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Definition of "Central Battery Or Common Battery" |
A battery that serves as a single source of electrical energy, in the form of direct current, for more than one circuit and perhaps for more than one connected device.The common battery may supply energy for an entire system, such as a central office or PBX, and the circuits connecting that system to terminal devices. In a telephone company application, the common battery provides loop current for the CO and a great many local loops. In many telecommunication applications, the common battery is 48 volts. / In telecommunication, loopback, or a loop, is a hardware or software method which feeds a received signal or data back to the sender. It is used as an aid in debugging physical connection problems. As a test, many data communication devices can be configured to send specific patterns such as all ones on an interface and can detect the reception of this signal on the same port. This is called a loopback test and can be performed within a modem or transceiver by connecting its output to its own input. A circuit between two points in different locations may be tested by applying a test signal on the circuit in one location, and having the network device at the other location send a signal back through the circuit. If this device receives its own signal back, this proves that the circuit is functioning. |
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