Configure Access Point Radio Settings

The country of operation of the access point is automatically detected by WatchGuard Cloud. This determines the maximum transmit power, wireless modes, and the wireless channels available to the access point in the regulatory domain for the region.

Access point sites are unable to determine the country of operation for subscribed devices. Any settings defined in the access point site that are not available for the country of operation for a specific access point are not used by the device.

The wireless frequency band and the country of operation of the access point determine the wireless modes available.

• The 2.4 GHz radio supports:
• 802.11n (default) — This mode enables wireless devices that use 802.11b/g/n to connect with the access point.
• 802.11ax — This mode enables wireless devices that use 802.11b/g/n/ax to connect to the access point.
• The 5 GHz radio supports:
• 802.11ax (default) — This mode enables wireless devices that use 802.11a/n/ac/ax to connect to the access point.
• 802.11ac — This mode enables devices that use 802.11a/n/ac to connect to the access point.

For access point CR device models that you can deploy outdoors or in rugged indoor environments, you can enable the use of indoor channels on the 5 GHz radio to use the correct channels in your region when you deploy the device indoors.

In some regions, the use of outdoor channels on the 5 GHz band is limited or restricted. When you enable indoor channels, the list of candidate channels for automatic or manual channel selection includes all channels available for indoor use in your region.

Caution: Some countries have restrictions on the 5 GHz radio channels allowed for indoor or outdoor use. You are responsible for compliance with regional-based regulations.

• The use of indoor channels on access point CR models requires firmware v2.5.7 or higher.
• You can configure the use of indoor channels only at the device-level configuration for a CR model access point. You cannot configure indoor channel support in an access point site.

Candidate channel selection is different for device-level configurations and access point site configurations.

Device-Level Configuration

• The available channels depend on the country of operation, wireless mode, and channel width you select.
• By default, the preferred channel is set to Auto. In this mode, the access point automatically selects a quiet channel with the least interference from the available channels in the selected band.
• When the access point boots or if the configuration updated and radios restarted, auto channel selection performs a passive scan on every candidate channel for approximately 100ms each. This process takes about 5 to 7 seconds to fully scan both 2.4 GHz and 5 GHz bands.
• The scan takes into consideration any nearby interference and wireless signals, and detects any neighbor access points to help select an optimal channel.
• You can specify the channels available from the Candidate Channels selection list.
• Dynamic Channel Selection (DCS) is also enabled by default that scans the network at regular intervals (default is every 12 hours) to find a channel with the least interference. When an access points reboots or reloads its configuration, the device uses the last channel selected by DCS. If that channel is not available, auto channel selection will select another channel. For more information about DCS, go to Dynamic Channel Selection (DCS).
• You can also select Manual channel selection, that enables you to select a specific channel. Make sure that you select a channel that is not already in use by another access point in your airspace.
• In some regions, you can select DFS (Dynamic Frequency Selection) channels that operate in the 5 GHz band. DFS enables additional available channels for the access point to use that are also shared by radar systems.
• DFS might disrupt connections when the access point detects radar signals. The access point stops transmission if it detects radar signals on that channel, disconnects any clients on the 5 GHz radio, and changes to another available channel. Remove any DFS channels from your available channel list if they cause recurring channel events.
• If a specific channel is not available in the country of operation for an access point, the device does not use that channel. DFS channels are not selected by default.

Access Point Site Configuration

• For an access point site, you select the candidate channels that subscribed access points can choose from with automatic channel selection.
• An access point site is unable to determine the country of operation for access points subscribed to the site. If a candidate channel is unavailable in the country of operation for a specific access point, the device does not use that channel.
• For channel selection on the 5 GHz radio for an access point site, you can select Use All Non-DFS Channels and Use All DFS Channels. DFS enables additional available channels for the access point to use that are also shared by radar systems.
• DFS might disrupt connections when the access point detects radar signals. The access point stops transmission if it detects radar signals on that channel, disconnects any clients on the 5 GHz radio, and changes to another available channel. Remove any DFS channels from your available channel list if they cause recurring channel events.
• If a specific channel is not available in the country of operation for a subscribed access point, the device does not use that channel.
• DFS channels are not selected by default.
• Dynamic Channel Selection (DCS) is not enabled by default in an access point site. For more information about DCS, go to Dynamic Channel Selection (DCS).

The Client Balancing feature utilizes the BSS transition management (BTM) feature of the 802.11v protocol and information about the current state of the network to steer wireless clients to the most optimal access point.

This network optimization helps evenly distribute client connections across multiple access points in dense Wi-Fi deployments. Wireless clients are steered to less-congested access points, even if the signal strength is not as strong as a nearby access point that already has a high number of connected clients.

• Client Balancing is currently only supported on the AP130 and AP330 with firmware v3.1 or higher
• You can only enable Client Balancing in the 2.4 GHz and 5 GHz radio settings of an Access Point Site configuration.
  Client Balancing is not available in the device-level configuration.
• Access points that use Client Balancing must belong to the same Access Point Site.
• Access points must be in the same subnet and on the same broadcast domain.

Depending on the wireless client behavior, the client device might accept or reject the access point client balancing recommendation and make its own selection on which access point and radio to associate with based on the client's internal roaming logic.

When you use Auto channel selection, you can also enable Dynamic Channel Selection to perform regular wireless network scans to evaluate channel utilization and switch to the best channel to prevent co-channel and adjacent channel interference. The access point scans the network based on the configured Scan Interval to find a channel with the least interference.

The access point rescans the network when the DCS scan interval resets or if the DCS configuration is updated and deployed to the access point. A scan does not take place if any other configuration change is performed and deployed to the access point.

• A full DCS scan by an access point takes approximately up to 12 to 15 minutes to scan all radio bands and channels. DCS scans occurs in the background and does not affect connectivity with wireless clients.
• DCS scans are staggered by 15 minutes to prevent multiple access points from scanning the network at the same time.
• For an access point device-level configuration, DCS is enabled by default with a Scan Interval of 12 hours. With this default setting, the scan occurs twice daily at 00:00 and 12:00.
• For an access point site configuration, DCS is disabled by default. If you enable DCS in an access point site, the default Scan Interval is 4 hours. With this default setting, the scan occurs daily at 00:00, 04:00, 08:00, 12:00, 16:00, and 20:00.
• DCS evaluates channels by the number of BSSIDs that use a channel, and the current amount of channel utilization to determine the best channel to use. Any channels with a current utilization greater than 80% are not used.
• Based on the scan results, DCS selects the most optimal candidate channels to choose from.
• If one of these candidate channels is already the current channel, no channel change occurs.
• If the current channel is not in this list, DCS selects a new channel and initiates the channel switch.
• If DCS selects a new channel, the access point notifies wireless clients about the impending channel switch.
• During the channel change, wireless clients temporarily disconnect to change to the new channel.
• Wireless client channel-change behavior is dependent on each individual device. Most clients will accept the channel change and perform a smooth transition to the new channel after a brief disconnection. Some clients might take longer to accept the channel change and reconnect, and in some cases might ignore the channel change request.

DCS might take several seconds to change channels. DCS channel changes can cause disruption to video or voice calls if the channel changes and the wireless client reconnects to the access point. If you frequently encounter these issues, change the Scan Interval to a longer interval, or disable Dynamic Channel Selection and use a static wireless channel.

Interference Mitigation enables the 5 GHz radio to manage the current real-time channel congestion and interference by immediately switching to a less congested channel if the current channel utilization exceeds the configured threshold.

• Interference Mitigation is currently only supported on the AP130 and AP330 with firmware v3.1 or higher.
• The Dynamic Channel Selection feature must be enabled before you can enable Interference Mitigation.
• Interference Mitigation is not supported on the 2.4 GHz radio.

You can configure the Channel Utilization Threshold.

• The default channel utilization threshold is 60%.
• If you set this percentage to lower values, the access point might change channels too often.
• If the percentage is set to higher values, the current channel might become too congested and cause interference before it reaches the threshold to switch to a new channel.
• If the utilization exceeds the threshold three times in 10 seconds, the access point switches to another channel.
• After a channel change, DCS interference mitigation will not scan again for 30 minutes to avoid frequent channel changes.

The channel width controls how broad the signal is and how many frequencies the signal uses. Greater channel widths provide faster speed and throughput, but can cause greater interference in high density areas.

The channel widths available are based on the country of operation for the access point.

We recommend you start with 20 to 40 MHz channel widths. Use higher channel widths only if you require very high application throughput demand in low-density deployments with a small number of wireless devices.

• The 2.4 GHz band supports 20 and 20/40 MHz channel widths. The default is 20 MHz.

  If you use a 20/40 MHz channel width for the 2.4 GHz band, devices will only use 40 MHz in a very quiet deployment with light band utilization. In most cases, devices will use 20 MHz instead of 40 MHz for normal or higher utilization and interference.

• The 5 GHz band supports 20, 40, and 80 MHz channel widths. The default is 80 MHz. Use a 40 MHz or 20 MHz channel width to increase the number of available channels.
• When you configure a 40 or 80 MHz channel width for the 5 GHz radio on your access point radio, neighboring channels are bonded together (2 channels for 40 MHz width and 4 channels for 80 MHz width) to increase throughput. When you enable or disable a bonded channel in the available channels list in the access point radio configuration, the other channels in the bond are also enabled or disabled at the same time.

For an access point site, if an 80 MHz channel width is not available in the country of operation of a subscribed access point, the device uses a channel width of 40 MHz or 20 MHz depending on the country. If the country supports both 40 MHz and 20 MHz, the access point uses a 40 MHz channel width. If the country only supports 20 MHz, the access uses a 20 MHz channel width.

You can optionally set the maximum transmit power on the access point. You can set the transmit power between 8 dBm to 28 dBm, or use the default value of Auto (Max) that uses the maximum transmit power allowed for the country of operation.

The transmit power of an access point contributes to the effective range of the signal that reaches wireless clients. This helps you determine where to install access points to provide sufficient signal coverage in your deployment.

The maximum transmit power available is based on the regulatory limits set by your country of operation for the access point. The transmit power is tested and certified for each access point model for conformity to regional standards. We recommend you review the regulations for your specific country of operation to understand the transmit power limits for the frequency bands and channels available in your region.

You can view the current transmit power for each radio on the device details page and monitoring page for the access point.

The transmit power shown is a best approximation and does not include antenna gain (EIRP). The actual transmit power depends on several factors:

• Any manual transmit power setting you specify
• The maximum power allowed by your regulatory domain
• The maximum power supported by the radio
• The wireless mode, channel, channel width, and data rate (MCS index) you use
• Any antenna gain — The access point antennas add additional gain (~2 to 5 dBi) to the base signal broadcast by the access point. This value is not included in the transmit power approximation that appears in WatchGuard Cloud.

We recommend you use external measurement tools to accurately measure the signal strength of your access points from different areas of your deployment to help determine the optimal transmit power.