User`s guide

Cayman 3220-H User’s Guide Glossary
December 2000 3
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.