| 摘要 |
PURPOSE:To improve the utilizing efficiency of a transmission line by providing a call setting control slot to a header part of an information transmission frame on a loop transmission line so as to reduce number of signals required for the call setting control. CONSTITUTION:When a call setting request exists, all fields of a channel state display slot is read sequentially and a reception channel corresponding to the participation node applying two-way communication between multi-points is decided. Then an address of a downstream node of its own node is changed into its own node address, a corresponding channel number is used as a transmission channel of its own node, a channel select means 102 is controlled to set fixedly a channel used for the two-way communication between multi-points and then a slot is sent to the transmission line. Thus, a call setting control slot written with an inter-multi-point two-way communication request is circulated in a loop to allow the node making communication to decide definitely the operation channel of its own node thereby continuing the communication.
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