Data Sheet
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Product Specifications
Table 4 lists specifications for the Cisco Catalyst Express 520 Series Switches.
Table 4. Specifications for Cisco Catalyst Express 520 Series Switches
Feature Description
Performance
DRAM and flash memory 64 MB DRAM and 16 MB flash memory
Switching Capacity 16 Gbps
Forwarding rate (based on 64-
byte packets)
2.7 Mpps
Layer 2 Switching
Spanning Tree Protocol
Fast convergence using 802.1w, activated by default
PortFast supported for Desktop, IP Phone + Desktop, Printer, and Server Cisco
Smartports roles
MAC addresses 8000 MAC addresses
Virtual LANs (VLANs) Up to 32 VLANs (1000 range) and support for 802.1Q trunking using Cisco Smartports
Number and type of queues
4 queues per port
Shaped Round Robin (SRR) queuing
Support for DSCP and CoS using Cisco Smartports
Cisco Smartports (Preset Cisco Recommended Network Enhancements, QoS, and Security)
Desktop
Optimized for desktop connectivity
Configurable VLAN setting
Port security activated to limit unauthorized access to the network
IP Phone + Desktop
Optimized QoS for IP Phone + Desktop configurations
Voice traffic is placed on “Cisco Voice” VLAN
Configurable data VLAN
QoS level helps ensure that voice-over-IP (VoIP) traffic takes precedence
Port security activated to limit unauthorized access to the network
Router
Configured for optimal connection to a router or firewall for WAN connectivity
Switch
Configured as an uplink port to a backbone switch for fast convergence
Permits 802.1Q trunking
Access point
Configured for optimal connection to a wireless access point
Configurable VLAN
Server
Can be classified as trusted, critical, business, or standard server
Trusted—For use with Cisco Unified Communications Manager Express; same
QoS setting as for voice (VoIP traffic is prioritized)
Critical—For crucial servers with QoS set higher than default
Business—Default setting; QoS higher than for desktop Internet traffic
Standard—For servers set to same level as regular desktop Internet traffic
Configurable VLAN
Port security activated to limit unauthorized access to the network
Printer
QoS settings for Printer are the same as for Desktop, Access Point, and Standard
Server
Configurable VLAN
Port security activated to limit unauthorized access to the network
Guest
Guests are allowed access to the Internet, but not to the company network
All guest ports are placed on “Cisco Guest” VLAN
Port security activated to limit unauthorized access to the network
Other
Cisco Smartports Other role allows for flexible connectivity of nonspecified devices
Configurable VLAN
No security
No QoS policy
Diagnostic Customers can connect diagnostic devices to monitor traffic on other switches
(configurable using Cisco Configuration Assistant only)
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