Chapter 6 WAN Setup
P-792H v2 User’s Guide
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6.1.2 What You Need to Know About WAN
Encapsulation Method
Encapsulation is used to include data from an upper layer protocol into a lower
layer protocol. To set up a WAN connection to the Internet, you need to use the
same encapsulation method used by your ISP (Internet Service Provider). If your
ISP offers a dial-up Internet connection using PPPoE (PPP over Ethernet) or PPPoA,
they should also provide a username and password (and service name) for user
authentication.
WAN IP Address
The WAN IP address is an IP address for the P-792H v2, which makes it accessible
from an outside network. It is used by the P-792H v2 to communicate with other
devices in other networks. It can be static (fixed) or dynamically assigned by the
ISP each time the P-792H v2 tries to access the Internet.
If your ISP assigns you a static WAN IP address, they should also assign you the
subnet mask and DNS server IP address(es) (and a gateway IP address if you use
the Ethernet or ENET ENCAP encapsulation method).
ATM
Asynchronous Transfer Mode (ATM) is a LAN and WAN networking technology that
provides high-speed data transfer. ATM uses fixed-size packets of information
called cells. With ATM, a high QoS (Quality of Service) can be guaranteed. ATM
uses a connection-oriented model and establishes a virtual circuit (VC) between
two endpoints before the actual data exchange begins.
PTM
Packet Transfer Mode (PTM) is packet-oriented and supported by the VDSL2
standard. In PTM, packets are encapsulated directly in the High-level Data Link
Control (HDLC) frames. It is designed to provide a low-overhead, transparent way
of transporting packets over DSL links, as an alternative to ATM.
Multicast
Traditionally, IP packets are transmitted in one of either two ways - Unicast (1
sender - 1 recipient) or Broadcast (1 sender - everybody on the network).
Multicast delivers IP packets to a group of hosts on the network - not everybody
and not just one.
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