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05.16Q: How do I recognize a broadcast storm?

A: That depends on what level it is occurring. Basically you have to

be aware of the potential for it beforehand and be looking for it,

because in a true broadcast storm you will probably be unable to

access the network. This can change dramatically for a higher

level protocol. NFS contention can result in a dramatic DROP in

Ethernet traffic, yet no one will have access to resources.

05.17Q: How can I prevent a broadcast storm?

A: Avoid protocols that are prone to it. Route when it is practical.

05.18Q: What is an Alignment Error ?

A: A received frame that does not contain an integer number of octets

and contains a frame check sequence validation error. A frame in

which the number of bits received is not an integer multiple of 8

and has a FCS (Frame Check Sequence) error. (802.3 standard, page

41)


05.19Q: What is *high* traffic on an Ethernet? 5%? 20%? 90%?

A: High traffic is when things start slowing down to the point they

are no longer acceptable. There is not set percentage point, in

other words. Xerox used to use a formula based on packet size over

time, or something, but the issue has been significantly muddied by

the plethora of protocols available and how they react to wire

usage. I usually start paying attention over 40-50%, *or when

things slow down*.

06.01Q: How can I test an Ethernet?

A: This depends on what level you want to test. The most basic test

(a.k.a., "the fire test") is to connect a pair of devices to the

network and see if they can communicate with each other. If you

want to test the electrical integrity of the wire (i.e., will it

carry a signal properly), a TDR or cable scanner that incorporates

TDR and other functions, would be the most comprehensive tool

(though a great deal cab be determined with a simple ohmmeter). If

you need to test the performance or troubleshoot protocol

transmission problems, you will need special and usually very

expensive software, usually coupled with custom hardware, to

capture, optionally filter, and analyze the network packets.

06.02Q: Is there a troubleshooting guide for Ethernet?

A: Yes, many. I suggest you check your local technical bookstore.

(Recommendations from the list would be appreciated!)

There are also some common sense steps you can take. [Volunteer

needed to fill this section out -- I think it's important but I'm a

little short on time at the moment to do it myself -mm]

06.03Q: What is a "TDR"?

A: A Time-Domain Reflectometer is a tool used to detect cable faults.

This device operates by sending a brief signal pulse down the cable

and looking for its reflection to bounce back. By analyzing the

reflected pulse, it is possible to make judgments about the quality

of the cable segment. More advanced units can not only detect and

identify the nature of the problem, but give a reasonably accurate

indication of the problem's location (distance from the point of

the test). There is also a device known as an OTDR, which is an

Optical Time-Domain Reflectometer for fiber-optic cables.

06.04Q: What means "BERT"?

A: Bit Error Rate Tester. This equipment is used to analyze the

amount and types of errors that occur on a cable segment.

06.05Q: What (free) tools are there to monitor/decode/etc an Ethernet?

A: There are many built into most Unix systems. For example, the ping

command can be used to determine if a given host is alive, and will

also tell you the round trip transmission time. ifconfig will tell

you the status of the network interfaces. netstat will summarize

statistics for network usage. spray will allow you to generate

network traffic directed at a particular host. Use "man

command-name" to learn more about a unix command. Using "man -k

network" may also provide leads to the tools provided by your unix

vendor.

Many more public domain tools are available for unix systems.



These include:

traffic: allows systems to graphically display network load

tcpdump: collect statistics and display individual packets

etherfind: ????

nfswatch: summarize/display traffic, particularly nfs packets

traceroute: determine the route between two hosts

Some cards for the PC come with utilities. There are several free

ones available, including ping (Clarkson University and others),

The Beholder (packet capture and display) and others.

07.01Q: Are there any other sources of information about Ethernet?

A: There are a LOT of information sources. Try to get the BIG-LAN

FAQ. One known anonymous FTP location is icarus.cns.syr.edu in

/information/big-lan. The big-lan.faq file is a kind of superset

to this ethernet faq. Another excelleny document is the network

reading list, "net-read.txt" (or "net-read.ps") by Charles

Spurgeon, available via anonymous FTP from ftp.utexas.edu. Cisco

Systems has a useful document: DOC-GLOSS part number 78-0888-01.

07.02Q: What books are good about Ethernet LAN's?

A: The IEEE 802.3 documents are considered the definitative source for

information on Ethernet. However, these may not be suitable for

all levels of users. Surprisingly, there are few good books

specifically dealing with Ethernet LANs, but here are a few that

you might find useful:

Local Area Networks, An introduction to the technology

by John E. McNamara, published by Digital Press, 1985

165 pps. with index and glossary, $29.00

ISBN 0-932376-79-7, Digital Press part number EY-00051-DP.

Network Troubleshooting Guide

by Digital Equipment Corporation, August 1990

Approx. 278 pps. with index and glossary, $95.00

Digital Press part number EK-339AB-GD-002.

These books and others are recommended in the network reading list,

net-read.txt, from ftp.utexas.edu.

07.03Q: Where can I get IEEE802.x docs online?

A: Nowhere. IEEE documents must be ordered from the IEEE themselves.

You can contact them at:

Institute of Electrical and Electronic Engineers

445 Hoes Lane

P.O. Box 1331

Piscataway, NJ 08855-1331

U.S.A.

(800) 678-IEEE



You can also get order information via e-mail to askieee@ieee.org.

07.04Q: Where can I get EIA/TIA docs online?

A: Nowhere. They must be ordered from:

Global Engineering

800-854-7179

(I am still trying to contact this vendor for more details.)

07.05Q: Where can I find the specifications of Ethernet equipment?

A: From the manufacturer of the product [hopefully!]. In the IEEE

802.3 documents for standard devices.

07.06Q: Where can I find IETF (Internet Engineering Task Force) documents?

A: These are available for anonymous FTP from a number of sites. The

cannonical location is ietf.cnri.reston.va.us in /ietf. Drafts are

at the same site in /internet-drafts.

Ethernet WEB-Sites





http://www.iaopennetworking.com/

Multicast und Broadcast Adressen


Type

Multicast Address Field Usage

01-00-1D-00-00-00 -802 Cabletron PC-OV PC discover (on demand)

01-00-1D-42-00-00 -802- Cabletron PC-OV Bridge discover (on demand)

01-00-1D-52-00-00 -802- Cabletron PC-OV MMAC discover (on demand)

01-00-5E-00-00-00 to

01-00-5E-7F-FF-FF 0800 DoD Internet Multicast (RFC-1112)

01-00-5E-80-00-00 to

01-00-5E-FF-FF-FF ? DoD Internet reserved by IANA

01-00-81-00-00-02 ? Synoptics Network Management

01-80-C2-00-00-00 -802- Spanning tree (for bridges)

01-80-C2-00-00-01 to

01-80-C2-00-00-0F -802- Alternate Spanning multicast

01-80-C2-00-00-14 -802- OSI Route level 1 (within area) IS hello?

01-80-C2-00-00-15 -802- OSI Route level 2 (between area) IS hello?

01-DD-00-FF-FF-FF 7002 Ungermann-Bass boot-me requests

01-DD-01-00-00-00 7005 Ungermann-Bass Spanning Tree

03-00-00-00-00-10 80D5 (OS/2 1.3 EE + Communications Manager)

03-00-00-00-00-40 80D5 (OS/2 1.3 EE + Communications Manager)

09-00-02-04-00-01? 8080? Vitalink printer messages

09-00-02-04-00-02? 8080? Vitalink bridge management

09-00-07-00-00-00 to

09-00-07-00-00-FC -802- AppleTalk Zone multicast addresses

09-00-07-FF-FF-FF -802- AppleTalk broadcast address

09-00-09-00-00-01 8005 HP Probe

09-00-09-00-00-01 -802- HP Probe

09-00-09-00-00-04 8005? HP DTC

09-00-0D-XX-XX-XX -802- ICL Oslan Multicast

09-00-0D-02-00-00 ? ICL Oslan Service discover only on boot

09-00-0D-02-0A-38 ? ICL Oslan Service discover only on boot

09-00-0D-02-0A-39 ? ICL Oslan Service discover only on boot

09-00-0D-02-0A-3C ? ICL Oslan Service discover only on boot

09-00-0D-02-FF-FF ? ICL Oslan Service discover only on boot

09-00-0D-09-00-00 ? ICL Oslan Service discover as required

09-00-1E-00-00-00 8019? Apollo DOMAIN

09-00-26-01-00-01? 8038 Vitalink TransLAN bridge management

09-00-2B-00-00-00 6009? DEC MUMPS?

09-00-2B-00-00-01 8039 DEC DSM/DTP?

09-00-2B-00-00-02 803B? DEC VAXELN?

09-00-2B-00-00-03 8038 DEC Lanbridge Traffic Monitor (LTM)

09-00-2B-00-00-04 ? DEC MAP End System Hello?

09-00-2B-00-00-05 ? DEC MAP Intermediate System Hello?

09-00-2B-00-00-06 803D? DEC CSMA/CD Encryption?

09-00-2B-00-00-07 8040? DEC NetBIOS Emulator?

09-00-2B-00-00-0F 6004 DEC Local Area Transport (LAT)

09-00-2B-00-00-1x ? DEC Experimental

09-00-2B-01-00-00 8038 DEC LanBridge Copy packets (All bridges)

09-00-2B-01-00-01 8038 DEC LanBridge Hello packets (All local

bridges) packet per second, sent by

the designated LanBridge

09-00-2B-02-00-00 ? DEC DNA Level 2 Routing Layer routers?

09-00-2B-02-01-00 803C? DEC DNA Naming Service Advertisement?

09-00-2B-02-01-01 803C? DEC DNA Naming Service Solicitation?

09-00-2B-02-01-02 803E? DEC DNA Time Service

09-00-2B-03-xx-xx ? DEC default filtering by bridges?

09-00-2B-04-00-00 8041? DEC Local Area System Transport (LAST)?

09-00-2B-23-00-00 803A? DEC Argonaut Console?

09-00-39-00-70-00? ? Spider Systems Bridge Hello packet?

09-00-4C-00-00-00 -802- BICC 802.1 management

09-00-4C-00-00-02 -802- BICC 802.1 management

09-00-4C-00-00-06 -802- BICC Local bridge STA 802.1(D) Rev6

09-00-4C-00-00-0C -802- BICC Remote bridge STA 802.1(D) Rev8

09-00-4C-00-00-0F -802- BICC Remote bridge ADAPTIVE ROUTING

(e.g., to Retix)

09-00-4E-00-00-02? 8137? Novell IPX (BICC?)

09-00-56-00-00-00 to

09-00-56-FF-FF-FF ? Stanford reserved

09-00-56-FF-00-00 805C Stanford V Kernel, version 6.0

09-00-77-00-00-00 -802- Retix Bridge Local Management System

09-00-77-00-00-01 -802- Retix spanning tree bridges

09-00-77-00-00-02 -802- Retix Bridge Adaptive routing

09-00-7C-01-00-01 ? Vitalink DLS Multicast

09-00-7C-01-00-03 ? Vitalink DLS Inlink

09-00-7C-01-00-04 ? Vitalink DLS and non DLS Multicast

09-00-7C-02-00-05 8080? Vitalink diagnostics

09-00-7C-05-00-01 8080? Vitalink gateway?

09-00-7C-05-00-02 ? Vitalink Network Validation Message

09-00-87-80-FF-FF 0889 Xyplex Terminal Servers

09-00-87-90-FF-FF 0889 Xyplex Terminal Servers

0D-1E-15-BA-DD-06 ? HP

80-01-43-00-00-00 -802- Bridge

80-01-43-00-00-08 -802- Bridge Management

80-01-43-00-00-28 -802- ISO 10589 level-1 Intermediate Stations

80-01-43-00-00-48 -802- Loadable Device

80-01-43-00-00-88 -802- Load Server

80-01-43-00-00-A8 -802- ISO 10589 level-2 Intermediate Stations

80-01-43-00-80-00 -802- FDDI RMT Directed Beacon

80-01-43-00-80-08 -802- FDDI status report frame

90-00-D4-00-00-20 -802- OSI Network Layer Intermediate Stations

90-00-D4-00-00-A0 -802- OSI Network Layer End Stations

AB-00-00-01-00-00 6001 DEC Maintenance Operation Protocol

(MOP) Dump/Load Assistance

AB-00-00-02-00-00 6002 DEC Maintenance Operation Protocol

(MOP) Remote Console 1 System ID

packet every 8–10 min., by every

DEC LanBridge, DEC DEUNA interface

DEC DELUA interface DEC DEQNA

interface (in a certain mode)

AB-00-00-03-00-00 6003 DECnet Phase IV end node Hello

packets; 1 packet every 15 sec., sent

by each DECnet host

AB-00-00-04-00-00 6003 DECnet Phase IV Router Hello packets;

1 packet every 15 sec. sent by the

DECnet router

AB-00-00-05-00-00 to

AB-00-03-FF-FF-FF ? Reserved DEC

AB-00-03-00-00-00 6004 DEC Local Area Transport (LAT) – old

AB-00-04-00-xx-xx ? Reserved DEC customer private use

AB-00-04-01-xx-yy 6007 DEC Local Area VAX Cluster groups

System Communication Architecture (SCA)

C0-00-00-00-00-01 -802- Active Monitor

C0-00-00-00-00-02 -802- Ring Parameter Monitor

C0-00-00-00-00-04 -802- Network Server Heartbeat

C0-00-00-00-00-08 -802- Ring Error Monitor

C0-00-00-00-00-10 -802- Configuration Report Server

C0-00-00-00-00-20 -802- Synchronous Bandwidth Manager

C0-00-00-00-00-40 -802- Locate — Directory Server

C0-00-00-00-00-80 -802- NetBIOS

C0-00-00-00-01-00 -802- Bridge

C0-00-00-00-02-00 -802- IMPL Server

C0-00-00-00-04-00 -802- Ring Authorization Server

C0-00-00-00-08-00 -802- LAN Gateway

C0-00-00-00-10-00 -802- Ring Wiring Concentrator

C0-00-00-00-20-00 -802- LAN Manager

C0-00-00-00-80-00 to

C0-00-40-00-00-00 -802- user-defined

CF-00-00-00-00-00 9000 Ethernet Configuration Test protocol (Loopback)

FF-FF-00-60-00-04 81D6 LANtastic

FF-FF-00-40-00-01 81D6 LANtastic

FF-FF-01-E0-00-04 81D6 LANtastic

Zuordnung MAC Adresse - Hersteller
MAC Adresse Hersteller

(die ersten 3 Byte)


00-00-02 BBN (internal usage only)

00-00-0C Cisco

00-00-0E FUJITSU LIMITED

00-00-0F NeXT

00-00-10 Sytek

00-00-11 Tektronix

00-00-18 Webster Computer Corp.

00-00-1B Novell Inc.

00-00-1D Cabletron

00-00-20 DIAB (Data Industrier AB)

00-00-21 SC&C

00-00-22 Visual Technology

00-00-23 ABB AUTOMATION AB, DEPT. Q

00-00-29 IMC

00-00-2A TRW

00-00-37 OXFORD METRICS LIMITED

00-00-3C Auspex Systems Inc.

00-00-3D AT&T

00-00-44 Castelle

00-00-46 OLIVETTI NORTH AMERICA

00-00-49 Apricot Computers, Ltd.

00-00-4C NEC CORPORATION

00-00-51 HOB ELECTRONIC GMBH & CO. KG

00-00-52 OPTICAL DATA SYSTEMS (ODS)

00-00-55 AT&T

00-00-5A S & Koch (Xerox unregistered)

00-00-5D RCE

00-00-5E U.S. Department of Defense (IANA)

00-00-61 GATEWAY COMMUNICATIONS

00-00-62 Honeywell

00-00-65 Network General Corporation

00-00-69 Silicon Graphics (?)

00-00-6B MIPS

00-00-6D CRAY COMMUNICATIONS, LTD.

00-00-6E ARTISOFT, INC.

00-00-6F MADGE NETWORKS LTD.

00-00-77 Interphase

00-00-79 NETWORTH INCORPORATED

00-00-7A Ardent

00-00-7B Research Machines

00-00-7D CRAY RESEARCH SUPERSERVERS,INC

00-00-7F LINOTYPE-HELL AG

00-00-80 Imagen (?)

00-00-81 Synoptics

00-00-84 Aquila (?)

00-00-86 Gateway (?)

00-00-89 Cayman Systems Gatorbox

00-00-8A DATAHOUSE INFORMATION SYSTEMS

00-00-8E Solbourne

00-00-93 Proteon

00-00-94 Asante Technologies

00-00-97 Epoch

00-00-98 CrossComm Corporation

00-00-99 MEMOREX TELEX CORPORATION

00-00-9F Ameristar Technology

00-00-A0 Sanyo Electronics

00-00-A2 Wellfleet

00-00-A3 Network Application Technology

00-00-A4 Acorn Computers Limited

00-00-A5 COMPATIBLE SYSTEMS CORP.

00-00-A6 Network General (internal assignment, not for products)

00-00-A7 Network Computing Devices (NCD) X-terminals

00-00-A8 Stratus Computer, Inc

00-00-A9 Network Systems Corp.

00-00-AA Xerox machines

00-00-AC Apollo

00-00-AE DASSAULT AUTOMATISMES ET

00-00-B0 RND (RAD Network Devices)

00-00-B1 ALPHA MICROSYSTEMS INC.

00-00-B3 CIMLinc

00-00-B5 Datability

00-00-B6 MICRO-MATIC RESEARCH

00-00-B7 Dove Computer Corporation

00-00-BC Allen-Bradley Co. Inc.

00-00-C0 Western Digital

00-00-C1 OLICOM A/S

00-00-C6 HP Intelligent Networks Operation (formerly Eon Systems)

00-00-C8 Altos

00-00-C9 Emulex Terminal Servers

00-00-CC DENSAN CO., LTD.

00-00-CD INDUSTRIAL RESEARCH LIMITED

00-00-D0 Develcon Electronics, Ltd.

00-00-D1 Adaptec Inc. "Nodem" product

00-00-D7 Dartmouth College (NED Router)

00-00-D8 Novell

00-00-DD Gould

00-00-DE Unigraph

00-00-E2 Acer Counterpoint

00-00-E3 INTEGRATED MICRO PRODUCTS LTD

00-00-E6 APTOR PRODUITS DE COMM INDUST

00-00-E8 Accton Technology Corporation

00-00-E9 ISICAD, INC.

00-00-ED APRIL

00-00-EE Network Designers Limited (?)

00-00-EF Alantec

00-00-F0 Samsung

00-00-F3 Gandalf

00-00-F8 Digital Equipment Corporation

00-00-FD High Level Hardware (Orion, UK)

00-01-02 BBN internal usage (not registered)

00-01-43 IEEE 802

00-01-68 W&G (Wandel & Goltermann)

00-01-C8 Thomas Conrad Corp

00-17-00 Kabel

00-20-06 GARRETT COMMUNICATIONS, INC.

00-20-08 CABLE & COMPUTER TECHNOLOGY

00-20-09 PACKARD BELL ELEC., INC.

00-20-0C ADASTRA SYSTEMS CORP.

00-20-11 CANOPUS CO., LTD.

00-20-14 GLOBAL VIEW CO., LTD.

00-20-15 ACTIS COMPUTER SA

00-20-17 ORBOTECH

00-20-1C EXCEL, INC.

00-20-1E NETQUEST CORPORATION

00-20-1F BEST POWER TECHNOLOGY, INC.

00-20-21 ALGORITHMS SOFTWARE PVT. LTD.

00-20-24 PACIFIC COMMUNICATION SCIENCES

00-20-25 CONTROL TECHNOLOGY, INC.

00-20-27 MING FORTUNE INDUSTRY CO., LTD

00-20-2E DAYSTAR DIGITAL

00-20-30 ANALOG & DIGITAL SYSTEMS

00-20-32 ALCATEL TAISEL

00-20-36 BMC SOFTWARE

00-20-3A DIGITAL BI0METRICS INC.

00-20-3C EUROTIME AB

00-20-3F JUKI CORPORATION

00-20-42 DATAMETRICS CORP.

00-20-44 GENITECH PTY LTD

00-20-48 FORE SYSTEMS, INC.

00-20-49 COMTRON, INC.

00-20-4A PRONET GMBH

00-20-4B AUTOCOMPUTER CO., LTD.

00-20-4C MITRON COMPUTER PTE LTD.

00-20-4D INOVIS GMBH

00-20-4E NETWORK SECURITY SYSTEMS, INC.

00-20-4F DEUTSCHE AEROSPACE AG

00-20-50 KOREA COMPUTER INC.

00-20-51 PHOENIX DATA COMMUNUNICATIONS

00-20-53 HUNTSVILLE MICROSYSTEMS, INC.

00-20-56 NEOPRODUCTS

00-20-5D NANOMATIC OY

00-20-5F GAMMADATA COMPUTER GMBH

00-20-61 DYNATECH COMMUNICATIONS, INC.

00-20-64 PROTEC MICROSYSTEMS, INC.

00-20-66 GENERAL MAGIC, INC.

00-02-67 NODE RUNNER, INC.

00-20-68 ISDYNE

00-20-69 ISDN SYSTEMS CORPORATION

00-20-6A OSAKA COMPUTER CORP.

00-20-6D DATA RACE, INC.

00-20-77 KARDIOS SYSTEMS CORP.

00-20-7F KYOEI SANGYO CO., LTD.

00-20-82 ONEAC CORPORATION

00-20-83 PRESTICOM INCORPORATED

00-20-84 OCE GRAPHICS USA, INC.

00-20-88 GLOBAL VILLAGE COMMUNICATION

00-20-8B LAPIS TECHNOLOGIES, INC.

00-20-8C GALAXY NETWORKS, INC.

00-20-8E CHEVIN SOFTWARE ENG. LTD.

00-20-99 BON ELECTRIC CO., LTD.

00-20-9B ERSAT ELECTRONIC GMBH

00-20-9C PRIMARY ACCESS CORP.

00-20-9D LIPPERT AUTOMATIONSTECHNIK

00-20-A1 DOVATRON

00-20-A4 MULTIPOINT NETWORKS

00-20-A6 PROXIM, INC.

00-20-AA NTL

00-20-AC INTERFLEX DATENSYSTEME GMBH

00-20-AE ORNET DATA COMMUNICATION TECH.

00-20-AF 3COM CORPORATION

00-20-B0 GATEWAY DEVICES, INC.

00-20-B1 COMTECH RESEARCH INC.

00-20-B6 AGILE NETWORKS, INC.

00-20-BA CENTER FOR HIGH PERFORMANCE

00-20-BE LAN ACCESS CORP.

00-20-BF AEHR TEST SYSTEMS

00-20-C5 EAGLE TECHNOLOGY

00-20-C6 NECTEC

00-20-C8 LARSCOM INCORPORATED

00-20-CA DIGITAL OCEAN

00-20-CC DIGITAL SERVICES, LTD.

00-20-CD HYBRID NETWORKS, INC.

00-20-CE LOGICAL DESIGN GROUP, INC.

00-20-D1 MICROCOMPUTER SYSTEMS (M) SDN.

00-20-D3 OST (OUEST STANDARD TELEMATIQU

00-20-D6 LANNAIR LTD.

00-20-DC DENSITRON TAIWAN LTD.

00-20-E1 ALAMAR ELECTRONICS

00-20-E7 B&W NUCLEAR SERVICE COMPANY

00-20-E8 DATATREK CORPORATION

00-20-E9 DANTEL

00-20-EA EFFICIENT NETWORKS, INC.

00-20-ED GIGA-BYTE TECHNOLOGY CO., LTD.

00-20-EE GTECH CORPORATION

00-20-F1 ALTOS INDIA LIMITED

00-20-F5 PAN DACOM TELECOM'CATIONS GMBH

00-20-F6 NET TEK AND KARLNET, INC.

00-20-F8 CARRERA COMPUTERS, INC.

00-40-0C GENERAL MICRO SYSTEMS, INC.

00-40-0D LANNET DATA COMMUNICATIONS,LTD

00-40-13 NTT DATA COMM. SYSTEMS CORP.

00-40-14 COMSOFT GMBH

00-40-15 ASCOM INFRASYS AG

00-40-1F COLORGRAPH LTD

00-40-20 PINACL COMMUNICATION

00-40-23 LOGIC CORPORATION

00-40-25 MOLECULAR DYNAMICS

00-40-26 MELCO, INC.

00-40-2A CANOGA-PERKINS

00-40-30 GK COMPUTER

00-40-32 DIGITAL COMMUNICATIONS

00-40-33 ADDTRON TECHNOLOGY CO., LTD.

00-40-39 OPTEC DAIICHI DENKO CO., LTD.

00-40-3C FORKS, INC.

00-40-41 FUJIKURA LTD.

00-40-43 NOKIA DATA COMMUNICATIONS

00-40-4C HYPERTEC PTY LTD.

00-40-50 IRONICS, INCORPORATED

00-40-57 LOCKHEED - SANDERS

00-40-5B FUNASSET LIMITED

00-40-6A KENTEK INFORMATION SYSTEMS,INC

00-40-66 HITACHI CABLE, LTD.

00-40-67 OMNIBYTE CORPORATION

00-40-68 EXTENDED SYSTEMS

00-40-69 LEMCOM SYSTEMS, INC.

00-40-6E COROLLARY, INC.

00-40-74 CABLE AND WIRELESS

00-40-76 AMP INCORPORATED

00-40-7F AGEMA INFRARED SYSTEMS AB

00-40-82 LABORATORY EQUIPMENT CORP.

00-40-86 MICHELS & KLEBERHOFF COMPUTER

00-40-8C AXIS COMMUNICATIONS AB

00-40-8E CXR/DIGILOG

00-40-91 PROCOMP INDUSTRIA ELETRONICA

00-40-92 ASP COMPUTER PRODUCTS, INC.

00-40-9A NETWORK EXPRESS, INC.

00-40-9D DIGIBOARD, INC.

00-40-9E CONCURRENT TECHNOLOGIES LTD.

00-40-9F LANCAST/CASAT TECHNOLOGY, INC.

00-40-A6 CRAY RESEARCH INC.

00-40-AE DELTA CONTROLS, INC.

00-40-AF DPI

00-40-B4 3COM K.K.

00-40-B6 COMPUTERM CORPORATION

00-40-B9 MACQ ELECTRONIQUE SA

00-40-C1 BIZERBA-WERKE WILHEIM KRAUT

00-40-C2 APPLIED COMPUTING DEVICES

00-40-C3 FISCHER AND PORTER CO.

00-40-C6 FIBERNET RESEARCH, INC.

00-40-C8 Milan Technology Corporation

00-40-D2 PAGINE CORPORATION

00-40-D4 GAGE TALKER CORP.

00-40-D8 OCEAN OFFICE AUTOMATION LTD.

00-40-DF DIGALOG SYSTEMS, INC.

00-40-E1 MARNER INTERNATIONAL, INC.

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