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Note: if on-hook pertains to one state, off-hook pertains to the other. The idle state, i.e., an open loop of a subscriber line or PBX user loop. An operating state of a telecommunication circuit in which transmission is disabled and a high impedance , or "open circuit ", is presented to the link by the end instrument (s).
The signal is applied to the local loop by the switching system for permanent signal treatment to alert an end user (subscriber) of an off-hook condition of the telephone set, i.e. that the telephone handset should be placed on-hook. Before playing the signal, a certain timeout has to elapse, and on some systems an intercept message is ...
A ring generator or ringing voltage generator is a device which outputs 20 cycle sinusoidal AC at up to 110 volts peak to power bells or annunciators in one or more telephone extensions. [4] The output stops if a handset is taken off the hook. In terminology devised by phone phreaks, a ringing generator is a magenta box.
A dial tone (dialling tone in the UK) is a telephony signal sent by a telephone exchange or private branch exchange (PBX) to a terminating device, such as a telephone, when an off-hook condition is detected. It indicates that the exchange is working and is ready to initiate a telephone call. The tone stops when the first dialed digit is recognized.
“But literally, the day after Christmas, on the 26th of December, my phone started ringing off the hook,” he reveals. “I had never experienced that kind of volume in phone calls in my 36 ...
A telephone hook or switchhook is an electrical switch which indicates when the phone is hung up, often with a lever or magnetic button inside the cradle or base where a telephone handset resides. It takes its name from old wooden wall telephones and candlestick telephones , where the mouthpiece was mounted on the telephone box and, due to ...
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An off-hook condition represents a circuit that is in use, e.g., when a telephone call is in progress. An on-hook condition represents an idle circuit, i.e. no telephone call is in progress. A central office originally was a primary exchange in a city with other exchanges service parts of the area. The term became to mean any switching system ...