JPS61234141A - Multicircuit controlling system for data communication - Google Patents

Abstract

PURPOSE:To improve the throughput of the titled system without producing any collision by providing a receiver and transmitter at the head end of each communication circuit and at the same time, a circuit controlling means which discriminates whether or not the data received by the receiver is to be transmitted to the receiving terminal of another communication circuit. CONSTITUTION:When packet data are received by a receiver 5a from a communication circuit 1a, a circuit controlling means 6a performs physical checks on the frame, etc. and discriminates whether or not the data are those to be sent to another circuit and when the data are to be transmitted to another circuit, informs the discriminated result through a circuit switcher 7. If it is not necessary to send the data to another circuit, the means 6a gives the data to a transmitting section 4a and sends the packet to the communication circuit 1a. The packet data handed over to the circuit switcher 7 are divided by the switcher 7 at every sending-out circuit and subjected to queuing. At this moment, a circuit controlling means 6c performs such logical checks that whether or not the communication circuit of the addressed terminal is vacant, the address is appropriate, and so forth. After subjecting to the queuing, the packet data are given to a transmitter 4a and sent to the communication circuit 1c to which the said terminal 2''-c belongs.

Description

[Detailed description of the invention]

■Industrial Application Fields] The present invention is applicable to bus-like communication lines 5, such as 0ATV systems.
The present invention relates to a multi-line control system for data communication in which a plurality of terminals are provided, and data is sent and received by each terminal over different communication lines.

[Conventional technology]

As this type of multiple line control system, the one shown in FIG. 4 is known. Here, terminals B-1 and B are connected to mutually independent communication lines -1, △-2, and A-3, respectively.
-2,B-3...3-n, 3'-1,B--2゜8--3-8--n and B''-1,B''-2,B''-
3-...B''I-n are connected, each terminal is equipped with a transmitter/receiver, and each communication line A-1, A-2
In A-3 and A-3, data is sent and received between terminals, but the sending and receiving terminal is, for example, B-1.
When communicating in the form of transmission from a terminal to a 3'-n or 3#-n terminal, the communication line A-1. Through the data transmission/reception control means C-1 located between A-2 or through the communication port MA-1
, A-31J Niarteita 3M receiver 11Jtlj hand JRC
-1°C-2.

[Problems to be solved by the invention]

In this way, each communication line is controlled by a data transmission/reception control means (gate).
In the connection format, data will flow into other communication lines before it reaches the destination terminal, and if other data is being sent or received on the intermediate line or the destination communication line. A collision occurs,
Throughput will drop significantly. The present invention was made based on the above-mentioned circumstances, and it is possible to limit the inflow and outflow of data only between the lines that transmit and receive data.
The present invention aims to provide a multiple line control system for data communications that does not affect other lines and improves the throughput of the entire multiple line system. [Means for Solving the Problems 1] For this purpose, the present invention provides data communication in a case where a plurality of mutually independent communication lines are provided and a receiving terminal is on a different communication line from the communication line of the transmitting terminal. , a line that includes a receiver and a transmitter at the head end of each communication line, and that determines whether the data received by the receiver is transmitted to a receiving terminal on a communication line different from the communication line of the data. The apparatus is characterized in that it comprises a control means and queues packet data based on the judgment of the line control means and the availability of the destination line. [Embodiment] An embodiment of the present invention will be specifically described below with reference to FIGS. 1 to 3. In the figure, symbols 1a, lb, and lc are independent communication lines, and each communication line 1a, Ib, and 1c includes transmitting/receiving terminals 2-a, 2-b, 2-c-2-n, and 2-c. =
-a, 2--b, 2′-c-2--n and 2″
-a, 2"-b, 2"-c-2"-n. A common multiple circuit switching 1+lJ control device 3 is provided at each head end of the communication lines 1a, Ib, 1c. The multiple line switching control device 3 is provided with transmitters 4a, 4b, 4c corresponding to each communication port $118.lb, 10, and receivers 5a, 5b, 5c connected to each communication line. In addition, the receiver 5a is provided correspondingly to the receiver 5a.
, 5b, 5c are input to the line control means 6a, 6b, 6c.
The output sent out via the line switcher 7 is as follows:
The signals are sent to the transmitters 4a, 4b, 4c via the line control means 6a, 6b, 6c. In such a configuration, for example, terminal 2-a and terminal 2#
Assume that data transmission/reception is performed with -c. In this case, the data signal generated by the terminal 2-a constitutes a data transmission packet as shown in FIG. Here, Pl is star 1-frame, P2 is destination address (P2-1 is line No. 1, P2-2 is terminal address)
, P3 is the issuer address (P 3-1 is the line number, , P
3-2 is terminal address), P4 is data length, P5 is data, P6 is Fe2 (frame check sequence), P
l is a stop frame. When the packet data is received by the receiver 5a from the communication line 1a, the line control means 6a physically checks the frame of the packet data and determines whether the data should be sent to another line. If it is sending data, it is notified via the line switcher 7. If it is not necessary to send data to another line, the data is passed to the transmitter 4a and the packet is sent to the same communication line 1a. However, as in the above example, when sending to the terminal 211-c, the line switch The packet data passed to 177 is sorted and queued by the line switcher 7 for each transmission line. At this time, the line control means 6G performs a logical check to see whether the communication line at the destination terminal is free or whether the address is valid. The packet data queued in this way is then passed to the transmission J4c and sent to the communication line 1G to which the terminal 2''-c belongs. Control regarding the algorithm is carried out by the line control means 6G.
It can be used for data communication over TV lines. Most lines in 0ATV are composed of multiple hubs, and each hub is branched into a tree shape to supply video to each terminal (subscriber's home), so each terminal has the above-mentioned transmission and reception. When a terminal with a device is prepared and data communication is performed freely, data communication between each hub can be realized by installing the above multi-circuit switching control device at the head end of 0ATV communication. . In this case, in the above-described embodiment, the 0ATV line is used, and data communication is carried out over broadband. Here, data from terminals 2-a, 2-b, 2=-a, 2'-b, -- and 2''-8, 2''-su, . is used as uplink data, and vice versa, it is assumed that the frequency band is different for uplink and downlink. When communicating between other hubs, the packet is passed to the line control means of the destination line via the line switcher 1. In this case, the line switcher 7 determines the destination line and transfers the packet to the sending buffer 1 of the destination line. Queue. When it is their turn to wait, the packet is passed to the line control means. The line control means determines how busy the destination line is, detects whether the line is free, and sends the packet to the communication line via the transmitter. (Effects of the invention) The present invention has been described in detail above, and only the lines to which the terminals that exchange data belong are involved in the transmission and reception of data, and when data is being transmitted to other lines, , since the corresponding line becomes vacant, the through-top can be improved without causing collisions, and the line can be used efficiently.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a detailed circuit diagram of main parts, Fig. 3 is a diagram showing the contents of a packet, and Fig. 4 is a conventional circuit diagram. . 1a, lb, Ic--communication line, 2-a, 2-b one terminal, 3... multiple line switching control device, 4a, 4b, 4c
m...Transmitter, 5a, 5b. 5C...Receiver, 6a, 6bJc...Line control means, 7...Line switcher. Rice 19 Pu=? Rizuri 3eE' Suiko 4 (Ri

Claims (1)

[Claims] In data communication where a plurality of mutually independent communication lines are provided and a receiving terminal is on a communication line different from the over-reliance line of the transmitting terminal, a receiver and a transmitter are provided at the head end of each communication line, and the above-mentioned receiving The device is equipped with a line control means for determining whether or not data received by the device is to be transmitted to a receiving terminal on a communication line different from the communication line of the data, and the line control means determines whether or not the data is transmitted to a receiving terminal on a communication line different from the communication line of the data, and the line control means determines whether or not the data is transmitted to a receiving terminal on a communication line different from the communication line of the data. A multi-line control system for data communication, characterized in that packet data is queued based on the above.