JP2006311043A - Private branch exchange system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a private branch exchange system with high reliability capable of continuing communication (speech) by using a particular extension terminal and a particular public line at all times wherein the particular extension terminal and the particular public line are connected to two private branch exchanges via a switching unit, even when one of the private branch exchanges is defective, the other private branch exchange backs up the particular extension terminal and the particular public line by switching the switching unit. <P>SOLUTION: The private branch exchange system comprises: a master private branch exchange 2; a slave private branch exchange 3; the particular extension terminal 4 being a backup object and the switching unit 5a; the particular public line L1 being a backup object in a public network NT and a switching unit 5b; and lines La, Lb for interconnecting the master private branch exchange 2 and the slave private branch exchange 3 for communication (speech). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a private branch exchange system comprising an extension terminal connected to two private branch exchanges via a switching unit and a public line. In particular, when one private branch exchange fails, the connection of the switching unit is switched, This invention relates to a private branch exchange system in which an extension terminal and a public line are connected to the private branch exchange so that the operation can be continued.

  In a conventional private branch exchange system, if the control system of the private branch exchange has a duplex structure of the active system and the standby system, and the active operational system falls into an inoperable state, switch to the standby system and replace the control system One that performs backup while continuing operation is known.

In addition, the two exchanges constitute a normal exchange and an emergency exchange, and even if the emergency exchange is down and the emergency exchange is switched to the emergency exchange, the call on the ISDN line during the call Japanese Patent Application Laid-Open No. 2004-151867 discloses a technique that can maintain a telephone call without disconnecting the call.
JP 2001-103158 A

  However, the prior art switching system must require a switching facility equivalent to the regular switch as an emergency switch in order to rescue all the terminal devices connected to the regular switch, and is normally in a standby state. In order to install the emergency facilities, the cost was doubled and the switching control was complicated.

  The present invention has been made to solve such a problem, and even when two private branch exchanges are installed, the operation is not performed with one as an emergency system and the other as an emergency system. A private branch exchange can be connected to a specific extension terminal and a specific public line via a switching unit. Even if one private branch exchange fails, the switching unit can be switched to connect a specific extension terminal and a specific public line to another It is an object of the present invention to provide a private branch exchange system that is backed up by a private branch exchange and that can always communicate (call) using a specific extension terminal and a specific public line and that has high operational efficiency and high reliability.

  In order to solve the above problems, a private branch exchange system according to the present invention includes a master private branch exchange that accommodates a plurality of extension terminals, a slave private branch exchange that accommodates a plurality of other extension terminals, and a master private branch exchange and a slave private branch exchange. In a private branch exchange system with a plurality of lines connecting between them, the master private branch exchange and the slave private branch exchange respectively register a specific public line and a specific extension terminal in common, and monitor the status of the switching unit, A specific public line and a specific extension terminal can be accommodated through the switching unit.

  The private branch exchange system according to the present invention includes a master private branch exchange that accommodates a plurality of extension terminals, a slave private branch exchange that accommodates another plurality of extension terminals, and a plurality of connections between the master private branch exchange and the slave private branch exchange. In a private branch exchange system equipped with a line, the master private branch exchange and the slave private branch exchange respectively register a specific public line and a specific extension terminal in common, monitor the status of the switching unit, and specify it via the switching unit. The public switching line and the specific extension terminal can be accommodated, so even if a failure occurs in the master private branch exchange in which the specific public line and the specific extension terminal are accommodated and the communication (call) is operated, the switching unit Switch to accommodate a specific public line and a specific extension terminal in a slave private branch exchange and slave private branch exchange It is possible to continue the operation of the communication (call) under the domination.

  In addition, the master private branch exchange and the slave private branch exchange according to the present invention each include a monitoring trunk that monitors the switching state of the switching unit and switches the connection of the switching unit.

  Since the master private branch exchange and the slave private branch exchange according to the present invention each have a monitoring trunk that monitors the switching state of the switching unit and switches the connection of the switching unit, a specific public line and a specific extension terminal are accommodated. Even if one private branch exchange (for example, a master private branch exchange) fails, the switching unit is switched so that a specific public line and a specific extension terminal are accommodated in another private branch exchange (for example, a slave private branch exchange) for communication. (Call) operation can be continued.

  Furthermore, the switching unit according to the present invention is characterized in that the monitoring state of the master private branch exchange and the slave private branch exchange is always notified of the connection state to the master private branch exchange or the slave private branch exchange.

  Since the switching unit according to the present invention always notifies the monitoring trunk of the master private branch exchange and the slave private branch exchange to the connection status to the master private branch exchange or the slave private branch exchange, if there is no notification of the switching state, it is accommodated until now. It is determined that one of the private branch exchanges (for example, the master private branch exchange) has failed, and the switching unit is immediately switched to accommodate the specific public line and the specific extension terminal in the other private branch exchange (for example, the slave private branch exchange). Can do.

  Further, the master private branch exchange and the slave private branch exchange according to the present invention are each operated independently.

  Since the master private branch exchange and the slave private branch exchange according to the present invention are respectively operated independently, only one private branch exchange (for example, master private branch exchange) is backed up by the other private branch exchange (for example, slave private branch exchange). Instead, more public lines and extension terminals can be exchanged and controlled.

  The private branch exchange system according to the present invention includes a master private branch exchange that accommodates a plurality of extension terminals, a slave private branch exchange that accommodates another plurality of extension terminals, and a plurality of connections between the master private branch exchange and the slave private branch exchange. In a private branch exchange system equipped with a line, the master private branch exchange and the slave private branch exchange respectively register a specific public line and a specific extension terminal in common, monitor the status of the switching unit, and specify it via the switching unit. The public switching line and the specific extension terminal can be accommodated, so even if a failure occurs in the master private branch exchange in which the specific public line and the specific extension terminal are accommodated and the communication (call) is operated, the switching unit Switch to accommodate a specific public line and a specific extension terminal in a slave private branch exchange and slave private branch exchange Communication under the control can continue the operation of the (call), it is possible to further enhance a reliability back up the private branch exchange.

  In addition, the master private branch exchange and the slave private branch exchange according to the present invention each have a monitoring trunk for monitoring the switching state of the switching unit and switching the connection of the switching unit, so that a specific public line and a specific extension terminal are accommodated. Even if one private branch exchange (for example, a master private branch exchange) fails, the switching unit is switched so that a specific public line and a specific extension terminal are accommodated in another private branch exchange (for example, a slave private branch exchange). The communication (call) operation can be continued, and the reliability and convenience of the system can be appealed.

  Furthermore, the switching unit according to the present invention always notifies the monitoring trunk of the master private branch exchange and the slave private branch exchange to the connection status to the master private branch exchange or the slave private branch exchange. It is determined that one private branch exchange (for example, master private branch exchange) has failed, and the switching unit is immediately switched to accommodate a specific public line and a specific extension terminal in the other private branch exchange (for example, a slave private branch exchange). It is possible to continue operation without stopping the system.

  Further, since the master private branch exchange and the slave private branch exchange according to the present invention are operated independently, only one private branch exchange (for example, master private branch exchange) is backed up by the other private branch exchange (for example, slave private branch exchange). In addition, more public lines and extension terminals can be exchanged and controlled, and a plurality of private branch exchanges can be operated efficiently and a call by a specific extension terminal can be secured.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The basic technical idea of the present invention is that a system is constructed by two private branch exchanges operating independently of each other, and one private branch exchange (for example, a master private branch exchange or a slave private branch exchange) has failed. In this case, the other private branch exchange (for example, a slave private branch exchange or a master private branch exchange) performs backup and continues operation.

  FIG. 1 is a basic block diagram of an embodiment of a private branch exchange system according to the present invention. In the present embodiment, a case will be described in which one specific public line to be backed up and one specific extension terminal are configured.

  In FIG. 1, a private branch exchange system 1 includes a master private branch exchange 2, a slave private branch exchange 3, a specific public line L1 and switching unit 5a of a public network NT to be backed up, and a specific extension to be backed up. The terminal 4 and the switching unit 5b, the master private branch exchange 2, and the extension terminals EqX1 to EqXn that are not subject to backup, the slave private branch exchange 3, and the extension terminals EqY1 to EqYj that are not subject to backup and the master private branch exchange 2 Are connected to the slave private branch exchange 3 and communicated (communication) with a line La and a line Lb.

  The master private branch exchange 2 changes the switching state of the communication path switch 6 that forms the communication path, the extension trunks LNX1 to LNXn that accommodate the extension terminals EqX1 to EqXn, the extension trunk LX that accommodates the contact d of the switching unit 5b, and the switching unit 5b. Monitor trunk TW3 to be monitored, office trunk trunk TRX accommodating the contact point a of the switching unit 5a, monitoring trunk TW1 monitoring the switching state of the switching unit 5a, line trunks LT1 and LT3 respectively accommodating the line La and the line Lb, and the control device 7. A storage device 8 is provided.

  The communication path switch 6 is connected to the extension trunks LNX1 to LNXn, the extension trunk LX, the monitoring trunk TW3, the office trunk trunk TRX, the monitoring trunk TW1, and the line trunks LT1 and LT3. Form.

  The control device 7 is composed of a CPU (Central Processing Unit) and controls the operation of the master private branch exchange 2 as a whole.

  The storage device 8 is configured by a memory such as an EEPROM or a flash memory, station data, a control program, extension terminals EqX1 to EqXn under the control of the master private branch exchange 2, a specific extension terminal 4 (all are extension numbers), a specific Public line L1 (station line number) and the like are registered. The control device 7 and the storage device 8 are connected to the speech path switch 6 via the control bus BUSa.

  Similarly to the master private branch exchange 2, the slave private branch exchange 3 has a speech path switch 9 that forms a speech path, extension trunks LNY1 to LNYj that accommodate extension terminals EqY1 to EqYj, and an extension trunk LY that accommodates the contact e of the switching unit 5b. The monitoring trunk TW4 for monitoring the switching state of the switching unit 5b, the office trunk TRY for accommodating the contact b of the switching unit 5a, the monitoring trunk TW2 for monitoring the switching state of the switching unit 5a, the line La and the line Lb, respectively. Line trunks LT2, LT4, a control device 10, and a storage device 11 are provided.

  The communication path switch 9 is connected to the extension trunks LNY1 to LNYj, the extension trunk LY, the monitoring trunk TW4, the office trunk TRY, the monitoring trunk TW2, and the line trunks LT2 and LT4. Form.

  The control device 10 is composed of a CPU (Central Processing Unit) and controls the operation of the entire slave private branch exchange 3.

  The storage device 11 comprises a memory such as an EEPROM or a flash memory, station data, a control program, extension terminals EqY1 to EqYj under the control of the slave private branch exchange 3, specific extension terminals 4 (all are extension numbers), specific Public line L1 (station line number) and the like are registered. The control device 10 and the storage device 11 are connected to the speech path switch 9 via the control bus BUSb.

  The switching unit 5a includes a contact a, a contact b, and a common contact c. The contact a is connected to the local trunk trunk TRX of the master private branch exchange 2, and the contact b is connected to the local trunk TRY of the slave private branch exchange 3. The common contact c is connected to a specific public line L1 of the public network NT.

  The switching unit 5a is connected to the monitoring trunk TW1 of the master private branch exchange 2 and the monitoring trunk TW2 of the slave private branch exchange 3, and the common contact c is connected to the contact a (on the master private branch exchange 2 side) or connected to the contact b. Control of the switching state of whether or not (slave private branch exchange 3 side). As a result, the switching unit 5a accommodates the specific public line L1 to be backed up in the public network NT in the master private branch exchange 2 or the slave private branch exchange 3.

  Further, the switching unit 5a notifies the monitoring trunk TW1 of the master private branch exchange 2 and the monitoring trunk TW2 of the slave private branch exchange 3 of the current switching state.

  When the system is started, the switching unit 5a connects the common contact c to the contact a (on the master private branch exchange 2 side), accommodates a specific public line L1 on the master private branch exchange 2 side, and the switching state is on the master private branch exchange 2 side. The monitoring trunk TW1 of the master private branch exchange 2 and the monitoring trunk TW2 of the slave private branch exchange 3 are instructed to switch the connection of the switching unit from the monitoring trunk TW1 or the monitoring trunk TW2, and for some reason (for example, power off When the master private branch exchange 2 fails, the common contact c is switched to the contact b, the specific public line L1 is accommodated on the slave private branch exchange 3, and the switching state is on the slave private branch exchange 3 side. Notification is made to the monitoring trunk TW1 of the master private branch exchange 2 and the monitoring trunk TW2 of the slave private branch exchange 3.

  The switching unit 5b includes a contact d, a contact e, and a common contact f. The contact d is connected to the extension trunk LX of the master private branch exchange 2, the contact e is connected to the extension trunk LY of the slave private branch exchange 3, and the common contact f is connected to a specific extension terminal 4.

  The switching unit 5b is connected to the monitoring trunk TW3 of the master private branch exchange 2 and the monitoring trunk TW4 of the slave private branch exchange 3, and the common contact f is connected to the contact d (on the master private branch exchange 2 side) or connected to the contact e. Control of the switching state of whether or not (slave private branch exchange 3 side). Thus, the switching unit 5b accommodates the specific extension terminal 4 to be backed up in the master private branch exchange 2 or the slave private branch exchange 3.

  Further, the switching unit 5b notifies the current switching state to the monitoring trunk TW3 of the master private branch exchange 2 and the monitoring trunk TW4 of the slave private branch exchange 3.

  When the system is started, the switching unit 5b connects the common contact f to the contact d (on the master private branch exchange 2 side), accommodates the specific extension terminal 4 on the master private branch exchange 2 side, and the switching state is on the master private branch exchange 2 side. The monitoring trunk TW3 of the master private branch exchange 2 and the monitoring trunk TW4 of the slave private branch exchange 3 are instructed to switch the connection of the switching unit from the monitoring trunk TW3 or the monitoring trunk TW4, and for some reason (for example, power off If the master private branch exchange 2 fails, the common contact f is switched to the contact e, the specific extension terminal 4 is accommodated on the slave private branch exchange 3 side, and the switching state is on the slave private branch exchange 3 side. The monitoring trunk TW3 of the master private branch exchange 2 and the monitoring trunk TW4 of the slave private branch exchange 3 are notified.

  The line La and the line Lb connect the line trunk LT1 and the line trunk LT2, and the line trunk LT3 and the line trunk LT4, respectively, and transmit a communication (call) signal between the master private branch exchange 2 and the slave private branch exchange 3.

  Usually, the master private branch exchange 2 accommodates extension terminals EqX1 to EqXn, a specific extension terminal 4 and a specific public line L1 of the public network NT, and an extension call with the master private branch exchange 2 and an extension with the slave private branch exchange 3 The private branch exchange 3 accommodates the extension terminals EqY1 to EqYj, and operates with the private line exchange and the master private branch exchange 2 in the slave private branch exchange 3. Operate extension calls independently.

  When the master private branch exchange 2 fails (for example, power is cut off), the slave private branch exchange 3 accommodates the extension terminals EqY1 to EqYj, the specific extension terminal 4 and the specific public line L1 of the public network NT, and is a slave. An extension call in the private branch exchange 3 and a station line call via a specific public line L1 are operated.

  As a result, the specific extension terminal 4 and the specific public line L1 to be backed up can always continue communication (call), so that the reliability of the system can be improved.

  As described above, since the master private branch exchange 2 and the slave private branch exchange 3 according to the present invention operate independently, one private branch exchange (for example, the master private branch exchange 2) is simply used as the other private branch exchange (for example, the slave private branch exchange). Besides being backed up by the private branch exchange 3), more public lines and extension terminals can be exchanged and controlled, and a plurality of private branch exchanges can be operated efficiently and a call by a specific extension terminal can be secured. .

  Next, an extension call between the specific extension terminal 4 and the extension terminal EqX1 of the master private branch exchange 2, and an extension call between the specific extension terminal 4 and the extension terminal EqY1 of the slave private branch exchange 3 will be described.

  FIG. 2 is a route explanatory diagram of the extension call in the first embodiment of the specific extension terminal according to the present invention. In the first embodiment, when a specific extension terminal 4 is accommodated in the master private branch exchange 2, the extension terminal EqX1 of the master private branch exchange 2 calls the specific extension terminal 4, and the slave private branch exchange 3 A route in a case where the extension terminal EqY1 calls a specific extension terminal 4 will be described.

  In this case, when the common contact f of the switching unit 5b is connected to the contact d, the specific extension terminal 4 is accommodated in the extension trunk LX, and the specific extension terminal 4 is under the control of the master private branch exchange 2.

  Further, the switching unit 5b notifies the monitoring trunk TW3 of the master private branch exchange 2 and the monitoring trunk TW4 of the slave private branch exchange 3 with information that can be recognized as “connected to the master private branch exchange 2”.

  When the extension terminal EqX1 of the master private branch exchange 2 tries to call a specific extension terminal 4, the control device 7 checks the monitoring trunk TW3 corresponding to the specific extension terminal 4, and “is connected to the master private branch exchange 2 side. Therefore, it is handled as an extension terminal accommodated in its own station (master private branch exchange 2), and a specific extension terminal 4 is called on the path Pa (indicated by a one-dot chain line) via the extension trunk LX.

  On the other hand, when the extension terminal EqY1 of the slave private branch exchange 3 tries to call the specific extension terminal 4, the control device 10 checks the monitoring trunk TW4 corresponding to the specific extension terminal 4, and “connects to the master private branch exchange 2 side”. Therefore, the line trunk LT4 (or line trunk LT2) is captured and transmitted to the master private branch exchange 2, and the path Pb route (one point) via the extension trunk LX of the master private branch exchange 2 A specific extension terminal 4 is called by a chain line display).

  FIG. 3 is an explanatory diagram of the extension call route of the specific extension terminal according to the second embodiment of the present invention. In the second embodiment, when a specific extension terminal 4 is accommodated in the slave private branch exchange 3, the extension terminal EqX1 of the master private branch exchange 2 calls the specific extension terminal 4, and the slave private branch exchange 3 A route in a case where the extension terminal EqY1 calls a specific extension terminal 4 will be described.

  In this case, when the common contact f of the switching unit 5b is connected to the contact e, the specific extension terminal 4 is accommodated in the extension trunk LY, and the specific extension terminal 4 is under the control of the slave private branch exchange 3.

  Further, the switching unit 5b notifies the monitoring trunk TW3 of the master private branch exchange 2 and the monitoring trunk TW4 of the slave private branch exchange 3 with information that can be recognized as “connected to the slave private branch exchange 3”.

  When the extension terminal EqY1 of the slave private branch exchange 3 tries to call the specific extension terminal 4, the control device 10 checks the monitoring trunk TW4 corresponding to the specific extension terminal 4, and “is connected to the slave private branch exchange 3 side. Therefore, it is handled as an extension terminal accommodated in its own station (slave private branch exchange 3), and a specific extension terminal 4 is called on the path Pc route (indicated by a one-dot chain line) via the extension trunk LY.

  On the other hand, when the extension terminal EqX1 of the master private branch exchange 2 tries to call a specific extension terminal 4, the control device 7 checks the monitoring trunk TW3 corresponding to the specific extension terminal 4, and “connects to the slave private branch exchange 3 side”. The line trunk LT3 (or the line trunk LT1) is captured and transmitted to the slave private branch exchange 3, and the path Pd route (one point) via the extension trunk LY of the slave private branch exchange 3 is obtained. A specific extension terminal 4 is called by a chain line display).

  Subsequently, when the master private branch exchange 2 falls into an operation stop state (failure), the slave private branch exchange 3 backs up the specific extension terminal 4 and the specific public line L1, and the specific extension terminal 4 and the slave private branch exchange 3 An extension call with the extension terminal EqY1 and a local call between the specific extension terminal 4 and the public network NT via the specific public line L1 will be described.

  FIG. 4 is an explanatory diagram of the route of the extension call and the office call in the third embodiment of the specific extension terminal according to the present invention. In the third embodiment, when the specific extension terminal 4 and the specific public line L1 are accommodated in the slave private branch exchange 3, the specific extension terminal 4 calls the extension terminal EqY1 of the slave private branch exchange 3. A route in a case where the specific extension terminal 4 calls the public network NT via the specific public line L1 will be described.

  In this case, since the master private branch exchange 2 is in an operation stop state (failure), the common contact f of the switching unit 5b is connected to the contact e, and the common contact c of the switching unit 5a is connected to the contact b. The specific extension terminal 4 is accommodated in the extension trunk LY, and the specific public line L1 is accommodated in the office line trunk TRY, so that the specific extension terminal 4 and the specific public line L1 are controlled by the slave private branch exchange 3. Below.

  The switching unit 5a notifies the monitoring trunk TW2 of the slave private branch exchange 3 of information that can be recognized as “connected to the slave private branch exchange 3”, and the switching unit 5b monitors the slave private branch exchange 3. Information that can be recognized as “connected to the slave private branch exchange 3” is notified to the trunk TW4.

  When a specific extension terminal 4 makes an outgoing call to call the extension terminal EqY1 of the slave private branch exchange 3, the specific extension terminal 4 transmits the call via the extension trunk LY of the slave private branch exchange 3 so that the specific extension terminal 4 becomes the slave private branch exchange 3 Since the terminal operates as an extension terminal, the extension terminal EqY1 is called on the path Pe (indicated by a dashed line).

  On the other hand, when a specific extension terminal 4 tries to make a call to the public network NT, the call is sent via the extension trunk LY of the slave private branch exchange 3 and then a call special number to the public network NT is received. The monitoring trunk TW2 corresponding to the office trunk TRY to be checked is checked and it can be determined that it is “connected to the slave private branch exchange 3 side”. Therefore, the office trunk TRY is captured and the path Pf is routed (indicated by a one-dot chain line) Call to public network NT.

  FIG. 5 is an explanatory diagram of the route of a local line call of the fourth embodiment of the specific extension terminal according to the present invention. In the fourth embodiment, when the specific extension terminal 4 and the specific public line L1 are accommodated in the slave private branch exchange 3, the specific extension terminal 4 is connected from the public network NT via the specific public line L1. The route of the calling case will be described.

  In this case, since the master private branch exchange 2 is in an operation stop state (failure), the common contact f of the switching unit 5b is connected to the contact e, and the common contact c of the switching unit 5a is connected to the contact b. The specific extension terminal 4 is accommodated in the extension trunk LY, and the specific public line L1 is accommodated in the office line trunk TRY, so that the specific extension terminal 4 and the specific public line L1 are controlled by the slave private branch exchange 3. Below.

  The switching unit 5a notifies the monitoring trunk TW2 of the slave private branch exchange 3 of information that can be recognized as “connected to the slave private branch exchange 3”, and the switching unit 5b monitors the slave private branch exchange 3. Information that can be recognized as “connected to the slave private branch exchange 3” is notified to the trunk TW4.

  When there is an incoming call from the public network NT via a specific public line L1, the control device 10 detects the incoming call via the office line trunk TRY. When the destination from the public network NT is the specific extension terminal 4, the control device 10 can check the monitoring trunk TW4 corresponding to the specific extension terminal 4 and determine that it is “connected to the slave private branch exchange 3”. Therefore, the specific extension terminal 4 is called through the extension trunk LY.

  As described above, the master private branch exchange 2 and the slave private branch exchange 3 according to the present invention include the monitoring trunks TW1 to TW4 for monitoring the switching state of the switching units 5a and 5b and switching the connection of the switching units 5a and 5b, respectively. Even if a failure occurs in one private branch exchange (for example, master private branch exchange 2) in which a specific public line L1 and a specific extension terminal 4 are accommodated, the switching units 5a and 5b are switched to switch the specific public line L1. In addition, the specific extension terminal 4 can be accommodated in another private branch exchange (for example, the slave private branch exchange 3) and the operation of communication (call) can be continued, and the reliability and convenience of the system can be appealed.

  In addition, the switching units 5a and 5b according to the present invention always notify the monitoring trunks TW1 to TW4 of the master private branch exchange 2 and the slave private branch exchange 3 of the connection state to the master private branch exchange 2 or the slave private branch exchange 3. If there is no notification of the switching state, it is determined that one private branch exchange (for example, master private branch exchange 2) that has been accommodated so far has failed, and the switching units 5a and 5b are immediately switched to the specific public line L1 and the specific extension. The terminal 4 can be accommodated in the other private branch exchange (for example, the slave private branch exchange 3), and the operation can be continued without stopping the system.

  In this embodiment, one specific public line L1 and one specific extension terminal 4 are configured. However, the number of specific public lines may be two or more. Two or more units may be used.

  Further, the extension terminals EqX1 to EqXn accommodated in the master private branch exchange 2 are to be backed up, the slave private branch exchange 3 is not accommodated with the extension terminals EqY1 to EqYj, and the slave private branch exchange 3 is a private branch exchange dedicated for backup. If 2 falls into an operation stop state (failure), the extension terminals EqX1 to EqXn may be backed up by the slave private branch exchange 3 to continue the communication (call) operation.

  As described above, the private branch exchange system 1 according to the present invention includes a master private branch exchange 2 that accommodates a plurality of extension terminals EqX1 to EqXn, a slave private branch exchange 3 that accommodates a plurality of other extension terminals EqY1 to EqYj, In the private branch exchange system 1 having a plurality of lines La and Lb that connect the master private branch exchange 2 and the slave private branch exchange 3 to each other, the master private branch exchange 2 and the slave private branch exchange 3 are respectively a specific public line L1 and a specific public line L1. Are registered in common, and the status of the switching units 5a and 5b is monitored, and the specific public line L1 and the specific extension terminal 4 can be accommodated via the switching units 5a and 5b. A failure occurs in the master private branch exchange 2 in which the public line L1 and the specific extension terminal 4 are accommodated and communication (call) is operated. Even so, the switching units 5a and 5b are switched so that the specific public line L1 and the specific extension terminal 4 are accommodated in the slave private branch exchange 3, and the communication (call) operation is continued under the control of the slave private branch exchange 3. It is possible to back up the private branch exchange (for example, the master private branch exchange 2) to further increase the reliability.

  The private branch exchange system according to the present invention constructs a system with two private branch exchanges operating independently of each other, and a failure occurs in one private branch exchange (for example, a master private branch exchange or a slave private branch exchange). Is to be backed up by the other private branch exchange (for example, a slave private branch exchange or a master private branch exchange) and continued to operate, and should be applied to any private branch exchange system that cannot temporarily stop communication (call) operation. Can do.

Block diagram of a basic embodiment of a private branch exchange system according to the present invention First embodiment extension call route explanatory diagram of a specific extension terminal according to the present invention Second embodiment extension call route explanation diagram of specific extension terminal according to this invention Third embodiment of a specific extension terminal according to the present invention Route explanatory diagram of extension call and office line call Fourth embodiment of a specific extension terminal according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Private branch exchange system 2,3 Private branch exchange 4 Specific extension terminal 5a, 5b Switching unit 6,9 Communication path switch 7,10 Control device 8,11 Storage device BUSa, BUSb Control bus BUS
TW1 to TW4 Monitoring trunk LT1 to LT4 Line trunk TRX, TRY Office trunk LX, LY, LNX1 to LNXn, LNY1 to LNYj Extension trunk EqX1 to EqXn, EqY1 to EqYj Extension terminal L1 Specific public line LaNT, Lb line

Claims (4)

A private branch exchange having a master private branch exchange accommodating a plurality of extension terminals, a slave private branch exchange accommodating another plurality of extension terminals, and a plurality of lines connecting the master private branch exchange and the slave private branch exchange. In the exchange system,
The master private branch exchange and the slave private branch exchange respectively register a specific public line and a specific extension terminal in common, monitor the status of the switching unit, and via the switching unit, the specific public line and the specific private branch exchange A private branch exchange system characterized in that it can accommodate extension terminals. 2. The private branch exchange system according to claim 1, wherein each of the master private branch exchange and the slave private branch exchange includes a monitoring trunk that monitors a switching state of the switching unit and switches connection of the switching unit. 3. The switching unit always notifies the monitoring trunk of the master private branch exchange and the slave private branch exchange of a connection state to the master private branch exchange or the slave private branch exchange. Private branch exchange system as described. The private branch exchange system according to claim 1, 2, or 3, wherein the master private branch exchange and the slave private branch exchange are each operated independently.

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