A signal sent from the called to the calling station, i.e., from the original data sink to the original data source. ( 188 ) Note: Backward signals are usually sent via a backward channel and may consist of supervisory, acknowledgment, or control signals.
BACKWARD SIGNAL
Meaning of BACKWARD SIGNAL in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012