Glossary
SCALANCE W786-xPRO
242
Operating Instructions, Release 08/2007, C79000-G8976-C221-02
Broadcast address
A broadcast in a computer network is a message with which data packets are sent by one
node to all other nodes of a network. If a message is intended for all nodes in a network, a
broadcast address is used as the destination address.
DFS
Dynamic Frequency Selection. With the Dynamic Frequency Selection function, that is also
part of the 802.11h expansion, an automatic channel change is possible if another user or
technical device is discovered on a channel during operation. This includes, for example,
radar systems that also transfer data in the 5 GHz frequency band. Before a channel is used,
it is checked to make sure that no other system is already using the channel or frequency
range. If another user is discovered, data transmission on the channel is stopped and the
device changes to a free channel.
This is intended to avoid influence by WLAN systems operating according to 802.11a in the
5 GHz band.
DHCP
Dynamic Host Configuration Protocol
ESS
Extended Service Set. ESS is a link between two or more cells of a WLAN (BSS - Basic
Service Set) and a larger mobile wireless network.
Firewall
One or more devices that allow or prevent data access to interconnected networks according
to given security restrictions.
Handover
A handover is the procedure in a mobile wireless network (for example a mobile wireless
network complying with IEEE 802.11) during which the mobile client changes from one cell
to another or from one channel to another while a data connection exists.
HTTPS
HyperText Transfer Protocol Secure
Protocol for the encryption and authentication of communication between Web server and
Web browser in the World Wide Web.
HTTPS is an expansion of HTTP for secure transmission of confidential data with the aid of
SSL.
IEEE
Institute of Electrical and Electronics Engineers