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DSL-2520U
ADSL2/2+ Router with USB and Ethernet Ports
User Manual
Overview
Specifications
Interfaces:
•
ADSL: 1 RJ-11 port
•
LAN: 1 RJ-45 10/100BASE-TX Fast Ethernet port with auto-MDI/MDIX
•
USB: 1 port 1.1, type B.
ADSL Standards:
•
ADSL:
◦
full rate 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.
WAN Connection Types:
•
PPPoA
•
PPPoE
•
IPoE
•
IPoA
•
Bridge.
ATM/PPP Protocols:
•
Bridged and routed Ethernet encapsulation
•
VC-based or LLC-based multiplexing
•
ATM Forum UNI3.1/4.0 PVC (up to 8 PVCs)
•
ATM Adaptation Layer Type 5 (AAL5)
•
ITU-T I.610 OAM F4/F5 loopback
•
ATM QoS
•
PPP over ATM (RFC 2364)
•
PPP over Ethernet (PPPoE)
•
Keep-alive for PPP connections.
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Page 7 / 67
DSL-2520U
ADSL2/2+ Router with USB and Ethernet Ports
User Manual
Overview
Network Protocols and Functions:
•
Static IP routing
•
NAT
•
DHCP server/client/relay
•
DNS relay
•
DDNS
•
UPnP
•
Support of VLAN
•
IGMP proxy.
Firewall and Access Management Functions:
•
NAT firewall
•
Stateful Packet Inspection (SPI)
•
URL filter
•
Packet filtering (IP/ICMP/TCP/UDP)
•
Virtual servers
•
Prevention of DoS attacks
•
Intrusion detection system
•
DMZ
•
Port Triggering.
QoS:
•
Interface grouping
•
3 priority queues.
Configuration and Management:
•
Multilingual web-based interface for configuration and management
•
Access via TELNET
•
Firmware update via web-based interface
•
Saving/restoring configuration to/from file
•
Support of remote logging.
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Page 8 / 67
DSL-2520U
ADSL2/2+ Router with USB and Ethernet Ports
User Manual
Overview
Power:
•
External power adapter DC 5V/1A
•
ON/OFF power switch
•
Reset to Factory Defaults button.
Operating
Temperature
:
•
From 0
0
C to 40
0
C (from 32
0
F to 104
0
F).
Storage Temperature:
•
From -20
0
C to 65
0
С (from -4
0
F to 149
0
F).
Humidity:
•
From 5% to 95% non-condensing.
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DSL-2520U
ADSL2/2+ Router with USB and Ethernet Ports
User Manual
Overview
Product Appearance
Front Panel
Figure 1. Front panel view.
LED
Mode
Description
Power
Solid green
The router is powered on.
No light
The router is powered off.
Solid red
The router is in the crash recovery mode.
Status
Blinking green
Traffic (Internet traffic) is passing through the router.
No light
A failure of the system.
LAN
Solid green
A device is connected to the port.
Blinking green
The LAN port is active (upstream or downstream traffic).
USB
Solid green
A device is connected to the port.
Blinking green
The USB port is active (upstream or downstream traffic).
DSL
Solid green
DSL has been synchronized.
Blinking green
Detecting a carrier signal and synchronizing DSL.
No light
No carrier signal.
Internet
Solid green
A WAN connection is established.
No light
The router is in the bridge mode or no WAN connection is
established.
Solid red
An authorization failure.
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Page 10 / 67
DSL-2520U
ADSL2/2+ Router with USB and Ethernet Ports
User Manual
Overview
Back Panel
Figure 2. Back panel view.
Port
Description
DSL
A DSL port to connect the router to the telephone line.
USB
A USB port to connect to a single computer.
LAN
An Ethernet port to connect a computer/switch.
RESET
A button to restore the factory default settings.
To restore the factory defaults, push the button (
with the device turned on)
, hold
it for 10 seconds, and then release the button.
ON/OFF
A button to turn the router on/off.
5V
=
1A
Power connector.
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