JPH02141157A - Congestion controller - Google Patents

Abstract

PURPOSE:To prevent the increase in the load to be processed by an exchange attended with the increase in the connection request of a line by providing a switching means connecting the line and the exchange in response to the traffic of the exchange to a congestion controller provided separately with the exchange. CONSTITUTION:A switching control section 81 detects a traffic in a private branch of exchange 200 obtained via a serial bus 6. When the traffic in the private branch of exchange 200 is much and a line connection request comes via, e.g., a subscriber line 5a, the switching control section 81 connects the line 5a to an announcement section 10 via a switch 7a. The announcement section 10 uses a busy tone or talkie so as to output a message representing the disabled connection of the line 5a to the private branch of exchange 200. Thus, the subscriber line 5a is not connected to the private branch of exchange 200 but interrupted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention generally relates to a congestion control device for an exchange, and in particular to a congestion control device that can prevent an exchange from becoming congested due to an increase in line usage requests. Regarding equipment.

[Prior Art] FIG. 4 is a block diagram showing the configuration of a conventional private branch exchange. Referring to FIG. 4, this exchange has subscriber line 5.
A to 5z are directly connected to the exchange switch unit 2, a sender/receiver unit 4 is connected to the subscriber lines 5a to 5z via the exchange switch unit 2, and the exchange switch unit 2
and a call processing control section 3 connected to the sender/receiver section 4.

Generally, the sender/receiver unit 4 is provided with a circuit that processes dial signals for a much smaller number of lines than the number of subscriber lines 5.

This is done in consideration of the amount of traffic when processing dial signals, since the sender/receiver unit 4 used to be expensive.

In operation, dialing signals are provided to this exchange via the subscriber line 5a consisting of, for example.

The exchange switch section 2 connects the line 5a to a vacant circuit of the sender/receiver section 4. The sender/receiver section 4 receives the dial signal and provides the signal to the call processing control section 3. The call processing control section 3 performs switching control in the exchange switch section 2 based on the dial signal, and connects the subscriber line 5a to another line to be connected.

[Problems to be Solved by the Invention] The conventional exchange is configured as described above, and the number of lines that the sender/receiver section 4 can process is very small compared to the number of subscriber lines 5a to 5z. Therefore, when the number of calls is extremely large, the idle waiting time for using the sender/receiver section 4 and the time for connection processing between the line 5 and the sender/receiver section 4 by the exchange switch section 2 increase significantly. The exchanger is in the width section state.

However, since private branch exchanges are intended for use within premises, they do not have congestion/traffic control functions, and a method has been adopted in which incoming lines are unconditionally connected to a busy tone. This method requires the exchange to detect incoming calls from subscriber lines 5a to 5z, connect them to a busy tone, and disconnect the lines. Recently, since telephones have a redial function, it is possible to connect 5 subscriber lines.
Since repeated transmissions from a to 5z often continue, it is easy to get into a wide range state, and since the load to be handled by the exchange does not decrease, it is very difficult to eliminate the wide range state.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a width section control device that can prevent an exchange from entering a width section state due to an increase in line usage requests. .

[Means for Solving the Problem] The congestion control device according to the invention of claim (1) includes a switching means connected between a plurality of lines and an exchange, and a switching means connected to the exchange for each of the plurality of lines, and a switching means in the exchange. and a traffic detection means for detecting a traffic amount, and the switching means performs a connection operation in response to the traffic detection means.

The width portion control device according to the invention of claim (2) further includes connection regulating means for regulating the connection operation by the switching means in response to a connection destination signal given through the line and specifying the connection destination of the line. include.

[Function] In the width section control device according to the invention of claim (1), in the width section control device provided separately from the exchange, the switching means performs the connection operation based on the traffic amount in the exchange, so that the exchange itself performs the processing. It is possible to reduce the load to be carried out.

In the width portion control device according to the invention of claim (2), since the connection regulating means regulates the connection operation by the switching means based on the line connection destination, in response to a line connection request,
Line connection operations are performed at a reasonable frequency.

[Embodiment of the Invention] FIG. 1 is a block diagram showing the configuration of a width portion control device showing an embodiment of the invention. Referring to FIG. 1, private branch exchange 200 is connected to subscriber lines 5a to 5z via width section control device 100. Referring to FIG.

The width section control device 100 is connected to an exchange switch section 7 that connects each subscriber line 5a to 5z to the private branch exchange 200, and between each subscriber line 5a to 5z and the exchange switch section 7. Sender/receiver section 1a
to 1z, the width section control device 100 and the private branch exchange 200
The sender/receiver units 9a to 9z connected to each line for connecting the
The call processing control section 8 includes a call processing control section 8 that performs connection control in the exchange switch section 7 based on dial signals from the exchange switch section 7 through lz, and an announcement section 10 connected to the exchange switch section 7.

A multi-drop serial bus 6 connects each sender/receiver section 1a to 1z and 9a to 9z and the call processing control section 8.

The call processing control unit 8 connects the sender/
It includes a switching control section 81 connected to the receiver sections 1a to 1z and 9a to 9z for controlling switching of the exchange switch section 7, and a connection regulating section 82 for regulating switching control by the switching control section 81.

In operation, the switching control unit 81 detects the amount of traffic in the private branch exchange 200 obtained via the serial bus 6. When the amount of traffic in the private branch exchange 200 is large, for example, when there is a line connection request via the subscriber line 5a, the switching control unit 81 switches the line 5a to the switch 7.
It is connected to the announcement section 10 via a. The announcement section 10 outputs a message to the effect that the line 5a cannot be connected to the private branch exchange 200 using a busy tone or a talkie. As a result, the subscriber line 5a is disconnected without being connected to the private branch exchange 200.

On the other hand, when the amount of traffic in the private branch exchange 200 is small, for example, when a line connection request is made via the subscriber line 5z, the switching control unit 81 uses the switch 7z in the exchange switch unit 7 to switch between the line 5z and the private branch exchange 1. !200.

In addition to the operations described above, the width section control device 100 can perform the following line connection restrictions in response to dial signals.

FIG. 2 is a connection restriction diagram of the subscriber lines 5a to 5z provided in advance in the connection restriction section 82 shown in FIG. Referring to FIG. 2, it can be seen that according to the connection restriction section 82, the line is connected in response to 100 consecutive line connection requests within the restriction rate range of 0 to 100%.

For example, when the restriction rate is 50%, it indicates that a line is connected to the exchange 200 once every two times.

The switching control section 81 controls the connection operation in the exchange switch section 7 based on the connection regulations as shown in FIG. can also be taken into account in connection regulations. That is, when the amount of traffic in the private branch exchange 200 is large, the switching control section 81 analyzes the dial signal, and connects lines to the private branch exchange 200 at the regulation rate as shown in FIG. 2 for each same route.

If the restriction rate shown in FIG. 2 is set according to the traffic volume of the private branch exchange 200, the irritation of the person requesting a line connection can be minimized, and the private branch exchange 200 can be set in the width condition. can be prevented.

FIG. 3 is a procedure diagram showing an example of a line connection regulation procedure in the width section control device shown in FIG. 1.

In this example, for the first line connection request, the line connection is restricted (the line is not connected to the private branch exchange) as a result of the dial signal analysis, and for the next line connection request, the dial signal analysis is regulated. As a result, lines are connected to private branch exchanges without restrictions.

The congestion control device as described above is particularly useful as a width control method when constructing an in-house communication network (class 2 communication carrier) using a private branch exchange.

Effects of the invention C] As described above, according to the invention of claim (1), in the width control device installed separately from the exchange, the line and the exchange are connected in response to the traffic amount in the exchange. Since the switching means is provided, it is possible to prevent an increase in the load to be handled by the exchange due to an increase in line connection requests, and it is possible to prevent the exchange from becoming overwhelmed.

According to the invention of claim (2), since the connection regulating means for regulating the connection operation by the switching means in response to the connection destination signal is provided, the line connection operation can be performed at a reasonable frequency in response to a line connection request. It is done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a width portion control device showing an embodiment of the present invention. FIG. 2 is a connection restriction diagram showing an example of connection restriction of subscriber lines set in advance in the connection restriction section of the width section control device shown in FIG. FIG. 3 is a flowchart showing a line connection regulation procedure in the width section control device shown in FIG. 1. FIG. 4 is a block diagram showing the configuration of a conventional exchange. In the figure, 1a to 1z and 9a to 9z are sender/receiver units, 5a to 5z are subscriber lines, and 6
1 is a serial bus, 7 is an exchange switch section, 8 is a call processing control section, 10 is an announcement section, 81 is a switching control section, 82 is a connection regulation section, and 100 is a width section control device. Figure 2 0 Yen 1L Town Figure 1 Figure 4

Claims (2)

[Claims] (1) A congestion control device that is provided separately from an exchange that performs switching processing for a plurality of lines, and that performs control to prevent the exchange from becoming congested, between the plurality of lines and the exchange. a switching means connected to the exchange and connected to the exchange for each of the plurality of lines; and a traffic detection means connected to the exchange and detecting the amount of traffic in the exchange, the switching means connects to the traffic detection means. A congestion control device responsively connects each of the plurality of lines to the exchange. (2) Each of the plurality of lines transmits a connection destination signal specifying a connection destination of the line, and further includes connection regulation means for regulating the connection operation by the switching means in response to the connection destination signal. term (
1) The congestion control device according to item 1).