JPS6217436B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data/voice mixed transmission system when terminals equipped with data communication functions and voice communication functions are accommodated in a digital network that connects subscriber terminals with digital information. be.

Conventionally, it has been common to use telephone networks primarily for voice and data communications. This telephone network was mainly a so-called analog network that connected 4KHz analog signals from subscriber terminals to the other party's terminals. In such analog networks, the common method is to modulate digital signals such as data communications into analog signals within 4KHz at a terminal and demodulate at the other party's terminal.

On the other hand, communication using such an analog network is called PCM.
There is a trend to digitize analog signals within the network using digital technology and digital ICs, and to perform analog communication through digital networks. By introducing such digitization technology to subscriber terminals, the analog signals of the terminals are digitized at the terminals, and the digital signals at the terminals can be connected to the digital network as they are.

In other words, the audio signal (analog signal) is digitized at the terminal, and the data signal (digital signal) can be directly converted into a digital signal and communicated through a digital network (data/audio composite communication).

The present invention provides an effective transmission method in such data/voice composite communication.

FIG. 1 is an example of a conventional digital terminal-to-exchange and terminal-to-terminal transmission signal, and FIG. 2 is a time chart of FIG. 1.

In Figure 1, F is the envelope synchronization bit;
S indicates a status bit, and _D0 to _D5 indicate communication information bits.

The conventional transmission method will be explained below. Figure 1 is mainly used for data communication, and information is communicated in units of one envelope, which consists of one envelope synchronization bit and n bits for communication and network control. As shown in the figure, if n=7, 6 bits out of n-1 bits are communication information D ₀ to D ₅ , the nth bit indicates status information, and S bit is S = 0, D ₀ to _{D 5} . indicates communication information with the other party's terminal, and when S=1, D ₀ to _{D 5}
indicates that this is a network control signal communicated between the exchange and the terminal.

Figure 2 shows the envelope S in the above conventional example.
This is a time chart showing an example of the status of bits and _D0 to _D5 , and shows information from the terminal to the exchange and from the exchange to the terminal, respectively. In each transmission form, communication information is determined by the state of the S bit.
The contents of D ₀ to _{D 5} change and become communication information or control information.

The problem with using the transmission method shown in Figure 2 is that, for example, if a third terminal receives a call from the previous terminal during communication between terminals, it is difficult to transmit information to the previous terminal. It is necessary to set the S bit to 1, which may disturb communication between terminals.

It is an object of the present invention to solve the above-mentioned drawbacks, and to provide a function of a subscriber line signaling system that notifies subscribers of the status of an exchange when performing data/voice composite communication, and a signaling system for performing data/voice composite communication service. The object of the present invention is to provide a mixed data/voice transmission system between a terminal and an exchange, which includes the following functions.

In order to achieve the above object, the present invention provides a digital subscriber system that communicates between a terminal having a data communication function and a voice communication function and an exchange in an envelope unit consisting of 1 bit for envelope synchronization and n bits for communication and network control. By using only one specific bit out of the n bits in the envelope to form a predetermined block across multiple envelopes, the terminal transitions to a state of communication with the other terminal between the terminal and the exchange. , information for the terminal to go into a non-communication state, and information to be exchanged with the exchange while the terminal is communicating with the other terminal, and data between terminals or It is characterized by transmitting a mixture of voices.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is an example of the data/voice mixing method according to the present invention, FIG. 5 is an explanatory diagram of how to use the S' bit shown in FIG. 3, and FIG. 6 is an explanation of the data/voice mixed transmission method according to FIG. 3. FIG. 2 is a diagram of a relay system between a terminal and an exchange.

In Figure 3, F is envelope synchronization information,
D ₀ to _{D 5} indicate communication information and indicate the same information as shown in the conventional example shown in FIG. 1, but S' is different from S in the conventional example shown in FIG. Represents all information conversion required between switches. That is, 1. All information for the terminal to transition to a communication state with the partner terminal. 2. All information for the terminal to transition to the non-communication state. 3. Information exchanged between the terminal and the exchange while communicating with the partner terminal. Information for exchanging D ₀ to _{D 5} are data exclusively used between terminals,
It is used for mixed voice transmission and is not used for information conversion between terminals and exchanges.

By using such a mixed transmission system, data and voice signals between terminals can be used as a network with constant transparency.

Next, an example of how to use the S bit according to the present invention shown in FIG. 3 will be explained with reference to FIG.

FIG. 5 is an example of how to use the S bit shown in FIG. 3, and describes the continuity of the envelope in the vertical direction. We show that a series of S' bits can provide significant information from the terminal to the exchange and from the exchange to the terminal, with one block consisting of multiple bits surrounded by start bits (ST) and stop bits (SP). There is.

In this example, the above one block consists of 9 bits.
The S' bit is used, and the 7 bits excluding the ST and SP bits represent the information necessary between the terminal and the exchange, including the transfer of incoming call information.

FIG. 4 shows another embodiment according to the invention. Fourth
Information _S1 for identifying whether the contents of _D0 to _D5 are data signals or audio signals is added to the transmission signal information according to the illustrated embodiment. For example, when S ₁ = 0
D ₀ to D ₅ indicate data information, and when S ₁ = 1, D ₀
~ _D5 indicates audio information. According to the embodiment shown in FIG. 4, by using the _S0 bit and _S1 bit to perform data communication between terminals only when there is no voice information (in the case of silence), data and voice simultaneous communication service is also possible. It becomes possible. Also in Figure 4
It is also possible to configure a configuration in which the information conversion between the exchange and the terminal is controlled as a procedure during data communication with S ₀ = 0 using only the S ₀ bit without using the S ₁ bit.

FIG. 6 is a diagram of a relay system between a terminal and an exchange illustrating the mixed data/voice transmission system shown in FIG. Generally, in networks providing voice services, it is effective to notify subscribers as a tone signal to indicate the status of the exchange (for example, an incoming call from a third party during a call). According to FIG. 6, when an exchange receives an incoming call from a third party to the terminal during communication between the terminals, the exchange uses the S' bit to display the status of the exchange (a call from a third party during a call). (incoming call display) is transmitted to the terminal using a digital pattern signal. When the terminal receives the pattern signal, a signal transmitter (OSC) installed on the terminal side converts it into a tone signal and notifies it to the terminal's telephone. In such a configuration, the terminal as explained in FIG.
There is no day-staging of communications between devices.

On the other hand, FIG. 7 shows another embodiment different from the transmission system of the display signal of the exchange status shown in FIG. It is a system diagram. 7th
According to the figure, when an exchange receives an incoming call from a third party to the terminal while the terminals are communicating, the exchange monitors a specific bit _S1 on the envelope and stops the communication between the terminals. It is used as a means to identify whether it is a data communication or a voice communication, and if it is a voice communication, to notify the terminal of the status of the exchange (indication of an incoming call from a third party during a call). Status display information about the status of the exchange is digitally combined with the n-2 bit signals D ₀ to _{D 5} in use and transmitted to the terminal. According to FIG. 7, the signal generator (OSC) for transmitting tone signals can be commonly installed in the exchange, and various tone signals can be prepared. Even in such a configuration, communication between terminals is not destarved as explained in FIG. 1.

As explained above, according to the present invention, data
When performing composite voice communication, it has become possible to use a network that is always transparent, and it has become possible to realize a combined data and voice transmission system using a digital switching network that includes subscriber lines.

[Brief explanation of the drawing]

FIG. 1 is an example of a digital transmission signal using the conventional data/audio mixed transmission system, FIG. 2 is a time chart of FIG. 1, and FIG. 3 is a data/voice transmission signal according to the present invention.
FIG. 4 is an example of a digital transmission signal using a mixed audio transmission method, which is another embodiment of the present invention, and FIG. 5 is an example of a digital transmission signal using a mixed audio transmission method according to the present invention. An explanatory diagram of how to use it. Figure 6 is a relay system diagram between a terminal and an exchange explaining the data/voice mixed transmission system shown in Figure 3. Figure 7 is a diagram of the data/speech mixed transmission system shown in Figure 4.
FIG. 3 is a diagram of a relay system between a terminal and an exchange, explaining a voice mixed transmission system. F...Envelope synchronization bit, S', _S0 , _S1 ...
...Status bit, _D0 to _D5 ...Communication information bit,
OSC...Talking signal generator.

Claims (1)

[Claims] 1. Using a digital subscriber line that communicates between a terminal having a data communication function and a voice communication function and an exchange in an envelope unit consisting of n bits,
Information between a terminal and an exchange for allowing the terminal to enter a state of communication with the other terminal by forming a predetermined block across multiple envelopes using only one specific bit among the n bits in the envelope; The terminal communicates information for transitioning to a non-communication state and information to be exchanged with the exchange while the terminal is communicating with the other terminal, and the other n-1 bits are used to
A data/audio mixed transmission method characterized by transmitting data or voice between terminals. 2 A digital subscriber line is used to communicate between terminals with data and voice communication functions and exchanges in envelope units consisting of n bits, and only one specific bit of the n bits in the envelope is used. By forming a predetermined block across multiple envelopes, information is provided between the terminal and the exchange to enable the terminal to enter a state of communication with the other party's terminal, information for the terminal to enter a state of no communication, and information for the terminal to enter a state of communication with the other party's terminal. Communicate information to be exchanged with the exchange during communication, and use a specific 1 bit among the other n-1 bits, and use the remaining envelope information (n-2 bits) as information for data communication. A data/audio mixed transmission system characterized by displaying information identifying whether the information is for voice communication or for voice communication. 3. A digital subscriber line is used to communicate between a terminal with data communication function and voice communication function and an exchange in an envelope unit consisting of n bits, and only one specific bit of the n bits in the envelope is used. By forming a predetermined block across multiple envelopes, information is provided between the terminal and the exchange to enable the terminal to enter a state of communication with the other party's terminal, information for the terminal to enter a state of no communication, and information for the terminal to enter a state of communication with the other party's terminal. It communicates the information to be exchanged with the exchange during communication, and uses one specific bit among the other n-1 bits to use the remaining envelope information (n-2 bits) as information for data communication. If the communication is voice communication, it synthesizes the signal tone from the exchange with the n-2 bit signal used between terminals. A mixed data and audio transmission method.