This read-only string gives the functional name of the LED itself, such as location_led, port12_led, active_led, power_led, fault_led, status_led, or subslot(n)_led, distinguishing which of several LEDs on the same module is being reported. An admin relies on this to know exactly which indicator to look at physically, since a single CHM2 card can expose LEDs for up to twelve ports plus power, fault, and status lamps. For example, ledName returning 'Port6' on a CHM2 card tells the operator the reading concerns the sixth port's LED, not the card-level fault_led.