Posing as a technician in the field, I called Pacific Bell’s Mechanized Loop Assignment Center, or MLAC, also known simply as the Line Assignment Office. A lady answered and I said, "Hi. This is Terry out in the field. I need the F1 and the F2 on 310 837-5412." The F1 was the underground cable from the central office, and the F2 was the secondary feeder cable that connects a home or an office building to the serving area interface, which eventually connects to the F1, all the way back to the central office.