This object records the remote-end optical transceiver's laser bias current in milliamps for this Ethernet port during the archived historical interval, applicable only when the port's media type is fiber. A historical trend helps the admin confirm exactly when the remote optic began drifting toward failure, useful for justifying a proactive remote transceiver swap. For example, if a remote-site fiber link failed last month, the admin would review cmEthernetTrafficPortHistoryRLBC from the preceding weeks to see if bias current had already been climbing.