Weidmuller GPRS Alarm Unit - Manual (Page 90)

Glossary
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9 Glossary
This chapter provides a list of all abbreviations and special terms used
in this Manual with their meanings.
A
• AT commands
The term 'AT commands' is used for the commands that were
originally used by the company Hayes and thus have become
quasi-standard for configuring and parameterising modems.
B
C
D
• DNS
The Domain Name System (DNS) is one of the most important
services on the Internet. The DNS is a distributed database that
manages the name space on the Internet. Generally, the DNS is
used to convert names to addresses (forward lookup). This is
comparable with a telephone book that resolves the names of the
subscribers into their telephone numbers. For example, you can
remember the domain name www.wikipedia.de very easily,
whereas the related IP address 207.142.131.236 is not so easy to
remember.
• DHCP
Dynamic Host Configuration Protocol. An IEFT (Internet
Engineering Task Force) protocol. The Dynamic Host Configuration
Protocol is the function used by the DHCP client to fetch a TCP/IP
address from a central computer (DHCP server). The DHCP server
assigns the client this IP address from a defined address range
dynamically. In other words: The client is always assigned a new,
but unambiguous IP address so that DHCP can supply, for
example, mobile PCs, with IP addresses.
• Download
Download is a technical term from the field of IT. During a
download, the data are requested from a remote station (e.g.
network computer, Internet) and transferred to the computer. The
download is thus the opposite to the upload.