| 摘要 |
PURPOSE: An apparatus for monitoring received data in a T-S(Time-Space) switch structure of a switching system is provided to prevent the loss of transmitted data by monitoring whether the loss of an HDLC(High level Data Link Control) frame level data received to a specific channel from a block linked with a T-switch is generated and reporting it to an upper-level processor. CONSTITUTION: An apparatus for monitoring received data in a T-S(Time-Space) switch structure is comprised of a channel selection part(10), an HDLC flag detection part(20) and a received data search part(30). The channel selection part(10) extracts the received data of a specific time slot and a sampling clock having the same cycle as that of the received data among data(RxD) received according to a frame synchronization signal(FS). The HDLC flag detection part(20), after sampling the received data inputted from the channel selection part(10) by a sampling clock and detecting a flag from a bit stream, outputs a control signal to monitor the generation of an error at an HDLC frame level of the data received to the received data search part(30). The received data search part(30) samples the received data of a specific channel supplied from the channel selection part(10) using the sampling clock according to an HDLC flag signal(HDLC start) supplied from the HDLC flag detection part(20) and detects a data bit stream. In case that a transmission-interrupted bit stream is detected, the received data search part(30) outputs a signal for the generation of the abnormal data bit stream to an upper-level processor or an operator side.
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