JPS5810020B2 - Multipoint communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multipoint communication device that communicates between a parent terminal and a plurality of child terminals.

The conventional multi-point borrowing system uses a polling/selecting function between the parent terminal 1 and the child terminals 21, 22, . . . , n as shown in Fig. 1. 2
1, between parent terminal 1 and child terminal 22, and between parent terminal 1
A center-oriented one-way communication method is known in which communication is performed between the child terminal 2n and the child terminal 2n.

However, in such a system, the child terminal 22
When sending information from the child terminal 2n to the child terminal 2n, the information is first sent from the child terminal 22 to the parent terminal 1, and then from the parent terminal 1 to the child terminal 2n.
This was extremely inconvenient as the information had to be sent to N.

It is an object of the present invention to provide a multi-point communication device which eliminates the above-mentioned drawbacks.

Next, the present invention will be described in detail with reference to the drawings.

Figures 2a and 2b are circuit diagrams of the branch and branch inserts used in the present invention.

In the figure, reference numeral 1 indicates a branching section, which has the function of branching a signal from a terminal 100 into multiple terminals 101 and 102.

Reference numeral 2 indicates an insertion part, and reference numeral 203 is a part that detects whether or not the terminal is making a call (i.e., calling/non-calling), and the detected information is sent to the passage gate 204.
and sent to blocking gate 205.

Reference numeral 206 indicates an OR gate.

Reference numeral 207 indicates a priority means, and when the information input to the terminal 201 indicates a call, the function of the passage gate 204 corresponding to the terminal 202 is stopped, and the "call" is disabled during two-way communication.
prevent collisions.

FIG. 3 shows a schematic diagram of a multi-point passing device of the present invention using branching means, and FIG. 4 is a diagram showing an embodiment of the present invention.

In FIGS. 3 and 4. Center station parent terminal 40
Child terminals 51 to 54 and parent terminal 50 of the sub-center station
The branch part 1 and the branch insertion part 2 explained in FIG.
Branch connection is made at .

These parent terminals 50 and 40 have a known polling function.

Next, communication operations between the parent terminal and child terminal in such a configuration will be explained.

First, if the parent terminal 50 of the subcenter has suspended its polling function, the parent terminal 40 of the center
4 and can communicate by polling.

Since this is the same as conventional polling, further explanation will be omitted.

Next, consider that the parent terminal 50 of the subcenter also performs polling.

Assume that child terminals 51 and 53 are each issuing a communication request in this state.

First, the parent terminal 40 sequentially polls the child terminals 50 to 54, while the parent terminal 50 sequentially polls the child terminals 53 and 54.

It is now assumed that child terminals 51 and 53 are issuing communication requests, and since child terminal 51 is closer to parent terminal 40 than child terminal 53, communication request from child terminal 51 is sent to parent terminal 40.
captured by

On the other hand, the communication request 53 from the child terminal is captured by the parent terminal 50.

Information from the parent terminal is branched by the branching section 1 of the branching means 1 and sent to the child terminal 51, and information from the child terminal 51 is branched by the branching/inserting section 2 and sent to the parent terminal 40.

Similarly, the information from the parent terminal 50 is transmitted to the branching section 1- of the branching means 5.
The information from the child terminal 53 is branched by the branching unit 1 and the branching/inserting unit 2-2, and is also branched by the branching unit 1 of the branching unit 6 and sent to the child terminal 53.
The signal is branched by the branching section 1-3 and the branching/inserting section 2-3 of the branching means 5, and sent to the parent terminal 50.

Here, when sending information from the parent terminal 50 to the child terminal 53, the information from the parent terminal 40 is also input to the branch/insertion unit 2-2, but the branch/insertion unit 2-2 uses the priority means described in FIG. Therefore, information on the parent terminal 40 is not sent to the child terminal 53.

Incidentally, among the branch/insertion sections used in FIG. 4, those without a mark "." do not have priority means.

FIG. 5 shows an example of application of the present invention using two parent terminals of the sub-center station.

FIG. 5a shows that one-way communication is possible between the parent terminal A1 and the seal terminal, and FIG. Indicates that bidirectional communication is possible within the block at the same time.

As described above, in the multi-point communication device of the present invention, not only unidirectional communication but also bidirectional communication is possible.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional multi-point communication system, Figure 3 is a schematic diagram of the present invention, Figures 2a and b are circuit diagrams of the branching means used in Figure 3, and Figure 4 is a schematic diagram of the present invention. A circuit diagram showing an embodiment of the invention and FIGS. 5a" and 5d are diagrams for explaining the invention in detail. In FIGS.
2...branch insertion section, 3-6...branch means, 40°50...parent terminal, 51-54...
...child terminal.

Claims (1)

[Scope of Claims] 1. A first parent terminal for a center station connected to an uplink and a downlink; a second parent terminal for a sub-santa station arranged in a downstream direction from the first parent terminal; At least one first child terminal disposed between the first and second parent terminals; At least one second child terminal disposed downstream from the second parent terminal; At one end. a first means for receiving a signal from the first child terminal at the other end; receiving a signal from the uplink; a first means for preferentially selecting a signal from the first child terminal; a second means for branching a signal to the first child terminal; a third means for inserting a signal from the second parent terminal into the uplink; a fourth means for receiving a signal from the downlink at one end and receiving a signal from the second parent terminal at the other end and preferentially selecting a signal from the second parent terminal; and a fifth means for branching the signal from the downlink for the second parent terminal, and two from the fifth means.
and sixth means for receiving the two branch signals from the uplink line and selectively providing the branch signal to the second parent terminal. A multi-point passing device featuring: