JP3574561B2 - Digital data distribution center equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to digital data distribution for simultaneously distributing digital data to a large number of client terminals. Center device In particular, in view of the high cost required to prepare a large number of center windows in the past, it has become possible to construct a digital data distribution system that has the same effect at a low cost.
[0002]
[Prior art]
In a conventional digital data distribution system, a digital line to which only one terminal can be connected simultaneously is prepared for the number of windows, and each client terminal accesses the window through a digital public network.
[0003]
[Problems to be solved by the invention]
In the configuration of the conventional digital data distribution system, a digital line and a digital data transmission device are arranged at all center windows, and if a large number of center windows are prepared, the construction cost of the digital data distribution system increases. There was a problem.
[0004]
In view of this problem, the present invention provides a digital data distribution system that can distribute data to a large number of client terminals using a one-way multi-connection digital line provided by a digital public network, even if only a small number of center windows are prepared. It is intended to provide.
[0005]
[Means for Solving the Problems]
In the present invention, a digital public network providing a multi-connection function is used, and a center device and a terminal device having a function of utilizing the function provided by the public network are used.
[0006]
The data distribution center device according to the present invention comprises: means for detecting the arrival of a multi-connection request; means for acquiring incoming information when an incoming call is received; From the number of connected calls and the connection start time of each call Means for storing the management information as management information; Number of connected calls for Means for deciding whether to allow multi-connection of an incoming call based on a call, means for multi-connection of an incoming call to a one-way multi-connection digital circuit, means for rejecting multi-connection of a call, and one-way multi-connection digital Means for sending digital data to a line, and the management information Connection start time Means for deciding whether to disconnect a specific call that is connected based on a message, means for disconnecting a specific call that is connected, and means for detecting that a specific call has been voluntarily disconnected from the terminal side The main feature is to have
[0007]
Also , De The digital data receiving terminal device includes a means for requesting a multi-connection to the center, a means for detecting permission or rejection of the multi-connection from the center, and a means for receiving digital data from the center through a one-way digital line. The main feature is that it has means for detecting an interruption from the center side, and means for spontaneously disconnecting the line from the terminal side.
[0008]
De The digital data distribution system includes the digital data distribution center device, the digital data receiving terminal device, and a digital public network having a function of performing multi-connection in a terminal exchange accommodating the center device.
[0009]
With this configuration, calls from multiple terminal devices are multi-connected in the central office that accommodates the center device, and even if only a small number of lines are prepared in the center device, several times the number of terminal devices can simultaneously transmit digital data. Will be able to receive the delivery service. Therefore, a digital data distribution system can be constructed at low cost. In particular, fine-grained operation management becomes possible, such as setting a limit on the connection duration using incoming information.
[0010]
Further, the digital data distribution center device is provided with a means for detecting disconnection of a specific call from the network, and the digital data receiving terminal device is notified to the network that the transmission is permitted to permit disconnection due to network-side circumstances. A means for notifying and a means for detecting disconnection from the network are provided, and as a digital public network, a function of performing multi-connection within the terminal exchange accommodating the center device, and a condition of the network side notified from the terminal device to the network. The one that has a function of recognizing permission to disconnect and a function of disconnecting a specific call depending on the circumstances of the network side is used.
[0011]
In this way, when the network side is congested, other customers can usually be given permission by the client terminal in advance to disconnect and open the line route that was being used for the use of the multi-connection service. To be able to preferentially use the telephone call service. This makes it possible to make effective use of the line resources prepared on the network side, so that the communication fee for digital data distribution can be made lower than usual. Therefore, it is possible to construct a digital data distribution system that can be used by terminals with a low communication fee.
[0012]
Another digital data distribution center apparatus according to the present invention includes a means for detecting an incoming call of a multi-connection request, a means for acquiring calling party information and incoming call information at the time of receiving a call, Means for deciding whether or not to permit multi-connection of a specific call based on management information, means for multi-connection of an incoming call to a one-way multi-connection digital circuit, and rejection of multi-connection for a call Means for transmitting digital data to a one-way multi-connection digital circuit, means for determining whether to disconnect a specific call under connection based on management information, and disconnecting a specific call during connection Means for detecting that a specific call has been spontaneously disconnected from the terminal side.
[0013]
The digital data receiving terminal device includes a means for requesting a multi-connection to the center, a means for notifying the center of calling side information, a means for detecting permission or rejection of the multi-connection from the center, , A means for receiving the digital data through the one-way digital line, a means for spontaneously disconnecting the line from the terminal side, and a means for detecting an intermediate disconnection from the center side.
[0014]
The digital data distribution center device, the digital data receiving terminal device, and a digital public network having a function of performing multi-connection in the terminal exchange accommodating the center device and a function of transmitting calling side information to the center device at the time of multi-connection. , Constitute a digital data distribution system.
[0015]
As a result, the information on the terminal side, for example, the telephone number of the calling side is notified to the center device, and the center can determine whether to permit the multi-connection based on the information. Therefore, for example, a digital data distribution system that can be used only by members registered in the center in advance can be constructed at low cost.
[0016]
Further, the digital data distribution center device is provided with a means for detecting disconnection of a specific call from the network, and the digital data receiving terminal device is notified to the network that the transmission is permitted to permit disconnection due to network-side circumstances. A means for notifying and a means for detecting disconnection from the network, a function of performing multi-connection in the terminal exchange accommodating the center device as a digital public network, a function of transmitting calling side information to the center device, a terminal device A function having a function of recognizing a disconnection permission based on network conditions notified from the network to the network and a function of disconnecting a specific call depending on network conditions are used.
[0017]
As a result, it becomes possible to reduce the communication fee by handling the non-priority call and to provide a service for a specific member.
Another digital data distribution center device according to the present invention comprises: means for detecting the arrival of a multi-connection request that changes from a non-connection state to a connection state; means for connecting an incoming call to a digital data transmission line; Means for sending digital data to the network, means for detecting the disconnection of the last call from the connected state to the disconnected state, and means for disconnecting all multi-connections. Means for stopping transmission of digital data when no multiple connections are made have.
[0018]
The digital data receiving terminal includes means for requesting the network for multi-connection to a designated center, means for receiving digital data through a one-way multi-connection digital line, and means for spontaneously disconnecting the line from the terminal. And means for detecting disconnection from the center side.
[0019]
A digital data distribution system is constituted by the digital data distribution center device, the digital data receiving terminal device, and a digital public network having a function of performing multi-connection in multiple stages in each exchange in the network.
[0020]
In this way, calls from a plurality of terminal devices are connected in multiple stages in the exchanges on each communication path. Although the center cannot acquire the calling side information and the incoming call information, it is possible to connect as many terminal devices as possible to a single line by the multi-connection by the multi-stage switch. Therefore, even if only one line is prepared in the digital data distribution center device, a digital data distribution system in which a very large number of terminal devices can be used simultaneously can be constructed at an extremely low cost. .
[0021]
This digital data distribution center device is further provided with means for detecting a disconnection made to the last call from the network, and the digital data receiving terminal device informs the network that the transmission is permitted to permit disconnection due to network-side circumstances. Means for notifying and means for detecting disconnection from the network are provided. In addition, as a digital public network, a function to perform multi-connection in multiple stages in each exchange in the network, a function to recognize disconnection permission due to circumstances to the network side notified from the terminal device to the network, and a specific call from the network side Use one that has the function of cutting.
[0022]
This makes it possible to construct a digital data distribution system at extremely low cost, and to reduce the communication fee by handling non-priority calls for digital data distribution.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a diagram for explaining a first embodiment of the present invention.
[0024]
The center device 10 includes a digital data transmission unit 11, a management information storage unit 12, a connection permission determination unit 13, an incoming call detection unit 14, an incoming information acquisition unit 15, a multi connection processing unit 16, a multi connection rejection unit. 17, a halfway disconnection determination unit 18, a specific call disconnection execution unit 19, and a specific call disconnection detection unit 110.
[0025]
The terminal device 20 includes a digital data reception unit 21, a multi-connection request unit 22, a line disconnection execution unit 23, a multi-connection permission detection unit 24, and a center-side disconnection detection unit 25.
[0026]
The digital public network 30 has a function of performing multi-connection within the terminal exchange 31 that accommodates the center device 10.
When receiving distribution of digital data, the multi-connection request unit 22 of the terminal device 20 requests the center device 10 for multi-connection through the D channel. When detecting that the multi-connection is permitted, the multi-connection permission detecting unit 24 instructs the digital data receiving unit 21 to start receiving digital data. Upon receiving the instruction to start reception, the digital data receiving unit 21 starts receiving digital data through the B channel. When the data to be received has been received, the reception is stopped, and the line disconnection execution unit 23 is instructed to voluntarily disconnect the multi-connection from the terminal side. When the multi-connection is spontaneously disconnected from the center, the center-side disconnection detecting unit 25 detects this and instructs the digital data receiving unit 21 to stop receiving.
[0027]
When detecting the multi-connection request from the terminal device 20, the incoming call detection unit 14 in the center device 10 notifies the incoming call information acquisition unit 15 of the detection. The incoming information acquiring unit 15 acquires the incoming time as incoming information and records it in the management information storage unit 12.
[0028]
FIG. 2 shows an example of the data structure of the management information storage unit 12. The management information storage unit 12 records information on the number of connected calls and records information on a set of each call number and a connection start time.
[0029]
The connection permission determining unit 13 grasps the number of currently multi-connected calls from the information in the management information storage unit 12, and permits the multi-connection if the number does not reach the upper limit of the multi-connection, and performs the multi-connection processing. An instruction is sent to the unit 16 to perform a multi-connection process. On the other hand, if the number of currently multi-connected calls has reached the upper limit of the multi-connection, an instruction is issued to the multi-connection rejection unit 17 to reject the multi-connection.
[0030]
The midway disconnection determination unit 18 detects a call that has been connected for longer than a predetermined time from the information in the management information storage unit 12 and instructs the specific call disconnection execution unit 19 to disconnect the call. In response to this instruction, the specific call disconnection execution unit 19 disconnects the specified specific call that is being connected.
[0031]
The specific call disconnection detection unit 110 detects when a specific call among the multi-connection calls is voluntarily disconnected from the terminal side, and updates the management information in the management information storage unit 12.
[0032]
The digital data transmission unit 11 grasps from the information in the management information storage unit 12 whether at least one terminal is connected, and repeatedly transmits digital data when one or more terminals are connected. . The digital data to be transmitted is divided into, for example, blocks of a specific size, and a serial number indicating the order of the block is assigned to each block and transmitted.
[0033]
Specifically, when the entire data is composed of, for example, three blocks, a serial number is assigned to each block as (1/3), (2/3), (3/3). The digital data receiving unit 21 of the terminal device 20 determines whether or not all data has been received based on the serial number. It is not always necessary to start reception from the first block, and reception may be performed in the middle, such as (2/3), (3/3), (1/3). The digital data receiving section 21 terminates the data reception when all the data have been collected.
[0034]
In this example, it is assumed that distribution of storage-type data is assumed, and the terminal device 20 spontaneously disconnects the multi-connection after receiving one set of data. This operation is not required when performing, so it is not mandatory.
[0035]
With the above configuration, data can be distributed to a large number of client terminals even if only a small number of windows are prepared in the center device 10.
In this embodiment, the means for judging the interruption is provided on the center side. However, depending on the conditions of the interruption, the means for judging whether or not the interruption may be provided on the terminal side. In this case, the same effect can be obtained. For example, the connection duration can be managed by the terminal and the terminal can disconnect the multiple connection when the connection duration exceeds a certain upper limit.
[0036]
[Second embodiment]
FIG. 3 is a diagram illustrating a second embodiment of the present invention.
In FIG. 3, the portions denoted by the same reference numerals as those in FIG. 1 have the same functions as those described in the first embodiment. In the second embodiment, the center device 10 further has a network-side situation specific call disconnection detection unit 111, and the terminal device 20 has a network-side situation disconnection permission unit 26 and a network-side situation disconnection detection unit 27. .
[0037]
The digital public network 30 has a function of performing a multi-connection in the terminal exchange 31 accommodated in the center device, a function of recognizing a disconnection permission based on a network-side condition notified to the network from the network-side condition disconnection permitting unit 26 of the terminal device 20 and It has the function of disconnecting a specific call depending on the situation on the network side. A digital public network having such a function is known, for example, from technical research materials of “INS Network Service User Network / Interface (1996 Version)” released to the public by the Telecommunications Industry Association of Nippon Telegraph and Telephone Corporation. ing. The function of disconnecting a specific call according to the circumstances of the network is when a call with a lower priority (called a non-priority call) in the network compared to a general call increases when the volume of traffic flowing through the network increases. In addition, it is a function to disconnect a general call to connect preferentially.
[0038]
The multi-connection request unit 22 of the terminal device 20 requests the center device 10 for multi-connection through the D channel. At this time, the network side situation disconnection permitting unit 26 notifies the network that the call may be forcibly disconnected due to the network side situation. When detecting that the multi-connection is permitted, the multi-connection permission detecting unit 24 instructs the digital data receiving unit 21 to start receiving digital data.
[0039]
Upon receiving the instruction to start reception, the digital data receiving unit 21 starts receiving digital data through the B channel. When the data to be received has been received, the reception is stopped, and the line disconnection execution unit 23 is instructed to voluntarily disconnect the multi-connection from the terminal side. When the multi-connection has been spontaneously disconnected from the center, the center-side disconnection detection unit 25 detects this and instructs the digital data reception unit 21 to stop receiving.
[0040]
Further, upon detecting the forced disconnection due to the network side situation, the network side situation disconnection detecting unit 27 instructs the digital data receiving unit 21 to stop the reception.
When detecting the multi-connection request from the terminal device 20, the incoming call detection unit 14 in the center device 10 notifies the incoming call information acquisition unit 15 of the detection. The incoming information acquiring unit 15 acquires the incoming time as incoming information and records it in the management information storage unit 12.
[0041]
The connection permission determining unit 13 grasps the number of currently multi-connected calls from the information in the management information storage unit 12, and permits the multi-connection if the number does not reach the upper limit of the multi-connection, and performs the multi-connection processing. An instruction is sent to the unit 16 to perform a multi-connection process. On the other hand, if the number of currently multi-connected calls has reached the upper limit of the multi-connection, an instruction is issued to the multi-connection rejection unit 17 to reject the multi-connection.
[0042]
The midway disconnection determination unit 18 detects a call that has been connected for a long time from the information in the management information storage unit 12, and instructs the specific call disconnection execution unit 19 to disconnect the call. In response to this instruction, the specific call disconnection execution unit 19 disconnects the specified specific call that is being connected. The specific call disconnection detecting unit 110 detects when a specific call among the multi-connected calls is voluntarily disconnected from the terminal side, and updates the management information in the management information storage unit 12.
[0043]
The network-side situation specific call disconnection detection unit 111 detects when a specific call among the multi-connected calls is forcibly disconnected due to the network-side situation, and detects the management information in the management information storage unit 12. To update.
[0044]
The digital data transmission unit 11 grasps from the information in the management information storage unit 12 whether at least one terminal is connected, and repeatedly transmits digital data when one or more terminals are connected. .
[0045]
[Third Embodiment]
FIG. 4 is a diagram illustrating a third embodiment of the present invention.
In FIG. 4, the portions denoted by the same reference numerals as those in FIG. 1 have the same functions as those described in the first embodiment. The third embodiment is different from the first embodiment in that the center apparatus 10 has a calling side information incoming information acquiring section 112 instead of the incoming call information acquiring section 15 and the terminal apparatus 20 has a calling side information notifying section 28. Is different from the embodiment of the present invention. The digital public network 30 has a function of performing multi-connection in the central office 31 accommodated in the center device and a function of transmitting calling side information to the center device 10 at the time of multi-connection.
[0046]
In the above-described first embodiment, the permission of the multi-connection and the interruption are determined based on the incoming information that can be known on the receiving side, such as the current number of multi-connections and the connection duration of each call. If the information of the calling side is notified from the center 20 to the center side, it is possible to make a more sophisticated judgment, which is effective. For example, by notifying the originating address to the center device 10 and giving the multi-connection permission only to the pre-registered address on the center side, a digital data distribution system of a membership system can be constructed.
[0047]
Therefore, in the third embodiment, when the multi-connection request unit 22 of the terminal device 20 requests the center device 10 for multi-connection through the D channel, the calling-side information notifying unit 28 transmits the calling-side address and the like. The center device 10 is notified.
[0048]
When the multi-connection request is detected by the incoming call detecting unit 14, the calling side information incoming information obtaining unit 112 of the center apparatus 10 obtains the calling side information and the incoming information such as the incoming time, and stores them in the management information storage unit 12. The connection permission deciding unit 13 checks from the information in the management information storage unit 12 whether the caller address is registered in advance, and if not, the multi-connection rejection unit rejects the multi-connection. Instruct 17. In the case where the calling address is registered in advance, determining whether to permit or reject multi-connection based on the number of currently multi-connected calls is the same as in the first embodiment described above. It is.
[0049]
Typical examples of the calling party information include a calling party address, a calling party phone number, and the like. In addition, it is also possible to use a membership system in which an individual's ID and password are input at the terminal device 20 and are notified to the center device 10 as calling side information.
[0050]
[Fourth Embodiment]
FIG. 5 is a diagram for explaining a fourth embodiment of the present invention.
In the fourth embodiment, a function for processing a non-priority call according to the second embodiment, and the terminal device 20 according to the third embodiment, which notifies the center device 10 of calling side information, This is a combination of a function that allows the center device 10 to determine whether to permit or reject the multiple connection based on the information.
[0051]
Each technical content is the same as in the above-described example, and a detailed description thereof will be omitted.
[Fifth Embodiment]
FIG. 6 is a diagram for explaining a fifth embodiment of the present invention.
[0052]
In the above-described embodiment, an example is described in which the digital public network 30 that performs multi-connection only in the terminal exchange 31 in which the center device 10 is accommodated, but as shown in FIG. The use of the digital public network 30, which is connected in multiple stages by the exchanges 32 to 38 on the path leading to the device 10, enables an extremely large-scale multi-connection, which is effective.
[0053]
In this multi-stage multi-connection mode, the center device 10 cannot generally detect addition or detachment of the multi-connection to or from the exchanges 32 to 38 on the intermediate route. However, it is possible to detect the arrival of the multi-connection request from the non-connection state to the connection state and the disconnection of the last call from the connection state to the non-connection state, which affect the terminal exchange 32 accommodated in the center apparatus 10. is there. Based on this information, transmission of digital data can be stopped when no multiple connection is made. In this way, it is possible to suppress the consumption of equipment due to useless operation, which is effective.
[0054]
The multiple connection request unit 22 of the terminal device 20 requests the network for multiple connection to the designated center. The digital data receiving unit 21 receives digital data through a one-way multi-connection digital line. The line disconnection execution unit 23 disconnects the line spontaneously from the terminal side. The center-side disconnection detection unit 25 detects disconnection from the center side.
[0055]
The head arrival detection unit 120 of the center device 10 detects the arrival of a multi-connection request that changes from a non-connection state to a connection state. The first call connection processing unit 121 connects an incoming call to a digital data transmission line. The digital data transmitting unit 11 transmits digital data to be distributed to a one-way multi-connection digital line. The final call disconnection detection unit 122 detects disconnection of the last call that changes from the connected state to the non-connected state. The all-multi-connection disconnection execution unit 123 disconnects all multi-connections.
[0056]
The digital public network 30 has a function of performing multiple connections in multiple stages in each of the exchanges 32-38 in the network.
[Sixth Embodiment]
FIG. 7 is a diagram for explaining a sixth embodiment of the present invention.
[0057]
In FIG. 7, the portions denoted by the same reference numerals as those in FIG. 6 have the same functions as those described in the fifth embodiment. In the sixth embodiment, the center apparatus 10 further has a network-side situation final call disconnection detection unit 124, and the terminal apparatus 20 has a network-side situation disconnection permission unit 26 and a network-side situation disconnection detection unit 27. .
[0058]
The network-side situation final call disconnection detection unit 124 of the center device 10 detects a disconnection made to the final call from the network. The network-side situation disconnection permitting unit 26 of the terminal device 20 notifies the network that the transmission is permitted to permit disconnection due to the network-side situation. The network-side situation disconnection detection unit 27 detects disconnection from the network.
[0059]
The digital public network 30 according to the sixth embodiment has a function of performing multi-connection in multiple stages in each of the exchanges 32 to 38 in the network, and disconnects the network side notified from the terminal device 20 to the network due to circumstances. It has the function of recognizing permission and the function of disconnecting a specific call from the network side.
[0060]
In the sixth embodiment, a function of effectively using the line resources by handling the non-priority call described in the second embodiment is added to the fifth embodiment described above. It becomes possible to construct a digital data distribution system that can be used by terminals at a low communication fee at extremely low cost.
[0061]
The operation at the time of multi-stage multi connection in the fifth and sixth embodiments will be described with reference to FIG.
For example, as shown in FIG. 8A, suppose that a request for multi-connection is received from the terminal device 20B while the terminal device 20A is being multi-connected to the center device 10. In response to this request, the terminal device 20B is multi-connected to the exchange 36 accommodating the terminal device 20B. Since the exchange 36 does not have a multi-connection path to the center device 10, it requests the next exchange 35 connected to the center device 10 for multi-connection. Thus, the exchange 36 is multi-connected to the exchange 35. Since the exchange 35 has a multi-connection path connected to the center device 10 via the exchange 32, the connection processing is completed there. Thus, as shown in FIG. 8B, a multi-connection path is formed between the terminal device 20B and the center device 10.
[0062]
Next, with reference to FIG. 9, an operation at the time of disconnection in the case of multi-stage multi-connection in the fifth and sixth embodiments will be described.
For example, when the multi-connection is disconnected from the terminal device 20A in the connection state as shown in FIG. 8B, as shown in FIG. 9A, the exchange 38 accommodating the terminal device 20A becomes the center device. It is checked whether or not a multi-connection from another terminal device multi-connected to 10 remains. Since there is no remaining multi-connection from the other terminal devices in the exchange 38, the multi-connection with the next exchange 35 connected to the center device 10 is disconnected. When detecting the disconnection of the multi-connection with the exchange 38, the exchange 35 checks similarly whether the multi-connection from another terminal device connected to the center device 10 remains. In this case, since the multi-connection from the other terminal device 20B remains in the exchange 35, the disconnection processing is completed there, and the connection state becomes as shown in FIG. 9B.
[0063]
【The invention's effect】
As described above, according to the present invention, even if only a small number of lines are prepared in the center, a digital data distribution system that can be used simultaneously by a large number of terminals can be constructed at low cost. In addition, detailed operation management can be performed, such as setting a limit on the connection duration time using incoming information.
[0064]
In addition, by notifying the information of the terminal to the center and deciding whether to permit or reject multi-connection, a digital data distribution system that can be used only by members registered in the center in advance can be constructed at low cost. It becomes possible to do.
[0065]
In some networks, when the network becomes congested, the network usage fee is set lower instead of forcing the client to disconnect the multi-connection from the network side in order to transfer network resources to other calls. Service menu may be prepared. By using such a network, it is also possible to construct a digital data distribution system in which terminals can be used at a low communication fee.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a first embodiment of the present invention.
FIG. 2 is a diagram illustrating an example of a data structure of a management information storage unit.
FIG. 3 is a diagram illustrating a second embodiment of the present invention.
FIG. 4 is a diagram illustrating a third embodiment of the present invention.
FIG. 5 is a diagram illustrating a fourth embodiment of the present invention.
FIG. 6 is a diagram illustrating a fifth embodiment of the present invention.
FIG. 7 is a diagram illustrating a sixth embodiment of the present invention.
FIG. 8 is an operation explanatory diagram at the time of multi-stage multi connection in the fifth and sixth embodiments of the present invention.
FIG. 9 is an explanatory diagram of an operation at the time of disconnection in the multistage multi-connection according to the fifth and sixth embodiments of the present invention.
[Explanation of symbols]
10 Center equipment
11 Digital data sending section
12 Management information storage
13 Connection permission determination unit
14 Incoming detector
15 Incoming call information acquisition unit
16 Multi connection processing unit
17 Multi-connection refusal part
18 Midway disconnection decision section
19 Specific call disconnection execution unit
110 Specific call disconnection detection unit
111 Network side situation specific call disconnection detector
112 Calling party information incoming information acquisition part
120 Top incoming call detector
121 Top call connection processing unit
122 Last call disconnection detector
123 All Multi Connection Disconnect Execution Unit
124 Network side final call disconnection detector
20 Terminal device
21 Digital data receiving section
22 Multi-connection request section
23 Line disconnection execution unit
24 Multi-connection permission detector
25 Center side disconnection detector
26 Network side disconnection permission section
27 Network side disconnection detector
30 Digital Public Network
31-38 exchange

Claims (4)

In a digital data distribution center device in a system for distributing digital data,
Means for detecting an incoming multi-connection request;
Means for acquiring incoming information when an incoming call is received;
Means for storing the number of connected calls and the connection start time of each call as management information from the acquired incoming call information;
Means for determining whether to permit multiple connections for an incoming call based on the number of connected calls in the management information;
Means for multi-connecting an incoming call to a one-way multi-connection digital circuit;
Means for rejecting multiple connections of a call;
Means for sending digital data to a one-way multi-connection digital circuit;
Means for determining whether or not to disconnect a specific call being connected based on the connection start time of the management information;
Means for disconnecting a particular connected call;
Means for detecting that a specific call has been spontaneously disconnected from the terminal side. 2. The digital data distribution center device according to claim 1, further comprising means for detecting disconnection of a specific call from a network. In a digital data distribution center device in a system for distributing digital data,
Means for detecting the arrival of a multi-connection request from a non-connection state to a connection state;
Means for connecting an incoming call to a digital data transmission line;
Means for sending digital data to a one-way multi-connection digital circuit;
Means for detecting the disconnection of the last call from the connected state to the disconnected state;
Means for disconnecting all multi-connections ,
Means for stopping transmission of digital data when no multi-connection is made at all . 4. The digital data distribution center apparatus according to claim 3, further comprising means for detecting disconnection of the last call from the network.

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