| 摘要 |
PURPOSE:To secure TSSI(Time Slot Sequence integrity), by providing a cross- connect switch which outputs a parallel signal of (n) bits whose phase is aligned from the input of a parallel signal of (2n-1) bits outputted from a serial-parallel conversion circuit. CONSTITUTION:A frame synchronizing pattern is detected from either plural frame synchronizing pattern detection circuits(300-1-300-n) arranged in parallel is detected, and it is added on the input on one side of a signal switching means 500 as a control signal. Meanwhile, the parallel signal of (2n-1) bits outputted from the serial-parallel conversion circuit 200 is added on the input on the other side of the signal switching means 500. And a switch 5 is switched by the control signal from a frame synchronizing pattern detecting means, and the parallel signal of (n) bits in which a frame synchronizing signal is set at the front and whose phase is aligned is outputted. In such a way, the frame synchronizing signal is set at the front of the parallel output of the cross- connected switch 5, and no mixture of the data of a preceding and a succeeding frames is prevented from occurring, and the TSSI can be secured. |
