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ISM
Industrial, Scientific, and Medical. It is the family of license-exempt radio bands in North
America and some European countries. It is also referred to as part 15.247 in the FCC
regulation that defines the parameters for use of the ISM band in the U.S., including
power outputs, spread-spectrum, and noninterference.
L
link monitor
A Hopper Plus 120-24 utility that sends known data over an active system to test the
reliability of the RF link. The link monitor information is overhead, that is, it reduces the
amount of available payload for message data.
LOS (Line of Sight)
LOS is a elliptical pattern known as the Fresnel Zone, which must be kept clear of
obstructions. Visual line of sight must be achieved. When standing at the antenna position,
you must be able to see the remote antenna.
M
MAC address
Media Access Control address. Alphanumeric characters that uniquely identify a
network-connected device.
Management Information Block
See MIB.
manager
When used in SNMP, this element is installed on the network s host computer and is
controlled by the network administrator. From the host, the manager configures agents, or
polls agents for information.
MIB
Management Information Block. The MIB is a database which is accessed by a specific
set of commands that you can execute using the SNMP Manager. There is a standard MIB
and a Wi-LAN customized MIB that stores information relevant to the operation of a
wireless network.
multipath interference
Multipath is a form of diffraction in which the reflected signal arrives at the receiver at
different times which confuses the receiver. Multipath may be interpreted as interference
by the receive antenna, and can result in bit errors and processing delays.
O
OID nodes
Object Identifier Nodes. These are the individual nodes in a MIB. See SNMP and MIB.
