JPH0123985B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application of the Invention The present invention relates to a connection regulation method for multiple-connection subscribers, and in particular, in a digital exchange, where multiple calls are
This relates to a connection regulation method when connecting to a subscriber or one line by time division multiplexing.

Prior Art In digital time-division switching equipment, especially telephone switching equipment (hereinafter referred to as digital switching equipment), communication signals are digitally encoded and connected in a time-division manner, so that multiple calls can be sent to one line or one subscriber. can be connected at the same time. This connection form is called multiple connection, and multiple connection lines,
Each subscriber is called a multiple access line and a multiple access subscriber. In the case of multiple access, it is impossible to transmit communication signals from multiple connected calls to multiple connected lines and multiple connected subscribers because of crosstalk; It is possible to carry communication signals to the call. That is, when unidirectional communication from multiple access lines or multiple access subscribers is sufficient, communication signals can be transmitted to multiple calls at the same time by multiple access. For example, in a telephone exchange, busy tone can be communicated in one direction, so if multiple access lines are connected to the busy tone trunk, only one busy tone trunk needs to be installed in the exchange. On the other hand, the multiple connection subscriber can be applied to various telephone services such as boat race result information, stock price information, and travel information, which require one-way communication. Traditional analog switches required one telephone service subscriber line for each call, so if there were 10 telephone service subscriber lines, 10 calls would be connected, but any additional calls would be busy. , the number of busy calls increased and the processing efficiency of the exchange decreased.

On the other hand, if the subscribers are multiple-connected as described above, even if there is only one telephone service subscriber line, it is possible to connect as many calls as the blockage of the exchange channel network allows, and calls requesting telephone service can Even if the number of calls increases, the number of busy calls does not increase, and the efficiency of the exchange does not decrease in any way. However, calls requesting telephone service (incoming calls) from other exchanges connected to the previous stage are connected via the incoming line to that exchange, so if the number of telephone service calls increases, the incoming line to that exchange becomes A problem arises in that calls to other subscribers are held on hold, making it difficult for the upstream exchange to seize the line, and connection services for incoming calls to other subscribers deteriorate.

OBJECT OF THE INVENTION It is an object of the present invention to solve these problems, in order to solve these problems, when connecting to multiple access subscribers accommodated in a digital exchange through an incoming line, an increase in the number of multiple access subscriber calls monopolizes the incoming line. Therefore, it is an object of the present invention to provide a connection regulation method for multiple access subscribers that can take advantage of multiple access without putting pressure on other incoming calls.

Summary of the Invention The connection regulation method for multiple access subscribers according to the present invention monitors the number of simultaneous connections regarding incoming calls of multiple access subscribers and the number of simultaneously used incoming lines in a digital time division exchange that accommodates multiple access subscribers. and when the number of simultaneous connections is at least a predetermined first threshold and the number of simultaneously used lines is at least a second predetermined threshold, restricting connections to the multiple access subscriber with respect to incoming calls. It has the following characteristics.

Embodiment of the Invention FIG. 1 is a schematic configuration diagram of a digital exchange showing an embodiment of the present invention.

1 is a multiple access subscriber, 2 and 3 are general subscribers, 4
5 is a communication path device, 5 is a central processing unit, 6 is a congestion detection device, 7 is an incoming line, and 11 to 17 are each channel of line 7. For the sake of explanation, since lines in digital exchanges are generally time division multiplexed lines, each line will be referred to as a channel (line). Calls that arrive via incoming line 7 (incoming calls) are channel 1.
1 to 17 are captured and the call arrives. An incoming call to general subscribers 2 and 3 will be processed as busy if the call is already connected to subscribers 2 and 3, but an incoming call to multiple access subscriber 1 will be processed as busy if the call is already connected to multiple access subscriber 1. Even if the call is connected, the congestion detection device 6 determines the congestion situation, and if there is no congestion, the call is connected to the multiple access subscriber.

For example, if the multiple connection subscriber 1 is a boat race results guide, when there is a rush of people who want to know the boat race results, all channels 11 to 17 of the incoming line 7 will be occupied by them, and the general subscribers 2, 3 Even if there is an incoming call, it will be treated as busy in the digital exchange at the front stage, and a state of congestion will occur due to the boat race result information.
In order to prevent this, in the present invention, if the incoming call of a multiple connection subscriber occupies a predetermined number of channels among all the channels of the incoming line, the incoming call of a multiple connection subscriber beyond that number is connected. Regulation, that is, busy processing is performed. To this end, the number of simultaneous incoming channels used and the number of simultaneous connections of multiple-connection subscribers are monitored in parallel, and when both exceed preset values, the congestion status of incoming calls of multiple-connection subscribers is monitored. It is determined that Even if only one of the channels exceeds the set value, if there are many empty channels on the incoming line due to a large number of incoming subscriber calls due to intra-office connections, or if most of the channels on the incoming line are in use at the same time. However, most of the calls are blocked by incoming calls to general subscribers 2 and 3, and in such cases it is judged that there is no need to restrict connections for incoming calls from multiple-connected subscribers. are doing.

FIG. 2 is a configuration diagram of the congestion detection device in FIG. 1.

21 is a counter that counts the number of calls connected to the multiplex connection subscriber 1; 22 is a counter that counts the number of used channels (lines) of the input line 7; 23, 24;
are registers that store threshold values, 25 and 26 are comparison circuits, 27 is an AND circuit, 31, 32, 33,
34, 35, 36 are control lines, 37, 38 are the outputs of the comparison circuits 25, 26, and 39 is the AND circuit 2.
This is the output of 7.

The threshold value set in register 23 is the threshold value for the number of simultaneous connections to multiple access subscribers;
The threshold set to 4 is the threshold for the number of concurrently used channels on the incoming line. In principle, the maximum number of simultaneous connections to the multiplex connection subscriber 1 is the same as the total number of input terminals on the secondary side of the channel device 4, but the register 23 has a value of 10% of the maximum number, as an example. Set.
Further, in the register 24, for example, a value of 80% of the total number of channels is set as the number of inputs.

When there is an incoming call to the multiple access subscriber 1, the central processing unit 5 checks the output 39, and the output 39 is a logic "0".
If , the call is connected to the multi-access subscriber 1; if logic "1", the multi-access subscriber 1 is busy and the call is given busy treatment. When connected to multiple access subscriber 1, an addition pulse is applied to control line 31, and counter 21 increments by one. When the incoming call connected to the multiple access subscriber 1 is terminated, the central processing unit 5 sends a subtraction pulse to the control line 32, and the counter 21 decrements by one. Therefore, the number of incoming calls connected to the multiple access subscriber 1 is stored in the counter 21. Similarly, incoming line 7
When a channel is used, an addition pulse is applied to the control line 33, and when it is released, a subtraction pulse is applied to the control line 34, and the counter 22 stores the number of simultaneously used channels (lines) of the input line 7. In the register 23, a threshold value for the number of simultaneous connections regarding incoming calls of the multiple access subscriber 1 is preset, and in the register 24, a threshold value for the number of simultaneously used channels of the incoming line 7 is preset via control lines 35 and 36. The contents of the counter 21 and the contents of the register 23 are compared in the comparator circuit 25, and when the contents of the counter 21 and the contents of the register 23 are the same, the output 37
becomes a logic "1", otherwise it becomes a logic "0".
Similarly, the contents of the counter 22 and the contents of the register 24 are compared in the comparator circuit 26, and when the contents of the counter 22 are the contents of the register 24, the output 38 of the comparator circuit 26 is logic "1", otherwise it is logic "0". become. The outputs 37 and 38 are ANDed by an AND circuit 27. Therefore, the output 39 is logic 1 when the number of simultaneous connections for incoming calls of the multiplexed subscriber 1 is greater than or equal to the threshold, and the number of simultaneously used channels of the incoming line 7 is greater than or equal to the threshold; The connection to is restricted (busy processing), and it is possible to prevent the incoming line 7 from being occupied. Even if the number of simultaneously used channels of the incoming line 7 exceeds the threshold for other reasons, if the number of simultaneous connections regarding incoming calls of the multiple access subscriber 1 is less than the threshold, the connection will be allowed, so the connection to the multiple access subscriber 1 will be continued. is guaranteed, and even if the number of simultaneous connections for incoming calls of the multiplexed subscriber 1 exceeds the threshold, connection to the multiplexed subscriber 1 is allowed as long as the number of simultaneously used channels of the incoming line 7 is less than the threshold. The features of multiple connections can also be utilized. Note that with regard to calls within the own office (calls from the own exchange), connections to the multiple access subscriber 1 do not need to be subject to regulation because they have little influence on others.

In the above description, the case is that there is one multiple access subscriber, but in the case of multiple multiple access subscribers, a counter corresponding to the counter 21 and register 23 (which may be common to each multiple access subscriber), It is sufficient to provide registers, and if there are a large number of registers, it is economical to use a well-known technique of configuring counters and registers with memories. Furthermore, although the case where there is one incoming line has been described as an example, even if there are a plurality of incoming lines to be noted, the counter 22 may count them all at once. Furthermore, although the above description has been made using a telephone exchange as an example, the present invention is applicable not only to telephone exchanges but also to data exchanges, facsimile exchanges, and the like.

Note that multiple connection subscribers will not be busy, so
A traffic control system (for example, a traffic control system that measures the number of busy calls, determines a subscriber with a large number of busy calls as a congested subscriber, and instructs other exchanges to restrict calls to that subscriber) 53-015769), the congestion of multiple access subscribers cannot be detected, but if the present invention is applied, the traffic control system can also detect the congestion of multiple access subscribers.

Effects of the Invention As explained above, according to the present invention, when the number of simultaneous connections of the multiple access subscriber is equal to or greater than the threshold value and the number of simultaneously used channels of the incoming line is equal to or greater than the threshold value, connection to the multiple access subscriber is stopped. This prevents the incoming line from being monopolized by an increase in multiple access subscriber calls.
Therefore, it is possible to prevent other incoming calls from being overwhelmed, and in other cases, since the connection is made to a multiple access subscriber, it is possible to take advantage of the features of multiple access.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a digital exchange showing an embodiment of the present invention, and FIG. 2 is a block diagram of a congestion detection device in FIG. 1. 1: Multiple connection subscriber, 2, 3: General subscriber,
4: Communication path device, 5: Central processing unit, 6: Congestion detection device, 7: Incoming line, 11, 12, 13, 14,
15, 16, 17: Channel, 21, 22: Counter, 23, 24: Register, 25, 26: Comparison circuit, 27: AND circuit, 31, 32, 33, 3
4, 35, 36: Control line, 37, 38, 39: Output.

Claims (1)

[Claims] 1. In a digital time division exchange that accommodates incoming lines from other exchanges and multiple access subscribers, means is provided to monitor the number of simultaneous connections and the number of simultaneously used incoming lines for incoming calls of the multiple access subscribers, and When the number of connections is at least a predetermined first threshold, and the number of simultaneously used lines of the input line is at least a predetermined second threshold, restricting connections to the multiple access subscriber with respect to incoming calls. A connection regulation method for multiple access subscribers featuring features.