PAF Discovery Code of the EFMCu port (PCS). A unique 6 Byte long code used by the Discovery function, when PAF is supported. PCS ports incapable of supporting PAF SHALL return a value of all zeroes. Attempts to change this object SHALL be ignored in this case. This object MUST be instantiated for the -O subtype PCS before writing operations on the efmCuPAFRemoteDiscoveryCode (Set_if_Clear and Clear_if_Same) are performed by PMEs associated with the PCS. The value of this object is read-only for -R port subtypes. The initial value of this object for -R ports after reset is 0. This value may be changed as a result of writing operation on efmCuPAFRemoteDiscoveryCode variable of remote PME of -O subtype, connected to one of the local PMEs associated with the PCS. Discovery MUST be performed when the link is Down. Attempts to change this object MUST be rejected with the error inconsistentValue if the link is Up or Initializing. The PAF Discovery code maps to the local Discovery code variable in PAF (note that it does not have a corresponding Clause 45 register)