JPS6369399A - Digital exchange system - Google Patents

Abstract

PURPOSE:To attain independent and simultaneous operation of a call of a telephone set and a call of a data terminal equipment by receiving a selection signal for telephone exchange by the same reception circuit as that for a selection signal from an analog telephone set and transferring a data exchange selection signal to an exchange controller directly. CONSTITUTION:When a subscriber dials from a data terminal equipment 2 simultaneously from a digital telephone set 1, a call signal of the data terminal equipment is inserted in an area of a control signal for data exchange independently of the calling from the telephone set and sent to a digital subscriber circuit DLC 3, and the selection signal operated by the subscriber is sent to the DLC 3 in the data form to the area of the same control signal succeedingly. Since the multiplex, demultiplec circuit MUL/DEM 31 always sends the area signal to a data control signal circuit DSIG 33, the telephone control signal circuit TSIG 33 gives the signals to a CPU 6 as commands via an information circuit INF 35. Thus, the selection signal is sent simultaneously from the digital telephone set and the data terminal equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is applicable to digital exchanges, particularly subscriber lines connected to analog telephones, as well as subscriber lines connected to digital telephones and data terminals. It relates to a digital exchange that also accommodates lines.

[Conventional technology]

Conventionally, in this type of digital exchange, the subscriber line to which analog telephones (hereinafter referred to as analog telephones) are connected is A.
When the subscriber circuit that detects a call informs the exchange control device of the call, the exchange control device transfers this subscriber circuit to the communication path switch via a subscriber circuit having a D and DA converter. It is connected to a digital push button dial signal receiving circuit via the push button dial to receive selection signals from the push button dial. In addition, a digital telephone (hereinafter referred to as a digital telephone) alone or a subscriber line in which a digital telephone and a data terminal are connected receives call data that distinguishes between a digital telephone and a data terminal, and sends a message to the exchange control device from which device. A subscriber circuit (hereinafter referred to as a "digital subscriber circuit") has a conversion circuit that notifies whether a call is being made and, upon receiving a data format selection signal, converts this signal into a push button dial signal, further converts it to KAD, and sends it out. ) is housed in the communication path switch. Therefore, when this digital subscriber circuit detects a call and notifies the switching controller of the call, the switching controller connects the digital subscriber circuit to the call path, just as it would a subscriber circuit connected to an analog telephone. It is connected to a digital push button dial signal receiving circuit via a switch to receive a selection signal. Note that digital voice signals (for example, 64 bits/second PCM signal) and data (for example, 64 bits/second signal) are time-division multiplexed and transmitted on the subscriber line to which the digital telephone and data terminal are connected. The digital subscriber circuit is arranged so that both signals can be separated and connected to the outgoing line via separate communication paths within the communication path switch.

[Problem that the invention seeks to solve]

However, in the above-mentioned digital exchange, a digital telephone and a data terminal are connected to the same subscriber line, and supervisory signals such as calls to nine subscribers are sent and received as commands between the digital subscriber circuit and the exchange control device. However, since the selection signal from the subscriber is received by the digital push button dialing signal receiving circuit without distinguishing between the digital telephone and the data terminal, it is possible to distinguish between the digital telephone of the same subscriber and the data terminal. The problem is that the selection signals cannot be sent out at the same time.

Furthermore, even if the subscriber sends the selection signal in data format to the exchange at high speed, the digital subscriber circuit converts it into a push-button dial signal and sends it to the receiving circuit, slowing down the connection time. There is a problem that the length of the line becomes long.

An object of the present invention is to eliminate the above-mentioned problems, and to transmit digital voice signals, data, control signals for voice, and control signals for data in a time division multiplex manner on a subscriber line connected to a digital subscriber circuit. To provide a digital switching system in which a selection signal for data can be sent from a digital telephone and a data terminal at the same time by transmitting a selection signal for data as a command from a digital subscriber circuit to an exchange control device using a possible frame structure. It is in.

[Means for solving problems]

The present invention relates to a digital switching system for 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 line of this subscriber is performed using digital voice communication. The frame structure is multiplexed including a signal, a data signal, a control signal for telephone exchange, and a control signal for data exchange, and the digital subscriber circuit converts the selection signal for telephone exchange into a digital push button dial signal. The selection signal for data exchange is transmitted directly to the exchange control device in the form of a command.

With the above configuration, it is possible to send simultaneous &ζ selection signals from the X talk machine and the data terminal of the same subscriber, and the exchange 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, in which one frame of 125 μsec length includes a synchronization flag of multiple bits, a control signal for telephone exchange, a digital voice signal, A ramp for data signals and control signals for data exchange is provided.

FIG. 2 is a block diagram of one embodiment of the digital subscriber circuit according to the present invention, showing 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 is connected to a digital subscriber circuit (hereinafter referred to as DLC) 3 via a four-wire subscriber line. DLC3 is a multiplexing/demultiplexing circuit (hereinafter referred to as MUL/DEM) connected to the subscriber line.
) 31, and a telephone control signal circuit (hereinafter referred to as TSIG) 3 that transmits and receives control signals for telephone exchange to and from the DUL/DEM 31 and distinguishes the received control afl signal into a monitoring signal and a selection signal.
2, and a data control signal circuit (hereinafter referred to as DSIG) 3 that transmits and receives control signals for data exchange with the DUL/DEM 31.
3, a push button dial signal sending circuit (hereinafter referred to as PBS) 34 which converts the selection signal from the TSIG 32 into a push button dial signal and digitizes this signal, and the TSIG 32
and a connection circuit (hereinafter referred to as 1N) that transmits and receives supervisory signals for telephone exchange and supervisory signals and selection signals for data exchange between the DSIG 32 and the exchange control device 6, which will be described later.
F) 35. Furthermore, MUL/DE
M31 digital audio signal, data signal and PBS
The 34 output signals are accommodated as independent channels in a digital switch network (hereinafter referred to as DSW). Furthermore, a digital push button dial signal receiving circuit (hereinafter referred to as PBR) 5 is connected to the DSW 4, and the DLC 3's IN
F31. The DSW and PBR 5 are connected to a switching control unit (hereinafter referred to as CPU) 6 via a communication path control bus.

Proceeding with the explanation of the operation shown in FIG. 2 below, the digital telephone 1 to which the data terminal 2 is connected has a built-in digital signal multiplexing/demultiplexing circuit, and the control signal and communication signal of both terminals are DLC with the frame configuration shown in Figure 2
Preparations are being made to send and receive data to and from 3. That is, when both terminals are not in the calling state, only the synchronization flag is DLC3.
It is sent and received between. Therefore, when the digital telephone 1 is off-hook and a call is made, a call signal is inserted into the control signal area for telephone exchange and sent to the DLC 3.

Since the MUL/DEM 31 of the DLC 3 always sends a signal in this area to the TSIG 32, the TSIG 32 receives this signal, detects the calling signal, and sends this information to the CPU 6 as a calling command via the NF 35. tell to. Upon receiving this command, CPU6 executes the PB of DLC3.
The S34 and the vacant PBR5 are connected via the DSW4. Next, a data format selection signal is inserted from the digital telephone 1 into the control signal area for telephone exchange, and the DLC 3
When K is sent, this signal, like the calling signal, is transmitted to the TSI.
Since it is input to G32, TSIG32 detects that it is a selection signal and sends this data to PBS34. P.B.
S34 converts this data into a digital 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 telephone set (not shown).

By the way, when a subscriber makes a call from the data terminal 2 at the same time as the digital telephone 1, the calling signal from the data terminal is inserted into the area of the control signal for data exchange, independently of the above-mentioned calling operation from the telephone. Then, the selection signal operated by the subscriber is also sent to the DLC3 in data format in the same control signal area. However, MUL/DE
Since M31 always sends signals in this area to DSIG33, TSIG33 sends these signals to lNF.
35, the commands are transmitted to the CPU 6 as respective commands.

Also, commands sent from the CPU 6 to the digital telephone 1 and the data terminal 2 are both given to the INF 35,
lNF35 selects TSI according to the classification specified in the command.
Give commands to G32 and DSIG33. TSI
G32 and DSIG33 insert these signals into the command control signal area and transmit them to the terminal side.

Note that the digital voice signal and data signal within the frame are transmitted and received via the communication channel set in the DSW 4 by the CPU 6, as in the conventional digital exchange.

〔Effect of the invention〕

As explained above, according to the present invention, in a digital exchange that performs telephone exchange and data exchange, signal transmission between a subscriber having a digital telephone and a data terminal and the exchange is performed using a data exchange for telephone exchange and a digital exchange for data exchange. Each control signal is multiplexed into a frame structure, the selection signal for telephone exchange is received by the same receiving circuit as the selection signal from the analog telephone, and the selection signal for data exchange is directly transferred to the exchange control device. This has the advantage that calls from the telephone and calls from the data terminal can be made simultaneously and independently. Furthermore, when a call is made from a data terminal, the data can be transferred directly to the exchange control device without being converted into a push-button dial signal, which has the effect of shortening post-dial play.

[Brief explanation of the drawing]

FIG. 1 is a frame configuration diagram showing an embodiment of signal transmission on a subscriber line according to the present invention, and FIG. 2 is a block diagram of an embodiment of a digital subscriber circuit according to the present invention. 1...Digital telephone set, 2...Data terminal, 3...-Digital subscriber circuit (DLC)
, 4...Digital switch network (DSW)
, 5... Digital push button dial signal receiving circuit (PBR), 31... Multiplexing/separating multiplexing circuit (MUL/DEM), 32... Telephone control signal circuit (TSIG), 33...Data control signal circuit (DSIG), 34...Push button dial No.
1 Figure 2

Claims (1)

[Claims] In a digital switching system for telephone exchange and data exchange, signal transmission between a subscriber with a digital telephone and a data terminal and a digital subscriber circuit accommodating the subscriber's subscriber line involves the transmission of digital voice signals and data. The frame structure is multiplexed including a signal, a control signal for telephone exchange, and a control signal for data exchange, and the digital subscriber circuit converts the selection signal for telephone exchange into a digitized push button dial signal to make a call. A digital exchange system characterized by sending a selection signal for data exchange to a push-button dial signal receiving circuit via a path switch and directly transmitting a selection signal for data exchange in the form of a command to an exchange control device.