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73M2901CE ring detection using optocouplers

Posted: 25 Jul 2011 ?? ?Print Version ?Bookmark and Share

Keywords:Optocouplers? ring detection?

Optocouplers have been commonly used for telecom ring detection for many years due to their simplicity and ease of use. This document shows a typical half wave optocoupler circuit. All the components except U1 and D1 are in series, therefore the order in which they are connected is not important. The ring detect circuit must be AC coupled and present a relatively high (60k minimum) impedance to the line with low amplitude AC voltages. This is to prevent the circuit from interfering with the audio signals when the line is in use.

View the PDF document for more information.

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