System Mode Encapsulation. ADC 400F, 700F, Megabit Modem 700F, Megabit Modem 500L, 600F, Megabit Modem 600F

ADC 400F is designed to give you the access to high-speed data over regular copper telephone lines. This allows you to take advantage of services such as fast Internet access, video on demand, or distance learning. The ADC 400F provides a cost-effective way to extend the range of your network, and it is ideal for small businesses, home offices, and remote locations.

PDF

Document

Chapter 10: Technical Reference

YSTEM

ODE

NCAPSULATION

Point-to-Point Protocol (PPP) over ATM or RFC 1483 Bridging/Routing are the two protocols you can use to encapsulate data for transport across the ADSL WAN. The following sections describe these protocols.

PPP

PPP runs over ATM virtual circuits. PPP exists between the hardware layer and the network-layer interface protocols. It is a widely used protocol for establishing connections on the WAN. PPP provides the set up and release of connections for each session. PAP/CHAP provide the authentication for the PPP sessions.

In PPP over ATM mode, you can map private IP address LAN users to PPP sessions using RFC

1631 Network Address Translation protocol.

PAP/CHAP Authentication Security

Password Authentication Protocol (PAP) and Challenge-Handshake Authentication Protocol

(CHAP) are two ways to authenticate PPP sessions. PAP and CHAP are both offered since some systems support only PAP. With PAP, the modem sends authentication requests to the service provider and authentication occurs only once during the life of the link.

With CHAP, the service provider returns an authentication challenge to the modem during authentication. CHAP can be renegotiated during the life of the link. Also, both the modem and the service provider must support clear text versions of the password. The CHAP host field must be the same on both ends of the session.

NAT

RFC 3022 Network Address Translation (NAT) includes two operations. They are Basic NAT and Network Address Port Translation (NAPT).

Basic NAT only deals with IP addresses. Therefore, it is a one-to-one private IP address to public IP address (proxy address) mapping. Basic NAT allows you to hide your private addresses behind the public IP addresses assigned to a session. Corporations that need flexibility using different IP address ranges can benefit from this operation, as the private IP addresses will remain the same when the public IP addresses are reassigned.

Megabit Modem 400F, 500L, 600F, and 700F User Manual 87

Key features

Fast Internet access, video on demand, or distance learning
Extends the range of your network
Cost-effective
Ideal for small businesses, home offices, and remote locations

Frequently asked questions

The ADC 400F provides a cost-effective way to extend the range of your network, and it is ideal for small businesses, home offices, and remote locations.

The ADC 400F can be used for fast Internet access, video on demand, or distance learning.

Yes, the ADC 400F is easy to install and can be done by following the instructions in the user manual.