JPS60180253A - Multiple address communication system - Google Patents

Abstract

PURPOSE:To realize an instantaneous form multiple address communication system without provision of a control means the same as that of a terminal device in a network by providing a prescribed multiple address circuit to a data terminal device having a carrier on/off control type semi-duplex communication means. CONSTITUTION:Data terminal devices 1-5 are connected respectively to a multiple address circuit 16 via a subscriber lines 6-10, subscriber exchanges 11, 12, a relay exchange 13, a PCM multiplex converter 14 and a time division multiplex highway 15. The multiple address circuit 16 consists of a means detecting a channel corresponding to a terminal device setting a carrier in a reception frame at each prescribed group and a means transmitting simultaneously a transmission data from a detected terminal device to a channel corresponding to a terminal device during carrier off belonging to the same group. The provision of the multiple address circuit in this way allows the instantaneous form multiple address communication system without the provision of the same control means as that of the terminal device in the network.

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a system for transmitting data, etc., and in particular, a method for automatically transmitting information from a terminal having a carrier signal to other terminals within a group in a semi-universal communication system. This relates to a method of broadcasting communications.

Conventional technology and problems Conventionally, when performing broadcast communication between multiple data terminals, the same 4M control procedure as that of the data terminals is provided in the network, and one-to-one communication is performed between multiple data terminals.
A method has been considered in which the data to be broadcast once during communication is accumulated within the network, and then the data accumulated within the network is sequentially distributed to other data terminals by one-to-one communication. However, as the number of types of terminals increases, the number of control procedures to be covered within the network increases, making the communication device more complex and increasing the cost.

Purpose of the Invention The present invention is intended to solve the problems of the prior art, and its purpose is to realize an instant broadcast communication system without providing the same control procedure as the terminal in the network. If the data terminals are capable of carrier-on-off controlled half-duplex communication, the present invention provides a method that allows data terminals having the same protocol to perform broadcast communication regardless of the protocol. There is a particular thing.

Structure of the Invention The broadcast communication system of the present invention uses a carrier on/off control type half-duplex communication control procedure in which the transmitting carrier is turned on only when transmitting a data signal, and when there is no data to be transmitted, the transmitting carrier is turned off and waits for data communication from another terminal. Connect multiple data terminals to the telephone switching network and distribute data to each terminal in a fixed order.
In a configuration in which terminals communicate with each other using frames configured by multiplexing channels set a, means for detecting channels corresponding to terminals that have turned on carriers in received frames for each predetermined group; By providing a rerouting circuit consisting of a means for simultaneously allocating transmission data from a terminal that has received a carrier to a channel corresponding to a terminal whose carrier is off that belongs to the same group, it is possible to transmit data in a rerouting group consisting of six or more terminals as described above. This allows communication to take place.

Embodiment of the Invention FIG. 1 shows an example of a connection configuration of the present invention, in which 1 to 5 are data terminals having a carrier 0N10FF controlled half-duplex communication control procedure, and 6 to 1o are data terminals that connect the data terminals to a switching network. Bad subscriber line, 11.12 is LS (subscriber line switch)
, 13 is an RS (relay switch), 14 is a PCI multiplex converter that multiplex converts analog signals into digital codes, 1
5 is a time division multiplex highway, and 16 is a broadcast circuit.

FIG. 2 is an illustrative example of the present invention, where 17 is a time division multiplex highway (input) and 18 is a time division multiplex highway (output). In this figure, nr* az
JILs+ ('41-j') Seiruku iv 7'
A and bl, bar '6jl+ b4. ... consists of Group B (which accommodates other signals), Group A
α1. There is a transmission request (carrier transmission) in group B, and α2 except α1 is included in A) due to the circulation circuit.
．． αa, a4. The signal of α1 to ... is b2 in B
The signal of b2 is routed to < b1 + bar b4 + . . . and output to the time division multiplex highway (output) 18 . In addition, a no-signal pattern is output to the time division multiplex highway (output) 18 for the channel for which the transmission request has been made.

FIG. 3 shows an embodiment of the present invention, and the operation of this figure will be explained below in conjunction with the example of FIG. 2. A time-division multiplex highway (input) 17 that accommodates the numbers of groups A, H, etc. is connected to a data bus memory 19, and is sequentially stored frame by frame at an address corresponding to the channel number of the highway, and at the same time carrier detection is performed. It is connected to the circuit 20, and the presence or absence of a carrier is determined for each channel in the time division multiplex highway (input) 17. In the case of this example, it is determined that there is a carrier in the 1st and 5th channels, and the determination results are output by time division multiplexing in an order that matches the channel configuration of Highway 17, and are input to the write control circuit 21. Control 1 is performed so that the output of the channel number sending circuit 22 is written to the transmission request storage memory 26 only at the channel time position where the carrier is present. A channel number is sent to clearly indicate which channel of highway 17 corresponds to. On the other hand, the group number storage memory 24 has addresses for n channels corresponding to the channels of the highway 17, and stores in advance the group to which each channel belongs, such as A or B, and stores the channel number output path. The contents of the address column 25 are read out in synchronization with the output phase of 22, and are used as the write address of the transmission request storage memory 25.

The transmission request storage memory 25 has a number of addresses capable of accommodating the number of groups set according to the method, and according to instructions from the group number storage memory 24, for example, in the case of this example, address A→
73-+, 4-+, 4-+ fj→...73-+1
Access is made for writing in the order of 3 → river → A. In the write cycle, the channel number sending circuit 22 sends 1.2, 3. ..., n and the channel number are sent,
In phase with this, a write enable signal is generated from the write control circuit 21 only at the channel position where it is determined that carriers are present. Therefore, in the address corresponding to the group number in the transmission request storage memory 25, for example, 1° is written for A and 5 is written for B. Further, the transmission request storage memory 26 is controlled to leak ω' according to the output of the address counter 25 corresponding to the n channels, and according to the output of the group number storage memory 24 that sends the group number, and the output of this example is Case 1, 5, 1, 1, 5. ...
,5,5. . . , sends channel numbers in the order of 1.

Output of address counter 25 and transmission request storage memory 23
The outputs of the data bus memory 19 are identified by the matching circuit 26, and if they do not match, the output data of the sending memory memory is made the read address of the data bus memory 19. If they match, the data bus memory 19 is controlled and the data bus memory The no-signal pattern N stored in advance in 19 is read out and sent out. As a result, the time division multiplex highway (output) 18 receives N.

b2. αl, α1. N,...b2+ b*+...α
1 data can be sent out and a broadcast communication can be made.

As explained in detail about the invention, an instant broadcast communication system can be realized by detecting a terminal's transmission request (carrier transmission) without providing the same procedure as the terminal in the network. It has the advantage of being able to realize circular communication between electronic blackboards, interactive information exchange between six or more personal computers, and the like. In addition, as long as the data terminal is carrier 0N10FF controlled half-duplex communication, it is possible to perform broadcast communication between data terminals with the same protocol, regardless of the protocol, so it is suitable for a wide range of terminal types. This circular communication method has the advantage of being applicable.

[Brief explanation of the drawing]

FIG. 1 is an example of a connection configuration according to an embodiment of the present invention, FIG. 2 is an explanatory example of an embodiment of the present invention, and FIG. be. 1...Data terminal, 6-10...Subscriber line, 11.
12...LS (subscriber line exchange), 16...rs
(relay exchange), 14... PCM multiplex conversion device, 15
...Time division multiplex highway, 16...Return circuit, 1
7... Time division multiplexing (input), 18...
Time division multiplexing (output), 19... Data bus memory, 20... Carrier detection circuit, 21... Write control circuit, 22... Channel number sending circuit, 2
6... Transmission request storage memory, 24... Group number storage memory, 25... Address counter, 26...
Coincident circuit patent applicant Nippon Telegraph and Telephone Public Corporation (1 other person) Representative patent attorney Gobe Tamamushi (2 others) Figure 2 of 1

Claims (1)

[Claims] Multiple data terminals have a carrier on/off control type half-duplex communication control procedure that turns on the transmitting carrier only when transmitting data signals, turns off the transmitting carrier when there is no data to transmit, and waits for data communication from other terminals. In a configuration in which communication between floors is performed using a frame yc configured by connecting to the main switching network and multiplexing channels with channels assigned to each terminal in a fixed order, the channel corresponding to the terminal that turned on the carrier in the received frame is set in advance. Means for detecting each predetermined group and sending messages from detected terminals
A broadcasting circuit comprising a means for simultaneously allocating data to channels corresponding to carrier-off terminals belonging to the same group is provided, and broadcasting communication is performed in a broadcasting group consisting of three or more terminals. method.