He claimed that he and Poulsen had made a nighttime visit to the Sunset central office in West Hollywood. But their visit had turned up some things they hadn’t seen before. They found the place strange: unlike other COs, it was equipped with unusual computer terminals and tape drives, "looking like something from an alien planet." One refrigerator-sized box had various types of equipment humming inside it. They came across a manual identifying the device as a Switched Access Services unit—SAS for short. When Poulsen started leafing through the manual, he realized that SAS was meant for line testing, which sounded like it meant you could connect onto any phone line.