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A digital current loop uses the absence of current for high (space or break), and the presence of current in the loop for low (mark). [1] This is done to ensure that on normal conditions there is always current flowing and in the event of a line being cut the flow stops indefinitely, immediately raising the alarm of the event usually as the heavy noise of the teleprinter not being synchronized ...
A major application of current loops is the industry de facto standard 4–20 mA current loop for process control applications, where they are extensively used to carry signals from process instrumentation to proportional–integral–derivative (PID) controllers, supervisory control and data acquisition (SCADA) systems, and programmable logic ...
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E for ear, i.e., when the near-end E lead was grounded, the far end was calling and wanted your ear. Whereas M is commonly called mouth, because when the near-end wanted to call (i.e., speak to) the far end, −48 vdc was applied to that lead. E for earth and magneto for M, from the very earliest days of telephony. An actual magneto was used to ...
The four-sides model (also known as communication square or four-ears model) is a communication model postulated in 1981 by German psychologist Friedemann Schulz von Thun. According to this model every message has four facets though not the same emphasis might be put on each.
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Interruption of loop current is variously called open loop disconnect, or an open switching interval. Additional types of loop signaling are signals to the central office that the subscriber intends to initiate a second simultaneous call, a three-way conference call, or answer a second incoming call. This signal is called flashing or hook flash ...