Description: The RFI notch parameter. It is a string consist of begin tone index, end tone index and psd value. This is a string of 4 groups of values in the following structure: Octets 0+1 - Index of start sub-carrier used in the context of a first group Octets 2+3 - Index of end sub-carrier used in the context of a first group Octet 4+5 - The psd value configurated in the first group Octets 6-11 - Same, for a 2nd group This architecture continues until octets 22-23, which are associated with a 4th group.It can contain as most as 4 groups.