Chapter 1. Before You Start
Air Live IAS-2000 User’s Manual V1.0
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CTS
Clear To Send. A signal sent by a device to indicate that it is ready to receive data.
Database
A collection of data that is organized so that its contents can easily be accessed, managed, and updated.
DDNS
Dynamic Domain Name System. The capability of having a website, FTP, or e-mail server with a dynamic IP
address using a fixed domain name.
Default Gateway
A device that forwards Internet traffic from your local area network.
DHCP
A utility that enables a server to dynamically assign IP addresses from a predefined list and limit their time of use so
that they can be reassigned. Without DHCP, an IT Manager would have to manually enter in all the IP addresses of
all the computers on the network. When DHCP is used, whenever a computer logs onto the network, it automatically
gets an IP address assigned to it.
DHCP Servers
Dynamic Host Configuration Protocol Servers. PCs and other network devices using dynamic IP addressing are
assigned a new IP address by a DHCP server. The PC or network device obtaining an IP address is called the
DHCP client. DHCP frees you from having to assign IP addresses manually every time a new user is added to your
network.
A DHCP server can either be a designated PC on the network or another network device, such as the Router. By
default, the Router’s DHCP server function is enabled.
If you already have a DHCP server running on your network, you must disable one of the two DHCP servers. If you
run more than one DHCP server on your network, you will experience network errors, such as conflicting IP
addresses.
Diversity Antenna
A type of antenna system that uses two antennas to maximize reception and transmission quality and reduce
interference.
DMZ
Demilitarized Zone. A computer or small subnetwork that sits between a trusted internal network, such as a
corporate private LAN, and an distrusted external network, such as the public Internet.
Typically, the DMZ contains devices accessible to Internet traffic, such as Web (HTTP) servers, FTP servers, SMTP
(e-mail) servers and DNS servers.
The term comes from military use, meaning a buffer area between two enemies.