18Preface

Acronyms

The following acronyms are used in this guide:

AC

alternating current

AUI

attachment unit interface

CHAP

Challenge Handshake Authentication Protocol

CSU

channel service unit

dBA

decibels audible

DIP

Dual Inline Pins

DSL

digital subscriber lines

DSU

digital (or data) service unit

IP

Internet Protocol

ISDN

Integrated Services Digital Network

ISP

Internet service provider

Kb/s

kilobits per second

LAN

local area network

LED

light-emitting diode

Mb/s

megabits per second

MP

Multilink Protocol

NAT

Network Address Translation

NT1

Network termination type 1

PAP

Password Authentication Protocol

POP

point of presence

PPP

Point-to-Point Protocol

PPPoE

Point-to-Point Protocol over Ethernet

PVC

permanent virtual circuit

ROM

read-only memory

WAN

wide area network

300867-G

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Nortel Networks Instant Internet 400 Unit manual Acronyms, Preface