net line build out (1) 0 db (2) 7.5 db (3) 15 db >This option sets the amount by which the network transmit signal will be attenuated.
If using a T1 installed by a Bell Operating Company and terminated with a standard network termination device (also known as a smart jack) then select 0db.
If using private copper or a T1 installed prior to 1990 it may be necessary to reduce the transmit level in order to avoid overdriving the next device in the circuit.
Occasions when 0 db is not the best choice are increasingly rare.