Labels:text | screenshot | font OCR: T-1 CIRCUIT ROUTING Subscriber Central Central office Subschbar POP Loca Interexchange T-1 End-to-End. A cominon method of provisioning a long dis- ince 1 -1 circuit requires an access line to connect each subscriber bration to the interexchange carrier's long distance circuit at a location referred to as a point of presence (POP). If the long dis- tance carrier provides a connection directly into a building, it becomes possible to bypass the local access line commonly provided by'a baby Bell.