JPH02105698A - Emergency call processing system for subscriber concentrator - Google Patents

Abstract

PURPOSE:To constitute the title system so that a specific incoming call from all subscribers incorporated in the subscriber concentrator can be processed by changing a comparatively simple software, even in the case of a state that a control from an exchange cannot be executed partially by utilizing a lead-in wire used for a circuit test, etc., in general. CONSTITUTION:The title system is constituted of a switchboard 51 of an exchange 50, and a subscriber concentrator 10 which incorporates subscribers 3, 4 and connected to the switchboard 51 through digital multiplex circuits 100, 200. The subscriber concentrator 10 is constituted of a subscriber concentrating stage 20 and 30, an emergency call lead-in wire 1 and an emergency call processor 40. When a fault is generated in the digital multiplex circuit 200, the subscriber concentrating state 30 is connected to the emergency call processor 40. On the other hand, the subscriber concentrating stage 20 is connected to the switchboard 51 through the digital multiplex line 100. When the subscriber 3 makes an emergency call in such a state, the subscriber 3 is connected to an incoming destination of the corresponding emergency call through the subscriber concentrating stage 20, the emergency lead-in wire 1 and the subscriber concentrating stage 30 by a controller of the switchboard 51, and an incoming is executed from the subscriber 3 to the subscriber 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an emergency call processing system for a subscriber concentrator connected to a switching center via a digital multiplex line.

[Conventional technology]

A subscriber line concentrator is realized by bringing a plurality of subscriber line concentrators of an exchange installed in a switching center close to a group of subscribers. Each subscriber concentration stage performs call processing for the subscribers it accommodates under the control of the exchange of the switching center. A subscriber concentrator equipped with such a subscriber concentrator stage is capable of disabling subscriber concentrators when the corresponding subscriber concentrator stage is no longer controlled by the exchange due to some failure in the digital multiplex line connecting it to the exchange. It has an emergency call processing device that processes calls between subscribers accommodated in the concentrator stage.

In such subscriber concentrators, when some of the concentrators cannot be controlled by the switching center, the call processing is switched to the emergency call processor, which handles call processing between the subscribers accommodated in the concentrator stage. . However, since each concentrator stage in a subscriber concentrator is independent, a subscriber accommodated in a concentrator stage that cannot be controlled cannot talk to a subscriber accommodated in a normal concentrator stage. For this reason, emergency calls such as police and fire services cannot be handled. Conventional emergency call processing methods for subscriber line concentrators to process such calls are to have a separate line in each concentrator stage for emergency calls such as police and fire departments, or to have a separate line in the emergency call processing unit. They set up a separate line that only works in such situations.

[Problem to be solved by the invention]

In the conventional emergency call processing method of the subscriber line concentrator described above, a line and telephone set for each emergency call is provided for each concentrator stage, or a line for emergency calls is provided within the emergency call processing device separately from the line for normal calls. However, the disadvantage is that many lines must be installed and many telephones must be installed.

It is an object of the present invention to eliminate such drawbacks and to provide an emergency call processing system for a subscriber concentrator that can relatively easily handle emergency calls when the subscriber concentrator stage of the subscriber concentrator is not under the control of the switching center. The objective is to provide a call processing method.

[Means to solve the problem]

The present invention provides a subscriber concentration stage that is provided in a subscriber concentrator connected to an exchange via a digital multiplex line, accommodates subscribers via a subscriber circuit, and is normally controlled by the exchange; 4. Control of emergency call processing of subscriber concentration stages that are connected to each subscriber concentration stage and are not subject to the control of the switching center.
In the emergency call processing method of a subscriber concentrator equipped with an emergency call processing device that performs a lead-in means for pulling in the emergency call transmitted to the one subscriber concentration stage; a drop-in line for transmitting the emergency call drawn by the lead-in means; and a lead-in line provided in the other subscriber concentration stage, The subscriber circuit receives emergency calls transmitted through the line.

〔Example〕

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

FIG. 1 is a configuration diagram showing an embodiment of the present invention. This emergency call processing method of the subscriber line concentrator is based on the subscriber line concentrator 10 which accommodates the exchange 51 of the exchange 50 and the subscribers 3 and 4 and is connected to the exchange 51 via digital multiplex lines 100.200. It consists of

Further, the subscriber line concentrator 10 includes a digital multiplex line 1
A subscriber concentration stage 20 connected to the digital multiplex line 200 and accommodating the subscriber 3; a subscriber concentration stage 30 connected to the digital multiplex line 200 and accommodating the subscriber 4;
0 and 30, and an emergency call processing device 40 connected to the subscriber concentration stages 20 and 30.
It consists of

In addition, in this embodiment, the subscriber 4, for example, dials the number "
119" is the destination for emergency calls.

In the emergency call processing method of the subscriber line concentrator with such a configuration, the subscriber line concentrator 10 brings some of the subscriber line concentration stages of the exchange 51 to the vicinity of the subscriber group and performs subscription using digital multiplex lines. The exchange center 50 accommodates people. That is, in this embodiment, the subscriber concentrator stages 20 and 30 of the exchange 51 are brought out near the subscribers 3 and 4.

A detailed configuration diagram of this subscriber line concentrator 10 is shown in FIG.

As shown in FIG. 2, the subscriber line concentrator stage 20 of the subscriber line concentrator 10 includes an interface 22, a multiplexing/demultiplexing circuit 23, a transmitting/receiving circuit 24, a dropper/inserter 25, a control section 21, It includes a selector 26, a line concentration switch 27, a subscriber circuit 28 consisting of a basic section 281 and a pull-in relay 28□, and a selection relay part 29 consisting of relays 29A and 29B.

The multiplexing/demultiplexing circuit 23 of such a subscriber concentrator stage 20 is for a digital multiplex line 100 connected via an interface 22.

The selector 26 connects the multiplex/separate circuit 23 and the line concentration switch 2.
7, a failure occurs in the digital multiplex line 100, and the control unit 21 switches the communication path when receiving service from the emergency call processing device 40.

The control unit 21 detects a call from the subscriber 3, counts the dialed digits from the subscriber 3, and controls the control unit 41 of the control unit of the switching center 50 or the emergency call processing unit 40, which is a higher control unit.
Report to.

The transmitting/receiving circuit 24 is connected between the multiplexing/demultiplexing circuit 23 and the control unit 21 and functions as a transmitting/receiving circuit for transmitting and receiving control information with the exchange 50 using the control channel on the digital multiplex line 100.

The dropper/inserter 25 is connected to the control unit 21 and extracts and inserts control information with the control unit 41 of the emergency call processing device 400.

The basic part 281 of the addition line circuit 28 is the line concentration switch 27
It performs line monitoring, battery supply, 2-wire and 4-wire conversion, A/D conversion, ringing signal transmission, etc.

The pull-in relay 28B is connected between the subscriber 3 accommodated by the subscriber circuit 28 and the basic part 28A, and draws the 11 addition batt 101 into the emergency call pull-in batt 1. This emergency call drop-in line 1 is generally used for line tests and the like.

The selection relay 29 is connected between one end of the emergency call drop-in line 1 and the pull-in relay 28□ of the subscriber circuit 28, and selects the emergency call drop-in line. In addition, selection relay 2
The concave wire tester 2 is connected to the relay part 29A of the relay 9.

The subscriber line concentration stage 30 includes an interface 32 similar to the subscriber line concentration stage 20, a multiplexing/demultiplexing circuit 33, and a transmitting/receiving circuit 3.
4, the dropper/inserter 35, the control section 31, the selector 36, the line concentration switch 37, and the basic section 38B.
, and a subscriber circuit 28 consisting of a pull-in relay 38B2. Further, the subscriber tR line membrane 0 includes a subscriber circuit 38A accommodated in the line concentration switch 37 and to which the other end of the emergency call drop-in line 1 is connected.

This subscriber circuit 38A is composed of a basic section 38Δ1 and a pull-in relay 38A2. This pull-in relay 38A2 is connected to the subscriber circuit 38 that accommodates the subscriber 4.
It is connected to the pull-in relay 38B2 of B.

The emergency call processing device 40 is configured to accommodate a corresponding subscriber concentration stage when the corresponding subscriber concentration stage cannot receive control from the exchange 51 due to some failure in the digital multiplex lines 100 to 200 connected to the switching center 50. This service handles calls between subscribers. This emergency call processing device 40 is P
Service trunk 4 such as B signal receiver and tone generator
5, a multiplexing/demultiplexing circuit 44 of the service trunk 45,
A multiplexing/demultiplexing circuit 44 and a multiplexing/demultiplexing circuit 43 connected to the dropper/inserters 25 to 35 of the subscriber concentration stages 20 to 30, a switching network 42 connected to the multiplexing/demultiplexing circuit 43, and a switching network. 42, and a control section 41 located higher than the control sections 21 to 31 of the subscriber concentration stages 20 to 30.

Next, the operation of this embodiment will be explained.

When all the subscriber line concentrators 20 to 30 are under the control of the control device included in the exchange 51 of the exchange 50, in the subscriber concentrator 20, the subscriber line 101 of the subscriber 3 is connected to the subscriber circuit 28. It is connected to the line concentration switch 27 via the lead-in relay 28□ and the basic part 28°. Terminal 27A of line switch 27 is connected to selector 26. Multiplex/separate circuit 23. Interface 22. Digital multiplex line 10
0 to the exchange 51 of the exchange 50. Similarly, at the subscriber concentration stage 30, the subscriber 4
The subscriber line is connected to the lead-in relay 38 of the subscriber circuit 38B.
B,, via the basic section 38B, the line concentration switch 3
Connected to 7. The terminal 37A of the line concentration switch 37 is connected to the selector 36. Multiplex/separate circuit 33. interface 32
．． It is connected to an exchange 51 of an exchange 50 via a digital multiplex line 200.

In such a state, a call from subscriber 3 to subscriber 4 whose number is "119" is detected by the controller 21 of the concentrator 20, and a report regarding this detection is sent to the upper level by the control information transmitting/receiving circuit 24. The exchange 51 of the exchange 50, which is a device
is sent to the control device. When this report is recognized, the controller controls the concentrator switch to seize and connect one of the free channels and instructs the controller 21 of the concentrator stage 20 to receive the dialed digits; Controls the switching network to connect dial tones that facilitate dialing. The dialed digit "119" from the subscriber 3 is counted and reported by the controller 21 of the line concentrator 20.

As a result, the destination of the call is determined, the communication path to the subscriber 4 is acquired, and the controller 31 of the corresponding concentrator 30 is instructed to send a ringing signal. In this way, the emergency call from subscriber 3 is sent to subscriber 4, which is the destination of the "119" call.

Next, when all the subscriber line concentration stages 20 to 30 are under the control of the control unit 41 of the emergency call processing device 40, in the subscriber concentration stage 20, the subscriber line 101 of the subscriber 3 is connected to the subscriber circuit. It is connected to the line concentration switch 27 via the lead-in relay 28□ of 28 and the basic part 28. Concentration switch 2
7 terminal 27A is connected to selector 26.7. Dronper/inserter 25. It is connected to the switching network 42 of the emergency call processing device 41 via the multiplexing/demultiplexing circuit 43 . Also in the subscriber concentration stage 30, the terminal 37 of the concentration switch 37
A is selector 36. Dronper/Incircu 35. via the multiplexing/demultiplexing circuit 43 - the switching network 42;
connected to. Then, the emergency call from subscriber 3 is processed in the same way as the above-described process under the control of the control device of exchange 51, and is sent to subscriber 4, which is the destination of the call number "119".

Next, when a failure occurs in the digital multiplex line 200,
A subscriber concentrator stage 30 is connected to an emergency call processing device 40 .

That is, the terminal 37A of the line concentration switch 37 of the subscriber 2 line stage 30 is connected to the selector 36. Dropper/inserter 3
5. The emergency call processing device 40 is connected to a switching network 42 via a multiplexing/demultiplexing circuit 43 . On the other hand, the terminal 27A of the line concentration switch 27 of the subscriber line concentration stage 20 is connected to the selector 26. Demultiplexing circuit 23. Interface 22. It is connected to an exchange 51 of an exchange 50 via a digital multiplex VA 100.

In this situation, when subscriber 3 makes an emergency call,
The usage status of the emergency call drop-in line 1 is checked by a higher-level control device that controls the subscriber concentration stage 20 accommodating the subscriber 3, that is, the control device of the exchange 51 of the exchange 50. When the emergency call drop-in line 1 is vacant, the pull-in relay 28□ of the subscriber circuit 28 and the relay part 29B of the selection relay 29 are controlled, so that the subscriber 3 can , the relay part 29B, and the emergency lead-in line 1 to the subscriber circuit 3 of the subscriber concentration stage 30.
Connected to 8A. The highest level control unit processes the subscriber circuit 38A to connect the corresponding emergency call destination as a hotline service, and the call is received from subscriber 3 to subscriber 4. When the end of a call is detected, this is done by reporting it via the ;1 control section of the line concentrator connected to the switching center between the upper level devices and restoring the pull-in relay and selection relay.

In this way, according to this embodiment, by using a drop-in line that is generally used for line testing, etc., when a part of the line cannot be controlled from the switching center, the subscriber line concentrator accommodates the Specific incoming calls from all subscribers can be handled with relatively simple software changes.

〔Effect of the invention〕

As explained above, according to the present invention, in a subscriber concentrator, some of the subscriber concentrator stages are unable to obtain control from the exchange due to a failure in the digital multiplex line connecting the exchange and the subscriber concentrator. In such cases, call processing can be performed between the accommodated subscribers to prevent them from becoming isolated.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
2 is a detailed configuration diagram of the subscriber line concentrator shown in FIG. 1. FIG. 1...Emergency call drop-in line 2...Line tester 3.4...Subscriber 10...Subscriber line concentrator 20, 30...Subscriber line concentration stage 2L 31. . . . Control units 22, 32 .
...Selector 27, 37...Concentrator switch 28, 38A, 38B...Subscriber circuit 28□, 38
A1.38B, ... Basic part 28□, 38A2.38
8Z...Retracting 29...Selection relay 29A, 29B...Relay part 40...Emergency call processing device 41...Control unit 42...Switching network 43, 44...Multiplexing/demultiplexing circuit 45...Service trunk 50...Switching center 51...Switching system relay

Claims (1)

[Claims] (1) A subscriber concentration stage, which is provided in a subscriber concentrator connected to an exchange via a digital multiplex circuit, accommodates subscribers via a subscriber circuit, and is normally controlled by the exchange; In an emergency call processing system for a subscriber concentrator, which is connected to a subscriber concentrator stage and is equipped with an emergency call processing device that controls emergency call processing in a subscriber concentrator stage that cannot be controlled by an exchange, in the case of a failure, when an emergency call occurs across a normal subscriber concentration stage and a failed subscriber concentration stage, a pull-in means for pulling the emergency call transmitted to said one subscriber concentration stage; and said pull-in means. A subscriber circuit comprising: a drop-in line for transmitting an emergency call drawn in by the user; and a subscriber circuit provided at the other subscriber concentration stage and receiving the emergency call transmitted via the drop-in line. Emergency call processing method for line concentrator.