Contec FX-DS540-APDL-U, User Manual

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2. Functions and Wireless Link Mode
FX-DS540-APDL-U
11
2. Functions and Wireless Link Mode
This chapter describes the major functions of the FLEXLAN DS540 series as a wireless LAN system and
the wireless link modes of the FX-D540-APDL along with configuration examples of networks available
in the wireless link modes.
Roaming Function
The roaming function maintains the connection to the LAN by automatically changing the access point
to which the user unit is connected when the unit moves. If access points are positioned so as to cover
the entire area where the wireless LAN is to be available, the user unit can be used from anywhere.
When the w ireless link mode of a FLEXLAN-DS540 user unit is “ Standard Infrastructure ” or “ Compatible
Infrastructure
”, it is designed to continuously monitor the AP (access point) signal strength and change to
the AP that provides the most reliable communications.
In the following example, the signals from the APs do not cover the entire range in which the mobile
station UU1 moves and therefore the connection to the wired LAN is lost when UU1 is in position (2).
AP1
OK
UU1
(1)
UU1
UU1
OK
AP3
NG
(2)
(3)
AP : Access point (FX-DS540-APDL/APL)
UU : User unit (FX-DS540-PCD/PCC/PCC2)
PO
W L
L
P O
WL
L
Figure 2.1. Roaming Function 1