Assertion: supervision signal | /r/HasProperty | inband
Facets:
value: at 2600 hz
type: TEMPORAL
value: primarily
type: DEGREE
value: in the middle 20th century
type: TEMPORAL
Source sentences:
text: In the middle 20th century, supervision signals on long-distance trunks in North America were primarily inband, for example at 2600 Hz, necessitating a notch filter to prevent interference.
text: In the middle 20th century, supervision signals on long-distance trunks in North America were primarily inband, for example at 2600 Hz, necessitating a notch filter to prevent interference.