Plain old telephone service
) is the voice-grade telephone
service that remains the basic form of residential and small business service connection to the telephone network in most parts of the world. The name is a reflection of the telephone service still available after the advent of more advanced forms of telephony such as ISDN
, mobile phones
. It has been available almost since the introduction of the public telephone system in the late 19th century, in a form mostly unchanged to the normal user despite the introduction of Touch-Tone
dialing, electronic telephone exchanges
and fiber-optic communication
into the public switched telephone network
The system was originally known as the Post Office Telephone Service or Post Office Telephone System in many countries. The term was dropped as telephone services were removed from the control of national post offices.
POTS services include:
In the United States, the pair of wires from the central switch office to a subscriber's home is called a subscriber loop. It is typically powered by -48V direct current (DC) and backed up by a large bank of batteries (connected in series) in the central office, resulting in continuation of service during most commercial power outages. The subscriber loop typically carries a "load" of about 300 Ohms, and does not pose a threat of electrocution to human beings (although shorting the loop can be felt as an unpleasant sensation).
Many calling features became available to POTS subscribers after computerization of telephone exchanges during the 1970s and 1980s. The services include:
The communications circuits of the PSTN continue to be modernized by advances in digital communications; however, other than improving sound quality, these changes have been mainly transparent to the POTS customer. In most cases, the function of the POTS local loop presented to the customer for connection to telephone equipment is practically unchanged and remains compatible with old Pulse dialing telephones, even ones dating back to the early 20th century.
Due to the wide availability of POTS, new forms of communications devices such as modems and facsimile machines are designed to use the POTS service to transmit digital information.
While POTS provides limited features, low bandwidth
and no mobile
capabilities, it provides greater reliability than other telephony systems (mobile phone, VoIP
, etc.). Many telephone service providers attempt to achieve "dial-tone availability" more than 99.999%
of the time the telephone is taken off-hook
. This is equivalent to having no dial-tone available less than five minutes each year, an often-cited benchmark in marketing and systems engineering comparisons, called the "five nines" reliability standard.