In telephony , a method whereby the signaling circuit E & M leads use the same cable pair(s) as the voice circuit and no filter is required to separate the control signals from the voice transmission . ( 188 )
DIRECT CURRENT SIGNALING (DX SIGNALING)
Meaning of DIRECT CURRENT SIGNALING (DX SIGNALING) in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012