| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent drop in transmission efficiency of user data by transmitting a user frame without attaching additional information such as an SSTED trailer to the user frame and making it possible to detect the abnormality of a user frame length in the case of restoring this transmission data. SOLUTION: A user frame dividing means 109 of this data transmitter 101 divides the user frame transferred from a higher layer into a preliminarily defined division length, also stores the number of divided parts, and uses the stored number of divided parts as a UUI being the inter-user display of a CPS packet header including the last data of the user frame. A user frame restoring means 116 of a data receiver 102 counts the number of CPS packets used to restore the user frame in the case of restoring the user frame, compares a UUI with the number of counted CPS packets when user frame assembling is completed, and discards the user frame as frame length abnormality when the values do not coincide.</p> |
