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3Com LINKBUILDER 3C18500, User Manual

The 3Com LINKBUILDER 3C18500 is a cutting-edge networking device designed for seamless connectivity. Enhance your network configuration with this versatile product. To explore all the features and settings, simply download the free User Manual from manualshive.com. Gain a deeper understanding of your device and maximize its potential.

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5

 

Introduction

 

The chapter starts by explaining the way to control the VT100 interface 

 

with various key combinations. 

 

By way of overview of the screens, a complete menu map is given to 

 

enable you to follow the paths to the screen of your choice. 

 

Each choice from the Main Menu screen is given a section. Any screens 

 

which branch from a choice have their own subsections. But this only 

 

applies as far as the branch into specific media management as there 

 

are dedicated manuals for these.

 

The displayed screens may not be identical to those illustrated in this 

 

chapter. The contents of screens depend on the security level of the 

 

person accessing it, what modules are installed and other similar 

 

factors.

Summary of Contents for LINKBUILDER 3C18500

Page 1: ...LINKBUILDER MSH MANAGEMENT MODULE 3C18500 USER GUIDE Part No DUA1850 0AAA05 Published January 1996 ...

Page 2: ...uplication or disclosure by the Government is subject to restrictions as set forth in subparagraph c 1 ii for restricted Rights in Technical Data and Computer Software clause at 48 C F R 52 227 7013 3Com Ireland c o 3Com Limited ISOLAN House Brindley Way Hemel Hempstead Herts HP3 9XJ UK For civilian agencies Restricted Rights Legend Use reproduction or disclosure is subject to restrictions set for...

Page 3: ...Overview of the MSH 2 2 The MSH Backplane 2 4 MSH Services 2 4 The Management Module 2 6 Functions of the Management Module 2 7 Methods of Managing the MSH 2 8 Access Levels 2 8 Default Users 2 9 Management over the Network 2 10 Using 3Com Network Managers 2 10 Using alternative SNMP Network Managers 2 10 The MSH SNMP Management Information Base MIB 2 11 Using the VT100 Management Interface 2 11 U...

Page 4: ... Managing over the Network 3 9 Setting up SNMP Management Communications 3 10 Protocol Addresses 3 10 Setting up 3 11 If You Change an MSH Module 3 11 Connecting Devices for Automatic Monitoring 3 12 Installation Summary 3 14 II CHASSIS MANAGEMENT 4 MANAGING THE CHASSIS USING THE DISPLAY PANEL Display Panel LED 4 2 Using the Display Panel 4 3 Introduction 4 3 Searching the Menus 4 5 The First Move...

Page 5: ...14 Changing Passwords 5 16 MSH Setup 5 17 Setting the Trap Destination Address 5 20 Setting the Serial Port Parameters 5 21 Switching MACs 5 22 MSH Status 5 24 Fault Log 5 25 Resetting the MSH Chassis 5 26 Persistent Data Store 5 26 Resetting with Stored Settings 5 27 Resetting to Factory Settings 5 28 Upgrading the Management Module System 5 29 Remote Poll 5 31 Module Management 5 32 Configuring ...

Page 6: ...iguration 7 4 Statistics 7 5 8 MANAGING 802 3 REPEATERS USING THE VT100 INTERFACE Facility Table 8 2 Ethernet Movements 8 2 Introduction to Repeater Management 8 4 Management in general 8 5 Management Levels 8 5 Management Types 8 6 Managing the Repeater 8 8 Repeater Configuration 8 8 Repeater Statistics 8 9 Managing Modules 8 10 Module Configuration 8 10 Module Statistics 8 12 Managing Ports 8 13...

Page 7: ... Token Ring Services 9 11 Isolated RingBuilders 9 12 Isolated Token Ring MAUs 9 12 Token Ring Configuration 9 13 Maximum Number of Local Ring Sections 9 13 Ring Selection 9 13 Position Dependence 9 13 Station Location on a Local Ring Section 9 13 Extending the Local Ring Section 9 15 RingBuilder Modes 9 15 Using the RingBuilder Ring In Ring Out Ports 9 17 Ring Topology and Sizing 9 20 Ring Speed 9...

Page 8: ...lder Setup 11 7 RingBuilder MAC Addresses 11 10 Ring Statistics 11 11 Ring Topology 11 12 Station Sequence in the Topology List 11 13 Ring Station Statistics 11 13 Ring Module Status 11 16 Ring Module Setup 11 17 Port Setup 11 18 Changing the Local Ring Section Number 11 19 Facility Table 11 20 V HIGH SPEED DEVICE MANAGEMENT 12 FDDI DEVICE MANAGEMENT Introduction 12 2 Using the Display Panel 12 2 ...

Page 9: ...CS C TECHNICAL SUPPORT On line Technical Services C 1 3Com Bulletin Board Service C 1 World Wide Web Site C 2 ThreeComForum on CompuServe C 2 3ComFacts Automated Fax Service C 3 Support from Your Network Supplier C 3 Support from 3Com C 4 Returning Products for Repair C 5 D RMON AND ADVANCED MANAGEMENT What is RMON D 1 Benefits of RMON D 2 3Com Transcend RMON SmartAgents D 2 The RMON Implementatio...

Page 10: ...rms D 8 Using Alarms D 11 Audit Log D 12 E INDEX OF MANAGEMENT ACTIONS AND DATA INDEX ELECTRO MAGNETIC COMPATABILITY STATEMENT FCC Statement 1 CSA Statement 1 European Statement 1 Information To The User 2 LIMITED WARRANTY ...

Page 11: ...I GENERAL INFORMATION ...

Page 12: ......

Page 13: ...anage the MSH chassis and other modules It includes details of management using SNMP the display panel or a VT100 terminal The guide is written for the system or network administrator who is responsible for setting up devices used on the network If you are using management on your network for the first time it is possible you will make mistakes We have tried to identify the likely errors you may m...

Page 14: ...f the MIB if this is required If the information in the release notes shipped with your product differs from the information in this guide follow the release notes Part I Tells you how install the management module and explains all the methods of managing the MSH hub It gives an introduction to management using SNMP the display panel and VT100 terminal interface Part II Tells you how to manage the...

Page 15: ...odules with the display panel Chapter 7 How to manage Ethernet modules through the VT100 interface Chapter 8 An overview of token ring networks Chapter 9 How to use the display panel for managing token ring modules Chapter 10 How to use the VT100 interface for managing token ring modules Chapter 11 The objects in the token ring Management Information Base Chapter 12 Management of High Speed device...

Page 16: ...please refer to the appropriate manual Transcend Workgroup Manager for UNIX Part No DUA2780 0AAA0X Transcend Workgroup Manager for Windows Part No DUA1500 0AAA0X Transcend Enterprise Manager for Windows Part No DUA1501 0AAA0X If you are using any other remote management software refer to the accompanying documentation and read the sections that describe how to manage SNMP devices Telnet If you wis...

Page 17: ...e messages are defined as follows Notes call attention to important features or instructions CAUTION Cautions contain directions that you must follow to avoid immediate system damage or loss of data WARNING Warnings contain directions that you must follow for your personal safety Follow all instructions carefully ...

Page 18: ...ay be shown as Return or Esc If two or more keys are to be pressed simultaneously the keys are linked with a plus sign for example Press Ctrl Alt Del Italics Italics are used to denote new terms or emphasis ADRI Advanced Distributed Recovery Intelligence AMAU Advanced Multistation Access Unit for Token Ring CRC Cyclic Redundancy Check CSMA CD Detection Carrier Sense Multiple Access with Collision ...

Page 19: ...ingBuilder Module RI Ring In port on RingBuilder Module RMON Remote monitoring RO Ring Out port on RingBuilder Module SLIP Serial Line Internet Protocol Smart Module A module capable of collecting its own statistics SNMP Simple Network Management Protocol Standby Link the normal back up link of a resilient pair Standby Port the port to which a standby link is connected TCP Transmission Control Pro...

Page 20: ...1 8 CHAPTER 1 ABOUT THIS GUIDE DUA1850 0AAA05 ...

Page 21: ...2 OVERVIEW This chapter tells you The functions of the management module The ways to manage the MSH chassis ...

Page 22: ...3C18124A 7 port TP Smart Secure Module RJ45 TCVR 3C18135A 6 port Fiber Optic Smart Secure Module ST 3C18136 6 port Fiber Optic Expansion Module ST 3C18140A 6 port Coaxial Smart Secure Module 3C18141 6 port Coaxial Expansion Module 3C18146 2 port Modular Transceiver Expansion Module 3C18200 12 port UTP MAU Module RJ45 3C18201 12 port STP MAU Module RJ45 3C18202 12 port Advanced MAU Module RJ45 3C18...

Page 23: ...version on the disk against the software version on the module The README file on the disk contains the information you need To find out the version of the image on the module install the module When the module has initialized use the display panel to access the data see Using the Display Panel on page 4 3 If the disk version is greater than the module version upgrade the new image see Upgrading t...

Page 24: ...operate on a particular ring Each ring requires a RingBuilder module installed in the chassis to interconnect the MAUs assigned to the ring and build a ring network The MAU can be assigned to a different ring by the management software For more information on the MSH backplane refer to The LinkBuilder MSH Chassis 3C18000 User Guide part number DUA1800 0AAA0X MSH Services The MSH hub replaces a num...

Page 25: ...es All three of these modules could be connected together to form one repeater service or could be used in isolation as three separate repeater services Each repeater service is equivalent to a stand alone repeater device Through software one can decide to use the modules in two separate repeater services to construct a single repeater service with more ports ...

Page 26: ...MSH Chassis User Guide DUA1800 0AAA0X the yellow LEDs will be lit and the bicolor LED will flash alternately pink and green The Status In socket allows the connection of event switches of your choice The management facility can monitor the state of these switches How to use these is described in Connecting Devices for Automatic Monitoring on page 3 12 Two RJ45 sockets are for a special feature A f...

Page 27: ... are in place in the chassis provide details of their types and versions to the management module Any changes in the number and type of the modules inserted are automatically notified also Configuration of Modules Full control of the modules is available Modules may be allocated or re allocated to a service as desired Ports may be enabled or disabled Resilient pairs of ports can be created to prov...

Page 28: ...MP or Telnet Using SLIP through a local or remote SNMP station Using a local or remote VT100 terminal with RS232 link Remote operation is over a modem link to the RS232 port You may look at the configuration of the chassis and modules using the MSH Display Panel The management module can support up to five management user sessions at the same time These may be from the display panel SLIP or Telnet...

Page 29: ...ccess Level 2 Monitor Access Level 1 Allows the user to read the status of all modules and their ports No parameters may be changed Read write access is normally required for effective RMON monitoring Default Users There are three default users for the MSH management facility You cannot delete the default users but you can and should change the password see Changing Passwords on page 5 16 If setti...

Page 30: ...o manage the MSH hub The remote network manager must be linked to an Ethernet bus to which the management module is connected in order to manage the MSH hub This link may be indirect via a bridge or router Using 3Com Network Managers Transcend network management products have MSH management options Each can access and manage the full set of features of the MSH hub For more information refer to the...

Page 31: ...T100 management interface gives a forms based structure with pre defined security levels enabling access to be restricted to particular users The management interface is available to a VT100 terminal or a PC or workstation with a VT100 terminal emulation package This interface provides many of the same features as SNMP management It must be used to configure the MSH hub before you can manage it us...

Page 32: ... remote terminal Using the MSH Display Panel The MSH display panel provides functions for monitoring the MSH status from the MSH hub itself However you cannot use this panel to configure the MSH hub Because no control is possible you do not need to log in Details of how to use the panel are given in Chapter 4 ...

Page 33: ...3 INSTALLATION This chapter explains How to install the MSH Management Module How to access the management facility ...

Page 34: ...der SELV conditions Safety Extra Low Voltage according to IEC 950 the conditions of which are maintained only if the equipment to which it is connected is also operating under SELV The MSH Management Module contains static sensitive components that can be irreparably damaged by static generated by the human body DO NOT TOUCH the components on the circuit board ENSURE that you only handle the manag...

Page 35: ...eral instructions on installing and removing modules see The LinkBuilder MSH Chassis User Guide part number DUA1800 0AAA0X The management module may be hot inserted Should you choose to hot insert the module examine the PWR LED of each module If any shows continuous pink reset the chassis immediately afterwards Resetting the MSH Chassis on page 5 26 This action will ensure that the management modu...

Page 36: ...itions on the module are indicated in the diagram opposite These are the factory settings Check that they are as illustrated The hardware links are provided to enable changes in memory capacity to be accommodated when the software is upgraded You will be informed if any links need repositioning at the appropriate time Make a note of the serial number of the module and keep it in an accessible plac...

Page 37: ...the MSH chassis the management module must be in the highest numbered slot in the chassis that is slot 11 If it is not the LED above the management module will light pink as will the LED above the highest numbered slot if that contains an ECS repeater module As you may not know what configuration you will use in the future we advise that you always install the management module in the highest numb...

Page 38: ...t with a blanking plate to maintain the circulation of cooling air and prevent the entry of dust and debris into the MSH hub 3 Holding the module by the front panel insert it into the guides and push home 4 Operate the ejectors to secure the module 5 Replace the locking bar and secure it with the screws you removed earlier The management module has a volatile RAM on board to store the configuratio...

Page 39: ...dust and debris into the chassis if you are not fitting another management module WARNING To prevent unqualified personnel gaining access to the MSH hub you must replace and secure the locking bar If necessary you can remove the management module from the chassis during normal operation Removal interrupts any management user session that may be in progress and may corrupt some traffic Connecting M...

Page 40: ...your software manuals for details Consult your supplier if you need advice If you are using a PC you need a null modem cable with an appropriate connector Whether you are using a terminal or an emulator no further setup is needed the management system automatically adjusts its speed to the baud rate of the terminal You may need to alter locally some of the terminal s RS232 port parameters to suit ...

Page 41: ...he Telnet facility if you are unsure how to do this Five users may use Telnet into the VT100 interface concurrently If the RS232 port on the MSH Display Panel is being used only four concurrent Telnet users are permitted Before you can access the management interface using Telnet you need to set the IP address for the MSH Management Module using a local terminal or BootP server To open the Telnet ...

Page 42: ...f you have no connection to other networks and are not using IP protocol for anything other than network management you may use arbitrary numbers To comply with the expected format we suggest you use numbers in the series 192 168 100 X where X is a number between 0 and 255 Use 192 168 101 X for the SLIP address Remember that no two addresses may be the same If at a later point you connect to the o...

Page 43: ...de If the module is removed from the chassis and replaced by a module of same service type the management module will recognize the module and use the backplane bus setting it has stored in NVRAM If the module is of a different service type the management module will act on the link setting When you install a module into an apparently unused slot you may not be sure whether there has been a previo...

Page 44: ... to low or low to high is held for more than ten milliseconds Transitions held for less than ten milliseconds may not be detected The traps may be enabled and disabled from the manager Using the status lines gives you the ability to monitor remotely the state of the detector Electrically the status inputs have certain requirements which the user must ensure are met CAUTION The external switches to...

Page 45: ...onnected to the same isolated 0V connection on the management module You do not have to use all four Below is a diagram showing two examples of how you can use this facility Status input 1 is connected to a thermostat status input 2 is connected to a UPS Alarm Output Figure 3 3 Example Of Using The Status Input Port Shield ...

Page 46: ...e Links on page 3 4 3 Undo the two screws securing the locking bar and lift it away from the chassis 4 Remove the blanking plate from the chosen slot of the MSH chassis 5 Insert the MSH Management Module and secure it 6 Replace the locking bar and secure with the two screws 7 Cover any open slots with blanking plates re arranging and adding if necessary 8 Check the LED functions See The Management...

Page 47: ...II CHASSIS MANAGEMENT ...

Page 48: ......

Page 49: ...4 MANAGING THE CHASSIS USING THE DISPLAY PANEL This chapter Shows you how to use the display panel to get data about the chassis ...

Page 50: ...active management module The LED will light PINK above an ECS Repeater Module if it is in the highest numbered slot The LED will light PINK above an ECS Repeater Module or a Smart Module if a standby resilient port is configured on it but the port is not set at default to disable or if the module is not connected to the same repeater service as the main resilient port The LED will light PINK above...

Page 51: ... of the MSH Display Panel which enable you to move through a menu to find and display the information you require You cannot change any setting from the display panel Figure 4 1 Display Panel The initial display gives the product name If you use Transcend Network Manager or another SNMP management application you may enter text on the second line to describe the particular unit This gives you the ...

Page 52: ...choices using the Next and Previous keys The menus wrap around from either end so that pressing Next from the last position will take you to the first position and pressing Previous at the first position takes you to the last Figure 4 3 Moving At One Level The Select pad moves you up to the previous level until you reach the initial display Figure 4 4 Up To Next Level ...

Page 53: ... Previous keys of Physical Configuration gives details of the slots occupied and the modules installed See Physical Configuration on page 4 6 Chassis Services gives you configuration and statistics information for each service present in the chassis e g each 802 3 repeater token rings etc See Chassis Services on page 4 7 Chassis Environment gives you information about the make up of the MSH hub Se...

Page 54: ...Menu Each slot choice offers you the detail shown below and in the diagram Move between the details with Next and Previous The Services Used level has a further menu which expands with the number of services allocated Module Type e g 13 port 10Base T H W Version e g 2 10 S W Version e g 1 00 Power Requirement the 5V power used by the module e g 12W Services that is Ethernet backplane bus and or To...

Page 55: ...otocols that is SNMP This is expandable to record all details of various modules present Repeater Backplane Bus Number gives access to menus which provide configuration details and repeater module and port statistics A full explanation of what is provided is contained in Chapter 7 and Chapter 8 Token Ring gives access to menus which provide details of the ring and its statistics A full explanation...

Page 56: ...u will find Chassis type Number of slots and Hardware Version Fan Configuration gives the number of fans fitted and their version number together with a status report PSU Configuration gives the type and capacity of each power unit fitted Extended Backplane Configuration details the type and version of the extended backplane if fitted Temperature Information gives a qualitative measure of the inte...

Page 57: ...Searching the Menus 4 9 DUA1850 0AAA05 Figure 4 8 Chassis Environment Menu ...

Page 58: ...4 10 CHAPTER 4 MANAGING THE CHASSIS USING THE DISPLAY PANEL DUA1850 0AAA05 ...

Page 59: ...S USING THE VT100 INTERFACE This chapter tells you how to use the VT100 interface to Set up management communications Obtain data about the chassis Control the security of the chassis Enter Ethernet or Token Ring management ...

Page 60: ...aths to the screen of your choice Each choice from the Main Menu screen is given a section Any screens which branch from a choice have their own subsections But this only applies as far as the branch into specific media management as there are dedicated manuals for these The displayed screens may not be identical to those illustrated in this chapter The contents of screens depend on the security l...

Page 61: ...escriptions of the fields given later in this chapter the default entries are underlined Entry Field Text enclosed in square brackets on the screen is an Entry Field An Entry Field allows you to enter different types of data from the keyboard This may be text numeric data or hexadecimal data Password fields are hidden This means that the text you type in is not shown on the screen Some Entry Field...

Page 62: ...he end of the list it moves the cursor to the next field Special Characters There are several special characters or combinations of characters that allow you to make shortcuts Tab allows you to move from one field to the next on any screen without making any changes Return moves you to the next field on a form after you have made changes to the data in a field Left Arrow moves you to the previous ...

Page 63: ...the cursor back one space but this is non destructive and you must type in a replacement character even if this is a space CAUTION If you are using Telnet or a terminal emulation program you may find that some of the Control keys do not operate or that they activate other functions For example the Windows terminal emulator uses Ctrl H for destructive backspace Check carefully in the manual accompa...

Page 64: ... CHASSIS USING THE VT100 INTERFACE DUA1850 0AAA05 VT100 Management Menu Map The italic number at the bottom left of a screen box is the page number where you will find the description of that function Figure 5 1 Management Menu ...

Page 65: ...rn Figure 5 2 Main Banner Screen There are two fields which you can customize using an SNMP manager sysName and ascLocalManagementBanner If this is your first time accessing the interface or after you have initialized the module you should set up the security level and password Also you will need to set up your management communications details that is IP address subnet mask trap destinations etc ...

Page 66: ...efault user name and password will depend on the access level you require The choices are detailed below At your first opportunity you should change these parameters to maintain security Figure 5 3 Logon Screen If you are recognized the facility will display the Main Menu screen shown below Table 5 1 Default User Names And Passwords User Name Password Access Level monitor monitor monitor manager m...

Page 67: ...ement facility The meaning of each should be clear If you have any difficulty the map on page 5 6 will assist you in making your decision Figure 5 4 Main Menu Screen Within this chapter the screens are described in the order we feel you will find most appropriate not in the order in the menu The LOGOFF button closes down the session allowing the interface to sleep ...

Page 68: ...lot or backplane to which it is attached Chassis Configuration displays the data of the chassis itself 802 3 Bridge is a bridge service and is an example of an Intelligent Device whose management is described in Intelligent Module Management on page 5 34 The other entries are the other services which are in the chassis Their management is described in their respective chapters Figure 5 5 Service S...

Page 69: ... Selection Menu Details of the chassis and all the modules within the chassis environment are read automatically from the hardware The data headings are Chassis Specification Fan Specification Power Supply Unit PSU Specification Extended Backplane Specification Figure 5 6 Chassis Configuration Screen The Fan and PSU Status fields will contain either operational or failure OK ...

Page 70: ...ill be allowed to use all the options If you have any other access level for instance MANAGER you will only be allowed to change your password through the EDIT USER option Select the option you require and press Return Figure 5 7 Access Level Screen The use of the four access level screens is described in the following sections Details of the access levels are given in Creating Users on page 5 12 ...

Page 71: ...ing through using the space bar Monitor This allows the user to view the essential operations of the Chassis and to establish whether or not the Chassis is operating correctly A user at this level cannot change the operating parameters of the Chassis or gain access to any of the configuration menus Secure Monitor As for Monitor above Manager This allows the user to monitor and to make changes to t...

Page 72: ...s Toggle the users you wish to delete from the List Box using the space bar They will be highlighted when they are selected Move the cursor to the DELETE USERS button and press Return You cannot delete the current user i e yourself or any of the default users If you do not wish to delete any users after entering this screen move the cursor to the CANCEL button and press Return Figure 5 9 Delete Us...

Page 73: ...you want to prevent access to the management facilities via the RS232 Management Port you can disable the facility for each access level separately Access for the Security level is permanently ENABLEd It is important that to prevent unauthorized access you set your own password Remote Telnet ENABLE DISABLE Community SNMP ENABLE DISABLE The MSH Management Module can be managed with SNMP using a rem...

Page 74: ...ires you to enter the new password twice The management facility will verify that the two entries are the same and implement the new password Figure 5 11 Edit User Setup Screen If you forget your password but are still logged on you can initialize the device See Resetting to Factory Settings on page 5 28 and the default users will be restored with their default passwords All other users will be er...

Page 75: ...screen Device IP Address You will need to enter a unique IP address for this device If you are unsure about the address consult your network administrator If you change the IP address reset the management module to effect the change See Resetting with Stored Settings on page 5 27 Device SubNet Mask Enter a suitable Sub Net Mask For a class B IP address with no sub networking 255 255 0 0 will be su...

Page 76: ... Activities Board document RFC1055 SLIP Subnet Mask Enter a suitable Sub Net Mask For a class C IP address with no sub networking 255 255 255 0 will be suitable Check with your network administrator if you are unsure You will see a default class C address displayed if you have not changed it If you change the Sub Net Mask reset the management module to effect the change BootP Select ENABLE DISABLE...

Page 77: ...field shows the IPX node address of the management module which is learned automatically Status ENABLE DISABLE This field shows whether access using the medium access protocol is ENABLEd Choose DISABLE if you wish to prevent access for any reason such as security considerations If you are not going to use IPX we recommend that you set the status field to DISABLEd If you run a token ring shared MAC...

Page 78: ...anges at the Chassis Traps are sent by the management module to a remote network manager such as Transcend Figure 5 13 Trap Destination Setup Screen The Trap Destination Setup screen is accessed via the Device Setup screen This screen requires you to complete four fields IP or IPX Address Enter the IP or IPX address of each remote network management station to which SNMP traps should be sent Commu...

Page 79: ...rottle is one milli second Setting the Serial Port Parameters If you alter the serial port parameters you will terminate any existing RS232 session with the management facility when you exit the screen Ensure that the remote end of the RS232 connection is set to the new configuration so that you will still be able to access the facility from it when you change the Serial Port parameters Figure 5 1...

Page 80: ...ed to work with your VT100 terminal The settings made by Auto Configuration are not visible to the user Set this option to ENABLEd if you require autoconfiguration When Auto Config is ENABLEd the displayed value in the Speed field is that which will be adopted when the Auto Config is next DISABLEd Speed 1200 2400 4800 9600 Select the baud rate of your terminal or modem Check in the manual for your...

Page 81: ...d press Return Select the new MAC with care If you choose a MAC with no management station attached you will lose all communication with the MSH hub A warning screen is displayed to remind you of this possibility after you request a switch You may need to switch the backplane connection first See Switching Services on the Backplane on page 5 34 Ethernet Movements on page 8 2 and Facility Table on ...

Page 82: ...nt of system resets This information may be useful to your technical support representative in the event of problems Last Reset Type This field indicates the cause of the last reset Types of Reset you may see are listed below Power Reset power was interrupted or the Reset button used Command management has called a reset Watchdog the Software has hung based on a time out Other very rare A system e...

Page 83: ...urred Your Technical Support service will need to know the number to help them identify the condition You will need to know the Software Version number if Technical Support are to help you It is intended that the information carried by this screen is meaningful only to 3Com Power Supply Problems At power up or if a module is inserted in the MSH the management module automatically assesses the tota...

Page 84: ...to the manual which accompanied that module or for repeaters and token ring to the appropriate part of this manual Persistent Data Store Most of the set parameters are saved into a Persistent Data Store PDS non volatile memory on the management module These are device name location contact MIB II display panel message facility table module service connections token ring port state ethernet port st...

Page 85: ...swap in a new management module it will be given the same IP parameters as its predecessor Resetting with Stored Settings The Reset Device function resets all counters to zero and resets the management module and all other modules contained in the chassis It does not affect any parameters in PDS such as port state alarms or IP configuration Figure 5 18 MSH Reset Screen There is also a counter rese...

Page 86: ... Factory Settings The Initialize Device function applies also to the management module It performs a reset as described above Also most of the parameters in PDS will be set back to its initial values The IP configuration will remain unchanged Figure 5 19 MSH Initialization Screen OK CANCEL ...

Page 87: ...om a remote Network Manager The protocol used for downloading is TFTP running over TCP IP or IPX and will only work inband not via the RS232 interface Set up a network linked remote TFTP server with the file in the open directory Toggle to the download type you wish to perform Enter the filename and server IP or IPX address on the Software Upgrade screen Click on the OK button Figure 5 20 Software...

Page 88: ...use the same software New versions of the Smart Module software are loaded to flash EPROM into an unused area of memory At some time in the future you may find that an attempted download is greeted with a Fail message In this case you will need to download a complete software image for both management and Smart Modules The downloading of the software for the management module is a separate operati...

Page 89: ...address of the device to be polled Round Trip Time This is the interval in milli seconds between the time the last frame was sent to the target device and the time a response was received by the management module If set the remaining time to live will be displayed also If there is no response within a few seconds no reply is shown The management module can be configured to automatically poll sever...

Page 90: ...out modules in the chassis Select the module from the list and then select what further data you need Module Configuration or Facility Table Figure 5 22 Module Configuration Menu Screen Information may be accessed about the management module itself and any other management modules that may be present Only one management module can run in the MSH chassis at a time If more than one management module...

Page 91: ...s is a read only screen This information is transferred to NVRAM Thereafter when you exchange a module the software checks the new module s data against that in NVRAM There are two possibilities The module is of the same variety as that removed and the parameters set for the previous module by the manager are retained The module is a different variety and the default parameters are applied Figure ...

Page 92: ...You will find details of the variations in the manual covering management of the network technology used by the module Intelligent Module Management If an Intelligent Service e g a bridge is selected the address table for the module is displayed It will show the MAC IP and SLIP addresses Figure 5 24 Address Table Screen Any further management will be specific to the intelligent module using its in...

Page 93: ...address of the Local Bridge Module must be of the same subnetwork as the MSH chassis otherwise you may find you are not allowed to set the IP address The solution is to change the IP address of the MSH hub to be on the same subnet as the proposed IP address of the Local Bridge Module before making a second attempt to set the latter s address Do remember to reset the MSH IP address to the original ...

Page 94: ...rnet bus or token ring To do this you route the management traffic through a suitable MAC on a different module in the chassis See Switching MACs on page 5 22 You can use any LAN for management provided that there is a suitable form of bridging or IP routing between it and Ethernet bus or token ring the management module is connected to You must ensure that there is a path between the management m...

Page 95: ...III ETHERNET MANAGEMENT ...

Page 96: ......

Page 97: ...6 INTRODUCTION TO ETHERNET MANAGEMENT This chapter Describes Repeaters Port Resilience Port Security and other features ...

Page 98: ...S Modules forming isolated repeaters or compound repeaters on the Ethernet buses to which the management module is not connected They do not provide a full set of statistics Only information on Collisions and Autopartitions is available from them A repeater service can be either a group of modules connected to an Ethernet backplane bus or an isolated repeater module A repeater module may be isolat...

Page 99: ...ent or trap will be sent to the Network Manager informing you that a main port has been disabled and a stand by port has taken over If you then rectify the fault on the main port or the fault clears the operation will switch back automatically to the main port It is important to ensure that the repeater module with the standby port has the hardware link in the correct position i e in the Resilienc...

Page 100: ...t detail is available only to SNMP management applications such as the Transcend range LSA allows only frames intended for a specified station to be received by that station All other stations receive corrupted frames This is in addition to the password protection and different access levels which are built into the management system One security element is the provision of Need to Know NTK filter...

Page 101: ... the timing parameters of the protocol Counting the frames over a fixed time enables the percentage of the maximum to be calculated You will see Bandwidth Used expressed as this percentage Load is presented at the Display Panel as a bar chart which is autoranging in one of three ranges Errors Frame This is the result of dividing the number of errors by the number of frames It is expressed in error...

Page 102: ...amines every frame that passes through the chassis It notes the number of the port the frame came through and the source address It stores the source addresses and the port number in a database Using Transcend or similar SNMP manager you can access the database The data enables you to build up a map of the network ...

Page 103: ...7 MANAGING 802 3 REPEATERS USING THE DISPLAY PANEL This chapter explains How to use the MSH Display Panel to obtain information about the repeaters ...

Page 104: ...7 2 CHAPTER 7 MANAGING 802 3 REPEATERS USING THE DISPLAY PANEL DUA1850 0AAA05 Figure 7 1 Repeater Service Display Panel Menu ...

Page 105: ...ervice see page 4 7 The method of moving through the menu is repeated here for your convenience implies using Next or Previous for moving within one level implies using Enter or Select for moving between levels You enter the Repeater Management facility by choosing one of the repeater services for example Repeater Backplane 1 At the level you have reached the wrap around menu offers you the choice...

Page 106: ...s not reported Figure 7 2 Repeater Configuration Panel Menu The bottom level window displays the port number its type media its current status disabled equals off its link status link or no_link Move to the slot whose contents you want to know with Next or Previous Use Enter to find out the device fitted For backplane bus 1 the shorthand is B1 the slot number is added thus 1 to give B1 1 For an is...

Page 107: ...essed as a percentage of bandwidth and Errors as errors per 10000 frames A description of the errors included in this statistic is given under Total Errors in Repeater Statistics on page 8 9 These parameters are smart objects Also the traffic is displayed as a bar graph The darkened portion represents the actual percentage of bandwidth used by the traffic The range of the bar chart shown on the Lo...

Page 108: ... want the data use Enter to show the statistics as figures and Next for the bar graph Figure 7 3 Repeater Statistics Panel Menu If you want to change to another repeater service within the MSH chassis return to the Service Selection level with Select Move to the required service with Next and Previous Use Enter to select the new service ...

Page 109: ...tics for another module which is part of the current repeater service use Select to return to slot level Next and Previous to move to the appropriate slot and Enter to select the module If you want to change to a module on another repeater service within the MSH chassis return to the Service Selection level with Select twice Move to the required service with Next and Previous Use Enter to select t...

Page 110: ...he current module use Select to return to port level Next and Previous to move to the appropriate port and Enter to select the port If you want to change to a port on another module of the current repeater service return to the Slot Selection level with Select twice Move to the required service with Next and Previous Use Enter to select the new slot Thereafter follow slot selection For ports on mo...

Page 111: ...2 3 REPEATERS USING THE VT100 INTERFACE In this chapter you can read about Using the management facility The difference between Repeaters Modules and Ports and how to manage them Viewing and interpreting statistics ...

Page 112: ...ncluding all the repeater modules bridges and terminal servers with the management module However you will only get the full statistics if your ECS modules and the management module are connected to Ethernet bus 1 Particular care is necessary when transferring modules to other Ethernets If there is a connection outside the MSH chassis between two backplanes transferring a module from one backplane...

Page 113: ...s well as the type of network The displayed text string will reflect this You may see either Switch to internal Backplane 0 3 or Switch to external Value 0 127 Although you can change the value this selection will have NO effect The field between the two s is toggled when highlighted using the Space Bar For Ethernet repeaters the connection number shows the backplane buses that a module is current...

Page 114: ...management by selecting a repeater service from the Service Selection Menu presented by the VT100 interface see Service Selection Menu on page 5 10 This chapter is divided into sections that cover repeater management tasks These sections broadly follow the division suggested by the Repeater menu tree which is shown overleaf to help you find the options you require The section numbers that refer to...

Page 115: ...0 Secure 12 port 10Base T Module You will see Some statistics remain at zero Some fields cannot be changed Management Levels There are three levels at which you can manage and three types of management Repeater If you manage at Repeater level you are managing a repeater which may be a complete chassis a group of modules sharing the same backplane bus or a single isolated module 802 3 Repeater Conf...

Page 116: ... There are three types of MSH repeater management Configuration These screens allow you to view how the repeater module or port is currently configured You cannot make any changes from these screens Statistics Viewing statistics on a regular basis allows you to build up a picture of how your network is performing If you keep simple daily records you will see trends emerging and soon notice problem...

Page 117: ...you wish to manage Repeater Module or Port and then how you wish to manage that level Configuration Statistics or Setup Managing the Repeater on page 8 8 describes the fields on the Repeater Management Screen and how to make the selections described above Help If you make a mistake and select the wrong type of management simply select the Cancel button on the screen to return to the Repeater Manag...

Page 118: ...buttons Service This field reports the name of the service you selected to arrive at this screen Two examples you might see are Repeater 2 for an isolated repeater in slot 2 Repeater Backplane 2 for a compound repeater whose modules are linked by Ethernet backplane 2 Modules Available This list box details the location slot and the module type Typical types would be MSH 12 port Telco UTP MSH 12 po...

Page 119: ...d are determined by the IEEE 802 3 Repeater Management standard and by 3Com enhancements to that standard The screen is updated every 3 seconds The figures against the parameters can be cleared to zero using the CLEAR COUNTERS button at the foot of the screen Figure 8 4 802 3 Repeater Statistics Menu Table 8 1 Where The Buttons Lead Button Screen Described on REPEATER STATS Repeater Statistics pag...

Page 120: ...e selected earlier is reported Definitions of the statistics are given in Appendix B Transmit Collisions statistics are not available from ECS repeaters Managing Modules Module Configuration The Module Configuration screen provides read only information It shows how the module has been setup and what is its physical configuration Figure 8 5 802 3 Module Configuration Menu The Resilience button is ...

Page 121: ...rs the button will be presented to you on the screen The buttons allow you to move to the respective screen The table below details the use of the buttons If the module you have selected to configure is either a Secure ECS Module 3C1207X with adapter or a MSH Secure Ethernet Repeater Module 3C18110 you will be presented with another button SECURITY Operating this button will take you to an 802 3 S...

Page 122: ...er is reached the counter will roll over reset automatically After this event the individual figures may give a false impression of network conditions if taken in isolation Figure 8 6 802 3 Module Statistics Screen The RESET COUNTER button will only be available to users with access levels of 3 4 or 5 Reset Counters resets the all the hardware counters to zero and should be used with caution Using...

Page 123: ... change this state Port Statistics All the information in the Port Statistics screen is read only The screen is updated every 3 seconds The displayed values can be set to zero using the CLEAR COUNTERS button at the foot of the screen This action does not affect the value of the counter Figure 8 7 802 3 Port Statistics Menu The RESET COUNTER button will only be available to users with access levels...

Page 124: ...a type of the port See Table 8 3 on page 8 15 Definitions of statistics are given in Appendix B Source Address Changes This field shows the number of different source addresses that have been received at this port If there is normally only one device connected to each port for example as with 10Base T or Fiber Optic ports it will allow you to monitor if unauthorized devices are being connected to ...

Page 125: ...s field shows the port number you selected to set up Media This field indicates the media type of the port Use the table below to determine the media type Table 8 3 Media Type Designations Designation Media Type Unknown The true state has not been determined You may see this while the device is initializing Male AUI Transceiver like connection Female AUI Standard AUI connection with no internal tr...

Page 126: ...ccess to the network You can disable ports if the users only require access to the network at set times Link Pulses 10Base T STANDARD NOT STANDARD This field is applicable to 10Base T Repeaters only Not applicable will be seen for other types of repeaters You can enable or disable the generation of link pulse signals for an individual port In an 802 3 10Base T compliant network leave this option a...

Page 127: ...d standby ports are securely disabled DUD mode must be OFF all Need to Know features must be OFF and address learning must be OFF The resilient link will not operate if you ignore these instructions You cannot change the effect of the Resilience Enable Disable link on a module through management Before you can set up resilient links you must ensure the module whose ports you want to use has its re...

Page 128: ...odule Configuration screen Current Standby Port Gives the slot and port numbers of the standby port you have set up If you have not yet set up a standby port the field will appear when you confirm the selection of a standby port Standby Port Gives the slot and port numbers of the ports which can take part in resilience i e are disabled Select one using the Space Bar Confirm your selection with the...

Page 129: ...ide the main standby designation above and activate the standby port Toggle with the Space Bar Pair Enable NO YES Toggle the field with the Space Bar to decide whether the chosen pair behave resiliently or not Table 8 4 Media Type Abbreviations Abbreviation Media Type Unshielded Twisted Pair 10Base T unshielded connection Twisted Pair Shielded unshielded 10Base T connection Fiber 10Base FL connect...

Page 130: ...8 20 CHAPTER 8 MANAGING 802 3 REPEATERS USING THE VT100 INTERFACE DUA1850 0AAA05 ...

Page 131: ...IV TOKEN RING MANAGEMENT ...

Page 132: ......

Page 133: ... RING MANAGEMENT This chapter Provides a brief overview on token ring architecture Describes the MSH RingBuilder MAUs Local Ring Sections and Token Ring Services Describes the connection of token rings outside the MSH chassis ...

Page 134: ... 10 Introduction to Token Ring Architecture A token ring consists of a number of stations connected together in a logical ring Figure 9 1 shows a simple ring of 4 stations with the ring passing directly from station to station Figure 9 1 A Simple Ring This logical ring is physically configured as a star to improve systems resilience and management control using one or more Multiple Access Units MA...

Page 135: ...y of a star Figure 9 2 Physical Connection Of Simple Ring A larger more complex token ring network can be designed using MAU modules which can be installed in a central hub device such as the MSH chassis to allow several MAUs to form a single token ring Figure 9 3 shows a ring of 12 stations connected to an MSH 12 port Token Ring MAU ...

Page 136: ... ring product range contact your local MSH supplier MSH token ring products enable network operations personnel to configure and operate token rings in a flexible manner that suits the day to day operational needs without having to move any physical connections The RingBuilder and management module are important elements in the MSH token ring product range The RingBuilder organizes selected MAUs t...

Page 137: ...hey need to be connected Some modules for example bridges will connect into several local ring sections each controlled by a different RingBuilder The function of the RingBuilder is to search the chassis for modules which have a local ring section number that match that assigned to the RingBuilder and to create a single ring from those modules The RingBuilder provides external connections through ...

Page 138: ... that station is removed physically from the ring The port will then be re enabled Enabled with lock The port with the faulty station attached is disabled and will remain so after the station is removed from the ring Management from the VT100 interface can re enable the port Figure 9 4 shows two RingBuilders within an MSH chassis RingBuilder1 has its Ring In and Ring Out ports connected to an exte...

Page 139: ...rtant to understand the role played by the MACs that are installed on the RingBuilder A MAC Media Access Control is the means by which frames are received and transmitted onto the token ring Each RingBuilder has at least one MAC device MAC1 which collects statistics and may be used to pass management frames between the management module in the chassis and the RingBuilder s token ring MAC1 is alway...

Page 140: ...ment commands for example via VT100 management see Port Setup on page 11 18 the ports of an MSH MAU may be disabled This allows for the easy removal of potentially faulty stations from the ring or allows maintenance work to be carried out in a non disruptive fashion MSH Token Ring AMAUs The AMAU Advanced Multistation Access Unit offers all the functionality of a standard MAU plus Advanced Distribu...

Page 141: ...ly supports token ring the management module will need to manage over token ring by sharing the RingBuilder s MAC device See Token Ring Only Networks on page 11 3 CAUTION Reconfiguring your token ring may cause loss of communication between the management station and the LinkBuilder MSH Chassis if the RingBuilder is sharing its MAC with a management module Other Token Ring Components Token ring de...

Page 142: ...rvention will be required to change the local ring section number of RingBuilder2 see Facility Table on page 11 20 The next configuration see Figure 9 6 shows how the previous system can be reconfigured if one of the MAUs needs to be operated as a separate ring In addition the MAU nearest to the management module has been isolated from the backplane Figure 9 6 Internal Rings And Isolated Ring ...

Page 143: ...ch form a local ring section or a single isolated RingBuilder All the modules in a service share a common local ring section number Up to 5 such local ring sections may operate within the MSH chassis The local ring section to which a MAU or RingBuilder is assigned is set via switches on each module However this setting can be overridden by management command for example through VT100 management se...

Page 144: ...RingBuilder can monitor the operation of the external ring Isolated Token Ring MAUs A MAU is isolated when its local ring section number does not match that of a RingBuilder or when its local ring section number is Zero Isolated MAUs do not communicate with any other module in the MSH chassis Instead the MAU connects the output from its last port to the input of its first port so that the stations...

Page 145: ...and for example VT100 management see Changing the Local Ring Section Number on page 11 19 Position Dependence While all slots in the chassis are equal there are some important points to be aware of with regard to the position of modules within the chassis The RingBuilders are totally position independent their configurations are set either by switches or through management commands see Token Ring ...

Page 146: ...l part of the ring As an example the figure below shows an MSH chassis with the following modules installed slot 11 holds an MSH Management Module slot 5 holds a RingBuilder Module which has been assigned to local ring section 2 slots 1 7 and 10 hold token ring MAU modules which also have been assigned to local ring section 2 slots 2 and 9 hold token ring MAU modules which have been isolated from ...

Page 147: ...t the bottom port of the MAU in slot 1 the frames pass back to the RingBuilder and out to the external part of the ring via the Ring Out port Extending the Local Ring Section The RingBuilder Module has a Ring In port and Ring Out port to facilitate connection to token ring sections external to the chassis These ring sections may be located in other MSH chassis or comprise other compatible token ri...

Page 148: ...ection by selecting the FAIL SAFE mode for the Ring In and Ring Out ports see RingBuilder Modes on page 9 15 Figure 9 11 Normal RingBuilder Mode The figure above shows the internal connections in the RingBuilder when operating in the NORMAL mode REPEATER mode In the REPEATER mode the main path of the external ring bypasses the RingBuilder s Local Ring Section thereby isolating the RingBuilder s lo...

Page 149: ... to extend the token ring away from the MSH chassis it is important to protect the operation of the chassis service from problems occurring in the external trunk cabling or in other equipment The MSH RingBuilder is designed to provide this protection through resilience related features which are designed to allow the ring to be re routed under fault conditions These features are set by the modes o...

Page 150: ...der Mode If the Ring In and Ring Out ports are set to OPEN and the ring becomes broken possibly through a bad connection to a port the Main Ring state will change to BEACON see RingBuilder Setup on page 11 7 indicating that the ring is broken You will have to manually change the mode of the Ring In and Ring Out port to WRAPPED in order to isolate the fault from the ring and enable the ring to oper...

Page 151: ...o remove a RingBuilder from the ring for maintenance purposes without interrupting the external ring or to temporarily return the ring to normal operation while a faulty trunk cable or a connector is replaced This can be achieved by wrapping both the Ring In and Ring Out ports See figure below Figure 9 15 Using Wrapped Mode To Isolate MSH Resident Devices ...

Page 152: ... RingBuilder is connected to other RingBuilder Module s or other LinkBuilder token ring products that support a dual ring Ring Topology and Sizing Cable type ring speed and ring topology affect the performance of the token ring Using management commands to change port configurations will affect the ring topology You may experience a detrimental effect on ring performance unless you properly consid...

Page 153: ... and Backup Rings using STP Type 1 cabling Wrapping of the ring at the Ring In and or Ring Out ports of the RingBuilder does NOT affect these values including situations when the RingBuilder has lost power Lobe Cables The maximum lobe lengths permitted in token rings are shown in the table below The values refer to the longest path that may be found in a token ring without passing through any acti...

Page 154: ...MAUs Cable Type Ring Speed Mbps Maximum Lobe Length m ft STP IBM Type 1 4 300 1000 16 300 1000 UTP level 3 4 130 430 16 70 230 UTP level 4 4 200 660 16 140 460 UTP level 5 4 200 660 16 190 630 Table 9 3 Ring Speed And Cable Length For Lobe Cables Using AMAUs Cable Type Ring Speed Mbps Maximum Lobe Length m ft STP IBM Type 1 4 600 2000 16 300 1000 UTP level 3 4 200 660 16 100 230 UTP level 4 4 400 ...

Page 155: ...10 MANAGING TOKEN RINGS USING THE DISPLAY PANEL This chapter Explains how to obtain information on token rings within the MSH chassis using the display panel ...

Page 156: ...ng whether a break has been detected Ring Configuration on page 10 6 Soft error counts both on the ring and at the ring stations Ring Statistics on page 10 8 and Ring Station Information on page 10 9 Using the display panel you can only view data you cannot configure or control the token rings The figure opposite shows the menu tree structure available from the display panel for token ring managem...

Page 157: ...Introduction 10 3 DUA1850 0AAA05 Figure 10 1 Display Panel Token Ring Service Menu ...

Page 158: ... Having selected a token ring service the display will then show a wrap around menu offering you the following facilities Ring Status Ring Configuration Ring Statistics Ring Station Information The following sections explain how to use each facility An isolated RingBuilder Module local ring section number set to zero can still be monitored through the display panel The RingBuilder will be displaye...

Page 159: ...vice in the MSH chassis Figure 10 2 Ring Status Menu The bottom level window displays the status of the token ring Mode is either Normal or Beacon Normal the ring is operating normally Beacon beacon frames have been detected on the ring indicating that the ring is broken or that a station thinks the ring is broken ...

Page 160: ...e type RB RingBuilder MAU Module AMAU Module Slot y y is a number between 1 and 11 This is the slot in the MSH chassis occupied by the module The bottom level displays information on the module selected at the previous level RB Module R In R Out Open Wrap This is the state of the Ring In and Ring Out ports on the RingBuilder For an explanation of the Ring In and Ring Out states refer to Extending ...

Page 161: ...f cable connecting the ring station to the port on the module State Enabled Disabled This shows whether the port is enabled or disabled The port state can be changed through VT100 management see Port Setup on page 11 18 or remote management Phantom Present Absent This indicates whether or not the phantom signal has been detected at the port ...

Page 162: ...e ring or receive buffer overflows Figure 10 4 Ring Statistics Menu Soft Errors The value consists of the total number of isolating soft errors soft errors which are traceable to a station that were collected and reported by all the stations on the ring since the last soft error report was made Frequent soft errors may result in degraded ring performance If you notice a significant increase in sof...

Page 163: ...atistics on page 10 8 Figure 10 5 Ring Station Information menu The bottom level window displays the soft error value for the ring station with the selected MAC address Soft Errors The value consists of the total number of isolating soft errors collected and reported by the station on the ring since the last soft error report was made Frequent soft errors may result in degraded ring performance If...

Page 164: ...10 10 CHAPTER 10 MANAGING TOKEN RINGS USING THE DISPLAY PANEL DUA1850 0AAA05 ...

Page 165: ...11 MANAGING TOKEN RINGS USING THE VT100 INTERFACE This chapter explains how to Use the VT100 interface to manage your token ring Adapt the MSH Management Module to a token ring only environment ...

Page 166: ...ge 11 3 view the operational state of a selected service see page 11 7 set the operating mode for the RingBuilder and its Ring In and Ring Out ports see page 11 7 display MAC addresses on the selected ring and on the RingBuilder see page 11 10 display the ring topology see page 11 12 display statistics at a global ring level see page 11 11 or at a station level see page 11 13 display the type and ...

Page 167: ...using the MSH chassis in an environment which has only token ring networks remote management of the MSH hub will need to take place over token ring This will require you to alter the configuration of the MSH Management Module By default the MSH Management Module expects to use its own internal Ethernet MAC connected to the Ethernet bus E1 To manage the MSH over token ring you need to direct the ma...

Page 168: ...hared Service Displays the name of the service to which the identified module belongs To change the MAC used by the management module follow these steps 1 Select the particular MAC by using the cursor key to move to the appropriate MAC Then press the space bar to make the selection 2 Press Return to move to the SWITCH button The SWITCH button will only be displayed if you are using access level 5 ...

Page 169: ...on another RingBuilder Module in a different slot unless reconfigured through VT100 If a working RingBuilder is installed in the same slot as the original RingBuilder the management module will start to share the MAC once the RingBuilder has initialized If an MSH chassis containing a management module configured to share a RingBuilder MAC is powered down and the Ring Builder has been removed or is...

Page 170: ...u to setup and monitor the token ring service that you have selected Figure 11 3 Ring Configuration Screen To give you an overview of the menu structure the token ring menu tree is shown on the previous page The section numbers that refer to each menu option are shown in italics on the menu tree To manage a different token ring service return to the Service Selection menu and repeat the process An...

Page 171: ... RingBuilder MAC Addresses on page 11 10 Figure 11 4 RingBuilder Setup Screen Main Ring State Normal Beacon These indicate the Operational State of the Main Ring Normal The ring is operating normally Beacon There are beacon frames on the ring This may indicate a hardware fault on the ring for instance a faulty connection or a faulty ring station adapter Use the Ring Statistics menu to determine th...

Page 172: ...r more information on wrapping these ports refer to Extending the Local Ring Section on page 9 15 Ring Wrap State Normal Wrapped Not Available This field indicates whether the ring is operating normally or has wrapped providing that MAC2 is installed on the RingBuilder The message NOT AVAILABLE will be displayed if MAC2 has not been installed The ring will wrap automatically in response to a break...

Page 173: ...ingBuilder Ring In Ring Out Ports on page 9 17 for more details The OPEN mode is compatible with IBM 8228 non managed passive MAUs Great care should be taken when Wrapping both Ring In and Ring Out ports at the same time as this will remove the RingBuilder and its local ring section totally from the external ring The RingBuilder will still operate normally with its local ring section RingBuilder M...

Page 174: ...e RingBuilder Setup screen The screen will display the MAC addresses of the RingBuilder assigned to the selected service Figure 11 5 RingBuilder MAC Addresses Screen The MSH RingBuilder supports up to two MAC devices one MAC as standard on the module and a second optional device which can also be fitted to the module The RingBuilder MAC addresses are displayed in non canonical form the format used...

Page 175: ...ve been collected and reported by all the stations on the ring Isolating soft errors are traceable to the ring station reporting them The ring expects to operate normally with a level of soft errors from which stations are able to recover An abnormal rise in soft errors should be regarded as a warning to investigate Active Monitor Changes This indicates the number of times that standby monitors ha...

Page 176: ...LL of the counters on the RingBuilder Module but use it with caution it will affect gathering remote statistics The maximum value the counters can hold is 4 294 967 295 or 232 1 after which they will wrap around to 0 Ring Topology This screen displays the ring topology of the selected service The ring topology is shown by the relative position of the MAC addresses on the ring see Station Sequence ...

Page 177: ...ngBuilder and going around the external ring to the station before the Ring In port Next the addresses of stations on the MAUs in the local ring section are shown These start with the address of the station connected to the MAU in the highest numbered slot See Station Location on a Local Ring Section on page 9 13 for an explanation of the MAU sequence The current active monitor is indicated by the...

Page 178: ...ion 3 Move to the STATISTICS button and press Return The statistics are updated every 2 seconds Station State Present Indicates that the station whose MAC address has been specified is currently inserted into the ring Absent Indicates that the station whose MAC address has been specified is currently NOT inserted into the ring The maximum value the following counters can hold is 4 294 967 295 or 2...

Page 179: ...he ring Lost Frames This is the count of the number of frames that were sent by the station and did not return In normal operation frames sent by a station pass all the way around the ring back to the sending station which is responsible for removing the frames from the ring Location This is the Physical Location Number that MAY have been set for the station via a ring parameter server or from LAN...

Page 180: ...w The ring expects to operate normally with a level of soft errors from which the station is able to recover An abnormal rise in soft errors should be regarded as a warning to investigate BUTTONS CLEAR COUNTERS Clears the counters displayed on the screen Use this button to see how quickly the counters are changing over a particular period of time This button does not affect the counters on the Rin...

Page 181: ...dule Setup To setup a MAU module on the ring 1 Select a MAU from the Ring Module Status screen using the cursor keys and space bar 2 Move to the SETUP button and press Return A screen similar to Figure 11 10 will be displayed Figure 11 10 Module Setup Screen SETUP OK PORT SETUP OK ...

Page 182: ...om a port which has the Admin state set to Disabled a trap will be sent to the Network Manager Attach state Present A phantom signal has been detected by the port indicating that the station is requesting to be attached to the ring Absent Indicates a phantom signal has not been detected and therefore the station is not connected to the ring ZDL state Not supported The MAU is standard Disabled Enab...

Page 183: ...r on page 9 5 and MSH Token Ring AMAUs on page 9 8 If ZDL disables a port the Admin State will still show ENABLED 5 ZDL can be controlled by toggling the value through Disabled or Enabled ZDL is described in MSH Token Ring AMAUs on page 9 8 ZDL is not supported by the standard MAU The ZDL field on this screen will not be shown Changing the Local Ring Section Number LinkBuilder MSH Token Ring produ...

Page 184: ...hich have the local ring section number set to 0 will be isolated from the MSH backplane You will therefore need to change this ring section number if you want the modules to form part of a larger token ring network Isolated RingBuilders and isolated MAUs are displayed with the slot number that they occupy within the MSH chassis for example RingBuilder 4 or TR MAU 12 UTP 3 Facility Table You switc...

Page 185: ...to this field Enter the change with the SWITCH button Press Return when asked to confirm the choice The text of the Switch to field depends on the type of module see the table below Modules may be allocated to new local ring sections by setting new local ring section numbers in the Facility Table The range of choice is given in square brackets Table 11 1 Text Dependant On Module Module Facility Ta...

Page 186: ...et on the RingBuilder Therefore you must take care when switching MAUs between RingBuilders If the chassis LED above the slot changes to pink the MAU has been isolated This can be because the incorrect ring speed has been set If a MAU has been isolated because the wrong ring speed was set by the speed selection link you cannot use management to reset the ring speed If you want the MAU in the ring ...

Page 187: ...V HIGH SPEED DEVICE MANAGEMENT ...

Page 188: ......

Page 189: ...12 FDDI DEVICE MANAGEMENT This chapter Describes the part of the management module in the management of 3Com s FDDI devices ...

Page 190: ...with the relevant information If an intelligent device is selected from the Module Configuration menu the Address Table will be displayed with the appropriate MAC IP addresses The Facility Table screen will display the backplane connections and the SWITCH button will allow you to change the device to another backplane Selection of the MANAGE button from the Module Configuration menu will pass cont...

Page 191: ...the same link settings been assigned the same ring numbers the RingBuilder which came up first will assume the ring number the other will reboot and remain rebooting until management assigns it to another ring This will always have the lowest available ring number FDDI 4 Port module 3C18300 and FDDI 6 Port module 3C18301 are managed by the associated FDDI RingBuilder LinkSwitch 1200 FDDI module To...

Page 192: ...ted internally to a backplane If the LinkSwitch module is in the next highest slot to an FDDI RingBuilder module internal connection is logically associated with the ring created by the FDDI RingBuilder module If the LinkSwitch module is not in the correct slot the internal connection will be considered as isolated If the FDDI Port connection has been made external the connection number will be 0 ...

Page 193: ...VI APPENDICES ...

Page 194: ......

Page 195: ...s The LinkBuilder MSH Management Module has been designed to meet the following standards Reliability MIL HDBK 217F Notice 1 Safety UL1950 EN 60950 CSA 22 2 950 EMC FCC Part 15 Class A EN 55022 level A EN 50082 1 IEC 801 parts 2 5 Vfg 243 CSA C108 M1983 Class A Environmental EN60068 IEC 68 ...

Page 196: ...ower Consumption 5Volts 3 9A 12Volts 0 2A Power Dissipation 22 watts 75 BThU hr Cable Pin Outs This section shows the pin outs for the Management Terminal cable used to connect a terminal PC or modem to the RS232 Management port Null Modem Cable Figure A 1 RS 232 25 pin To RS 232 25 pin Screen TxD RxD RTS Ground CTS DSR DCD DTR 1 2 3 4 7 5 6 8 20 1 3 2 4 7 20 5 6 8 Screen RxD TxD RTS Ground DTR CT...

Page 197: ...rt 25 pin male DCD RxD TxD DTR Ground DSR RTS CTS RI 1 2 3 4 5 6 7 8 9 DTR TxD RxD CTS Ground DSR RTS DCD RI 20 2 3 5 7 6 4 8 22 n c n c n c n c only required if screen always required required for handshaking Screen TxD RxD RTS CTS DSR Ground DCD DTR 1 2 3 4 5 6 7 8 20 1 2 3 4 5 6 7 8 20 Screen TxD RxD RTS CTS DSR Ground DCD DTR RS 232 V 24 Management Port 25 pin male Modem Port 25 pin female ...

Page 198: ...PIN OUTS DUA1850 0AAA05 Status In Connector The pin designations of the connector are given below Figure A 4 Status In Socket The EXTOUTx pins are connected to the same isolated 0V connection on the Management Module You do not have to use all four ...

Page 199: ...r or adapter card of the device connected to the problem port If the card appears to be operating correctly check the cable and cable connections for breaks or damage Auto Partitions The number of times the port or ports have automatically partitioned Autopartitioning occurs when excessive more than 64 consecutive collisions occur at a port Autopartitioned ports are automatically reconnected when ...

Page 200: ...k CRC test The number of FCS errors should be a very small percentage of the total data traffic Check the transceiver or adapter card of the device connected to the port that is the source of the problem If the card appears to be operating correctly check the cable and cable connections for breaks or damage Occasionally the problem may be caused by interference from other cables or machinery Good ...

Page 201: ...llisions and will be propagated around the network This is a normal part of CSMA CD operation and is not an error Short Events Short Events are smaller than runt frames and are errors They may indicate externally generated noise causing problems on the network Check the cable routing and re route any cabling which may be affected by external noise sources Too Long Frames Too Long Frames are frames...

Page 202: ...the network and are detected at the repeater Collisions are a normal part of 802 3 operation and are not errors Transmit collisions form part of the Total Collisions figure Unicast Frames This is the total number of frames addressed to a single MAC address that is a single device seen at the repeater module or port Very Long Events A very long event is an event that will cause Jabber Lock Up prote...

Page 203: ...mated fax service 3Com Bulletin Board Service 3ComBBS contains patches software and drivers for all 3Com products as well as technical articles This service is available via modem or ISDN seven days a week 24 hours a day Access by Modem To reach the service by modem set your modem to 8 data bits no parity and 1 stop bit Call the telephone number nearest you Country Data Rate Telephone Number Austr...

Page 204: ...ws releases selected articles from 3TECH 3Com s award winning technical journal and more ThreeComForum on CompuServe ThreeComForum is a CompuServe based service containing patches software drivers and technical articles about all 3Com products as well as an interactive forum for technical questions To use ThreeComForum you need a CompuServe account To use ThreeComForum 1 Log on to CompuServe 2 Ent...

Page 205: ...etwork Supplier If additional assistance is required contact your network supplier Many suppliers are authorized 3Com service partners who are qualified to provide a variety of services including network planning installation hardware maintenance application training and support services Country Fax Number Hong Kong 852 2537 5610 U K 44 1442 278279 U S 1 408 727 7021 Country Fax Number Country Fax...

Page 206: ...all 800 876 3266 for customer service If you are outside the U S and Canada contact your local 3Com sales office to find your authorized service provider These numbers are toll free Country Telephone Number Country Telephone Number Australia Sydney 61 2 959 3020 Japan 81 3 3345 7251 Melbourne 61 3 653 9515 Mexico 525 531 0591 Belgium 0800 71429 Netherlands 06 0227788 Brazil 55 11 546 0869 Norway 8...

Page 207: ...thorization RMA number A product sent to 3Com without an RMA number will be returned to the sender unopened at the sender s expense To obtain an RMA number call or fax 10 17 95 Country Telephone Number Fax Number U S and Canada 800 876 3266 option 2 408 764 7120 Europe 31 30 60 29900 option 5 44 1442 275822 Outside Europe U S and Canada 1 408 492 1790 1 408 764 7290 ...

Page 208: ...C 6 APPENDIX C TECHNICAL SUPPORT DUA1850 0AAA05 ...

Page 209: ...with the Probe and collects the summarized data from it The console does not have to be on the same network as the probe and can manage the probe by either in band SNMP or out of band connections The IETF defines the following groups of information supplied by ethernet RMON probes Statistics Total LAN statistics at any instant History Time based statistics for trend analysis Alarms Triggered when ...

Page 210: ... informs the network management console directly when the network has entered an abnormal state The console can then use more information from the probe such as history information and packet capture to perform additional diagnoses 3Com Transcend RMON SmartAgents However RMON does require one probe per LAN segment segments are separated by bridges or routers and stand alone RMON probes have tradit...

Page 211: ...to ping another device on the network and record the response time An RMON Alarm can be associated with that response time so that when the response time from the server is poor because of an overloaded server or faulty cable the hub can inform the network administrator automatically additional Actions on Event are also available when alarm thresholds are exceeded to automatically disable ports bl...

Page 212: ...all interfaces learn all the hosts on interface 1 Table D 1 RMON Group Configurations Group Initial Configuration Effect of Reset on Configuration Ethernet Statistics 1 session monitoring the Ethernet repeater traffic default restored Stats History 2 default sessions a 30 second intervals 120 historical samples stored b 30 minute intervals 96 historical samples stored default restored Host Table 1...

Page 213: ...ed to that backplane The RMON probe on Smart ethernet modules will provide the first seven RMON features However filter and capture features are implemented on the management module This restricts their use to the backplane to which the management module is connected You can change the backplane connection See Switching Services on the Backplane on page 5 34 RMON will run slower if there is an ECS...

Page 214: ...odule is the only remaining one on a backplane or is isolated the associated RMON sessions are deleted Otherwise the effect is a sudden decrease in the RMON statistics caused by removing one data source from the backplane group Switching a Smart Module to Another Backplane The effect is the combination of the two above Statistics for both backplane groups will change abruptly Switching a Managemen...

Page 215: ...r be updated When using the counters it is better to employ differences between values rather than spot values By using values at fixed time intervals the rates of change of the counters can be derived The time intervals can be as short or as long as you find convenient These rates will be more meaningful than spot values and may be compared to provide more useful data There is a sound reason for ...

Page 216: ...preset time interval It remembers the high and low tide marks and it can take actions when the value of the counter has crossed preset thresholds The diagram below shows the variation of a typical counter with time Figure A 5 Counter Values During Autosetting Of Thresholds Alarm thresholds may be autocalibrated or set manually Autocalibration is a means of calculating alarm thresholds specific to ...

Page 217: ...ssociated with the high threshold and the other with the low threshold Whether an action is taken depends on the circumstances surrounding each crossing of a threshold The numbered paragraphs below describe the conditions applying at the points correspondingly numbered in the diagram 1 The running value has exceeded the high threshold If an action has been assigned to the high threshold that actio...

Page 218: ...ds Notify and disable port Send Trap Turn port off Notify and enable port Send Trap Turn port on Blip port Turn port off Turn port on after 5 seconds Disable port Turn port off Enable port Turn port on Notify and switch resilient port Send Trap If port is the Main of a resilient pair then switch to standby Notify and blip module Send Trap Turn all ports on module off Turn ports back to original st...

Page 219: ...eleted by a user The default values are given in the table below Once alarms have been set up on a module in a particular slot they will be retained against that slot in any new configuration This situation may be made clearer by the following examples If a module is removed and replaced by a similar module the alarms will be retained on the new module If a module is swapped to another repeater ba...

Page 220: ...reventing the storm from reaching the rest of the network Audit Log The management module keeps an audit log of all management user sessions providing a record of changes to the configuration database MIB The log can be read only by a manager at the security i e highest access level using an SNMP network manager Each entry in the log is in the format Entry number timestamp user ID item ID includin...

Page 221: ...opics The Key column contains a code letter for the type of parameter presented The meanings of these code letters is tabulated below The Page column gives the page number in the current user guide where the use of the parameter is described The Screen column gives the title of the screen where the parameter appears The italics in parenthesis in the table are clarification of the parameter Smart S...

Page 222: ...oadcast secure modules C 8 11 802 3 Security screen not illustrated Allow Multicast secure modules C 8 11 802 3 Security screen not illustrated Area of fault R 5 25 Fault Log Attach State R 11 17 Ring Module Setup Attach State R 11 18 Port Setup Autoconfig uration C 5 17 RS232 Setup Screen Autopartitions R 8 9 802 3 Repeater Statistics Autopartitions R 8 12 802 3 Module Statistics Autopartitions R...

Page 223: ...nity String C 5 16 Change Password Screen Community String E 5 12 Create Users Screen Community String E 5 20 Setup Traps Screen Community SNMP Security C 5 14 Local Security Screen CONFIRM B 8 17 802 3 Resilience Connection Number R 8 2 Facility Table Connection Number R 11 20 Facility Table Connection Type C 5 21 RS232 Setup Screen CREATE USERS B 5 12 Security Menu Current Standby Port R 8 17 80...

Page 224: ...ble Facility Type R 11 20 Facility Table Fan Status R 5 11 Chassis Configuration Screen Fan Version R 5 11 Chassis Configuration Screen FAULT LOG B 5 25 MSH Status Menu Fault Number R 5 25 Fault Log FCS Errors R 8 9 802 3 Repeater Statistics FCS Errors R 8 12 802 3 Module Statistics FCS Errors R 8 13 802 3 Port Statistics Filename E 5 29 System Loader Flash EPROM Software Revision R 5 24 MSH Statu...

Page 225: ...2 3 Security screen not illustrated Line Errors R 11 13 Ring Station Statistics Link R 8 10 802 3 Module Configuration Link Pulse C 8 14 802 3 Port Setup Local Ring Section R 11 6 802 5 TR Configuration Local Ring Section R 11 7 RingBuilder Setup Local Ring Section R 11 11 Ring Statistics Local Ring Section R 11 12 Ring Topology Local Ring Section R 11 16 Ring Module Status Local Ring Section R 11...

Page 226: ...nfiguration Module S 5 32 Module Configuration Menu MODULE B 8 8 802 3 Repeater Configuration MODULE CONFIGURATION B 5 9 Main Menu MODULE CONFIGURATION B 5 32 Module Configuration Menu MODULE STATS B 8 8 802 3 Repeater Configuration Module Status R 5 33 Module Configuration Screen Module Type R 5 33 Module Configuration Screen Module Type R 8 2 Facility Table Module Type R 8 8 802 3 Repeater Confi...

Page 227: ...tion Screen Number of Resets R 5 24 MSH Status Screen Number of Slots R 5 11 Chassis Configuration Screen Pair Enable C 8 17 802 3 Resilience Pair State R 8 17 802 3 Resilience Parity C 5 17 RS232 Setup Screen Partition R 8 10 802 3 Module Configuration Password E 5 8 Logon Screen Password E 5 12 Create User Screen Password E 5 16 Change Password Screen Port R 8 10 802 3 Module Configuration Port ...

Page 228: ...le Configuration Repeater Service R 8 12 802 3 Module Statistics Repeater Service R 8 13 802 3 Port Statistics Repeater Service R 8 14 802 3 Port Setup Repeater Service R 8 17 802 3 Resilience REPEATER STATS B 8 8 802 3 Repeater Configuration Reset Count R 5 25 Fault Log RESET COUNTERS D 8 9 802 3 Repeater Statistics RESET COUNTERS D 8 12 802 3 Module Statistics RESET COUNTERS D 8 13 802 3 Port St...

Page 229: ...een not illustrated SECURITY B 5 9 Main Menu SECURITY secure modules B 8 10 802 3 Module Configuration Security smart secure modules C 8 16 Port Setup Serial Port Security C 5 14 Local Security Screen SERIAL PORT B 5 17 MSH Setup Screen Server IP Address E 5 29 System Loader Service of MACs R 5 34 Address Table Screen Service R 8 8 802 3 Repeater Configuration SERVICE SELECTION B 5 9 Main Menu Ser...

Page 230: ...mber R 11 17 Ring Module Setup Slot Number R 11 20 Facility Table Soft Errors R 11 11 Ring Statistics Soft Errors R 11 13 Ring Station Statistics Software Version R 5 32 Module Configuration Screen Source Address Changes R 8 13 802 3 Port Statistics Speed serial line C 5 17 RS232 Setup Screen Standby Port C 8 17 802 3 Resilience Station State R 11 13 Ring Station Statistics STATISTICS B 11 12 Ring...

Page 231: ...tatistics Tx Collisions R 8 9 802 3 Repeater Statistics Unauthorized Device Action secure modules C 8 11 802 3 Security screen not illustrated Unicast Frames R 8 9 802 3 Repeater Statistics Unicast Frames R 8 12 802 3 Module Statistics Unicast Frames R 8 13 802 3 Port Statistics User List S 5 14 Delete Users Screen User Name E 5 8 Logon Screen User Name E 5 12 Create User Screen User Name E 5 16 C...

Page 232: ...E 12 APPENDIX E INDEX OF MANAGEMENT ACTIONS AND DATA DUA1850 0AAA05 ...

Page 233: ...switching 5 34 8 2 switching modules on 8 2 token ring 2 4 backup ring 9 6 state 11 8 bandwidth 6 5 bandwidth used B 1 beacon 9 6 9 18 10 5 11 7 count 11 11 blanking plate 3 6 3 7 broadcast frames B 1 bulletin board service C 1 burst errors 11 15 button addresses 11 7 11 10 cancel 5 19 delete users 5 14 enter 4 3 next 4 4 OK 5 3 previous 4 4 select 4 3 serial port 5 20 setup traps 5 20 shared MAC ...

Page 234: ...onfiguration 7 4 ethernet menu 7 2 statistics 7 5 down arrow 5 4 download 12 2 DRI 9 6 DUD 6 4 8 17 E end station tracking 6 6 entry correction 5 5 field 5 3 errors burst 11 15 frame copy 11 15 frequency 11 16 internal 11 15 line 11 14 monitor 11 15 soft 10 2 10 8 11 11 11 16 token 11 16 errors 10000 packets B 2 EST 6 6 ethernet 1 2 backplane 8 2 LinkSwitch 12 4 switching 8 2 external ring 9 6 F f...

Page 235: ...local ring section number 9 5 11 19 local security See Default Paragraph Font security local local terminal 5 15 location 11 15 locking bar 3 6 3 7 logical ring 9 2 lost frames 11 15 LSA 6 4 M MAC 9 7 MAC address 3 11 5 17 main port 8 18 main ring 9 6 management 8 6 bus 5 36 information base 2 11 MIB 2 8 module 2 3 8 6 9 9 port 8 6 remote 3 10 repeater 8 5 telnet 2 11 token ring 10 2 11 2 types 8 ...

Page 236: ...n 5 16 phantom 9 8 10 7 11 18 pin outs A 2 port 8 6 8 14 configuration 8 7 FDDI 12 4 main 8 18 serial 2 8 standby 8 18 state 8 16 status in 2 6 3 12 power LED 2 6 PWR LED 2 6 R receive congestion 11 15 removing the module 3 7 repeater 6 2 8 5 configuration 8 7 8 8 management 8 5 statistics 8 9 reset 5 26 8 10 8 13 counters 8 12 8 13 reset count 5 24 reset counters 11 12 11 16 resilience 8 17 resil...

Page 237: ...IP 2 8 subnet mask 3 9 5 18 SLIP address 3 9 3 10 5 18 slot choosing 3 5 slot number 10 2 12 4 smart object 6 5 7 5 D 11 SNMP 2 8 3 9 soft errors 10 2 10 8 11 11 11 16 software version 2 3 source address changes 8 14 last 8 14 space bar 5 4 special characters 5 4 standards A 1 standby port 8 18 star topology 9 2 state admin 11 18 attach 11 18 backup ring 11 8 port 8 16 ring wrap 11 8 ring in 11 8 ...

Page 238: ...ons B 3 total errors B 4 transmit collisions B 4 trap 5 20 community string 5 20 IP address 5 20 U unicast frames B 4 users changing 5 16 creating 5 12 deleting 5 14 V very long events B 4 VT100 2 8 5 2 8 4 9 5 9 8 12 2 banner 5 7 interface 8 4 logging on 5 8 management 2 8 9 5 9 8 12 2 menu 5 6 W wake up 3 8 5 7 warning 1 1 3 2 3 3 3 7 Z ZDL state 11 18 ...

Page 239: ...Class A limits for radio noise emissions from digital apparatus as set out in the interference causing equipment standard entitled Digital Apparatus ICES 003 of the Department of Communications Cet appareil numérique respecte les limites de bruits radioélectriques applicables aux appareils numériques de Classe A prescrites dans la norme sur le matériel brouilleur Appareils Numériques NMB 003 édict...

Page 240: ...rom the receiver Plug the equipment into a different outlet so that equipment and receiver are on different branch circuits If necessary the user should consult the dealer or an experienced radio television technician for additional suggestions The user may find the following booklet prepared by the Federal Communications Commission helpful How to Identify and Resolve Radio TV Interference Problem...

Page 241: ...No updates are provided 3Com s sole obligation hereunder shall be at 3Com s discretion to refund the purchase price paid by Customer for any defective software products or to replace any defective media with software which substantially conforms to 3Com s applicable published specifications Customer assumes responsibility for the selection of the appropriate applications program and associated ref...

Page 242: ... ATTEMPTS TO REPAIR OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE OR BY ACCIDENT FIRE LIGHTNING OR OTHER HAZARD Limitation of Liability IN NO EVENT WHETHER BASED IN CONTRACT OR TORT INCLUDING NEGLIGENCE SHALL 3COM BE LIABLE FOR INCIDENTAL CONSEQUENTIAL INDIRECT SPECIAL OR PUNITIVE DAMAGES OF ANY KIND OR FOR LOSS OF REVENUE LOSS OF BUSINESS OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN CON...

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