Cabletron Systems 3F00-01, 3F55-01 User Manual

FDDI DUAL-ATTACHED
INTELLIGENT MODULE

(3F00-01 AND 3F55-01)

USER’S GUIDE

3F00-01

OFFLINE

3F55-01

OFFLINE

FDDI MIC A FDDI MIC B

MULTI-MODE MULTI-MODE

FDDI MIC A FDDI MIC B

SINGLE-MODE SINGLE-MODE

OPTICAL BYPASS

OPTICAL BYPASS

RING A
RING B

RING A
RING B

THRU

THRU

SN

WRAP

SN

WRAP

RX PROC

PWR

TX

RX PROC

PWR

TX

9031876-02

Only qualified personnel should perform installation
procedures.

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.



Copyright 1997 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in the United States of America

Order Number: 9031876-02 January 1998

Cabletron Systems, SPECTRUM,

Workgroup
Systems, Inc.

All other product names mentioned in this manual may be trademarks or registered trademarks of
their respective companies.

SmartSwitch, FEPIM, FEPIM-TX

and

LANVIEW

are registered trademarks and MMAC/

and

FEPIM-FX

are trademarks of Cabletron

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:

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:

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

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

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

FDDI Dual-Attached Intelligent Module User’s Guide i

Printed on Recycled Paper

Notice

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:

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.

Before utilizing this product, carefully read this License Agreement.

ii FDDI Dual-Attached Intelligent Module User’s Guide

CABLETRON SOFTWARE PROGRAM LICENSE

Notice

1. LICENSE

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 LA W. 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.

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

EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY

1. EXCLUSION OF

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 A CCOMPANYING HARDWARE.

WARRANTY. Except as may be specifically provided by Cabletron in

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.

FDDI Dual-Attached Intelligent Module User’s Guide iii

Notice

DECLARATION OF CONFORMITY

Application of Council Directive(s):

Manufacturer’s Name:

Manufacturer’ s Address:

European Representative Name:

European Representative Address:

Conformance to Directive(s)/Product Standards:

Equipment Type/Environment:

89/336/EEC
73/23/EEC

Cabletron Systems, Inc.
35 Industrial Way

PO Box 5005
Rochester, NH 03867

Mr. J. Solari
Cabletron Systems Limited

Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG13 2PZ, England

EC Directive 89/336/EEC
EC Directive 73/23/EEC
EN 55022
EN 50082-1
EN 60950

Networking Equipment, for use in a
Commercial or Light
Environment.

Industrial

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

iv FDDI Dual-Attached Intelligent Module User’s Guide

CONTENTS

CHAPTER 1 INTRODUCTION

1.1 Overview......................................................................................1-2

1.2 Standards....................................................................................1-3

1.3 Connectors..................................................................................1-3

1.4 LEDs............................................................................................1-4

1.5 Document Conventions...............................................................1-4

1.6 Related Documentation...............................................................1-5

1.7 Getting Help.................................................................................1-6

CHAPTER 2 CONNECTING TO THE NETWORK

2.1 Configuration Options..................................................................2-1

2.1.1 Dual-attached Station .....................................................2-2

2.1.2 Dual-homed Single-attached Station..............................2-3

2.1.3 Single-attached Station................................................... 2-4

2.1.4 Optical Bypass Switch ....................................................2-5

2.2 LED Power-up Sequence............................................................2-5

2.2.1 3F00-01 LED Sequence .................................................2-6

2.2.2 3F55-01 LED Sequence .................................................2-7

2.3 Keying of Media Interface Connectors ........................................2-8

2.3.1 A and B Keying...............................................................2-9

2.3.2 M and S Keying ............................................................2-10

2.4 Connecting the 3F00-01 or 3F55-01 to the Network.................2-10

2.4.1 Pre-connection Information........................................... 2-10

2.4.2 Connecting Dual-attached Stations ..............................2-11

2.4.3 Connecting Dual-homed Single-attached Stations.......2-12

2.4.4 Connecting Single-attached Stations............................ 2-12

2.4.5 Connecting the Optical Bypass Switch.........................2-13

CHAPTER 3 CONFIGURING THE 3F00-01 AND 3F55-01

3.1 Configuration...............................................................................3-1

3.1.1 SMT Version 6.2.............................................................3-2

3.1.2 SMT Version 7.3.............................................................3-3

FDDI Dual-Attached Intelligent Module User’s Guide v

Contents

CHAPTER 4 MONITORING AND MANAGING

THE 3F00-01 AND 3F55-01

4.1 Displaying the Module Status ......................................................4-2

4.2 Statistics.......................................................................................4-4

4.2.1 Module Status and Statistics...........................................4-5

4.2.2 Port Status and Statistics................................................4-5

4.2.2.1 General Port Status and Statistics..................4-5

4.2.2.2 Port Receive Statistics....................................4-6

4.2.2.3 Port Transmit Statistics...................................4-7

4.2.2.4 Port Error Status and Statistics.......................4-7

4.2.3 3F00-01/3F55-01 Port SMT Status.................................4-8

4.2.3.1 SMT Version 6.2.............................................4-8

4.2.3.2 SMT Version 7.3.............................................4-9

4.2.4 3F00-01/3F55-01 Port MAC Status...............................4-11

4.2.4.1 SMT Version 6.2...........................................4-11

4.2.4.2 SMT Version 7.3...........................................4-13

4.2.5 3F00-01/3F55-01 Port PHY Status ...............................4-16

4.2.5.1 SMT Version 6.2...........................................4-16

4.2.5.2 SMT Version 7.3...........................................4-17

4.2.6 3F00-01/3F55-01 PATH Group.....................................4-18

CHAPTER 5 DIAGNOSTICS AND TROUBLESHOOTING

5.1 Power-up Tests............................................................................5-1

5.2 Operational Diagnostics...............................................................5-3

5.2.1 Troubleshooting...............................................................5-3

5.2.2 Connectivity Problems.....................................................5-4

CHAPTER 6 ADDING/SWAPPING MODULES

6.1 Unpacking the Switch Module......................................................6-1

6.2 Adding a 3F00-01 or 3F55-01......................................................6-1

6.3 Swapping a 3F00-01 or 3F55-01.................................................6-2

APPENDIX A TECHNICAL SPECIFICATIONS

A.1 Data Rate.................................................................................... A-1

A.2 Standards Compliance................................................................ A-1

A.3 Certifications ...............................................................................A-1

A.4 Fiber Cable .................................................................................A-1

vi FDDI Dual-Attached Intelligent Module User’s Guide

Contents

A.5 Optical .........................................................................................A-2

A.6 Interface.......................................................................................A-2

A.7 Status LEDs.................................................................................A-2

A.8 Connectors..................................................................................A-2

A.9 Max Power Requirements...........................................................A-2

A.10 Physical.......................................................................................A-2

A.11 Environmental..............................................................................A-3

APPENDIX B CABLING INFORMATION

B.1 Cables and Connectors...............................................................B-1

INDEX

FDDI Dual-Attached Intelligent Module User’s Guide vii

Contents

viii FDDI Dual-Attached Intelligent Module User’s Guide

CHAPTER 1

INTRODUCTION

This manual is for system administrators responsible for configuring,
monitoring, and maintaining the ATX. It should be used with the

User Guide

chapter are described below.

and the

ATX MIB Reference Guide

. The contents of each

ATX

• Chapter 1,

provides an overview of the 3F00-01 and 3F55-01.

• Chapter 2,

attach the module to a network.

• Chapter 3,

software configuration options for the module.

• Chapter 4,

provides information on the statistics and traffic analysis a v ailable for
the module.

• Chapter 5,

problems with the module and how to solve them.

• Chapter 6,

installing a new 3F00-01/3F55-01 and replacing a 3F00-01/3F55-01.

• Appendix A,

about the module.

Introduction

Connecting to the Network

Configuring the 3F00-01 and 3F55-01

Monitoring and Managing the 3F00-01 and 3F55-01

Diagnostics and Troubleshooting

Adding/Swapping Modules

Technical Specifications

, outlines the contents of this manual and

, describes how to physically

, discusses the

, discusses detecting

, gives instructions for

, lists technical information

,

• Appendix B,

FDDI Dual-Attached Intelligent Module User’s Guide Page 1-1

Cabling Information

, provides cable pinouts.

Chapter 1:

Introduction

1.1 OVERVIEW

The FDDI 3F00-01 and the 3F55-01 are dual-attached modules that
connect the ATX to a Fiber Distributed Data Interface (FDDI) network.
Multiple 3F55-01s and 3F00-01s can be installed in one ATX.

Both modules support a wide range of applications, such as intra-facility
or campus backbones, and client/server configurations. Figure 1-1 shows
a typical campus backbone application, with the ATX linking independent
workgroups on Ethernet and Token-Ring LANs to a high-performance
FDDI backbone.

10BASE-T

Ethernet

10BASE-2

Ethernet

Token-Ring

Token-Ring

Figure 1-1 Typical Network Configuration

ATX

ATX

ATX

FDDI

The 3F00-01 uses standard multimode fiber. The 3F55-01 uses single
mode fiber for extended distance capability. The extended distance
capability for single mode fiber is dependent upon how you want to
allocate your power budget. The 3F00-01 and the 3F55-01 allow the ATX
to be connected to the FDDI ring as a dual-attached station, dual-homed
single-attached station, or single attached station. Both modules support

Page 1-2 FDDI Dual-Attached Intelligent Module User’s Guide

Chapter 1:

Introduction

an external Optical Bypass Switch (OBS) that allows full FDDI operation
to continue if the ATX is disabled.

Both FDDI standard station management (SMT) and SNMP are
supported, allowing you to use a v ariety of network management software
to configure your 3F00-01/3F55-01 and monitor your network.

Both the 3F00-01 and 3F55-01 are protected by a built-in temperature
sensor that sends an alarm if the module overheats. Local and remote
loopback tests on the module, and front panel LEDs showing the ring
status, aid in troubleshooting and diagnostics.

1.2 STANDARDS

The 3F00-01 and 3F55-01 comply with the following standards:

• ANSI X3T9.5 (PMD, PHY, MAC, and SMT)

• IEEE 802.1d and 802.1i

1.3 CONNECTORS

The 3F00-01 and 3F55-01 each have three connectors that are shown in
Figure 1-2 and Figure 1-3:

• Two Media Interface Connector (MIC) receptacles – an A port and a

B port.

• One RJ-11 modular jack, for connecting an optional Optical Bypass

Switch (OBS). (The OBS is not supplied with the 3F00-01 or the
3F55-01.)

RING A
RING B

THRU

SN

WRAP

RX PROC

PWR

TX

3F00-01

OFFLINE

FDDI MIC A FDDI MIC B

MULTI-MODE MULTI-MODE

OPTICAL BYPASS

Figure 1-2 3F00-01 Front Panel

3F55-01

OFFLINE

FDDI MIC A FDDI MIC B

SINGLE-MODE SINGLE-MODE

FDDI Dual-Attached Intelligent Module User’s Guide Page 1-3

OPTICAL BYPASS

Figure 1-3 3F55-01 Front Panel

RING A
RING B

THRU

SN

WRAP

RX PROC

PWR

TX

Chapter 1:

Introduction

1.4 LEDS

The 3F00-01 front panel (Figure 1-2) contains 8 green LEDs:

• Processor status (PROC)

• Power OK (PWR)

• Receive activity (RX)

• Transmit activity (TX)

• Thru mode – one per primary and secondary ring (THRU)

• Wrap mode – one per primary and secondary ring (WRAP)
The 3F55-01 front panel (Figure 1-3) contains 8 green LEDs:

• Processor status (PROC)

• Power OK (PWR)

• Receive activity (RX)

• Transmit activity (TX)

• Thru mode – one per primary and secondary ring (WRAP)

• Wrap mode – one per primary and secondary ring (THRU)

1.5 DOCUMENT CONVENTIONS

The following conventions are used in presenting information in this
manual:

LCM commands, prompts, and information displayed by the computer
appear in Courier typeface:

Current Number of Static Addresses: 5
Current Number of Learned Addresses: 133
Number of Defined Filters: 4

Information that you enter appears in Courier bold typeface:

ATX >

Page 1-4 FDDI Dual-Attached Intelligent Module User’s Guide

status

Chapter 1:

Introduction

Information that you need to enter with a command is enclosed in angle
brackets < >. For example, you must enter a MAC address to execute the
address matrix

<MAC address>

command:

ATX >

address matrix 00:40:27:04:1a:0f

Field value options appear in bold typeface. F or e xample, a filter type can
be either

Entry

or

Exit

.

Note: A note provides additional information or describes the possible
consequence of a specific action you may perform.

Caution: A caution alerts you that a specific action you may perform
could damage your computer equipment, server communication with your
ATX, or cause data to be lost.

Warning: A warning means you could cause physical harm to yourself.
Follow the guidelines in the manual or on the unit itself when handling
electrical equipment.

1.6 RELATED DOCUMENTATION

You may need to refer to the following documentation when you are using
your ATX:

•

ATX User Guide

for the ATX.

•

ATX MIB Reference Guide

If you need internetworking reference material, you may find the
following books helpful:

•

Interconnections, Bridges and Routers



Wesley

•

Internetworking with TCP/IP: Principles, Protocols, and Architectur e

1992.

(2nd edition), Volumes I and II, Douglas Comer, Prentice Hall

•

The Simple Book, An Introduction to Management of TCP/IP-based
Internets

, Marshall T. Rose, Prentice Hall  1991.

– contains installation and configuration instructions

– contains the SMC Enterprise MIB.

, Radia Perlman, Addison



1991.

FDDI Dual-Attached Intelligent Module User’s Guide Page 1-5

Chapter 1:

Introduction

1.7 GETTING HELP

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:

Phone [phone]
Internet mail [e-mail]
FTP ctron.com (134.141.197.25)

Login
Password

BBS [phone]

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:
For technical support, select

anonymous
your email address

http://www.cabletron.com/

Service and Support

.

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)

• The device history (i.e., have you returned the device before, is this a
recurring problem, etc.)

• Any previous Return Material Authorization (RMA) numbers

Page 1-6 FDDI Dual-Attached Intelligent Module User’s Guide

CHAPTER 2

CONNECTING TO THE NETWORK

The 3F00-01/3F55-01 can be installed in any slot, and more than one can
be installed in your ATX. Refer to the
how to unpack, power up, and check your ATX before continuing with
this chapter.

Instructions for installing or swapping an 3F00-01 or 3F55-01 are
included in Chapter 6,

Adding/Swapping Modules

ATX User Guide

2.1 CONFIGURATION OPTIONS

Both the 3F00-01 and the 3F55-01 permit the ATX to attach to the FDDI
ring as a dual-attached station using either multimode (3F00-01) or single
mode (3F55-01) fiber respectively. They both can also be configured with
an optional Optical Bypass Switch.

for instructions on

.

FDDI Dual-Attached Intelligent Module User’s Guide Page 2-1

Chapter 2:

Connecting to the Network

2.1.1 Dual-attached Station

A dual-attached station (DAS) is connected to both the primary and
secondary FDDI rings. This is the preferred configuration, since it
provides the full benefits of dual-ring operation, allowing the network to
continue to operate if a station or cable fails.

Figure 2-1 shows the ATX, with a 3F00-01 installed, connected as a DAS
to two other DASs in an FDDI network. (A and B indicate A port and B
port.) When D AS de vices are connected on an FDDI ring, A ports must be
connected to B ports, and B ports must be connected to A ports.

DAS

B

ABA

AB

FastNET ATX

FDDI MIC A FDDI MIC BOPTICAL BYPASS

NMS PORT

ACT

THRU

RING A RING B

POWER STATUS

ENGINE STATUS

TURBO STATUS

SUPPLY A

SUPPLY B

1.6 Gbps

POWER

POWER

ACT

RX

STATUS

WRAP

WRAP

TX

THRU

RESET

DAS

ATX

PACKET PROCESSING ENGINE

Figure 2-1 Dual-attached Configuration

Page 2-2 FDDI Dual-Attached Intelligent Module User’s Guide

Chapter 2: Connecting to the Network

2.1.2 Dual-homed Single-attached Station

Dual-homing is a method of connecting concentrators and stations that
permits an alternate or backup path to the dual ring in case the primary
connection fails.

The connection is normally made via dual-attached concentrators (DACs)
which are connected to both the primary and secondary FDDI rings.
Other FDDI stations or concentrators are connected to the DAC master
(M) ports.

Figure 2-2 shows the ATX, with a 3F00-01 installed, connected to the
master ports of two DACs.

Network

M

DAC 2

M

SAS SAS

M

DAC 1

M

M

SAS SAS

M

Port A Port B

FastNET ATX

NMS PORT

FDDI MIC A FDDI MIC BOPTICAL BYPASS

ACT

THRU

RING A RING B

ATX

POWER STATUS

ENGINE STATUS

TURBO STATUS

SUPPLY A

SUPPLY B

1.6 Gbps
RESET

POWER

POWER

ACT

RX

STATUS

WRAP

WRAP

TX

THRU

PACKET PROCESSING ENGINE

Figure 2-2 Dual-homed Single-attached Configuration

In this configuration, the ATX accesses the FDDI ring through port B and
DAC 2. FDDI standards for D ASs such as the ATX state that if the B port
cannot be used, the device will automatically use its A port. Therefore, if
DAC 2 fails, the ATX is still connected to the ring through port A
(DAC 1).

FDDI Dual-Attached Intelligent Module User’s Guide Page 2-3

Chapter 2: Connecting to the Network

2.1.3 Single-attached Station

A single-attached station (SAS) is an FDDI station that uses only one
connection (an S port) for connection to the FDDI ring.

Figure 2-3 shows the ATX, with a 3F00-01 installed, configured as an
SAS, connected to a master port of a dual-attached concentrator (DAC)
on the main FDDI ring.

Network

DAC

M

M

SAS SAS

FastNET ATX

FDDI MIC A FDDI MIC BOPTICAL BYPASS

NMS PORT

M

Port B

ACT

WRAP

THRU

RING A RING B

ACT

POWER STATUS

ENGINE STATUS

WRAP

THRU

TURBO STATUS

POWER

DAS

ATX

SUPPLY A

SUPPLY B

POWER

RX

STATUS

TX

1.6 Gbps
RESET

PACKET PROCESSING ENGINE

Figure 2-3 Single-attached Configuration

Page 2-4 FDDI Dual-Attached Intelligent Module User’s Guide

Chapter 2: Connecting to the Network

2.1.4 Optical Bypass Switch

An Optical Bypass Switch (OBS) may be used to provide added
protection when the ATX is configured as a DAS. If an OBS is connected
to the 3F00-01 or 3F55-01, and a failure occurs at the ATX, the OBS
automatically isolates the ATX from the rest of the network by
reconfiguring the FDDI dual rings as shown in Figure 2-4.

ATX

3F00-01

OBS

Through Mode
(Normal)

Figure 2-4 Optical Bypass Switch Operation

ATX

3F00-01

OBS

Bypass Mode

This avoids ring “wrapping” (automatic reconfiguration to isolate a f ault)
and ring re-initialization. In addition, an OBS makes it possible to
disconnect the ATX from the network without disrupting the FDDI rings.

2.2 LED POWER-UP SEQUENCE

Before connecting the 3F00-01 or 3F55-01 to the network, power on the
ATX and observe the automatic power-up diagnostics sequence of the
front panel LEDs to check for proper operation. Refer to the ATX User
Guide for instructions on how to power up the ATX.

Each of the modules in the ATX is tested in order, (from top to bottom of
the unit). The power-up sequence takes between 1 and 2 minutes,
depending on the ATX configuration.

FDDI Dual-Attached Intelligent Module User’s Guide Page 2-5