JPS61240740A - Data distributing system - Google Patents

Abstract

PURPOSE:To distribute correctly a data even if there is a collision of sending-out data between terminals which have been connected simultaneously, by providing a cue buffer between an incoming line and a distributing switch, and executing this write control by a carrier detection of the incoming line. CONSTITUTION:A cue buffer 12 is provided between incoming lines 5a-5n and a distributing switch 6, and when a carrier is detected by a carrier detecting part 8, line information of its detected carrier is outputted. A cue buffer control part 13 sets the buffer 13 corresponding to the line in which the carrier has been detected, to a writable state, and a data is stored in the buffer 12. Subsequently, if a holding memory 11 of the corresponding line is in a writable state, the corresponding buffer 12 is made readable, and the memory 11 is rewritten so that a distributing operation is executed to the line which has been connected simultaneously from this line. In this way, by providing the buffer 12, the data can be distributed correctly, even if there is a collision of sending-out data between terminals which have been connected simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data distribution system in which data is distributed by simultaneously connecting a plurality of data terminals connected to a digital exchange.

[Conventional technology]

FIG. 2 is a block diagram showing a conventional data distribution system. In the figure, 1a to 1n are lines, 2 is an F8 modem unit, 3a to 3n are line corresponding units, and 4 is a control device.

Next, the operation of the data distribution system with the above configuration will be explained. First, for example, an FS (Frequency Shlf) sent from a terminal (not shown) connected to line 1a.
t) After the signals are demodulated by the FS modulation/demodulation section 2, they are assembled as data by the line correspondence sections 3&--3n. Then, the control device 4 can realize a data distribution function by transmitting the assembled data to, for example, all the lines connected simultaneously to the line 1a.

Further, FIG. 3 is a block diagram showing another conventional data distribution method. In this data distribution method, when a non-procedure data terminal using a modem of the same standard is targeted, the FS signal is distributed to other simultaneously connected terminals as it is transmitted from the terminal.

In the figure, 5a to 5n are incoming lines, 6 is a distribution switch, 7a to 7n are outgoing lines, 8 is a carrier detection unit that detects a carrier and outputs line information of the detected carrier, 9 is a control device, Reference numeral 10 represents a control memory that stores information on the simultaneous connection status of lines, and reference numeral 11 represents a holding memory that controls the operation of the distribution switch 6.

The input line 5a, the output line 7a, the single person line 5b, the output line 7b1 to the person line 5n, and the output line 7n are paired, respectively.

Next, the operation of the data distribution system with the above configuration will be explained. First, when the carrier detection unit 8 detects a carrier, the carrier detection unit 8 stores the information in the holding memory 11 based on the line information on which the carrier was detected and the information on the simultaneous connection state of the lines in the control memory 10 set by the control device 9. Rewrite the content,
The distribution operation of the distribution switch 6 is controlled.

In this way, the distribution operation is performed independently every time the received data changes.

[Problems to be Solved by the Invention] In the conventional data distribution system, especially the data distribution system shown in FIG. Also, the amount of hardware for the line support sections 3a to 3n increases. On the other hand, in the data distribution system shown in FIG. 3, if there is a collision of transmitted data between simultaneously connected terminals, correct data distribution may not be performed.

[Means for solving problems]

In the data distribution system according to the present invention, a queue buffer memory is provided between the input line and the distribution switch. can be done.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of a data distribution system according to the present invention. In the figure, 12 is a FIFO queue buffer, which is initially non-writable and non-readable. Reference numeral 13 denotes a queue buffer control section that controls this queue buffer 12.

However, the holding memory 11 is initially reset and is in a writable state. Further, information on the simultaneous connection state of the lines is set in the control memory 10 by the control device 9.

Next, the operation of the data distribution system with the above configuration will be explained. First, when the carrier detection unit 8 detects a carrier, it outputs the line information of the detected party. The queue buffer control unit 13 puts the queue buffer 12 corresponding to the line in which the carrier is detected into a writable state. Therefore, data is stored in the queue buffer 12. And when the carrier is no longer detected,
The afternoon knee buffer 12 becomes in a writable state.

Then, when the keypad 7a 12 enters a state with data, if the holding memory 11 of the corresponding line is in a writable state, the queue buffer 12 corresponding to this line is made readable, and simultaneous connections are made from this line.

holding memory 1 so that the distribution operation is performed to the
1 is rewritten, and the holding memory 11 corresponding to this simultaneously connected line group is made write-inhibited.

Then, when data is distributed and the queue buffer 12 is in a state where there is no data, reading is disabled, and the holding memory 11 corresponding to the simultaneously connected line group is reset to enable writing. In this way, even if there is a collision of transmitted data between simultaneously connected terminals, it is possible to correctly distribute data.

〔Effect of the invention〕

As explained in detail above, according to the data distribution method according to the present invention, the FS signal received from the terminal currently transmitting data is distributed to other terminals by carrier detection and the state of the queue buffer provided between the distribution switch and the line. Since paths for distributing data to a plurality of simultaneously connected terminals are independently set, data can be distributed correctly even if there is a collision of transmitted data between simultaneously connected terminals.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a data distribution system according to the present invention, and FIGS. 2 and 3 are block diagrams showing conventional data distribution systems, respectively. 1a to 1n...Line, 2...Life/FS modulation/demodulation section, 3
a~3n...Line support section, 4...Φ writing control device%
5JL~5n...Input line, 6...Distribution switch, 7m-7n...Output line, 8...Carrier detection section, 9...Control device, 10... Control memory, 11... Holding memory, 12... Queue buffer, 13... Queue buffer control unit.

Claims (1)

[Claims] In a data distribution system that distributes data by simultaneously connecting multiple non-procedural data terminals using modems of the same standard connected to a digital exchange, a queue buffer is installed between the incoming line and the distribution switch, and the carrier of this incoming line is A data distribution method characterized in that writing to a queue buffer is controlled by detection, a holding memory is controlled by information stored in a memory that stores the state of the queue buffer and a simultaneous connection state of lines, and the operation of the distribution switch is controlled. .