telecommunication Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that fe ...

, a common battery is a single electrical

power Power most often refers to: * Power (physics), meaning "rate of doing work" ** Engine power, the power put out by an engine ** Electric power * Power (social and political), the ability to influence people or events ** Abusive power Power may a ...

source used to energize more than one circuit, electronic component, equipment, or system. A common battery is usually a string of

electrolytic cell An electrolytic cell is an electrochemical cell that utilizes an external source of electrical energy to force a chemical reaction that would not otherwise occur. The external energy source is a voltage applied between the cell′s two electrod ...

s and is usually centrally located to the equipment that it serves. In many telecommunications applications, the common battery is at a nominal −48 VDC. A central office common battery in the

battery room A battery room is a room that houses batteries for backup or uninterruptible power systems. The rooms are found in telecommunication central offices, and provide standby power for computing equipment in datacenters. Batteries provide direct cur ...

supplies power to operate all directly connected instruments. ''Common battery'' may include one or more power conversion devices to transform commercial power to direct current, with a rechargeable battery floating across the output. Common battery operation largely replaced local batteries in each telephone in the early 20th century. It consists of two ends that emit opposing positive and negative charges

References

Telephony {{telephony-stub

See also

References