Glossary - Wi-LAN Hopper Plus 120-24 Installation And Configuration Manual

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
applications installed during the fall or winter months. The problem does not become
evident until the spring when leaves appear.
acquisition code
To minimize the effects of interference, all units in a system use the same acquisition
code so the receivers can distinguish the desired signal from other interfering signals.
agent
In an SNMP context, the agent runs on each unit. An agent accepts configuration
commands from the manager and collects network and terminal information specified in
the MIB.
antenna
A device which accepts electromagnetic energy from a circuit or wire and radiates it into
space rather than confining it.
antenna gain
Gain of the antenna over a dipole (dBd) or isotropic (dBi).
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ARP
Address Resolution Protocol. A low-level protocol that maps IP addresses to Ethernet
addresses. An ARP request is sent 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.
attenuation
Any loss in signal strength, due to resistance, absorption, capacitance or any
characteristic of the medium or design of the system.
DEC 2000 Rev 02
Antennas have a gain associated with them, which is a measure of their ability to
amplify signals in their tuned band.
Antenna gain is achieved by focusing the signal. A higher gain antenna has more
compressed signal.
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