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 write operations on the gBondBceConfRemoteDiscoveryCode (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 zeroes. For -R subtype ports, the value of this object cannot be changed directly. This value may be changed as a result of a write operation on the gBondBceConfRemoteDiscoveryCode object of a remote BCE of -O subtype, connected to one of the local BCEs associated with the GBS. Discovery MUST be performed when the link is administratively 'down', as indicated by the ifAdminStatus object in the IF-MIB. Attempts to change this object MUST be rejected (in the case of SNMP, with the error inconsistentValue), if the link is 'up' or initializing. This object maps to the TR-159 attribute aGroupDiscoveryCode.