Scalance W760/W720; Description - Siemens SIMATIC NET System Manual

SCALANCE network components
4.6 SCALANCE W components for the Industrial Wireless LAN
Frame aggregation
With IEEE 802.11n/ac, it is possible to bundle together individual frames to form one larger
frame, a process referred to as frame aggregation. There are two types of frame
aggregation:
● Aggregated MAC Service Data Unit (A-MSDU)
Multiple MSDU frames with the same destination address are bundled and sent as one A-
MSDU. This reduces the network load. Due to their shorter maximum length, A-MSDUs
are mainly suitable for bundling several shorter frames.
● Aggregated MAC Protocol Data Unit (A-MPDU)
Multiple MPDU frames with the same destination address are bundled and sent as one
large A-MPDU. This allows the total throughput to be increased.
The SCALANCE W devices support both types of frame aggregation. You make the settings
on the WBM page "AP 802.11n/ac".
Maximum ratio combining (MRC)
In a multiple antenna system, the wireless signals are received by the individual antennas
and combined to form one signal. The MRC method is used to combine the wireless signals.
The MRC method weights the wireless signals according to their signal-to-noise ratio and
combines the wireless signals to form one signal. The signal-to-noise ratio is improved, and
the error rate is reduced.
4.6.6

SCALANCE W760/W720

4.6.6.1

Description

Figure 4-33
The devices of the SCALANCE W760/W720 product line have a plastic housing in SIMATIC
ET200 design and are intended for installation in a cabinet. Due to their compact space-
saving design, they are particularly suitable for applications in which IWLAN needs to be
integrated cost-effectively in a device. The client module SCALANCE W722-1 RJ-45
provides support of the iFeatures and is therefore suitable for real-time applications such as
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SCALANCE W761-1 RJ-45 access point
System Manual, 09/2019, C79000-G8976-C242-10
Industrial Ethernet