| 摘要 |
It is an object to provide a ring-shaped network which can speedily perform initialization even when a plurality of data transmission apparatuses, each performing multi-valued transmission while assigning one or more bits of data as one data symbol to a signal level, are connected thereto, and a data transmission apparatus. The data transmission apparatus outputs received data to a device connected thereto while performing establishment of clock synchronization on the basis of the received data, and when synchronization is established, it resends the received data. On the other hand, when synchronization of the connected device is established, it sends data supplied from the connected device. Further, in the ring-shaped network, a master data transmission apparatus outputs data at turn-on of power or immediately after reset, and a next-stage slave data transmission apparatus receives the data to establish synchronization, and resends the received data when synchronization is established. Thus, synchronization of all the data transmission apparatuses is established while making a round of this data, and then synchronization of devices connected to the respective data transmission apparatuses is established. <IMAGE>
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