User guide

Glossary
Summit WM20 User Guide, Software Release 4.2218
B
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.
C
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.
D
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.
Decapsulation See tunnelling.