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Automatic Channel Selection

A CANlink® wireless 4000 acting in an Wi-Fi Access Point role can be configured to automatically select the least crowded RF channel.
When configured in this mode, before starting the Wi-Fi interface, the device quickly scans all channels and selects the one with the least traffic on it at that time.

Warn

This does not re-evaluate the selected channel while in use:

  • the channel is not changed according to new interference on that channel, or reduced traffic on another
  • the connection remains on the automatically selected channel until the connection is stopped, and restarted

Automatic Channel Selection (ACS) can reduce interference, and therefore may improve bandwidth and mean latency of the connection in congested environments.

Enabling and disabling

Object to configure

0x3000:0x0F [Access Point WiFi Channel / MiniAP]
This is a 32bit object.

In this object, a value of 0 enables Automatic Channel Selection (ACS).
Any other value will select a specific channel. (See Setting the channel).

This ACS mode is available only on an Access Point device.

Default: 6 (channel 6 in the 2.4GHz band).

Note

The CANlink® wireless 4000 does not support Dual-Band mode when configured as an AP.
If both bands are enabled (or neither), the 2.4GHz band is enabled by default.

Configuration (2.4GHz)

To ensure that the channel is in the 2.4GHz band, only that band must be selected:

  • 0x3000:0x10 [Enable 2.4GHz WiFi] must be set to 1.
  • 0x3000:0x11 [Enable 5GHz WiFi] must be reset to 0.

Configuration (5GHz)

To ensure that the channel is in the 5GHz band, only that band must be selected:

  • 0x3000:0x10 [Enable 2.4GHz WiFi] must be reset to 0.
  • 0x3000:0x11 [Enable 5GHz WiFi] must be set to 1.