| 摘要 |
PURPOSE: To avoid remarkable increase of same hardware means of each channel by receiving an HDLC frame common in all channels and supplying a receiving word composed of a data byte and status information connecting with this byte for each PCM channel in the form of frame. CONSTITUTION: An HDLC decoding means 70 removes an HDLC envelope from the data received from a PCM link and supplies usable data at a speed of one information item per interval. The data supplied to a FIFO 73 is read by a word analysis/process means 74, and information to manage an appropriate processing of received presence data 71 together with information on the state of a PCM channel (INF) and the rank of presence bytes in a presence frame (ROC). |
