JPH0771066B2 - Data transmission equipment - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention assigns the data of each data terminal to a preset channel between the time division multiplex communication apparatuses to which a plurality of data terminals are connected, and assigns the data to the preset channel. More particularly, the present invention relates to a data transmission device that configures and transmits a frame, and particularly when changing a correspondence relationship between a data terminal and a channel to which data of the data terminal is assigned, the change is easily performed without stopping communication operation. The present invention relates to a data transmission device capable of performing.

TECHNICAL BACKGROUND OF THE INVENTION As one of communication systems for data communication in recent years, for example, as shown in FIG. 4, a plurality of data terminals 1l to 1n are connected to a low speed line 2l.
.About.2n to connect to the time division multiplex communication device 3, this time division multiplex communication device 3 is connected to another similar time division multiplex communication device 3'through the high speed line 4, and each data terminal 1l to. A data transmission apparatus has been developed in which 1n data is assigned to n time-division channels CH1 to CHn as shown in FIG. 5 to form a frame for time-division multiplex transmission.

FIG. 6 shows the details of the conventional configuration of the time division multiplex communication devices 3 and 3 '. The time division multiplex communication devices 3, 3'include a transmission multiplex processing unit 3a, a reception multiplex processing unit 3b, and The low-speed line connection adapters 3Cl to 3Cn connecting between the processing units 3a and 3b and the respective data terminals 1l to 1n, and the frame information designating the correspondence between the respective data terminals 1l to 1n and the channels CHl to CHn. It is composed of a storage unit 3d for storing and a communication control unit 3e for controlling each of the above units.

In such a configuration, for example, the time division multiplex communication device 3
When transmitting data from the side, the communication control unit 3e of the time division multiplex communication device 3 reads the frame information from the storage unit 3d in synchronization with the transmission clock for the high speed line 4, and according to this frame information, each low speed line connection adapter 3Cl- 3Cn is set to the receiving operation state in order from the one corresponding to the first channel CHl to receive the transmission data from each of the data terminals 1l to 1n,
These transmission data are time-division multiplexed to the high-speed line 4 by allocating these transmission data to the corresponding channels CH1 to CHn in one frame by the transmission multiplexing processing unit 3a.

On the other hand, when receiving data, each time one frame of data is received from the time division multiplex communication device 3'of the other party,
The low-speed line connection adapter 3 corresponding in order from the first channel CHl according to the frame information stored in the storage unit 3d
Cl ~ 3Cn is selected, and the data assigned to each channel CHl ~ CHn is converted to the corresponding low speed line connection adapter 3C.
The data is distributed from l-3Cn to the data terminals 1l-1n via the low-speed lines 2l-2n and transmitted.

By the way, in this type of system, channel CHl
It may be necessary to change the correspondence between ~ CHn and each of the data terminals 1l to 1n.

In such a case, conventionally, the communication operation of the time division multiplex communication device 3, 3 ′ is temporarily stopped, and the information stored in the frame information storage unit 3d in this stopped state, that is, the data terminal of any function for each channel is used. The information indicating whether or not to allocate data is changed by the operator independently in each time division multiplex communication device 3, 3 '.

[Problems of background art] However, as described above, in the case of temporarily stopping each time division multiplex communication device and changing the setting independently of each other, the speed of the data terminal is changed. There is a problem in that the operation efficiency is reduced because the communication operation has to be stopped every time an expansion or expansion occurs.

Further, if the setting change operation is erroneous, there is a problem that the data is erroneously transmitted to another data terminal other than the target data terminal, and the reliability is lowered.

[Object of the Invention] The present invention provides a data transmission apparatus which eliminates the above-mentioned problems and can change the correspondence between a data terminal and a time division channel without lowering operation efficiency and reliability. The purpose is to do.

[Summary of the Invention] In the present invention, data of each data terminal is assigned to a preset channel between time-division multiplex communication apparatuses to which a plurality of data terminals are connected, and a frame is constructed by the channel and transmitted. In addition, in the data transmission apparatus, each of the time division multiplex communication apparatuses has a storage unit that stores frame information indicating a correspondence relationship between a data terminal and a channel to which data of the data terminal is allocated. When changing the correspondence relationship with the channel to which is assigned, the function information indicating the function of each data terminal is assigned to each channel and transmitted between the time division multiplex communication devices, and the functions are matched based on the function information. Select only the data terminal and reassign the channel to the data of the data terminal with the same function However, the above object is achieved by providing a frame structure control means for updating the frame information stored in each storage means of the time division multiplex communication device in response to this reallocation.

[Examples of the Invention] Hereinafter, the present invention will be described based on illustrated examples.

FIG. 1 is a block diagram showing an embodiment of a communication control section 3e which is a main part of a time division multiplex communication apparatus adopted in a data transmission apparatus according to the present invention, and a transmission multiplex processing section 3a (see FIG. 6). ) And the reception multiplex processing unit 3b for multiplexing the transmission data of each data terminal 1l to 1n and reproducing the received data, and the data terminal 1l.
1n and channels CHl-CHn are changed, each data terminal 1 is connected between the time division multiplex communication devices 3, 3 '.
The function information indicating the functions of l to 1n is assigned to each channel and transmitted, and the channels are reassigned only to the data of the data terminals whose functions of the data terminals 1l to 1n match, and in response to this reassignment. Frame configuration control means 32 for updating the frame information stored in the respective storage parts 3d of the time division multiplex communication devices 3, 3 ', and frame configuration information storage control means 33 for storing the updated new frame information in the storage part 3d. It consists of and.

Next, the operation when changing the frame information with the above configuration will be described. For the sake of simplicity, the storage unit 3d of the time division multiplex transmission device 3 has channels CH1 to CHn and data terminals 1l to 1n in a corresponding relationship as shown in FIG.
The function numbers D11 to D18 of the data terminals showing the correspondence of 1n are stored in advance, and the data terminals are stored in the storage section 3d of the time division multiplex communication device 3'in the correspondence shown in FIG. 2 (b). It is assumed that the function numbers D11 to D18 of are stored in advance,
Finally, the storage unit 3d of the time division multiplex transmission devices 3 and 3 '.
A case in which the contents of (1) are changed to those shown in FIG. 2 (c) will be described.

FIG. 3 shows the frame information stored in the storage unit 3d of the time division multiplex transmission device 3 from the contents shown in FIG.
When the contents shown in FIG. 2A are changed and the frame information finally stored in the storage unit 3d of the time division multiplex transmission devices 3 and 3'is changed to the contents shown in FIG. 2C, It shows various information transmitted and received between the time division multiplex communication devices 3, 3 '.

First, in the time division multiplex communication device 3, when an instruction to change frame information is given by an operator's instruction, and new frame information shown in FIG.
The time division multiplex communication device 3 transmits a change start notification message to the time division multiplex communication device 3 '.

When the time division multiplex communication device 3'receives this change start notification message, it stores the second pre-change message stored in the storage unit 3d.
The frame information shown in FIG. 3B is read and transmitted to the time division multiplex communication device 3.

On the other hand, when the time division multiplex communication device 3 receives the frame configuration information of the partner device 3 ', the data terminal of each data terminal which can be identified by the function numbers D11 to D18 corresponding to each data terminal in this frame information. Speed and type,
Compare the speed and type of the data terminal in its own frame structure based on the new frame information that was input with function numbers D11 to D18, select only the data terminals that match both functions, and select that The frame information relating to the data terminal is newly created and transmitted to the time division multiplex communication device 3 '.

When the time division multiplex communication device 3'receives the frame information, the time division multiplex communication device 3'writes and updates the information in the storage unit 3d, and returns a change end notification message to the time division multiplex communication device 3.

Upon receiving the change end notification message, the time division multiplex communication device 3 writes the newly created frame information in the storage unit 3d and updates the contents of the storage unit 3d.

As a result, the storage units of the time division multiplex communication devices 3 and 3 '
The contents of 3d are changed and set to the contents shown in FIG. 2 (c).

[Effect of the Invention] As described above, according to the present invention, when changing the correspondence relationship between a data terminal and a channel to which data of the data terminal is assigned, the time division multiplex communication devices are connected to each other by each data terminal. The function information indicating the function is assigned to each channel and transmitted, only the data terminal having the matching function is selected based on the function information, and the channel is reassigned to the data of the data terminal having the matching function. Since the frame information stored in each storage means of the time division multiplex communication device is updated corresponding to the allocation, the frame information indicating the correspondence relationship between each channel and the data terminal can be obtained without stopping the communication operation. It can be changed in cooperation with the other party's time division multiplex communication device. Therefore, it is possible to prevent a decrease in reliability due to an error in setting the frame information and also a decrease in operational efficiency.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a communication control section which is a main part of a time division multiplex communication apparatus of a data transmission apparatus according to the present invention, and FIG. 2 is a view showing contents of frame information before and after change. FIG. 3 is a diagram showing various kinds of information transmitted and received between time division multiplex communication devices when changing frame information, and FIG. 4 is a diagram showing an example of a data transmission device using a conventional time division multiplex communication device, FIG. 5 is a diagram showing a relationship between a transmission unit of one frame and a time division channel, and FIG. 6 is a block diagram showing a detailed configuration of a time division multiplexing communication device of a conventional data transmission device. 1l ~ 1n ... data terminal, 2l ~ 2n ... low speed line, 3, 3 '...
... time division multiplex communication device, 4 ... high speed line, 3e ... communication control unit, 3d ... storage unit, 31 ... multiplex control means, 32 ... frame configuration control means, 33 ... frame configuration information storage control means.

Claims (1)

[Claims] 1. A time division multiplex communication apparatus to which a plurality of data terminals are connected, assigns data of each data terminal to a preset channel, forms a frame by the channel, and transmits the data. The division multiplex communication apparatus is a data transmission apparatus having storage means for storing frame information indicating a correspondence relationship between a data terminal and a channel to which data of the data terminal is allocated, wherein the data terminal and the channel to which data of the data terminal are allocated In the case of changing the correspondence relationship between the time division multiplex communication devices, the function information indicating the function of each data terminal is assigned to each channel and transmitted, and only the data terminals whose functions match based on the function information are transmitted. Select and reassign the channel to the data of the data terminal whose function matches, A data transmission device comprising frame configuration control means for updating frame information stored in respective storage means of the time division multiplex communication device corresponding to the above.