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5
Configuring WAN Interfaces
The Ethernet Modem Router’s WAN-side interfaces are used to
communication via the DSL port.
A WAN interface comprises two layers—a lower-level ATM VC
interface and a higher-level protocol interface:
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The ATM VC interface enables the device to communicate
using the Asynchronous Transfer Mode protocol. The ATM
protocol provides a common format for transmitting data
over a variety of hardware systems that make up the
backbone of the Internet. The
virtual circuit (VC) properties
of the ATM VC interface identify a unique path that your
ADSL2+ Ethernet Modem Router uses to communicate via
the ATM-based network with the telephone company
central office equipment.
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The higher-level protocol interface(s) operate “on top” of
the ATM VC interface. The higher-level interface handles
the protocols needed to log onto and exchange data with
the ISP’s access server. ISPs can use several different
protocols, including the Point-to-Point Protocol (PPP),
Ethernet-over-ATM (EoA) protocol, or the Internet Protocol-
over-ATM (IPoA). Be sure to create the specific type of
WAN interface your ISP requires.
The following section describes configuring the AMT interface
properties. After you have defined these properties, you can
configure one of the higher level WAN interfaces to enable
communication with your ISP, as described in the subsequent
sections.