| 摘要 |
PURPOSE:To carry out the circuit process, the simplification of the software structure and the facilitation of countermeasure for the overload traffic by providing which inhibits the change detection via plural units of the cue buffer and the cue overflow in accordance with the circuit state change. CONSTITUTION:Telephone subscriber SUB is stored in the digital telephone exchange via subscriber circuit LC which monitors the state of the subscriber circuit, and the aural signal is changed to the digital signal via A/D converter CODEC. Call detector circuit CDL is connected to the multiplying circuit storing the circuit, and the output is memorized in cue buffer memories Q1, Q2 ... according to the change of the circuit state. And in case memories Q1, Q2 ... have overflow due to the overload traffic, the overflow is detected through overflow detector circuit OVF to inhibit the detection of each circuit state. As a result, the circuit process can be ensured along with the simplification of the software structure and the facilitation of the countermeasure for the overload traffic respectively. |
