| 摘要 |
<p>PURPOSE:To improve the transmission efficiency of a packet by dividing a sending packet into packets whose data length is short depending on the quality of a line. CONSTITUTION:An error detector 103 adds 1 to the content of an error counter 111 if a received frame from a terminal 113 has an error. A line quality deciding device 104 reads the counter 111 at a prescribed period, decides line quality evaluation and sets the said evaluation value in an indicator 110. Packet sending data is given from a high-order level via a terminal 116 and saved in a buffer 107. When a transmission request is inputted to a terminal 114, a packet split controller 100 reads an indicator 110 to decide whether or not split transmission is to be executed. In the case of the split transmission, the packet in the buffer 107 is divided and sent to the line via a HDLC procedure controller 102 via each split packet. Then a packet having long data length is not sent at the deterioration in the line quality thereby improving the transmission efficiency.</p> |
