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Chapter 7 Internet Setup
P-660RU-Tx User’s Guide
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ISP offers a dial-up Internet connection using PPP over Ethernet (PPPoE) or PPPoA,
they should also provide a username and password (and service name) for user
authentication.
ADSL Terms
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.
WAN IP Address
The WAN IP address is an IP address for the P-660RU-Tx, which makes it
accessible from an outside network. It is used by the P-660RU-Tx to communicate
with other devices in other networks. It can be static (fixed) or dynamically
assigned by the ISP each time the P-660RU-Tx 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 QoS
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
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.
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.