Cisco ASA 5520 Adaptive Security Appliance, 1U Firewall, 4-Port Gigabit Ethernet, 2GB RAM: This is a Cisco ASA 5500-series 1U rack-mount security appliance providing stateful firewall, VPN concentrator, and IPS-ready services for SMB and enterprise edge deployments. Model ASA 5520. This is a dedicated security appliance, not a router, switch, or general-purpose server. This is a refurbished unit, fully tested.
Engineering Context
The ASA 5520 is rated by Cisco at 450 Mbps stateful firewall throughput, 225 Mbps 3DES/AES VPN throughput, 9,000 connections per second, and up to 280,000 concurrent connections. It supports up to 750 IPSec VPN peers and 100 VLAN-tagged virtual interfaces. RAM is 2 GB and flash is 256 MB. The chassis is 1U rack-mount, dimensions 44.5 x 33.5 x 4.4 cm, weight approximately 9.1 kg. One expansion slot accepts an SSM (Security Services Module) for IPS or content security functionality.
Deployment & Use Cases
SMB and mid-size enterprise internet edge with stateful firewall and site-to-site IPSec VPN. Branch-office concentrator for remote-access SSL VPN (limited to 2 SSL VPN peers without additional licensing). Network segmentation between security zones using VLAN sub-interfaces. Lab and training environments for Cisco ASA configuration, ACL design, and VPN troubleshooting practice.
Technical Specifications
OEM: Cisco
Model: ASA 5520
Form Factor: 1U Rack-Mount
Firewall Throughput: 450 Mbps (stateful)
VPN Throughput: 225 Mbps (3DES/AES)
Concurrent Connections: 280,000
IPSec VPN Peers: Up to 750
VLANs: Up to 100
Interfaces: 4 x Gigabit Ethernet plus 1 x Management 10/100
Expansion: 1 SSM slot
RAM / Flash: 2 GB / 256 MB
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
The ASA 5520 has reached End-of-Life and End-of-Support per Cisco; new TAC software updates are not available. Refurbished units are recommended for lab, non-production, or controlled production roles where vendor support is not required. Maximum supported software is Cisco ASA 8.4(x); not compatible with newer ASA 9.x feature sets that require successor platforms (ASA 5500-X series or Firepower). SSL VPN peers are limited to 2 by default; additional peers require AnyConnect or Premium licenses, sold separately. Power input is internal universal AC PSU; not a DC unit despite older spec sheets that list 48 V references.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS tests every ASA 5520 for boot diagnostics, all four GbE interfaces, console access, and ASA software boot. We provide 1–3 day handling time, EU shipping, and post-sale technical support for ASA configuration questions.
Frequently Asked Questions
What firewall throughput does the Cisco have?
The Cisco firewall throughput is 450 Mbps (stateful), as listed in the specifications for Cisco.
What is the Cisco NOT compatible with?
This is a dedicated security appliance, not a router, switch, or general-purpose server. Confirm fitment against your platform before ordering Cisco.
What condition is the Cisco supplied in, and who sells it?
The Cisco is supplied in Refurbished condition by T.E.S IT-SOLUTIONS from EU stock, with 1-3 business day handling and worldwide B2B shipping. See https://www.tes-itsolutions.com/product-page/cisco-asa-5520-referbushed.