ePMP Scanning AP List & DFS Alternative Frequency Configuration

This document provides high level description of the following:
• SM scanning mode LED indication
• SM Preferred AP List configuration
• AP DFS alternative frequency configuration

SM Scanning Mode LED Indication
During the SM scan process, the SM will control LEDs to indicate the scanning process is in progress. When the SM is in scanning mode, the SM will first set RF LED3-> ON, RF LED2-> OFF, RF LED1-> OFF for 0.5 seconds, then set RF LED3-> OFF, RF LED2-> ON, RF LED1-> OFF for 0.5 seconds, then RF LED3-> OFF, RF LED2-> OFF, RF LED1-> ON for 0.5 seconds. This process will continue until SM is connected to the AP. Once the SM is registered the RF LEDS will then indicate the received RSSI signal strength from AP.

SM Preferred AP List Configuration
SM can be forced to register to specific AP’s only, in order to simplify network planning and load balancing, by configuring “Preferred AP List”. “Preferred AP List” can be configured from SM’s GUI, in the Configuration->Radio page. To add an AP to the list, user should enter the SSID of preferred AP, “Wireless Security” mode and “Pre-shared Key”, if the AP is in “WPA2” mode. The following “Wireless Security” modes are supported – “EAP-TTLS”, “WPA2” and “Open”. If the “Wireless Security” mode of the preferred AP is not “WPA2”, then the “Pre-shared Key” should be blank.

If the “Preferred AP List” is not empty and if SM does not detect any preferred AP, it will continue the scanning process until a preferred AP is detected. If more than one preferred AP is detected, then SM must select a preferred AP based on “Network Entry RSSI Threshold” and “Network Entry SNR Threshold” specified in the network entry criteria. The default values of “Network Entry RSSI Threshold” and “Network Entry SNR Threshold” are -85dBm and 0 respectively. These values can be configured in “Power Control” section of Configuration->Radio page.

A maximum of 16 APs can be added to “Preferred AP List”.

Figure 1., below, shows a Preferred AP List table, with 5 preferred APs.

AP DFS Alternative Frequency Configuration
DFS (Dynamic Frequency Selection) is required for FCC 5.4GHz and 5.2GHz bands, ETSI 5.4GHz and 5.7GHz bands and other countries that require DFS detection. When the radar signal is detected at the primary channel (“Frequency Carrier” in Web GUI), user has the option to move the device’s operating frequency to an alternative frequency channel. The ePMP supports 2 different alternative frequencies. When the primary channel detects DFS, the operating frequency can be moved to “Alternative Frequency Carrier 1”, if the alternative frequency 1 is configured. When the alternative frequency 1 channel detects DFS, the operating frequency can be moved to “Alternative Frequency Carrier 2”, if the alternative frequency 2 is configured. User can select the different channel bandwidth for each alternative frequency.

By default, no “Alternative Frequency Carrier” fields are configured. Figure 2., below, shows the “Configuration->Radio” page with default DFS alternative frequency configuration. Note that alternative frequencies are marked as “-“.

Figure 3., below, shows the “Configuration->Radio” page with “Alternative Frequency Carrier” fields configured. Note that the channel bandwidths of the alternative frequency carriers are different from the primary channel (“Frequency Carrier”).