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ADSL2+ Ethernet Modem



Ultimate Internet Connection

The ADSL2+ Modem (DSL-520B) is an affordable high-performance modem ideal for your home or small office. This modem supports high download speeds, Quality of Service (QoS), and extensive firewall protection, providing all the essentials that a home or small office would need to establish a secure and high speed remote link to the outside world.

Safe and Secure

Security features prevent unauthorized access of Internet intruders from entering your home network. This modem provides firewall security using Stateful Packet Inspection (SPI) and Denial of Service (DoS) attack protection. SPI inspects the contents of all incoming packet headers before deciding what packets are allowed to pass through.


Intelligent Traffic Control

Quality of Service (QoS) supports multiple priority queues to enable a group of home users to experience the benefits of smooth network connection of inbound and outbound data without concern for traffic congestion. This modem’s QoS support allows users to enjoy high ADSL transmission for applications such as VoIP, streaming multimedia and online games.


High-Speed Internet Access

Always on high-speed internet connection, this modem allows you to do all of your favorite things on the Internet. Watch TV, listen to live music, play games, and experience clear Internet phone calls. Now, smooth streaming multimedia and VoIP voice are possible at home and in the office through a simple connection with this modem.

Device Interfaces

  • RJ-11 ADSL port
  • RJ-45 10/100BASE-TX Ethernet port with auto MDI//MDIX

ADSL Standards 

  • ADSL : Multi-mode, ANSI T1.413 Issue 2, ITU-T G.992.1 (G.dmt) Annex A, ITU-T G.992.2 (G.lite) Annex A,
  • ITU-T G.994.1 (G.hs)
  • ADSL2: ITU-T G.992.3 (G.dmt.bis) Annex A/L/M ITU-T G.992.4 (G.lite.bis) Annex A
  • ADSL2+: ITU-T G.992.5 Annex A/M

ADSL Data Rates 

  • G.dmt: 8Mbps downstream, 832Kbps upstream
  • G.lite: 1.5Mbps downstream, 512Kbps upstream
  • ADSL2: 12Mbps downstream, 1Mbps upstream
  • ADSL2+: 24Mbps downstream, 3.5Mbps upstream

ATM & PPP Protocols 

  • ATM Adaption Layer type 5 (AAL5)
  • ridged or routed Ethernet encapsulation
  • VC and LLC based multiplexing
  • MAC Encapsulated Routing
  • ATM Forum UNI3.1/4.0 PVC
  • ATM Cell Format ITU-T Rec. I.361
  • PPP over ATM (RFC 2364)
  • PPP over Ethernet (PPPoE)
  • PPP Link Control Protocol (LCP)
  • Internet Protocol Control Protocol (IPCP)
  • PPP Authentication Protocol (PAP)
  • PPP Challenge Handshake
  • Authentication Protocol (CHAP)
  • Microsoft PPP CHAP extensions

Virtual Private Network 

  • Multiple IPSec/PPTP/L2TP pass-through

Router Features & Netework Protocols 

  • Internet Control Message Protocol (ICMP)
  • Network Address Translation (NAT), IP Static Routing, Routing Information Protocol (RIPv1, RIPv2)
  • NAT ALG (optional):
  • MSN/AOL/Yahoo Messenger, FTP, CUSEEME, Real Audio, MIRC, SIP, ICQ, games, SNMP
  • Dynamic Host Configuration Protocol (DHCP); DHCP server, client, and relay
  • SNTP, DNS Relay, DDNS proxy and IGMP proxy

Firewall ⁄Access Security 

  • MAC Filtering (optional)
  • Packet Filtering
  • Stateful Packet Inspection (SPI)
  • Denial of Service prevention (DoS)
  • Intrusion Detection System/Log
  • User Authentication PAP
  • User Authentication CHAP


  • Web-based GUI configuration
  • 3-level login control for local/remote management
  • Firmware upgraded, configuration data uploaded and downloaded via Webbased GUI
  • TFTP for firmware, configuration files and image files upgrade and download
  • TFTP server and client
  • Code Lock to prevent from improper firmware upgrade through UI, TFTP, and TR-069
  • Telnet/SSH access for configuration (optional)
  • Local access via console (optional)
  • ADSL/ADSL2/ADSL2+ manual selection and auto fallback
  • Auto VPI/VCI detection
  • Configuration backup and restore
  • Diagnostics
  • Log & Trace function
  • SNMP v.1 and v.2c with MIB-I and MIBII (optional)
  • TR-069 compliant with ACS (optional)

Quality of Service 

  • Traffic Prioritization/Classification
  • Port-based priority
  • 802.1p/q (0-7) priority
  • DiffServ-Codepoint IPQos (TOS)
  • Application port-based priority
  • 4 priority queues per PVC
  • Traffic Shaping


  • Input: 100-240 AC, 50/60 Hzs
  • Output: 12v DC, 0.5A
  • Power switch (optional)
  • Factory reset button

Operating Temperature 

  • 32°F to 104°F (0° C to 40° C)

Storage Temperature 

  • -4°F to 158°F (-20° C to 70° C)

Operating Humidity 

  • -5% to 95% non-condensing


  • FCC Part 15 Class B
  • CE
  • ROHS


  • 1-Year Limited

The ADSL2+ Ethernet Modem (DSL-520B) supports high download speeds, Quality of Service (QoS), and extensive firewall protection, providing all the essentials that a home or small office needs to establish a secure and high speed remote link to the Internet.

  • Affordable high-performance modem
  • Extensive Firewall features for added Internet defense
  • Quality of Service for smooth traffic
  • High-speed internet access
  • Provides high-speed Internet

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ADSL2+ Ethernet Modem

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