A Made IT project
The Local Loop is the line from the customer premisis to the local telco office. This line connects you to the nearest facility of the local PTT. The cable used is generally 26 AWG unshielded twisted pair cable (but it can be fiber also), with runs of about 2.5 miles or 4 km length. Most lines do carry only a single call, but more calles are possible (ISDN, xDSL). The Local Loop is terminated at two points. One is the connection at the customer premisis and the other is the connection to the channel bank or mux at the local telco office.
There are two types of connections:
To assure electrical consistency over the entire analog copper line loading coils are placed in the line. Loading coils can not be used in digital links, because they absorb digital pulses.