JP4017298B2 - Private branch exchange system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a private branch telephone exchange system, in private telephone exchange which is connected via a signal link, a switch to operate one at all times, in the case of using one as a backup for exchange, at each of the automatic or manual mode The present invention relates to an exchange switching method for switching.
[0002]
[Prior art]
A private branch exchange system that connects private telephones with each other and external lines is used, and it is proposed to switch to a standby exchange when a failure occurs in the active exchange. In the switching method in the conventional switching system, when switching from the active switching system to the standby switching system, the call that was in a call was once disconnected. For this reason, calls that have been connected must be disconnected and reconnected again after a failure that hinders the use of the active switch, before switching to the standby switch. In the case of a call, it was forced to hang up once, which was a serious problem in 110 and 119 emergency communication networks in the event of a disaster.
[0003]
[Problems to be solved by the invention]
The present invention has been made to solve such a conventional problem, and when a failure that impedes the operation system switch occurs, it can be automatically switched to the standby system switch, It is an object of the present invention to provide a private branch exchange system that can be easily switched from any location and can be switched without affecting any connected call.
[0004]
[Means for Solving the Problems]
To achieve the above object, the present invention includes a plurality of private telephone exchange for use as the active system switch or standby switch, when a failure in the active system switch occurs, premises switch to the standby exchange side in telecommunication systems, a plurality of private branch telephone exchange is connected to the state information of the plurality of line circuits and each trunk circuit of the active system switch via a common line interface circuit for transmitting continuously to the standby exchange, the Status information receiving means for receiving status information of the active system switch via the common line interface circuit when used as a standby system switch, and a fault for notifying the standby system switch of occurrence of a fault when used as the active system switch When a failure occurs during use as a notification means and the active exchange, the failure notification means passes the failure to the standby exchange. Switching means for performing switching connection to the standby exchange without disconnecting a call during a call, and the state information receiving means includes a state for each of the plurality of line circuits and trunk circuits. The private branch exchange system is characterized in that when a switching connection by the switching means occurs during reception of information, switching is not performed for the circuit relating to the status information being received .
[0005]
Further, the present invention has an initial setting means for performing an initial setting on the active exchange when the switching by the switching means occurs, and as a standby exchange, and after the initial setting by the initial setting means, The status information receiving means of the exchange that has become the standby system exchange uses the exchange switched and connected by the switching means as the active exchange, and receives the status information of the active exchange through the common line interface circuit. It is a featured private branch exchange system.
[0010]
The present invention notifies the call information of the active exchange through the signal link, and enables switching without affecting the call in progress when switching occurs.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
An embodiment of the private branch exchange system according to the present invention will be described with reference to FIGS. FIG. 1 is an explanatory diagram of the configuration of the private branch exchange system according to the embodiment. FIG. 2 is an explanatory diagram of a line state management memory in the private branch exchange system according to the embodiment. FIG. 3 is an explanatory diagram of a hardware / software interface in the private branch exchange system according to the embodiment. FIG. 4 is a connection explanatory diagram when the private branch exchange system of the embodiment is the active exchange A. FIG. 5 is a connection explanatory diagram when the private branch exchange system of the embodiment is the active exchange B. FIG. 6 is an explanatory diagram of a flowchart for switching control of the active exchange in the embodiment. FIG. 7 is a flowchart for explaining the switching control of the standby switch in the embodiment.
[0012]
Examples will be described. As shown in FIG. 1, the private branch exchange system according to the present embodiment includes an exchange A, an exchange B, and a switching device (BECHU) 3. Exchange A and exchange B have communication path switches 11 and 21, central processing units (CPU) 12 and 22, storage devices (MEM) 13 and 23, input / output control devices (IOC) 14 and 24, and maintenance panel (MP) 15. , 25, failure occurrence transmitting / receiving devices (ALC) 16, 26, line circuits (LIN) 17, 27, trunk circuits (TRK) 18, 28, common line interface circuits (CSU) 19, 29, and the like. The storage devices 13 and 23 store an exchange program, control data, and the like. The central control devices 12 and 22 control the communication path switches 11 and 21 by the exchange program to control the line circuits 17 and 27 and the trunk circuit 18 and Connect between 28. The maintenance panels 15 and 25 are connected to the bus via the input / output control devices 14 and 24 and can exchange information with the central processing units 12 and 22. The failure occurrence transmission / reception devices 16 and 26 transmit information on a failure that has occurred in their own exchange to other exchanges via the failure signal line 41, and information on failures that have occurred in other exchanges via the failure signal line 41. Receive via. The common line interface circuits 19 and 29 are used for transmitting connection information of the exchanges in operation via the connection signal line 42.
[0013]
An example of a memory for managing the state of each of the line circuits 17 and 27 and the trunk circuits 18 and 28 in the exchange system of the embodiment is shown in FIG. In this memory, contents for understanding the circuit connection partner, lamp status, etc. are recorded, and the management memories of the active exchange and the standby exchange must always match. When there is a change in the memory contents in the active exchange, this information is transmitted to the standby exchange via the common line interface circuits 19 and 29, and is always in the same state.
[0014]
FIG. 3 shows an example of a hardware / software interface bitmap in the operational exchange and standby exchange of the exchange system of the embodiment. “I” on the interface is information that allows the exchange to recognize whether it is currently active or standby. When there is a change in this part, the exchange recognizes that there has been a change in the active system / standby system and performs switching. In the figure, “j” is a point that is controlled by software when the switching is forcibly performed by a maintenance panel or the like. When “j” is controlled, the switching between the active system and the standby system is forcibly performed. Can do. At this time, the switching device 3 is also controlled.
[0015]
FIG. 4 shows a connection explanatory diagram when the exchange A is used as an active exchange and the exchange B is used as a standby exchange. When the exchange A is in a call state, the switching device 3 is in a direction to be connected to the LIN 17 and TRK 18 side of the exchange A, and a path is connected in the exchange A. The call state information is transmitted to the exchange B via the common line interface circuits 19 and 29 and stored in the memory 23.
[0016]
FIG. 5 is a connection explanatory diagram in the case where a switching operation occurs in the exchange A and a switching occurs in the exchange B. When the switching condition occurs, the switching device 3 is switched so as to be connected to the exchange B side in hardware, and the fact that the switching has occurred is reflected in the interface point. When the exchange B recognizes the switching, it controls the connection of the LIN 27 and the TRK 28, the lamp, and the like from the memory information. In the exchange A, initial setting control is performed when switching occurs. In addition, the switching can be provided with a manual switching means that enables switching by a manual method, and when the maintenance manager determines that the switching is necessary, the switching instruction from the maintenance panels 15 and 25 can be easily performed. It becomes possible.
[0017]
An example of an operation sequence in the case of switching to a standby switch when a failure occurs in the active switch and is switched will be described with reference to FIG.
S10l) The active switching system monitors the interface with a periodic program, and when the point is switched from the active system to the standby system, the process proceeds to step S102, and when switching does not occur, normal switching operation is continued. The periodic program is monitored with the highest level periodic program so that it can be immediately switched when a switching condition occurs.
S102) When switching occurs, in order to operate as a standby exchange, initial setting in the exchange is performed, and the process proceeds to step S103. Since it is not known when and when the next switching will occur, and when a failure occurs and becomes a standby switch, it is unclear whether the switch is in an absolutely stable state, so initial setting is required.
S103) A memory information transfer request is transmitted to the exchange which has become the active system, and the process proceeds to step S104. The exchange that has been initially set must acquire the memory status information from the exchange that has become the active system and be prepared for the next occurrence of switching, so a common line interface circuit must be installed for the exchange that has changed to the active system. To make a memory information transfer request.
S104) It is determined whether or not a memory information transmission start signal is received. If there is reception, the process proceeds to step S107, and if there is no reception, the process proceeds to step S105.
S105) It is determined whether or not a memory information end signal has been received. If there is reception, the process proceeds to step S109, and if not received, the process proceeds to step S106.
S106) It is determined whether the memory information reception timer is continued or expired. If it is continued, the process returns to step S104, and if it is expired, the process returns to step S103.
S107) The memory information is copied, and the process proceeds to step S108.
S108) A memory information reception response is transmitted, and the process returns to step S104.
S109) The memory copy is terminated, and the process proceeds to step S110.
S110) Operates as a standby exchange.
[0018]
Next, an example of a sequence when the standby switch is switched to the active switch by switching will be described with reference to FIG.
[0019]
S201) When the standby switch is monitoring the interface with a periodic program and the point (the “i” bit shown in FIG. 3) is switched from the standby system to the active system, the process proceeds to step S202, and when switching does not occur, Continues operation as a standby switch. The periodic program is monitored with the highest level periodic program so that it can be immediately switched when a switching condition occurs.
S202) The path connection lamp and the like are controlled based on the memory information received so far. This is control for ensuring that the state of the package or the like in the exchange is exactly the same, and it is possible to prevent the user from being affected at all. Also, if it is determined that the memory is indeterminate (for example, when switching occurs during signal transmission), the subsequent control cannot be performed normally, so the circuit is not switched and signal transmission is performed. After the process is completed, the circuit is initialized.
S203) It is determined whether or not the switching process has been completed for all the circuits. If not completed, the process returns to step S202. If completed, the process proceeds to step S204.
S204) Initial setting is performed, and a memory information transmission start message is transmitted in order to transmit the current connection information to the exchange that has become a standby system.
S205) It is checked whether a memory information request message has been received. If it has been received, the process proceeds to step S208, and if it has not been received, the process proceeds to step S206.
S206) It is checked whether or not a memory information transmission start response message has been received for the message previously transmitted in S205. If not received, the process proceeds to step S207. If received, the process proceeds to step S208. move on.
S207) The memory information transmission start response message reception monitoring timer is controlled. When the timer is continued, the process proceeds to step S205, and when the timer is expired, the process returns to step S204.
S208) The transmission of the memory information is started, and the process proceeds to step S209.
S209) Processing is performed to determine whether or not a memory information reception response message has been received. If received, the process proceeds to S2ll, and if not received, the process proceeds to S2lO.
S2lO) The memory information reception response monitoring timer is controlled. When the timer is continued, the process proceeds to S209, and when the timer is expired, the process returns to step S204.
S2ll) It is determined whether or not the transfer of the memory information is completed. If not completed, the process returns to step S208, and if completed, the process proceeds to step S212.
S212) The system is operating as an active exchange.
[0020]
When the switching is forcibly performed by a maintenance panel or the like, by controlling the “j” bit shown in FIG. 3, it is reflected that one bit is an active system or a standby system, and FIGS. The same processing as the switching control shown in FIG.
[0021]
【The invention's effect】
According to the present invention, when a failure occurs that hinders the operational exchange, it can be automatically switched to a standby exchange, and can be easily switched from a remote location, and being connected. It is possible to obtain a private branch exchange system that allows a call to be switched without any influence.
[Brief description of the drawings]
FIG. 1 is a configuration explanatory diagram of a private branch exchange system according to an embodiment.
FIG. 2 is an explanatory diagram of a line state management memory in the private branch exchange system according to the embodiment.
FIG. 3 is an explanatory diagram of a hardware / software interface in the private branch exchange system according to the embodiment.
FIG. 4 is a connection explanatory diagram when the private branch exchange system of the embodiment is an active exchange A.
FIG. 5 is an explanatory diagram of connections when the private branch exchange system in the embodiment is an active exchange B;
FIG. 6 is an explanatory diagram of a flowchart of switching control of the active exchange in the embodiment.
FIG. 7 is an explanatory diagram of a flowchart of switching control of the standby exchange in the embodiment.
[Explanation of symbols]
1, 2, Private branch exchanges 11, 21 Communication path switches 12, 22 Central processing units 13, 23 Storage devices 14, 24 Input / output control units 15, 25 Maintenance panels 16, 26 Fault occurrence transmission / reception units 17, 27 Line circuits 18, 28 Trunk circuits 19, 29 Common line interface circuit 3 Switching device 41 Fault signal line 42 Connection signal line

Claims (2)

Comprises a plurality of private telephone exchange for use as the active system switch or standby switch, when a failure in the active system switch occurs, the private branch exchange system switching to the standby exchange side,
A plurality of private branch exchange, a plurality of line circuits and state information for each trunk circuit of the active system switch are connected via a common line interface circuit for transmitting continuously to the standby switch, used as the standby exchange Sometimes, status information receiving means for receiving status information of the active switch via the common line interface circuit, fault notification means for notifying the standby switch when a fault occurs when used as the active switch, A switching means for performing switching connection to the standby exchange without disconnecting a call in progress when a failure occurrence during use as an active exchange is notified to the standby exchange by the failure notification means; Have
If the switching connection by the switching means occurs while the status information receiving means is receiving status information for each of the plurality of line circuits and trunk circuits, switching to the circuit related to the status information being received is performed. A private branch exchange system characterized in that it is not . When the switching by the switching means occurs, the initial setting is performed on the active exchange and is set as a standby exchange. After the initial setting by the initial setting means, the standby exchange becomes the standby exchange. state information receiving means of the exchange, the claim 1, characterized in that said switching connected switch and active system switch by the switching means, for receiving the state information of the operation system switching system via the common line interface circuit Private telephone exchange system as described .

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