Cabletron Systems FDMMIM, FDMMIM-24, FDMMIM-30, FDMMIM-04 Installation And User Manual

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

The Complete Networking Solution

NOTICE

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

All Rights Reserved
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.

i

FCC NOTICE

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

ii

NOTICE

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.

iii

FCC NOTICE

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.

iv

CONTENTS

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

v

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

vi

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

vii

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

viii

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 on­board 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.

1-1

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.

1-2

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.

1-3

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 [phone].
By CompuServe: GO CTRON from any ! prompt
By Internet mail: [e-mail]

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.

1-4

INTRODUCTION

FDMMIM

SN

ENET

FDDI

RESET

PWR
TWR

XMT
RCV

WRP

ROP

FDDI

FDMMIM-04

SN

STBY
SYOK
XMT
RCV
CLN
POK

B
Y
P
A

PST

S
S

F
D
D
I
A

LINK

PST

F
D
D
I
B

M
O
D

PST

E
M

C
O
N
S
O
L
E

RESET

ENET

FDDI

LNKPST

PWR
TWR

XMT
RCV

1

WRP

ROP

LNK

2

LNK

3

LNK

4

FDDI

FDMMIM-24

SN

STBY
SYOK
XMT
RCV
CLN
POK

B
Y
P
A
S
S

F
D
D
I
A

LINK

F
D
D
I
B

M
O
D
E
M

C
O
N
S
O
L
E

RESET

ENET

FDDI

PWR
TWR

XMT
RCV

WRP

ROP

LNKPST

1

LNKPST

2

LNKPST

3

LNKPST

4

UTP-PMD

FDDI

FDMMIM-30

SN

STBY
SYOK
XMT
RCV
CLN
POK

B
Y
P
A
S
S

F
D
D
I
A

LINK

F
D
D
I
B

M
O
D
E
M

C
O
N
S
O
L
E

RESET

ENET

FDDI

PWR
TWR

XMT
RCV

WRP

ROP

SMF-PMD

FDDI

STBY
SYOK
XMT
RCV
CLN
POK

B
Y
P
A
S
S

F
D
D
I
A

LINK

F
D
D
I
B

M
O
D
E
M

C
O
N
S
O
L
E

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.

1-5

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.

1-6

Figure 1-2. Optical Bypass Switch

INTRODUCTION

ETHERNET

NETWORK

FDCMIM

MMAC

FDDI

BUS

FDMMIM

FDDI Ring

Connections

AB

MMAC

ETHERNET

BUS

IRM3

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.

1-7

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 user­configured 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.

1-8

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.

2-1

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).

11.8 amps

FDCMIM-08

8.0 amps

FDMMIM

12.0 amps

(MMAC-3FNB

Power Suppy

Output)

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

2-2

INSTALLING THE FDMMIM

11.8 amps

FDCMIM-08

11.8 amps

FDCMIM-08

12.5 amps

FDMMIM-04

11.8 amps

FDCMIM-08

11.8 amps

FDCMIM-08

12.5 amps

FDMMIM-04

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)

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)

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.

2-3

INSTALLING THE FDMMIM

2.1.2 MMAC Configurations

The FDMMIM can bridge FDDI and Ethernet. Since the Ethernet
interface to the FDMMIM is through an MMAC Ethernet bus, the
bridging function requires that you have both Ethernet and FDDI
modules in the same MMAC. To help you configure your MMAC,
consider two common MMAC configurations:

• An IRM-3 Ethernet management module, Ethernet MIMs, an
FDMMIM, and an FDCMIM

• An EMME Ethernet management module, at least one
Ethernet Repeater MIM, an FDMMIM, and an FDCMIM.

The examples in this section include both an FDMMIM and an
FDCMIM. An FDCMIM is not required; it merely adds master ports
to the FDMMIM concentrator.

2.1.3 IRM-3 and Ethernet MIMs with FDMMIMs

This example uses the IRM-3, but the same guidelines apply if you
are using an IRM, IRM-2, or IRBM.

In the example configuration shown in Figure 2-4, the MMAC-5FNB
has an IRM-3 in slot 1 and TPMIM-22s in slots 2 and 3. Slot 4 holds
an FDMMIM-04 and slot 5 holds an FDCMIM-04.

The IRM-3, designed to reside in slot 1, lets you manage the
Ethernet side of the hub network. The FDMMIM-04, manages the
FDDI side of the network and controls the bridging functions.

The FDMMIM-04 in slot 4 connects to the:

• Ethernet network through the MMAC Ethernet bus

• FDCMIM through the MMAC FDDI bus

• FDDI ring through its A and B ports.

2-4

INSTALLING THE FDMMIM

10BASE-T
ETHERNET

IRM3

RCV

SN
LNK
ERR

1

RESET

POWER

2
3
4
5

FAIL

SN

ON OFF

T
X

R
X

BOK
RCV
POK

M
O
D
E
M

OK

MMAC - 5PSM

C
O
N
S

OFF

O
L
E

ON

PWR

6
7

MGMT

8

CLN

9
10
11
12

1
X

2
X

3
X

4
X

5
X

6
X

7
X

8
X

9
X

10

X

11

X

12

X

ETHERNET

POWER

FAIL

SN

OK

MMAC - 5PSM

OFF

ON

FDCMIM-04

SN

PST

PST

PST

FDDI

FDMMIM-04

SN

PWRFNB

LNKPST

1

LNK

2

LNK

3

LNK

4

ENET

FDDI

LNKPOK

1

LNKPOK

2

LNKPOK

3

LNKPOK

4

FDDI

TPMIM-22

SN

RESET

STBY

PWR
TWR

SYOK

XMT

XMT

RCV

RCV

WRP

CLN

ROP

POK

B
Y
P
A
S
S

F
D
D
I
A

LINK

F
D
D
I
B

M
O
D
E
M

C
O
N
S
O
L
E

10BASE-T
ETHERNET

RCV
LNK
ERR

1
2
3
4
5
6
7
8

9
10
11
12

1
X

2
X

3
X

4
X

5
X

6
X

7
X

8
X

9
X

10

X

11

X

12

X

TPMIM-22

SN

Figure 2-4. FDDI and Ethernet MIMs in the Same Hub

2.1.4 EMME and RMIMs with an FDMMIM

The EMME, a narrow Ethernet management module, works with the
repeater interface controller family of MIMs (RMIM): TPRMIM,
CXRMIM, and FORMIM. RMIMs can take full advantage of the
MMAC’s Flexible Network Bus (FNB), making them unique. You can
configure the RMIMs to use either the B or C bus of the FNB. This
means that an RMIM can put Ethernet traffic on MMAC buses that
normally see Token Ring and FDDI traffic. The EMME can manage
Ethernet traffic on the A bus (the dedicated Ethernet bus), either
FNB data bus, the D bus (accessed through the front panel), and can
bridge traffic among the A, B, C, and D networks.

Even though RMIMs can place Ethernet traffic on the bus that
normally handles FDDI traffic, FDDI MIMs can still reside in the
same hub with RMIMs. RMIMs determine whether or not the MIM
that resides in the next higher numbered MMAC slot is an Ethernet
MIM. If the next MIM is not an Ethernet MIM, the RMIM activates
relays that, in effect, terminate the B and C buses. To eliminate
potential problems, we recommend installing the RMIMs in lower
numbered slots and the FDDI MIMs in higher numbered slots.

2-5

INSTALLING THE FDMMIM

To demonstrate this MIM interaction, assume that we have an
MMAC-5FNB configuration as follows:

Slot 1 - EMME
Slot 2 - TPRMIM-36
Slot 3 - FDMMIM
Slot 4 - FDCMIM-04

After turning on the MMAC, the TPRMIM checks the MIM in slot 3.
When it determines that slot 3 does not hold an Ethernet MIM, it
activates the relays that terminate the Ethernet section of the B and
C buses. The FDDI MIMs can put FDDI frames on the C bus because
the FDDI portion of the C bus is physically isolated from the
Ethernet portion. This example uses the TPRMIM, but the same
would be true if you were using any of the other RMIMs as well.

For a more thorough description of the RMIMs and how they use the
MMAC buses, see your RMIM documentation.

2.2 INSTALLING THE FDMMIM

Caution: Observe all static precautions when handling boards.

Always leave the FDMMIM inside the protective bag when the MIM
is not installed in an MMAC. If you need to set the MIM down
during installation, set it on a clean, non-conducting surface.

Before you actually install the FDMMIM into the MMAC, you must
activate the battery and set any bridge configuration switches.

2.2.1 Setting Jumpers

Your FDMMIM uses a Nicad battery to maintain power to the RAM
in the event of power loss. The RAM holds all bridge configuration
data. To prevent the battery from discharging during shipment, the
factory sets the battery jumper to the disabled position. You must
enable the battery before you install the FDMMIM. Figure 2-5 shows
the location of the three pin battery jumper. To activate the battery:

• Position the plastic jumper so that it connects the right two
pins of JP1.

2-6

INSTALLING THE FDMMIM

Jumper JP6 (Figure 2-5) is a laser jumper. This jumper has no affect
on FDMMIM operation; it simply indicates to non-FDDI manage­ment modules that it is an FDDI single mode or multimode board.
This jumper is set at the factory; you need not change its position.

2.2.2 Setting Configuration Switches

Before installing your FDMMIM, you must set the bridge
configuration switches to select initial configuration options. Though
the modular switch bank holds eight switches, the FDMMIM utilizes
only a few of them. (See Figure 2-6.)

Note: At power-up, configuration switch settings override Local
Management settings. This means that when you cycle MMAC power
or reset the FDMMIM, LM settings default to their corresponding
configuration switch settings.

Locate the switch bank along the top edge of the FDMMIM and
FDMMIM-30 (Figure 2-5). On the FDMMIM-04 and FDMMIM-24,
the switch bank resides just below the daughter board containing the
M type ports.

LASER

Configuration

Switch

Set to LASER (on
FDMMIM-30 only)

JP6

LASER

JP6

FDMMIM

Laser

Front Panel

Jumper (JP6)

V

N

I

I

E

A

W

L

P

PMB 3.6B

B

S

A

E

T

I

JP1

T

R

E

ON

OFF

Battery

ON

OFF

JP1

ON

Battery
Jumper (JP1)

Figure 2-5. Battery Activation/Switch Bank Location

Battery

2-7

INSTALLING THE FDMMIM

Figure 2-6 shows the general location of the switch bank and the
configuration switch options.

Note: The FDMMIM is shipped with all switches in the ON position.

1. ON - Forward broadcast packets
OFF - Filter broadcast packets

2. Not used

3. Not used

4. ON - Multimode Fiber
OFF - Single Mode Fiber

Note: Switch #4 does not affect
operation; this switch simply tells
LM whether it is a Multimode
or Single Mode board.

ON

1 2 3 4 5 6 7 8

2-8

8. ON - Normal
OFF - Manufacturing use only

7. BOOTP toggle switch
(for emergency boot-up, and
download use only -- see Chapter 6)

6. Not used

5. Not used

Figure 2-6. Configuration Switch Settings

INSTALLING THE FDMMIM

2.2.3 Installing into the MMAC

After configuring your MIMs, activating the FDMMIM battery, and
setting any FDMMIM configuration switches, proceed as follows:

Note: We recommend powering-down your MMAC before removing
FDMMIMs, even though these modules have “hot swap” capabilities.

1. Turn off the power to the MMAC. Remember that MMACs with
multiple power supplies have an On/Off switch for each supply.

2. Holding the FDMMIM by the front panel or by the edges of the
circuit board, align the bottom and top edges of the card with the
slot guides in the MMAC chassis. Be sure that both the bottom
and top edges of the card rest in the guide slots. (See Figure 2-7.)

3. Slide the FDMMIM into the MMAC until you feel it meet the
backplane. At this point, the front panel should be about 1/2 inch
from being flush with the rest of the modules in the MMAC.

4. Press gently to seat the module into the backplane. Do not try to
force the module into place or use the knurled knobs to draw the
module into the backplane. Forcing a misaligned module into
place can damage the FDMMIM or the MMAC backplane.

5. Once the module seats in the backplane, tighten the two knurled
knobs. This step is important. If you do not tighten the knurled
knobs, vibration can cause the module to lose contact with the
backplane and disrupt your network.

2-9

INSTALLING THE FDMMIM

FOMIM-22

FDMMIM-04

SN

SN

POWER

FAIL

SN

OK

MMAC - 5PSM

OFF

ON

RESET

PWR

ENET

FDDI

LNKPOK

STBY

PWR
TWR

SYOK

XMT

XMT

TX

RCV

RCV

1

WRP

CLN

RX

ROP

POK

B
Y

TX

P
A
S

RX

LNK

POK

POK

POK

S
F

D

2

TX

D
I

RX

A

LINK

TX

LNK

RX

F
D
D

3

I

TX

B

RX

M
O
D
E

LNK

TX

M

RX

C
O
N

4

S

4

O
L
E

ETHERNET

FDDI

Figure 2-7. Installing the FDMMIM into the MMAC

2.3 CONNECTING FIBER OPTIC CABLING

IRM3

SN

RESET

POWER

FAIL

SN

BOK
RCV
POK

MMAC - 5PSM

C
O
N
S

OFF

O

L

E

ON

M
O
D
E
M

OK

PWR

MGMT

CLN

ON OFF

T
X

R
X

ETHERNET

You can install the FDMMIM as a Dual Attached Station (DAS),
with or without an optical bypass switch. Figure 2-8 illustrates the
main ring cabling to the FDDI A and B ports on the FDMMIM.
Figure 2-9 shows the duplex cable connections to the A and B ports.
When installed, the optical bypass switch connects in series between
the main ring connections and the FDMMIM. (For a summary of
FDDI connection rules, see Appendix C.)

2-10

Primary In

Red Key

Secondary

Out

Secondary

In

Blue Key

Primary

Out

INSTALLING THE FDMMIM

F

D
D

I

A

F
D

D

I

B

Figure 2-8. FDMMIM Duplex Fiber Optic Receptacles

The Optical Bypass Switch (also known as a Station Bypass Switch
or a Bypass Relay) is an X3T9.5 compliant device that automatically
isolates the FDMMIM from the ring if the FDMMIM fails or the
FDMMIM power source fails. The bypass switch is optional. If you
use this optional device, you should remember the following:

• A bypass switch causes some signal loss which may cause

you to exceed the maximum allowable loss between stations.

• Bypass technology can protect only a small number of

consecutive bypassed stations. The exact number varies but
in a typical building environment, the maximum is three.

2-11

INSTALLING THE FDMMIM

Secondary

Ring

Primary

Ring

Optical
Bypass

BYP ASS FDDI A FDDI B

Secondary

Ring

Primary

Ring

FDMMIM

Figure 2-9. FDMMIM Dual Ring Connections

Through a Bypass Switch

When installing an optical bypass switch, begin with steps 1 and 2
below to attach the duplex main ring cabling to the switch.
Otherwise, begin with step 3.

Note: If you install the bypass switch with the FDMMIM powered-up,
it can take up to five seconds before the FDMMIM recognizes the
switch.

1. Attach the main ring cables to the optical bypass switch by
inserting the A and B duplex connectors into their respective
keyed receptacles on the optical bypass switch.

2. Attach the small bypass cable connector at the FDMMIM Bypass
receptacle. Figure 2-10 shows the bypass switch cable
configuration.

3. Attach the Type A and Type B duplex connectors at their
respective FDDI receptacles (FDDI A and FDDI B) on the
FDMMIM front panel.

2-12

INSTALLING THE FDMMIM

Enable-A
Enable-B

Ground
Ground

Bypass Present

Ground

1
2
3
4
5
6

Figure 2-10. Bypass Switch Cable Configuration

2.4 FDMMIM-04 AND FDMMIM-24 MASTER PORT CABLE

CONNECTIONS

The FDMMIM-04 and FDMMIM-24 have four M type concentrator
ports. The FDMMIM-04 ports are fiber connections (keyed green),
and the FDMMIM-24 ports are Unshielded Twisted Pair connections.

You can use these ports, to connect FDDI nodes, such as
workstations, to the dual ring. You can also attach M ports to the A
and B ports of another concentrator, to create a dual homing
(redundant concentrator) configuration (Refer to Appendix C, Basic

FDDI Networks, for additional information on dual homing).

2.5 TWISTED PAIR PINOUT CONFIGURATION

This section provides the RJ-45 pinout configuration for Unshielded
Twisted Pair (UTP) and Shielded Twisted Pair (STP) Physical Layer
Medium Dependent (PMD) ports. See Figure 2-11.

Note: When connecting two twisted pair ports together (e.g., an M
type port on an FDCMIM-24 to an F7069 Desktop Network Interface
(DNI) card.), a transmit and receive cross-over must occur between
the two devices (i.e., within the cable).

2-13