PAF Remote Discovery Code of the PME port at CO. A 6 Byte long Discovery Code of the peer PCS connected via the PME. Reading this object results in a Discovery Get operation. Writing a zero to this object results in a Discovery Clear_if_Same operation (the value of efmCuPAFDiscoveryCode at the peer PCS shall be the same as efmCuPAFDiscoveryCode of the local PCS associated with the PME for the operation to succeed). Writing a non-zero value to this object results in a Discovery Set_if_Clear operation. This object does not exist in CPE port subtypes. A zero length octet string SHALL be returned for CPE port subtypes and also when PAF aggregation is not enabled. 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. If a Clause 45 MDIO Interface to the PMA/PMD is present, then this object is a function of 10P/2B aggregation discovery control register, Discovery operation result bits in 10P/2B aggregation and discovery status register and 10P/2B aggregation discovery code register