JPS6154740A - Control system of data call connection - Google Patents

Abstract

PURPOSE:To utilize effectively origination/termination control basing on a call progress signal that a terminal side has originally and performing proper countermeasure processing corresponding to the state of the opposite terminal by returning the connection state of the call of a terminating data terminal in the form of the call process signal when a data call connection is made through a trunk line. CONSTITUTION:When a data terminal 1 that an originating station is equipped with originates, calling information and dial information are sent out to a subscriber circuit 3 and read in a common controller 6. Consequently, the common controller 6 sends indications of actuation of and dial transmission to a terminating station to a digital trunk 5. A termination-side digital trunk 15 sends the received actuation and received dial information to the common controller 16. If a termination-side data terminal 11 is in communication, the common controller 16 detects that and the digital trunk 5 reports the identification result to the common controller 6 of the main body successively. The common controller 6 instructs the subscriber circuit 3 to which the originating data terminal 1 is connected to send a call progress signal showing the opposite party is engaged according to the report result.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a data call connection control method via a digital trunk line.The data call connection control method of the present invention is used in a digital switching system including a digital electronic exchange.

[Conventional technology]

Conventionally, in switching systems that connect via trunk lines, telephone connections are the main connection, and the signals that the destination exchange sends back to the originating exchange via the telephone line from the time the call is received until the connection is completed are There are only several types of tone signals, such as , dial tone, ring tone, and one-busy tone.

For this reason, the caller must listen to these tone signals and separate them.
Can judge the other person's condition.

On the other hand, with the development of digital communications in recent years, digital data terminals have come into widespread use, and in such digital data terminal connections, the communication path from terminal to terminal is entirely digital. As a digital data terminal, for example, CCITT recommendation X
Interface devices are known, but such data terminals have a function that can receive call progress signals that notify the status of the opposing data terminal, such as busy, connection restriction 2 call rejection, and idle number dialing. This allows appropriate response processing to be performed depending on the status of the game data terminal.

[Problems to be Solved by the Invention] In the conventional connection via relay w4, the destination exchange has only a function of returning several types of tone signals to the origination exchange. For this reason, for example, when the incoming data terminal is busy,
Connection Regulation 2 In response to incoming call rejection, idle numbers, etc., a busy tone signal is simply returned, and the status of the calling data terminal cannot be accurately identified, making it impossible to take appropriate countermeasures.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a data call connection control method between data terminals in a switching system in which digital electronic exchanges are interconnected via digital medium wires, The exchange is equipped with a function to send a certain pattern signal according to the call connection status of the destination data terminal to the used channel of the digital trunk line toward the originating exchange. A function that detects and detects the call connection status of the destination data terminal,
Further, a data call connection control system is provided, characterized in that it is equipped with a function of notifying the detected call connection state to the originating data terminal in the form of a call progress signal.

[For production]

When a call is made from the originating data terminal, the terminating exchange checks the call connection status of the terminating data terminal, and if the terminating data terminal is, for example, in a call rejection state, it issues a corresponding pattern signal via the channel in use. The originating exchange identifies the call connection state of the destination data terminal based on the sent pattern signal, and sends a corresponding call progress signal to the originating data terminal. This allows the originating data terminal to know the call connection status of the terminating data terminal by effectively utilizing the call progress signal reception function of the terminal, and to take appropriate countermeasures.

〔Example〕

The configuration of a switching system using a data call connection control method as an embodiment of the present invention is shown in FIG.

The data terminals 1, 11 are terminals, such as computers, equipped with a call progress signal receiving function, and are connected to digital subscriber circuits 3, 13 of the exchange via data terminal interface devices 2, 12.

Data terminal interface equipment? i! 2 and 12 edit the signals of the data terminals 1 and 11 and send them as digital signals to the exchange, or send the digital signals received from the exchange to the data terminals 1 and 11 in accordance with the interface conditions with the data terminals.

Digital subscriber circuits 3, 13 are circuits for accommodating data terminal interface devices 12, 12, and are connected to digital trunk 5j15 via networks 4, 14. Digital trunk 5,1
Reference numeral 5 denotes a trunk for accommodating the digital relay line 20 in the exchange, and is interconnected with the opposing station via the digital relay line 20.

The common control devices 6 and 16 control each device within the exchange. The digital pattern sending device 7.17 generates a fixed 8-bit digital pattern corresponding to each call progress signal indicating the connection status of the data terminal! It is yJa. In the switching system shown in FIG. 1, communication between data terminals 1 and 11 is entirely digital.

The configuration of the digital subscriber circuit 3 in FIG. 1 is shown in FIG. Note that the configuration of the digital subscriber circuit 13 is also similar.

In FIG. 2, the upper side is the uplink, and the lower side is the downlink. The 8-bit serial data sent from the data terminal 1 is converted into 8-bit parallel data used for processing inside the subscriber circuit 3 by the register 301, and is input to the register 303 via the selection circuit 302. The 8-bit parallel data is again converted to 8-bit serial data and sent to the network 4.

The selection circuit 302 selects whether the data to be sent to the network 4 is the data from the data terminal 1 or the fixed pattern data indicating the idle state from the idle data circuit 305 according to instructions from the microprocessor 304. do.

The contents of register 301, ie, information (data) sent from data terminal 1, are latched in register 306, read out by scanning bag N 307, and sent to microprocessor 304. Microprocessor 304
is connected to the common control device 6.

On the other hand, 8-bit serial data sent from network 4 is converted into 8-bit parallel data by register 308, sent to register 310 via selection circuit 309, and converted back to 8-bit serial data by register 310. It is sent to data terminal 1. Selection circuit 30
9 selects whether the data to be sent to the data terminal 1 is data from the network 4 or SD point information (for example, a call progress signal) from the signal distribution device 311 according to an instruction from the microprocessor 304. The signal distribution device 311 is a microprocessor 3
Under the control of 04, various information such as switching information of the selection circuits 303 and 309 and a call progress signal is sent out.

The (n configuration) of the digital trunk 5 in FIG. 1 is shown in FIG. The data is converted into 8-bit serial data and input to the register 503 via the selection circuit 502, where it is again converted to 8-bit serial data and sent to the network 4.
4 is selected as data from the digital trunk line 20 or fixed pattern all-zero data from the pattern generation circuit 505.

The contents of the register 501, that is, the information (data) sent from the digital trunk line, is latched in the register 506, read out by the scanning bag W507, and sent to the microprocessor nosa 504.

The 8-bit serial data sent from network 4 is changed to 8-bit parallel data in register 508.
A is sent to the register 510 via the selection circuit 509, where it is again converted into 8-bit serial data and sent to the digital relay line 20. The selection circuit 509 selects the data to be sent to the digital trunk line 20 from the network 4 according to instructions from the microprocessor 504.
or pattern generation circuit 51.
Select whether to use fixed pattern data from 2 (8-bit data indicating data all zero). The signal distribution device 511 sends out switching information for the selection circuits 502 and 504 under the control of the microprocessor 504.

The operation of the switching system of FIG. 1 will be explained below with reference to the time chart of FIG.

Now, when a call is made from the data terminal l housed in the calling station, call information and dial information are sent to the subscriber circuit 3, and these information (are read into the common control device 6. As a result, the common control device 6 instructs the digital trunk 5 to activate and send a dial to the called station.The digital trunk 15 on the called side notifies the common control device 16 of the received activation and received dial information.

The common control device 16 of the receiving station is connected to the data terminal 1 accommodated therein.
Information regarding the connection status of 1, e.g. communicating, connection regulation 1
Information such as call rejection and blank number dialing is constantly monitored.

Now, if the called data terminal 11 is in communication, the common control device 16 detects this and connects the communication path of the digital trunk 15 to the digital pattern sending device 17 within the network 14. A digital pattern indicating that communication is in progress from 17, for example rllooollo.
The 8-bit pattern of lJ is transmitted bit serially.

This digital pattern reaches the digital trunk 5 of the originating station through the used channel of the digital trunk 20.

In the digital trunk 5, the digital pattern sent via the digital trunk is latched in a register 506 and scanned by a scanning device 507 under the control of the microprocessor 504. As a result of the scan, the microprocessor 504 identifies the state of the receiving station data terminal 11, that is, that it is communicating, and notifies the common control device 6 of the main body of the identification result. The common control device 6 provides for the subscriber circuit 3 accommodating the originating data terminal 1,
Instructs that a call progress signal indicating that the other party is communicating according to the notification result should be sent.

In the subscriber circuit 3, when the microprocessor 304 receives an instruction to send a call progress signal from the common control device 6, it can switch the selection circuit 309 to the signal distribution device 311 side and send information from the signal distribution device 311 to the data terminal l. Set it as follows.

Then, it determines the call progress signal to be sent (in this example, the call progress signal during communication with the other party) according to instructions from the common control device 6, sets 8-bit data to the signal distribution device t311, and sends the data to the signal distribution device t311. Send to terminal 1.

This allows the originating data terminal 1 to know the status of the incoming data terminal from the call progress signal, so that it can take appropriate countermeasures.

For example, in the embodiment described above, the digital pattern indicating the status of the incoming data terminal transmitted from the incoming station is transmitted from the digital pattern sending device 17 to the network. 14, but is not limited to this, for example, the data terminal 11, the data terminal interface device 12
, the digital subscriber circuit 13, the digital trunk 15, or the like.

In addition, in the above-mentioned embodiment, the digital
The pattern was detected using Digicle Trunk 5.
In addition to this, for example, a trunk for pattern detection may be provided separately.

〔Effect of the invention〕

According to the present invention, when making a data call connection via a trunk line, the call connection status of the incoming data terminal, for example, communicating with the other party, connection restriction, idle number dialing, etc., is transmitted to the originating data terminal in the form of a call progress signal. This makes it possible to make effective use of the terminal's original call progress signal to control incoming and outgoing calls, and to perform appropriate response processing depending on the status of the other party's terminal.For example, when the other party's terminal is communicating, Since the terminal can actively perform disconnection processing by receiving the call progress signal, the period of invalidation of the trunk line is shortened, leading to improved utilization efficiency.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a switching system using a data call connection control method as an embodiment of the present invention, FIG. 2 is a block diagram of a digital subscriber circuit in the system shown in FIG.
1 is a block diagram of a digital trunk in the system shown in FIG. 1, and FIG. 4 is a time chart for explaining the operation of the system shown in FIG. 1.11...-data terminal, 2.12...-data terminal interface, 3.13-
...Digital subscriber circuit, 4.14--Network, 5.15--Digital trunk, 6.16--
Common control device, 7.17...-Digital pattern sending device, 20.
-Digital relay line.

Claims (1)

[Claims] 1. A data call connection control method between data terminals in an exchange system in which digital electronic exchanges are interconnected via digital trunk lines, in which a digital trunk line is used for the destination exchange to connect to the originating exchange. The channel is equipped with a function to send a certain pattern signal according to the call connection status of the destination data terminal, and the originating exchange has a function to detect the pattern signal and detect the call connection status of the destination data terminal. , and a function of notifying the originating data terminal of the detected call connection state in the form of a call progress signal.