Cisco 520 - Manual (Page 22)

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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.