About: http://webisa.webdatacommons.org/112771603

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The two-wire four-wire circuit receives and supplies a signal from and to the modulation and demodulation circuit by using a light receiving element and a light emitting element such as a photodiode.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com