| 摘要 |
PURPOSE:To prevent ineffective storage of a buffer, by processing a data transmitted previously as an error at a receiving side DTE, if there exists a gap in a data between a receiving side STDM and the DTE owing to the generation of underrun. CONSTITUTION:If the underrun takes palce during the transmission of a data 9 in successiong to a flag 8 when a data is transmitted from a statistical time division multiplexer STDM5' to the data terminal DTE1', a flag 11 is transmitted immediately to the DTE1'. When the receiving side DTE1' receives it, since the data error check is attained by using two-byte before the final flag 11 as an FCS, it is discriminated as an error with the CRC operation. As a result, the DTE1' takes it as data error, and the entire data received before are thrown away as the error. A transmission control section 17 monitors always the state of the transmission data buffer 16, and transmits a flag pattern from a flag pattern generating section 14 when the buffer 16 is made idle before the flag 11 is extracted from the transmission data buffer 16. |
