Cabletron Systems FDMMIM-24 Installation and User Manual

The Complete Networking Solution

FDMMIM, FDMMIM-04,

FDMMIM-24, and FDMMIM-30

FDDI CONCENTRATOR

ETHERNET to FDDI

BRIDGE MODULES

INSTALLATION and

USER’S GUIDE

Cabletron Systems, P. O. Box 5005, Rochester, NH 03867-0505

NOTICE

i

NOTICE

Cabletron Systems reserves the right to make changes in

specifications, hardware, firmware, software, 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.

IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY

INCIDENTAL, INDIRECT, SPECIAL, OR CONSEQUENTIAL

DAMAGES WHATSOEVER (INCLUDING BUT NOT LIMITED TO

LOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL

OR THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON

SYSTEMS HAS BEEN ADVISED OF, KNOWN, OR SHOULD HAVE

KNOWN, THE POSSIBILITY OF SUCH DAMAGES.

 Copyright July 1994

Cabletron Systems, Inc

P.O. Box 5005

Rochester, NH 03867-0505

Printed in the United States of America

Part number: 9030670-03 July 1994

Multi Media Access Center, SPECTRUM, Remote LANVIEW,

and LANVIEW are registered trademarks and FDMMIM,

FDMMIM-04, FDMMIM-24, FDMMIM-30, FDCMIM-04,

FDCMIM-08, FDCMIM-24, FDCMIM-28, IRM, IRM-2, IRM-3,

IRBM, EMME, TRMM, CXRMIM, TPRMIM, FORMIM, Flexible

Network Bus, MMAC-3FNB, MMAC-5FNB, MMAC-8FNB, and

MMAC-M8FNB are trademarks of Cabletron Systems, Inc.

CompuServe is a registered trademark of CompuServe.

Ethernet is a trademark of Xerox, Inc.

IBM is a registered trademark of International Business Machines Corp.

UNIX is a registered trademark of Unix System Laboratories, Inc.

VT-220 and VT-320 are trademarks of Digital Equipment Corp.

Windows is a registered trademark of Microsoft Corp.

FCC NOTICE

ii

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.

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.

Printed on recycled paper

NOTICE

iii

SAFETY INFORMATION

CLASS 1 LASER TRANSCEIVERS

CLASS 1

LASER PRODUCT

Class 1 Laser Products

The FDMMIM-30 connectors use Class 1 Laser transceivers. Read

the following safety information before installing or operating the

FDMMIM-30.

The Class 1 laser transceivers use an optical feedback loop to

maintain Class 1 operation limits. This control loop eliminates the

need for maintenance checks or adjustments. The output is factory

set, and does not allow any user adjustment. Class 1 Laser

transceivers comply with the following safety standards:

• 21 CFR 1040.10 and 1040.11 U.S. Department of Health and

Human Services (FDA).

• IEC Publication 825 (International Electrotechnical

Commission).

• CENELEC EN 60825 (European Committee for

Electrotechnical Standardization).

When operating within their performance limitations, laser

transceiver output meets the Class 1 accessible emission limit of all

three standards. Class 1 levels of laser radiation are not considered

hazardous.

FCC NOTICE

iv

SAFETY INFORMATION

CLASS 1 LASER TRANSCEIVERS

Laser Radiation and Connectors

When the connector is in place, all laser radiation remains within

the fiber. The maximum amount of radiant power exiting the fiber

(under normal conditions) is -12.6dBm or 55x10 -6 watts.

Removing the optical connector from the transceiver allows laser

radiation to emit directly from the optical port. The maximum

radiance from the optical port (under worst case conditions) is 0.8 W

cm-2 or 8x10 3 W m-2 sr-1.

Do not use optical instruments to view the laser output. The use of

optical instruments to view laser output increases eye hazard. When

viewing the output optical port, you must remove power from the

network adapter.

v

CONTENTS

CHAPTER 1 INTRODUCTION

1.1 Using this Manual ........................................................................1-2

1.2 Getting Help ..................................................................................1-4

1.3 The FDMMIM FDDI Concentrator and Ethernet to FDDI

Bridging Modules ..........................................................................1-4

1.4 FDMMIM Features .......................................................................1-7

CHAPTER 2 INSTALLING THE FDMMIM

2.1 Before you Install the FDMMIM . . .............................................2-1

2.1.1 Adding MIMs to an MMAC.................................................2-2

2.1.2 MMAC Configurations ........................................................2-4

2.1.3 IRM-3 and Ethernet MIMs with FDMMIMs .....................2-4

2.1.4 EMME and RMIMs with an FDMMIM..............................2-5

2.2 Installing the FDMMIM ...............................................................2-6

2.2.1 Setting Jumpers ..................................................................2-6

2.2.2 Setting Configuration Switches..........................................2-7

2.2.3 Installing into the MMAC...................................................2-9

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

2.4 FDMMIM-04 and FDMMIM-24 Master Port

Cable Connections.......................................................................2-13

2.5 Twisted Pair Pinout Configuration ............................................2-13

2.6 Master Ports and LANVIEW......................................................2-14

2.7 FDMMIM and LANVIEW ..........................................................2-15

2.7.1 Ethernet LEDs...................................................................2-15

2.7.2 FDDI LEDs ........................................................................2-17

CHAPTER 3 CONNECTING TO LOCAL MANAGEMENT

3.1 Connecting a Console....................................................................3-1

3.2 Powering-up the FDMMIM: Diagnostic Tests.............................3-4

3.3 Manually Resetting the FDMMIM...............................................3-6

CHAPTER 4 GETTING STARTED WITH FDMMIM

LOCAL MANAGEMENT

4.1 Understanding the Screens and Commands ...............................4-1

4.2 Using the Management Keyboard................................................4-2

4.3 Navigating through Local Management......................................4-2

vi

CONTENTS

4.4 Screen Organization......................................................................4-4

4.4.1 Screen Header and Message Bar Section...........................4-4

4.4.2 Data Sections and Command Menus .................................4-7

4.5 Setting FDMMIM Operating Parameters ...................................4-7

CHAPTER 5 USING THE INFORMATION SCREENS

5.1 The System Information Screen...................................................5-1

5.1.1 NETWORK TRAFFIC Data................................................5-2

5.1.2 FDDI Data ...........................................................................5-3

5.1.3 FILTER DATABASE Data..................................................5-5

5.1.4 BRIDGE PROTOCOL Data ................................................5-6

5.1.5 System Information Screen Commands.............................5-8

5.2 The Network Traffic Screen .........................................................5-9

5.2.1 Network Traffic Screen Data ............................................5-10

5.2.2 Network Traffic Screen Commands .................................5-12

5.3 The Ring Map Screen..................................................................5-13

5.3.1 Ring Map Screen Data ......................................................5-14

5.3.2 Ring Map Screen Commands ...........................................5-15

5.3.3 Adjusting the Scroll Number (n) ......................................5-15

5.4 The Node Information Screen ....................................................5-16

5.5 The Message Log Screen.............................................................5-18

5.5.1 Message Log Data .............................................................5-20

5.5.2 Message Log Screen Commands.......................................5-20

CHAPTER 6 SETTING UP THE FDMMIM

6.1 The Setup Screen ..........................................................................6-1

6.1.1 Setup Screen Data ...............................................................6-2

6.1.2 Setup Screen Commands ....................................................6-6

6.2 The Community Names Table Screen .........................................6-7

6.2.1 Community Names Table Screen Data ..............................6-8

6.2.2 Community Names Table Screen Commands ...................6-9

6.3 TFTP Code Download Setup Screen ............................................6-9

6.3.1 TFTP Code Download Setup Screen Data .......................6-10

6.3.2 TFTP Code Download Setup Screen Commands .............6-10

6.4 Image File Download with UNIX ...............................................6-11

6.5 Forcing an Image File Download ...............................................6-13

6.5.1 Forcing a Download with FDMMIM/LM..........................6-13

6.5.2 Forcing a Download with BOOTP ....................................6-14

vii

CONTENTS

CHAPTER 7 SPANNING TREE

7.1 The Bridge Protocol Screen ..........................................................7-1

7.1.1 Bridge Protocol Screen Data...............................................7-2

7.1.2 Bridge Protocol Screen Commands ....................................7-5

7.2 The Bridge Port Parameters Screen ............................................7-5

7.2.1 Bridge Port Parameters Screen Data.................................7-6

7.2.2 Bridge Port Parameter Screen Commands........................7-7

CHAPTER 8 THE FILTERING DATABASES

8.1 Bridge Operation...........................................................................8-1

8.2 The Filter Database Screen..........................................................8-2

8.2.1 Filter Database Screen Data ..............................................8-3

8.2.2 Filter Database Screen Commands....................................8-4

8.3 Display Filter Entries Screen.......................................................8-5

8.3.1 Display Filter Entries Screen Data....................................8-6

8.3.2 Display Filter Entries Screen Commands .........................8-7

8.4 Create Filter Entry Screen ...........................................................8-7

8.4.1 Create Filter Entry Screen Data ........................................8-8

8.4.2 Create Filter Entry Screen Commands..............................8-9

8.5 Delete Filter Entry Screen............................................................8-9

8.5.1 Delete Filter Entry Screen Data.......................................8-10

8.5.2 Delete Filter Entry Screen Commands ............................8-10

8.6 Special Database Screen.............................................................8-11

8.6.1 Special Database Screen Data..........................................8-12

8.6.2 Special Database Screen Commands ...............................8-13

CHAPTER 9 CONTROLLING CONCENTRATOR

MODULES AND PORTS

9.1 The FDDI Configuration Screen ..................................................9-1

9.1.1 FDDI Configuration Screen Data.......................................9-2

9.1.2 FDDI Configuration Screen Commands ............................9-4

9.2 Concentrator Status and Bridge Operations...............................9-4

viii

CONTENTS

APPENDIX A FDMMIM/LM MESSAGES

Information Messages.........................................................................A-1

Warning Messages ..............................................................................A-1

Error Messages ...................................................................................A-9

APPENDIX B SPECIFICATIONS

APPENDIX C BASIC FDDI NETWORKS

Basic FDDI Concepts ..........................................................................C-1

FDDI Media Access Protocol........................................................C-1

Reliability .....................................................................................C-3

ANSI Standard X3T9.5 ................................................................C-4

FDDI Connection Rules................................................................C-8

FDDI Devices ......................................................................................C-9

Design Considerations for FDDI Networks.....................................C-14

Ring Length ................................................................................C-14

Drive Distance ............................................................................C-14

Attenuation .................................................................................C-15

Bandwidth...................................................................................C-15

Number of Stations ...........................................................................C-15

INDEX

1-1

INTRODUCTION

CHAPTER 1

INTRODUCTION

The FDMMIM, FDMMIM-04, FDMMIM-24, and FDMMIM-30

combine the functions of an FDDI concentrator with those of an

Ethernet/802.3 to FDDI bridge. When distinguishing one module

from the other, keep the following in mind:

• All modules contain FDDI A and B ports which bridge to a

Multi Media Access Center

hub Ethernet bus.

• The FDMMIM-04 and FDMMIM-24 also contain four M type

concentrator ports.

• The master ports of the FDMMIM-24 are unshielded twisted

pair connections.

• The FDMMIM, FDMMIM-04, and the FDMMIM-24 A and B

ports are multimode fiber optic devices.

• The FDMMIM-30 is a single mode fiber optic module that

uses a class 1 laser. This laser increases the link length from

the multimode maximum drive distance of 2 kilometers (km)

to a single mode maximum of 40 km.

This manual describes how to install the FDMMIM, FDMMIM-04,

FDMMIM-24, and FDMMIM-30 and explains how to use the on-

board management tool, FDMMIM Local Management, to configure,

monitor, and control the bridge/concentrator.

Unless otherwise noted, the term FDMMIM refers to the FDMMIM,

FDMMIM-04, FDMMIM-24, and FDMMIM-30. In addition, the

terms FDMMIM/LM, Local Management, and LM refer to FDMMIM

Local Management.

1-2

INTRODUCTION

1.1 USING THIS MANUAL

You should have a general working knowledge of FDDI networks and

the ANSI X3T9.5 standard prior to installing the FDMMIM. (If you

need a review of FDDI, see Appendix C.) The following summarizes

the organization of this manual.

Chapter 1, Introduction, describes the FDMMIM and its features.

Chapter 2, Installing the FDMMIM, explains how to configure and

install the FDMMIM in a Multi Media Access Center chassis. This

chapter also explains each LANVIEW indicator.

Chapter 3, Connecting to Local Management, explains how to

connect to, and begin using, FDMMIM Local Management. This

chapter also explains the power-up diagnostic tests.

Chapter 4, Getting Started with FDMMIM Local Management,

explains conventions used in this manual to describe the Local

Management screens, and summarizes the organization of Local

Management.

Chapter 5, Using the Information Screens, describes the

following Local Management screens:

System Information Displays system status information

and contains the menu choices that

provide access to all Local

Management screens.

Network Traffic Displays detailed information about

network traffic loads at both the

Ethernet and FDDI ports.

Ring Map Displays the logical topography of the

FDDI ring.

Node Information Displays detailed information specific

to a selected node on the Ring Map.

Message Log Displays the history file that keeps

track of information, warning, and

error messages generated by Local

Management.

1-3

INTRODUCTION

Chapter 6, Setting Up the FDMMIM, explains the following Local

Management screens:

Setup Controls FDMMIM parameters.

Community Set permissions for remote access to

Names Table the FDMMIM, and create Local

Management passwords.

TFTP Code Set conditions for updating the

Download Setup FDMMIM firmware.

This chapter also provides basic TFTP code downloading

instructions, and guidelines for setting up a UNIX workstation to

handle an image file download.

Chapter 7, Spanning Tree, explains the Bridge Protocol screen and

the Port Parameters screen, which let you control the participation of

the FDMMIM in the Spanning Tree Algorithm.

Chapter 8, The Filtering Databases, explains the purpose of the

Acquired, Permanent, and Special Databases, and how to view/

manipulate their contents.

Chapter 9, Controlling Concentrator Modules and Ports,

explains how to enable/disable FDDI concentrator modules and ports

through the FDDI Configuration screen.

Appendix A, FDMMIM/LM Messages, lists each message that you

can encounter in Local Management, the probable cause of the

message, and some possible solutions.

Appendix B, Specifications, lists the electrical, physical, and

environmental specifications of the FDMMIM bridge/concentrator.

Appendix C, Basic FDDI Networks, covers basic concepts of FDDI

networks, FDDI devices, and design/installation considerations.

1-4

INTRODUCTION

1.2 GETTING HELP

If you have any questions, comments or suggestions related to the

FDMMIM or this manual, you can contact Cabletron Systems

Technical Support by any of the following methods:

By phone: Monday through Friday between

8 A.M. and 8 P.M. Eastern Standard

Time at (603) 332-9400.

By CompuServe



: GO CTRON from any ! prompt

By Internet mail: [email protected]

Before calling, please have the product serial number (located on the

FDMMIM front panel) and product type (FDMMIM, FDMMIM-04,

FDMMIM-24, FDMMIM-30) ready.

1.3 THE FDMMIM FDDI CONCENTRATOR AND ETHERNET

TO FDDI BRIDGING MODULES

The FDMMIM provides an ANSI X3T9.5 and IEEE 802.1d compliant

media interface that connects an Ethernet and FDDI network using

translation bridging. It contains the A and B ports of a modular

Dual Attached Station (DAS) or Dual Attached Concentrator (DAC).

The FDMMIM works in conjunction with the FDCMIM family of

Cabletron Systems FDDI Concentrator Modules. These devices

provide 4 or 8 M-type port connections for various cable types.

The FDCMIM-04 and FDCMIM-08 have FDDI multi-mode connector

ports. The FDCMIM-24 and FDCMIM-28 have unshielded twisted

pair connector ports. The FDCMIM-34 and FDCMIM-38 have single

mode fiber connector ports. The FDCMIM-44 and FDCMIM-48 have

shielded twisted pair connector ports. All of these devices reside in a

Multi Media Access Center (MMAC).

You can manage the FDMMIM remotely through an SNMP

management tool such as Cabletron Systems’ SPECTRUM



or

Remote LANVIEW



/Windows, or locally through an RS-232 console

port with the on-board management tool called FDMMIM Local

Management.

1-5

INTRODUCTION

Figure 1-1. FDMMIM Modules

Local Management for the FDMMIM provides module and network

information such as frame counts, error breakdowns, and bridge

information. You can view LM on a Digital Equipment Corporation

VT220 or VT320 terminal, or a PC with terminal emulation

software. Since the FDMMIM is ANSI X3T9.5 compliant, FDMMIM

Local Management can provide Station Management (SMT)

information such as ring state, station state, and ring configuration.

LINK

FDDI

FDMMIM

SN

RESET

Y

P

S

A

B

F

D

I

M

O

D

E

M

C

O

N

S

O

L

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A

F

D

I

STBY

SYOK

XMT

RCV

CLN

POK

PWR

TWR

XMT

RCV

WRP

ROP

ENET

FDDI

LINK

SMF-PMD

FDDI

FDMMIM-30

SN

RESET

Y

P

S

A

B

F

D

I

M

O

D

E

M

C

O

N

S

O

L

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A

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I

STBY

SYOK

XMT

RCV

CLN

POK

PWR

TWR

XMT

RCV

WRP

ROP

ENET

FDDI

LINK

UTP-PMD

FDDI

FDMMIM-24

SN

RESET

Y

P

S

A

B

F

D

I

M

O

D

E

M

C

O

N

S

O

L

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A

F

D

I

STBY

SYOK

XMT

RCV

CLN

POK

PWR

TWR

XMT

RCV

WRP

ROP

ENET

FDDI

3

LNKPST

2

LNKPST

1

LNKPST

4

LNKPST

LINK

FDDI

FDMMIM-04

SN

RESET

Y

P

S

A

B

F

D

I

M

O

D

E

M

C

O

N

S

O

L

E

A

F

D

I

STBY

SYOK

XMT

RCV

CLN

POK

PWR

TWR

XMT

RCV

WRP

ROP

ENET

FDDI

LNKPST

LNK

PST

LNK

PST

LNK

PST

1

2

3

4

1-6

INTRODUCTION

The FDMMIM can accept an Optical Bypass Switch (Figure 1-2). If

you use this optional device, the fiber optic connections pass through

the switch, automatically switching to a bypass mode. This feature

maintains ring continuity, if the bridge module loses power.

The MMAC Ethernet “A” Bus provides the Ethernet interface.

Ethernet traffic accesses the bus through the EMME (Ethernet

Management Module with Ethernet), IRM (Intelligent Repeater

Module) series, or any Cabletron Ethernet Management Module.

Figure 1-3 represents a typical FDDI to Ethernet bridge.

Figure 1-2. Optical Bypass Switch

1-7

INTRODUCTION

FDMMIM

FDDI Ring

Connections

AB

IRM3

FDCMIM

MMAC

ETHERNET

BUS

MMAC

FDDI

BUS

ETHERNET

NETWORK

FIGURE 1-3. Bridging FDDI to Ethernet with the FDMMIM

1.4 FDMMIM FEATURES

LANVIEW

LANVIEW is a visual diagnostic and status monitoring system

developed by Cabletron Systems. LEDs on the FDMMIM front panel

indicate the status of the FDMMIM and can help identify module

and physical layer problems.

Hot Swapping

Like all Cabletron Systems Media Interface Modules, you can

remove the FDMMIM from, and insert it into, an MMAC without

turning off the power to the rest of the modules in the hub.

1-8

INTRODUCTION

Management

An RS-232 console port gives you direct access to FDMMIM Local

Management. Here you can check bridge statistics, and control the

bridge and FDDI port configuration. The FDMMIM also supports

SNMP network management tools such as Cabletron Systems’

SPECTRUM products.

Shared Memory

The FDMMIM has 4 Mbytes of DRAM buffer memory which it uses

for storing data frames. The on-board processor and other support

logic also use this memory.

Local Memory

In addition to the buffer memory, the FDMMIM CPU operates with

4 Mbytes of DRAM, and uses 512 Kbytes of FLASH memory to store

its on-board software.

Battery Back-up RAM

The FDMMIM saves its Local Management statistics and operating

parameters in battery backed up RAM. The battery retains user-

configured settings, when the FDMMIM loses power or is turned off.

Source Address Table Size

The FDMMIM uses a learning and filtering algorithm and can retain

up to 8,192 source address static or dynamic table entries.

Spanning Tree Algorithm

The FDMMIM supports both 802.1d and DEC Spanning Tree

Algorithm (STA) protocols.

FlASH EEPROM Memory Support

As Cabletron Systems makes enhancements to Local Management,

you can upgrade your FDMMIM by downloading new software

images into the FDMMIM FLASH EEPROM (electrically erasable

programmable read only memory).

Through Local Management, you can control the download path of

an image file between your FDMMIM and a network server, such as

a remote network management tool like Remote LANVIEW/Windows

or even a UNIX workstation. The FDMMIM also provides a way to

broadcast a request for an image file using the BOOTP switch.

Chapter 6 provides more information regarding image file download

using FDMMIM Local Management or the BOOTP switch.

2-1

INSTALLING THE FDMMIM

CHAPTER 2

INSTALLING THE FDMMIM

The FDMMIM is a media interface module (MIM) that fits into a

Cabletron Systems MMAC network hub. You can install the

FDMMIM in any MMAC slot except for slot 1 (the right-most slot).

This chapter describes:

• Configuring your MMAC hub

• Setting the FDMMIM hardware configuration switch

• Activating the battery

• Installing the FDMMIM into the MMAC

• Connecting the fiber optic cables

Connecting to the Console port is described in Chapter 3,

Connecting to Local Management.

Note: Be sure to activate the battery before you install the FDMMIM.

The battery is disabled for shipment. If you do not activate the

battery, all bridge configuration settings reset to default values when

you turn off the power.

2.1 BEFORE YOU INSTALL THE FDMMIM . . .

Installing an FDMMIM is a simple process of setting the switches

and battery jumper, sliding the module into an MMAC slot, and

connecting the fiber optic cables. But before you start the

installation, you should decide how you want to configure the

MMAC. The location of an FDMMIM in an MMAC can affect

communication between MIMs and your ability to manage MIMs. To

help you properly configure your MMAC, this section lists MMAC

configuration guidelines, and then explains how an FDMMIM can

reside in an MMAC that also holds Ethernet or Token Ring MIMs.

2-2

INSTALLING THE FDMMIM

2.1.1 Adding MIMs to an MMAC

The following examples provide only a sampling of possible MIM and

MMAC combinations. Refer to Appendix B for a list of FDMMIM and

FDCMIM power requirements. In addition, when configuring an

MMAC, remember the following:

• MMAC-3FNB board slot numbers increment from bottom to

top. MMAC-5FNB, MMAC-8FNB and MMAC-M8FNB board

slot numbers increment from right to left.

• The first slot in every MMAC is a narrow slot reserved for a

half-width management module, such as the TRMM, IRM-3

or EMME. Do not place full-width modules in the first slot of

an MMAC. When not using half-width management

modules, leave the first slot empty.

• An MMAC-5FNB can hold four MIMs, one management

module, and two power supplies. By removing one power

supply, the MMAC-5FNB can hold an extra MIM, assuming

that the remaining power supply has enough capacity to

handle the combined load of the resident MIMs.

• FDDI MIMs consume more power than other MIMs. Some of

the older MMACs may not have enough power available to

support a planned configuration. For example, the combined

load of an FDCMIM-08 and an FDMMIM exceeds the

available power of an MMAC-3FNB (Figure 2-1).

12.0 amps

(MMAC-3FNB

Power Suppy

Output)

8.0 amps

FDMMIM

11.8 amps

FDCMIM-08

Figure 2-1. FDDI MIMs in an MMAC-3FNB

2-3

INSTALLING THE FDMMIM

Figure 2-2 represents an MMAC-5FNB equipped with dual

power supplies, two FDCMIM-08s and an FDMMIM-04. The

MMAC has enough power to support the configuration.

However, the combined load of the modules exceeds the

output of a single power supply. This means that the hub

does not have redundant power (the ability of one power

supply to assume the entire load if one supply fails).

48.0 amps

(MMAC-5FNB

Dual Power

Supply Output)

11.8 amps

FDCMIM-08

11.8 amps

FDCMIM-08

12.5 amps

FDMMIM-04

Figure 2-2. FDDI MIMs in an MMAC-5FNB

Figure 2-3 represents an MMAC-M8FNB equipped with a

full complement of power supplies, two FDCMIM-08s, and

one FDMMIM-04. The MMAC power supplies produce up to

80 amps of power, providing more than double the power

necessary for operation. This configuration provides

redundant power to the hub.

80.0 amps

(MMAC-M8FNB

Dual Power

Supply Output)

11.8 amps

FDCMIM-08

11.8 amps

FDCMIM-08

12.5 amps

FDMMIM-04

Figure 2-3. FDDI MIMs in an MMAC-M8FNB

When unsure of a hub’s ability to support a planned MIM

configuration, check the appropriate manuals to determine

the amount of power consumed by each MIM (amps at 5 Vdc),

and then check your MMAC power supply configuration

(single or multiple power supplies) to determine if you have

sufficient power available to support the configuration.

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