| 摘要 |
PURPOSE:To simplify the scale of circuit constitution by applying multiple processing to accumulated counting of a parity decision bit checking each line quality, corresponding to reception and demodulation of a burst signal sent from plural slave stations, via a count means including prescribed alarm deciding counter and RAM. CONSTITUTION:A parity decision bit 102 is counted in time division at each slave station while being controlled by a timing signal 105 sent from a timing circuit 2 in an error decision counter 4, and stored respectively to a designated address corresponding to each slave station of an RAM 3 while being controlled by a timing signal 104 as a history reference for accumulated count of the parity decision bit in the timing of the next frame. If the accumulated acount of the parity decision bit of a line corresponding to a slave station exceeds a specified threshold value determined in advance, it is decided that the line quality corresponding to the slave station has deterioration and a prescribed code error rate deterioration alarming signal 107 is outputted from the RAM 3.
|
