Cabletron Systems MCC-16 User manual

MCC-16

TOKEN RING

MEDIA CONVERSION CENTER

USER’S GUIDE

i

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.



Printed in the United States of America

Order Number: 9032097-02 July 1997

Cabletron

,

SPECTRUM

and

LANVIEW

are registered trademarks of Cabletron Systems, Inc.

MIM

, and

MMAC

are trademarks of Cabletron Systems, Inc.

All product names mentioned in this manual may be trademarks or registered trademarks of their

respective companies.

FCC NOTICE

This device complies with Part 15 of the 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.

NOTE

:

This equipment has been tested and found to comply with the limits for a Class A digital

device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable

protection against harmful interference when the equipment is operated in a commercial environment.

This equipment uses, generates, and can radiate radio frequency energy and if not installed in

accordance with the operator’s manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause interference in which case the user

will be required to correct the interference at his own expense.

WARNING

:

Changes or modifications made to this device which are not expressly approved by the

party responsible for compliance could void the user’s authority to operate the equipment.

Printed on Recycled Paper

NOTICE

ii

DOC NOTICE

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital

apparatus set out in the Radio Interference Regulations of the Canadian Department of

Communications.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables

aux appareils numériques de la class A prescrites dans le Règlement sur le brouillage radioélectrique

édicté par le ministère des Communications du Canada.

VCCI NOTICE

This is a Class A product based on the standard of the Voluntary Control Council for Interference by

Information Technology Equipment (VCCI). If this equipment is used in a domestic environment,

radio disturbance may arise. When such trouble occurs, the user may be required to take corrective

actions.

CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT

IMPORTANT

:

Before utilizing this product, carefully read this License Agreement.

This document is an agreement between you, the end user, and Cabletron Systems, Inc. (“Cabletron”)

that sets forth your rights and obligations with respect to the Cabletron software program (the

“Program”) contained in this package. The Program may be contained in ﬁrmware, chips or other

media. BY UTILIZING THE ENCLOSED PRODUCT, YOU ARE AGREEING TO BECOME

BOUND BY THE TERMS OF THIS AGREEMENT, WHICH INCLUDES THE LICENSE AND

THE LIMITATION OF WARRANTY AND DISCLAIMER OF LIABILITY. IF YOU DO NOT

AGREE TO THE TERMS OF THIS AGREEMENT, PROMPTLY RETURN THE UNUSED

PRODUCT TO THE PLACE OF PURCHASE FOR A FULL REFUND.

NOTICE

iii

CABLETRON SOFTWARE PROGRAM LICENSE

1. LICENSE

. You have the right to use only the one (1) copy of the Program provided in this

package subject to the terms and conditions of this License Agreement.

You may not copy, reproduce or transmit any part of the Program except as permitted by the

Copyright Act of the United States or as authorized in writing by Cabletron.

2. OTHER RESTRICTIONS. You may not reverse engineer, decompile, or disassemble the

Program.

3. APPLICABLE LAW. This License Agreement shall be interpreted and governed under the laws

and in the state and federal courts of New Hampshire. You accept the personal jurisdiction and

venue of the New Hampshire courts.

EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY

1. EXCLUSION OF

WARRANTY. Except as may be specifically provided by Cabletron in

writing, Cabletron makes no warranty, expressed or implied, concerning the Program (including

its documentation and media).

CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO

YOU BY CABLETRON IN WRITING, EITHER EXPRESSED OR IMPLIED, INCLUDING

BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND

FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO THE PROGRAM, THE

ACCOMPANYING WRITTEN MATERIALS, AND ANY ACCOMPANYING HARDWARE.

2. NO LIABILITY FOR CONSEQUENTIAL DAMAGES. IN NO EVENT SHALL

CABLETRON OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER

(INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS,

PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, SPECIAL,

INCIDENTAL, CONSEQUENTIAL, OR RELIANCE DAMAGES, OR OTHER LOSS)

ARISING OUT OF THE USE OR INABILITY TO USE THIS CABLETRON PRODUCT,

EVEN IF CABLETRON HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH

DAMAGES. BECAUSE SOME STATES DO NOT ALLOW THE EXCLUSION OR

LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES, OR

ON THE DURATION OR LIMITATION OF IMPLIED WARRANTIES, IN SOME

INSTANCES THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO

YOU.

UNITED STATES GOVERNMENT RESTRICTED RIGHTS

The enclosed product (a) was developed solely at private expense; (b) contains “restricted computer

software” submitted with restricted rights in accordance with Section 52227-19 (a) through (d) of the

Commercial Computer Software - Restricted Rights Clause and its successors, and (c) in all respects

is proprietary data belonging to Cabletron and/or its suppliers.

For Department of Defense units, the product is licensed with “Restricted Rights” as deﬁned in the

DoD Supplement to the Federal Acquisition Regulations, Section 52.227-7013 (c) (1) (ii) and its

successors, and use, duplication, disclosure by the Government is subject to restrictions as set forth in

subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at 252.227-

7013. Cabletron Systems, Inc., 35 Industrial Way, Rochester, New Hampshire 03867-0505.

NOTICE

iv

DECLARATION OF CONFORMITY

Application of Council Directive(s):

89/336/EEC

73/23/EEC

Manufacturer’s Name:

Cabletron Systems, Inc.

Manufacturer’s Address:

35 Industrial Way

PO Box 5005

Rochester, NH 03867

European Representative Name:

Mr. J. Solari

European Representative Address:

Cabletron Systems Limited

Nexus House, Newbury Business Park

London Road, Newbury

Berkshire RG13 2PZ, England

Conformance to Directive(s)/Product Standards:

EC Directive 89/336/EEC

EC Directive 73/23/EEC

EN 55022

EN 50082-1

EN 60950

Equipment Type/Environment:

Networking Equipment, for use in a

Commercial or Light

Industrial

Environment.

We the undersigned, hereby declare, under our sole responsibility, that the equipment packaged

with this notice conforms to the above directives.

Manufacturer Legal Representative in Europe

Mr. Ronald Fotino Mr. J. Solari

___________________________________ ___________________________________

Full Name Full Name

Principal Compliance Engineer Managing Director - E.M.E.A.

___________________________________ ___________________________________

Title Title

Rochester, NH, USA Newbury, Berkshire, England

___________________________________ ___________________________________

Location Location

v

CONTENTS

PREFACE

CHAPTER 1 INTRODUCTION

1.1 MCC-16 Functional Overview......................................................1-2

1.1.1 Speed-Fault Protection...................................................1-3

1.1.2 Active Re-timing With Jitter Reduction Circuitry .............1-3

1.2 Conversion Modules....................................................................1-4

1.2.1 MCC-FRIO......................................................................1-4

1.2.2 MCC-DFL........................................................................1-4

1.2.3 MCC-CRIO .....................................................................1-5

1.2.4 MCC-D2PM ....................................................................1-5

CHAPTER 2 INSTALLATION

2.1 Installation Considerations ..........................................................2-1

2.2 Unpacking And Handling The MCC-16 .......................................2-2

2.3 Mounting The MCC-16 In A 19-Inch Rack...................................2-3

2.4 Unpacking And Installing The MCC-PS.......................................2-4

2.4.1 Power Supply LEDs........................................................2-5

2.4.2 Turning The MCC-16 On And Off...................................2-6

2.5 Unpacking A CM..........................................................................2-6

2.6 Installing A CM ............................................................................2-7

2.6.1 Boot-Up Sequence Of LEDs...........................................2-9

2.7 Resetting A CM ...........................................................................2-9

2.8 Attaching Cabling ........................................................................2-9

2.8.1 Connecting Twisted Pair Cabling..................................2-10

2.8.2 Connecting Fiber Optic Cabling....................................2-10

2.9 Determining The Station Count.................................................2-11

2.10 Troubleshooting The Network ...................................................2-12

2.10.1 Checking The MCC-16 .................................................2-12

2.10.2 Checking Lobe And Station Ports.................................2-12

2.10.3 Individual Station Problems ..........................................2-13

2.10.4 Checking RI/RO Ports ..................................................2-14

2.10.5 Checking The Entire Network.......................................2-15

CONTENTS

vi

CHAPTER 3 MCC-FRIO SETUP

3.1 Overview Of The MCC-FRIO.......................................................3-2

3.1.1 Token Flow......................................................................3-2

3.2 Setting Switches And Jumpers ....................................................3-3

3.2.1 Selecting The Ring Speed...............................................3-4

3.2.2 Selecting The Fiber Keying Type....................................3-4

3.3 LED Functions .............................................................................3-5

3.3.1 PWR - Power...................................................................3-5

3.3.2 16 Mb - Ring Speed ........................................................3-5

3.3.3 P1 And P2 - Ports............................................................3-6

3.3.4 RI And RO - Ports ...........................................................3-6

CHAPTER 4 MCC-DFL SETUP

4.1 Overview Of The MCC-DFL.........................................................4-2

4.2 Configuring The MCC-DFL ..........................................................4-3

4.2.1 Configuring The RJ45 Port As A Lobe

And The Fiber ST Port As A Station................................4-4

4.2.2 Configuring The RJ45 Port As A Station

And The Fiber ST Port As A Lobe...................................4-5

4.2.3 Configuring The RJ45 Port As RI

And The Fiber ST Port As RO.........................................4-6

4.2.4 Configuring The RJ45 Port As RO

And The Fiber ST Port As RI...........................................4-7

4.3 Selecting The Ring Speeds .........................................................4-8

4.4 Description Of Switches...............................................................4-9

4.4.1 Switch 1...........................................................................4-9

4.4.2 Switch 2...........................................................................4-9

4.4.3 Switch 3.........................................................................4-10

4.4.4 Switch 4.........................................................................4-10

4.5 LED Functions ...........................................................................4-11

4.5.1 PWR - Power.................................................................4-11

4.5.2 16 Mb - Ring Speed ......................................................4-11

4.5.3 P1 And P2 - Ports..........................................................4-12

CONTENTS

vii

CHAPTER 5 MCC-CRIO SETUP

5.1 Overview Of The MCC-CRIO......................................................5-2

5.1.1 Token Flow .....................................................................5-2

5.2 Setting Switches And Jumpers....................................................5-3

5.2.1 Selecting The Ring Speed..............................................5-4

5.2.2 Setting Port Configurations.............................................5-4

5.3 LED Functions.............................................................................5-6

5.3.1 PWR - Power..................................................................5-6

5.3.2 16 Mb - Ring Speed........................................................5-6

5.3.3 P1 And P2 - Ports...........................................................5-7

5.3.4 RI And RO - Ports...........................................................5-7

CHAPTER 6 MCC-D2PM SETUP

6.1 Overview Of The MCC-D2PM.....................................................6-2

6.1.1 Token Flow .....................................................................6-3

6.2 Setting Jumpers To Configure The CM.......................................6-3

6.2.1 Joining The D2PM Into One Ring...................................6-3

6.2.2 Selecting The Ring Speed(s)..........................................6-4

6.2.3 Summary Of Jumper Settings.........................................6-5

6.3 LED Functions.............................................................................6-5

6.3.1 PWR- Power...................................................................6-6

6.3.2 2 Rings - CM Split...........................................................6-6

6.3.3 16 Mb - Ring Speed(s)....................................................6-6

6.3.4 P1, P2, P3, And P4 - Ports .............................................6-6

APPENDIX A SPECIFICATIONS

A.1 Environmental Requirements......................................................A-1

A.2 Hardware Specifications..............................................................A-1

A.3 MCC-PS Power Supply Specifications........................................A-2

A.4 Regulatory Compliance...............................................................A-2

CONTENTS

viii

APPENDIX B CABLING

B.1 Trunk Cabling.............................................................................. B-1

B.2 Lobe Cabling............................................................................... B-2

B.2.1 Lobe Port........................................................................ B-2

B.2.2 Station Port.....................................................................B-2

B.3 Requirements And Recommendations .......................................B-2

B.3.1 Network Performance Requirements.............................. B-3

B.3.2 Signal Interference.......................................................... B-3

B.3.3 Determining The Maximum Signal-Drive Distance.........B-4

B.4 Cable Pinouts.............................................................................. B-4

B.4.1 Station Port Pins.............................................................B-4

B.4.2 Lobe Port Pins................................................................ B-5

B.4.3 RI Port Pins..................................................................... B-6

B.4.4 RO Port Pins................................................................... B-6

B.5 Connecting To An IBM Patch Panel ...........................................B-7

APPENDIX C MEDIA SPECIFICATIONS

C.1 Twisted Pair Copper Cable.........................................................C-1

C.1.1 UTP.................................................................................C-1

C.1.2 STP.................................................................................C-2

C.2 Fiber Optic Cable Specifications.................................................C-3

C.2.1 Multimode.......................................................................C-3

C.2.2 Single-Mode....................................................................C-3

INDEX

ix

PREFACE

Welcome to the

Token Ring Media Conversion Center (MCC-16)

User’s Guide

. This manual describes the capabilities and features,

operating speciﬁcations, installation, and troubleshooting procedures of

Cabletron Systems MCC-16 Media Conversion Center.

DOCUMENT CONVENTIONS

The following conventions are used throughout this document:

Bold Italics

are used to

reference Cabletron Systems documents and other

publications.

NOTE

Note

calls your attention to information of special importance.

TIP

Tip

gives you a helpful hint concerning procedures or actions.

!

CAUTION

Caution

calls your attention to information essential to avoid

damage to the equipment, or network conﬁguration settings.

Warning

calls your attention to an action that could result in

the presence of an electrical shock hazard.

PREFACE

x

USING THIS MANUAL

Prior to installing and operating the MCC-16, read this manual

completely to become familiar with its contents and the features of the

MCC-16. This manual assumes the reader has a general working

knowledge of Token Ring (IEEE 802.5) networks.

The manual is organized as follows:

Chapter 1,

Introduction

, provides an overview of the features and

capabilities of the MCC-16 and CMs, and describes the power supplies.

Chapter 2,

Installation

, describes the installation of the MCC-16 chassis

into a 19-inch rack, an MCC-PS power supply into the MCC-16, a CM

into the MCC-16, and cabling into CM ports. The chapter also details the

maximum cable lengths, the maximum station count, and troubleshooting

procedures that can isolate problems.

Chapter 3,

MCC-FRIO Setup

, describes how to conﬁgure the

MCC-FRIO CM and explains its LEDs.

Chapter 4,

MCC-DFL Setup

, describes how to conﬁgure the MCC-DFL

CM and explains its LEDs.

Chapter 5,

MCC-CRIO Setup

, describes how to conﬁgure the

MCC-CRIO CM and explains its LEDs.

Chapter 6,

MCC-D2PM Setup

, describes how to conﬁgure the

MCC-D2PM

CM and explains its LEDs.

Appendix A,

Speciﬁcations

, describes the speciﬁcations of the MCC-16,

the CMs, and the MCC-PS power supply.

Appendix B,

Cabling

, details cabling speciﬁcations, provides

recommendations to optimize network performance, deﬁnes signal

assignments for port pins, and illustrates pinouts to connect to an IBM

patch panel using MIC.

Appendix C,

Media Speciﬁcations

, discusses the design and

performance speciﬁcations for different media types used in Token Ring

networks.

PREFACE

xi

RECOMMENDED READING

The following publications are recommended if more information is

required regarding the implementation of Token Ring networks.

Local Area Networks

,

Token Ring Access Method

, IEEE Standard 802.5

(1989)

Commercial Building Telecommunication Cabling

,

No. EIA/TIA-568

TECHNICAL SUPPORT

If you need additional support related to this device, or if you have any

questions, comments, or suggestions concerning this manual, contact the

Cabletron Systems Global Call Center:

Before calling the Cabletron Systems Global Call Center, have the

following information ready:

•

Your Cabletron Systems service contract number

•

A description of the failure

•

A description of any action(s) already taken to resolve the problem

(e.g., changing mode switches, rebooting the unit, etc.)

•

The serial and revision numbers of all involved Cabletron Systems

products in the network

•

A description of your network environment (layout, cable type, etc.)

•

Network load and frame size at the time of trouble (if known)

Phone (603) 332-9400

Internet mail suppor[email protected]

FTP ctron.com (134.141.197.25)

Login

anonymous

Password

your email address

BBS (603) 335-3358

Modem setting 8N1: 8 data bits, No parity, 1 stop bit

For additional information about Cabletron Systems or our products,

visit our World Wide Web site:

http://www.cabletron.com/

For technical support, select

Service and Support

.

PREFACE

xii

•

The device history (i.e., have you returned the device before, is this a

recurring problem, etc.)

•

Any previous Return Material Authorization (RMA) numbers

1-1

CHAPTER 1

INTRODUCTION

The MCC-16 Media Conversion Center is a 16-slot modular chassis that

holds up to 16 Conversion Modules (CMs). The MCC-16, shown in

Figure 1-1, can change twisted pair switch ports to different ports and/or

media types. It is designed for switches and can convert between Ring In

(RI), Ring Out (RO), lobe, and station ports, using twisted pair or

multimode ﬁber optic cabling.

The MCC-16 accommodates four different CMs. Each CM can support at

least two lobe ports which allow the connection of station ports,

commonly on switches. The MCC-16 is IEEE 802.5 and IBM compliant.

The conversion modules are discussed in Section 1.1 and Section 1.2.

Figure 1-1 The MCC-16 Media Conversion Center

MCC-16

MCC-DFLMCC-DFLMCC-DFLMCC-DFL

MCC-FRIOMCC-FRIOMCC-FRIOMCC-FRIOMCC-D2PM MCC-CRIO MCC-CRIO MCC-CRIO MCC-CRIOMCC-D2PM MCC-D2PM MCC-D2PM

INTRODUCTION

1-2

1.1 MCC-16 FUNCTIONAL OVERVIEW

The MCC-16 Media Conversion Center holds up to 16 CMs. The CMs

(listed in Table 1-1) can be used in any combination to accommodate

various types of Token Ring connections.

The MCC-16 features:

•

Compatibility with all Token Ring IEEE 802.5 compliant devices.

•

Ability to operate at 16 Mbps or 4 Mbps ring speeds.

•

Auto-sensing RJ45 ports that accept both Shielded Twisted Pair (STP)

and Unshielded Twisted Pair (UTP) cabling.

•

Active Re-timing with Jitter Reduction Circuitry that effectively

reduces jitter.

Table 1-1 Port And Media Type Of Conversion Modules

Type of Ports on the CM

Conversion

Module (CM)

Twisted Pair

(RJ45 Ports)

Multimode Fiber

(ST Ports)

See

Chapter

Below

For More

Information

MCC-FRIO

(Fiber

Ring In/Out)

Two lobe ports

One set RI/RO

ports

Chapter 4

MCC-DFL

(Dual Fiber

Link)

Two conﬁgurable

ports (station,

lobe, RI, or RO)

Two conﬁgurable

ports (station,

lobe, RI, or RO)

Chapter 5

MCC-CRIO

(Copper

Ring In/Out)

Two lobe ports

One set RI/RO

ports

Not applicable Chapter 6

MCC-D2PM

(Dual 2-Port

MAU)

Four lobe ports Not applicable Chapter 7

INTRODUCTION

1-3

•

Speed-fault protection that prevents stations from causing a beaconing

condition when entering the ring at the wrong speed.

•

Dual load-sharing, fully redundant power supplies.

•

CMs and power supplies that can be installed or removed without

interrupting the operation of the other CMs and power supply in

the MCC-16.

•

Support for any combination of interchangeable CMs to provide

ﬂexibility in choosing media types accommodating a wide variety of

topologies.

•

Integrated rack-mount brackets that allow the MCC-16 to install into

any 19-inch rack.

•

Autowrap feature on RI/RO ports that disables the appropriate port if

the cable is disconnected or fails – preserving ring integrity.

•

LANVIEW LED system that reports the status of the physical layer.

1.1.1 Speed-Fault Protection

The CMs prevent any device from entering the ring at the wrong speed by

wrapping (closing) the port to which the device is trying to insert. This

prevents the device from beaconing the ring.

1.1.2 Active Re-timing With Jitter Reduction Circuitry

Active Re-timing with Jitter Reduction Circuitry uses a dual-digital,

Phase Lock Loop (PLL) that utilizes First-In, First-Out (FIFO) processing

to track and accurately receive even poor quality signals. This circuitry

effectively reduces jitter on a ring and removes jitter budget restraints.

This permits the use of longer cable lengths and mixed media types

without penalty and supports 250 stations per ring.

INTRODUCTION

1-4

1.2 CONVERSION MODULES

Each CM has at least two RJ45 receptacles that can be used for attaching

the cable from a Token Ring station, such as a switch. CMs that have

RI/RO capability allow the connection of RI ports to RO ports

(and vice versa) on other devices to extend the ring. The RI/RO ports are

compatible with all 802.5 compliant devices including passive MAUs.

By using different CMs in the MCC-16, the installation can contain RI,

RO, lobe, and station ports of either multimode ﬁber or twisted pair cable

to meet the needs of almost any topology.

1.2.1 MCC-FRIO

The MCC-FRIO, with RI/RO capabilities, has a set of ﬁber

ST RI/RO ports that can connect to RI/RO ports on other devices

(e.g., TDRMIM-AT, TRFOT-2, or TRRMIM-4AT) to extend the ring. The

module also has two lobe ports to connect stations. Thus, stations

connected to either lobe port can communicate across the RI/RO

connections to other parts of the ring, and they will also communicate

with each other.

1.2.2 MCC-DFL

The MCC-DFL has two Fiber Optic Transceivers (FOTs). Each FOT has a

twisted pair and ﬁber ST port. This allows signals transmitted over the

twisted pair to be converted into optical signals for transmission over

multimode ﬁber. You can conﬁgure each FOT as a RI/RO device or a

station/lobe device. A switch can be set so that connections can be made

to an 802.5J compliant device.

NOTE

The MCC-16 backplane supplies the power for the CMs. Each

CM provides media conversion and/or port-type switching per

module.

NOTE

Cabletron Systems offers complete compatibility with vendor

products that comply with the “new” 802.5J standard for ﬁber

RI/RO ports. Therefore, the MCC-16 offers connectivity to

products using 802.5J or Cabletron Systems ﬁber keying.

INTRODUCTION

1-5

1.2.3 MCC-CRIO

The MCC-CRIO has a set of twisted pair RI/RO ports that can connect to

other devices with RI/RO capability (e.g., TDRMIM-AT). It also has two

lobe ports. This allows for RI/RO connections and the connection of

two stations. It provides the same functionality as the MCC-FRIO

(see Section 1.2.1) except it has twisted pair RI/RO ports.

1.2.4 MCC-D2PM

The MCC-D2PM can serve as a pair of two-port Multi-Station Access

Units (MAUs) or a single four-port twisted pair MAU.

INTRODUCTION

1-6

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Cabletron Systems MCC-16 User manual

Cabletron Systems MCC-16 User manual

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