HP J3188A manual Using a Checklist to Diagnose the Hub, Problem Solution

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Troubleshooting

Using a Checklist to Diagnose the Hub

Using a Checklist to Diagnose the Hub

Use the following table to diagnose the problem with your HP Hub-16M.

 

 

Problem

Solution

 

 

 

 

 

 

How do I reset the hub?

Remove the plug on the power cord from the

 

 

 

power source and reconnect it.

 

 

 

 

 

 

None of the LEDs are on.

Verify that the power cord is plugged into an

 

 

 

active power source and to the hub. Make sure

 

 

 

these connections are snug. Try power cycling

 

 

 

 

 

 

the hub by unplugging and plugging the hub

Troubleshooting

 

 

back in.

 

 

If the Power LED is still not on, verify the AC

 

 

 

 

 

 

source works by plugging another device into

 

 

 

the outlet. Or try plugging the hub into a different

 

 

 

outlet or try a different power cord.

 

 

 

If this condition persists, call your

 

 

 

HP-authorized LAN dealer or HP representative

 

 

 

for assistance.

 

 

 

 

 

 

I lost the password.

Press the password reset button for 10 seconds.

 

 

 

 

See page 2-4 for more details.

 

 

 

 

 

 

IP configuration errors have been

Use the ASCII console’s IP Configuration

 

 

reported.

function as described in the chapter 3,

 

 

 

“Managing the Hub.”

 

 

 

 

 

 

I want to see if each cable is connected

Run TEstlink. See the command description in

 

 

correctly.

chapter 3, “Managing the Hub.”

 

 

 

 

 

 

A user can’t send data to another user.

Use the Connectivity tests in the ASCII console

 

 

 

or in CiscoView to test the cabling. The tests are

 

 

 

described in this chapter.

 

 

 

 

 

 

The Fault LED is on.

Remove the plug on the power cord from the

 

 

 

power source and reconnect it. If problem

 

 

 

persists, the device has an internal failure.

 

 

 

Contact your HP authorized dealer or reseller.

 

 

 

 

 

 

The Security LED is flashing. How do I

Use the ASCII console or CiscoView to view the

 

 

get it to stop?

intruder log and clear the security violations.

 

 

 

 

Most problems with the hub can be diagnosed using the LEDs on its front panel. The following section describes the normal LED pattern during self- test, and LED patterns that indicate error conditions on the hub.

2-2

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Contents HP J3188A Page Installation and Reference Guide HP 10Base-T Hub-16M J3188APublication Number Back of the Hub HP 10Base-T Hub-16M J3188AFront of the Hub IiiFeatures Network ConnectionsContents Cables and Connectors Security Information ViiPage Installing the Hub Connect the external transceiver Installing and Configuring Your HubVerify included parts Verify the hub operates correctlyCord connected directly to the hub for proper operation TimeLED PatternMount the hub Rack or Cabinet MountingTable Mounting Connect the hub to your network Twisted-Pair Cascade Connections Connecting Devices to the HubConnecting Hubs Together Installing ThinLAN ConnectionsOhm terminator Connecting the Hub-16M to a Fiber-Optic Backbone Interpreting LED StatusInterpreting Hub Status LEDs Interpreting Port Status LEDs Following table provides LED port informationPage Troubleshooting Troubleshooting ApproachesProblem Solution Using a Checklist to Diagnose the HubTroubleshooting Using a Checklist to Diagnose the Hub LED Operation Power Coll Troubleshooting LED OperationDiagnostic Tips 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 Setting up the Ascii Console Managing the HubManaging the Hub Directly, Using a Serial Cable and a TerminalRemotely, Using Telnet Remotely, Using a Modem and a Terminal Starting the ConsoleExample HE ST This displays help for the Status command Console Command ReferenceCommands are described in the rest of the chapter Syntax Conventions on Help ScreenBAckup Default DescriptionCounter Name Definition Valid Range CDpstatusCOunters RangeDIsconnect IPconfigWhen to Use IPconfig Using IP Configuring for Network ManagementUsing Novell NetWare IPX Following table explains the IP parametersParameter Default Value Definition MAnagers SHowTo end your editing CommandManager Address IP or IPX Receive Alarms? NEighbor Displays the other devices that are using CDP protocolMEssageinterval Table entry with ID 1 would now be a blank linePIng PAsswordClear a password Community nameRObustness REsetPOrt port ON/OFF Security Configuration Parameter Definitions SEcure portSHowCLearManaging the Hub Eavesdrop Prevention, must be set to on Configuring Security on a Single PortConfiguring Security on All Twisted-Pair Ports Address Selection Authorized Showing the Security Configuration Clearing Security Violation IndicatorsSPeed new speed STatusStatus Information What It Means 16M will respond with the correct packet Network links, see the , TroubleshootingTEstlink 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 3 and 6 must be a twisted pair Twisted-Pair Cable/Connector Pin-OutsPins 1 and 2 must be a twisted pair Twisted-Pair Cable for Hub-to-Computer Network ConnectionCable pin-out described below RS-232 Connector and Cable Pin-OutsInstaller for assistance with your cabling requirements 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 Electrical SpecificationsPhysical EnvironmentalElectromagnetic ConnectorsSpecifications Megahertz XJ2288 Pcmcia card modem Modem ConfigurationUS Robotics Courier V.FC/V.34 Supra FAX Practical Peripherals PM288MT IIIntel 14.4EX Network Addressing Communication Between the Hub Network Management StationIPX Addressing Notes IPX Addressing for Novell NetWareIP Addresses for IP and Non-IP Networks Globally Assigned IP Network AddressesCompany Name/Address Device IP ConfigurationCountry Using Bootp Bootp ProcessBootp Table File Entries Definitions of the table entry fieldsPage Backup Links How Backup Links WorkAdditional Notes Backup LinksLimitations Hub to a Switch Examples of Backup LinksHow the Backup Function Works Hub to a ServerT e G g e s t i o n Hub can monitor only one linkConfiguring a Backup Link Configuration/Installation SequenceIdentifying the Backup Link Indications of Backup Link ActivationReactivating the Primary Link Page Security Information Understanding Network SecurityAuthorized MAC address How Intruder Prevention WorksHow Eavesdrop Prevention Works Security InformationAssigning the Authorized MAC address Setting Inbound Security with Intruder Prevention Auto Port Disable Send AlarmSetting Outbound Security with Eavesdrop Prevention Security Information Page Safety and Regulatory Statements Mounting PrecautionsSettings to configure Power PrecautionsTemperature might exceed 45C 113F Equipment and should be easily accessibleSafety Information GroundingInformations concernant la sécurité Tible de causer des dommages à léquipementHinweise zur Sicherheit Considerazioni sulla sicurezza Consideraciones sobre seguridad Safety Information Japanese European Community Regulatory StatementsFCC Class a Statement for U.S.A. Only 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