ZyXEL Communications P-660R-11V3 User Manual

Chapter 7 Internet Setup

P-660R-T1 v3 User’s Guide

A Permanent Virtual Circuit (PVC) is the connection for your device to the ISP. You need a 
Virtual Path Identifier (VPI) and a Virtual Channel Identifier (VCI) to identify a PVC. 
Multiplexing is a way of carrying protocols on a PVC. Your ISP should supply you with all 
this information.

The WAN IP address is an IP address for the ZyXEL Device, which makes it accessible from 
an outside network. It is used by the ZyXEL Device to communicate with other devices in 
other networks. It can be static (fixed) or dynamically assigned by the ISP each time the 
ZyXEL Device 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).

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. QoS is a service agreement 
that guarantees certain speed even when the network is congested. ATM QoS is defined by the 
Peak Cell Rate (PCR), Sustain Cell Rate (SCR) and Maximum Burst Size (MBS).

NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a 
host in a packet, for example, the source address of an outgoing packet, used within one 
network to a different IP address known within another network.

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.

Internet Group Multicast Protocol (IGMP) is a network-layer protocol used to establish 
membership in a Multicast group - it is not used to carry user data. There are three versions of 
IGMP. IGMP version 2 is an improvement over version 1, but IGMP version 1 is still in wide 
use. IGMP version 3 supports source filtering, reporting or ignoring traffic from specific 
source address to a particular host on the network.

See 

 for technical background information on WAN.

You need to know your Internet access settings such as encapsulation and WAN IP address. 
Get this information from your ISP.