JPH0752973B2 - Digital exchange method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital exchange, and in particular to a subscriber line to which an analog telephone is connected, as well as a subscriber to which a digital telephone and a data terminal are connected. It relates to a digital exchange that also accommodates lines.

[Conventional technology]

Conventionally, in this type of digital exchange, the subscriber line to which an analog telephone (hereinafter, analog telephone) is connected is AD.
When the subscriber circuit which has received the call informs the exchange control device of the call through the subscriber circuit having the DA converter and the DA converter, the exchange control device notifies the addition circuit of the addition circuit. It is connected to the digital push button dial signal receiving circuit via the so as to receive the selection signal by the push button dial. Further, a digital telephone (hereinafter referred to as a digital telephone) alone or a subscriber circuit in which a digital telephone and a data terminal are connected receives a call data for distinguishing between the digital telephone and the data terminal, and the switching control device sends the data. A subscriber circuit (hereinafter referred to as a "digital subscriber circuit") having a conversion circuit for notifying whether a call is made and receiving a data format selection signal, converts this signal into a push button dial signal, and further performs AD conversion before sending. It is accommodated in the call path switch via the ". Then, when this digital subscriber circuit detects a call and informs the call to the exchange control device, the exchange control device switches the digital subscriber circuit to the call path as in the case of the subscriber circuit to which the analog telephone is connected. It connects to a digital push button dial signal receiving circuit via a switch to receive a selection signal. A digital voice signal (for example, 64 kbit / sec P
(CM signal) and data (for example, 64 kbit / sec signal) are time-division multiplexed and transmitted, and the digital subscriber circuit separates both signals and outputs via separate call paths in the call path switch. You can connect with.

[Problems to be solved by the invention]

However, the above-mentioned digital exchange sends and receives a monitoring signal such as a call to a subscriber who connects the digital telephone and the data terminal to the same subscriber line as a command between the digital subscriber circuit and the exchange control device. On the other hand, since the selection signal from the subscriber is received by the digital push button dial signal receiving circuit without distinguishing between the digital telephone and the data terminal, the digital telephone and the data terminal of the same subscriber are There is a problem that the selection signals cannot be transmitted at the same time. Even if the subscriber side sends a selection signal in high-speed data format to the exchange side at high speed, the digital subscriber circuit converts it into a push-button dial signal and sends it to the receiving circuit, which slows down the connection time. There is a problem that

Further, in a digital exchange that accommodates an analog telephone, if the selection signal sent from the digital telephone is given as a command to the exchange control device, there is a problem that it must have two signal reception processing functions. There is.

An object of the present invention is to eliminate the above-mentioned problems and to transmit a digital voice signal, data, a voice control signal and a data control signal by time division multiplexing on a subscriber line to which a digital subscriber circuit is connected. An object of the present invention is to provide a digital switching system capable of simultaneously sending selection signals from a digital telephone and a data terminal by adopting a frame structure and transferring a selection signal for data from a digital subscriber circuit to a switching control device as a command.

[Means for solving problems]

The present invention relates to a digital switching system for performing telephone exchange and data exchange, in which signal transmission between a subscriber having a digital telephone and a data terminal and a digital subscriber circuit accommodating the subscriber's subscriber line is digital voice. A signal, a data signal, a control signal for telephone exchange and a control signal for data exchange are multiplexed to form a frame structure, and the digital subscriber circuit converts the selection signal for telephone exchange into a digitized push button dial signal. Then, the signal is sent to the push-button dial signal receiving circuit via the communication path switch, and the selection signal for data exchange is directly transferred to the exchange control device in the command format.

With the above configuration, it is possible to simultaneously transmit the respective selection signals from the telephone and the data terminal of the same subscriber,
The switch can process both selection signals simultaneously.

〔Example〕

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

FIG. 1 is a frame configuration diagram showing an embodiment of signal transmission on a subscriber line according to the present invention. A synchronization flag of a plurality of bits, a control signal for telephone exchange, a digital voice signal, and data are formed in one frame having a length of 125 .mu.s. Areas for signals and control signals for data exchange are provided.

FIG. 2 is a block diagram of an embodiment of the digital subscriber circuit according to the present invention, and shows an exchange and a subscriber terminal including the digital subscriber circuit. In the figure, a subscriber terminal has a digital telephone 1 and a data terminal 2, and a digital subscriber circuit (hereinafter
DLC) 3 is connected. DLC3 is a multiplexing / demultiplexing circuit (hereinafter MUL / DEM) 31 connected to the subscriber line, and DUL / D
Telephone control signal circuit (hereinafter TSIG) 32 that sends and receives control signals for telephone exchange with EM31 and discriminates the received control signals into monitoring signals and selection signals, and sends and receives control signals for data exchange with DUL / DEM31 Data control signal circuit (hereinafter DSIG)
33, and a push button dial signal sending circuit (hereinafter referred to as PBS) 34 for converting the selection signal from TSIG32 into a push button dial signal and digitizing this signal, between TSIG32 and DSIG32 and the exchange control device 6 described later, It is configured to include a connection circuit (hereinafter referred to as INF) 35 for transmitting / receiving a monitoring signal for telephone exchange and transmitting / receiving a monitoring signal for data exchange and a selection signal. The digital voice signal, the data signal of the MUL / DEM 31 and the output signal of the PBS 34 are contained in the digital switch circuit network (hereinafter referred to as DSW) 4 as independent channels. Further, a digital push button dial signal receiving circuit (hereinafter referred to as PBR) 5 is connected to DSW4, and INF35 and DSW of DLC3 are connected.
The PBR 5 and the PBR 5 are connected to an exchange control device (hereinafter CPU) 6 via a communication path control bus.

The operation of FIG. 2 will be described below. The digital telephone 1 to which the data terminal 2 is connected has a built-in digital signal multiplexing / demultiplexing circuit, which controls the control signals and the communication signals of both terminals. The frame structure shown in Fig. 2 is ready to be sent to and received from DLC3. That is, when neither terminal is in the calling state, only the synchronization flag is transmitted / received to / from the DLC3. Therefore, when the digital telephone 1 is put off-hook to make a call, the calling signal is inserted into the control signal area for telephone exchange and sent to the DLC 3. The MUL / DEM31 of DLC3 always sends the signal of this area to TSIG32, so TSIG32
32 receives this signal and detects that it is a calling signal,
This information is transmitted to the CPU 6 as a call command via the INF 35. CPU6 receives this command and PBS34 of DLC3 and empty P
BR5 is connected via DSW4. Next, when a data format selection signal is inserted from the digital telephone 1 into the control signal area for telephone exchange and sent to the DLC3, this signal is input to the TSIG32 in the same manner as the calling signal, so the TSIG32 selects the selection signal. And sends this data to the PBS 34. The PBS 34 converts this data into a digitized push button dial signal and sends it to the already connected PBR 5. The PBR 5 receives this dial signal and transfers the dialed digits to the CPU 6, as in the case of an analog type telephone (not shown).

By the way, when the subscriber makes a call from the data terminal 2 simultaneously with the digital telephone 1, the call signal of the data terminal is inserted into the area of the control signal for data exchange, independently of the call operation from the above-mentioned telephone. Then, the selection signal operated by the subscriber is also sent to the DLC3 in the same control signal area in the data format. However, since the MUL / DEM 31 always sends the signals in this area to the DSIG 33, the TSIG 33 sends these signals to the CPU 6 as respective commands via the INF 35.

Further, the commands sent from the CPU 6 to the digital telephone 1 and the data terminal 2 are both given to the INF 35, and the INF 35 gives the commands to the TSIG 32 and DSIG 33 according to the classification specified in the command. Since TSIG32 and DSIG33 give the control signal according to the command to MUL / DEM31, MUL / DEM31 inserts these signals in the area of each control signal, and transmits to the terminal side.

The digital voice signal and data signal in the frame are sent to the DSW4 by the CPU6 as in the conventional digital exchange.
It is transmitted and received via the call channel set to.

〔The invention's effect〕

As described above, according to the present invention, in digital exchange for performing telephone exchange and data exchange, signal transmission between a subscriber having a digital telephone and a data terminal and an exchange is performed for data exchange for telephone exchange. Each control signal has a multiplexed frame structure, and the selection signal for telephone exchange is received by the same receiving circuit as the selection signal from the analog type telephone, and the selection signal for data exchange is directly transferred to the exchange control device. By doing so, there is an effect that the call originating from the telephone and the call originating from the data terminal can be made independently at the same time. Further, when a call is made from the data terminal, the data can be directly transferred to the exchange control device without being converted into a push button dial signal, so that there is an effect that the post dial delay can be shortened.

[Brief description of drawings]

FIG. 1 is a frame configuration diagram showing an embodiment of signal transmission on a subscriber line in the present invention, and FIG. 2 is a block diagram of an embodiment of a digital subscriber circuit in the present invention. 1 ... Digital telephone, 2 ... Data terminal, 3 ... Digital subscriber circuit (DLC), 4 ... Digital switch network (DSW), 5 ... Digital push button dial signal receiving circuit (PBR), 31 ... Multiplexing / demultiplexing circuit (MUL
/ DEM), 32 ... telephone control signal circuit (TSIG), 33 ... data control signal circuit (DSIG), 34 ... push button dial signal transmission circuit (PBS), 35 ... connection circuit (INF).

Claims (1)

[Claims] 1. In a digital exchange system in which telephone exchange and data exchange are performed through one speech path switch, a push button dial signal sent from an analog telephone is digitized in a subscriber circuit to which the analog telephone is connected. Converted into a push-button dial signal and transmitted to the push-button dial signal receiving circuit via the communication path switch to connect the subscriber with the digital telephone alone or the digital telephone and the data terminal to the subscriber's subscriber line. The signal transmission to and from the subscriber circuit has a multiplexed frame structure including a digital voice signal, a data signal, a control signal for telephone exchange and a control signal for data exchange, and the digital subscriber circuit is for telephone exchange. The push button is converted into a digitized push button dial signal, and the push button It sent to dial signal receiving circuit, a digital switching system, characterized by transferring the selection signal for the data exchange directly to the switching control unit in the command format.