User's Manual

11 Appendix B: Definitions
11.1 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
cellsite.
Access Point
The base station of the network. AP refers to the machinery -
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 conf iguration
commands from the manager and collects network and terminal
information specif ied in the Management I nformation 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.
ASCII
American Standard Code for Information Interchange. A system
used by personal computers to convert letters, numbers and
symbols into binary notation.
Automatic
Frequency
Control
A method by which the CPEs stayed tuned to the correct frequency
for communicating with the AP, despite frequency variations
caused by the hardware.
Attenuation
Any loss in signal strength, due to resistance, absorption,
capacitance, or any characteristic of the medium or design of the
system.
LibraPlus 5860 User Guide Appendix B: Def initions: A Page 79 of 95