JPS60208152A - High performance function terminal connection controlling system - Google Patents

Abstract

PURPOSE:To simplify the circuit by providing a link control circuit and a link circuit to a subscriber circuit and a high performance function terminal device transferring connection control information between a central controller of an exchange and plural high performance function terminal devices. CONSTITUTION:The central controller CC2 of the exchange connected to a network 1 of the exchange is connected to plural subscriber lines 4. The subscriber circuit 4 is controlled by a microprocessor MPU10, connected to the CC2 via an interface 13 so as to transmit/receive the data. The MPU10 writes, reads data to/from a RAM11, the link control circuit 14 is controlled by a program of a ROM12 and transmission line interface circuits 15a-15n input/output the data to the high performance function terminal devices 5a-5n connected in a link form. For example, when the high performance function terminal device 5b makes a call, the call is fed to the control circuit in the path of 15b 15c 15c 15c ... 15n 5n 15n and transferred to the CC2. Thus, the circuit is simplified and the MPU10 is controlled easily.

Description

[Detailed description of the invention] Technical field of invention The present invention relates to a subscriber circuit of an exchange and voice information.

The present invention relates to a high-performance terminal connection control system in which high-performance terminals capable of transmitting and receiving image information or various data are connected in a loop to transfer connection control information to a central control unit of an exchange.

Prior Art and Problems High-performance terminals that include not only telephone functions but also facsimile functions and data transmission functions have been proposed.

High-performance terminals, such as computers, contain microprocessors,
Connection control information such as outgoing call information and incoming call information, and voice 1R reports and data are transferred over separate lines, and the connection control information is transferred to the central control unit of the exchange via the subscriber circuit. transferred between. Also, the transmission/reception circuit for voice information, data, etc. is connected to the exchange network via the subscriber circuit.

The subscriber circuit for transferring connection control information is configured with a microprocessor so that it can accommodate multiple high-performance terminals, and controls the transfer of connection control information to and from the central control unit of the exchange. . In that case, the subscriber circuit will require a No. 111 boat for each high-performance terminal, and therefore, the more advanced terminals to accommodate, the more hardware the subscriber circuit will require. , and has the disadvantage that the processing procedure is complicated because it has a plurality of signal ports. In addition, connection control information such as outgoing and incoming calls is not transferred all the time, but as mentioned above, a signal boat is prepared for high-performance terminals and a certain communication capacity is secured. It had the disadvantage of low usage efficiency.

OBJECTS OF THE INVENTION The object of the present invention is to reduce the amount of hardware of a subscriber circuit accommodating a plurality of high-performance terminals and to economically enable connection between high-performance terminals and exchanges. be.

Structure of the Invention The present invention provides a subscriber circuit for transferring connection control information between a central control unit of an exchange and a plurality of high-performance terminals, and a link control circuit for each of the plurality of high-performance terminals. The link control circuits are connected by a loop transmission path so as to connect the high-performance terminals of the above-mentioned and the subscriber circuits in a loop, and the high-performance terminals are connected between the central control device of the AC and the plurality of high-performance terminals. Connection control information is transferred via the link control circuit of the subscriber circuit and the loop transmission path, and the exchange controls the connection between the high-performance terminals, thereby reducing the amount of hardware in the subscriber circuit. can be achieved. Examples will be described in detail below.

Embodiment of the Invention FIG. 1 is a block diagram of main parts of an embodiment of the invention, in which a network 1 of an exchange is controlled by a central controller (CG) 2 and accommodated via a subscriber circuit 3. A communication path is formed between the terminal 5 and the other party's high-performance terminal, and voice information and various data are transmitted and received. Also, high-performance terminal 5
Connection control information is transferred between the subscriber circuit 4 and the central control device 2 of the exchange via the subscriber circuit 4, and the subscriber circuit 4 and the high-performance terminal 5 are connected by a loop transmission path.

FIG. 2 is a block diagram of the main parts of the subscriber circuit 4 according to the embodiment of the present invention, and IO is a microprocessor (MPtJ).
, 11 is a random access memory (RAM), and 12 is a one-way only memory (ROM) for storing programs etc.
, I 3 connects the conjunction 1 with the central control bag M2 of the exchange.
■An interface circuit for transmitting and receiving information, 14 is a link control circuit that controls the loop transmission path, 15a to 15n are transmission path interface circuits, 16 is a loop transmission path, 5a
~5n is a high-performance terminal. These high-performance terminals 5a to 5n
is connected to the link control circuit 14 in a loop.

The transmission line interface circuits +5a to 15n are for simply converting the signal level between the loop transmission line 16 and the subscriber circuit 4, and the link system 4111 circuit 14 is for connection from the central control unit 2 of the exchange. It has a function of sending control information to the loop transmission line 16, extracting connection control information sent from the high-performance terminals 53 to 5n to the loop transmission line 16, and transferring it to the central control unit 2 of the exchange. Data is transferred to this central control bag W12 via an interface circuit 13, and each part is controlled by a microprocessor IO. For example, if the call information from the high-performance terminal 5b is sent to the loop transmission line 16, 15b-15cm
5cm15c = -15n -5n-15n-1
4 to the link control circuit 14, extracted by the link control circuit 14, and transferred to the central control unit 2 of the exchange via the interface circuit 13 under the control of the microprocessor IO.

FIG. 3 is a dock diagram of the main parts of the high-performance terminal according to the embodiment of the present invention.
), 2+ is a memory (MEM), 22 is a link control circuit, 23 is a transmitting/receiving circuit for audio information and data, 24 is a terminal interface circuit, 25 is a converter for converting a digital signal into an analog signal or an analog signal into a digital signal. 26 is a signal generation circuit, 27 is a display device, 28 is a data input/output device including a keyboard, etc., 29
is a facsimile machine, and 30 is a handset.

The link control circuit 22 is connected to the loop transmission line 16, extracts connection control information addressed to its own terminal from among the connection control information transferred via the loop transmission line 16, and also extracts connection control information addressed to its own terminal and transfers it to the central control bag W2 of the exchange. The connection control information is sent by detecting the loop transmission line 16 as empty. The transmitting/receiving circuit 23 is connected to the subscriber circuit 3 of the exchange and is used to transmit and receive voice information, data, etc. The received digital voice information is converted into an analog signal by the conversion circuit 25 and sent to the handset 30. The analog audio signal from the handset 30 is also converted into a digital audio signal and applied to the transmitter/receiver circuit 23. The received image information is added to the display device 27 via the terminal interface circuit 24 for display, or added to the facsimile device 29 and output as a hard copy.

Further, when the link control circuit 22 extracts, for example, incoming call information from the own terminal via the loop transmission line 16, the microprocessor 20 controls the signal generation circuit 26 to 1tJl 111.
to send out a ringtone. As a result, a speaker or a buzzer (not shown) is driven to emit a ringing tone without indicating an incoming call. Further, when a call is made, a ring hack tone, a busy tone, etc. are also generated from the signal generating circuit 26 under the control of the microprocessor 20.

FIG. 4 shows an example of the data format sent to the loop transmission path 16, where F is frame l, a synchronization flag, A is an address indicating a transfer destination, C is a control command or response, D is data, and FC8 is the frame check sequence. Such a frame is formed in the link control circuit 14.22, and the address A of the received frame is changed (separately, whether data D is extracted or transferred to the next frame is controlled).

FIG. 5 is a block diagram of main parts of a link control circuit according to an embodiment of the present invention, in which 31 is a receiving circuit, 32 is a synchronization control circuit that includes a buffer memory and forms a data format, and 3
3 is a transmitting circuit, 34 is an address detection circuit, 35 is a gate circuit, and 36 is a common bus. As shown in FIG. 4, the connection control information transferred via the loop transmission path 16 has the transfer destination address 8 added thereto, so the address detection circuit 34 identifies whether or not the own terminal is complete. However, if the own terminal is completed, the gate circuit 35 is opened and the buffered received data is transferred to the microprocessor 20 via the common bus 36. The connection control information sent from the own terminal to the central side A unit W2 of the exchange is transferred from the common bus 36 to the synchronous control circuit 32, and the synchronous control 1ri81 path 32 is connected to the fourth Transmit with the frame structure shown in the figure ■1 Transfer to path 33, transmit circuit 3
3 to the loop transmission path 16. Also subscriber circuit 4
The link control circuit 14 identifies address 8 and sends the data addressed to the central controller 2 to the central controller 2 via the interface circuit 13 under the control of the microprocessor 10.

FIG. 6 shows the high-performance terminal T1. This shows the call processing sequence from call origination to conversation between T2 and the high-performance terminal T1.
When a call is made due to off-hook of the handset 30,
The microprocessor 20 of the high-performance terminal T1 controls the signal generation circuit 26 to send the dial tone DT to the handset 3.
0 (see Figure 3). This dial tone DT
When the microprocessor 20 hears and dials, the microprocessor 20 receives the dial information according to the digit reception and translation program, and disconnects the dial tone D'r.

Then, from the link control circuit 22 to the loop transmission path 16, the frame structure shown in FIG. 4 is used. Il! Sends a call request including speaker information.

When the subscriber circuit 4 identifies by the address A that this call request is addressed to the central control unit CC of the exchange, it transfers the call request to the central control unit CC via the interface circuit 13.

When the central control unit CC receives a call request from the calling high-function terminal TI via the subscriber circuit 4, the central control unit CC sends a call to the center of the subscriber circuit 4 in which the called high-function terminal T2 is accommodated or another exchange. Transfers the outgoing 1hl request to the control device. When the subscriber circuit 4 receives a call request from the central controller CC to the high-performance terminal T2 via the interface circuit 13,
A frame for the high-performance terminal T2 is formed in the link control circuit 14 and sent to the loop transmission line 16.

The high-performance terminal T2 that received this call request sends a connection failure notification if it is busy, and if it is not busy, it sends a ring tone R.
G activation is performed, and the connection availability i1 information is sent to the central control unit CC of the exchange via the loop transmission line 16 and the subscriber circuit 4 described above. This connection permission notification is sent from the central control unit CC of the exchange via the subscriber circuit 4 and the loop transmission path 16 to the high-performance terminal T1 that made the call.

The high-function terminal TI that made the call performs a ring bank tone RBT connection upon notification of connection availability. This is the signal generation circuit 26
The ring hack tone R13T is generated by controlling the ring hack tone R13T. In addition, the high-performance terminal T2 on the called side controls the signal generation circuit 26 to send out a ring tone, and when a response is detected by off-off detection of the handset 30, it stops sending out the ring tone RG and makes it possible to make an itn call. It is sent to the central control unit CC of the faith notification exchange via the loop transmission line 16 and the subscriber circuit 4.

The central control unit CC of the exchange controls the communication network by communication re-notification, connects the communication path, and sends the communication re-notification to the calling high-function terminal ``1'' via the subscriber circuit 4 and the loop transmission line 16. The high-performance terminal TI, which has received this notification that communication is possible, disconnects the ringback tone RBT, and the high-performance terminals T1 and T2 are connected via the exchange network, and a call is in progress.

When the handset 30 is turned on-hook due to the end of the call, a disconnection request is sent from the high-performance terminal to the central side 81 device CC of the exchange, and the central control device CC restores the 1ff1 channel formed in the network, and The process ends by sending a disconnection request to the high-performance terminal on the other end.

Note that the transfer control of the connection control information via the loop transmission line 16 can also be performed by various control means C other than the above-mentioned embodiments, and can be controlled depending on the distance between the subscriber circuit 4 and the high-performance terminal 5. Considering transmission delay time etc., high-performance terminal 5
It is preferable to take measures to prevent collisions of ill information sent from the connected side.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention provides a central control unit 2 for a switching system.
The subscriber circuit 4 and the plurality of high-function terminals 5 are provided with link control circuits 14 and 22, respectively, for transferring connection control information between the high-performance terminals 5 and the plurality of high-performance terminals 5. The link control circuits 14 and 22 are connected by a loop transmission path 16 so as to connect the subscriber circuits 4 in a loop, and the connection control between the central control device 2 of the exchange and the plurality of high-performance terminals 5 is performed. Information is transferred via the link control circuit 14 of the subscriber circuit 4 and the loop transmission path 16, and the connection between the high-performance terminals 5 is controlled by the exchange.
Since only one link control circuit 14 of the subscriber circuit 4 is required for a plurality of high-performance terminals 5, and there is only one signal port, control by the microprocessor 10 is facilitated, and the hardware It has the advantage of being able to reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main part of the embodiment of the present invention, FIG. 2 is a block diagram of the main part of the subscriber circuit according to the embodiment of the present invention, and FIG.
4 is a block diagram of the main parts of a high-performance terminal according to an embodiment of the present invention, FIG. 4 is a data format sent to a loop transmission path, and FIG. FIG. 6 shows a call processing sequence according to an embodiment of the present invention. 1 is the exchange network, 2 is the central control unit of the exchange, 3.4 is the subscriber circuit, 5.5a to 5n are high-performance terminals,
10.20 is a microprocessor, 11 is a random access memory, 12 is a 1' only memory, 13 is an interface circuit, 14 is a link control circuit, +5a-1
5n is a transmission line interface circuit, 16 is a loop transmission line, 21 is a memory, 22 is a link control circuit, 23 is a transmission/reception circuit, 24 is a terminal interface circuit, 25 is a conversion circuit, 26 is a signal generation circuit, and 30 is a handset. be. Patent Applicant Fuji Jm Co., Ltd. Representative Patent Attorney Akio Aitani Representative Patent Attorney Hiroshi Watanabe - Figure 1 5 Figure 2 ( Figure 3 0 FACD Fe2P Figure 5 1

Claims (1)

[Claims] A subscriber circuit for transferring connection control information between the central control unit of the exchange and the plurality of high-performance terminals and a link control circuit for each of the plurality of high-performance terminals are provided, and a link control circuit is provided for each of the plurality of high-performance terminals and the subscriber circuit. connecting the link control circuits by a loop transmission path so as to connect the link control circuits with the control circuit in a loop;
Connection control information between the central control unit of the exchange and the plurality of high-performance terminals is transferred via the link control circuit of the subscriber circuit and the loop transmission path, and the exchange between the high-performance terminals is performed by the exchange. A high-performance terminal connection control method characterized by connection control.