Cisco Systems 815 manual Problem Solving, OK LED Diagnostics

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Chapter 3 Troubleshooting

Problem Solving

Step 3 Press Ctrl-Zto exit configuration mode:

Router(config)# Ctrl-Z

Step 4 Reboot the router, and enter the recovered enable password.

Problem Solving

The key to problem solving is to isolate the problem to a specific subsystem by comparing what the router is doing to what it should be doing.

In problem solving, consider the following subsystems of the router:

WICs—Refer to the LEDs on the cards and the LEDs on the router front panel to help identify a failure. For more information on WAN interface cards (WICs), refer to the Cisco Interface Cards Hardware Installation Guide.

Cables—Check all the external cables that connect the router to the network.

Power system—Check the external power source, power cable, router power supply, and circuit breaker. Check for inadequate ventilation or air circulation that might cause overheating.

OK LED Diagnostics

Use the front panel OK LED to determine any problems with the router. When the router first boots up, it performs a power-on self-test (POST). If the router detects a problem during the POST, the OK LED blinks in different patterns (described in Table 3-1), depending on the problem. A pattern consists of a specific number of blinks that is repeated until the router is turned off. If the router experiences any of these problems, contact your Cisco reseller.

 

 

Cisco 815 Integrated Services Router Hardware Installation Guide

 

 

 

 

 

 

OL-9558-01

 

 

3-7

 

 

 

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Contents Corporate Headquarters Page Cisco Systems, Inc. All rights reserved Page N T E N T S Installation Vii Installing and Removing a Dimm C-4Viii Organization Audience and ScopeRelated Documentation Conventions Xii Xiii Xiv Page Xvi Xvii Xviii CommandsObtaining Documentation AccessibilityCisco.com XixDocumentation Store in the Cisco Marketplace at this URL Product Documentation DVD Ordering DocumentationDocumentation Feedback Cisco Product Security OverviewXxi Xxii Reporting Security Problems in Cisco ProductsObtaining Technical Assistance Cisco Technical Support & Documentation WebsiteXxiii Submitting a Service Request Definitions of Service Request SeverityXxiv Xxv Obtaining Additional Publications and InformationXxvi Overview Key FeaturesFeature Description Cisco Product Serial Number LocationBack Panel Ports and LEDs Back Panel Ports and LEDsLabel/Color Description WIC0 OK Front Panel LEDsLED Label Color Description Types of Memory Router Memory815# show version Amounts of MemoryUnpacking the Router Items Included with the Cisco 815 Integrated Services RouterBefore Installing the Router InstallationConnecting the Router to Your Local Network Installation Connecting the Router to Your Local Network Connecting the Router to the Local Network Connecting the Power Supply Connecting Power to the RouterVerifying Your Installation Connecting a PC Optional Installation ProceduresConnecting the Console Cable to the Router AUX port RJ-45 DB-9-to-DB-25 adapter Console cable Modem Connecting a ModemStacking the Router Assembling Stacking Clip and Fastener Stacking the Router Back View Unstacking the Router Unstacking the RouterOL-9558-01 Contacting Your Cisco Reseller TroubleshootingDetermining the Configuration Register Value Recovering a Lost PasswordConfiguration register is 0x2102 815# Press Return. The following prompt appears Resetting the RouterPrompt changes to the privileged Exec prompt Resetting the Configuration Register Value Resetting the PasswordOK LED Diagnostics Problem SolvingNumber of Blinks Meaning Troubleshooting WICs and CablesExample WIC-4ESW Troubleshooting the Power System Symptom Possible Causes Technical Specifications Operating Specifications Ethernet Cables Cabling Specifications10BASE-T 100BASE-TX Ethernet Network Cabling GuidelinesConsole Cable and Adapter Signal RJ-45 Pin DB-9 Pin DB-25 PinOL-9558-01 Safety Warnings Opening the Chassis Figure C-1 Removing the Chassis Screws Locating Modules Installing and Removing a DimmRelease the latches Remove the Dimm Removing a DimmInsert the Dimm Latches rotate to closed position Installing a DimmScrew Standoff Installing a VPN ModuleFigure C-7 VPN Module Location Figure C-9 Retention Clip Location Figure C-10 Aligning the Retention Clip Center Post Figure C-11 Attaching the Retention Clip to the Motherboard Figure C-12 Securing the Standoff to the Router Motherboard Closing the Chassis Figure C-13 Attaching the Router Cover IN-1 NumericsCIN-2 ETH COL LEDIN-3 Dimm C-4IN-4