| 摘要 |
<p>PURPOSE:To establish a communication link while a communication device is only equipped with two transmitting receiving parts by selecting one line with a line selecting switch and connecting a high order transmitting receiving part and a low order transmitting receiving part to the low order transmitting receiving part and the high order transmitting receiving part of other station. CONSTITUTION:Out of plural communication devices 1-7, one device is made into the highest order station, other device is made into a low order station, a tree-shaped logical circuit network is constructed, and respective communication devices have a high order transmitting receiving part and a low order transmitting receiving part to communicate with the communication device to position at the high order and low order of its own station. Control parts 211-217 control line selection switches 241-244 for these transmitting receiving parts, select one line, connects it, and the channel table is transferred to the communication device to position at the low order. Thus, the transmitting receiving part of its own station is connected to the high order transmitting part of the low order station, the low order transmitting part of its own station is connected to the high order transmitting receiving part of the low order station respectively and the link is established.</p> |
