About: http://webisa.webdatacommons.org/378207006

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	In one embodiment, the attenuation control signal output from controller 160 is a digital signal converted into Vacs by digital to analog (D/A) converter 180 for input by optical power attenuator 150.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com