JPS616996A - Subscriber circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a subscriber circuit for accommodating customer equipment such as digital exchanges. In particular, by providing the subscriber circuit with an interface function and a processing function at the signal link level in addition to the hypothetical and physical interface functions, it is possible to process everything from detecting a call to receiving and storing selected signals, and sending out a paging signal. By autonomously performing subscriber-related processing such as detecting the called party's response and processing up to stopping the ringing signal in a closed manner within the subscriber circuit, the amount of programs and processing of the processing device can be reduced. The present invention relates to a subscriber circuit that enables easy C2 connection of household equipment with different signal procedures without changing the program of the processing device.

2. Description of the Related Art The subscriber circuit of a conventional analog switching system was equipped with the minimum necessary functions such as monitoring the subscriber's status, and other functions were provided in common equipment. In digital exchanges, the call path switch is configured with memory and non-disputable circuits, so it is necessary to provide functions such as sending out a ringing signal and supplying call current on the subscriber line side of the switch.
Crosstalk current supply.

O: Overvoltage protection, R: Calling signal transmission, S: Monitoring.

It is equipped with electrical and physical level subscriber line interface functions called C: code decoding, H: 2-wire 4-wire conversion, T: testing).

Figure 2 (: Shows an example of the configuration of a conventional digital switch.
For example, Nippon Telegraph and Telephone Public Corporation Telecommunications Research Institute Research and Practical Application Report Vol. 51 No. 11 (1982-II)
In Figure 2, 1 is a telephone, 2 is a subscriber circuit, 6 is a line concentrator, and 4 is a telephone set.
5 is a dial pulse receiver (DPR), 5 is a multi-frequency signal receiver (PBE), and 6 is a dial tone (DT).

A signaling device consisting of a signal sending circuit that sends out a busy tone (BT), 7 is a communication path switch, 8 is a processing device, 9 is a main storage device (main memory), 10 is a secondary storage device (file memory), 11 is subscriber line scanning circuit (LSCN), 12
is the trunk scanning circuit (TSCN). The operation will be explained below.

When the processing device 8 detects a call from a subscriber by performing timing processing on the DC monitoring information sent from the subscriber circuit 2, the processing device 8 detects a call from the subscriber by performing timing processing on the DC monitoring information sent from the subscriber circuit 2. The subscriber data is stored in the main memory 9.
It analyzes the call, determines the type of outgoing dial tone and identifies whether it is a PR subscriber or a DP subscriber, selects each vacant PBE5°DPR4, and connects the subscriber circuit to the signal receiver. After completing the path setting, the signaling device 6 sends out a dial tone, and the PBE 5 and DPR 4 receive the selection signal sent by the subscriber. The processing device 8
After receiving the first digit, it issues a beep stop command to the signaling device B, while determining the number of received digits for selection No. 16 through pre-translation processing, and receives and accumulates the necessary selection signals.

When a busy tone is to be sent to the calling subscriber when the calling subscriber is dialing or a called party is talking, the signaling device 6 is selected and connected to the path to send the busy tone to the subscriber.

On the other hand, when a call is received, a pre-trip test is first performed to determine if there is a fault such as a ground fault or cross-touch on the subscriber line, and if the call is normal, a ringing signal is sent out, and when a response from the called party is detected, the sending of the ringing signal is stopped. The called party paging process t is performed by the processing device controlling the subscriber circuit.

In the subscriber line monitoring No. 15 process, the subscriber circuit 2 converts the on/off status of the subscriber line loop into signal bits, the signal bits are collected in the LSCNll, TSCN12, and the processing device 8 periodically outputs the subscriber line loop on/off to the LSCNll, TSCN12. TSCN12 ′jk
By scanning, transitions in subscriber status are detected. Here, call monitoring is performed using LSCNll without going through the communication path.
Monitoring of disconnections, responses, etc. is performed at T SCN 12 after line concentration.

Problems to be Solved by the Invention In the conventional system, processing is performed by successively connecting and switching several common circuits that realize functions such as called party paging processing and subscriber line monitoring signal processing. Since many procedures are required for management and conflict processing, the control method becomes complicated, and the amount of programs and processing amount of the processing device increases. Furthermore, since the processing device performs node-oriented control in each mode of the subscriber circuit, there is a problem in that the dynamic processing amount of the processing device increases.

Furthermore, each time a new in-home device was installed and the signal procedure changed, it was necessary to review the program of the processing device and add or change the program. Therefore, there is a problem in that it takes a lot of time to verify the program.

Further, a subscriber circuit having a transmission register circuit which receives a selection signal from a telephone and transmits a dial tone or a busy tone to the subscriber is disclosed in Japanese Patent Application No. 56-129058 (Japanese Patent Application Laid-Open No. 56-129058).
8-30295) "Subscriber Circuit", etc., but this has the following problems.

■ Instead of counting dial pulse information using a program in a processing device, the main feature is that it is counted by providing a selection signal counting circuit for the subscriber.If the selection signal is a dial pulse (DP), the subscriber Although the selection signal can be received within the circuit, the same problem as above occurs in the case of a multi-frequency code (PB).

■ The counting process of the selection signal is performed within the subscriber circuit, but the pre-translation process for determining the number of received digits is performed in the processing device, so if there are many types of received digit numbers and it cannot be determined unambiguously,
In order to determine this, much processing is still required for transmitting and receiving information between the subscriber circuit and the central processing unit.

■ The signal source that generates the dial tone 2 busy tone is drawn into the subscriber circuit using a signal line, and the signal is sent out by controlling the signal line on/off, so the wiring between the signal source and the subscriber circuit is Is required.

Means for Solving the Problems The first invention of the present application provides communication current supply (B), overvoltage protection (O), ringing signal transmission (R), subscriber status monitoring (S),
Analog-digital conversion (C), 2-wire 4-wire conversion (
H) In the subscriber circuit of a digital exchange having a subscriber line interface function including each function of test (T), the subscriber line status signal is stored in the subscriber circuit and timing processing is performed to initiate a call. The second invention of the present application stores the subscriber line state signal of the first invention of the present application in the subscriber circuit, with the configuration having a function of detecting the transition of the subscriber state of response, hooking, and disconnection, A function that detects the transition of subscriber states such as calling, answering, hooking, and disconnecting by performing timing processing, and an audible signal that sends an audible tone of one call tone to the in-home equipment via the subscriber line. transmission function, dial pulse sent from in-house equipment, function to receive multi-frequency signal selection signals, call restriction identification, call analysis processing,
Pre-translation processing, selection signal reception and storage processing functions, and when a call arrives, it determines whether or not there is a line fault such as a ground fault or cross contact based on the incoming call command from the processing device, and then sends out a calling signal, and when it detects a response from the called party, it autonomously This subscriber circuit is characterized by a configuration that includes a function to stop ringing signals.

Function The present invention provides the subscriber circuit with an interface function and a processing function at the signal link level in addition to the electrical and physical interface functions. processing, detection of the called party's response from the sending device of the paging signal, processing up to the termination of the paging signal, etc. are carried out autonomously within the subscriber circuit in a closed manner, reducing the total amount of programming and processing for the processing device. , it is possible to easily connect all the processing devices of household equipment with different signal procedures without changing the programs.

Embodiment FIG. 1 shows an embodiment of the present invention. In the figure, 1 is a telephone;
21 is the BOR8CHT function unit (B: communication magnetic current supply, O2 overvoltage protection, R: calling signal transmission, S: DC loop monitoring,
2 is a subscriber circuit, 24 is a control circuit, and 25 is a subscriber status storage section.

FIG. 3 shows an example of a digital exchange constructed using the first embodiment shown in FIG. The same reference numerals as in FIG. 2 indicate the same parts. The operation will be explained below.

The subscriber state storage unit 25 stores subscriber states and state transition information for transitioning between subscriber states.

The subscriber state storage unit 25 is "empty" in the initial state.
is set in the state. When a subscriber makes a call, the EOR
8CRT function section 21 detects that the DC loop is turned on.

When the control circuit 24 detects all the loop-on information, it reads the status of the subscriber status storage unit 25, and if it is in the "1 vacant" state, it starts timing processing, and after detecting the on-state for a certain period of time, it starts the "call originating" state. ” and the subscriber status storage unit 25
1"Receiving selection signal" is stored while transmitting a selection signal reception request to the processing device 8. When a subscriber goes on-hook while receiving a selection signal, if the control circuit 24 similarly detects an off state for a certain period of time or more, it is assumed that the subscriber has abandoned the service midway and the "vacant" state is written in the subscriber state storage unit 25. Requests subscriber release processing from the processor.

Similarly, by performing timing processing based on subscriber DC loop information and accumulating subscriber status, it is possible to detect transitions in subscriber status such as call origination, response, hooking, and disconnection. .

Fig. 4 shows a second embodiment of the present invention, and Fig. 5 shows an example of a digital exchange constructed using the second embodiment of Fig. 4, and the same reference numerals as in Fig. 2 indicate the same parts. . In Figure 4,
22 HaBOR8CHT i i Pulls in both the DC loop monitoring signal and the digitized multi-frequency signal from the section 21, and generates a selection signal for either the multi-frequency signal (PB) or the dial pulse (DP) by delaying the digital signal and performing four arithmetic operations. 26 is a selection signal receiver that also has the function of performing numeric identification, 26 is a dial tone (DT), a busy tone (BT),
A signal sending circuit which generates a ringing signal (RBT) etc. as a digital signal, 24 a control circuit, 25 a subscriber status storage section, 26 a call restriction identification, call analysis processing, pre-translation processing 1
This is a storage circuit that stores information and programs necessary to implement subscriber line interface functions such as selection signal reception processing.

An example of the operation is shown in FIG. 6, and the operation will be explained below.

When a subscriber makes a call, the DC loop monitoring circuit of the BOR8CHT function unit 21 detects a change in the DC loop.

When the control M1 circuit 24 detects the loop-on information, it reads the state of the subscriber state storage unit 25, and if it is in the "vacant" state, it starts timing processing, and after detecting the on-state for a certain period of time, it starts the "call originating" state. '', and autonomously determines whether or not outgoing calls are being restricted based on the information in the storage circuit 26. If outgoing calls are being restricted, the signal sending circuit 26 is connected to send out a live call to the subscriber.

If calling is not restricted, the subscriber status storage unit 2512
The state of "reception of selection signal" is stored, and autonomous ζ2 call analysis processing is performed based on the subscriber information in the storage circuit 26 to identify the sending DT type, PB/DP subscriber, etc. Then, the selection signal receiver 22 is connected, and the signal sending circuit 2
6 to send out DT to the subscriber.

When the subscriber hears the DT, he sends out a selection signal consisting of a dial pulse or a multi-frequency signal, which is received by the selection signal receiver 22 and transferred to the control circuit 24 digit by digit.

When the control circuit 24 receives the first digit, it starts pre-translation processing based on the information in the storage circuit 26, sends a DT stop command to the signal sending circuit 23, and also inputs the number of received digits and dial reception type (special number). call, local call, long distance call, etc.).

After receiving the final number, a selection signal is sent to the processing device 8.
Sends outgoing information such as number of received digits dialed and type of reception. In the case of subscriber abandonment or incorrect dialing, this is autonomously determined, and the signal sending circuit 26 is connected to send ETq to the subscriber.

The processing device 8 analyzes the outgoing service based on the outgoing information sent from the subscriber circuit 2, determines whether it is an outgoing connection or an in-office connection, selects a route in the case of an outgoing connection, and establishes an in-office connection. In this case, the terminating subscriber circuit is selected by terminating service analysis.

Here, we will describe the operation of the subscriber circuit on the destination side, taking an example of internal connection.

The processing unit 8 identifies whether the terminating subscriber circuit is blocked and sends an ET to the originating subscriber circuit if the terminating subscriber circuit is blocked.
Send a send command. If the destination subscriber circuit is idle, it sends a paging period command to the originating subscriber circuit, and the originating subscriber disconnects the selection signal receiver 22 to complete the reception operation and eliminates quasi-ringing and echoes. Preparations for the call, such as inserting a pad to prevent this, are made, and the subscriber state storage unit 25 is switched to the "Called Party Calling" state.

The processing device 8 sends a call waiting command to the originating subscriber circuit and an incoming call command to the terminating subscriber circuit, thereby connecting the path between the originating subscriber circuit and the terminating subscriber circuit. When the destination subscriber circuit receives the incoming call command, it stores the subscriber status storage unit 2.
5 is rewritten from [Empty J] to "Called party is ringing", a preset test is carried out autonomously within the subscriber's circuit to determine whether there is a line fault such as a ground fault or cross contact, and when a line fault is detected, the processing device 8 to notify. If normal, insert a pad and send a ringing signal (16Hz) to the called party, connect the signal output path 23 to the highway, and send a ring back tone to the calling party. do. When it detects a response from the called party, it autonomously stops the ringing signal, sends a ringing stop command to the signal sending circuit 26, disconnects the caller, connects the subscriber line and the highway, and then sends a response to the processing device 8. Along with requesting processing, the subscriber status storage unit 25
Switch to "call" state.

When the processing device 8 receives the response processing request 6, it sends a reverse switching command to the originating subscriber circuit and starts billing processing.

When the subscriber circuit on the calling side receives the communication switching command, it switches to reverse power supply, switches the subscriber state storage unit 25 to the "talk" state, and starts a call.

Here, we have described a method for sending a ring tone to a calling subscriber from the called subscriber circuit, but as before, the ring sending circuit is provided as a common device, and the path between the calling subscriber circuit and the ring sending circuit is It is also possible to send out a ring tone by making a connection.

In this case, the connection of the path between the calling subscriber circuit and the terminating subscriber circuit will be performed during response processing after detecting the called party's response. In this case, the connection function between the calling signal sending circuit and the highway becomes unnecessary.

During a call, the originating subscriber circuit and the terminating subscriber circuit monitor the status of the subscriber line. Assume that the call has now ended and the calling subscriber goes on-hook. When the originating subscriber circuit detects that the DC loop is off, it starts timing processing, and when it detects an off state for a certain period of time or more, it considers it to be 1 disconnection and requests the processing device 8 to terminate the call.

When the processing device 8 receives the call termination processing request, it sends a release processing command to the calling/terminating subscriber circuit, and also performs call termination processing such as path release processing 1 billing processing to completely release the above call connection. . When the originating and receiving subscriber circuit receives the release processing command, it shifts to the call monitoring mode.

Although the case of a subscriber circuit for analog telephones has been explained here, a subscriber circuit is provided to support subscriber line signal systems such as digital terminals and broadband terminals, and processes that depend on the subscriber line interface and detailed node control are required. By executing processing within each subscriber circuit and using macro commands to send and receive commands between the processing device and each subscriber circuit, it is possible to perform various types of call control using the same processing device. .

Also, although not shown in the diagram, by providing separate trunk line interface control circuits for the trunk lines between stations and installing them at positions corresponding to the subscriber circuits, exchange connections can also be made for the trunk lines. I can do it.

FIG. 7 shows the effect of reducing the number of dynamic steps of the processing device according to this embodiment.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various configurations are possible.

As described in detail, the first invention of the present application can centralize the monitoring position of subscriber status by providing the subscriber circuit with the function of detecting the transition of subscriber status. In other words, conventionally, due to differences in real-time conditions, there has been a subscriber line scanning circuit (LSCAN) for call monitoring, which has a long scanning cycle, and a trunk scanning circuit (TSCAN), which has a short scanning cycle, for monitoring response, disconnection, and calling.
Previously, two scanning circuits (C, 4#) were provided to monitor subscriber status, but the present invention has the advantage that it can be implemented with one type of scanning circuit by monitoring each subscriber. Furthermore, since it is not necessary to perform all group processing, control of the scanning circuit becomes simple.

The second invention further provides the first invention with the memory necessary for connecting the sound source and the receiver by providing the subscriber circuit with a signal sending function and a signal receiving function, which were conventionally realized by changing the connection of common equipment. Management and path connections are no longer required.

In addition, by performing selection No. 43 reception processing with strict real-time conditions in the subscriber circuit, the execution management of the central processing unit can be simplified. Furthermore, by implementing detailed processing that depends on the signaling method field, such as call restriction identification, call analysis processing, pre-translation processing, selection signal reception processing, and called party paging processing, within the subscriber circuit, The central processing unit can control subscriber circuitry with logic level instructions. Further, common control between the digital subscriber circuit that implements the digital subscriber line signaling system and the current analog subscriber circuit can be easily realized.

As described above, the present invention provides a subscriber circuit that performs processing dependent on the subscriber interface in a closed manner and autonomously within all subscriber circuits, thereby significantly reducing the amount of programming and processing of the processing device. be.

[Brief explanation of the drawing]

FIG. 1 shows a first embodiment of the present invention, FIG. 2 shows an example of the configuration of a conventional digital switch, FIG. 3 shows an example of a digital switch constructed using the first embodiment of the present invention, and FIG. shows the second embodiment of the present invention, FIG. 5 shows an example of a digital exchange constructed using the second embodiment of the present invention, FIG. 6 shows an operation diagram of the second embodiment, and FIG. FIG. 7 is a diagram showing the effect of reducing the number of dynamic steps of the processing device when using the second embodiment. DESCRIPTION OF SYMBOLS 1...Telephone, 2...Subscriber circuit, 6...Line concentrator, 4...Dial pulse receiver (DPR), 5...
・Multi-frequency signal receiver (PBR), 6...Signal device consisting of a signal sending circuit, 7...Communication path switch, 8...
Central processing unit, 9... Main storage device, 10... Secondary storage device, 11... Subscriber line scanning circuit (L; 5CN),
12... Trunk scanning circuit (TSCN), 21...
BOEEiCHT functional unit, 22... selection signal receiver,
26... Signal sending circuit, 24... Control circuit, 25.
...Subscriber status storage unit, 26...Storage circuit patent applicant Nippon Telegraph and Telephone Public Corporation agent Patent attorney Gobe Tamamushi (2 others) Figure 1

Claims (2)

[Claims] (1) Call current supply (B), overvoltage protection (O), ringing signal transmission (R), subscriber status monitoring (S), analog/digital conversion (C), 2-wire 4-wire conversion (H), testing ( In a subscriber circuit of a digital exchange having a subscriber line interface function including each function of T), the subscriber circuit has the following functions:
A subscriber circuit characterized in that it has a function of accumulating subscriber line status signals and detecting transitions in subscriber status such as call origination, response, hooking, and disconnection by performing timing processing. (2) Call current supply (B), overvoltage protection (O), ringing signal transmission (R), subscriber status monitoring (S), analog/digital conversion (C), 2-wire 4-wire conversion (H), testing ( In a subscriber circuit of a digital exchange having a subscriber line interface function including each function of T), the subscriber circuit has the following functions:
A function that detects subscriber state transitions such as call origination, answering, hooking, and disconnection by accumulating subscriber line state signals and performing timing processing, and audible dial tone and busy tone via the subscriber line. an audible signal sending function that sends out to home equipment, a function that receives dial pulses sent from home equipment, multi-frequency signal selection signals, calling restriction identification, call analysis processing, pre-translation processing, reception and accumulation processing of selection signals. When a call is received, the system determines whether there is a line fault such as a ground fault or cross contact based on the incoming call command from the processing device, sends out a ringing signal, and automatically stops the ringing signal when it detects a response from the called party. A subscriber circuit comprising: