JPH04354225A - Inter-equipment communication control system for exchange system - Google Patents

Abstract

PURPOSE:To reduce buffer memory capacity, to reduce the development cost and the product cost and to improve a packet data relay capability between buses by simplifying a packet data relay function between buses in inter-bus connection device so as to simplify the circuit configuration of the inter-bus connection device and the software configuration. CONSTITUTION:Communication control means 111, 121, 211, 221 of respective configuration equipments 110, 120, 210, 220 execute data packet communication among the configuration equipments and especially a retransmission control function and a flow control function are directly executed among the configuration equipments. A frame relay control means 20 of an inter-bus connection device 10 realizes only a packet frame relay function of a data packet among the configuration equipments.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling communication between devices in a switching system, and more particularly to a method for controlling communication between devices in a switching system in which a plurality of component devices are connected to a plurality of internal communication buses in a distributed manner. .

0002

2. Description of the Related Art Conventionally, in a switching system in which a plurality of component devices are connected to a plurality of internal communication buses in a distributed manner, as shown in FIG. , 120, 210, 220 and an inter-bus connection mechanism 10. Each component device has communication control means 111, 121, 211, 221 for communicating with other component devices or inter-bus attachment mechanism 10.
have. The inter-bus connection mechanism 10 also includes communication control means 60 and 70 for communicating with the constituent devices, and a packet relay control means 50.

Data communication including retransmission control and flow control between the component device 110 and the component device 220 is performed by the component device 11.
0 and the communication control means 60 of the inter-bus connection mechanism 10, and the communication control means 2 of the component device 220.
21 and the communication control means 70 of the inter-bus connection mechanism 10, and the packet relay between the two internal communication buses is executed by the packet relay control means 50. That is, retransmission control and flow control in data communication control are realized separately for each internal communication bus.

This operation will be explained with reference to FIG. Communication control means 111 and communication control means 60 in FIG.
The frame structure between the frames is as shown in FIG. It was necessary to convert the frame structure to the one shown in FIG. 4(b). In this case, the inter-bus connection mechanism 10 executes frame conversion processing, retransmission control, and flow control.

[0005]

[Problems to be Solved by the Invention] In this conventional device-to-device communication control system, it is necessary to provide the inter-bus connection mechanism with a communication control means having a retransmission control function and a flow control function. The problem is that the control software configuration becomes complicated, and in particular, the amount of buffer memory required becomes large. Furthermore, there is a problem in that the amount of time required for relaying data communication packets between buses in the inter-bus connection mechanism is large, which limits the amount of data communication between buses.

An object of the present invention is to provide an inter-device communication control method for a conversion system with a small buffer memory capacity and a large data communication capacity.

[0007]

[Means for Solving the Problems] In the inter-device communication control method of the switching system of the present invention, a plurality of component devices are distributed and connected to a plurality of internal communication buses interconnected by an inter-bus attachment mechanism. In the switching system, each of the component devices has a communication control means for performing data packet communication between the component devices, and in particular directly executes a retransmission control function and a flow control function between the component devices, and the connection between the buses The mechanism has a frame communication means that realizes only a packet frame relay function of data packets between the constituent devices.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an exchange system according to an embodiment of the present invention. This exchange system consists of an internal communication bus 10
Component devices 110, 120, connected to 0,200,
210, 220, and an inter-bus connection mechanism 10. Each component device 110, 120, 210,
220 has communication control means 111, 121, 211, and 221 for communicating with other component devices, and directly executes a retransmission control function and a flow control function of data packet communication between the component devices. The inter-bus connection mechanism 10 is comprised of frame communication means 30 and 40 and frame relay control means 20 for realizing packet frame relay of data packets between component devices.

Next, the operation of this embodiment will be explained. Packet frame relay of data communication between the component device 110 and the component device 220 is performed by the communication control means 1 of the component device 110.
11 to the inter-bus connection mechanism 1 via the internal communication bus 100.
0, and the frame communication means 30, frame relay control means 20, and frame communication means 4 of the inter-bus connection mechanism 10
0, and reaches the communication control means 221 of the component device 220 connected on the internal communication bus 200. Data packet retransmission control and flow control are directly controlled between the communication control means 111 and the communication control means 221, and the inter-bus connection mechanism 10 only performs packet frame relay processing.

As shown in FIG. 3(a), the structure of a packet frame transmitted and received between the communication control means of two component devices consists of a destination address section, a control section, a source address section, and a data section. It is configured. In FIG. 1, the communication frame from the communication control means 111 to the communication control means 221 has a structure as shown in FIG. The frame is transferred to the relay control means 20 and transferred to the internal communication bus 200 via the frame communication means 40. Since the destination address matches its own address, the communication control means 221 receives this frame and executes retransmission control and flow control with the communication control means 111 indicated in the source address field (A111). do. In other words, the inter-bus connection mechanism 10 only performs frame relay, and does not perform frame conversion, retransmission control, or flow control.

0012

As described above, the present invention simplifies the function of relaying packet data between buses in the inter-bus connection mechanism, thereby simplifying the circuit configuration and software configuration of the inter-bus connection mechanism. It has a small capacity and has the advantage of being able to reduce development costs and product costs, as well as increasing the ability to relay packet data between buses.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an exchange system showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional example of an inter-device communication control method of a switching system.

FIG. 3 is a diagram showing the packet frame structure of the present embodiment, in which (a) shows the packet frame structure transmitted and received between the communication control means of the component devices, and (b) shows the communication between the component devices 110 and 220. FIG. 3 is a diagram showing a packet frame structure in the case of FIG.

FIG. 4 is a diagram showing a conventional packet frame structure,
3A shows a packet frame structure between the component device 110 and the inter-bus connection mechanism 10, and FIG. 2B shows a packet frame structure between the inter-bus connection mechanism 10 and the component device 220.

[Explanation of symbols]

10 Inter-bus connection mechanism 20 Frame relay control means 30, 40 Frame communication means 50 Packet relay control means 60, 70 Communication control means 100,200 Internal communication bus

Claims (1)

[Claims] 1. In a switching system in which a plurality of component devices are distributed and connected to a plurality of internal communication buses interconnected by an inter-bus attachment mechanism, each of the component devices receives data packets between the component devices. carry out communication,
In particular, it has a communication control means that directly executes a retransmission control function and a flow control function between component devices, and the inter-bus attachment mechanism includes frame communication that realizes only a packet frame relay function of data packets between the component devices. 1. An inter-device communication control method for an exchange system, characterized by having a means.