Wilan LIBRA 5800 AP, Руководство пользователя

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June 2003 Rev 0 139
L
LAN
A localized network linking computers, servers, printers and other peripheral devices. Typical
configuration is within buildings or between closely situated buildings.
Line of Sight (LOS): Free Space
An unobstructed straight line between two transmitting devices. The transmission path is not
established by nor dependent upon reflection, refraction or diffraction. As long as 60 per cent of the
first Fresnel zone is clear, then it may be considered almost equivalent to LOS transmission.
Link budget
The amount of power, expressed in decibels, needed for a radio link to work.
Linktest
A method of proving a new radio link or troubleshooting an existing one. Linktest sends data packets
in both directions and accumulates statistics on the data that indicate how well the link works.
M
MAC address
Media Access Control address. Alphanumeric characters that uniquely identify a network-connected
device.
Management Information Base
See MIB.
Management Port
The DB-9 port on the IDU to which a PC may be attached.
manager
This element is installed on the network’s host computer and is controlled by the network
administrator when used in SNMP. From the host, the manager configures agents, or polls agents for
information.
MIB
Management Information Base. A set of commands that you can execute using the SNMP Manager
to access the MIB database. A standard MIB and a Wi-LAN-customized MIB store information
relevant to the operation of a wireless network.
multipath interference
As a radio signal travels, it may reflect off objects in the environment and take various paths to the
receiver. As a result, the signal arrives at the receiver at different times, confuses the receiver, and
causes bit errors and processing delays. A related type of interference is multipath fading, in which a
reflected signal shifts out of phase with the original signal and cancels it.