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Revision: V1.0
Apr. 23, 2008
Chapter 1 - Getting to Know DSL-2120/2120W
Your DSL-2120/2120W integrates high-speed 10/100Mbps auto-negotiating LAN
interface(s), USB port and a high-speed ADSL port. The DSL-2120/2120W is perfect for
making LAN-to-LAN connections to remote networks and for high-speed Internet browsing.
The DSL-2120/2120W provides lightning-fast Internet access to multiple users by combining
Direct Subscriber Line (DSL) and Network Address Translation (NAT).
The Web-based Graphical User Interface (GUI) allows easy management and is not
dependent on any single operating system to use.
1.1 Features of the DSL-2120/2120W
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High Speed Internet Access
The DSL-2120/2120W ADSL 2/2+ router support downstream transmission rates of up to
24Mbps and upstream transmission rates of 1Mbps.
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PPPoE Support (RFC2516)
Point-to-Point Protocol over Ethernet (PPPoE) emulates a dial-up connection. It allows
your Internet Service Provider (ISP) to use its existing network configuration with newer
broadband technologies such as ADSL. The PPPoE driver on the DSL-2120/2120W is
transparent to the computers on the LAN. Computers see only Ethernet and are not aware of
PPPoE; you don’t have to manage PPPoE clients on individual computers.
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Network Address Translation (NAT)
Network Address Translation (NAT) allows the conversion of an Internet protocol (IP)
address used within one network, such as a private IP address used in a LAN, to a different IP
address known within another network, such as a public IP address used on the Internet.
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Universal Plug and Play (UPnP)
Using the standard TCP/IP protocol, the DSL-2120/2120W and other UPnP enabled
devices can dynamically join a network, obtain an IP address and convey its capabilities to
other devices on the network.
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10/100M Auto-negotiation Ethernet/Fast Ethernet Interface
Auto-negotiation allows the DSL-2120/2120W to detect incoming transmissions’ speeds
and make necessary adjustments without manual intervention. It also allows data transfer
rates of either 10 Mbps or 100 Mbps, in either half-duplex or full-duplex mode, depending on
your Ethernet network.
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Dynamic DNS Support
With Dynamic DNS support, you can have a static hostname alias for a dynamic IP
address, allowing the host to be more easily accessed from other locations on the Internet.