This reports the configured line build-out setting for this BITS output, which compensates the outgoing signal's electrical characteristics for the length of copper cable between this device and the downstream BITS receiver, with the numeric values corresponding to standard T1 cable-length compensation steps in feet. An admin connecting this output to a downstream device over a longer cable run than the default setting assumes would need to increase this LBO value to prevent signal degradation over that distance. For example, a run of roughly 400 feet of cable would typically call for the lbo399 setting rather than a shorter-distance default, to keep the signal within spec at the receiving end.