JPS60130998A - Remote station automonous control transfer system - Google Patents

Abstract

PURPOSE:To avoid intermission of call processing by monitoring remote station control information during control of master station, forming and storing a call processing control state depending on the information and recombining the call processing connection based on the storage information at the transfer of remote station automonoous control. CONSTITUTION:When a subscriber telephone set SUB11-a makes call, call detection information is transmitted to a central controller CP25 via a control route. A remote station control information storage device INF17 gives detecting information in this case and the telephone set SUB11-1 makes the subscriber state to the calling state and it is stored in a subscriber memory. Then the INF17 leads in a channel in a digital interface circuit DTI13 to an identification circuit and stores sequentially a called subscriber number dialed from the telephone set SUB11-1 to the subscriber memory. At the transfer of remote station automonous control state due to transmission fault during talking, the call processing connection is recombined based on the storage information.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transition control system when a remote exchange shifts from a controlled state by a master exchange to a controlled state by an independent control device within the remote exchange. □ Conventionally, in remote exchanges that have adopted a method in which only the subscriber terminals within the master exchange are extended far away, when the master exchange is controlling the remote exchange, the time-division switch equipment in the master station is normally used for mutual call processing within the remote office. A communication path is formed through the . Furthermore, the remote station independent control device exists in a form separated from the control system of the remote station exchange during the control state, and is incorporated into the control system only when the autonomous control is transitioned. This is because by separating the independent control device with additional functional elements in the remote central office exchange system from the basic device, it is possible to construct a system with a small basic block structure and at low cost.

However, when the transmission path connecting the master exchange and the remote exchange encounters a failure and transitions to an independent control state, the remote exchange does not return to its initial setting state because the remote control information that is currently under control of the master exchange does not remain. However, restarting has the disadvantage that call processing is interrupted for inter-remote calls within the remote office as well as for calls to and from outside the remote office.

An object of the present invention is to provide an independent control transition system that eliminates the above problem by storing remote station control information that is under control of the master station and makes it possible to rescue call processing.

In order to achieve the above object, the remote station autonomous control transfer method according to the present invention usually uses a transmission path.

Only when the master exchange becomes unable to control the remote station controlled by the master exchange due to a failure in the transmission path, etc., an autonomous control device is incorporated into the control system of the remote station to control the remote station. In the remote station independent control system, a time-division exchange switch device for exchanging multiple call signals, a central control device, a subscriber interface concentrator for accommodating each subscriber, and a transmission line connected to the master exchange a first changeover switch inserted between the digital interface circuit and the subscriber interface line concentrator to selectively connect the subscriber interface line concentrator to either the digital interface circuit side or the time division exchange switching device side; A second switch that switches and connects the line to either the master exchange or the central controller, a memory that stores the status and control information for each subscriber line, and a memory that stores the idle/busy status of the call line. call memory, PB on the call line
It includes a remote station control information storage device consisting of a fault signal various service sound identification circuits and a control circuit for these circuits, and usually includes the above-mentioned @1. The second changeover switch is connected to the master exchange side, and the remote station control information that is sent and received (3) between the master exchange and the master exchange during control of the master exchange, and this control information can be used to control communication between remote stations, etc. Storing the call processing control state in the remote station control information storage device 17;
When the subscriber interface line concentrator is connected to the central control unit and the time division exchange switching device by switching the second changeover switch and shifts to autonomous control, autonomous control is performed based on the stored information in the remote station control information storage if. It is configured to configure the state.

According to the above configuration, even when switching to the independent control device, call processing for inter-remote calls will not be interrupted.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a remote station independent control system according to the present invention.

5ubll-a+' 11-b and 21 indicate subscriber telephones, which are connected to the remote station and the master station subscriber interface/concentrator L8W12, 22, respectively. Digital interface circuit DT113, 23
is connected to the transmission line between the remote exchange 8!1 and the master exchange 2, and transmits and receives call signals and control information. Further, the other end of the digital interface circuit DT113 is connected to the subscriber interface/line concentrator LSW12 via a changeover switch SW16-a. 'I'
DSW 24 is subscriber interface/concentrator L
SW 22 and digital interface circuit D
This is a time-division exchange switching device that is connected to the TI 23 and exchanges multiplexed call signals from the device.

The central control device CP 25 is connected to the time division switching device TDSW 24 of the master exchange 2 and the subscriber interface/concentrator H[LSW 22 via a control line, and exchanges information between the devices. Call processing control is performed while repeating transmission and reception.

Furthermore, CP25-D'l'I23-D is also applied to the subscriber interface/concentrator L8W12 in the remote station.
Call processing control is performed via the control route T113-8W16-b-L8W12.

The independent control device is a time division switching switch device TDSW14,
Central control unit, CP15. and a remote station control information storage device INF17. TD8W14 is a changeover switch after switching to remote station independent control SW 16-
atl-through subscriber circuit interface/concentrator L
This is a time-division conversion switch device connected to the SW 12 for inter-office communication. CP15 is a central control unit for autonomous control, and a digital interface circuit DT113
Shifts to independent control processing based on the transmission path failure detection information from the switch 8W16-b, and thereafter performs call processing control by transmitting and receiving information to and from the subscriber interface/concentrator L8W12 and the time division switch device TD8W14 via the changeover switch 8W16-b. .

5W16-a is a communication path changeover switch which normally connects the subscriber interface/concentrator L8W12 and the digital interface circuit DT113. In addition, when the remote station is in an independent state, the switch switches between the subscriber interface/concentrator LSW12 and the time division switching switch 'I.
' Connect D SW 14. 8W16-b is a changeover switch for control lines, and is usually used for subscriber interfaces.
The line concentrator 1L8W12 is connected to the digital interface circuit DT I 13, and when the remote station is in an independent state, the subscriber interface/line concentrator LSW12 is connected to the central control unit CP15. INF'17 connects the digital interface circuit DT113 to the subscriber interface.
It is a remote station control information storage device that is connected to the control line to the line concentrator LSW12 and also connected to the telephone line of the digital interface circuit DT113 to monitor multiple control information.

The device INF 17 is further connected to the central controller CP 25 and transfers the autonomous control transition call processing connection state configuration information to the central controller CP 25.

The operation of the remote station control information storage device I NF 17 will be described below, taking as an example the remote station interconnection from the subscriber telephone sub 11-a to the subscriber telephone 1y'k sub 11-b. Remote station control information storage device INF1
7 is a subscriber memory that stores the status and control information for each subscriber line, a call memory that stores the idle/busy status of the call line, a circuit for identifying various service tones of PB double signals on the call line, and control of these circuits. Consists of circuits, etc. When subscriber telephone tagub 11-8 makes a call, the call detection information is LA.
It is transmitted to the central controller cp25 via the control route W12-DT113-DTI23-CP25.

At that time, the remote station control information storage device INF 17
Based on the detected information, the subscriber state of the subscriber telephone sub 11-a is set as calling and stored in the subscriber memory.

Furthermore, based on the communication path blockage control information sent from the central control unit cp25 to the subscriber interface/concentrator L8W12, the communication line used by the subscriber interface/concentrator 5ub-11-a is written in the subscriber memory, and the information on the communication memory is The communication path is blocked. Next, the remote station control information storage device ■NF17 is the digital interface circuit DT.
The communication path in the sub 13 is connected to an identification circuit, and the called subscriber numbers dialed from the subscriber telephone sub 11-a are sequentially stored in the subscriber memory.

The central control unit CP25 also determines the called subscriber 5ubll-b by translating the called subscriber number.

The remote station control information storage device INF17 connects the time division exchange switch device TD8W24 to the subscriber telephone set SU.
By detecting the ringing tone to bll-B, the intra-office mutual calling state of subscriber telephone sub 11-a is stored in the subscriber memory of subscriber telephone sub 11-a.

Further, it is assumed that the subscriber memory of the subscriber telephone fisubll-b is being called by the paging signal transmission control information to the subscriber telephone fisubll-b. Central control unit CP25 for response signals and response signals from subscriber telephone 5ubll-b
Based on the communication path blocking control information from the subscriber telephone sub 11-b to the subscriber telephone sub 11-b, the communication line used by the subscriber telephone sub 11-b is written in the subscriber memory, and the communication path on the communication memory is blocked. Furthermore, subscriber telephone 81sub 11-
a and subscriber telephone 5ubll-1) are changed to call status.

When the call ends, each memory is cleared by each subscriber's disconnection signal and call path release control information.

Now, when the remote station enters the independent control state due to a transmission path failure during the above-mentioned call state, the central control unit CPj5 records the call state of the initiating side using the subscriber memory of the subscriber telephone sub 11-a, The subscriber's phone call state is regenerated using the subscriber's memory, and the subscriber's phone 5W16-
It controls the subscriber interface and line concentrator L8W12 via b. Further, by controlling the time division exchange switch device TD8W14 using the call path recovery information according to the call memory, the mutual path between the subscriber telephone set 5ubll-a and the subscriber telephone set 5ubll-b is completely constructed.

As described in detail above, the present invention monitors the remote station control information under master station control, creates and stores the call processing control state based on this information, and, based on the stored information when the remote station is transferred to independent control, By re-establishing the call processing connection, it is possible to realize a remote station autonomous control transition method that does not involve interruption of call processing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a remote station independent control system according to the present invention. 1...Remote station exchange 2...Master station exchange 11-
a, 11-b, 21-Subscriber telephone (8UB)
12, 22...Subscriber interface/FI line 1H
ft (L8W) 13, 23...Digital interface circuit (D
TI) 14, 24...Time division switching device (TDSV)
V) 15, 25...Central AT device (CP) 16-
a, 16-b---selector switch (SW) 17...
・Remote station control information storage device (INF) patent applicant
NEC Corporation Representative Patent Attorney Hisashi Inoro

Claims (1)

[Claims] Normally, when a remote station that is normally controlled by a master exchange via a transmission line is unable to be controlled by the master exchange due to a failure in the transmission line, 1) the control system within the remote station is In a remote station independent control system in which control is performed by incorporating independent secondary devices, a time division exchange switching device for exchanging multiple call signals, a central control device, a subscriber interface concentrator for accommodating each subscriber, and a master station are used. It is inserted between the digital interface line connected to the transmission line to the exchange, and the subscriber interface 7:c-1 is connected to either the digital interface circuit side or the time-sharing switching device side. a first changeover switch for switching connection;
a second changeover switch for selectively connecting the control line of the subscriber interface line concentrator to either the master exchange side or the central control unit side; a memory for storing status and control information for each subscriber line; A remote station consisting of a communication memory that stores empty/base status, a PI3 signal on the communication line, identification circuits for various service sounds, and a control circuit for these circuits.
The first and second changeover switches are usually connected to the master station converter side, and the remote station transmits and receives data to and from the master exchange while the master exchange is being controlled. The control information and the call processing control i11 state such as inter-remote communication within the remote station based on the control information are stored in the remote station control information storage device, and the first . When the subscriber interface line concentrator is connected to the central control unit and the time-division exchange switching device by switching the second changeover switch and transitions to independent control, the local station internal control is performed based on the information stored in the remote station control information storage device. A remote station independent control transition method characterized by being configured to configure a call state.