Dell W-Series 304 Instant 6.5.1.0-4.3.1.0 CLI Reference Guide - Page 746

Parameter channel Description Range reduce the radio's transmission (Tx) power to match its new received (Rx) power level. Failure to match a device's Tx power level to its Rx power level can result in a configuration that allows the radio to send messages to a device that it cannot hear. Default Channel number for the AP Depends on - 802.11g/802.11n.802.11ac regulatory physical layer. The available domain channels depend on the regulatory domain (country). Channel number configuration options for 20 MHz, 40 MHz, and 80 Mhz modes: l num: Entering a channel number disables 40 MHz mode and activates 20 MHz mode for the entered channel. l num+: Entering a channel number with a plus (+) sign selects a primary and secondary channel for 40 MHz and 80 Mhz modes. The number entered becomes the primary channel and the secondary channel is determined by increasing the primary channel number by 4. Example: 157+ represents 157 as the primary channel and 161 as the secondary channel. l num-: Entering a channel number with a minus (-) sign selects a primary and secondary channel for 40 MHz and 80 Mhz modes. The number entered becomes the primary channel and the secondary channel is determined by decreasing the primary channel number by 4. Example: 157- represents 157 as the primary channel and 153 as the secondary channel. NOTE: 20 MHz clients are allowed to associate when a primary and secondary channel are configured; however, the client will only use Dell Networking W-Series ArubaOS 6.5.x | Reference Guide rf dot11g-radio-profile | 746