Cisco Systems 815 manual Router Memory, Types of Memory

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Chapter 1 Overview

Router Memory

Table 1-4	Front Panel LEDs (continued)

LED Label	Color	Description

		2-port serial cards—Blinks when data is being sent to or received from
		the second port on the 2-port card in the WIC 1 slot.

ETH	N/A	N/A.

ACT	Green	Blinks when there is network activity on the Ethernet port.

COL	Yellow	Blinks when there are packet collisions on the local Ethernet network.

Router Memory

This section describes the types of memory stored in the router and how to find out how much of each type of memory is stored in the router.

For instruction on how to upgrade memory in the router, see Appendix C, “Installing and Upgrading Memory and Virtual Private Network Modules.”

Types of Memory

The Cisco 815 integrated services router has the following types of memory:

•Dynamic random-access memory (DRAM)—This is the main storage memory for the router. DRAM is also called working storage. It contains the dynamic configuration information. The DRAM in the Cisco 815 integrated services router stores a working copy of the Cisco IOS software, dynamic configuration information, and routing table information.

•Nonvolatile random-access memory (NVRAM)—This type of memory contains a backup copy of the router configuration. If the power is lost or the router is turned off, this backup copy enables the router to return to operation without reconfiguration.

•Flash memory—This special kind of erasable, programmable memory contains a copy of the Cisco IOS software. The flash memory structure can store multiple copies of the Cisco IOS software. You can load a new level of the operating system in every router in your network and then, when convenient, upgrade the whole network to the new level.

	Cisco 815 Integrated Services Router Hardware Installation Guide
1-8	OL-9558-01

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Contents Corporate Headquarters Page Cisco Systems, Inc. All rights reserved Page N T E N T S Installation Installing and Removing a Dimm C-4 ViiViii Audience and Scope OrganizationRelated Documentation Conventions Xii Xiii Xiv Page Xvi Xvii Commands XviiiCisco.com AccessibilityObtaining Documentation XixProduct Documentation DVD Ordering Documentation Documentation Store in the Cisco Marketplace at this URLCisco Product Security Overview Documentation FeedbackXxi Reporting Security Problems in Cisco Products XxiiCisco Technical Support & Documentation Website Obtaining Technical AssistanceXxiii Definitions of Service Request Severity Submitting a Service RequestXxiv Obtaining Additional Publications and Information XxvXxvi Key Features OverviewFeature Description Product Serial Number Location CiscoBack Panel Ports and LEDs Back Panel Ports and LEDsLabel/Color Description Front Panel LEDs WIC0 OKLED Label Color Description Router Memory Types of MemoryAmounts of Memory 815# show versionItems Included with the Cisco 815 Integrated Services Router Unpacking the RouterInstallation Before Installing the RouterConnecting the Router to Your Local Network Installation Connecting the Router to Your Local Network Connecting the Router to the Local Network Connecting Power to the Router Connecting the Power SupplyVerifying Your Installation Optional Installation Procedures Connecting a PCConnecting the Console Cable to the Router Connecting a Modem AUX port RJ-45 DB-9-to-DB-25 adapter Console cable ModemStacking the Router Assembling Stacking Clip and Fastener Stacking the Router Back View Unstacking the Router Unstacking the RouterOL-9558-01 Troubleshooting Contacting Your Cisco ResellerRecovering a Lost Password Determining the Configuration Register ValueConfiguration register is 0x2102 815# Resetting the Router Press Return. The following prompt appearsPrompt changes to the privileged Exec prompt Resetting the Password Resetting the Configuration Register ValueProblem Solving OK LED DiagnosticsTroubleshooting WICs and Cables Number of Blinks MeaningExample WIC-4ESW Troubleshooting the Power System Symptom Possible Causes Technical Specifications Operating Specifications Cabling Specifications Ethernet CablesEthernet Network Cabling Guidelines 10BASE-T 100BASE-TXSignal RJ-45 Pin DB-9 Pin DB-25 Pin Console Cable and AdapterOL-9558-01 Safety Warnings Opening the Chassis Figure C-1 Removing the Chassis Screws Installing and Removing a Dimm Locating ModulesRemoving a Dimm Release the latches Remove the DimmInstalling a Dimm Insert the Dimm Latches rotate to closed positionInstalling a VPN Module Screw StandoffFigure 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 NumericsC IN-1ETH COL LED IN-2Dimm C-4 IN-3IN-4