A discovery Code of the G.Bond port (GBS). A unique 6 octet long code used by the discovery function. This object must be instantiated for the -O subtype GBS before writing operations on the gBondBceRemoteDiscoveryCode (Set_if_Clear and Clear_if_Same) are performed by BCEs associated with the GBS. The initial value of this object for -R subtype ports after reset is all zero. For -R subtype ports, the value of this object cannot be changed directly. This value may be changed as a result of writing operation on the gBondBceRemoteDiscoveryCode object of remote BCE of -O subtype, connected to one of the local BCEs associated with the GBS. Discovery must be performed when the link is down. Attempts to change this object must be rejected (in case of SNMP with the error inconsistent value), if the link is Up or Initializing. This object maps to the TR-159 attribute aGroupDiscoveryCode.