Communication managing apparatus and data communication method

摘要

A communication managing apparatus (CMA) that manages transmission of data employing a token passing system in a network in which a plurality of communication apparatuses (CAs) are connected via a transmission line. The CMA includes a network-presence checking unit performing network presence checking processing for transmitting, by broadcast, a network presence check frame for recognizing the CAs, receiving, from the CAs, frames including thereof, and generating connection information indicating a connection state via the ports. The CMA further comprises a unit determining token circulation order using the connection information, a setup processing unit performing, based on the token circulation order, setup processing for notifying the communication apparatuses of a communication apparatus to which a transmission right is giving next, and a data-fame-communication processing unit performing transmission and reception of a data frame using a token frame.

主权项

1. A communication managing apparatus that manages transmission of data employing a token passing system in a network in which a plurality of communication apparatuses are connected via a transmission line, the communication managing apparatus comprising:
a plurality of ports connected to the communication apparatuses adjacent thereto via a transmission line; a network-presence checking unit configured to perform network presence checking processing for transmitting, by broadcast, a network presence check frame for recognizing the communication apparatuses present in the network, receiving, from the communication apparatuses, network presence check response frames including a connection relation between two adjacent communication apparatuses that exchange the network presence check frame and a connection relation of the ports between the adjacent communication apparatuses, and generating network connection information indicating a connection state via the ports between the two adjacent communication apparatuses; a token-circulation-order determining unit configured to determine token circulation order using the network connection information; a setup processing unit configured to perform, based on the token circulation order, setup processing for notifying the communication apparatuses in the network of one of the two adjacent communication apparatus to which the transmission right is given next; and a data-frame-communication processing unit configured to perform transmission and reception of a data frame using a token frame.