JPS6132858B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a digital data exchange network using envelope signals that allows terminals to be used as full-duplex or half-duplex communication terminals, and a telephone switching network that allows terminals to be used as half-duplex communication terminals. This invention relates to an inter-network connection communication system designed to perform mutual data communication between networks.

In a digital data exchange network where terminals are used for full-duplex communication or half-duplex communication, when digital data from one terminal is transmitted to another terminal, the digital data from one terminal An embodiment in which data is composed into 6 data bits of digital data in a line termination device, and one F bit as a synchronization bit and one S bit as a control bit are arranged before and after the data bits. This is converted into an envelope signal and transmitted to the other terminal via a time-division digital data exchanger and a digital transmission line, and conversely, the line termination equipment for one terminal is connected to the other terminal When receiving multiple envelope signals via a digital transmission line and a digital data exchange, it is common that the line termination equipment converts the signals and receives them at one terminal.

In addition, in a telephone switching network where terminals are used as half-duplex communication terminals, when one terminal transmits digital data to another terminal, the digital data from one terminal is sent to a carrier by a modem. converts it into a modulated data signal that is modulated with digital data, and transmits it to another terminal via a space-division type telephone exchange such as a crossbar type and an analog transmission line, and Conversely, when a modulator/demodulator for one terminal receives a modulated data signal from another terminal via an analog transmission line and a telephone exchange, the modulator converts the modulated data signal into digital data, Even if this is received by one terminal, because the terminal is a half-duplex communication terminal, the modulated data signal from the modulator/demodulator on one terminal side will be received by the other terminal. Normally, only when the modulator/demodulator detects that there is no carrier, the signal is transmitted to the other terminal side.

In this way, in a digital data exchange network, envelope signals are used to communicate data between terminals, while in a telephone network, data is communicated between terminals using modulated data signals. It is designed to do the following.

Therefore, if the data exchange of the digital data exchange network and the telephone exchange of the telephone exchange network are connected via a transmission path, mutual data communication between the terminals of the digital data exchange network and the terminals of the telephone exchange network is limited to this. In fact, no inter-network communication system capable of performing such mutual data communication has been proposed in the past.

Therefore, it is an object of the present invention to propose a new inter-network connection communication method that enables mutual data communication between terminals of a digital data exchange network and terminals of a telephone exchange network with a simple configuration, and will be described in detail below. It will become clearer from now on.

FIG. 1 shows an example of an inter-network connection communication system according to the present invention, which includes a digital data exchange network 1 in which a terminal can be used as a full-duplex or half-duplex communication terminal, and a digital data exchange network 1 in which a terminal can be used as a half-duplex communication terminal. It has a telephone switching network 2 and an inter-network connection device 3 that can be inserted between the digital data switching network 1 and the telephone switching network 2.

When transmitting digital data from one terminal 11 to another terminal (not shown), the data exchange network 1 transmits the data from the terminal 11 to a circuit terminating device 12.
The envelope is composed of 6 data bits as shown in FIG. 2, and one F bit as a synchronization bit and one S bit as a control bit are arranged before and after the data bits, respectively. The signal is converted into a signal and transmitted to other terminals via the digital data exchanger 13 and a digital transmission line (not shown), and conversely, the line termination device 12 for the terminal 11 connects the terminal to the other terminal. The envelope signal is sent to the data exchanger 13 via a digital transmission path.
When receiving the signal via the line terminal device 12, the envelope signal is converted into digital data,
Although the terminal 11 is configured to accept this data, the data DS from the terminal 11 is transferred to the telephone switching network 2.
When transmitting to the side, the line terminating device 12 obtains "an envelope signal ES1 that sets the contents of the S bit to, for example, 1" and the contents of the data bits to, for example, all "1", and transmits this to the data. It is sent to the inter-network connection device 3 side via the exchange 13 and the digital transmission line 14, and then the line termination device 12 converts the contents of the S bit to ``1'' and the contents of the data bit to the data from the terminal 11. The envelope signal ES2 which is the content of the DS is obtained, and this is sent to the exchange 13 in the same way.
and the transmission line 14 to the network connection device 3 side, and the data from the terminal 11 is
If the DS is not to be sent to the telephone switching network 2 side, the line termination device 12 sends an envelope signal ES3 that sets the contents of the S bit to ``0'' and the contents of the data bits to a predetermined value such as ``1''. This is then sent to the inter-network connection device 3 side.

Furthermore, when transmitting digital data from one terminal 21 to another terminal (not shown), the telephone switching network 2 modulates the data from the terminal 21 with carrier data using a modem 22. The modulated data signal is converted into a modulated data signal having a mode as shown in FIG. transmits the modulated data signals from other terminals through the analog transmission line and the telephone exchange 23.
When receiving data via a data exchange network, the modulator/demodulator 22 converts the modulated data signal into digital data, and the terminal 21 receives the digital data. 1 side, the modulator 22 obtains the carrier C1, sends it to the network connection device 3 side via the telephone exchange 23 and the analog transmission path 24, and then transmits it to the network connection device 3 side via the modulator 22. data D
Obtain a modulated data signal MS modulated by
Similarly, this is transmitted via the telephone exchange 23 and the transmission line 24.
The data D from the terminal 21 is sent to the inter-network connection device 3 side via the data exchange network 1.
If not sent to the terminal 11 side, no carrier CO
(There is no carrier or any other signal) is sent to the inter-network connection device 3 side.

Furthermore, the inter-network connection device 3 receives the envelope signal ES1 sent from the data exchange network 1 side to the device 3 side via the transmission path 14 in the reception separation circuit 31, and in this circuit 31, the envelope signal ES1 is received.
detects that the S bit of is "1", receives the detection output S1 in the modulation circuit 32, obtains a carrier CD in this circuit 32, and transmits it via the hybrid circuit 33 and the analog transmission line 24. The envelope signal ES2 is sent to the telephone exchange network 2 side via the transmission line 14, and the envelope signal ES2 is similarly sent to the device 3 side via the transmission line 14. The data bits of ES2 are separated, the data bits are received by the modulation circuit 32, and the modulated data signal MSD modulated by the carrier data bits is obtained from this circuit 32, and this is sent to the hybrid circuit 3.
3 and the transmission path 24 to the telephone switching network 2 side, and further sent to the device 3 side through the transmission path 14, the reception separation circuit 31 receives the envelope signal ES3. The circuit 31 detects that the S bit of the envelope signal ES2 is "0" and sends the detection signal S3 to the modulation circuit 32.
No carrier is received in this circuit 32.
CD0 (no carrier or any other signal)
is obtained and sent to the telephone switching network 2 side. Also, carrier C1 is sent to the device 3 side via the analog transmission line 24 from the telephone switching network 2.
is received by the demodulation circuit 34 via the hybrid circuit 33, the presence of the carrier C1 is detected from this, and the detection output CD2 is received by the envelope assembly circuit 35, which then outputs the signal "S bit". The envelope signal ES4 is made to have a predetermined content such that the content is "1" and the content of the data bits are all "1", and this is sent to the digital switching network 1 side via the digital transmission path 15,
Similarly, the modulated data signal MS from the switching network 2 is received by the demodulation circuit 34 via the hybrid circuit 33, and a data signal D' obtained by demodulating the modulated data signal MS is obtained. The envelope assembly circuit 35 obtains "an envelope signal ES5 that makes the contents of the S bit "1" and the contents of the data bits the contents of data D', and sends this to the data exchange network 1 side via the transmission line 15. Furthermore, the demodulation circuit 34 receives the non-carrier CO from the switching network 2, and from this the non-carrier CO
Based on this, the assembly circuit 35 sets the contents of the S bit to "0",
An envelope signal ES6 which sets all the data bits to ``1'' is obtained and sent to the switching network 1 side.

The above is an example of the configuration of the inter-network connection communication system according to the present invention.According to such a configuration, although a detailed explanation thereof will be omitted, since it has the above-mentioned configuration, it is possible to connect the terminal 11 of the digital data conversion network 1. The data DS obtained by the terminal 21 of the telephone switching network 1 can be received via the inter-network connection device 3 at the terminal 21 of the telephone switching network 1, and conversely, the data D obtained at the terminal 21 of the telephone switching network 2 can be received by the terminal 21 of the telephone switching network 2 via the inter-network connection device 3. Digital data exchange network 1 via device 3
, and when it transmits the data DS from the terminal 11 of the data exchange network 1 to the terminal 21 of the telephone exchange network 2, the data exchange network 1
Whether the S bit of the envelope signal from the side is "1" or "0" corresponds to the presence or absence of a carrier to the telephone switching network 2 side, and data D is exchanged from the terminal 21 of the telephone switching network 2. When transmitting to the terminal 11 of network 1, whether or not there is a carrier from the telephone switching network 2 side is made to correspond to "1" or "0" of the S bit of the envelope signal to the data switching network 1 side. Terminal 2 on the telephone exchange network 2 side
Even if 1 is a half-duplex communication terminal, data communication between the terminal 11 of the data exchange network 1 and the terminal 21 of the telephone exchange network 2 can be achieved without excess or deficiency, and such data communication can be performed with a simple configuration. It has the great feature that it has been made.

The above description merely shows an example of the present invention, and various modifications and changes may be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of an inter-network connection communication system according to the present invention, and FIG. 2 is a diagram explaining an envelope signal format. In Figure 1, 1 is a digital data exchange network;
11 is a full-duplex communication terminal, 12 is a line termination device,
13 is a digital data exchange, 2 is a telephone switching network, 21 is a half-duplex communication terminal, 22 is a modem,
23 is a telephone exchange, 3 is an inter-network connection device, 31 is a reception separation circuit, 32 is a modulation circuit, 33 is a hybrid circuit, 34 is a demodulation circuit, and 35 is an envelope assembly circuit.

Claims (1)

[Scope of Claims] 1. A digital data exchange network using envelope signals that makes a terminal a full-duplex communication terminal or a half-duplex communication terminal; a telephone switching network that makes a terminal a half-duplex communication terminal; It has an inter-network connection device that can be inserted between a data exchange network and the telephone exchange network, and the digital data exchange network transmits digital data from the terminal for full-duplex communication or half-duplex communication to the telephone exchange network. When transmitting to a half-duplex communication terminal, an "envelope signal that sets the content of the S bit to 1 (or 0) and the content of the data bit to a predetermined content" is sent to the network connection device. Then, it sends an "envelope signal that sets the contents of the S bit to "1" (or "0") and the contents of the data bits to the contents of the above digital data" to the above-mentioned network connection device, and transmits the above-mentioned full-duplex When not transmitting digital data from a communication or half-duplex communication terminal to a half-duplex communication terminal on the telephone exchange network, set the contents of the S bit to ``0'' (or ``1'') and the contents of the data bit to a specified value. The telephone exchange network transmits the data from its half-duplex communication terminal to the digital data exchange network for full-duplex communication or half-duplex communication. When transmitting to a terminal, the carrier is sent to the above-mentioned inter-network connection device, and then the modulated data signal modulated by the above-mentioned data of the carrier is sent to the above-mentioned inter-network connection device side, and the half-duplex When the communication terminal does not transmit data to the full-duplex communication or half-duplex communication terminal of the digital data exchange network, a non-carrier is sent, and the network connection device transmits the data from the digital data exchange network. Based on the ``envelope signal that sets the contents of the S bit to ``1'' (or ``0'') and the contents of the data bits to a predetermined value, the carrier is sent to the above-mentioned telephone exchange network, and the data from the above-mentioned digital data exchange network is transmitted. Based on the above-mentioned "envelope signal that makes the content of the S bit "1" (or "0") and the content of the data bit the content of the digital data,
A modulated data signal modulated with the content of the digital data of the carrier is sent to the telephone switching network, and the content of the S bit from the digital data switching network is set to "0" (or "1"). ),
Based on the "envelope signal that makes the content of the data bits a predetermined content," a non-carrier is sent, and based on the carrier from the telephone exchange network,
Sends "an envelope signal that sets the content of the S bit to "1" (or "0") and the content of the data bit to a predetermined content" to the digital data exchange network side,
Based on the modulated wave data signal from the telephone switching network, set the contents of the S bit to ``1'' (or ``0''),
An envelope signal that makes the contents of the data bits the contents of data obtained by demodulating the modulated wave data signal is sent to the digital data exchange network side, and based on the non-carrier from the telephone exchange network,
An inter-network connection communication system characterized in that an "envelope signal that sets the S bit to "0" (or "1") and the data bit to a predetermined content" is sent to the digital data exchange network side. .