• Dynamic Frequency Selection (DFS) is a wireless channel selection technique that avoids electromagnetic interference with other technologies and services. Because the frequency is shared with other technologies and services, regulations in many countries limit the number of 5-GHz channels available or place additional restrictions on the operation. When operating within limited frequencies, radar detection and avoidance capabilities are required.

• DFS is a capability of the wireless Access Point (AP). DFS can be enabled or disabled on many APs.

• If a wireless AP detects a radar system on a DFS enabled channel, the AP broadcasts the switch channel occurrence to the associated client printers and switches the channel to a non-DFS channel.

• If the wireless AP supports DFS channels, the printer supports connecting to DFS channels through the wireless interface.

• When Wi-Fi Direct is enabled, the printer acts as a Software Access Point and manages the Wi-Fi Direct connections and security. Wi-Fi Direct does not support the DFS technique and cannot operate on DFS channels.

• The Wi-Fi Direct inoperability arises when both conditions are true:

• The printer has Wi-Fi Direct and the wireless interface enabled concurrently.

• The wireless interface is connected to an AP and operates on a DFS channel.

• Disable DFS on the wireless network AP. Then DFS frequencies will not be supported.

• Connect the printer to a 2.4-GHz wireless network. DFS frequencies are not supported on the 2.4-GHz frequency bands.

• Connect the printer to the Ethernet instead of a wireless network.

• If the wireless network supports multiple Base Station IDs (BSSIDs), update the wireless connection of the printer and select any of the available non-DFS channels. The BSSIDs of the wireless network can be found in the Limit Wi-Fi Roaming settings. The non-DFS BSSIDs can be determined depending on the frequency range.