Руководство Пользователя для Netopia 3220-h

Cayman 3220-H User’s Guide

Glossary

December 2000

CHAP

Challenge-Handshake Authentication Protocol. Security protocol in 
PPP that prevents unauthorized access to network services. See RFC 
1334 for PAP specifications Compare PAP. 

client

Network node that requests services from a server. 

CPE

Customer Premises Equipment. Terminating equipment such as 
terminals, telephones and modems that connects a customer site to 
the telephone company network. 

CO

Central Office. Typically a local telephone company facility 
responsible for connecting all lines in an area. 

compression

Operation performed on a data set that reduces its size to improve 
storage or transmission rate. 

crossover cable

Cable that lets you connect a port on one Ethernet hub to a port on 
another Ethernet hub. You can order an Ethernet crossover cable 
from network supply companies such as Black Box.

CSU/DSU

Channel Service Unit/Data Service Unit. Device responsible for 
connecting a digital circuit, such as a T1 link, with a terminal or data 
communications device. 

CTS 

Clear to Send. Circuit activated in hardware flow control when a 
modem (or other DCE) is ready to accept data from the computer 
(or other DTE). Compare RTS, xon/xoff. 

data bits

Number of bits used to make up a character.

datagram

Logical grouping of information sent as a network-layer unit. 
Compare frame, packet. 

DCE

Digital Communication Equipment. Device that connects the 
communication circuit to the network end node (DTE). A modem 
and a CSU/DSU are examples of a DCE. 

dedicated line

Communication circuit that is used exclusively to connect two 
network devices. Compare dial on demand.