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The telephone company maintains large battery systems that supply DC line voltage for the operation of analog telephone service at customer locations. The voltage supplied is a compromise between operational needs for reliable service and safety precautions for customers and service personnel. The length of the line to a customer telephone interface presents a resistance across which the central office voltage experiences a drop and therefore the voltage at the customer site may vary. The nominal battery (system) voltage is 52.1 V, based on a 24-cell lead-acid battery. The voltage at a subscriber's network interface is typically 48 V between the ring and tip wires, with tip near ground and ring at -48 V. In the middle 20th century, long loops in many rural areas of North America used range extenders, which operated at 100 or 130 volts to ensure reliable signaling. Some rural switching systems were designed to apply range extenders internally and thus share a few extenders among many lines, while for other lines, one extender was applied externally per line. To ring the telephone to alert a subscriber to an incoming call, the central office superimposes a 20 Hz AC signal, at a nominal voltage of 105 volts, over the DC voltage present on the idle line. Historically several multi-frequency systems have been used, however, for selective alerting of multiple subscribers connected to a party line, for which the A.C. voltage may be as high as 150 V. Polarity To provide cathodic protection against corrosion of line wires, operating potential of telephone lines is typically negative with respect to ground, and the tip side is generally close to the ground potential. Thus, all power supplies for telecommunication equipment are designated to supply a negative voltage.
In the early years of the telephone industry when rotary dial instruments were in use, the polarity when connecting a telephone set to the tip and ring wires was usually important only for properly ringing a telephone, especially in party line service with selective ringing, and for correctly identifying the calling customer on certain party lines for toll calls. When Touch-Tone service was introduced in the 1960s, the dual-tone multi-frequency signaling (DTMF) tone generator also required correct polarity as it depended on the line D.C. voltage for operation. Later Touch-Tone telephones included a diode bridge that eliminated the polarity sensitivity, so that consumer telephone service is essentially immune to reversal today. However, some special circuits, such as some direct inward dialing (DID) trunks, T-1 lines, and ground start lines connected to field side (terminal) equipment, e.g., a corporate private branch exchange (PBX) switch, correctly operate only with proper tip and ring polarity.