Functions Of Wlan Devices - Siemens SIMATIC NET System Manual
Industrial ethernet / profinet industrial ethernet
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- Configuration manual (464 pages) ,
- Manual (300 pages) ,
- Operating instructions manual (90 pages)
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Shorter delay times are required for time-critical applications, for example, Voice over IP.
The standard IEEE 802.11r contains amendments which optimize roaming and therefore is
also referred to as Fast BSS Transition (FT).
With FT, the WLAN client must not authenticate every time the access point changes. For
this purpose, the access points are grouped into a mobility domain. The WLAN client
receives the mobility domain ID from the first access point to which it logs on. The log-on
information is buffered within the mobility domain. This logon is valid for all members of the
mobility domain.
Based on the ID, the WLAN client recognizes whether the access point is a member of the
same mobility domain and can therefore log on without delay. Only WLAN clients with IEEE
802.11r support can use the improved roaming or handover functions.
Requirement
● The access points are members of the same mobility domain
● Only possible with WPA2 encryption (WPA2-PSK and WPA2 RADIUS)
See also
Web Based Management for configuring networks (Page 131)
4.6.4
Functions of WLAN devices
Introduction
This section describes certain functions of SCALANCE W devices. For further information on
all the functions, refer to the operating instructions of the individual devices or the
configuration manual.
Authentication and encryption
Authentication and encryption protect a network from unauthorized access. This is achieved
by an exchange of keys or certificates between client and server. There are various methods
that are explained in detail in the SCALANCE W configuration manuals and in the section
"Encryption and data security (Page 58)".
Support of IEEE 802.11n
With SCALANCE W700 devices that support IEEE 802.11n, a data throughput up to 450
Mbps (gross) is possible depending on the version. Detailed information is available in the
section "IEEE 802.11n/ac". These devices also support the following functions:
● Single-User MIMO
● Spatial multiplexing
● Reduced guard interval
Industrial Ethernet
System Manual, 09/2019, C79000-G8976-C242-10
4.6 SCALANCE W components for the Industrial Wireless LAN
SCALANCE network components
207
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