The value of tmnxSubProfEgrEncapOffsetMode specifies how the fixed packet offset will be derived. This fixed packet offset will be used in the adjustment of the subscriber aggregate rate, to account for the fixed offset and per packet variable expansion of the last mile for the specific session used by the subscriber host. The value 'none (0)' will disable the adjustments. The value 'auto (1)' will derive the fixed packet offset from the encapsulation type value signaled in the Access-loop-encapsulation sub-TLV in the Vendor-Specific PPPoE Tags or DHCP Relay Options [rfc4679].