HP J3188A Hub Maintenance Tasks, Testing the Hub Only, Clearing a Password for the Ascii Console

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Troubleshooting

Hub Maintenance Tasks

Hub Maintenance Tasks

There are several hub maintenance tasks you can perform. They include:

■testing the hub only

■clearing a password from the ASCII console

■running connectivity tests

Each of these tasks is described in the following sections.

Testing the Hub Only

If you believe that the hub is not operating correctly, remove and reinsert the power cord for that hub. This procedure will cause the hub to complete its power-on self-test. If any error conditions exist in the hub, the LEDs should display the condition.

Clearing a Password for the ASCII Console

You can use the Password Reset button to clear a forgotten console password that was previously configured on the hub. The password is configured from the ASCII console.

Troubleshooting

Password

Reset

To clear the password, follow these steps:

1.Verify the hub has powered-up, passed power-on test, and that the System LED is lit.

2.Press the Password Reset button on the back of the hub for 10 seconds.

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Contents HP J3188A Page HP 10Base-T Hub-16M J3188A Installation and Reference GuidePublication Number Front of the Hub HP 10Base-T Hub-16M J3188ABack of the Hub IiiNetwork Connections FeaturesContents Cables and Connectors Vii Security InformationPage Installing the Hub Verify included parts Installing and Configuring Your HubConnect the external transceiver Verify the hub operates correctlyTime Cord connected directly to the hub for proper operationPattern LEDRack or Cabinet Mounting Mount the hubTable Mounting Connect the hub to your network Twisted-Pair Cascade Connections Connecting Devices to the HubConnecting Hubs Together ThinLAN Connections InstallingOhm terminator Interpreting LED Status Connecting the Hub-16M to a Fiber-Optic BackboneInterpreting Hub Status LEDs Following table provides LED port information Interpreting Port Status LEDsPage Troubleshooting Approaches TroubleshootingProblem Solution Using a Checklist to Diagnose the HubTroubleshooting Using a Checklist to Diagnose the Hub LED Operation Diagnostic Tips Troubleshooting LED OperationPower Coll Hub will automatically recover afterClearing a Password for the Ascii Console Hub Maintenance TasksTesting the Hub Only Obtaining Firmware Enhancements Troubleshooting Hub Maintenance TasksRunning Connectivity Tests Managing the Hub Setting up the Ascii ConsoleManaging the Hub Directly, Using a Serial Cable and a TerminalRemotely, Using Telnet Starting the Console Remotely, Using a Modem and a TerminalCommands are described in the rest of the chapter Console Command ReferenceExample HE ST This displays help for the Status command Syntax Conventions on Help ScreenDefault Description BAckupCOunters CDpstatusCounter Name Definition Valid Range RangeDIsconnect IPconfigWhen to Use IPconfig Using Novell NetWare IPX Configuring for Network ManagementUsing IP Following table explains the IP parametersMAnagers SHow Parameter Default Value DefinitionTo end your editing CommandManager Address IP or IPX Receive Alarms? MEssageinterval Displays the other devices that are using CDP protocolNEighbor Table entry with ID 1 would now be a blank lineClear a password PAsswordPIng Community nameRObustness REsetPOrt port ON/OFF SEcure portSHowCLear Security Configuration Parameter DefinitionsManaging the Hub Eavesdrop Prevention, must be set to on Configuring Security on a Single PortConfiguring Security on All Twisted-Pair Ports Address Selection Authorized Clearing Security Violation Indicators Showing the Security ConfigurationSTatus SPeed new speedStatus Information What It Means TEstlink Network links, see the , Troubleshooting16M will respond with the correct packet To sendPage Following table shows PC connections to the RS-232 port Cables and ConnectorsRecommended Cables Cable Function Cable Type HP Product Number Cables and ConnectorsFollowing table shows network connections to the hub Pins 1 and 2 must be a twisted pair Twisted-Pair Cable/Connector Pin-OutsPins 3 and 6 must be a twisted pair Twisted-Pair Cable for Hub-to-Computer Network ConnectionInstaller for assistance with your cabling requirements RS-232 Connector and Cable Pin-OutsCable pin-out described below Minimum pin-out will function correctlyRS-232 Modem Cable SignalMinimum Cable Pinout for Ascii Console Connection Hub End MDI-X Twisted-Pair Cable Pin AssignmentsTwisted-Pair Straight-Through Cable Physical SpecificationsElectrical EnvironmentalElectromagnetic ConnectorsSpecifications Megahertz XJ2288 Pcmcia card modem Modem ConfigurationUS Robotics Courier V.FC/V.34 Supra FAX Practical Peripherals PM288MT IIIntel 14.4EX Communication Between the Hub Network Management Station Network AddressingIP Addresses for IP and Non-IP Networks IPX Addressing for Novell NetWareIPX Addressing Notes Globally Assigned IP Network AddressesCompany Name/Address Device IP ConfigurationCountry Bootp Process Using BootpDefinitions of the table entry fields Bootp Table File EntriesPage How Backup Links Work Backup LinksAdditional Notes Backup LinksLimitations How the Backup Function Works Examples of Backup LinksHub to a Switch Hub to a ServerHub can monitor only one link T e G g e s t i o nConfiguration/Installation Sequence Configuring a Backup LinkIndications of Backup Link Activation Identifying the Backup LinkReactivating the Primary Link Page Understanding Network Security Security InformationHow Eavesdrop Prevention Works How Intruder Prevention WorksAuthorized MAC address Security InformationAssigning the Authorized MAC address Setting Inbound Security with Intruder Prevention Send Alarm Auto Port DisableSetting Outbound Security with Eavesdrop Prevention Security Information Page Mounting Precautions Safety and Regulatory StatementsTemperature might exceed 45C 113F Power PrecautionsSettings to configure Equipment and should be easily accessibleGrounding Safety InformationTible de causer des dommages à léquipement Informations concernant la sécuritéHinweise zur Sicherheit Considerazioni sulla sicurezza Consideraciones sobre seguridad Safety Information Japanese FCC Class a Statement for U.S.A. Only Regulatory StatementsEuropean Community CanadaDeclaration of Conformity Index IndexDiagnosing with the LEDs … 2-2 diagnostic tests Late collision … 3-13 mounting the hub … LED description … Verifying hub operation … Page J3188-90001