Cabletron Systems 42T, MicroMMAC 24T MICROMMAC-, MicroMMAC 44T MICROMMAC-, MICROMMAC-22T, MICROMMAC-24T User Manual

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MICROMMAC-22T/24T/42T/44T

STA CKABLE T OKEN RING

INTELLIGENT HUBS

USER’S GUIDE

NOTICE

per

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.

Inc. SPECTRUM, LANVIEW, and Remote LANVIEW are registered trademarks of Cabletron

Systems, Inc. IBM is a registered trademark of International Business Machines Corporation. DEC, VT200, and VT300 are trademarks of Digital Equipment Corporation. CompuServe is a trademark of Compuserve, Inc.

Printed On

Recycled Pa

iii

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 de vice 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.

VCCI NOTICE

This equipment is in the 1st Class Category (information equipment to be used in commercial and/or industrial areas) and conforms to the standards set by the Voluntary Control Council for Interference by Information Technology Equipment (VCCI) aimed at preventing radio interference in commercial and/or industrial areas.

Consequently, when used in a residential area or in an adjacent area thereto, radio interference may be caused to radios and TV receivers, etc.

NEED JAP ANESE GRAPHIC TEXT HERE BEFORE RELEASE

Read the instructions for correct handling.

NOTICE

CABLETRON SYSTEMS, INC. PROGRAM

LICENSE AGREEMENT

IMPORTANT: Before utilizing this product, carefully read this License Agreement. This document is an agreement between you, the end user, and Cabletron Systems, Inc.

(“Cabletron”) that sets forth your rights and obligations with respect to the Cabletron software program (the “Program”) contained in this package. The Program may be contained in ﬁrmware, chips or other media. BY UTILIZING THE ENCLOSED PRODUCT, YOU ARE AGREEING TO BECOME BOUND BY THE TERMS OF THIS AGREEMENT, WHICH INCLUDES THE LICENSE AND THE LIMITATION OF WARRANTY AND DISCLAIMER OF LIABILITY. IF YOU DO NOT AGREE TO THE TERMS OF THIS AGREEMENT , PR OMPTLY RETURN THE UNUSED PRODUCT TO THE PLACE OF PURCHASE FOR A FULL REFUND.

CABLETRON SOFTWARE PROGRAM LICENSE

1. LICENSE. this package subject to the terms and conditions of this License Agreement. You may not copy, reproduce or transmit any part of the Program except as permitted by the Copyright Act of the United States or as authorized in writing by Cabletron.

2. O

THER RESTRICTIONS. You may not reverse engineer, decompile, or disassemble

the Program.

APPLICABLE LAW. This License Agreement shall be interpreted and governed under the laws and in the state and federal courts of New Hampshire. You accept the personal jurisdiction and venue of the New Hampshire courts.

Y ou ha ve the right to use only the one (1) copy of the Program pro vided in

EXCLUSION OF WARRANTY AND DISCLAIMER

OF LIABILITY

1. EXCLUSION OF Cabletron in writing, Cabletron makes no warranty, expressed or implied, concerning the Program (including Its documentation and media).

WARRANTY. Except as may be speciﬁcally provided by

CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO YOU BY CABLETRON IN WRITING, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABLITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO THE PROGRAM, THE ACCOMPANYING WRITTEN MA TERIALS, AND ANY ACCOMPANYING HARDWARE.

NOTICE

2. NO LIABILITY FOR CONSEQ 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 DAMA GES, OR O THER 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 WARRANTEES IN SOME INSTANCES THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU.

UENTIAL DAMAGES. IN NO EVENT SHALL

UNITED STATES GOVERNMENT RESTRICTED

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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 03866

CONTENTS

CHAPTER 1 INTRODUCTION

1.1 CONTENTS OVERVIEW. . . . . . . . . . . . . . . . . . . . . . . . . .1-1

1.2 MicroMMAC-T OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.3 MicroMMAC-T FEATURES . . . . . . . . . . . . . . . . . . . . . . . .1-3

1.4 STACKABLE CAPABILITIES . . . . . . . . . . . . . . . . . . . . . . .1-8

1.5 BRIDGING/ROUTING CAPABILITIES. . . . . . . . . . . . . . . .1-9

1.5.1 SNA/WAN Integration. . . . . . . . . . . . . . . . . . . . . .1-10

1.6 REMOTE MANAGEMENT CAPABILITIES . . . . . . . . . . .1-10

1.7 TELNET CAPABILITIES . . . . . . . . . . . . . . . . . . . . . . . . .1-10

1.8 RECOMMENDED READING. . . . . . . . . . . . . . . . . . . . . .1-11

1.9 GETTING HELP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11

CHAPTER 2 REQUIREMENTS/SPECIFICATIONS

2.1 CABLE SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . .2-1

2.1.1 UTP Cable Speciﬁcations . . . . . . . . . . . . . . . . . . .2-2

2.1.2 STP Cable Speciﬁcations. . . . . . . . . . . . . . . . . . . .2-4

2.1.4 Single Mode Fiber Optic Cable Speciﬁcations. . . .2-7

2.2 CABLE RECOMMENDATIONS/TROUBLESHOOTING . .2-8

2.3 COM PORT SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . .2-9

2.4 TPIM SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . .2-10

2.5 GENERAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . .2-15

2.5.1 Power Supply Requirements . . . . . . . . . . . . . . . .2-16

2.5.2 Environmental Requirements. . . . . . . . . . . . . . . .2-16

2.5.3 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-16

2.5.4 Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-16

2.5.5 Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-17

CHAPTER 3 INSTALLATION

3.1 UNPACKING THE MicroMMAC-T . . . . . . . . . . . . . . . . . . .3-1

3.2 ATTACHING THE STRAIN RELIEF BRACKET . . . . . . . . .3-1

3.3 INSTALLING THE MicroMMAC-T . . . . . . . . . . . . . . . . . . .3-2

3.3.1 Rack-Mounting the MicroMMAC-T. . . . . . . . . . . . .3-2

3.3.2 Wall-Mounting the MicroMMAC-T . . . . . . . . . . . . .3-3

3.3.3 Free-Standing Installation . . . . . . . . . . . . . . . . . . .3-5

3.4 CONNECTING TO A POWER SOURCE. . . . . . . . . . . . . .3-5

vii

CONTENTS

3.5 RESETTING THE MICROMMAC-T. . . . . . . . . . . . . . . . . .3-5

3.6 SETTING THE RING SPEED . . . . . . . . . . . . . . . . . . . . . .3-6

3.7 SETTING THE NVRAM SWITCH . . . . . . . . . . . . . . . . . . .3-7

3.8 CONNECTING LOBE PORT CABLING . . . . . . . . . . . . . . 3-8

3.9 INSTALLING TPIM MODULES . . . . . . . . . . . . . . . . . . . . 3-12

3.9.1 Setting Phantom and RI/RO Switches. . . . . . . . .3-13

3.9.2 TPIM Installation . . . . . . . . . . . . . . . . . . . . . . . . .3-14

3.9.3 Connecting STP Segments . . . . . . . . . . . . . . . . .3-15

3.9.4 Connecting Twisted Pair Segments . . . . . . . . . . .3-16

3.9.5 Connecting Fiber Optic Link Segments . . . . . . . .3-17

3.10 CHECKING THE INSTALLATION . . . . . . . . . . . . . . . . . .3-19

CHAPTER 4 LOCAL MANAGEMENT

4.1 MANAGEMENT TERMINAL REQUIREMENTS . . . . . . . .4-1

4.1.1 Attaching the Management Terminal . . . . . . . . . . .4-2

4.1.2 Management Terminal Setup Parameters . . . . . . .4-2

4.1.3 Modem Cable Conﬁguration and Setup. . . . . . . . .4-3

4.2 ACCESSING LOCAL MANAGEMENT . . . . . . . . . . . . . . .4-4

4.2.1 Accessing Local Management via Telnet. . . . . . . .4-5

4.2.2 Accessing Local Management from a Modem. . . .4-6

4.3 USING LOCAL MANAGEMENT . . . . . . . . . . . . . . . . . . . .4-6

4.3.1 Working with Local Management Screens. . . . . . .4-7

4.3.2 The SYSTEM LEVEL Screen . . . . . . . . . . . . . . . .4-9

4.3.3 The SNMP COMMUNITY NAMES Screen . . . . .4-15

4.3.4 The SNMP TRAPS Screen . . . . . . . . . . . . . . . . .4-17

4.3.5 The RING SECURITY Screen. . . . . . . . . . . . . . .4-18

4.3.6 The DEVICE STATISTICS Screen. . . . . . . . . . . . 4-23

4.3.7 The CHASSIS STATUS VIEW Screen. . . . . . . . . 4-28

4.3.8 The COMPONENT STATUS Screen . . . . . . . . . .4-35

4.3.9 The MIB NAVIGATOR Screen . . . . . . . . . . . . . . .4-36

4.3.10 The FLASH DOWNLOAD Screen . . . . . . . . . . . . 4-40

CHAPTER 5 TROUBLESHOOTING

5.1 USING LANVIEW LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5.2 USING THE LCD DISPLAY . . . . . . . . . . . . . . . . . . . . . . . .5-2

5.2.1 Static System Messages . . . . . . . . . . . . . . . . . . . .5-3

5.2.2 Alarm Messages . . . . . . . . . . . . . . . . . . . . . . . . . .5-4

5.2.3 Unsaved Initialization Messages . . . . . . . . . . . . . . 5-5

viii

CONTENTS

5.2.4 Saved System Messages. . . . . . . . . . . . . . . . . . . .5-6

5.3 VIEWING POWER UP DIAGNOSTIC TESTS. . . . . . . . . .5-7

CHAPTER 1

INTRODUCTION

Welcome to the Cabletron Systems

-44T Stackable Token Ring Intelligent Hub User’s Guide

MicroMMAC-22T/-24T/-42T/

. This manual provides installation instructions, network requirements, reference information, and operating instructions for the MicroMMAC-T (Figure 1-1) family of stackable hubs. Installing the MicroMMAC-T requires familiarity with the physical layer components of Token Ring (IEEE

802.5) data communications networks.

NOTE

: Unless otherwise speciﬁed, this manual uses the term MicroMMAC-T to collectively refer to the MicroMMAC-22T, the MicroMMAC-24T, the MicroMMAC-42T, and the MicroMMAC-44T.

MicroMMAC-24T

LCD

16M4M

RESET

DISPLAY

SPEED

TOKEN RING HUB

SUPPORTING 100 OHM UTP CABLE

WITH

CPU

16 Mb/s

COM 1COM 2

LANVIEW®

ACT

MGMT

TPIM

Ring Out

Slot

TPIM

24 23 22 21 20 19

12 11 10 9 8 7

18 17 16 15 14 13

6 5 4 3 2 1

Figure 1-1. The MicroMMAC-T

1.1 CONTENTS OVERVIEW

This manual contains the following information: Chapter 1,

describes features of the MicroMMAC-T and its add-on components. It also lists sources where more information on Token Ring network implementation can be found.

Chapter 2, network guidelines, and MicroMMAC-T operating speciﬁcations.

Chapter 3, and discusses network connections using various media types. This chapter includes instructions for setting the Ring Speed Switch, the Reset Switch, the NVRAM Switch, and the TPIM Phantom Switch. It also

Introduction

, outlines the contents of this manual and

Requirements/Speciﬁcations

Installation,

contains MicroMMAC-T installation instructions

, describes cabling requirements,

1-1

INTRODUCTION

describes how to install a TPIM and concludes with installation check-out instructions.

Chapter 4,

Local Management

, explains how to set up and use a

management terminal and a modem to access Local Management. Chapter 5,

Troubleshooting

, explains how to monitor the operation performance of the MicroMMAC-T using LANVIEW® LEDs and LCD’ s. It also explains how to access POWER UP diagnostic test information.

1.2 MicroMMAC-T OVERVIEW

The MicroMMAC-T is an intelligent, stackable Multi-Media Access Center providing connectivity and SNMP management for up to 255 Token Ring users (Local Management for up to 120 Token Ring users) in remote ofﬁce environments. The MicroMMAC-T can be used in conjunction with Cabletron’s STH HubSTACK series of stackable non-intelligent hubs.

Figure 1-2 illustrates a typical MicroMMAC-T conﬁguration scenario. Attachable Bridge/Routing Interface Modules (BRIMs), incorporated as seamless entities within the MicroMMAC-T , pro vide connectivity not only to standard Token Rings but also to Ethernet, FDDI, ATM, and WAN environments, depending upon the BRIM types used.

T oken Ring Port Interface Modules (TPIMs) attachable at the Ring In/Ring Out (RI/RO) ports pro vide connectivity and expanded trunk connections to a range of Token Ring media: Unshielded Twisted Pair (UTP), Shielded Twisted Pair (STP), and Fiber.

By installing Cabletron’s MicroSNAC daughterboard in the MicroMMAC-T, you can consolidate SNA/SDLC, BSC, LAN, and WAN connectivity into a single unit.

Telnet support provides easy access to Local Management tools from any TCP/IP based node on the network.

The MicroMMAC-T complies with the IEEE 802.5 standard and is fully IBM Token Ring compatible. The remainder of this chapter discusses MicroMMAC-T features in greater detail.

1-2

INTRODUCTION

TOKEN RING

Telnet

UTP

WORKSTATION

Figure 1-2. Typical MicroMMAC-T Conﬁguration Scenario

SDLC

All MicroMMAC-Ts are functionally and physically identical except for the number and type of their T runk Connection Unit (TCU) lobe ports. The following MicroMMAC-T conﬁgurations are available:

MicroMMAC-22T

•

: twelve active RJ45 TCU lobe ports that support

category 3, 4, and 5 UTP cabling.

•

MicroMMAC 24T

: twenty-four active RJ45 TCU lobe ports that

support category 3, 4, and 5 UTP cabling.

•

MicroMMAC-42T

: twelve active RJ45 TCU lobe ports that support

IBM Type 1, 2, 6, and 9 STP cabling.

•

MicroMMAC-44T

: twenty-four active RJ45 TCU lobe ports that

support IBM Type 1, 2, 6, and 9 STP cabling.

1.3 MicroMMAC-T FEATURES

NOTE

upgrade kit, the MicroSNAC device, BRIMs, TPIMs, interface cables, and other accessories for the MicroMMAC-T.

: Call your Cabletron Sales representative to order the 12-port

1-3

INTRODUCTION

Active TCU Ports

The active TCU ports regenerate, reshape, and ﬁlter the incoming signal, permitting UTP lobe cable lengths of up to lengths up to

150 meters

at 16 Mbps ring speed. The MicroMMAC-22T

120 meters

and STP lobe cable

and the MicroMMAC-42T can be upgraded in the ﬁeld using the Cabletron UTP and STP 12-port upgrade kits.

Cable Signal Polarity

Differential Manchester encoding is used for each concentrator module TCU port. This permits passing data regardless of receive link polarity.

NOTE

: The MicroMMAC-T is not affected by the reversed polarity condition. If, however, such a condition is discovered, the segment should be removed fr om the network and wired corr ectly to avoid problems during future network operations. Refer to Section 3.8 for cable pinouts speciﬁcations

Speed Fault Protection

If a station attempts to insert into a ring port at a different speed from the one set on the MicroMMAC-T, that port is automatically bypassed to prevent the ring from beaconing. The Lobe Port Status LED blinks red (for more information, see Section 5.1, USING LANVIEW LEDs) to indicate that the port with the speed fault is being bypassed.

Local Management

Local Management provides you with the ability to manage the MicroMMAC-T and all of its attached segments, including most BRIMs and the MicroSNAC device. The CR BRIM-W/T and the MicroSNAC provide their own conﬁguration ﬁrmware.

Access Local Management by connecting an actual or emulated Digital Equipment Corporation VT100™ series terminal to the MicroMMA C-T’ s COM 1 port or the COM 2 port. To view diagnostic test information from a display terminal, use the COM 2 port.

Token Ring Port Interface Modules (TPIMs)

TPIMs are modular connector cards used for expanding trunk connections to a range of Token Ring media. TPIMs have embedded repeaters that

1-4

INTRODUCTION

re-time all data. Cabletron offers a variety of TPIMs for RI/RO trunk connections as shown in Table 1-1.

Table 1-1. TPIMs

TPIM Media T ype Connector

TPIM-T1 Shielded Twisted Pair DB9 TPIM-T2 Unshielded Twisted Pair RJ45 TPIM-T4 Shielded Twisted Pair RJ45 TPIM-F2 Multimode Fiber Optic ST TPIM-F3 Single mode Fiber Optic ST

Ring Speed Switch

Use the Ring Speed Switch to select either 4 or 16 Mbps ring speed.

Flash EEPROM

The ﬁrmware image on the MicroMMAC-T can be upgraded by Flash EEPROM downloads via Cabletron System’s Remote LANVIEW/Windows version 2.3 or later, or via any server supporting BOOTP or TFTP protocols.

LANVIEW LEDs

Cabletron Systems’ LANVIEW LEDs, located on the face of the MicroMMAC-T, provide an effective monitoring and troubleshooting tool to help diagnose power failures, RI/R O status, cable faults, ring speed, link problems, and network activity. See Section 5.1 for information about using LEDs.

Cabletron’s Distributed LAN Monitor Mode

To manage a network that includes multiple subnets, remote network management stations need to query multiple management devices, increasing the data trafﬁc on the network. Network managers can reduce the amount of management related trafﬁc by setting the MicroMMAC-T into Distributed LAN Monitor mode via a remote management package. The MicroMMAC-T in DLM mode will collect management data from the

1-5

INTRODUCTION

numerous management devices and serve as their management data representative. The network management station then has to query only one management device, the MicroMMAC-T in DLM mode, to access management data for all management devices on the network.

Consult your network manager for DLM setup.

COM Port Applications

Both of the front panel COM ports are factory-conﬁgured to support Local Management connections. Select among conﬁguration options for Local Management, Uninterruptible Power Supplies (UPS), the Serial Line Internet Protocol (SLIP), and modems.

LCD and LCD Display Button

MicroMMAC-T’s front panel LCD used in conjunction with the LCD display button provides you with comprehensi ve system-le vel information such as power-up diagnostics, FLASH image re vision lev els, IP addresses, and error alerts. See Section 5.2 for more information.

Reset Button

The Reset button on the front panel initializes the processor when pressed. The information contained in NVRAM is retained after initialization. See Section 3.5 for more information.

MIB Support

The MicroMMAC-T provides access to the following Management Information Bases:

Standard MIBs

• MIB-2 (RFC 1231)

• IEEE RMON MIB (RFC 1271)

• RMON Extensions for Token Ring (RFC 1513) Cabletron Enterprise MIBs

• Download

• MIB-II Extensions

1-6

INTRODUCTION

• Token Ring FNB (Flexible Network Bus)

• DOT 5 Logical and Physical

• UPS (Uninterruptible Power Supply)

• Device

• DLM (Distributed LAN Monitor)

• PIC MIB (Product Information Chip MIB)

• Chassis MIB

RMON MIB Support

The MicroMMAC-T supports the RMON MIB RFC 1271/1513 Token Ring Extensions shown in Table 1-2.

Table 1-2. RMON MIB RFC 1271/1513 Support

Group Subgroup Section

Statistics rmon 1 History rmon 2

Alarm rmon 3 Host rmon 4

Token Ring ML Stats Table Token Ring P Stats Table History Control Table Token Ring ML History Table Token Ring P History Table Alarm Table alarm 1

Host Control Table Host Table Host Time Table

statistics 2 statistics 3 history 1 history 3 history 4

hosts 1 hosts 2

hosts 3 HostTopN rmon 5 Matrix rmon 6

HostTopN Control Table HostTopN T able Matrix Control Table Matrix SD Table Matrix DS Table

hostTopN 1

hostTopN 2

Matrix 1

Matrix 2

Matrix 3

1-7

INTRODUCTION

Table 1-2. RMON MIB RFC 1271/1513 Support (Cont.)

Group Subgroup Section

Event rmon 9 Token Ring rmon 10

Event Table Log Table Ring Station Control Table Ring Station Table Ring Station Order Table Ring Station Conﬁg Control Table Ring Station Conﬁg Table Source Routing Stats Table

event 1 event 2 Token Ring 1 Token Ring 2 Token Ring 3 Token Ring 4 Token Ring 5 Token Ring 6

1.4 STACKABLE CAPABILITIES

The MicroMMAC-T can be stacked with up to four HubSTACK STH series non-intelligent hubs as shown in Figure 1-3. Four connectors are available on the back panel of the MicroMMAC-T for connecting STH 12/24 type non-intelligent hubs. The MicroMMAC-T provides complete management, including full packet and error statistics for the entire stack, individual device, or individual port.

It is not necessary to power-of f the MicroMMA C-T to add or remov e hubs from the stack.

1-8

REAR VIEW MicroMMAC Managing 4 Non-Intelligent Hubs

HubSTACK STH-24

RESERVED

HubSTACK STH-24

RESERVED

HubSTACK STH-24

RESERVED

HubSTACK STH-24

RESERVED

STACK

INTRODUCTION

MicroMMAC-24T

TOKEN RING HUB

WITH

LANVIEW®

BRIM Slot

STACK5STACK4STACK3STACK2

Figure 1-3. Typical Stackable Conﬁguration

NOTE

: Token Ring HubSTACK Interface cables, which are used to connect between the MicroMMAC-T and stacked STH hubs, are not included with the MicroMMAC-T.

1.5 BRIDGING/ROUTING CAPABILITIES

A slot on the back panel of the unit provides installation access for BRIMs to the hub. MicroMMA C-T management systems treat the installed BRIM and the hub as a single entity. Cabletron offers the BRIMs listed in Table 1-3.

1-9

INTRODUCTION

Table 1-3. BRIMs

BRIM Description

BRIM-E6 Ethernet Connection BRIM-W6 Wide Area Network (Full or Fractional T1; 56k DDS) BRIM-A6 Asynchronous Transfer Mode Connection BRIM-T6 Token Ring Connection CR BRIM-W/T Cisco WAN BRIM for Token Ring BRIM-FO Fiber Distributed Data Interface Connection

1.5.1 SNA/WAN Integration

The MicroSNA C add-on daughterboard pro vides two ports, both of which can be used to provide con version from SNA/SDLC or BSC links to LLC2. The MicroSNAC can operate in a converter mode or as a WAN concentrator.

1.6 REMOTE MANAGEMENT CAPABILITIES

The MicroMMAC-T may be managed through any Simple Network Management Protocol (SNMP) software. Cabletron Systems offers the following remote management packages:

• Cabletron Systems SPECTRUM

• Cabletron Systems Remote LANVIEW®/Windows™

• Cabletron Systems Remote SPECTRUM Applications

Portable Management

1.7 TELNET CAPABILITIES

The MicroMMAC -T supports Telnet, which allows any TCP/IP based node on the network to establish a Local Management session with the

1-10

INTRODUCTION

module. This feature complements the remote SNMP management and allows for quick hub conﬁguration changes or checks.

1.8 RECOMMENDED READING

The following publications provide more information on Token Ring network implementation.

Local Area Networks, Token Ring Access Method

, IEEE Standard 802.5

(1989)

Commercial Building Wiring Standard, EIA/TIA-568 LAN Troubleshooting Handbook

, Mark Miller (1989, M&T Publishing)

1.9 GETTING HELP

For additional support related to the Cabletron Systems MicroMMAC-T, or for any questions, comments, or suggestions concerning this manual, contact Cabletron Systems Technical Support:

By phone. . . . . . . . . . . . . . . . . . (603) 332-9400

Monday-Friday; 8am - 8pm EST

By CompuServe

By Internet mail . . . . . . . . . . . . support@ctron.com

. . . . . . . . . . . GO CTRON from any ! prompt

By BBS. . . . . . . . . . . . . . . . . . . (603) 337-3750

By mail . . . . . . . . . . . . . . . . . . . Cabletron Systems, Inc.

P.O. Box 5005 Rochester, NH 03866-5005

1-11

CHAPTER 2

REQUIREMENTS/SPECIFICATIONS

Read this chapter prior to installing the MicroMMAC-T. It contains operating speciﬁcations and requirements for power and cabling. To obtain satisfactory performance from this equipment, networks must meet the requirements and conditions speciﬁed in this chapter. Failure to follow these guidelines may result in poor network performance.

2.1 CABLE SPECIFICATIONS

Token Ring architecture provides for a set of Trunk Coupling Units (TCUs) connected by trunk cabling. To extend the trunk cabling, install TPIMs into the MicroMMAC-T’s RI/RO ports. TPIMs have embedded repeaters and provide trunk connections for UTP, STP, Multimode Fiber, and Single Mode Fiber cabling.

Attach stations to the TCU lobe ports with lobe cabling. Figure 2-1 shows a typical ports to cables conﬁguration.

Ring Out TPIM

TOKEN RING HUB WITH LANVIEW®

MicroMMAC-24T

SUPPORTING 100 OHM STP CABLE

18 17 16 15 14 13

24 23 22 21 20 19

6 5 4 3 2 1

12 11 10 9 8 7

TCU Lobe Ports

Ring In TPIM

18 17 16 15 14 13

ACT MGMT

24 23 22 21 20 19

6 5 4 3 2 1

12 11 10 9 8 7

RO RI

Trunk Cabling

Token Ring Station

DISPLAY

16M4M

RESET

DISPLAY

SPEED

COM 1COM 2

Lobe Cabling

TOKEN RING HUB WITH LANVIEW®

MicroMMAC-24T

SUPPORTING 100 OHM STP CABLE

DISPLAY

16M4M

RESET

DISPLAY

SPEED

ACT

CPU

MGMT

16 Mb/s

CPU

16 Mb/s

COM 1COM 2

Figure 2-1. MicroMMAC-T Ports/Cables

2-1

REQUIREMENTS/SPECIFICATIONS

2.1.1 UTP Cable Speciﬁcations

The MicroMMAC-22T and MicroMMAC-24T lobe ports and the TPIM-T2 support voice grade Unshielded Twisted Pair (UTP) cable, as described in speciﬁcations for EIA/TIA TSB 568 and IBM Type 3 cable.

UTP consists of four pairs of 24 AWG solid wire for data or voice communication and is typically used to wire cable runs within building walls. In some installations, existing UTP building wiring can be used for Token Ring cabling. UTP cable must conform to the limits shown in Table 2-1.

WARNING

: DO NOT connect UTP cabling to any non-Token Ring network conductors (telephone, etc.) or ground. If in doubt, test wiring before using. The voltages used in UTP telephone cir cuits present a shock hazard and can damage Token Ring equipment when connected to Token Ring cabling.

The increased popularity and cost advantages of UTP cable have driven reﬁnements in UTP cable design. Better grades of UTP cable, known as supergrade or level 4, provide improved transmission characteristics and may allow operation at 16 Mbps on longer lobe cables.

Attenuation and Impedance

The values listed in Figure 2-1 include the maximum attenuation of the cables, connectors, patch panels, and reﬂection losses due to impedance mismatches in the segment.

Table 2-1. UTP Voice Grade and Category 3 Speciﬁcations

Frequency Impedance Attenuation

1 MHz 100Ω ±15% <26 dB/km (8 dB/1000 ft) 4 MHz 100Ω ±15% <56 dB/km (16 dB/1000 ft) 10 MHz 100Ω ±15% <98 dB/km (30 dB/1000 ft) 16 MHz 100Ω ±15% <131 dB/km (40 dB/1000 ft)

2-2

REQUIREMENTS/SPECIFICATIONS

Maximum Lobe Lengths

Lobe length is the physical length of the cable connecting a station to its TCU port at the MicroMMAC-T. Table 2-2 lists the maximum lobe cable length for ring speeds of 4 and 16 Mbps. The values listed refer to total lengths made up of UTP cable only.

Table 2-2. UTP Maximum Lobe Lengths

UTP Cable Type Maximum Lobe Length

4 Mbps 16 Mbps

Category 3 200 meters 100 meters

(656 feet) (328 feet)

Category 4 200 meters 100 meters

(656 feet) (328 feet)

Category 5 250 meters 120 meters

(820 feet) (394 feet)

Type 3 Media Filters

A Type 3 Media Filter is required when connecting a UTP lobe segment from a MicroMMAC-22T or MicroMMAC-24T to a station supporting STP cabling. Cabletron Systems offers the follo wing Type 3 Media Filters:

• TRMF , RJ45 (UTP) connector to 10-inch DB9 (STP) cable with

LANVIEW

• TRMF-2, RJ45 (UTP) connector to DB9 (STP) connector

Maximum Number of Stations

When UTP lobe cabling is used in any ring segment, the number of ring stations supported by the MicroMMAC-T is limited to 150, regardless of the operating ring speed.

2-3

REQUIREMENTS/SPECIFICATIONS

2.1.2 STP Cable Speciﬁcations

MicroMMACs 42T and 44T and TPIMs T1 and T4 support IBM Type 1, 2, 6, and 9 STP cabling as described below:

• IBM T ype 1: Two STP lengths of 22 AWG solid wire for data. Used

for the longest cable runs within building walls of buildings.

• IBM T ype 2: Similar to Type 1 data cable, but having four additional

UTP lengths of 22 A WG solid wire carried outside of the shield casing. Typically used for voice communication and often used to wire cable runs within the walls of buildings.

• IBM T ype 6: Two STP lengths of 26 AWG stranded wire for data.

Used in patch panels or to connect devices to/from wall jacks. Attenuation for Type 6 cable is 3/2 x Type 1 cable (66 m of Type 6 =100 meters of Type 1).

• IBM T ype 9: Similar to Type 1, but uses 26 AWG solid wire.

Attenuation for Type 9 cable is 3/2 x Type 1 cable (66 m of Type 9 = 100 meters of Type 1).

Attenuation and Impedance

The attenuation values shown in Table 2-3 include the attenuation of the cables, connectors, patch panels, and reﬂection losses due to impedance mismatches in the segment

Table 2-3. STP Cable Speciﬁcations

Types Frequency Impedance Attenuation

1 & 2 4 MHz

16 MHz

6 & 9 4 MHz

16 MHz

150Ω + 15% 150Ω + 15% 150Ω + 15% 150Ω + 15%

<22 dB/km (6.7 db/1000 ft.) <45 dB/km (13.7 db/1000 ft.) <33 dB/km (10 db/1000 ft.) <66 dB/km (20 db/1000 ft.)

Maximum Lobe Lengths

The lobe length is the physical length of the cable connecting a station to its TCU port at the MicroMMAC-T. Table 2-4 lists the maximum lobe

2-4

REQUIREMENTS/SPECIFICATIONS

cable length for ring speeds of 4 and 16 Mbps. The cable lengths listed in Table 2-4 refer to total lengths made up of STP cable only

Table 2-4. STP Maximum Lobe Lengths

STP Cable Type Ring Speed

4 Mbps 16 Mbps

IBM Types 1 & 2 300 meters 150 meters

(984 feet) (492 feet)

IBM Types 6 & 9 (only for station to wall jack and patch panels)

30 meters 30 meters (99 feet) (99 feet)

Maximum T runk Lengths

The maximum trunk cable length between the MicroMMAC-T and other active devices is equal to the maximum drive distance as shown in Table 2-5. For passive devices, the combined length of twice the longest trunk cable, plus the longest lobe cable attached to the passive ring segment cannot exceed the Maximum Drive Distance.

Table 2-5. STP Maximum Drive Distance

STP Cable Type Ring Speed

4 Mbps 16 Mbps

IBM Types 1 & 2 770 meters 346 meters

IBM Types 6 & 9 513 meters 230 meters

Maximum Number of Stations

If only STP lobe cabling is used throughout the ring, the MicroMMAC-T supports up to 255 ring stations, regardless of ring speed.

(2525 feet) (1138 feet)

(1683 feet) (755 feet)

2-5

REQUIREMENTS/SPECIFICATIONS

Mixed Cable Types

If multiple cable types exist in network, compensations must be made for the different cable attenuations. Type 6 and T ype 9 cables can run only 2/3 the distance of T ype 1. Therefore 10 meters of T ype 1 ≈ 6.6 meters of T ypes 6 and 9.

2.1.3 Multimode Fiber Optic Cable Speciﬁcations

Table 2-6 shows speciﬁcations for the Multimode Fiber Optic Cable supported by TPIM-F2

Table 2-6. Multimode Fiber Optic Cable Speciﬁcations

Cable Type Attenuation Maximum Drive Distance

50/125 µm 13.0 dB or less

62.5/125 µm 16.0 dB or less

The maximum allowable ﬁber optic cable length is 2 km (2187.2 yards). However, IEEE

100/140 µm 19.0 dB or less

802.5 speciﬁcations allow for a maximum of 1 km (1093.6 yards).

Maximum T runk Lengths

The maximum trunk cable length between the MicroMMAC-T and other active devices is equal to the maximum drive distance as shown in Table 2-6. For passive devices, the combined length of twice the longest trunk cable, plus the longest lobe cable attached to the passive ring segment, must not exceed the Maximum Drive Distance Trunk Length.

Attenuation

Fiber optic cable must be tested with an attenuation test set adjusted for an 850 nm wavelength. This test ensures that a cable’s signal loss is within acceptable limits. Table 2-6 shows the attenuation for each Multimode cable type.

2-6

REQUIREMENTS/SPECIFICATIONS

Fiber Optic Budget

The ﬁber optic delay budget, which determines the ﬁber optic cable’s maximum length, should be calculated and taken into consideration in the network design stage. Fiber optic delay budget is determined by summing the optical signal loss due to ﬁber optic cable attenuation, in-line splices, and ﬁber optic connectors.

2.1.4 Single Mode Fiber Optic Cable Speciﬁcations

Table 2-7 shows speciﬁcations for the Single Mode Fiber Optic Cable supported by TPIM-F3.

Table 2-7. Single Mode Fiber Optic Cable Speciﬁcations

Cable Type Attenuation Maximum Drive Distance

8/125-12/125 µm 10.0 dB or less The max. allowable ﬁber optic

cable length is 10 km (10936 yards). However, IEEE 802.5 specs allow for a max. of 1 km (1093.6 yards).

Maximum T runk Lengths

The maximum trunk cable length between the MicroMMAC-T and other active devices is equal to the Maximum Drive Distance as shown in Table 2-7. For passive devices, the combined length of twice the longest trunk cable plus the longest lobe cable attached to the passive ring se gment must not exceed the Maximum Drive Distance Trunk Length.

Attenuation

Fiber optic cable must be tested with an attenuation test set adjusted for a 1300 nm wavelength. This test ensures that the cable’ s signal loss is within an acceptable range of 10 dB or less for any giv en single mode ﬁber optic link.

2-7

REQUIREMENTS/SPECIFICATIONS

Fiber Optic Budget

2.2 CABLE RECOMMENDATIONS/TROUBLESHOOTING

The following sections describe common cable problems and recommendations for correcting them.

Crosstalk

Crosstalk is interference caused by signal coupling between different cable pairs contained within a multi-pair cable bundle. Multi-pair cables should not be used for UTP lobe cabling. UTP lobe cabling should be dedicated to carrying T oken Ring traf ﬁc. A void mixing T oken Ring signals with other applications (voice, etc.) within the same cable.

Noise

Noise can be caused by crosstalk or externally imposed impulses. If noise-induced errors are suspected, ensure that the electrical wiring in the area is properly wired and grounded and/or try re-routing cabling away from potential noise sources (motors, switching equipment, ﬂuorescent lighting, high amperage equipment).

Temperature

The attenuation of PVC-insulated cable varies signiﬁcantly with temperature. Check the cable manufacturer’ s speciﬁcations. Plenum-rated cables are strongly recommended in areas where temperatures exceed 40˚C. Under such conditions, plenum-rated cables ensure that cable attenuation remains within speciﬁcations.

2-8

REQUIREMENTS/SPECIFICATIONS

Other Considerations

In addition to complying with the preceding cable speciﬁcations, the following recommendations should be followed to minimize errors and obtain optimum performance from the network:

• UTP cabling should be free of splices, stubs, or bridged taps.

• Maintain a two punch-down block limit between TCU ports and wall outlets.

• Properly ground metal troughs, ducts, etc. carrying Token Ring signals.

• Avoid routing Token Ring signals near copper cables that exit a building or are susceptible to lightning strikes and power surges.

• UTP cables containing Token Ring signals should not be simultaneously used for applications which may impress high voltages (greater that 5 volts) with sharp rise or fall times. The noise coupling from such signals could directly cause errors on the Token Ring network.

• Lobe lengths between TCU ports and connected devices should not exceed 100 meters of 22 to 24 AWG wire.

• Wherever possible, use dedicated UTP cable for Token Ring signals.

2.3 COM PORT SPECIFICATIONS

The RJ45 COM 1 and COM 2 ports (Figure 2-2) support Local Management applications. A description of COM port applications is listed below:

MicroMMAC-24T

16M4M

DISPLAY

SPEED

RESET

COM 2

TOKEN RING HUB

SUPPORTING 100 OHM UTP CABLE

COM 1

WITH

LANVIEW®

Figure 2-2. COM 1/COM 2 Ports

2-9

REQUIREMENTS/SPECIFICATIONS

Local Management

Both COM 1 and COM 2 ports are factory-conﬁgured to support Local Management access by an actual or emulated Digital Equipment Corporation VT 100™ terminal.

Booting/Diagnostics

Terminal display of POWER UP booting/diagnostic tests available only when terminal is connected to COM 2 (for information about Boot sequences, see Section 5.3 ).

UPS

COM 2 supports Uninterruptible Power Supply (American Power Conversion only).

SLIP

Both COM ports support Serial Line Internet Protocol (SLIP).

Modem

Both COM ports support modem connection.

2.4 TPIM SPECIFICATIONS

TPIMs provide Ring In/Ring Out (RI/R O) connections that can extend the network through a variety of media. Each TPIM has an embedded repeater that re-times all data.

The LNK (Link) LED on each TPIM provides the following information:

• Green - RI or RO active

• Red (TPIM-T1/T2/T4 only) - No Link (Autowrapped)

• Off - No Link (Wrapped or Disabled)

TPIM-T1

TPIM-T1 provides a female DB9 connector that supports STP cabling. Figure 2-3 shows TPIM-T1 pinouts for Ring Out and Ring In applications.

2-10

REQUIREMENTS/SPECIFICATIONS

5 4 3 2 1

9 8 7 6

LNK

TPIM-T1

RING OUT

1. Transmit +

2. Ground

3. +5V at 250 mA

4. Ground

5. Receive -

6. Transmit -

7. Ground

8. Ground

9. Receive +

RING IN

1. Receive +

2. Ground

3. +5V at 250 mA

4. Ground

5. Transmit -

6. Receive -

7. Ground

8. Ground

9. Transmit +

Figure 2-3. TPIM-T1 Pinouts

TPIM-T2

TPIM-T2 provides an RJ45 connector that supports UTP cabling. Figure 2-4 shows pinouts for Ring Out and Ring In applications.

1 2 3 4 5 6 7 8

LNK

TPIM-T2

RING OUT

1. Not Used

2. Not Used

3. Receive -

4. Transmit +

5. Transmit -

6. Receive +

7. Not Used

8. Not Used

RING IN

1. Not Used

2. Not Used

3. Transmit -

4. Receive +

5. Receive -

6. Transmit +

7. Not Used

8. Not Used

Figure 2-4. TPIM-T2 Pinouts

TPIM-T4

TPIM-T4 is an RJ45 connector that supports STP cabling. Figure 2-5 shows pinouts for Ring Out and Ring In applications.

2-11

REQUIREMENTS/SPECIFICATIONS

1 2 3 4 5 6 7 8

RING OUT

1. Not Used

2. Not Used

3. Receive -

4. Transmit +

5. Transmit -

6. Receive +

7. Not Used

8. Not Used

RING IN

1. Not Used

2. Not Used

3. Transmit -

4. Receive +

5. Receive -

6. Transmit +

7. Not Used

8. Not Used

LNK

TPIM-T4

Figure 2-5. TPIM-T4 Pinouts

TPIM-F2

TPIM-F2, shown in Figure 2-6, provides an ST connector that supports Multimode ﬁber Optic cabling.

LNK

TPIM-F2

Figure 2-6. TPIM-F2

NOTE: Transmitter power and receive sensitivity levels, shown in Table 2-8, are Peak Power Levels after optical overshoot. A Peak Power Meter must be used to correctly compare the values given to those measured on any particular port. If power levels are being measured with an Average Power Meter, then 3 dBm must be added to the measurement to correctly compare those measured values to the values listed (i.e. -30.5 dBm peak=-33.5 dBm average).

2-12

REQUIREMENTS/SPECIFICATIONS

Table 2-8. TPIM-F2 Speciﬁcations.

Parameter

Receive

Typical

V alue

Worst Case

-30.5 dBm -28.0 dBm — —

Worst Case Budget

Typical Budget

Sensitivity Peak Input

-7.6 dBm -8.2 dBm — —

Power Transmitter Power: 50/125 µm -13.0 dBm -15.0 dBm 13.0 dB 17.5 dB

62.5/125 µm -10.0 dBm -12.0 dBm 16.0 dB 20.5 dB 100/140 µm -7.0 dBm -9.0 dBm 19.0 dB 23.5 dB

Error Rate: Better than 10

-10

TPIM-F3

TPIM-F3, shown in Figure 2-7, is an ST connector that supports Single Mode ﬁber Optic cabling.

LNK

TPIM-F3

Figure 2-7. The TPIM-F3

Table 2-9. TPIM-F3 Speciﬁcations

Parameter Typical Minimum Maximum

Transmitter

1300 nm 1270 nm 1330 nm

Peak W a v e Length Spectral Width 60 nm – 100 nm Rise Time 3.0 nsec 2.7 nsec 5.0 nsec

2-13

REQUIREMENTS/SPECIFICATIONS

Table 2-9. TPIM-F3 Speciﬁcations

Parameter Typical Minimum Maximum

Fall Time 2.5 nsec 2.2 nsec 5.0 nsec Duty Cycle 50.1% 49.6% 50.7%

Bit Error Rate: Better than 10

-10

NOTE: Transmitter Power decreases as temperatures rise and increases as temperatures fall. Use the Output Power Coefﬁcient to calculate increased or decreased power output for an operating environment. For

example, the typical power output at 25 For a 4

C temperature increase, multiply the typical coefﬁcient

C is -16.4 dBm.

(-0.15 dBm) by four and add the result to typical output power (4 x -0.15 dBm + -16.4 = -17.0).

Maximum Sensitivity (-36.0)

Receive

Sensitivity

Maximum

Receive

Input Power

Typical Sensitivity (-31.0) Minimum Sensitivity (-30.0)

Minimum Receive Input (-9.72)

Typical Receive Input (-7.5) Maximum Receive Input (-6.99)

Transmitter Power*

(At 25°C into

8.3/125µm fiber)

dBm

* Transmit Power Typical Power Minimum Power Maximum Power Coefficient (See Note Below)-0.15dBm/ °C  -0.12 dBm/ °C-0.18 dBm/ °

-40 -35 -30 -25 -20 -15 -10 -5 0

Less Power

NOTE: The transmitter power levels provided above are Peak Power Levels after optical overshoot. Use a Peak Power Meter to correctly compare the values given to those measured on any particular port.

When measuring power levels with an Average Power Meter, add 3 dBm

2-14

Maximum Transmit Power (-12.0)

Typical Transmit Power (-15.5)

Minimum Transmit Power (-21.0)

More Power

REQUIREMENTS/SPECIFICATIONS

to the average power measurement to correctly compare the average power values measured to the values listed above (i.e., -33.5 dBm average + 3 dB = -30.5 dBm peak).

2.5 GENERAL SPECIFICATIONS

Cabletron Systems reserves the right to change the following operating speciﬁcations at any time without notice:

• Data Buffer Memory (RAM): 8 MB (Upgradeable)

• Internal Processor: Intel 80C960CF at 24 MHz

• Controller: Texas Instruments TMS380C26

• Static RAM: 128 KB with battery back-up

• EPROM: 128 KB

• FLASH MEMORY: 2 MB (Upgradeable)

2.5.1 Power Supply Requirements

NOTE: The MicroMMAC-T has a universal power supply which will accept input power between 85 and 264 VAC, 47-63 Hz.

The power supply has two outputs of +5 volts and +12 volts. Maximum output power is 125 watts and the minimum efﬁciency is 65% under all conditions of line at full load. The minimum and maximum load current from each output is shown below.

Table 2-10.

Output Min. Load Max. Load Max Power

+ 5 Volts 1.00 Amps 15 Amps 75 Watts +12 Volts 0.15 Amps 4 Amps 48 Watts

2.5.2 Environmental Requirements

Operating Temperature: +5° to +50°C

2-15

REQUIREMENTS/SPECIFICATIONS

Non-operating Temperature: -30° to +90°C Operating Humidity: 5 to 95% (non-condensing)

2.5.3 Safety

This unit meets the safety requirements of UL 1950, CSA C22.2 No. 950 and EN 60950; the EMI requirements of FCC Class A and EN 55022 Class A; and the EMC requirements of EN 50082-1.

WARNING: It is the responsibility of the system vendor to ensur e that the total system, including the MicroMMAC-T, meets allowed limits of conducted and radiated emissions.

2.5.4 Physical

Dimensions:

2.8H x 17.0W x 13.5D inches

(7.2H x 43.6W x 34.6D cm)

Weight:

Unit: 7 pounds Shipping: 11 pounds

2.5.5 Service

MTBF >944,197 hours projected MTTR <0.5 hour

2-16

CHAPTER 3

INSTALLATION

This chapter outlines MicroMMAC-T installation and netw ork connection procedures. Be sure that the network meets the guidelines and requirements outlined in Chapter 2, Requirements/Speciﬁcations, before installing the MicroMMAC-T.

3.1 UNPACKING THE MicroMMAC-T

Unpack the module carefully. Preserve and save all packaging materials for possible storage or transport of the MicroMMAC-T.

Thoroughly inspect the MicroMMAC-T immediately. If there are any signs of damage to the module, contact Cabletron Systems Technical Support immediately.

3.2 ATTACHING THE STRAIN RELIEF BRACKET

Attach the strain relief bracket to the front of the MicroMMAC-T as described:

1. From the MicroMMAC-T installation kit, locate the strain relief bracket (shown in Figure 3-1) and four 8-32 x 3/8” screws.

CAUTION: Use of longer screws may cause damage to the unit or electrical shock.

2. Attach the strain relief bracket to the bottom of the MicroMMAC-T as shown in Figure 3-1.

3-1

INSTALLATION

TOKEN RING HUB

WITH

MicroMMAC-24T

SUPPORTING 100 OHM STP CABLE

LANVIEW®

Figure 3-1. Attaching the Strain Relief Bracket

3.3 INSTALLING THE MicroMMAC-T

The MicroMMAC-T can be rack-mounted, wall-mounted, or placed on any horizontal surface. Refer to the following subsections for the appropriate installation instructions. When installing the MicroMMAC-T into something other than a 19-inch rack, installation requires the following:

• An unrestricted free surface area at least 21 inches wide, 18 inches deep, and 6 inches high.

• A single phase 85 to 264 V ac, 15A, grounded po wer receptacle located within 7 feet of the site.

• If a shelving unit is used, it must be able to support 30 pounds of static weight.

• The temperature in selected location must be between 5° and 50°C, and change less than 10°C per hour.

NOTE: Be sure that the selected location is within reach of the network cabling.

3.3.1 Rack-Mounting the MicroMMAC-T

Refer to Figure 3-2 and perform the following steps to install the MicroMMAC-T in a 19-inch rack:

1. Remove the four cover screws located along the front edges of each side of the MicroMMAC-T.

3-2

INSTALLATION

2. Using the four cover screws removed in step 1, attach the

rack-mounting brackets to each end of the MicroMMAC-T.

Wall/Rack Mounting

Brackets (2)

TOKEN RING HUB

WITH

MicroMMAC-24T

SUPPORTING 100 OHM STP CABLE

LANVIEW®

Screws (4)

Figure 3-2. Installing of Rack-Mount Brackets

3. With the mounting brackets installed, position the MicroMMAC-T

between the vertical frame members of the 19-inch rack and fasten it securely with the mounting screws (see Figure 3-3).

19-Inch Rack

TOKEN RING HUB

WITH

MicroMMAC-24T

SUPPORTING 100 OHM STP CABLE

LANVIEW®

Screws (4)

Figure 3-3. Installing the MicroMMAC-T in a 19-inch Rack

3.3.2 Wall-Mounting the MicroMMAC-T

When wall-mounting the MicroMMAC-T, the TCU ports must face downward. Perform the following steps to wall-mount the MicroMMAC-T:

NOTE: 1/4-inch Molly screw anchors for wall-mounting are not included with the MicroMMAC-T.

1. Use the supplied screws to attach the wall-mounting brackets to the

bottom of the MicroMMAC-T as shown in Figure 3-4. There are two brackets, one for each side.

3-3

INSTALLATION

Molly Screw Anchors

Bracket Screws

Molly Screws

Wall Mounting Bracket

Figure 3-4. Wall-Mounting the MicroMMAC-T

2. Select a wall location within seven feet of a power outlet for the MicroMMAC-T.

WARNING: When drilling pilot holes, any electrical wiring inside the wall may present a potential SHOCK HAZARD. Select a wall location accordingly.

3. Position the MicroMMAC-T against the wall with the network port facing down. Using a pencil, mark the wall location for the four pilot holes.

4. Set the MicroMMAC-T aside and carefully drill four 1/4” pilot holes, (one for each of the Molly screw anchors) and insert the four Molly screw anchors into the holes.

5. Place a screw in each anchor, and tighten until each anchor expands ﬁrmly in the wall; then remove the screws completely.

6. Position the MicroMMAC-T on the wall ov er the anchors and reinstall the four screws to attach the MicroMMAC-T to the wall, as shown in Figure 3-4. Tighten the four screws.

3-4

INSTALLATION

3.3.3 Free-Standing Installation

For a free-standing shelf or table top installation, locate the MicroMMAC-T, as shown in Figure 3-5, within 7 feet of its power source on an unrestricted free surface area 21 inches wide, 18 inches deep, and 6 inches high.

18 IN.

21 IN.

TOKEN RING HUB

WITH

SUPPORTING 100 OHM STP CABLE

LANVIEW®

MicroMMAC-24T

6 IN.

Max. Dist. 7 FT.

Figure 3-5. Free-Standing Installation

3.4 CONNECTING TO A POWER SOURCE

NOTE: The Micr oMMAC-T has a universal power supply that allows it to use power sources from 85 Vac to 264 Vac, 47-63 Hz.

To connect the MicroMMAC-T to the power source, plug the power cord into a grounded wall outlet. After the MicroMMAC-T runs a self test, the CPU LED blinks green to indicate normal operation. If the LED remains red, the processor is faulty.

3.5 RESETTING THE MICROMMAC-T

The MicroMMAC-T reset b utton is located on the left front panel as shown in Figure 3-6.

3-5

INSTALLATION

To reset the MicroMMAC-T:

Insert a small pointed-tip object (e.g., ballpoint pen) into the recessed reset button hole, press the button once, and then release.

TOKEN RING HUB

WITH

MicroMMAC-24T

4 Mb 16 Mb

SPEED

RESET BUTTON

RESET SWITCH

Figure 3-6. The Reset Button

SUPPORTING 100 OHM STP CABLE

LANVIEW®

3.6 SETTING THE RING SPEED

The ring speed switch is located on the front face of the MicroMMAC-T as shown in Figure 3-7.

The MicroMMAC-T’s factory-default ring speed setting is 16 Mbps.

To change the ring speed:

1. Slide the ring speed switch to the desired setting.

2. RESET the MicroMMAC-T.

3. Check that the Ring Speed LED indicates the correct setting.

3-6

MicroMMAC-24T

4 Mb 16 Mb

SPEED

TOKEN RING HUB

SUPPORTING 100 OHM STP CABLE

WITH

INSTALLATION

LANVIEW®

4 Mb 16 Mb

SPEED

On = 16 Mbps Off = 4 Mbps

Figure 3-7. The Ring Speed Switch

3.7 SETTING THE NVRAM SWITCH

Figure 3-8 shows the location of the NVRAM Reset Switch. It can be reached by a inserting a small screwdri ver through the side vent. NVRAM (Non-Volatile Random Access Memory) stores user-entered parameters such as IP address and device name.

Ring Speed LED Indicator

MicroMMAC-24T

TOKEN RING HUB

SUPPORTING 100 OHM STP CABLE

WITH

LANVIEW®

Figure 3-8. NVRAM Reset Switch Location

To restore MicroMMAC-T parameters to the factory defaults:

1. With power-ON, toggle the NVRAM switch from one position to the

other.

NVRAM

RESET SWITCH

IN HERE

3-7

INSTALLATION

2. Press the MicroMMAC-T’s Reset button. Once the module is reset, use the factory-default settings or enter new

parameters. The MicroMMAC-T stores these settings in NVRAM during normal operation and during power do wn until the reset switch is toggled again.

NOTE: Clearing and resetting NVAM does not reset the date and time.

3.8 CONNECTING LOBE PORT CABLING

The MicroMMACs 22T and 24T have unshielded RJ45 lobe ports that support UTP cabling. T o connect a UTP segment from the MicroMMA C-T to a station supporting STP cabling, a Type 3 Media Filter is required. The Cabletron Systems TRMF and TRMF-2 are available for this purpose.

The MicroMMACs 42T and 44T have shielded RJ45 lobe ports that support STP cabling. Shielded patch cables that adapt a shielded RJ45 to a data connector (MIC) are available from Cabletron Systems (PN 9372057-8). These adapter/patch cables allow connection to an existing patch panel equipped with data connectors. The MicroMMAC-T’s network lobe port pinouts are shown in Figure 3-9.

RJ45 Plug

RJ45 Plug to MIC Connector

Black

Orange

Green

Blue

MIC Connector

Pin 3 (Receive -) . . . . . . . . .to . . . Green (Transmit -)

Pin 4 (Transmit +). . . . . . . . .to . . . Orange (Receive +)

Pin 5 (Transmit -) . . . . . . . . .to . . . Black (Receive -)

Pin 6 (Receive +) . . . . . . . . .to . . . Blue (Transmit +)

3-8

INSTALLATION

RJ45 Plug

RJ45 Plug to RJ45 Plug

(at TCU) (at device port)

Pin 3 (Receive -) . . . . . . . . . to. . . . Pin 3 (Transmit -)

Pin 4 (Transmit +) . . . . . . . . to. . . . Pin 4 (Receive +)

Pin 5 (Transmit -). . . . . . . . . to. . . . Pin 5 (Receive -)

Pin 6 (Receive +). . . . . . . . . to. . . . Pin 6 (Transmit +)

Figure 3-9. Network lobe pinouts

Figure 3-10 and Figure 3-11 illustrate possible MicroMMAC-T cabling conﬁgurations.

3-9

INSTALLATION

WALL

MicroMMAC-24T

COM 2

TOKEN RING HUB

SUPPORTING 100 OHM STP CABLE

WITH

LANVIEW®

CPU

ACT

16 Mb/s

MGMT

COM 1

Token Ring Station

STP to UTP Type 3 Media Filter

Token Ring

Block

Network Interface Card

Punchdown

TRMF

Wall Jack

OFFICE

WIRING CLOSET

Figure 3-10. UTP Conﬁguration Example

UTP Lobe Cable

3-10

Token Ring Station

Token Ring Network Interface Card

WALL

MicroMMAC-44T

MIC Data Connector

Patch Panel

Wall Jack

STP Lobe Cable

MicroMMAC-24T

INSTALLATION

TOKEN RING HUB

WITH

SUPPORTING 100 OHM STP CABLE

LANVIEW®

CPU

ACT

16 Mb/s

MGMT

COM 2

COM 1

OFFICE

WIRING CLOSET

Figure 3-11. STP Conﬁguration Example

To attach a lobe segment to a MicroMMAC-T network port:

1. Insert the RJ45 connector from each twisted pair segment into an RJ45

network lobe port on the MicroMMAC-T, as shown in Figure 3-12.

LNK

TPIM-T4

LNK

TPIM-T4

Figure 3-12. MicroMMAC-T Network Ports

3-11

INSTALLATION

2. The associated Port Status LED lights green when the station boots up. If the LED doesn’t light, perform the following steps:

a. Check that the device at the other end of the twisted pair segment

has power, and that the network interface driver is initialized. b. Verify the RJ45 connector pinouts on the twisted pair segment. c. Check that the twisted pair connection meets the dB loss limits and

cable speciﬁcations outlined in Chapter 2. d. Check Local Management to ensure that the port is enabled. e. If a link still can not be established, contact Cabletron Systems

Technical Support.

3.9 INSTALLING TPIM MODULES

TPIMs provide specialized RI/R O ports for trunk connections. Each TPIM supports a different medium (cable type). Different TPIMs may be operated together: for example, a TPIM-T1 can provide a Ring-In port while a TPIM-T4 provides a Ring-Out port.

The following sub-sections explain how to set the Phantom and RI/RO Switches, how to install a TPIM into a MicroMMAC-T , and ho w to attach network segments through the TPIM.

Prior to connecting trunk cabling to the TPIMs, check the connectors for proper pinouts. Table 3-1 pro vides a cross-reference of pinouts for TPIMs used for Ring-In or Ring-Out applications.

Table 3-1. Pinout Cross-Reference for TPIMs

TPIM-T2/T4 (RJ45)

Signal

TPIM-T2/T4 (RJ45)

TPIM-T1 (DB9)

Ring-In

TX+ 6 4 9 1 TX- 3 5 5 6

3-12

Ring-Out

Ring-In

Ring-Out

INSTALLATION

Table 3-1. Pinout Cross-Reference for TPIMs (Cont.)

TPIM-T2/T4 (RJ45)

Signal

Ring-In

RX+ 4 6 1 9 RX- 5 3 6 5

TPIM-T2/T4 (RJ45)

Ring-Out

TPIM-T1 (DB9)

Ring-In

TPIM-T1 (DB9)

Ring-Out

3.9.1 Setting Phantom and RI/RO Switches

The Phantom Switch (shown in Figure 3-13) enables the port to “autowrap” if a trunk cable fails or is removed. The Phantom Switch should be set to the appropriate setting before TPIM installation. When attaching a Cabletron hub to the TPIM, leave the switch at the factory default setting of 1. When attaching a non-Cabletron device to the TPIM, such as an IBM 8228 MAU, use the 0 setting.

Ensure that the Ring-In/Ring-Out Switch is in the factory default RI/RO position. The MicroMMAC-T does not support the Station (S) setting.

NOTE: If the switch locations on the TPIM do not match the locations illustrated in Figure 3-13, refer to the TPIM Refer ence Card included with the TPIM. The TPIM Reference Card outlines switch locations and settings. For additional help, call Cabletron Systems Technical Support.

3-13

INSTALLATION

P H

A N

(See Below For Settings)

T O

Top View

RI/RO

S RI/RO

TPIM-T1/TPIM-T2/TPIM-T4 Phantom Switch Settings

1 = Cabletron Device (Default) 0 = Non-Cabletron Device

RI/RO Switch Settings

RI/RO = Ring In/Ring Out (Default) S = Station (Not Functional)

STN

TPIM-F2/TPIM-F3 RI/RO Switch Settings

RI/RO = Ring In Ring Out (Default) STN = Station (Not Functional)

Figure 3-13. The Phantom and RI/RO Switches

3.9.2 TPIM Installation

To install a TPIM, perform the following steps:

CAUTION: Observe all static precautions while handling TPIMs.

3. Remove the mounting screw from the faceplate of the RI/RO port on the MicroMMAC-T.

4. If replacing a TPIM, remove the mounting screw and pull the TPIM straight out from the MicroMMAC-T.

5. Slide the new TPIM into place as shown in Figure 3-14.

6. Ensure proper mating between the connectors on the rear of the module and on the inside of the MicroMMAC-T.

7. Reinstall the mounting screw.

3-14

INSTALLATION

LNK

TPIM-T1

Figure 3-14. Installing a TPIM

3.9.3 Connecting STP Segments

Use TPIM-T1 to connect STP segments. Before connecting a segment to the TPIM-T1, conﬁrm proper pinouts at each end of the segment.

To connect a TPIM-T1 to a Twisted Pair Segment:

1. Insert the DB9 connector on the segment into the DB9 port on the

TPIM as shown in Figure 3-15.

3-15

INSTALLATION

LNK

TPIM-T1

Figure 3-15. The TPIM-T1

2. Check that the LNK LED on the TPIM lights green. If the LED is red or is not lighted, perform each of the following steps:

a. Check that the device at the other end of the segment has power. b. Verify that the DB9 connector is pinned properly. c. Check that the twisted pair connection meets dB loss limits and

cable speciﬁcations outlined in Chapter 2. d. Check that the port is enabled through the Local Management. e. If a link still cannot be established, contact Cabletron Systems

Technical Support.

3.9.4 Connecting Twisted Pair Segments

The TPIM-T2 supports UTP cabling and the TPIM-T4 supports STP cabling. Both devices use the same method for connecting an RJ45 connector to an RJ45 port. Before connecting a segment to the TPIM-T2 /T4, check each end of the segment to ensure the wires are pinned properly .

To connect a segment to a TPIM-T2/-T4:

1. Insert the RJ45 connector on the twisted pair segment into the RJ45 port on the TPIM as shown in Figure 3-16.

3-16

INSTALLATION

LNK

TPIM-T2

LNK

TPIM-T2

Figure 3-16. The TPIM-T2/-T4

2. Check that the LNK LED on the TPIM lights green. If the LED lights

red or is not lit, perform each of the following steps: a. Check that the device at the other end of the segment has power. b. Verify that the RJ45 is pinned properly. c. Check that the twisted pair connection meets dB loss limits and

cable speciﬁcations outlined in Chapter 2. d. Check that the port is enabled through Local Management. e. If a link still can not be established, contact Cabletron Systems

Technical Support.

3.9.5 Connecting Fiber Optic Link Segments

Use TPIMs -F2/ -F3 to connect Fiber Optic Link segments. When connecting a ﬁber optic link segment to the TPIM-F2 or TPIM-F3 consider the following:

• Fiber optic link segments with ST connectors attach to ST ports much like BNC connectors attach to BNC ports. The connector is inserted into the port with the alignment key on the connector inserted into the alignment slot on the port. The connector is then turned to lock it down.

3-17

INSTALLATION

• The physical communication link consists of two strands of ﬁber optic cabling. The Transmit strand (TX) at one end connects to the Receive (RX) port at the other end and vice versa.

• Cabletron Systems labels its ﬁber optic cable to indicate which ﬁber is Receive and which is Transmit: one ﬁber is labeled 1, and the other ﬁber is labeled 2. If using a non-Cabletron cable, labeling in the above manner is recommended.

CAUTION: Do not touch the ends of the ﬁber optic strands. Dust, dirt, and other contaminants on the ends of the strands create data transmissions problems. If the ends become dirty, clean them with alcohol using a soft, clean, lint free cloth.

To connect a ﬁber optic link segment to the TPIM-F2 /-F3:

1. Remove the protective plastic covers from the appropriate ﬁber optic ports on the module and from the ends of the connectors on each ﬁber strand.

2. As shown in Figure 3-17, attach the ﬁber labeled 1 to the module’s receive port (labeled RX) and attach the ﬁber labeled 2 to the module’ s transmit port (labeled TX).

LNK

TPIM-F2

LNK

TPIM-F2

Figure 3-17. The TPIM-F2/-F3

3. At the other end of the ﬁber optic cable, attach the ﬁber labeled 1 to the transmit port of the device and attach the ﬁber labeled 2 to the recei ve port.

4. Check that the LNK LED on the TPIM lights green. If the LED does not light, perform each of the following steps:

3-18

INSTALLATION

a. Check that the device at the other end of the link has power. b. Verify that the ﬁber strands are properly “crossed-over” between

the ports on the module and on the ﬁber optic device at the other end of the ﬁber optic link segment.

c. Verify that the ﬁber connection meets the dB loss limit

speciﬁcations outlined in Chapter 2.

d. Check that the port is enabled through MicroMMAC-T Local

Management.

e. If a link still can not be established, contact Cabletron Systems

Technical Support.

3.10 CHECKING THE INSTALLATION

To check MicroMMAC-T installation:

1. Trace the ring path through the network to be sure that there are no

breaks in the ring and that it is free from logical design errors. a. Check that each cable connection is secure and logically correct. b. Verify the pinouts for each connection. c. Use a cable tester to check the cable conductors for continuity.

2. Check that all devices operating on the same network are set to the

same ring speed.

3. Ensure that the maximum number of stations is not exceeded.

4. Ensure that the maximum cable length to each station is not exceeded.

5. Ensure that the networking software is conﬁgured properly to match

the installed network.

When these checks are successfully cleared, the MicroMMAC-T is ready for normal operation. If errors or other problems are encountered, see Chapter 5, Troubleshooting, for information about diagnosing operational problems.

If problems still occur, contact your Cabletron Technical Support representative.

3-19

CHAPTER 4

LOCAL MANAGEMENT

This chapter explains how to set up a management terminal and a modem to access MicroMMAC-T’ s Local Management (LM). It also explains ho w to use Local Management tools to manage the MicroMMAC-T, its components, and its attached segments (i.e., BRIMs, MicroSNAC).

Use Local Management to Do the Following:

• Control password access to the MicroMMAC-T

• Change factory defaults

• Enable and disable ports

• Ensure ring security by controlling access to the Token Ring network

• Assign an IP address and subnet mask

• Set interface parameters for serial ports, Local Management (LM),

Serial Line Internet Protocol (SLIP), Uninterrupted Power Supply (UPS), and Telnet

• Designate which Network Management Stations (NMS) receiv e traps

from the device

• Navigate through the Management Information Base (MIB) and

manage the objects within it

4.1 MANAGEMENT TERMINAL REQUIREMENTS

To access Local Management, use one of the following management terminals:

• Digital Equipment Corporation VT series terminal

• VT type terminal running emulation programs for the Digital

Equipment Corporation VT series

• IBM or compatible PC running a VT series emulation software

package

4-1

LOCAL MANAGEMENT

Cabletron supplies an RJ45 Cable Kit with the MicroMMAC-T. This kit includes a UTP console cable with RJ45 connectors on each end. It also provides adapters for DB9 or DB25 connections. Refer to the RJ45 Cable Kit Instruction Sheet for adapter pinouts and additional instructions.

The following sections explain how to attach the console cable to the management terminal.

4.1.1 Attaching the Management Terminal

NOTE: To view booting and diagnostic test information during power-up or reset, connect the terminal to the MicroMMAC-T ‘s COM 2 port. See Section 5.3 for more information about POWER UP DIAGNOSTIC tests.

To attach a management terminal to the MicroMMAC-T:

1. Attach the connecting cable’s male RJ45 connector to either the COM 1 port or the COM 2 port on the MicroMMAC-T as shown in Figure 4-1.

2. Attach the female end (25-pin or 9-pin) to the COM port on the terminal.

COM 2 RJ45 PORT

TOKEN RING HUB

MicroMMAC-24T

SUPPORTING 100 OHM STP CABLE

CONSOLE CABLE

Figure 4-1. Management Terminal Connection

WITH

LANVIEW®

COM PORT

MANAGEMENT TERMINAL

4.1.2 Management Terminal Setup Parameters

T able 4-1 lists the setup parameters for the Local Management terminal. If you are using a Digital Equipment Corporation VT terminal, press F3 to access the Setup Directory . For PC emulations of VT terminals, refer to the emulator’s documentation for setup parameters.

4-2

LOCAL MANAGEMENT

When you have ﬁnished attaching and setting up the terminal, you can access Local Management.

Table 4-1. Terminal Settings for LM Terminal

Menu Function Selection

Display Setup Columns 80 Columns

Controls Interpret Controls Auto Wrap No Auto Wrap Text Cursor Cursor

General Setup Mode VT 100,

7 bit control

Cursor Keys Normal Cursor Keys

Communications Setup

Keyboard Setup Keys Typewriter Keys

Transmit Transmit = 9600 Receive Receive = Transmit Bits, Parity 8 Bits, No Parity Stop Bit 1 Stop Bit Local Echo No Local Echo Port Data Leads Only Auto

Answerback

Margin Bell Margin Bell Warning Bell Warning Bell Auto

Answerback

No Auto Answerback

4.1.3 Modem Cable Conﬁguration and Setup

To access Local Management from a modem, use an RS-232 cable available from Cabletron Systems. This cable connects the modem to the

4-3

LOCAL MANAGEMENT

MicroMMAC-T’s COM 2 port. Figure 4-2 shows the pinout for a cable with an RJ45 connector at the MicroMMAC-T end of the cable.

Pin 1

RJ45 COM 2 PORT

RJ45 TO 25-PIN

RJ45 COM 2

Port

CABLE

25-Pin Female

"D" Shell Connector

TRANSMIT

RECEIVE

SIGNAL GROUND

DATA CARRIER DETECT DATA CARRIER DETECT

DATA TERMINAL READY

RING

1 4 5

2 6

8 2

TRANSMIT

RECEIVE

SIGNAL GROUND

DATA TERMINAL READY

RING

Figure 4-2. Modem Cable Pinouts

4.2 ACCESSING LOCAL MANAGEMENT

To access Local Management:

1. Turn on the display terminal and then press the Return key. The MicroMMAC-T Local Management screen (Figure 4-3) appears.

4-4

LOCAL MANAGEMENT

uMMAC-T Local Management

CABLETRON Systems, Incorporated P.O. Box 5005 Rochester, NH 03867-5005 USA (603) 332-9400

Device Model Number: 00.00.01 Serial Number: 00.00.01 Functionality Level: 00.00.01 Flash Image Version: 01.00.01 BOOTPROM Version: 01.00.01 Board Revision: 00.00.01

Enter Password:

_________

Figure 4-3. MicroMMAC-T Local Management Screen

2. Enter the Password (the factory default password is the Return key)

and then press the Return key. If your password is invalid, the cursor returns to the beginning of the

password ﬁeld; otherwise, the MAIN MENU screen appears. Figure 4-4 shows the MAIN MENU screen at the top of the representational screen-access hierarchy.

NOTE: Your password is one of the community names speciﬁed in the Community Name Table. Access to certain Local Management tools depends on the degree of access accorded that community name. See Section 4.3.3 for more information about community names.

4.2.1 Accessing Local Management via Telnet

Once the MicroMMAC-T is gi ven a v alid IP address (see Section 4.3.2 for information on setting an IP address), you can establish a Telnet session with Local Management from any TCP/IP based node on the network.

4-5

LOCAL MANAGEMENT

4.2.2 Accessing Local Management from a Modem

1. Turn on the modem. The modem must be set for Auto Answer and Data Carrier Detect must be active. Refer to your modem’s user manual for operating instructions.

2. Call the modem. The MicroMMAC-T Local Management screen appears when you

establish a connection (Figure 4-3).

4.3 USING LOCAL MANAGEMENT

The MENU screens, shown in Figure 4-4, provide access to all MicroMMAC-T Local Management tools:

• MAIN MENU Screen

• SETUP MENU Screen

• STATUS MENU Screen

MAIN MENU Screen

The MAIN MENU screen is the gateway to all other Local Management MENU screens and the tools they provide. It also lets you access the DEVICE STATISTICS and Management Information Base (MIB) NAVIGATOR screens.

SETUP MENU Screen

Selections from the SETUP MENU screen let you setup and manage system parameters, establish community names, designate traps, download Flash images and establish ring security privileges.

STATUS MENU Screen

Selections from the STATUS MENU screen let you control access to MicroMMAC-T ports and monitor chassis and component functions.

4-6

LOCAL MANAGEMENT

uMMAC-T Local Management

STATUS MENU

CHASSIS STATUS COMPONENT STATUS

uMMAC-T Local Management

Flash Image Version: 01.00.01

RETURN

Flash Image Version: 01.00.01

MAIN MENU

SETUP MENU STATUS MENU DEVICE STATISTICS MIB NAVIGATOR

EXIT

uMMAC-T Local Management

Flash Image Version: 01.00.01

SETUP MENU

SYSTEM LEVEL SNMP COMMUNITY NAMES SNMP TRAPS FLASH DOWNLOAD RING SECURITY

RETURN

Figure 4-4. Local Management MENU Screens Hierarchy

NOTE: Local Management automatically disconnects after 15 minutes of keyboard inactivity. To prevent disconnection, press any key during periods of inactivity . If you are disconnected, just pr ess Return to re-access the LM password screen.

4.3.1 Working with Local Management Screens

This section describes how to work with all LM screens.

Selecting a MENU Screen Option

1. Use the Tab key or arrow keys to highlight a MENU option.

2. Press the Return key.

The selected screen appears.

Setting or Modifying Local Management Screen Fields

Local Management screen lets you set or modify and then save system ﬁelds, or parameters, singularly or globally . Use the follo wing procedures

4-7

LOCAL MANAGEMENT

(or other procedures where they are described) when working with LM screens:

1. Use the Tab key or arrow keys to highlight the parameter(s).

2. Use the spacebar to toggle through settings for ﬁelds offering selections; type settings over ﬁelds that you can edit or type over.

3. Highlight the SAVE command at the bottom of the screen after setting parameters and then press the Return key.

The “SAVED” message appears on the screen indicating that your change(s) have been saved to memory.

If you decide to exit the screen without saving your changes, the “NOT SAVED-PRESS SAVE T O KEEP YOUR CHANGES” appears on the screen.

Exiting a Local Management Screen

1. Use the Tab key or arrow keys to highlight the RETURN command at the bottom of the screen.

2. Press the Return key. Local Management returns you to the previous MENU screen.

Exiting Your Local Management Session

1. Use the Tab key or arrow keys to highlight the RETURN command at the bottom of the screen.

2. Repeat Step 1., if necessary, until you arrive at the MAIN MENU screen.

3. Use the T ab k ey or arrow keys to highlight the EXIT command at the bottom of the MAIN MENU screen.

4. Press the Return key. The Local Management screen disappears.

The remainder of this chapter describes Local Management screens and how to use the tools they provide.

4-8

LOCAL MANAGEMENT

4.3.2 The SYSTEM LEVEL Screen

The SYSTEM LEVEL Screen (Figure 4-5) displays and lets you set the following parameters:

• IP Address,

• Subnet Mask

• System Date

• System Time

• Default Gateway

• Beacon Recovery

• COM Port Applications It also displays the Physical MAC de vice address and the Default Interface.

uMMAC-T Local Management Flash Image Version: 01.00.01

SYSTEM LEVEL

System Date: 09/23/94 System Time: 12:23:57

Host IP Address Subnet Mask Default Interface Default Gateway xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx NONE DEFINED NONE DEFINED

COM 1 Application: [LM] COM 2 Application: [LM]

Beacon Recovery [ ENABLED ] Number of Retries(000-100,999-infinite):004 Retry Interval(000-999):021

Physical MAC Address: 00-00-B8-28-08-54 Local Admin Addr [ DISABLED ]: 40-00-00-00-00-00

SAVE RETURN

Figure 4-5. SYSTEM LEVEL Screen

The following sections describe SYSTEM LEVEL screen ﬁelds, their functions, and where applicable, how to use them.

Setting the System Date

Use this ﬁeld to set the correct date.

4-9

LOCAL MANAGEMENT

1. Highlight the System Date ﬁeld.

2. T ype the date into the ﬁeld in a MM/DD/YY format and then press the Return key.

3. If the format is invalid, the message “INVALID DATE” appears. Re-type the date using the correct format.

4. If the format is correct, highlight the SAVE command and press the Return key.

The “SAVED” message appears on the screen indicating that your change have been saved to memory.

Setting the System Time

Use this ﬁeld to set the correct time.

1. Highlight the System Time ﬁeld.

2. T ype the time into the ﬁeld in a HH:MM:SS format and then press the Return key.

3. If the format is invalid, the message “INVALID TIME” appears. Re-type the time using the correct format.

4. If the format is correct, highlight the SAVE command and then press the Return key.

The “SAVED” message appears on the screen indicating that your changes have been saved to memory.

Setting the Host IP Address

Use this ﬁeld to set the Internet Protocol (IP) address for the MicroMMAC-T.

NOTE: Only a user with Super-User access can change the device’s IP address See Section 4.3.3 for information about Super-User access.

1. Highlight the IP Address ﬁeld.

2. Type the IP Address into the ﬁeld. The correct format for this entry is XXX.XXX.XXX.XXX, with values of XXX ranging from 0-255.

If the format is invalid, the message “INVALID IP FORMAT” appears. Retype the IP Address using the correct format.

4-10

LOCAL MANAGEMENT

3. Press the Return key.

The new value appears in the IP Address ﬁeld.

4. If the IP Address is correct, highlight the SAVE command and then

press the Return key. The “SAVED” message appears on the screen indicating that your

changes have been saved to memory. The MicroMMAC-T will then do a soft reset.

Modifying the Subnet Mask

NOTE: Consult your Network Administrator prior to setting the Subnet Mask.

Subnets are logical divisions of the network that serv e to isolate groups of devices. The Subnet Mask determines how the MicroMMAC-T directs SNMP Trap messages (see Section 4.3.4 for information about SNMP Traps) to a destination address. The MicroMMAC-T directly addresses destinations within its own subnet. The MicroMMAC-T sends messages destined for other subnets to a router.

• Use the Subnet Mask factory default setting, 0.0.0.0, when the

workstations designated to receiv e trap messages exist within the same subnet as the MicroMMAC.

• Set a new v alue for the Subnet Mask when workstations designated to

receive traps reside on a different subnet (that is, across a gateway or router).

To modify the Subnet Mask:

1. Highlight the Subnet Mask ﬁeld.

2. Type the Subnet Mask into the ﬁeld. The format for this entry is

XXX.XXX.XXX.XXX, with values of XXX ranging from 0-255.

3. Press the Return key.

If the format is not valid, the “INVALID IP FORMAT” message appears. Retype the Subnet Mask using the correct format.

4. If the format is correct, highlight the SAVE command and then press

the Return key.

4-11

LOCAL MANAGEMENT

The “SAVED” message appears on the screen indicating that your changes have been saved to memory.

The MicroMMAC-T will then do a soft reset.

Setting the Default Gateway

The Default Gateway is the IP address of the network connection (e.g., external router) used in forwarding management information from the MicroMMAC-T (e.g., SNMP traps) to a netw ork management station. Use the Default Gateway in conjunction with the Subnet Mask.

To set the Default Gateway:

1. Highlight the Default Gateway ﬁeld.

2. Type the Gateway’ s IP address into the ﬁeld. The format for this ﬁeld is XXX.XXX.XXX.XXX with values for XXX ranging from 0 to 255.

3. Press the Return key. If the format is invalid, the message “INVALID IP FORMAT”

appears. Re-type the IP Address using the correct format.

4. If the format is correct, highlight the SAVE command and then press the Return key.

The “SAVED” message appears on the screen indicating that your changes have been saved to memory.

The MicroMMAC-T will then do a soft reset

Setting Automatic Beacon Recovery Process (ABRP) Fields

Beaconing is part of a standard IEEE 802.5 Token Ring process by which a Token Ring LAN attempts to recover from cable or hardware problems by automatically locating and bypassing the fault, thereby restoring network communications without operator intervention. If the standard process fails, beaconing can disable a token ring network. Cabletron’s ABRP protects against such network stoppages.

NOTE: ARBP is supported only by Cabletron products.

The ABRP is automatically invoked whenever a Token Ring network component problem creates a beaconing condition, and it is often able to correct the problem before the standard IEEE process begins. Once the

4-12

LOCAL MANAGEMENT

ABRP locates the problem and corrects it, the MicroMMAC-T generates traps to provide the network’ s designated remote management station with information regarding the incident, including:

• The beaconing device’s address

• The address of the beaconing device’s Nearest Active Upstream

Neighbor (NAUN)

• The beacon type

• The port(s) and/or modules left in bypass

• The duration of the beaconing condition

NOTE: To prevent users fr om r e-inserting a faulty station that could bring the network down, all objects identiﬁed as faulty and disabled by ABRP will remain disabled until a network manager repairs the fault and re-enables the object.

The MicroMMAC-T provides the following ABRP management ﬁelds:

• Beacon Recovery

• Number of Retries

• Retry Interval The Beacon Recovery ﬁeld indicates the current status of the ABRP at the

device. The ABRP occurs for the MicroMMAC-T ports and STH ports under MicroMMAC-T control only. ENABLED is the default setting in this ﬁeld and indicates that the ABRP is currently active at the device; DISABLED indicates that the ABRP is inactive at the device.

The Number of Retries ﬁeld displays and lets you modify the number of times you want the MicroMMA C-T to try to re-enable a disabled port from which a beaconing condition was detected. The default number of retries is 4. You can enter values from the range speciﬁed in the parentheses (000-100, 999: inﬁnite).

The Retry Interval ﬁeld displays and lets you modify the time delay (in increments of 7 seconds) between ring port retry attempts. The default setting is 21.

To set the Beacon Recovery ﬁeld:

1. Highlight the Beacon Recovery ﬁeld

4-13

LOCAL MANAGEMENT

2. T oggle between EN ABLED and DISABLED to make your selection.

3. Highlight the SAVE command and then press the Return key. The “SAVE” message appears on the screen indicating that your

selection was saved to memory and the new value of the ﬁeld takes effect.

To set the Number of Retries ﬁeld:

1. Highlight the Number of Retries ﬁeld and type in an allowed value.

2. Highlight the SAVE command and then press the Return key. The “SAVE” message appears on the screen indicating that your

selection was saved to memory and the new value of the ﬁeld takes effect.

To set the Retry Interval ﬁeld:

1. Highlight the Retry Interval ﬁeld and type in an allowed value (in increments of 7 only).

2. Highlight the SAVE command and then press the Return key. The “SAVE” message appears on the screen indicating that your

selection was saved to memory and the new value of the ﬁeld takes effect.

Setting COM 1 and COM 2 Applications

You can select COM port settings for LM, SLIP , UPS, Telnet, or a modem.

1. Highlight the COM port ﬁeld and toggle to selection.

2. Highlight the SAVE command and then press the Return key. The “SAVE” message appears on the screen indicating that your

selection was saved to memory and the new value of the ﬁeld takes effect.

4.3.3 The SNMP COMMUNITY NAMES Screen

Use the SNMP COMMUNITY NAMES (Figure 4-6) screen to establish SNMP community names for the MicroMMAC-T. Community names

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serve two purposes: they act as passw ords to Local Management (LM) and control SNMP management access to the MicroMMAC-T.

You control MicroMMAC-T access by establishing access policy privileges at three increasingly higher levels of security:

• Read-Only: The user can vie w any LM ﬁelds not limited e xclusiv ely

to Super-User privileges, but cannot make any changes.

• Read-Write: The user can vie w all LM ﬁelds and can edit all but the

following ﬁelds: IP address, Subnet Mask, Community Name, and Ring Security.

• Super-User: The user can view and edit all LM ﬁelds, including

community names which serve as Local Management passwords, all SNMP objects, and IP addresses.

If a user who lacks proper authorization attempts to edit a ﬁeld, the following message appears: “ A UTHORIZATION PROHIBITS A CCESS”.

CA UTION: Community Names are passwords to Local Management. Remember your Community Name.

uMMAC-T Local Management Flash Image Version: 01.00.01 SNMP COMMUNITY NAMES

Community Name Access Policy public read-only

public read-write public super-user

SAVE RETURN

Figure 4-6. SNMP COMMUNITY NAMES Screen

Instructions for using SNMP COMMUNITY NAMES screen ﬁelds are provided below.

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Community Name

This ﬁeld displays designated user names.

Access Policy

This ﬁeld displays the access privileges accorded to each community name.

Editing the Community Name ﬁeld

1. Highlight the Community Name ﬁeld.

2. Type in the password, up to 32 characters in length, into the ﬁeld. If you press the Return key without entering a password, the ﬁeld

defaults to Public.

3. Highlight the SAVE command and then press the Return key. The “SAVED” message appears indicating that your changes have

been saved to memory.

4.3.4 The SNMP TRAPS Screen

Use the SNMP TRAPS screen (Figure 4-7) to designate which remote management workstations will receive traps from the MicroMMAC-T. Traps provide messages about network and device operational statistics.

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uMMAC-T Local Management Flash Image Version: 01.00.01

SNMP TRAPS

Trap Destination Trap Community Name Enable Traps

xxx.xxx.xxx.xxx public [YES] xxx.xxx.xxx.xxx public [YES] xxx.xxx.xxx.xxx public [YES] xxx.xxx.xxx.xxx public [YES] xxx.xxx.xxx.xxx public [NO] xxx.xxx.xxx.xxx public [NO] xxx.xxx.xxx.xxx public [NO] xxx.xxx.xxx.xxx public [NO]

SAVE RETURN

Figure 4-7. SNMP TRAPS Screen

The following sections discuss the ﬁelds on the SNMP TRAPS Screen and provide instructions for using them.

Trap Destination

This ﬁeld shows the IP Address of the w orkstation that receives traps from the MicroMMAC-T.

Trap Community Name

This ﬁeld displays the user-deﬁned name of the SNMP Compliant Network Management Stations that receive traps.

Enable T raps

This ﬁeld lets you enable the transmission of SNMP trap messages.

Setting SNMP Traps

1. Highlight the Trap Destination ﬁeld.

2. Enter the IP address of the station you want to receive traps from the

MicroMMAC-T. The format for this entry is XXX.XXX.XXX.XXX, with the value of XXX ranging from 0 to 255.

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3. Press the Return key. If the format is invalid, the “INVALID IP FORMAT” message

appears. Re-type the Trap Destination IP address using the correct format.

4. Highlight the Trap Community Name ﬁeld.

5. Enter the community name of the device to receive traps and then press the Return key.

If you press the Return key without entering a community name, the ﬁeld defaults to <CR>.

6. Highlight the Enable Traps ﬁeld.

7. Enter Y (yes) to send traps from the MicroMMAC-T to the destination workstation, or N (no) to prevent traps from being sent.

8. Highlight the SAVE command and then press the Return key. The “SAVED” message appears indicating that your changes have

been saved to memory.

4.3.5 The RING SECURITY Screen

The MicroMMAC-T acts as the Ring Security Monitor for the entire ring. Users who have Super-User privileges can control access to the Token Ring network through the RING SECURITY screen (Figure 4-8). When Ring Security is enabled, the MicroMMAC-T stores in a secure database in NVRAM an allowed stations list consisting of the MA C addresses of up to 255 stations on the network.

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uMMAC-T Local Management Flash Image Version: 01.00.01

RING SECURITY

STATION ADDRESS xx-xx-xx-xx-xx-xx

Stn Edit 00-00-00-00-00-00 [ Add ] Security Mode [ Disabled ]

SAVE/EXECUTE RETURN

Figure 4-8. RING SECURITY Screen

Only stations on the ring’s allowed list can enter the ring. The MicroMMAC-T retains this allo wed list and automatically re-enables ring security whenever you power up or reset the unit.

You can select from two modes of ring security:

• Alarm Only

• Alarm/Remove. Use the MicroMMAC-T in Alarm Only mode to add stations to the ring’ s

allowed list. In Alarm Only mode, new stations can enter the ring, but a “station added” trap notiﬁes the Network Management Station (NMS) of the event. The trap includes the new station’ s MA C address so that you can decide whether to retain the new station on the ring.

Each address you approve automatically becomes part of the ring’s allowed list. Later, you can add more stations to the allowed list by temporarily disabling ring security, then re-enabling it using the Alarm Only feature.

NOTE: Do not enable Ring Security on more than one management module per ring because one management module is sufﬁcient.

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In Alarm/Remove mode, the MicroMMAC-T sends a “Remove MAC Frame Command” to new stations attempting to enter the ring. A trap sent to the NMS informs it of the action taken. If the Remove MAC Frame Command fails to remove the ne w station after three attempts, a trap to the NMS informs it that “the station could not be removed.”

The following sections discuss RING SECURITY screen ﬁelds and provide instructions for using them.

NOTE: Before enabling ring security, you need to designate which Network Management Stations you wish to receive traps. Refer to Section 4.3.4 for more information.

STATION ADDRESS

This ﬁeld lists up to 255 MAC addresses on the ring security allowed list.

Stn Edit

Use the Station Edit command to add or delete stations from the allowed list and to edit single entries on the allowed list.

Security Mode

Use this command to set the level of security for the ring. Select from the following Security Modes:

• Disabled - Use this option to temporarily disable ring security so that new stations can enter the ring. This is the factory default setting.

• Alarm Only - In this mode new stations can enter the ring, but the NMS receives a station added trap. The trap includes the new station’ s MAC address so that the NMS can decide if the ne w station should be allowed on the ring.

NOTE: The NMS receives each station added trap once only.

• Alarm/Remove - This is the highest level of ring security and locks the ring to new stations. In Alarm/Remove mode, new stations attempting to enter the ring receive a Remove MAC Frame Command, and a trap informs the NMS of the action taken. The Remove MAC Frame Command tries to automatically remove the station from the ring. If it cannot remove the station from the ring after three attempts,

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it sends a trap to the NMS informing it that the station could not be removed. The station must then be physically removed from the ring.

SAVE/EXECUTE

Use this ﬁeld to save changes made to ring security in the MicroMMAC-T’s NVRAM. You must use the SAVE/EXECUTE command for your changes to take effect.

NEXT_SCREEN

Use this command to scroll to the next screen of the allowed list database.

PREVIOUS_SCREEN

Use this command to scroll back to the previous screen of the allo wed list database.

RETURN

Use this command to exit the RING SECURITY screen and return to the SETUP MENU screen.

Changing the Security Mode

1. Highlight the Security Mode ﬁeld.

2. T oggle through options (Disabled, Alarm Only , Remo ve/Alarm) and

select the desired option.

3. Highlight the SAVE/EXECUTE command and then press the Return

key. The MicroMMAC-T enables the selected mode of ring security. The

following message appears at the top of the screen: “SECURITY MODE CHANGED.”

Building the Allowed List Automatically

1. Set the Security Mode to Disabled (as described above) and then set

the Security Mode to Alarm Only. Ring Security automatically builds an allowed list only after the

Alarm Only mode has been invoked from the Disabled mode.

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2. Highlight the SAVE/EXECUTE command and then press the Return key.

Viewing the Revised Allowed List

1. Highlight the RETURN command and then press the Return key.

The SETUP MENU screen appears.

2. Highlight RING SECURITY and then press the Return key. The RING SECURITY screen appears, showing the revised Station

Address allowed list.

Adding Stations to the STATION ADDRESS Allowed List

1. Highlight the Stn Edit ﬁeld.

2. Using the following format, type the MAC address of the station you want to add: XX-XX-XX-XX-XX-XX. Use the Backspace key to delete unwanted characters.

3. Highlight the Add/Del ﬁeld and then select Add.

4. Highlight the SAVE/EXECUTE command and then press the Return key.

The new MAC address appears on the STATION ADDRESS allo wed list.

Deleting Stations from the STATION ADDRESS Allowed List

1. Set ring security to the Alarm/Remove mode.

2. Highlight the Stn Edit ﬁeld.

3. Using the following format, type the MAC address of the station you want to delete: XX-XX-XX-XX-XX-XX. Use the Backspace key to delete unwanted characters.

4. Highlight the Add/Del ﬁeld and select Del.

5. Highlight the SAVE/EXECUTE command and then press the Return key.

The station’s MAC address no longer appears on the STATION ADDRESS allowed list.

NOTE: You cannot delete the Micro-MMAC-T address from the list.

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4.3.6 The DEVICE STATISTICS Screen

The DEVICE ST ATISTICS screen (Figure 4-9) displays ring information, isolating errors, and non-isolating errors.

uMMAC-T Local Management Flash Image Version: 01.00.01

DEVICE STATISTICS (TOTAL)

RING INFORMATION Frames Received: 4572 Active Monitor Addr: 00-00-B8-28-08-54 KBytes Received: 10157 Ring Status: Normal Errors Received: 0 Ring Number: 0 Beacon States: 0 Stations on Ring: 1 Ring Purges: 2 Ports Enabled: 0 Active Monitor Changes: 1 Ring Speed (Mb/s): 4

ISOLATING ERRORS NON-ISOLATING ERRORS Line Errors: 0 Lost Frame Errors: 0 Burst Errors: 0 Frame Copied Errors: 0 AC Errors: 0 Rcvr Congestion Errors: 0 Abort Transmit Errors: 0 Token Errors: 0 Internal Errors: 0 Frequency Errors: 0

[ TOTAL ] [ REFRESH 3sec ] RETURN

Figure 4-9. DEVICE STATISTICS Screen

The following sections discuss the ﬁelds on the DEVICE STATISTICS screen and provide instructions for using them.

DEVICE STATISTICS

The DEVICE STATISTICS counter mode ﬁeld at the top of the screen (Figure 4-9 sho ws an sample screen in the TO TAL counter mode) displays the method used for compiling device statistics. The method is selected from the corresponding counter mode ﬁeld located at the bottom of the screen.

The MicroMMAC-T compiles and displays statistics from three separate

counter modes:

• ACCUMULATE: This mode lets you initiate a new statistic count for

a speciﬁed time period (procedure described below).

• DELTA: This mode automatically displays statistics describing

network performance since the last screen refresh (3 to10 seconds).

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• TOTAL: This mode automatically displays statistics describing network performance since the last power-up.

Selecting the Device Statistics Counter Mode

1. Highlight the current mode at the bottom of the screen and toggle to a counter mode selection.

2. Press the Return key. The selected counter mode appears at the top and the bottom of the

screen.

Using the ACCUMULATIVE Counter Mode

1. Select the ACCUMULATIVE counter mode. The following ﬁelds appear on the screen: Date Cleared and Time

Cleared in the upper right part of the screen and Clear at the lower left part of the screen.

2. Highlight Clear and press the Return key. The Date Clear and Time Clear ﬁelds change to reﬂect the beginning

of the period over which you want to view device statistics.

Setting the Refresh Field

This ﬁeld displays the time interval between screen counter updates. You can choose refresh intervals from 3 to 10 seconds.

1. Highlight the REFRESH3sec ﬁeld at the bottom of the screen.

2. Use the spacebar to toggle through time intervals, or use Shift and the + key to increment the time interval and Shift and the - key to decrease the time interval.

3. Press the Return key to save your changes.

DEVICE STATISTICS screen read-only ﬁelds are described below:

Frames Received

This ﬁeld displays the frames received by the MicroMMAC-T.

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KBytes Received

This ﬁeld displays the sum in kilobytes of frames received by the MicroMMAC-T.

Errors Received

This ﬁeld displays the Isolating and Non-Isolating Errors (described below) detected on the ring.

Beacon States

This ﬁeld displays the beacon conditions detected on the ring. Stations transmit beacons when they detect bit streaming or signal loss on the ring.

Ring Purges

This ﬁeld displays the ring purge frames transmitted by the activ e monitor .

Active Monitor Changes

This ﬁeld displays the number of times the active monitor has changed.

ISOLATING ERRORS

Isolating Errors are “soft” ring errors that indicate the domain of a fault. That is, the active monitor can isolate the f ault’s region to the transmitting adapter, the receiving adapter, the cable, and the components between them. The errors are described below:

Line Errors

This ﬁeld displays the total line errors detected on the ring. Line Errors are corrupted frames that are detected by a node. This type of error normally occurs when stations enter and leave the ring.

This error can also indicate a problem with the receiver of the reporting node, or the transmitter of its Nearest Active Upstream Neighbor (N A UN), or the cabling and hub hardware between them.

Burst Errors

This ﬁeld displays the total burst errors detected on the ring. Burst Errors are the absence of clocking signals at a node’ s receiver . This error normally

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occurs when stations enter or leave the ring with the absence of phantom current.

This error can also indicate a problem with the receiver of the reporting node, or the transmitter of its NAUN, or the cabling and hub hardware between them.

AC Errors

This ﬁeld displays the total Address Recognized/Frame Copied errors. This indicates that the reporting NAUN is faulty. The node cannot set the address recognized indicator and/or frame copied indicator bits in the frame which it has copied. This leaves the downstream node with an incorrect NAUN address.

Abort T ransmit Errors

This ﬁeld displays the total abort delimiter frames transmitted by a station. This indicates that either the reporting node has detected an error on itself, or there is an error with its NA UN, or the cabling and wiring hubs between them.

Internal Errors

This ﬁeld displays the total internal errors detected by the adapter’s hardware and/or ﬁrmware. These errors cause the adapter to remo ve itself from the ring and indicates a problem with the adapter hardware or ﬁrmware.

RING INFORMATION

Ring Information provides ring status information.

Active Monitor Addr

This ﬁeld displays the MAC address of the active monitor. The active monitor initiates recovery procedures from various error situations.

Ring Status

This ﬁeld displays the following Ring Status conditions:

Unknown -- Indicates that the management station is not inserted into

• the ring and therefore cannot determine the ring state

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• Closed -- Indicates that the management station has closed the adapter

•

Normal -- Indicates the ring is running with no problems, and tokens

are being detected by the management station

•

Purge -- Indicates that the active monitor has issued a ring purge

command. Communications will be restored when a new token is released

Contention -- Indicates that the ring has entered into the active monitor

•

contention process to determine a new active monitor for the ring

•

Beaconing -- Indicates that the management station has detected a

beacon frame

•

Lobe Fail -- Indicates that a station failed the lobe self-test when it

attempted to insert into the ring

Ring Number

This ﬁeld displays the assigned number of rings on the network.

Stations on a Ring

This ﬁeld displays the number of stations inserted into the ring.

Ports Enabled

This ﬁeld displays the number of network lobe ports enabled.

Ring Speed

This ﬁeld displays the ring speed of the MicroMMAC-T as either 4 Mb/s or 16 Mb/s.

NON-ISOLATING ERRORS

Non-Isolating Errors are “soft error” conditions that could have been caused by any station on the ring. Their fault domain cannot be detected.

Lost Frame Errors

This ﬁeld displays the total number of Lost Frame Errors. These errors occur when the adapter fails to receive the end of the frame it has just transmitted. The frame was lost some where on the ring but there is no way to pinpoint where. This can be caused by stations entering or leaving the ring.

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Frame Copied Errors

This ﬁeld displays the total number of Frame Copied Errors. These errors occur when a station ﬁnds a frame with its address as the destination, but ﬁnds the address recognized indicator bits not set to zero. This indicates a possible duplicate address.

Rcvr Congestion Errors

This ﬁeld displays the total number of Rcvr Congestion Errors. This indicates a station is receiving/repeating a frame and recognizes a frame addressed to it, but has no buffer space available for the frame.

Token Errors

This ﬁeld displays the total number of Token Errors. Token Errors occur when an active monitor does not see a tok en circulating on the ring before its Timer Valid Transmission (TVX) time expires (e.g. a lost frame error has occurred), or sees a recirculating frame or token. The acti ve monitor is responsible for purging the ring and issuing a new token.

Frequency Errors

This ﬁeld displays the total number of frequency errors. This indicates that the frequency of the incoming signal deviates excessively from the adapter’ s onboard crystal oscillator . It could indicate an error in this node’s oscillator, the active monitor, or any node in between. When the node detects a frequency error, it enters the monitor contention process to establish a new active monitor.

4.3.7 The CHASSIS STATUS VIEW Screen

The CHASSIS STATUS VIEW screen lets you monitor and manage the operational status of the station ports and RI/RO ports on the MicroMMAC-T and the station ports on its attached non-intelligent STH hubs. It also lets you monitor and managed attached BRIMs (the CR-BRIM-W/T and the MicroSNAC device provide their own comprehensive console access management tools).

The CHASSIS STATUS VIEW screen supports three separate screen modes:

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• OPERATIONAL (Figure 4-10) -- Lets you monitor the operational

status of the Token Ring network

• ADMINISTRATIVE (Figure 4-11) -- Lets you manage access to the

Token Ring network

• RING OUT ENABLE (Figure 4-12) -- Lets you enable all ports The following sections describe generic CHASSIS STA TUS VIEW screen

ﬁelds and control procedures.

Mode

This ﬁeld, located within parentheses next to the screen title, displays the current screen mode.

Port Status

These ﬁelds consist of the columns of numbered ports located under the device identiﬁers (MMAC24, STH24, et al). They display port-status information and let you selectively enable and disable ports when in the ADMINISTRATIVE mode.

Virtual Flexible Network Bus (VFNB)

Use this ﬁeld (a quasi Network Bus), located at the top of each the port-status column under the device identiﬁer, to either bypass or activate a module, or hub, when in the ADMINISTRATIVE mode.

Possible VFNB screen conﬁgurations for Enabled modules are described as follows:

• Attached left (<----|): The module is connected via cabling to the next

module. For example, the MicroMMAC-T conﬁgured as module 1 is connected to STH module 2

• Attached right (|---->): The STH 2, for example, is connected to the

MicroMMAC-T

• Attached left/right (<---->): The STH is connected to the STH or

MicroMMAC-T before it and the STH after it.

• Detached (|-----|): The MicroMMAC-T is not connected to an STH

module.

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VFNB screen conﬁgurations for Bypassed modules are described as follows:

• Bypassed (|--B--|): The MicroMMAC-T is in the bypass mode and is not connected to an STH module.

• Bypassed left (<--B--|): The MicroMMAC-T or the STH is in the bypass mode, but it is connected to the next module.

• Bypassed right (|--B-->): The STH is in the bypass mode, but it is connected to the module before it.

• Bypassed left/right (<--B-->): The STH is bypassed by the STH or MicroMMAC-T before it and the STH after it.

Screen Mode Status

Use this ﬁeld to select ADMINISTRATIVE, OPERATIONAL, or RING OUT ENABLE screen status modes. It is located within parentheses at the bottom of the screen.

ENABLE ALL PORTS (ADMINISTRATIVE mode only)

Use this ﬁeld to enable all MicroMMAC-T and connected STH hub ports.

Use this ﬁeld to scroll to the next screen.

Use this ﬁeld to scroll to the previous screen. This ﬁeld appears only after the NEXT command has been invoked.

REFRESH 3SEC

This ﬁeld displays the time interval between screen counter updates. You can choose refresh intervals of 3 to 10 seconds.

RETURN

Use this ﬁeld to return to the STATUS MENU screen.

Selecting OPERATIONAL, ADMINISTRATIVE, or RING OUT ENABLE Mode Screens

1. Highlight the screen mode status ﬁeld.

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2. T oggle to a screen mode selection, or press a for ADMINISTRA TIVE,

o for Operational, or

r for RING OUT ENABLE, and then press the

Return key. The selected screen mode appears.

Setting the REFRESH Field

1. Highlight the REFRESH3sec ﬁeld.

2. Use the spacebar to toggle through time intervals, or use Shift and the

+ key to increment the time interval and Shift and the - k ey to decrease the time interval.

3. Press the Return key to save your changes.

Using the OPERATIONAL Mode Screen

The OPERATIONAL mode screen (Figure 4-10) is a display-only screen that shows the token ring access status of hub ports and de vices. By default the OPERATIONAL mode screen shows the status of ports 1-12 for the MicroMMAC-T and attached STH hubs.

uMMAC-T Local Management Flash Image Version: 01.00.01 CHASSIS STATUS VIEW ( OPERATIONAL )

5 4 3 2 1 STH24 MMAC24 |---> <---| 16Mb/s 16Mb/s 1 [BYP] 1 [INS] 2 [BYP] 2 [INS] 3 [ENB] 3 [INS] 4 [LNK] 4 [INS] 5 [LNK] 5 [INS] 6 [LNK] 6 [ENB] 7 [ENB] 7 [ENB] 8 [ENB] 8 [ENB] 9 [INS] 9 [ENB] 10 [INS] 10 [ENB] 11 [INS] 11 [ENB] 12 [INS] 12 [ENB]

NEXT [ OPERATIONAL ] [ REFRESH 3sec ] RETURN

Figure 4-10. CHASSIS STATUS VIEW (OPERATIONAL) Screen

Station ports, on any module, can be in either of the following four operational states:

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• ENB (Enabled): The port is enabled and allows an attached station to enter the ring.

• BYP (Bypassed): The port is disabled and the station is not on the ring.

• LNK (Linked): The port is disabled and an attached station is trying (sending phantom current) to access the ring

• INS (Inserted): The port is enabled and the attached station is operational.

Ring In/Ring Out ports can be in either of the following two operational states:

• A CT (Activated): The port or device is enabled and connected to the ring trunk cable.

• WRP (Wrapped): The port or device is in the wrap state; there is no access to the ring trunk cable.

BRIMs and the MicroSNAC device can be in either of two operational states: ENB or BYP.

To display the status of ports 13-24:

1. Highlight the NEXT command and then press the Return key.

The screen displays the status of ports 13-24 for all modules.

2. Highlight the PREVIOUS command and then press the Return key to return to the previous screen.

To display the status of RI/RO ports, BRIMs, or the MicroSNAC device:

1. Highlight the NEXT command and then press the Return key. Repeat Step 1. as many times as necessary to display the status of the

device you want. The screen displays the selected device’s status.

2. Highlight the PREVIOUS command and then press the Return key to return to the previous screen.

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Using the ADMINISTRATIVE Mode Screen

In addition to displaying the operational status of ring ports, the ADMINISTRATIVE mode screen provides you with two methods for controlling access to them:

• Bypassing ports.

• Enabling and Disabling ports. When you bypass a module, or device, you not only remove it from the

Token Ring to which it was previously attached, but you also establish a separate, or stand-alone, Token Ring composed only of the terminals attached to the ports on the bypassed module.

This capability is useful, for example, when you want to establish a secondary ring to run at a slower data transmission speed, or for segregating a user group sharing a common application, or for security reasons.

Enabling or disabling ports simply turns them on and off.

uMMAC-T Local Management Flash Image Version: 01.00.01 CHASSIS STATUS VIEW ( ADMINISTRATIVE )

5 4 3 2 1 STH24 MMAC24 |---> <---| 16Mb/s 16Mb/s 1 [ON] 1 [ON] 2 [ON] 2 [ON] 3 [ON] 3 [ON] 4 [ON] 4 [ON] 5 [ON] 5 [ON] 6 [ON] 6 [ON] 7 [ON] 7 [OFF] 8 [ON] 8 [OFF] 9 [ON] 9 [OFF] 10 [ON] 10 [OFF] 11 [ON] 11 [OFF] 12 [ON] 12 [OFF]

NEXT ENABLE ALL PORTS [ ADMINISTRATIVE ] [ REFRESH 3sec ] RETURN

Figure 4-11. CHASSIS STATUS VIEW (ADMINISTRATIVE) Screen

To enable and disable select ports:

1. Highlight the port status ﬁelds showing either ON or OFF.

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2. T oggle between ON and OFF , mak e your selection, and then press the Return key.

Enabled ports provide access for other stations into the token ring network; disabled ports cannot provide access to the ring until they have been enabled.

To enable all ports for all modules:

1. Highlight the ENABLE ALL POR TS ﬁeld.

2. Press the Return key. All ports are enabled.

To bypass all ports on a module:

1. Highlight the VFNB (located under the module identiﬁer).

2. Use the spacebar to toggle from the horizontal dash character, to the bypass mode identiﬁer, (-B-), make your selection and then press the Return key.

The entire module is bypassed from the Token Ring.

To reconnect a module to the token ring:

1. Highlight the bypass mode identiﬁer, (-B-).

2. Toggle to the vertical dash character and then press the Return key. The module is now connected to the Token Ring.

Using the RING OUT ENABLE Mode Screen

Use the RING OUT ENABLE mode screen to switch ports from the default Station (STN) status to RING OUT (RO) enable status.

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uMMAC-T Local Management Flash Image Version: 01.00.01 CHASSIS STATUS VIEW ( RING OUT ENABLE )

5 4 3 2 1 STH24 MMAC24 |---> <---| 16Mb/ 16Mb/s 1 [RO] 1 [STN] 2 [RO] 2 [STN] 3 [RO] 3 [STN] 4 [RO] 4 [STN] 5 [RO] 5 [STN] 6 [STN] 6 [RO] 7 [STN] 7 [RO] 8 [STN] 8 [RO] 9 [STN] 9 [RO] 10 [STN] 10 [RO] 11 [STN] 11 [RO] 12 [STN] 12 [RO]

NEXT [ RING OUT ENABLE ] [ REFRESH 3sec ] RETURN

Figure 4-12. CHASSIS STATUS VIEW (RING OUT ENABLE) Screen

To switch to and from STN and RO:

1. Highlight the port-status ﬁeld showing STN or RO.

2. Toggle between STN and RO, make selection and then press the

Return key. You can now connect the RO enabled ports to Multi-Station Access

Unit (MAU) RI ports.

4.3.8 The COMPONENT STATUS Screen

The COMPONENT STATUS Screen (Figure 4-13) displays the Administrative status of components operating in the MicroMMAC-T.

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uMMAC-T Local Management Flash Image Version: 01.00.01

COMPONENT STATUS

Component Name Admin. Status

Chassis Mgr enabled Local Mgmt enabled SNMP Agent enabled Protocol Stack enabled Telnet enabled RMON enabled Network 1 enabled Network 2 enabled

RETURN

Figure 4-13. COMPONENT STATUS VIEW Screen

4.3.9 The MIB NAVIGATOR Screen

The MIB NAVIGATOR screen (Figure 4-14) provides the MIB NAVIGATOR prompt where you can issue commands for navigating and modifying the Management Information Base (MIB) structure. MIBs are the databases of objects used for managing MicroMMAC-T devices management systems.

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LOCAL MANAGEMENT

Welcome to Cabletron MicroMMAC-T Revision 01.00.01

MIBNav-> help

Figure 4-14. MIB Navigator Screen

The following sections deﬁne MIB commands and describe how to get help on using them.

To access a list of MIB commands:

Type “help” or “?” at the MIB prompt and then press the Return key. The MIB NAVIGATOR screen appears showing the MIB Na vigational and

Built In commands listed in Table 4-2.

To get help on speciﬁc commands:

Type help <command> and then press the Return key.

To escape from the MIB NAVIGATOR screen:

T ype either of the Special commands: done, exit, or quit at the prompt and press the Return key to return to the MAIN MENU screen.

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LOCAL MANAGEMENT

Table 4-2. MIB Commands

Navigation Built-In Special

branchcd ctronarp defroute netstat done

dir get ls ping snmp-

snmpget quit

branch

mib2next pwdsnmpsetsnmptree tracer-

exit

oute set show su tree whoa

Navigational commands

Navigational commands allow you to access and manage MIB objects for the device. MIB Commands are described as follows:

branch

This command displays the object leaves of a speciﬁed directory tree.

This command changes directories within a MIB sub-tree.

ctron

This command changes directories to the Cabletron MIB.

dir, ls, show

These commands display contents of a speciﬁed sub-tree.

get

This command provides you with a speciﬁed object value.

mib2

This command changes directories to MIB2.

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LOCAL MANAGEMENT

This command shows the next leaf in a path.

pwd

This command displays the full path name of the directory in which you are working.

set

This command lets you set the value of a managed object.

This command lets you change your community name.

tree

This command displays an entire MIB for a device.

whoami

This command displays community name and access privileges to the MIB.

Built-In commands

Built-In commands allow you to access and manage network devices connected to the device. Commands are described as follows:

arp

This command lets you access the Address Resolution Protocol (arp) cache to view cache data delete entries, or add a static route.

defroute

This command lets you set the default IP route to a device through a speciﬁed interface.

netstat

This command lets you display general network statistics for a managed device.

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LOCAL MANAGEMENT

ping

This command let you generate an outbound ping request.

snmp branch

This command lets you query another SNMP device.

snmpget

This command lets you query another SNMP device to obtain a value for an object.

snmpset

This command lets set the values of object in other devices.

snmptree

This command displays all objects and their values in a device.

traceroute

This command generates a TRACEROUTE request to an IP address.

4.3.10 The FLASH DOWNLOAD Screen

The FLASH DOWNLOAD Screen (Figure 4-15) lets you upgrade the operating image for the device.It allo ws you to chose a download method: RUNTIME or DOWNLOAD, to specify method-dependent options, to select a TFTP server, and to select the name and location of the image.

To download a Flash image:

1. Set values for the screen’s ﬁelds.

2. Highlight EXECUTE and then press the Return key.

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LOCAL MANAGEMENT

uMMAC-T Local Management Flash Image Version: 01.00.01

FLASH DOWNLOAD

Download Method: [RUNTIME]

Reboot after Download: [YES]

Flash Image Server IP: xxx.xxx.xxx.xxx

Flash Image File Name: c:\hex\micro_t.hex

Download Server IP: xxx.xxx.xxx.xxx

Download File Name: c:\hex\micro_t.fls

EXECUTE RETURN

Figure 4-15. The FLASH DOWNLOAD Screen

The following sections discuss the ﬁelds on the FLASH DOWNLOAD screen and provide instructions for using them.

Download Method ﬁeld

Use the Download Method ﬁeld to select either the RUNTIME or the BOOTPR OM download method. The Reboot after Download ﬁeld appears when the RUNTIME method is used, and the Commit to Flash ﬁeld appears when the BOOTPROM method is used.

The RUNTIME method permanently changes the image in Flash, replacing the currently stored version while the management device is operational. The process neither interrupts network operations nor af fects the currently running LM application. When the device is reset, the new image takes effect.

To chose the RUNTIME method:

1. Highlight the Download Method ﬁeld.

2. Toggle from BOOTPROM to RUNTIME, if necessary, using the spacebar.

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LOCAL MANAGEMENT

The Reboot after Download ﬁeld appears by default when the RUNTIME method is used. If YES is selected, the MicroMMAC-T will automatically reset after the image is downloaded into Flash to load the new image into the active system ﬁle.

You can choose to use the BOOTPROM method also. It forces the de vice to reset and reboot from the download server rather than from the image stored in Flash.

To choose the BOOTPROM method:

1. Highlight the Download Method ﬁeld

2. Toggle from RUNTIME to BOOTPROM using the spacebar. When BOOTPROM is selected, the Commit to Flash toggle ﬁeld

appears, replacing the Reboot after Download ﬁeld. If YES is chosen, the device will automatically replace the old image in Flash with the new image. If NO is chosen, the new image will be downloaded into active memory only, leaving the prior image in Flash unaffected and available for use at ne xt reset. The NO option allo ws the user to test a new system ﬁle without losing the prior system ﬁle.

Flash Image Server IP

This read-only ﬁeld shows the IP address of the most recently used ﬁle server.

Flash Image File Name

This read-only ﬁeld shows the ﬁle name of the most recently do wnloaded image.

Download Server IP

Use this editable ﬁeld to enter the IP address of the ﬁle server containing the desired Flash image.

Download File Name

Use this editable ﬁeld to enter the name of the ﬁle you want to download.

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CHAPTER 5

TROUBLESHOOTING

This chapter describes and explains how to use LANVIEW LEDs and the Liquid Crystal Display (LCD) to troubleshoot physical layer network problems. The chapter concludes with an overview of the POWER UP Diagnostic Test.

5.1 USING LANVIEW LEDs

LANVIEW LEDs (located on the front panel) are Cabletron Systems’ built-in visual diagnostic and status monitoring system. Use the LEDs to monitor network status or diagnose physical-layer network problems. Table 5-1 below lists and describes front panel LEDs.

Table 5-1. LANVIEW LEDS

LED NAME LED COLOR DEFINITION

Lobe Port Status (Ports 1-24)

16Mb/s (Ring Speed)

ACT (Network Activity)

MGMT (Network Management)

CPU (Central Processing Unit)

Off Green Red Red (blinking)

Yellow Off

Green (Flashing) Red (Flashing) Off

Green Red

Off Green (Flashing) Green (Blinking) Red Yellow Yellow/Green

No Link/Port Enabled Link/Port Enabled No Link/Port Disabled Link or Ring Speed Fault/Port Disabled

16MbpsRing Speed 4 Mbps Ring Speed

Good Frames Beacon Recovery Running No Activity

Management Agent Active Management Agent Not Active

No Power CPU Initializing CPU Functioning (normal) CPU Not Functioning Diagnostic T esting Booting

NOTE: “Flashing” indicates an irregular LED pulse. “Blinking” indicates a steady LED pulse.

5-1

TROUBLESHOOTING

5.2 USING THE LCD DISPLAY

The MicroMMAC-T is equipped with an LCD and a LCD display button as shown in Figure 5-1.

LCD

MicroMMAC-24T

DISPLAY

16M4M

DISPLAY

SPEED

RESET

TOKEN RING HUB

SUPPORTING 100 OHM UTP CABLE

LCD DISPLAY BUTTON

16 Mb/s

COM 1COM 2

CPU

WITH

LANVIEW®

ACT

MGMT

EPIM-C

24 23

12 11

Figure 5-1. LCD Display

The LCD is a diagnostic tool for viewing the following important status information about the MicroMMAC-T:

• Power up diagnostics

• Revision levels

• Hardware, MAC address, or locally administered address

• IP address

• Error conditions.

The LCD presents four types of messages:

• Static System Messages

• Saved Alarm Messages

• Unsaved Initialization Messages

• Saved System Messages

The following sections describe messages for each category.

5-2

TROUBLESHOOTING

5.2.1 Static System Messages

Static System messages (T able 5-2) display MicroMMA C-T conﬁguration information. To view them, press and release the Display button (Figure 5-1). Press the Display button to scroll through each message. If the Display button is not pressed again within ten seconds, the display defaults back to the product name.

Table 5-2. Static System Messages

Displayed Message Signiﬁcance

IP Address xxx.xxx.xxx.xxx MAC Address xx.xx.xx.xx.xx.xx RAM Image Rev. xx.xx.xx Boot PROM Rev. xx.xx.xx Flash Programmed xx Times COM 1 Baud Rate xxxxxx COM 1 Function xxxxxx

Displays current IP address. This can be changed via Local Management

Displays Hardware or MAC address

Displays currently executing image

Displays internal Boot PROM version number

Displays number of times Flash EEPROM has been programmed.

Displays COM 1 Port’s current Baud rate

Displays COM 1 Port’s current function (Local Management console, UPS, or SLIP)

COM 2 Baud Rate xxxxxx COM 2 Function xxxxxx

Displays COM 2 Port’s current Baud rate

Displays COM 1 Port’s current function

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TROUBLESHOOTING

5.2.2 Alarm Messages

Alarm messages (Table 5-3) describe events that occur within the MicroMMAC-T. To view the Alarm Messages queue, press the Display button (Figure 5-1) and hold for ﬁve seconds. Press the Display button to scroll through each message. If the Display button is not pressed again within ten seconds, the display defaults back to the product name.

Table 5-3. Alarm Messages

Displayed Messages

NO MESSAGES IN QUEUE TPIM Inserted TPIM Removed Stack x Inserted

Stack x

Removed Stack x Port xx Violation

Signiﬁcance

No alarm messages in queue. This is the Alarm Messages default setting.

TPIM inserted into RI or RO.

TPIM removed from RI or RO.

The x Stack inserted (where x is any value from 2 to

5).

The x Stack removed (where x is any v alue from 2 to

5).

Indicates unauthorized attempt to access net work lobe ports.

uMMACT Port xx Violation

Ring Beaconing Beacon Recovered uMMACT Port xx

Removed

5-4

Indicates unauthorized attempt to access network lobe ports.

Indicates a station is attempting to recover from a hardware problem on the ring.

Indicates the ring has recovered from a beaconing situation.

Indicates that a station has been removed from the ring as a result of the beacon recovery process

Cabletron Systems 42T, MicroMMAC 24T MICROMMAC-, MicroMMAC 44T MICROMMAC-, MICROMMAC-22T, MICROMMAC-24T User Manual

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