BinTec X4000, Руководство пользователя

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X4000 User’s Guide 471
Glossary
CCITT Consultative Committee for International Telegraphy and Telephony
A predecessor organization of the
➤➤
ITU that passed recommendations for
the development of communications standards for public telephony and data
networks and data transmission interfaces.
Channel bundling Channel bundling
One of X4000 ’s features. Channel bundling is a method of increasing the data
throughput. The data throughput is doubled by switching in a second
➤➤
B-
channel for data transmission. Channel bundling can be either dynamic (= on
demand) or static (= always).
CHAP Challenge Handshake Authentication Protocol
A security mechanism during the establishment of a connection with a
➤➤
WAN partner using
➤➤
PPP . This protocol is used for checking the
WAN partner name and the password defined for the WAN partner. If the
partner name and password at both ends are not the same, a connection is not
set up. The user name and password are encoded in CHAP before they are
sent to the partner – as opposed to
➤➤
PAP .
CLID Calling Line Identification
A security mechanism during the establishment of a connection with a
➤➤
WAN partner . A caller is identified by means of his ISDN extension
number before the connection is established. If the extension number is not the
same as the extension number you have defined for a WAN partner, a
connection is not established.
Client A client uses the services provided by a
➤➤
server . Clients are usually
workstations.
Data compression A process for reducing the amount of data transmitted. This enables higher
throughput to be achieved in the same transmission time. Examples of this
technique include
➤➤
STAC ,
➤➤
VJHC and
➤➤
MPPC .
Datagram A self-contained
➤➤
data packet that is forwarded in the network with
minimum protocol overhead and without an acknowledgement mechanism.
Data packet A data packet is used for information transfer. Each data packet contains a
prescribed number of characters (information and control characters).