A circuit arrangement by which trunks provided over a carrier system are made busy to the switching equipment in the event of carrier system failure , or during a fade of the radio system. ( 188 )
PILOT MAKE BUSY (PMB) CIRCUIT
Meaning of PILOT MAKE BUSY (PMB) CIRCUIT in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012