A method of signaling an off-hook or line seizure, where one end closes the loop circuit and the resulting current flow is detected by the switch at the other end.
The most common way of initiating a telephone based communication session. Removal of the hand set from it's cradle closes a circuit loop and allows a current to flow which is detected by the PBX or local exchange.
a type of start signaling. A closed path or circuit over which a signal can circulate. When used on a telephone line, it tests the line, the circuit is closed and reflects received signals to the sender.
A trunk signaling method used to establish an electrical connection between a PBX and the telephone company's switching equipment.
A method of demanding dial tone from the central office by completing an electrical pathway between the outbound and return conductors of a telephone line. Loop start is employed by single-line telephone instruments, for example.
A supervisory signal given by a telephone or PBX in response to completing the loop path.
A method of circuit seizure between central office and station equipment that operates by bridging the tip and ring of the line through a resistance.
In an analog environment, an electrical circuit consisting of two wires (or leads) called tip and ring, which are the two conductors of a telephone cable pair. The CO provides voltage (called "talk battery" or just "battery") to power the line. When the circuit is complete, this voltage produces a current called loop current. The circuit provides a method of starting (seizing) a telephone line or trunk by sending a supervisory signal (going off-hook) to the CO.
With loop start, you "start" (seize) a phone line by bridging through both wires of your telephone line.
The most commonly used method of signaling an off-hook condition between an analog phone set and a switch, where picking up the receiver closes a wire loop, allowing DC current to flow, which is detected by a PBX or local exchange and interpreted as a request for service.
Loop start exists as a supervisory signal that is given at a telephone or PBX as a response to the closing of the loop's DC current path.
In telecommunications, a loop start is a supervisory signal given by a telephone or PBX in response to the completion of the loop circuit, commonly referred to as 'off-hook'. When idle, or 'on-hook', the loop is at 48V DC (provided by the CO or FXO interface). When a telephone or device wishes to use the line, it drops the voltage to approximately 10V DC by closing the loop (going off-hook), and this signals the FXO end to get ready for communication (usually by finding a register on the switch via a line finder, and putting dial tone on the line).