POTS (Plain old telephone service)

POTS (Plain old telephone service) - the name of the telephone network.

In comparison with the "new" technology VoIP, ATM, ISDN POTS provides:

• full-duplex transmission of audio data with a frequency range from 300 to 3400 Hz;
• adopting a tone;
• the possibility of transmission of caller ID to establish a connection (dial - tone or pulse);
• the provision of additional services with redirection;

Advantages:

• Low-cost endpoint terminals (telephones);
• A wide range of equipment commonly used standards (dial-up, fax, voice);
• No need for employee training;
• Low quality requirements for cable systems;
• Ability to use a common "ground" in the multi-pair cables;

Disadvantages:

• One line POTS allows one connection at a time;
• The long period of communication and call;
• extremely low rate (about 64Kb/s);
• high cost of connectivity and services (for each channel from the client to the telephone exchange put a separate pair of copper wires);
• lack of error correction (in the case of voice traffic), amplitude modulation sensitive to interference;
• Call the high voltage felt by the person (in case of contact with the wires) as an electric shock;
• Unbalanced signal, complicating isolation;