PURPOSE: To decrease the number of transfer data and to recover quickly an error of the missing data, by recovering locally the missing of the data occurred between a data communication device and a repeating device.
CONSTITUTION: If data is missed between data communication devices, the same data is transmitted again until the transmission of the data is confirmed or the number of retransmissions reaches a certain level or more. Noticing this fact, a repeating device informs only the missing of the data at a time point when the data transferred to the 2nd data communication device 2 from the 1st data communication device 1 via the repeating device is missed between data communication devices 1 and 2 and repeating devices 31 and 32. After this, the repeating device reports the missing of data to the device 1 for the retransmitted data from the device 1, and the device 2 transmits the missed data again. Thus an error can be recovered for the missing data.
SUGITA NOBUHIRO
YOSHIKAWA YOSHIO
OOTOMO TAKESHI
ATSUMI TOSHIAKI
NIPPON TELEGRAPH & TELEPHONE
OKI ELECTRIC IND CO LTD
NIPPON ELECTRIC CO
HITACHI LTD
| JPS5249709A | 1977-04-21 |