Troubleshooting Approaches | HP J3188A manual

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Troubleshooting

This chapter describes ways to troubleshoot the hub. Topics covered are:

■troubleshooting approaches

■using a checklist to diagnose the hub

■interpreting the LED pattern during self test

■hub maintenance tasks

Troubleshooting Approaches

There are three primary ways to diagnose hub problems:

■By checking the LEDs on the front of the hub as described in the section, “Using a Checklist to Diagnose the Hub” later in this chapter.

■By using the ASCII console’s diagnostic functions as described in chapter 3, “Managing the Hub.”

■By using the CiscoView network management application as described in the CiscoView online help.

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HP J3188A manual Troubleshooting Approaches

Contents

HP J3188A Page HP 10Base-T Hub-16M J3188A Installation and Reference Guide Publication Number Front of the Hub HP 10Base-T Hub-16M J3188ABack of the Hub Iii Network Connections Features Contents Cables and Connectors Vii Security InformationPage Installing the Hub Verify included parts Installing and Configuring Your HubConnect the external transceiver Verify the hub operates correctly Time Cord connected directly to the hub for proper operation Pattern LED Rack or Cabinet Mounting Mount the hub Table Mounting Connect the hub to your network Connecting Hubs Together Connecting Devices to the HubTwisted-Pair Cascade Connections ThinLAN Connections Installing Ohm terminator Interpreting LED Status Connecting the Hub-16M to a Fiber-Optic Backbone Interpreting Hub Status LEDs Following table provides LED port information Interpreting Port Status LEDsPage Troubleshooting Approaches Troubleshooting Troubleshooting Using a Checklist to Diagnose the Hub Using a Checklist to Diagnose the HubProblem Solution LED Operation Diagnostic Tips Troubleshooting LED OperationPower Coll Hub will automatically recover after Testing the Hub Only Hub Maintenance TasksClearing a Password for the Ascii Console Running Connectivity Tests Troubleshooting Hub Maintenance TasksObtaining Firmware Enhancements Managing the Hub Setting up the Ascii Console Remotely, Using Telnet Directly, Using a Serial Cable and a TerminalManaging the Hub Starting the Console Remotely, Using a Modem and a Terminal Commands are described in the rest of the chapter Console Command ReferenceExample HE ST This displays help for the Status command Syntax Conventions on Help Screen Default Description BAckup COunters CDpstatusCounter Name Definition Valid Range Range When to Use IPconfig IPconfigDIsconnect Using Novell NetWare IPX Configuring for Network ManagementUsing IP Following table explains the IP parameters MAnagers SHow Parameter Default Value Definition Manager Address IP or IPX Receive Alarms? CommandTo end your editing MEssageinterval Displays the other devices that are using CDP protocolNEighbor Table entry with ID 1 would now be a blank line Clear a password PAsswordPIng Community name POrt port ON/OFF REsetRObustness SEcure portSHowCLear Security Configuration Parameter Definitions Managing the Hub Configuring Security on All Twisted-Pair Ports Configuring Security on a Single PortEavesdrop Prevention, must be set to on Address Selection Authorized Clearing Security Violation Indicators Showing the Security Configuration STatus SPeed new speed Status Information What It Means TEstlink Network links, see the , Troubleshooting16M will respond with the correct packet To sendPage Recommended Cables Cables and ConnectorsFollowing table shows PC connections to the RS-232 port Following table shows network connections to the hub Cables and ConnectorsCable Function Cable Type HP Product Number 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 Connection Installer for assistance with your cabling requirements RS-232 Connector and Cable Pin-OutsCable pin-out described below Minimum pin-out will function correctly Minimum Cable Pinout for Ascii Console Connection SignalRS-232 Modem Cable Twisted-Pair Straight-Through Cable Twisted-Pair Cable Pin AssignmentsHub End MDI-X Physical SpecificationsElectrical Environmental Specifications ConnectorsElectromagnetic US Robotics Courier V.FC/V.34 Modem ConfigurationMegahertz XJ2288 Pcmcia card modem Intel 14.4EX Practical Peripherals PM288MT IISupra FAX Communication Between the Hub Network Management Station Network Addressing IP Addresses for IP and Non-IP Networks IPX Addressing for Novell NetWareIPX Addressing Notes Globally Assigned IP Network Addresses Country Device IP ConfigurationCompany Name/Address Bootp Process Using Bootp Definitions of the table entry fields Bootp Table File EntriesPage How Backup Links Work Backup Links Limitations Backup LinksAdditional Notes How the Backup Function Works Examples of Backup LinksHub to a Switch Hub to a Server Hub can monitor only one link T e G g e s t i o n Configuration/Installation Sequence Configuring a Backup Link Indications of Backup Link Activation Identifying the Backup Link Reactivating the Primary Link Page Understanding Network Security Security Information How Eavesdrop Prevention Works How Intruder Prevention WorksAuthorized MAC address Security Information Assigning the Authorized MAC address Setting Inbound Security with Intruder Prevention Send Alarm Auto Port Disable Setting Outbound Security with Eavesdrop Prevention Security Information Page Mounting Precautions Safety and Regulatory Statements Temperature might exceed 45C 113F Power PrecautionsSettings to configure Equipment and should be easily accessible Grounding Safety Information Tible de causer des dommages à léquipement Informations concernant la sécurité Hinweise zur Sicherheit Considerazioni sulla sicurezza Consideraciones sobre seguridad Safety Information Japanese FCC Class a Statement for U.S.A. Only Regulatory StatementsEuropean Community Canada Declaration of Conformity Index Index Diagnosing with the LEDs … 2-2 diagnostic tests Late collision … 3-13 mounting the hub … LED description … Verifying hub operation … Page J3188-90001