to

ThinWire

offering

an

alternative

wiring

approach

for

low-end,

mid-range.

Overview

1—1

and

high-end

systems

and

Ethernet

servers

without

any

changeinnetwork

performance.

, ^

ThinWire Ethernet is used in any size environment. It is ideal for a small
stand-alone network in which personal computer and workstation users
share resources, such as prmters and storage devices.

ThmWire

works

well as a small- to medium-sized stand-alone

local

area

network

(LAN)

in a small business or in a department of a larger organization where

personal

computer

and

workstation

users

need

local

resource

sharing

and

more

powerful

computing

resources.ALAN

isa high-speed

communications

network that covers a limited geographical area, such as a section of a

building, an entire building, or a

cluster

of buildings.

Unshielded

Twisted-Pair

Ethernet

The

Unshielded

Twisted-Pair

Ethernet

Adapter

delivers

10

megabits-per-

second

Ethernet

performance

to the

desktop,

work

area,

and

local

system

over unshielded twisted-pair building cable.

Unshielded tvdsted-pair adapters connect a

single

device,

•

DESTA

with

Micro

VAX

attached

•

VAXmate

•

VAXstation

2000

• Personal computer with DEPCA, DELUA, or DELQA Ethernet controllers

to the Ethernet network by means of the

DIGITAL

ThinWire Ethernet

Multiport Repeater

(DEMPR).

Small stand-alone local area networks, where a

personal

computer

and

workstation

usershare

limited

local

resources

(printers,

storage

devices),

can be connected as a subnetwork to large local area and

wide

area

networks.

Functionally, the

office

adapter and wiring

closet/SER

adapter work as a

pair to match the 50-ohm impedance on a ThinWire Ethernet coaxial cable

to the impedance on an unshielded twisted-pair cable. Thus, unshielded

tv«sted-pair building wiring can be used, in addition to ThinWire cable, to
run Ethernet to the desktop.

Unshielded Twisted-PairEthernet Adapters are compatiblewith the ThinWire

Ethernet products and

IEEE

802.3

specificationsfor "MediumAttachment Unit

and Baseband Medium Specifications for Type 10 Base 2."

1 —2

Workstations

and

MicroVAX

2Q00

Network

Guide

The

maximum

length of 24

AWG

unshielded twisted-pair

cable

that can be

used between the

office

adapter and the wiring closet adapter is 50 to 70

meters (164 to 230 feet).

DECnet

DECnet, a software product that enables many

DIGITAL

computer systems

to form a network, is derived from a well-defined network architecture called

the

DIGITAL

Network Architecture (DNA). DNA, similar to the standard

International Standards Organization

(ISO)

communication architecture, is

the

logical

structure that

provides

a

model

for

DECnet

implementations.

DECnet provides:

• Task-to-task communications — allows programs executing in different

systems to exchange information.

• File transfer — supports the copying of

files

among different systems.

• Remote file access — allows

the

user to read, write, delete, or modify

files on another system.

• Remote

command

file submission

and

execution — allows

one

computer

system

to

direct

another

system

to

execute

commands

and/or

perform

tasks.

• Down-line loading — allows programs developed on a system with

appropriate peripherals and

resources

to be sent to another

system,

such

as a small, memory-only system, for execution.

• The network virtual terminal — gives a user cormection to a remote

system;

the terminal operates as if it were connected to the

remote

system.

•

Network

management —

provides

for

monitoring

and

controlling

network

operation in a distributed environment.

Networking

Capabilities

of

ULTRIX

TCP/IP networking protocols are standard wth the

ULTRIX-32

software.

They are an integral part of the operating system and facilitate interaction

with Internet networks. Support includes

iMe

transfer, remote execution,

remote login, and resource-sharing capabilities with other systems running

the

TCP/IP

protocols.

DECnet-ULTRIX

provides an Ethernet-based communication link between

VMS

and

ULTRIX

operating systems.

ULTRIX

bridgesboth environmentsby

supporting the

coexistence

of the

DECnet

and TCP/IP

protocols.

DECnet

Overview

1-3

and TCP/IP can run simultaneously and share the same system

resoiwces,

such

as

the

DEUNA

and

DEQNA

Ethernet

interfaces.

This

feature

allows

a

DECnet-ULTRIX

system to act as an informal gateway between DECnet

networks

and

Internet

networks.

DECnet-ULTRIX

allows

ULTRIXtointeract

with other

DIGITAL

and

non-DIGITAL

operating systems, using

DECnet

products such as DECnet-RSX, DECnet-VAX, DECnet-DOS.

Local

Area

VAXclusters

The

computer

industry

today

provides

individuals

or

small

work

groups

in

organizations with their own personal computer systems or workstations,

solving the computing availability problem but creating a new set of

problems — managing large numbers of

geographicaUy

dispersed personal

workstations. Another problem for users is that they have inherited system

management responsibilities and need to have more knowledge of the

operating system to perform system management tasks.

The

Local

Area

VAXcluster

using ThinWire or standard Ethernet as the

interconnect allows

DIGITAL'S

low-end

VAX/MicroVAX

products to be

grouped in similar

VMS

worksystems, removing the problems of system

management on a per node basis and elevates it. to a single system

management domain. Except for the interconnect-dependent driver software,

the

same

VAXcluster

softwareisused

on

both

Cl-based

clusters

and

ThinWire

or

standard

Ethernet-based

clusters.

The

Local

Area

VAXcluster

systemalsosolvesthe problemsofinadequatedisk

space and data sharing among members of a group or team.

VAXclusters

provide distributed processing capabilities to allow load-sharing batch and
print processing across member nodes or to target a node, reducing the
amount of wasted or underutilized computes.

One other problem is MicroVMS has to be installed on every Micro

VAX

or

VAXstation.

In a LocalArea

VAXcluster,

the system requires no local software

installation and can be plugged into a suitable ThinWire or standard Ethernet

connection

and

be remotely booted, removing the

need

for local software

installation.

Special software allows membership in a

Local

Area

VAXcluster.

This

software provides flexibility by allowing many Local Area

VAXclusters

to

share the same Ethernet or ThinWire Ethernet segment

and

to allow nodes to

logically move from

pne

cluster to another.

1-4

Workstations

and

MicroVAX

2000

Network

Guide

Chapter

2

Setting

Up

the

Network

This

chapter

describes

the

basic

components

you

will

need,

some

simple

topologies,

and

the

rules

for

connectingasystemtoThinWire

Ethernet.

This

chapter

also

describes

howtoset

up

your

systemtoconnecttostandard

Ethernet.

Standard

Ethernet

To

use

standard

Ethernetonyour

VAXstation

2000,

move

the

Ethernet

switch

onthe

backofthe

system

unittothe

down

position

(Figure

2-1).

Figure

2-1: Setting the Switch for Standard Ethernet

UNDERNEATH

VIEW

BUTTON

ETHERNET

SWITCH

HALT

ICON

SettingUpthe

Network

2—1

Locate

the

Ethernet

intermediary

cable

(part

no.

1701860-01)

that

comes

with your

system

unit.

Connect

it to the

back

of the

system

unit as

shown

in Figure

2-2.

Figure

2-2:

Connecting

the

Intermediary Cable

INTERMEDtARV

ETHERNET

CABLE

Refertothe

DECconnect

documentation

for

more

informationonconnecting

your

system

to

standard

Ethernet.

Basic

ThinWire

Components

The

Ethernet

Module

containsatransceiver

that

allows

youtoconnect

your

system

to

ThinWire

Ethernet.

The

Ethernet

Module

is preinstalled in all

VAXstation

2000

and

VAXmate

systems.

If you want to

connectaMicro

VAX

2000

systemtoThinWire

Ethernet,

order

the

Ethernet

Module

preinstalled

or

contact

field

service

to

install

the

module.

The

Ethernet

Module

equipment

consists

of the

following:

•

One

Ethernet

Module

•

Two

terminators

•

One

T-connector

2—2

Workstations

and

MicroVAX

2000

Network

Guide

Contact your

DIGITAL

representative to order ThinWire cable lengths with

connectors

at

each

end.

If you prefer, you can purchase ThinWire Ethernet cable on a

Ispool

and cut

the cable to your needs. See the

VAXstation

2000/MicroVAX

2000

Maintenance

Guide for information on cutting and crimping ThinWire Ethernet cable.

Before reading about configurations, you need to know the following terms:

• Station — A single addressable device on a

Local

Area Network; for

example, a VAXstation 2000, Micro

VAX

2000, or

VAXmate.

• Section — A single continuous piece of coaxial cable.

• Segment — Any number of ThinWire sections joined by

barrel

connectors

or T-connectors to form a single, continuous cable.

ThinWire

Ethernet

Cable

ThinWire Ethernet cable has a jacket of either polyvinyl chloride

(PVC)

or

Teflon. Either PVC or

Teflon

cable can be used in an open office area.

However, in the Uruted States, Teflon may be required for areas classified
by the Underwriter's Laboratory (UL) as environmental air spaces, such as

in air-conditioning ducts or air plenum. An air plenum is a compartment or

chamber to which

one

or more compartments are connected in a building

ventilation system

and

is only used for carrying envirorunental air. Check

your local building codes for more information.

ThinWire Ethernet cable delivers 10 megabits-per-second performance and

full Ethernet functionality.

The maximum length of a segment is 185 m (606 ft).

ThinWire Ethernet products adhere to the

IEEE

standard 802.3. ThinWire

Ethernet products are compatible with products that conform to this

international

standard.

ThinWire

Ethernet

cable

is:

•

Flexible

• Fully compatible with standard Ethernet

• Inexpensive

• High performance

SeningUpthe

Network

2-3

You can order ThinWire Ethernet cables in the following cable lengths:

Table

2-1:

Ordering

Information

for

ThinWire

Ethernet

Ca-

bles

Order

No.

Description

BC16M-06

ThinWire

Cable,

PVC,

6'

BC16M-15

ThinWire

Cable,

PVC,

15'

BC16M-30

ThinWire

Cable,

PVC,

30'

H8243-A ThinWire Cable, PVC, 1000' spool

H8244-A ThinWire Cable, Teflon, 1000' spool

Figure

2-3

shows the ThinWire Ethernet cable.

Figure

2-3:

ThinWire

Ethernet

Cable

2-4

Workstations

and

MicroVAX

2000

Network

Guide

Connectors

and

Terminators

The

ThinWire

connectors

andterminators youneedto

configure

your

network

follow:

•

T-connector

(H8223)

— A

3-way

connector

that

joins

two

ThinWire

Ethernet

cable

sections.

Thethird

opening

attaches

to a

VAXstation

2000,

MicroVAX

2000,

or

a VAXmate

system.

•

Terminator

(H8225)

— A

cormector

at the end of a

ThinWire

segment

that

provides

the

50-ohm

termination

resistance

needed

for

the

cable.

If

the ThinWire cable connects to a

DIGITAL

ThinWire Ethernet Multiport

Repeater

(DEMPR),

thenaterminatorisonly

neededatone

end

of

the

cable.

•

Barrel

connector

(H8224)

— A recessed connector that connects two

ThinWire

Ethernet

cable

sections.

Figure

2-4

shows

the

connectors

you

needtoconnecttoThinWire

Ethernet.

Figure

2-4:

Connectors

CONNECTOR

s

BARREL

CONNECTOR

T-CONNECTOR

CONNECTOR

SettingUpthe

Network

2-5

Additional

Equipment

Use the following equipment for additional configurations:

•

DIGITAL

ThinWire Ethernet Multipart Repeater(DEMPR-AA)

•

DIGITAL

ThinWire Ethernet StationAdapter (DESTA-AA)

• Ethernet Bridges (DEBET-AA)

DIGITAL

ThinWire

Ethernet

Multiport

Repeater

(DEMPR)

A

DEMPR

is a repeater, a

device

used to extend the length,

topology,

or

intercormection of the physical network medium beyond the limits imposed

by a single segment.

You

can connectup to eight ThinWire Ethernet segments to a single

DEMPR

to form a single Local Area Network. Or, you can connect a ThinWire LAN
to standard Ethernet through the

DEMPR.

Eachsegment can have 29 stations

(the 30th position is taken by the

DEMPR)

for a total of up to 232 stations.

Figure

2-5

shows

the

DEMPR.

The

DEMPR

offers:

• Support of up to eight ThinWire Ethernet connections

• Support of multiple Ethernet devices for each connection

• Easy installation

Figure

2-5:

DIGITAL

ThinWire

Ethernet

Multiport

Repeater

(DEMPR)

MLO-1321-87

2-6

Workstations

and

MicroVAX

2000

Network

Guide

DIGITAL

ThinWire

Ethernet

Station

Adapter

(DESTA)

The

DESTA

is an Ethemet/BEEE 802.3 transceiver that connects systems

(such

as the

Micro

VAX

II,

VAXstation

II,

VAXstation

II/GPX,

VAX

11/7XX,

VAX/8XXX,

Professional

300,

and

PDP-11)

to

ThinWire

Ethernet.

(A

transceiver is a

device

that provides a

single

physical

connection

betweerii

standard Ethernet

and

Ethernet communication equipment.)

The

DESTA

has two

ports:

one port

connects

to the

T-connector

connected to

ThinWire, a second port connects a transceiver cable that leads to a system.

Figure 2-6 shows a

DESTA.

The DESTA provides:

•

Connection

ofa

system

with a

transceiver

cabletoThinWire

Ethernet.

•

Attachment

to devices

connected

to

Ethernet

communication

controllers

by way of transceiver cables.

Figure

2-6:

DIGITAL

ThinWire Ethernet Station Adapter

(DESTA)

M.O-1322-87

SeningUpthe

Network

2-7

DEBETs

—

The

Ethernet

Bridge

Ethernet bridges

(DEBET)

connect standard Ethernet LANs to each other, thus

creating an extended LAN. An extended LAN configuration has the potential
to span a much greater area than a single standard Ethernet LAN.

DEBETs

provide network traffic control to prevent an extended LAN from

being overwhelmed by the combined traffic on each of its standard LANs.

DEBETs

confine local traffic in a standard Ethernet LAN. Only traffic that is

destined

for

another

standard

LAN

is

allowed

to

cross

over

the

DEBET.

ThinWire

Configurations

A ThinWire configuration is an economical way to connect VAXstation 2000s,
Micro

VAX

2000s, or VAXmates in a network configuration.

Figure

2-7

shows the symbols for cables used in the ThinWire configurations

in

this

section

of

the

book.

Figure

2-7:

Symbols

for

Cables

STANDARD

ETHERNET

COAXIAL

CABLE

THINWIRE

ETHERNET

COAXIAL

CABLE

TRANSCEIVER

CABLE

MLO-1323-87

Three ways to design a ThinWire configuration are:

1. DECconnect approach

2. Daisy-chain wiring approach

3. Combined DECconnect and Daisy-chain approach

2-8

Workstations

and

MicroVAX

2000

Network

Guide

DECconnect

Approach

The DECconnect approach to wiring uses a single ThinWire cable for each
machine. This approach is flexible

and

reliable. It is reliable since no other

machines come

between

your machine

and

the

central

equipment

room or

DEMPR. Consult your

DIGITAL

representative for more information about

DECconnect. The appendix lists the DECconnect documentation.
Figure

2-8

illustrates a single system on each ThinWire segment connected

toaDEMPR.

Figure

2—8:

DECconnect

Method

of

Wiring

VAXstation

2000

ThinWire

ETHERNET

MicroVAX
2000

VAXmate

SettingUpthe

Network

2-9