Siemens EF 711 Series Betriebsanweisung PDF herunterladen (Seite 472)

Glossary

SCALANCE WLC711

A-2 C79000-G8976-C260-03, 07/2012, User Guide, V8.11

asynchronous Asynchronous transmission mode (ATM). A start/stop transmission in which each character

is preceded by a start signal and followed by one or more stop signals. A variable time

interval can exist between characters. ATM is the preferred technology for the transfer of

images.

BSS Basic Service Set. A wireless topology consisting of one Access Point connected to a wired

network and a set of wireless devices. Also called an infrastructure network. See also IBSS.

Captive Portal A browser-based authentication mechanism that forces unauthenticated users to a Web

page. Sometimes called a ‘reverse firewall’.

CDR Call Data (Detail) Record

In Internet telephony, a call detail record is a data record that contains information related to

a telephone call, such as the origination and destination addresses of the call, the time the

call started and ended, the duration of the call, the time of day the call was made and any toll

charges that were added through the network or charges for operator services, among other

details of the call.

In essence, call accounting is a database application that processes call data from your

switch (PBX, iPBX, or key system) via a CDR (call detail record) or SMDR (station message

detail record) port. The call data record details your system's incoming and outgoing calls by

thresholds, including time of call, duration of call, dialing extension, and number dialed. Call

data is stored in a PC database

CHAP Challenge-Handshake Authentication Protocol. One of the two main authentication protocols

used to verify a user's name and password for PPP Internet connections. CHAP is more

secure than PAP because it performs a three-way handshake during the initial link

establishment between the home and remote machines. It can also repeat the

authentication anytime after the link has been established.

CLI Command Line Interface.

Collision Two Ethernet packets attempting to use the medium simultaneously. Ethernet is a shared

media, so there are rules for sending packets of data to avoid conflicts and protect data

integrity. When two nodes at different locations attempt to send data at the same time, a

collision will result. Segmenting the network with bridges or switches is one way of reducing

collisions in an overcrowded network.

Datagram A datagram is ”a self-contained, independent entity of data carrying sufficient information to

be routed from the source to the destination computer without reliance on earlier exchanges

between this source and destination computer and the transporting network.” (RFC1594).

The term has been generally replaced by the term packet. Datagrams or packets are the

message units that the Internet Protocol deals with and that the Internet transports.

dBm An abbreviation for the power ratio in decibels (dB) of the measured power referenced to

one milliwatt.

Decapsulation See tunnelling.

Device Server A specialized, network-based hardware device designed to perform a single or specialized

set of server functions. Print servers, terminal servers, remote access servers and network

time servers are examples of device servers.

Table A-1 Networking Terms and Abbreviations (continued)

Term Explanation

1 2 ... 467 468 469 470 471 472 473 474 475 476 477 ... 491 492

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