Flash memory, Sdram, Router memory – Cisco 520 User Manual

Page 22: Router hardware security, Feature summary

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Cisco Secure Router 520 Series Hardware Installation Guide

OL-12892--01

Chapter 1 Product Overview

Hardware Features

Router Memory

The Cisco Secure Router 520 Series routers support the following types of memory:

Flash Memory

SDRAM

Flash Memory

Flash memory stores the image of the ROMMON boot code, the Cisco IOS software, and the router
configuration file. By default, the router ships with 36 MB of flash memory, with no option for
expansion. The router has enough memory to support the Cisco IOS Advanced IP Services image.

SDRAM

SDRAM stores the Cisco IOS software and provides memory for data that is created during packet
processing. The router provides 128 MB of onboard SDRAM.

Router Hardware Security

Each Cisco Secure Router 520 Series router has a Kensington security slot on the back panel. To secure
the router to a desktop or other surface, use the Kensington lockdown equipment.

Feature Summary

Table 1-2

summarizes the features of the Cisco Secure Router 520 Series routers.

Table 1-2

Cisco Secure Router 520 Series Feature Summary

Feature

Description

Security features

Provides advanced security features, including secure VPN access and
comprehensive threat defense with Cisco IOS Firewall, IPS, and URL filtering. The
Cisco Secure Router 520 Series routers also provides dynamic routing and
advanced QoS features.

IPsec hardware accelerator

The security processor implements symmetric key encryption, public key
encryption, authentication, and data compression in hardware.

Integrated 802.11b/g radio module

(Wireless routers only) Provides connectivity to a wireless LAN using IEEE
802.11b/g standards. Enables the router to act as an access point (AP) in
infrastructure mode.

Flash memory

36 MB of flash memory (default) with no option for expansion. The router has
enough memory to support the Cisco IOS Advanced IP Services image.

SDRAM

128 MB of SDRAM on board.

Dying gasp

Detects whether the router is about to lose power, and then sends a signal to warn
the digital subscriber line access multiplexer (DSLAM) about the impending line
drop.

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