This object reports the remote-end optical transceiver's laser bias current in milliamps for this Ethernet port, and only applies when the port's media type is fiber. An admin monitors laser bias current because a value drifting outside the transceiver's expected range often signals an aging or failing optic at the far end before it causes an outright link failure. For example, if cmEthernetTrafficPortStatsRLBC on a fiber uplink has been steadily rising over several weeks, the admin would schedule replacement of the remote SFP before it fails outright.