Wilan LIBRA 5800 AP, User Manual

Page: 133 / 156

June 2003 Rev 0 133
Glossary
A
absorption
Antennas mounted too close to “soft” objects, such as trees, may experience a reduction in signal
strength due to absorption. Absorption is most often encountered in antennas installed during fall or
winter. The problem does not start until the spring, when leaves appear.
Access Hub
A group of APs, each serving a group of CPEs. Also called a cell site.
Access Point
The base station of the BWS network. AP refers to the machinery – IDU, ODU, and antenna – that
comprises the link with the wired network. Sometimes AP means the point where the wireless
network touches the wired network.
agent
An agent runs on each unit in a Simple Network Management Protocol (SNMP) context. An agent
accepts configuration commands from the manager and collects network and terminal information
specified in the Management Information Base (MIB).
antenna
A device which takes electromagnetic energy from a circuit or wire and radiates it.
antenna gain
Gain of the antenna over a dipole antenna (dBd) or isotropic radiator (dBi).
• Gain measures of the ability of an antenna to amplify signals in its tuned band.
• Antenna gain comes from focusing the signal. A higher-gain antenna has a more tightly
directed signal.
ARP
Address Resolution Protocol. This is low-level protocol that maps IP addresses to Ethernet
addresses. An ARP request goes out to the network along with an IP address. The node with the
address responds to the request with a hardware address so the transmission can take place.