JPH08163240A - Private branch exchange - Google Patents

Abstract

PURPOSE: To secure a call with a trunk line, to which an extension telephone set is connected, without providing any individual telephone set and waiting for fault recovery. CONSTITUTION: When the fault of trunk lines 100-1 and 100-2 are detected, fault detecting circuits 3-1 and 3-2 respectively issue fault reports to an exchange control part 6, and control to switch switches 5-1 and 5-2 based on the information being used by other trunk interfaces 2-2 and 2-1 from the exchange control part 6. By that switching control, the switches 5-1 and 5-2 switch the connection between the trunk interfaces 2-1 and 2-2 and the trunk lines 100-1 and 100-2. At the time of this switching control, the exchange control part 6 controls a time division switch 7 so that the trunk interfaces 2-1 and 2-2 can be connected to an extension interface 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange, and more particularly to a failure detection function of a central line interface in a private branch exchange.

[0002]

2. Description of the Related Art Conventionally, in a private branch exchange, if a station line interface fails due to some cause, the station line interface that has failed cannot be used until the cause is removed. Until that time, I use another station line.

In order to solve this problem, a stand-alone telephone and a switch for directly connecting the stand-alone telephone to an office line when a failure occurs in the private branch exchange are provided so that the stand-alone telephone does not have to wait for failure recovery. A technology has been proposed that enables to secure a local line call by the. This technique is described in detail in JP-A-63-290443.

[0004]

DISCLOSURE OF THE INVENTION In the above-mentioned conventional private branch exchange, failure recovery is provided by providing a single telephone and a switch for directly connecting the single telephone to an office line when a failure occurs in the private branch exchange. Since a line call from a single phone is secured without waiting for a call, if a failure occurs during a call, go to the single phone to secure the call, or wait until the failure is restored to another station. You must use lines.

Therefore, an object of the present invention is to solve the above-mentioned problems and to secure a telephone call with a station line to which an extension telephone is connected without providing a single telephone and without waiting for failure recovery. To provide a private branch exchange.

[0006]

A private branch exchange according to the present invention comprises first and second private branch exchanges respectively connected to first and second central office lines.
Private branch exchange including first and second trunks for detecting a failure in each of the first and second trunks
And the first and second switching means for switching the connection between the first and second station lines and the first and second trunks according to the detection results of the first and second detection means. 2 switching means and the first and second switching means
And a connecting means for connecting the trunk whose extension is not detected by the first and second detecting means when the connection between the second station line and the first and second trunks is switched to the extension telephone. It has and.

The other private branch exchange according to the present invention corresponds to the other of the first and second detecting means when one of the first and second detecting means detects a failure, in addition to the above-mentioned configuration. Determination means for determining whether the trunk is in use,
And a means for controlling the connecting means so as to connect the trunk to the extension telephone when the judging means judges that the trunk is not in use.

[0008]

When the failure detection circuit detects the failure of the trunk interface, if the other trunk interface is not in use, the failure detection circuit controls the switch to change the station line connected to the failed trunk interface to another. Connect to an extension telephone via the trunk interface.

With this, it is possible to secure a call with the station line to which the extension telephone is connected without providing a single telephone and without waiting for failure recovery.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, station lines 100-1, 100-
2 is normally connected to the extension telephone 9 via the trunk interfaces 2-1 and 2-2 of the office line interface 1, the time division switch 7 and the extension interface 8, respectively.

In the office line interface 1, the trunk interfaces 2-1 and 2-2 are respectively in failure detection circuits 3.
The failure is detected by -1, 3-2. That is, the failure detection circuits 3-1 and 3-2 detect the voltage and current values of the station lines 100-1 and 100-2, respectively, and when these values are not normal, the signal line to the exchange control unit 6 is sent. A failure notification is issued via 102 and the corresponding relays 4-1 and 4-2 are controlled to switch 5
1, 5-2 trunk interface 2-1 and 2-
2 and the station lines 100-1 and 100-2 are switched.

In this case, the failure detection circuits 3-1 and 3-2 are based on the in-use information of the other trunk interfaces 2-2 and 2-1 inputted from the exchange control unit 6 via the signal line 101, respectively. Switching control of the switches 5-1 and 5-2 is performed. The exchange control unit 6 controls the time-division switch 7 and determines whether or not the trunk interfaces 2-1 and 2-2 are in use, based on the control contents, and determines whether or not the signal line 101 is in use.
Is notified to the failure detection circuits 3-1 and 3-2.

For example, the trunk interface 2-1
When both 2-2 are normal, the switch 5-1 connects the office line 100-1 to the trunk interface 2-1 and the switch 5-2 connects the office line 100-2 to the trunk interface 2-2.

When a failure of the trunk interface 2-1 is detected by the failure detection circuit 3-1, the switch 5-1 of the failure detection circuit 3-1 includes the station line 100-1 and the connection line 1.
The relay 4-1 is controlled so as to connect with 10.

At this time, when the failure detection circuit 3-2 receives the failure notification from the failure detection circuit 3-1, it refers to the busy information from the exchange control unit 6 to check the trunk interface 2-.
It is determined whether or not 2 is in use. When the failure detection circuit 3-2 determines that the trunk interface 2-2 is not in use, the switch 5-2 switches the trunk interface 2-2.
The relay 4-2 is controlled so that the relay 4-2 is connected to the connection line 110.

As a result, the office line 100-1 is connected to the extension telephone 9 via the trunk interface 2-2, the time division switch 7 and the extension interface 8.
In this case, the exchange control unit 6 uses the trunk interface 2
-2 and the extension interface 8 are controlled by the time divisional switch 7. Therefore, the extension telephone 9 is the station line 1
Even if the trunk interface 2-1 breaks down while making a call with 0-1, the extension telephone 9 and the office line 100 are switched to another trunk interface 2-2.
A call with -1 can be secured.

On the other hand, the trunk interface 2-
When the failure of circuit 2 is detected by the failure detection circuit 3-2, the failure detection circuit 3-2 controls the relay 4-2 so that the switch 5-2 connects the office line 100-2 and the connection line 110. .

At this time, when the failure detection circuit 3-1 receives the failure notification from the failure detection circuit 3-2, it refers to the busy information from the exchange control unit 6 to check the trunk interface 2-.
It is determined whether 1 is in use. When the failure detection circuit 3-1 determines that the trunk interface 2-1 is not in use, the switch 5-1 switches the trunk interface 2-1.
The relay 4-1 is controlled so that the relay 4-1 is connected to the connection line 110.

As a result, the office line 100-2 is connected to the extension telephone 9 through the trunk interface 2-1, the time division switch 7 and the extension interface 8.
In this case, the exchange control unit 6 uses the trunk interface 2
The time divisional switch 7 is controlled so as to connect -1 to the extension interface 8. Therefore, the extension telephone 9 is the station line 1
Even if the trunk interface 2-2 fails during a call by using 00-2, the extension telephone 9 and the office line 100 are switched by switching to another trunk interface 2-1.
-It is possible to secure a call with -2.

Thus, the trunk interface 2-
If the other trunk interfaces 2-2 and 2-1 are not in use when a failure is detected in 1 and 2-2, the office line 1 connected to the trunk interfaces 2-1 and 2-2
00-1, 100-2 to another trunk interface 2
By controlling the failure detection circuits 3-1 and 3-2 to connect to the extension telephone 9 via -2,2-1, the extension telephone 9 can be operated without providing a single telephone and without waiting for failure recovery. Connected station lines 100-1, 100
-It is possible to secure a call with -2.

[0022]

As described above, according to the present invention, first and second detecting means for detecting a failure in each of the first and second trunks respectively connected to the first and second office lines. The trunk whose extension is not detected by the first and second detection means when the connection between the first and second office lines and the first and second trunks is switched according to the detection result of By connecting to the telephone, it is possible to secure a call with the office line to which the extension telephone is connected without providing a single telephone and without waiting for failure recovery.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

[Explanation of symbols]

 1 Station Line Interface 2-1 and 2-2 Trunk Interface 3-1 and 3-2 Failure Detection Circuit 4-1 and 4-2 Relay 5-1 and 5-2 Switch 6 Exchange Controller 9 Extension Telephone 100-1, 100-2 Line

Claims (2)

[Claims] 1. A private branch exchange including first and second trunks connected to first and second office lines, respectively, wherein the first and second trunks detect a failure in each of the first and second trunks. A first detection means and a first switching means for switching the connection between the first and second station lines and the first and second trunks according to the detection results of the first and second detection means. And second switching means, and when the first and second switching means switch the connection between the first and second office lines and the first and second trunks, the first and second switching means are connected. A private branch exchange comprising: a connecting means for connecting a trunk whose failure is not detected by the second detecting means to an extension telephone. 2. A judging means for judging whether or not a trunk corresponding to the other of the first and second detecting means is in use when one of the first and second detecting means detects a failure, 2. A private branch exchange according to claim 1, further comprising means for controlling the connecting means so as to connect the trunk to the extension telephone when the judging means judges that the trunk is not in use.