This object sets the line build-out for a DS1 (T1) line, a setting that tunes the transmit signal for either a specific cable-loss attenuation pad (0 to -22.5 dB) or a specific cable-length range (0 to 655 feet), depending on which coding scheme the interface hardware uses. An installer configures this so the signal strength matches the actual copper run to the far end, preventing signal reflections or excessive attenuation that would cause errors. For example, an administrator wiring a short in-building T1 run might set this to value 4, selecting the "0-133ft" build-out option.