This object configures the E1/T1 port's receiver sensitivity, tuned to the signal strength expected from the far end. An admin adjusts it when the incoming signal is attenuated by a long cable run, so the receiver can still reliably detect a weak signal without misreading noise as data. For example, on an E1 port connected over an unusually long copper span, the admin raises the receiver sensitivity so the port doesn't report spurious loss-of-signal alarms.