Local loop

The local loop connection is typically a copper twisted pair carrying current from the central office to the customer premises and back again. Individual local loop telephone lines are connected to the local central office or to a remote concentrator.

Local loop connections can be used to carry a range of technologies, including:

• analog voice (for traditional analog telephony)
• ISDN
• ADSL and analog voice
• HDSL[?]
• SDSL
• VDSL

The term "local loop" is also sometimes used loosely for any "last mile" connection to the customer, regardless of technology. Hence the phrase "wireless local loop".

See also:

• loop disconnect[?]
• DTMF
• E and M signaling[?]