This attribute shall specify the set of MCS at which the station may transmit data. Each octet contains a value representing a rate. Each MCS shall be within the range from 1 to 127, and shall be supported for receiving data. This value is reported in transmitted Beacon, Probe Request, Probe Response, Association Request, Association Response, Reassociation Request, and Reassociation Response frames, and is used to determine whether a BSS with which the station desires to synchronize is suitable. It is also used when starting a BSS, as specified in 10.3.