Jon walks into the campus security office in his telco costume and explains that he has been called out by the local exchange carrier because a circuit appears to be looped from the telco Jon穿着他的电信制服走入场地安全办公室，然后说明他是由本地交换运营商（ local exchange carrier ( lec ) ）派来的，因为看来电路从电话公司形成了回路。
