JPH0723105A - Exchange system - Google Patents

Abstract

PURPOSE:To attain smooth retrieval by providing a memory storing an idle busy state of a communication line, a means comparing exchange numbers, and a channel decision section deciding the retrieval sequence of the busy/idle state and selecting a communication line of the idle/busy state. CONSTITUTION:When a telephone terminal makes dialing, its dial signal is sent to an own station number memory 21 via a line control section 20 and a channel decision control section 24 and its own station number is read and fed to the control section 24. Furthermore, the dial signal is fed to other station number memory 22 via the control section 24, the other station number is read and fed to the control section 24. The control section 24 compares the own station number with the other station number and confirms it that the own station number is larger than the other station number and it is provided as an output. The control section 24 receiving the output retrieves the management memory 23 in the order of younger numbers of the lines, that is, so that the number is sequentially increased from a speech line and an idle/busy line is selected. Through the retrieval, a speech line 17 being a 4th line is selected and a connection instruction of the line 17 is made from the control section 24 to the control section 20 to connect exchanges.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exchange system,
In particular, the present invention relates to an exchange system that searches for the availability of communication lines connected between exchanges.

[0002]

2. Description of the Related Art Generally, an exchange system is provided with a plurality of exchanges to which a plurality of telephone terminals are connected. A plurality of communication lines are connected between the plurality of exchanges, and a call signal is sent from the calling side telephone terminal to the called side telephone terminal by selecting this specific communication line.

In such an exchange system, when a communication line is in a call state, an open / closed communication line is selected so that a call signal from another telephone terminal or the like is not transmitted to the communication line.

For this management, each exchange is provided with a memory for storing the call status of the communication line, and when a new call is made, the memory is searched to select the communication line in the idle state.

The selection of the communication line in the idle / closed state is decided at the time of designing the exchange, and the exchanges of the same model usually have the same selection method. Also, even if the model is different, many are designed by the same method.

In such an exchange system, when the communication lines in the idle / closed state are simultaneously selected from both exchanges facing each other, the same communication line in the idle / closed state may be selected. Since the selected communication line is switched to the call state by selection, it becomes impossible to connect.

Therefore, there is a problem that both exchanges have to repeat the selection of the communication line.

In particular, when the next two exchanges are selected at approximately the same time, the selecting operation is continuously repeated, and there is a problem that the communication on the communication line becomes impossible.

Therefore, the exchange system of the present invention is to provide an exchange system in which a communication line in an idle state is smoothly selected.

[0010]

DISCLOSURE OF THE INVENTION The present invention is directed to one exchange to which a plurality of telephone terminals are connected, and another exchange to which a plurality of communication lines connected to the one exchange are attached and a plurality of telephone terminals are connected. A memory for storing the local station number, the other station number, the dial number, the availability of the communication line, and the like, which are respectively provided in the one exchange and the other exchange, and the one exchange and the other A comparator provided in each of the exchanges for comparing the one exchange number with the other exchange number, and the output of this comparator determines the search order of the idle state of the communication line stored in the memory. And a communication path determining unit that selects the communication line.

Further, the present invention provides an exchange system wherein the exchange number is a station number of the exchange.

Further, the present invention provides an exchange system wherein the exchange number is a dial number of a telephone terminal.

[0013]

When the availability of the communication line is searched, the exchange number of 1 is compared with the numbers of other exchanges to determine the search order of each exchange. In both exchanges, the communication lines in the empty / closed state are always searched in a different order. As a result, a communication line in an empty / closed state is brought into a use state to search less, and a connection failure state is reduced.

Further, the exchange number is compared by the exchange number of the exchange or the dial number of the telephone terminal to prevent the same communication line from being searched from the same direction at the same time.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the exchange system of the present invention will be described below with reference to the accompanying drawings.

The exchange system 10 of the present invention includes a plurality of terminal lines 11a and 1a to which a plurality of telephone terminals (not shown) are connected.
.., 12a, 12b .., 13a, 13b .. are provided with a plurality of exchanges 14, 15, 16.

A plurality of communication lines 17, 18 and 19 each having a predetermined line order are connected between these exchanges.

As shown in FIG. 2, these exchanges, for example, the exchange 14 are provided with a line control unit 20 for controlling connection between a plurality of terminal lines 11a, 11b ... And a plurality of communication lines 17, 18.

This line control unit 20 stores its own station number (20,645) as shown in FIG. 3 and its own station number memory 21, and another station number (20,609, as shown in FIG. 4).
Other station station number memory 2 for storing 20, 651, ...
2 、 Communication line 1 with line order as shown in Fig. 5
A communication path determination control unit 24 is provided to which a management memory 23 for storing the used lines (indicated by 1) and the open / closed lines (indicated by 0) of 7 and 18 is connected.

A case in which the telephone terminal 11a talks to the telephone terminal 12a in the exchange system 10 thus configured will be described with reference to the flowchart of FIG.

First, when the telephone terminal 11a makes a call, the call signal is sent to the own station number memory 21 via the line control unit 20 and the call path determination control unit 24, and the own station number 2
0,645 is read out and sent to the communication path decision control unit 24 (S
1).

Further, the calling signal is sent to the other station station number memory 22 via the speech path determination control section 24, and the other station station number 2 is sent.
0,609 is read out and sent to the communication path decision control unit 24 (S
2).

The call path determination control unit 24 compares the own station number 20,645 and the other station number 20,609 by a comparator (not shown), and the own station number 20,645 becomes the other station number. After confirming that it is larger than 20,609, it is output (S3). In response to this output, the call path determination control unit 24 searches the management memory 23 in order from the number with the smallest line order, that is, from the call line 1 in order, and selects the idle line (displayed with 0) (S4).

By this search, the call line 17 of the fourth line is selected (S5) and the fourth line area of the management memory 23 is stored during the call (indicated by 1). From the call path determination control unit 24, the line control unit 20 is connected to the call line 17 of the fourth line.
And the exchange 14 and the exchange 15 are connected (S5).

The exchange 15 transfers from the exchange 14 to the telephone line 17
When a calling signal is received via the, it is confirmed whether or not the communication line 17 is idle. If it is free, after the call is stored in the management memory of the exchange 15, the exchange 14 is notified of the connection process, and the telephone between the telephone terminal 11a and the telephone terminal 12a is performed (S6).

In the above case, when comparing the own station number and the other station number with a comparator (not shown), if the own station number is smaller than the other station number, the communication path decision control unit 24
Searches for an open / closed line stored in the management memory 23 in the direction of the call line, which gradually decreases from the old number, that is, the call line 30 (S7). Other processing is the same as that described above.

If there is no free line in the search of the telephone line 17, the exchange 14 notifies the telephone terminal 11a of the inability to call and prompts another call (S8).

When the number of telephone terminals increases in such a call search, the call may be simultaneously sent from the exchange 15 to the exchange 14 while the call is being sent from the exchange 14 to the exchange 15.

Even in such a case, the exchange 15 has a smaller comparison value than the exchange 14. Therefore, the exchange 1
In the case of No. 5, the search for the empty / busy status is performed from the line with the old number, and there is less competition with the search of the exchange 14, so that the 26th line is properly selected.

As a result, even if the exchange 14 and the exchange 15 simultaneously search for a call line in an idle state, it is less likely that the same call line is selected at the same time. To prevent the connection from becoming impossible.

To determine the exchange search order, not only the station number but also the dial number may be used.

[0032]

According to the present invention, a plurality of telephone terminals are connected.
Switch, another switch having a plurality of communication lines connected to the one switch and a plurality of telephone terminals connected thereto, the one switch, the own station number provided in the other switch, etc. A memory for storing a station number, a dial number, a communication line availability, etc., and a comparison for comparing the one exchange number and the other exchange number respectively provided in the one exchange and the other exchange. And a communication path determining unit that determines the search order of the air-blocking status of the communication line stored in the memory by the output of the comparator and selects the communication line in the air-blocking status. The situation can be searched smoothly.

Further, since the exchange number is the station number or dial number of the exchange, the exchanges can be searched accurately.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of an exchange system of the present invention.

FIG. 2 is a block diagram showing a main part of FIG.

FIG. 3 is an explanatory diagram showing a storage example of the memory of FIG.

FIG. 4 is an explanatory diagram showing a storage example of the memory of FIG.

5 is an explanatory diagram showing a storage example of the memory of FIG. 2. FIG.

FIG. 6 is a flowchart explaining the operation of the exchange system of the present invention.

[Explanation of symbols]

 10 exchange systems 11a, 11b ... terminal lines 12a, 12b ... terminal lines 13a, 13b ... terminal lines 14, 15, 16 exchanges 17, 18, 19 communication lines 20 line control units 21, 22, 23 memory 24 call path determination control unit

Claims (3)

[Claims] 1. An exchange to which a plurality of telephone terminals are connected, another exchange to which a plurality of communication lines connected to the one exchange are attached and a plurality of telephone terminals are connected, the one exchange, A memory that is provided in each of the other exchanges and stores the local station number, the other station number, the dialed number, the availability of the communication line, and the like; and the one exchange and the other exchange that are respectively provided in the one exchange A comparator for comparing an exchange number with the other exchange number, and a call for selecting the communication line in the open / closed state by determining the search order of the open / closed state of the communication line stored in the memory by the output of the comparator. An exchange system comprising a route determination unit and. 2. The exchange system according to claim 1, wherein the exchange number is a station number of the exchange. 3. The exchange system according to claim 1, wherein the exchange number is a dial number of a telephone terminal.