JPH0771096B2 - Data transmission / reception method using multiple loops - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a case where data to be transmitted is distributed and transmitted to each loop and data is received in a slotted ring data communication system having a plurality of loops. Has
The present invention relates to a data transmission / reception method of receiving data without breaking the order of data at a transmission source.

[Conventional technology]

When constructing a large-capacity communication system by the slotted ring method, it is conceivable to adopt a multiple loop configuration in order to suppress an increase in loop speed as shown in FIG. 1 (c). At that time, if each time lot of a plurality of loops is logically treated as a time slot of one loop, the plurality of loops can be efficiently used with various data without using a complicated loop selection algorithm.
In that case, each node on the transmitting side receives information from its own node in an empty time slot of the loop that is logically one,
Send out in order. That is, information is sent across multiple loops. On the receiving side, it is necessary to store the data distributed to each node and transmitted to its own node in the buffer memory without breaking the order of the data at the transmission source and to output it to the terminal or the outgoing line. To this end, it is necessary to know the number of times each of the time slots addressed to the own node, which arrives simultaneously from the plurality of loops, is transmitted from the transmission node. For this reason, conventionally, a counter for each transmitting node was installed in common for multiple loops,
Each loop is monitored in turn within one time slot time,
The counter counts the number of time slots addressed to the own node for each transmitting node, and the write value of the received data to the buffer memory is determined by the count value.

A conventional method will be described with reference to FIGS. 2 (a) and 2 (b). The conventional data communication method using multiple loops is
A loop configuration as shown in FIG. 1 (c) is adopted, and the receiving unit of each node is configured as shown in FIG. 2 (a). Second
The receiving unit in FIG. 10A analyzes data from the loop and takes in data addressed to the own node, a data receiving signal sent from the data analyzing unit 30, and each transmission from the sending node number (SA). A group of counters 10 for counting the number of data reception signals from the beginning of the frame for each node (SA), and a buffer provided for each transmission node corresponding to each loop and storing received data based on the address calculated by the counter It comprises a memory 20 and a data output section 40 for outputting the received data to the outgoing line.

Data from a certain node to its own node is sent by treating a plurality of loops logically as one loop as shown in FIG. 2 (b). For example, 1 in the first slot of loop 1
The second data is stored in the first slot of loop 3, the second data is stored in the second slot of loop 4, the third data is stored in the third slot of loop 2, and the fourth data is stored in the third slot of loop 2. Loop 4 with the 5th data in the 4th slot
The 6th data is sent to the 4th slot. The time slot data is sent with addresses (SA, DA) indicating the transmitting node and the receiving node. In the receiving node, the data analysis unit 30 looks at the DA of the data on the loop and takes in the data addressed to the own node into the node. Furthermore, each
SA of the data to the counter group 10 provided for SA
And send a data reception signal. The counter group 10 sequentially monitors all loops in one time slot, and the SA from the frame head is monitored.
Each time, count how many time throats are coming to the own node through all loops. In other words, in the counter group 10, if data comes from the loop in a certain time slot, the counter value corresponding to the SA of the data is incremented by 1, and the buffer memory corresponding to each SA is used as the address. Write the data to 20. This operation 1
During the time slot time, the process is sequentially performed for all loops. Then, as shown in FIG. 2A, for example, the data is written in the node A buffer memory 20 corresponding to each loop at the position corresponding to the order sent from the node A. For example, if data is transmitted from the node A as shown in FIG. 2 (b), the initial value of the counter for node A in the counter group 10 is set to 0, and the transmitting node A in loop 1 in the first slot. The counter for 1 is incremented by 1 and the data is written to the position of address 1 of loop 1. In loop 3, the counter for node A is further incremented by 1, and data is written in the address 2 position of loop 3. As described above, the data 1 to data 6 are written in the addresses 1 to 6 corresponding to the transmission order of the data in the memory corresponding to the loop to which they are respectively sent. Although only one transmission address has been described above, the above operations are similarly performed in parallel for other transmission addresses by the counter and the buffer memory corresponding to the other transmission addresses. As can be seen from FIG. 2 (a), since data is written in the buffer memory corresponding to the loop at random, all empty areas of the buffer memory are set to 0 in advance, and when the data is output to the output line, all data is output. The same address is given to the buffer memories of the loops, and the outputs of the buffer memories of all the loops are summed and output. If the above-mentioned functions are given to the data output section 40, the data is output to the outgoing line in the order of being sent from the transmitting node, as shown in FIG.

[Problems to be solved by the invention]

In the conventional data transmission / reception system described above, since the buffer memory is provided for each loop, it is sufficient to operate each loop at the speed of one loop, but the counter is common to all nodes and is within one time slot. All loops must be monitored, and when data addressed to the local node arrives at once from all loops, the counter must operate at a speed that is a multiple of the loop speed. Therefore, it is generally difficult to realize a counter that can withstand the speed when a large number of loops are installed, and the operating speed of the counter limits the maximum number of loops that can be installed.

In addition, since the operating speed of the counter depends on the number of loops installed, it is necessary to change the operating speed of the counter when the number of loops is increased. Alternatively, if the counter is designed according to the maximum number of loops from the beginning, there is a drawback that the operating speed of the counter becomes unnecessarily high and the quality becomes excessive even in a system having a small number of loops.

Furthermore, in this method, since the number of received data must be managed for each node, a counter is required for each SA, and the counter can send the data that one node can transmit to another node. Since there is a possibility of sending out, there is a drawback that one counter itself becomes large and the counter group of each node becomes very large.

It is an object of the present invention to adopt a method of generating an address for storing received data in the order in which they are sent from a transmitting node, from a number that indicates the order of the data given by the sending side, It is to reduce the operation speed to a speed corresponding to the loop even when there are a plurality of loops.

[Means for solving problems]

The data transmission / reception method using a plurality of loops of the present invention enables all parts of the data transmission / reception device to operate at a speed corresponding to the loop or less when the plurality of loops are logically regarded as one loop and data is transmitted / received. In addition, when transmitting data, when the data to be transmitted is divided into time slot units, the sequence number SN (Sequential Number) indicating the number of the original data in the time slot unit.
Is a method of adding an address to data in a time slot unit and calculating an address for storing the received data from SA and SN when receiving the data. That is, the present invention is characterized by having the following means.

The data transmission unit of each node has a transmission buffer memory, a data management unit, and a transmission data controller corresponding to each of the plurality of loops.

The transmission data having the same content in each loop is temporarily stored in the transmission buffer memory. The transmission data stored in the transmission buffer memory is divided into time slot units by the data management unit, and a transmission node number, a reception node number, and a data sequence number are assigned to the divided data. The transmission data controller monitors the empty state of the time slots of all loops, and from the empty state of each loop, multiple loops are logically regarded as one loop and the slotted ring that controls the data transmission to the corresponding loop The method is used.

The data reception unit of each node has a data analysis unit and a reception buffer memory corresponding to each of the plurality of loops. The data analysis unit identifies the data addressed to its own node from the data of each time slot on its own loop, calculates the address at which this data should be stored from the transmission node number and sequence number of this data, and stores this address in the reception buffer memory. Accumulate data. The reception buffer memory has a predetermined address area for each transmission node, and stores the reception data addressed to the own node according to an instruction from the data analysis unit. Further, the data receiving unit has a data output unit common to the loop, and synthesizes the data accumulated in the respective reception buffer memories in frame units to obtain the reception data addressed to the own node for each transmission node.

[Work]

As described above, in the data transmission / reception method using multiple loops, data is transmitted over multiple loops. Therefore, when data comes from a plurality of loops at the same time in the same time slot, the data must be written in the buffer memory so that the order sent from the transmitting node can be preserved and output to the outgoing line. Therefore, in the present invention, when the data is divided into units of time slots and sent to one of a plurality of loops, the number SN indicating the position of the original data in the unit of time slots is set to the unit of time slot. Attached to the data. Further, when receiving the data in the time slot unit, the address is directly calculated from the transmission node number SA and the sequence number SN given to the data in the time slot unit. Since this data receiving operation is independent of the states of other loops, the operating speed of the device that stores the received data from multiple loops in the buffer memory is the speed of one loop regardless of the number of loops. Become.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 (a), (b), (c), (d) and (e) are data in which a plurality of loops according to the present invention are used and a plurality of transmission / reception functions and transmission / reception buffer memories are provided for each loop. It is the schematic which shows one Example of a transmission / reception system. A data transmission / reception method using a plurality of loops according to the present embodiment has a function of sending data to a plurality of data transmission paths 120 and receiving data from a plurality of data transmission paths 120 as shown in FIG. 1 (c). It is composed of nodes 110 and 130 having a function, and a data transmission line 120 that forms a loop by connecting the nodes 110 and 130. Further, as shown in FIG. 1 (a), the transmitters of the nodes 110 and 130 are
For each loop, the data to be transmitted from the node is stored in the transmission buffer memory 210 having the same contents, and for each loop, the data is divided into time slot units in advance, and the divided data is divided into the original data. Number SN indicating the order in
Has a data management unit (DMU) 220, and
From the transmission buffer memory corresponding to each loop, the data divided into time slots is monitored for the free state of a plurality of loops, and the plurality of loops are logically regarded as one loop and the data is sent to the corresponding loop. Has a transmission data controller (SDC) 230 for controlling each loop. The receiving units of the nodes 110 and 130 are configured as shown in FIG. 1 (b). That is, provided for each loop, DA, SA, SN is extracted from each time slot, the data addressed to the own node is identified from DA, and the address for storing the data is calculated from the SA, SN of the data addressed to the own node. , A data analysis unit (DAU) 140 that outputs the address to a reception buffer memory 160 corresponding to each loop, and a reception buffer memory that is provided for each loop and stores data transmitted from the corresponding loop to its own node 160, and a data output unit 170 that is provided in common to all loops and collectively outputs the data from the buffer memory placed for each loop to the output line.

Next, the operation of the data transmission / reception method using a plurality of loops according to this embodiment will be described with reference to FIGS. 1 (a), (b), (c), (d),
This will be described with reference to (e). The node 110 is a transmission buffer memory provided for each loop for data to be transmitted.
Store in 210. Transmit buffer memory 210 for each loop
Stores the same content in all. Then, the DMU 220 divides the data stored in the transmission buffer memory 210 installed corresponding to each loop into time slot units, and the data in the time slot unit indicates a sequence number.
Give SN, sending node number SA, receiving node number DA,
Send data to the loop. For example, as shown in FIG. 1 (d), the data transmitted from the node 110 to the node 130 is divided into 5 time slots, and
DA indicating the node 130 and SA indicating the node 110 are added, and SNs 0 to 4 are added according to the order of the data.
The SDC 230 corresponding to each loop of the node 110 monitors the arrival status of the empty time slots of all the data transmission paths 120, and in association with the empty status of the other loops of the node 110, the data sent by the SDCs of other loops. In order not to overlap, that is, when a free time slot arrives in the own loop by using the slotted ring method in which the plurality of loops are logically regarded as one loop and the data transmission to the corresponding own loop is controlled, For example, as shown in FIG.
Data 0 to data 4 are sent from 110 to node 130.

When the node 130 receives the data transmitted from the node 110 to the node 130, first, the DAU1 corresponding to each loop is
At 40, the data transmitted by the data transmission path 120 is monitored. By the way, the data transmitted from the node 110 and others enter the DAU 140 in order from the frame head as shown in FIG. 1 (e). In DAU140 corresponding to each loop, SA, DA, SN is extracted from the data coming into DAU140,
If the DA of the data indicates the node 130, the address for storing the data is directly calculated from SA and SN, and both the address and the data are output to the reception buffer memory 160 corresponding to the loop. That is, the top address of the reception buffer memory 160 corresponding to each SA is determined in advance, the top address corresponding to the SA is selected by the SA of the received data, and the SN is set to the top address corresponding to the SA.
The address added with is the storage address of the data. Then, based on the address, the data is stored in the reception buffer memory 160 corresponding to the loop to which the data is sent. In the example of loop 1 shown in FIG. 1 (e), since data of SN = 0 is transmitted from the node 100 in the first time slot, SN = is assigned to the top address 0 corresponding to SA = 100.
Data is stored in the reception buffer memory 160 corresponding to loop 1 with 0 added as 0 as an address. Further, since the data of SN = 1 is transmitted from the node 110 in the first time slot, the top address 2 corresponding to SA = 110 is 2
The data is stored in the reception buffer memory 160 corresponding to the loop 1 with 3 as an address obtained by adding SN = 1 to. The above operation is continued within one frame. Since the same operation is performed in the other loops, the reception buffer memory corresponding to each loop of the node 130 stores the data transmitted from the other node to the node 130 as shown in FIG. 1 (e). Written every moment.

When the data stored in the buffer memory area is output to the outgoing line, the empty area of the buffer memory is set to 0 in advance as described in the conventional example, and the same buffer memory is used for all loops when reading the buffer memory. The output of the buffer memory of all loops may be summed and output. The node 110
The data can be received by the node 130 and output to the outgoing line in the order sent from the.

〔The invention's effect〕

As described above, according to the present invention, when the data is transmitted from the node, the number SN indicating the order of the data is given to the data in the time slot unit, and when the data is received, the data is directly transmitted from the SA and SN. Calculate the memory address,
By storing the received data in the buffer memory corresponding to each loop, even if there are multiple loops, the nodes are kept operating at the operating speed of one loop and the multiple loops are logically linked to one loop. Therefore, multiple loops can be efficiently managed and operated.

Furthermore, since the majority of nodes are installed in a loop-compatible manner and the operating speed of each part does not depend on the number of loops installed, the same loop-compatible parts are used for small systems with one loop to large systems with multiple loops. The number of installed loops can be easily changed according to the total communication capacity.

Further, in this method, since it is not necessary to manage the number of received data for each node, the counter corresponding to each SA is unnecessary, and the DMU and DAU corresponding to each loop have only simple functions. The configuration of each node becomes simple and the price of the system becomes easy.

And according to the present invention, even if the overall communication capacity increases,
Since the operating speed of the system does not increase, there is an advantage that the system price does not increase extremely even if the total communication capacity increases.

[Brief description of drawings]

1 (a), (b), (c), (d), and (e) are schematic diagrams showing an embodiment of a data transmission / reception system using a plurality of loops of the present invention, and FIG. 2 (a), (B) is a block diagram and a sequence diagram showing a conventional example. 110, 130: node, 120: data transmission line, 140: data analysis unit (DAU), 160: reception buffer memory, 170: data output unit, 210: transmission buffer memory, 220: data management unit (DM
U), 230: Transmit Data Controller (SDC).

Claims (1)

[Claims] 1. A plurality of nodes are connected by a plurality of loops,
A frame with a fixed time period is provided on each loop, the frame is divided into a plurality of time slots, and the data transmission unit of each node of the plurality of nodes divides the data from the own node into time slot units, The loop is regarded as one logical loop and is sequentially transmitted to the empty time slots of the plurality of loops, and the data receiving units of the nodes of the plurality of nodes are distributed and transmitted to the time slots of the plurality of loops. In a slotted ring type data communication system in which data is transmitted between arbitrary nodes by receiving data addressed to its own node without breaking the order at the transmission source, the data transmission unit of each node of the plurality of nodes includes the plurality of loops. The transmission buffer memory for temporarily storing the transmission data of the same contents in each loop, and the transmission buffer The transmission data stored in the memory is divided into time throat units, and the data management unit that assigns the transmission node number, reception node number, and data sequence number to the divided data, and monitors the empty status of the time slots of all loops. A transmission data controller that logically regards a plurality of loops as one loop from an empty state of each loop and controls data transmission to a corresponding empty time slot of the own loop, and each node of the plurality of nodes The data receiving unit of has a predetermined address area corresponding to each of the plurality of loops, has a predetermined address area for each transmitting node, and stores a receive buffer memory for receiving received data addressed to the own node, and each time slot on the own loop. The data addressed to the own node is identified from the data of the And a data analysis unit that stores the data in the reception buffer memory and stores the data in the reception buffer memory, and combines the contents stored in the reception buffer memory for each loop on a frame-by-frame basis in common with the plurality of loops. do it,
A data transmission / reception method using a plurality of loops, comprising a data output unit that obtains received data addressed to the own node for each transmission node.