DSL-2520u ADSL2+ Ethernet / USB Combo Router

This ADSL Combo Modem Router connects your computer to the Internet using an integrated high-speed ADSL2+ interface. It provides a NAT firewall and SPI to protect your computer from Internet attacks, and QoS functions to prioritize traffic for smooth online gaming, streaming multimedia and voice communication over the Internet. When needed, multiple computers at home and the office can also share the high-speed Internet line using the router’s built-in DHCP server/NAT functions and an externally connected Ethernet Switch.

Category    : Wireless

Model       : DSL-2520U

Brochure  : DSL-2520u_ds.pdf

Brand     : D-Link

Manual  :

  • Features
  • Specifications
  • Latest ADSL2+ standard provides Internet transmission of up to 24 Mbps downstream,up to 2 Mbps upstream
  • Built-in ADSL modem, Ethernet and USB ports, QoS and Firewall protection, all in one single palm-sized box
  • TOTAL COMPATIBILITY & EASE OF USE Works with all major Internet Service Providers, simple installation


Device Interfaces

  • RJ11 ADSL port
  • RJ45 Ethernet LAN port
  • Factory reset button
  • USB1.1/2.0 device port

ADSL Standard

  • Full ADSL2+/2/1 standards
  • Discrete Multi-Tone (DMT)
  • ANSI T1.413 Issue 2
  • ITU G.992.3 ADSL2 (G.dmt.bis)
  • Annex A,I,J,L,M
  • ITU G.992.1 (G.dmt)
  • ITU G.992.2 (G.lite)
  • ITU G.992.5 (G.dmt.bisplus )

ATM Specifications

  • Support AAL5
  • Support 8 Permanent Virtual Circuits (PVCs)
  • UBR, CBR, rt-VBR, nrt-VBR
  • ITU-T I.610 OAM Principles& Functions (include F4/F5)

Basic Protocols

  • Multiple protocol encapsulation over AAL5:
  1. Support Logical Link Control (LLC) encapsulation
  2. Support VC-based multiplexing
  3. Support Bridged and Routing 


  • PPP over AAL5:
  1. Support LLC encapsulation
  2. Support PPP over Ethernet Pass through
  3. Support PPP over Ethernet
  4. Classical IP over ATM


Bridge Function

  • Transparent, learning bridge with spanning tree support

Routing Function

  • proxy-ARP
  • Static Routing
  • DHCP Server / Client
  • IGMP v1, v2 Proxy
  • Dynamic DNS


  • Network Address Translator (NAT)
  • PPP with PAP/CHAP
  • Raw/IP Filtering
  • SPI
  • L2TP/PPTP Pass Through
  • VPN: IPSec Pass Through
  • DoS (UDP, TCP), Detection of Known Attacks
  • Detect port scan attack
  • ID/Password Authentication