transmit power level modulation profile as well as the cyclic prefix length to be used as calibration is implementation specific and is intrinsic to the device itself emoca devices should appropriately calibrate their secondary channel front ends as they would their primary channel front ends during the node admission process and subsequently during the lmo moca nodes are required to transmit as well as process transmissions of the type u2018 probe u2019 as described in 1 emoca nodes transmit and receive probes on all active channels primary and secondary as scheduled by the map frame 514 received on the primary channel 501 as per 1 nodes that have received a transmission of the type u2018 probe u2019 are expected to generate responses called u2018 probe reports u2019 and send them to the originator of the probe also as per 1 depending on the link being profiled and the u2018 link state u2019 of the node these responses may be relayed through the nc likewise as per 1 during the node admission sequence moca nodes need to additionally transmit and receive frames of type u2018 power control u2019 emoca nodes transmit and receive power control frames on all active channels u2014 primary and secondary as scheduled by the map frame 514 received on the primary channel 501 further as per 1 nodes that have received a transmission.