JPS63244946A - Time-division multiplexing transmission system - Google Patents

Abstract

PURPOSE:To effectively use a channel by a general terminal and a fast terminal, by re-allocating the channel released according to the request of the completion of data transmission from the fast terminal to the general terminal at every release. CONSTITUTION:When the requests to start the data transmission from the fast terminals 3A-3M are issued, a transmission control part 8 generates terminal allocation information to enable the data transmission from the fast terminals 3A-3M to be performed, and sets it on a transmission table and a reception table on a side being not in current use, and after that, transmission control is performed by switching the side to the one in current use. And at every issuing of the request of the completion of the data transmission from the fast terminals 3A-3M, the channels allocated to the fast terminals 3A-3M until then are eliminated, and the shares of general terminal addresses equivalent to eliminated shares are inserted.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a time division multiplex transmission system that transmits data by time division multiplexing, and particularly to terminals that use a single channel or a small number of channels. This invention relates to improvements for increasing the efficiency of data transmission when terminals that use multiple channels coexist.

(Prior Art) FIG. 5 shows an example of a conventional time division multiplex transmission system, in which one-to-one correspondence between time division multiplexers 1 is connected through a high-speed port 122, and each It is constructed by accommodating a plurality of terminals 3a to 3m in a time division multiplexer 1 (the other party's time division multiplexer 1 is not shown).

The time division multiplexing device 1 also includes interface circuits 4a to 4m provided corresponding to the respective terminals 3a to 3m, and a transmission section 6 connected to the interface circuits 4a to 4m via an internal data bussler. The transmission section 6 further includes a multiplexing section 60, a transmission table 61, and a reception table 62.

In the transmission section 6, the multiplexing section 60 has n
In accordance with the format of a transmission frame for high-speed circuits consisting of channels, time-division multiplexing processing of transmitted information and channel decomposition processing of received information, as will be described later, are performed.

Here, the transmission table 61 and the reception table 62 each have information that can be used for each channel as shown in FIG. Information on so-called terminal allocation, which is the allocation of terminal addresses, is stored.

Next, the operation of this time division multiplex transmission system will be briefly explained.

First, the transmission information output from the terminals 3a to 3m is taken into the multiplexing unit 60 via the corresponding interface circuits 4a to 4m and the data bus 5, and then sent to the transmission table 61.
The terminal assignments stored in are assigned to corresponding channels on the high-speed line transmission frame according to the information, subjected to so-called time division multiplexing processing, and then sent to the high-speed line 2.

On the other hand, in the reception operation, the incoming call information received from the high-speed line 3 is taken into the multiplexing unit 60 in the form of a high-speed line transmission frame, and the terminal allocation stored in the reception table 62 is assigned for each channel according to the information. After being disassembled, the signals are transmitted to the corresponding terminals 38-3m through the internal data bus 5 and interface circuits 4a-4m, respectively.

By the way, in this type of time division multiplexing system, when transmitting data with a large amount of information, such as image information, the transmission speed is increased by allocating a large number of channels on a high-speed line transmission frame.

At this time, terminal assignment information is stored in the transmission table 61 and reception table 62 in the transmission unit 6, in which the same address of the terminal is written for a large number of channels used up to one terminal. The terminal allocation is processed by the multiplexer 60 based on the information.

For example, in the example of FIG. 7, the address of terminal 3b is written in both channels 0 and 1, indicating that terminal 3b is a terminal that performs transmission using two channels.

In this way, when terminals that use a single channel or a small number of channels (for convenience, referred to as general terminals) and terminals that use multiple channels (also referred to as high-speed terminals) coexist, high-speed The exclusive rate of channels on line transmission frames increases, and the number of channels that can be used by general terminals is accordingly limited.

Therefore, in the conventional time division multiplex transmission system, it is not possible to effectively utilize channels between general terminals and high-speed terminals, and the efficiency of data transmission is low. This has the problem that efficient data transmission cannot be performed because effective channel use is inhibited in data transmission when general terminals and high-speed terminals coexist.

The present invention has been made in view of the above-mentioned circumstances, and provides a time division multiplexing transmission system that can effectively utilize channels even when general terminals and high-speed terminals coexist and can contribute to improving the efficiency of data transmission. The purpose is to provide

[Structure of the invention]

(Means for Solving the Problems) The time division multiplex transmission system of the present invention provides information on new terminal allocation corresponding to the request every time there is a data transmission start request or data transmission end request from a high-speed terminal. The terminal layout to be created includes an information creation means, and the terminal layout information setting means is configured to set information in the transmission table and the reception table in the terminal layout created by the information creation means. In response to a request to start data transmission from a high-speed terminal, a channel is assigned with priority to the general terminal, and a channel released in response to a request to end data transmission from the high-speed terminal is reallocated to the general terminal each time. Such terminal allocation is characterized in that data transmission is performed when the general terminals and the high-speed terminals coexist while performing information organization processing.

(Function) The time division multiplex transmission system of the present invention focuses on the low frequency of data transmission requests from high-speed terminals, and gives priority to the channel over general terminals while there is a data transmission start request from the high-speed terminal. The above purpose is achieved by allocating and transmitting data, and also reallocating channels that are released due to data transmission termination requests from the high-speed terminals to general terminals each time, and restarting data transmission by the general terminals. has been achieved.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

FIG. There is.

In FIG. 1, time division multiplexers 1 are connected to each other through high-speed lines 2, and each time division multiplexer 1 (the other time division multiplexer 1 is not shown).
Terminals 3a to 3m and terminals 3A to 3M are housed in the terminal.

Here, the terminals 3a to 3m correspond to the aforementioned general terminals, and the terminals 38 to 3M similarly correspond to high-speed terminals.

In addition, each of the above-mentioned terminals 3a to 3a is provided in the time division multiplexer 1.
Interface circuits 4a to 4m and 4A to 4M respectively corresponding to 3m and 3A to 3M are provided, and are connected to the transmission section 7 through an internal data bus 5.

In addition, as other components, the time division multiplexing device 1 is equipped with a transmission control section 8, a central control section 9, and the above-mentioned transmission section 7, interface circuits 4a to 4m, and 4A.
-4M are internal control buses 48.87A, 87B, 8
9.

Next, FIG. 2 is a block diagram showing the detailed configuration of the transmission section 7 in FIG. 1.

In FIG. 2, the transmission section 7 includes a multiplexing section 7o, a transmission processing section 7
1. It is equipped with a reception processing section 72, and an input/output section 73.7.
It is connected to the transmission control unit 8 via 4.75.76.

Among these, the transmission processing section 71 includes a switching signal generation section 710,
There are changeover switch sections 711 and 712, and two transmission tables 713 and 714 are provided between the changeover switch sections 711 and 712.

Similarly, the reception processing section 72 includes a switching signal generation section 720, changeover switches 721 and 722, and two reception tables 72 are provided between the changeover switch sections 721 and 722.
3 and 724 are provided.

In the transmission processing unit 71, transmission tables 713 and 71
4 refers to changeover switch units 711 and 712 that respond to the changeover signal (STS) generated from the changeover signal generation unit 710.
By switching control, either one can be selectively connected to the multiplexing section 70 or the transmission control section 8.

Also, in the reception processing unit 72, the reception table 723
and 724 are selectively sent to the multiplexing section 70 or the transmission control section 8 by switching control of the changeover switch sections 721 and 722 according to the switching signal (SRS) generated from the switching signal generating section 720. can be connected.

At the beginning of operation in this time division multiplex transmission system,
In the multiplexing unit 70, a connection state between one of the transmission and reception tables set in advance, for example, 713 and 723 (transmission and reception tables 714 and 724 are connected to the transmission control unit 8) is established.

At this time, the transmission table 713 and the reception table 7
23, information about the terminal allocation indicating the initial state is set in advance by the transmission control unit 8, and the multiplexing unit 70 determines the terminal allocation at the time of transmission and reception regarding data transmission of the terminals 3a to 3m based on the information. time-division multiplexing and time-division channel decomposition processing.

While data transmission is being performed by the terminals 3a to 3m, when a data transmission start request is received from the high speed terminals 3A to 3M, the transmission control unit 8
For a new terminal assignment that also enables data transmission from 3M, information is created and set in the transmission table 714 and reception table 724 on the side that is not currently being used.

Thereafter, at a predetermined timing, the connection between the transmission/reception table and the multiplexing unit 70 is changed from the current side (transmission table 713 and reception table 723) to the new side (transmission table 723).
14 and reception table 724), and the new terminal allocation set in the transmission table 714 and reception table 724 on the new side is processed by the multiplexer 70 based on the information.

The switching control of the transmission/reception table is performed by high-speed terminals 38 to 3M.
A new terminal assignment is made each time there is a request for data transmission from the high-speed terminal 3.
Efficient data transmission including A to 3M can be made possible. Figure 3 shows an example of terminal assignment information that is created at a certain timing during the series of processes described above, and the classification character areas indicated by arrows clearly distinguish between general terminal addresses and high-speed terminal addresses. has been made into

In the present invention, the terminal allocation information set in the transmission table 713 and the reception table 723 at the beginning of the system operation described above is in the form (
In FIG. 3, the address of terminal 3a is channel 0 (C
HO).

Then, each time there is a request to start data transmission from the high-speed terminals 3A to 3M, the classification character is slid downward, and the addresses of the high-speed terminals that have received the request are added in order from, for example, channel 0 (CHO) on the classification character, A creation process is performed in which the general terminal address is deleted from the rear end (n channel) accordingly.

At the same time, each time there is a data transmission termination request from a high-speed terminal 3A to 3M, the corresponding high-speed terminal address is deleted from the channel previously used by the high-speed terminal 3A to 3M, and the general terminal address is replaced accordingly. Creation processing such as insertion is also performed.

Such terminal allocation is performed by controlling the selection and switching of the transmission/reception table together with the information creation process, and the timing chart in FIG. This will be explained in detail with reference.

It should be noted that only the processing operations will be described here on the premise that data transmission is generally performed by the general terminals 3a to 3m based on the terminal allocation information in the initial state described above.

In this state, the request (TREQ) signal [Figure 4 (1)
For example, when a transmission start request is received from the high-speed terminal 3A (inputted to the transmission control unit 8 through the interface circuit 4A and internal control bus 48), the transmission control unit 8 assigns the address of the high-speed terminal 3A to the channel in use. The new terminal allocation created by this process creates information (new ASG) [Figure 4 (2)].

Next, the transmission control unit 8 transmits this new terminal assignment information (new AS
G) is input to the central control unit 9 through the internal control bus (FRM) 89, and further transmitted to the time division multiplexing device 1 on the other side via the inter-control unit communication path 99 [FIG. 4 (3)].

The new terminal assignment information (new ASG) created by the transmission control unit 8 is then transferred from the internal control bus 87B to the input/output unit 74 and the changeover switch unit 722, respectively, to the terminals not currently used, for example, for transmission. table 71
4 and is set in the reception table 724 [Fig.
4)].

The setting of the new terminal allocation information (new ASG) is performed in the same way in the time division multiplexing device 1 on the other side.

Subsequently, the transmission control section 8 receives the switching signal generation section 71 from the internal control bus 87A through the input/output sections 73 and 75, respectively.
A switching request signal (EXG) is sent to ports 0 and 720 [FIG. 4 (5)].

Of those to which the switching request signal (EXG) is given in this way, the switching signal generating section 710 generates the switching request signal (EXG).
XG), the transmission processing section 71 and the multiplexing section 70
The switching signal (STS
) is generated [Figure 4 (8)].

Changeover switch section 71 based on this changeover signal (STS)
1, the connection to the multiplexing unit 70 is switched from the current transmission table 713 to the transmission table 714, and from now on, the new terminal allocation set based on the transmission table 714 is based on the information (new ASG). Time division multiplexing processing is performed on the channel after the flag Fl on the transmission frame [FIG. 4 (10)].

By the way, in the switching control by the switching signal generating section 710 described above, the flag F1, which is the source of generating the switching signal (STS), sends a switching request to the other party's time division multiplexing device 1 (not shown) at the same time as the flag F1 is detected. It is transmitted as a flag for use.

Then, in the other party's time/minute side strip m converting device 1, [Fig. 4 (1)
Data (high-speed circuit transmission frame) transmitted from the destination time division multiplexing device 1 through the processing shown in 0))
The reception process is performed while paying attention to the switching request flag that arrives before that time.

Now, assuming that the time division multiplexing device 1 shown in FIG. Received frames processed with the multiplexing unit 70 [Fig. 4 (7)
] At the detection timing of the upper flag F1, the switching signal (SR3
), the connection to the multiplexer 70 is switched from the current receiving table 723 to the receiving table 724, and from now on, the new terminal assignment set in the receiving table 724 is based on the information ( New A
SG), time-division channel decomposition processing is performed on the channel after the flag Fl on the received frame [FIG. 4 (11)].

After that, when there is a new transmission start request from the high-speed terminals 3B to 3M, the same procedure as described above (Fig. 4 (1) to (11)
)), the high-speed terminals 3B to 3B that received the above transmission start request are added to the transmission/reception table on the side that is not currently in use.
The multiplexing unit 70 performs time division multiplexing processing and time division channel decomposition processing based on new terminal allocation information (new ASG) added by associating 3M addresses with used channels.

In addition, when there is a transmission termination request from the high-speed terminals 3A to 3M due to the termination of the data transmission that was being performed by such processing, the high-speed terminal 3A that received the transmission termination request is added to the transmission/reception table of the side that is not currently in use. The new terminal allocation is the same as described above in the multiplexing unit 70 based on the information (new ASG), in which the 3M address is deleted from the previously used channels and the general terminal transmission channels are added for the deleted channels. Process.

The process at the end of data transmission is to transmit a request (TREQ) signal [FIG. 4 (1)] from the high-speed terminals 3A to 3M where data transmission has been completed to the transmission control unit 8, from the beginning of the transmission to the end of the transmission. By simply changing the request to a request, the subsequent steps can be carried out in exactly the same manner as when the transmission control section 8 starts the transmission described above (FIG. 4 (2) to (11)).

At this time, a command is issued to the high-speed terminals 38 to 3M, which are newly added to the transmission/reception table and have become ready for transmission, to be given permission to send and receive data, giving priority to the general terminals 3a to 3m. to perform high-speed data transmission.

On the other hand, as mentioned above, high-speed terminal 3A is permitted to transmit data.
- General terminals 3a to 3m that became unable to transmit due to overflow from the limited number of channel areas on the transmission/reception table (see Figure 3) due to the addition of 3M addresses,
Until a TA order prohibiting data transmission and reception is issued and the data transmission of the high-speed terminals 3A to 3M is completed, there is room to add the addresses of the general terminals 3a to 3m to the transmission and reception table. The data transmission is put on hold.

In the time division multiplex transmission system of the present invention, from the transmission unit 7 to the internal data bus 5 and the interface circuits 4a to 4m and 4 to the corresponding terminals 3a to 3 through 4M, respectively.
By transmitting a command signal (TACT) to m and 3A to 3M, a command regarding permission and prohibition of data transmission as described above is issued [Fig. 4 (12)), and each time the command signal is By reorganizing the high-speed line transmission frames, it is possible to use channels efficiently when high-speed terminals 3A to 3M coexist.

〔Effect of the invention〕

As explained above, according to the time division multiplex transmission system of the present invention, each time there is a request to start or end data transmission from a high-speed terminal, new terminal allocation information is organized,
Since data transmission is performed in such a way that requests to start data transmission from high-speed terminals are accepted with the highest priority, it is possible to use channels effectively when general terminals and high-speed terminals coexist, and extremely efficient data transmission is possible. It has the excellent advantage of being achievable.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the time division multiplex transmission system according to the present invention, FIG. 2 is a block diagram showing the main part configuration of the time division multiplex transmission system shown in FIG. 1, and FIG.
The figure shows an example of terminal allocation information used in the time division multiplex transmission system of the present invention, and FIG. 4 shows the timing of each part signal for explaining the processing operation of the time division multiplex transmission system of the present invention. 5 is a block diagram showing the configuration of a conventional time division multiplex transmission system, and FIG. 6 is a diagram showing the general configuration of a high-speed line transmission frame used in this type of time division multiplex transmission system. FIG. 7 is a diagram showing an example of terminal allocation information used in a conventional time division multiplex transmission system. l...Time division multiplexing device, 2...High speed line, 3a~
3m... General terminal, 3 to 3M... High speed terminal, 4a
~4n, 4A~4N...interface circuit, 5.
... Internal data bus, 7... Transmission section, 70... Multiplexing section, 71... Transmission processing section, 72... Reception processing section,
73 to 76... Input/output section, 710.720... Switching signal generation section, 711.712, 721, 722... Changeover switch section, 713,723... Transmission table,
714° 724...Reception table, 8...Transmission control unit, 9...Central control unit, 48.87A, 87B, 8
9... Internal control bus, 99... Communication path between central control units. 1-d) Banquet 1j and Ir layer 1n "Figure 5

Claims (3)

[Claims] (1) Information sent from multiple terminals is allocated to each channel of the transmission frame according to the terminal allocation information set in the transmission table, and transmitted as time-division multiplexed information to the high-speed line, and received from the high-speed line. A general terminal using a single channel or a small number of channels, and a high-speed terminal using a large number of channels, disassemble the time division multiplexed information into each channel according to the terminal allocation information set in the reception table and transmit it to each corresponding terminal as reception information. In a time division multiplex transmission system in which terminals coexist, terminal allocation information creation means creates new terminal allocation information corresponding to the request each time there is a request to start data transmission or a request to end data transmission from the high-speed terminal; , terminal allocation information setting means for setting the terminal allocation information created by the terminal allocation information creation means in the transmission table and the reception table; and the general terminal in response to a data transmission start request from the high-speed terminal. While performing terminal allocation information organization processing such as allocating channels with priority to the general terminal, and re-allocating channels released due to data transmission termination requests from the high-speed terminal to the general terminal each time, A time division multiplex transmission system, characterized in that data transmission is performed when the high-speed terminals are present together. (2) selectively transmitting two transmitting tables and two receiving tables, and one of the transmitting tables and the receiving table to a multiplexing unit that performs the allocation process and the disassembly process; means for connecting to the terminal allocation information newly created by the terminal allocation information creating means, and transmitting the terminal allocation information newly created by the terminal allocation information setting means to the transmission table on the side not currently used and the The time division multiplex transmission according to claim 1, wherein the terminal allocation information organization process is performed by switching and connecting to the multiplexing section after setting the information in the reception table. system. (3) Time division multiplexing according to claim (2), characterized in that the switching connection is performed at the detection timing of a designated flag on the transmission frame processed by the multiplexing unit. transmission system.