JP2908038B2 - Extension communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extension communication system used for extension communication between terminals in the same house in ISDN, for example.

[0002]

2. Description of the Related Art A user / network interface in ISDN (Integrated Services Digital Network) is constructed in accordance with the provisions of CCITT Recommendation I / 400. Among them, ISDN terminals
It is connected to the network via a network termination device having a layer 2 and layer 3 termination function. Layer 2 defines the function of each unit for transferring data. Layer 3 defines the function of each unit for performing call control. Network terminator and ISDN
The connection point with the terminal is positioned as the S / T point.
This S / T point is a reference point in the user / network interface of the basic interface. A plurality of ISDN terminals can be connected to this S / T point by bus connection. The network termination device and the ISDN terminal are connected by a 2B + D channel.

Conventionally, when a plurality of terminals perform communication between terminals in the same house connected to one network terminating device, that is, when so-called extension communication is performed, the following is performed. Was.

[0004] When a communication request is issued from a certain terminal to another terminal, the terminal sends a call setup message to the network via the network terminating device as in the case of the line communication. In this call setup message, for example, a request for using the B1 channel as a used channel, a station number for designating a destination terminal (in this case, the own station number), a subaddress of the destination terminal, etc. Are added as information elements.

[0005] The network receives this call setup message,
The called terminal is recognized based on the information elements therein, and a call setup message is transmitted to the partner terminal via the network terminating device. In the call setup message, for example, an information element such as B2 channel assignment is added. At this time, the network sends a call setup acceptance message to which information elements such as B1 channel assignment are added to the calling terminal.

[0006] The called terminal receiving the call setup message,
The call setup acceptance message is returned to the network via the network terminating device, and then the call message is sent to the network. The network receiving the call message from the called terminal sends the call message to the calling terminal.

[0007] Thereafter, when the called terminal is a telephone, for example, if the call is answered off-hook or the like, the called terminal sends a response message to the network. The network receiving this response message sends a response message to the calling terminal and returns a response confirmation message to the called terminal. Thus, after the response confirmation message is transmitted and received between the calling terminal and the network, communication is performed between the two terminals via the network. At this time, the communication fee is charged in the network.

[0008] When the communication is completed, for example, a disconnection message is sent from the calling terminal to the network, and upon receiving the message, the network returns a release message to the calling terminal and further sends a release message to the called terminal. Sends a disconnect message. The called terminal that has received the disconnection message sends a release message to the network, and the network that has received the message returns a release completion message to the called terminal. The calling terminal receiving the release message from the network returns a release complete message to the network. When transmission / reception of the release completion message is completed between the network and both terminals, the call is released and charging ends at the same time.

[0009]

However, since extension communication is performed within a short distance and within the same house, the communication may be frequently performed. However, as described above, conventional extension communication between in-home terminals is all performed on the same external line communication path as that of general office line communication via a network. Regardless, the signal is transferred to the terminal in the same house via the subscriber transmission path and further via the exchange of the network.

Therefore, there has been a problem that the line use efficiency is poor. In addition, there is a problem that the internal processing of the exchange in the network is increased, and the processing efficiency is deteriorated.
Further, when an abnormality such as a line accident or failure occurs on the network side, there is a problem that extension communication cannot be performed even though there is no abnormality in the house.

The present invention solves the above-mentioned drawbacks of the prior art, and can process communication between terminals in the same house without performing the communication via a network. Therefore, it is possible to improve the line use efficiency. It is another object of the present invention to provide an extension communication system between home terminals which can reduce the load on a network and can perform extension communication even when an abnormality occurs on the network side.

[0012]

SUMMARY OF THE INVENTION According to the present invention, in order to solve the above-mentioned problem, a home transmission line having a plurality of sockets is accommodated in a network terminator having a terminating function on a subscriber side of a communication network. An extension communication system for performing external line communication via an in-home transmission line and performing extension communication between the same in-home terminals at a plurality of terminals connected via the socket of the in-home transmission line. The extension communication system includes an extension communication path for extension communication, which is separate from an exterior communication path connected to a communication network from a home transmission line via a network terminator, and the extension communication path includes an extension communication path. Extension line for transmitting a signal for internal communication, and a terminal connected between the socket of the home transmission line and each terminal for branching the signal for extension communication to the extension line without sending the signal to the home transmission line. Additional equipment Performs a process extension signal transmitted by extension transmission line, and a extension communication processing apparatus for performing call connection control of the extension communication between the home terminal.

[0013] In this case, the terminal addition device includes a switching means for selectively switching one of the extension communication path and the outside communication path, and a start of the extension communication or the outside communication based on a signal transmitted and received from the terminal. Means for identifying
When the extension communication is performed based on the identification result of the identification means, the switching means is connected to the extension transmission path, and when the extension communication is completed, the control means disconnects the switching means and connects to the external communication path. It is characterized by having.

[0014] The extension transmission line comprises an extension transmission line laid in the house. The extension transmission line includes a plurality of connection terminals respectively connected to empty terminals of a socket of the house transmission line. The terminal is connected to an unoccupied terminal of the in-home transmission line, so that the terminal is connected to the terminal additional device via the unoccupied terminal of the socket.

Further, in this case, the electrical connection between the extension transmission line and the extension communication processing device and the electrical connection between the extension transmission line and the terminal addition device are established by transformer coupling of the transmission line and the reception line. Due to these transformer couplings, at the time of extension communication between in-home terminals, communication power supplied to the power supply circuit of the extension communication processing device is transmitted from the transmission line and the reception line of the extension transmission line to the respective terminals via the terminal addition device. It is supplied to the terminal.

On the other hand, instead of the extension transmission line as an extension transmission line, the terminal addition device and the extension communication processing device are provided with a radio transmission unit and a radio reception unit, respectively. , An extension transmission line is formed by the wireless transmission line.

In this case, a power supply line is provided between the extension communication processing device and the terminal addition device, and the wireless transmission means and the wireless reception means of each terminal addition device are connected to the extension via the power supply line. Communication power is supplied from a power supply circuit provided in the communication processing device.

[0018]

According to the extension communication system of the present invention, a terminal addition device is provided between a plurality of extension terminals and a home transmission line in the same house.
When communication is performed in each terminal, the signal is distributed to an internal communication path or an external communication path, and communication is performed.
In this case, the terminal addition device is provided with a switching means, and when performing the extension communication, the switching means switches to the extension communication path including the extension communication processing device, thereby transmitting the signal by the extension communication to the home transmission line and the network. The extension communication is performed via the extension communication path dedicated to the extension without transmitting to the network via the terminating device.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an extension communication system according to the present invention will be described in detail with reference to the accompanying drawings.

First, in order to facilitate understanding of the present invention, a basic user-network interface in ISDN shown in FIG. 8 will be described. In FIG. 1, a network terminating device 12 has a network terminating function of a subscriber transmission line 100 accommodated in a local exchange (XN) 14. A network termination unit (DSU) 12 accommodates the home transmission line 10. The in-home transmission line 10 has a four-wire bus configuration including an up line L1 and a down line L2. This home transmission line 10 has sockets CN0 at predetermined positions, respectively.
~ CNn. Terminals TE1 to TEn are connected to these sockets CN0 to CNn. The communication of each extension terminal is performed using information channels B1 and B2, a signal channel D, and a contention control channel E set on the home transmission line 10. In this case, the information messages sent from the terminals TE1 to TEn are all transmitted through the subscriber transmission line 14 and the
Had to be sent to another extension terminal.

Therefore, in this embodiment, communication between extension terminals is performed via the extension communication adding device 20 as shown in FIG. 1 without passing through the home transmission line 10 and the network. A first embodiment of an extension communication system according to the present invention to which the extension communication adding device 20 is applied will be described with reference to FIG.

The extension device 20 in this embodiment includes terminal extension devices 201 to 20n connected between the in-home transmission line 10 and the terminals, respectively, and an extension transmission line for connecting these terminal extension devices 201 to 20n. 26, and an extension communication processing device 22 connected to the extension transmission line 26. The terminal addition devices 201 to 20n, the extension transmission line 26, and the extension communication processing device 22 form an extension communication channel.

Each of the terminal addition devices 201 to 20n has eight terminals connected to the sockets CN0 to CNn of the in-home transmission line 10, respectively. Of these, four terminals are connected to the upstream line L1 and the downstream line L2 of the in-home transmission line 10, and the remaining four terminals are connected to empty terminals of the sockets CN0 to CNn, respectively. On the other hand, each of the terminal addition devices 201 to 20n has a socket CNa on the terminal side to which each of the terminals TE1 to TEn is connected. 4 of this socket CNa
Switches S1 and S2 are provided between the connection lines and the connection lines connected to the eight terminals, respectively. The switches S1 and S2 are switching means for switching between the in-home transmission line 10 and the four lines connected to the vacant terminals to connect to the four lines connected to the terminal.

The extension transmission line 26, like the home transmission line 10,
It is formed in a four-wire bus configuration including an up line L3 and a down line L4. The up line L3 and the down line L4 are respectively connected to vacant terminals of the sockets CN0 to CNn of the socket premises transmission line 10. Note that terminating resistors R are attached to both ends of the extension transmission line 26, respectively.

The extension communication processing device 22 is connected to one end of the extension transmission line 26 via a transformer coupling. The extension communication processing device 22 is a switching circuit that takes in or transfers signals transmitted on the up line L3 and the down line L4 to the extension processing circuit 24 via the amplifier A, and performs call connection processing between terminals. is there.

With the above configuration, for example, when a request for extension communication is made from the terminal TE1 to another terminal TEn, the switches S1 and S2 of the terminal addition devices 201 and 20n are switched to the extension transmission line 26 side. In this state, the terminal TE1 sends a call setup message in the extension communication from the terminal addition device 201 to the extension communication processing device 22 via the extension transmission line 26. In this call setup message, for example, a request for using the B1 channel as a used channel and a sub-address of the terminal TEn for designating the terminal of the destination are added as information elements.

The communication processing device 24 receives the call setup message, recognizes the called terminal TEn by the information element therein, and sends the call setup message to the partner terminal TEn via the terminal addition device 20n. I do. In the call setup message, for example, an information element such as B2 channel assignment is added. At this time, the extension communication processing device is the calling terminal TE.
Sends a call setup acceptance message with information elements such as B1 channel assignment added to 1.

The called terminal TEn that has received the call setup message
Returns a call setting acceptance message to the extension communication processing device 24 via the terminal addition device 20n, and subsequently sends a call message to the extension communication processing device 24. Called terminal
Extension communication processor 24 receiving the call message from TEn
Sends a call message to the calling terminal TE1.
Thereafter, if the called terminal TEn is, for example, a telephone, and responds off-hook or the like, the called terminal TEn sends a response message to the extension communication processing device 24. The extension communication processing device 24 that has received the response message sends a response message to the calling terminal TE1, and further returns a response confirmation message to the called terminal TEn. As described above, after the response confirmation message is transmitted and received between the calling terminal and the extension communication processing device 24, communication is performed between the two terminals via the extension passage.

When the communication is completed, for example, the calling terminal sends a disconnection message to the extension communication processing device 24, and the extension communication processing device receiving this sends a release message to the calling terminal TE1. And the called terminal TEn
Sends a disconnect message. The called terminal TEn that has received the disconnection message sends a release message to the extension communication processing device 24, and the extension communication processing device 24 that has received the message returns a release completion message to the called terminal TEn. The calling terminal TE1 receiving the release message from the network returns a release completion message to the extension communication processing device 24. When the extension communication is completed, the switches S1 and S2 of the terminal additional devices 201 and 20n are returned to the home transmission line 10 to terminate the extension communication.

As described above, in the present embodiment, when extension communication is performed, each of the terminals TE1 to TEn is connected to the terminal addition device 201 to TEn.
By switching the 20n switches S1 and S2 to the extension transmission line 26 side to perform communication, signals from extension
It can be transmitted only at home without sending it to the 10 side. Therefore, signals from the extension communication are transmitted to the network terminating device 12.
Since the ISDN line can be used only for OIC communication without sending the signal to the subscriber transmission line 100 via the OLT, the use efficiency can be improved. Further, the internal processing of the local exchange 14 in the network can be reduced, and the processing efficiency can be dramatically increased. Furthermore, even if an abnormality such as a line accident or a failure occurs on the network side, extension communication can be performed at any time if there is no abnormality in the house.
Further, in this embodiment, the extension adding device 20
When inserting into the basic interface of ISDN, terminal TE1
Since the connection with .about.TEn and the transmission line are all performed by socket connection, the installation can be easily realized.

FIG. 2 is a block diagram showing a second embodiment according to the present invention. This embodiment differs from the configuration of FIG. 1 in that the terminal addition devices 301 to 30n of the extension communication addition device 30 are used to automate the switching between the extension communication and the outside line communication.
In addition, a mixing circuit (MIX) 32 and a switch control circuit (CONT) 34 are provided.

The mixing circuit 32 is connected to the input / output side of the extension terminal TE via the switches S1 and S2. This mixing circuit 32
Monitors a signal received by a terminal and distinguishes an external line connection signal and an extension line connection signal. When the connection of the extension system is established, the switch control circuit 34 is notified. Switch control circuit
When receiving the notification from the mixing circuit 32, the switches S1 and S2
Is transmitted. As a result, the extension terminal TE
1 to TEn are connected to the extension transmission line 26. As a result, extension communication is automatically performed by the extension communication adding device 20. When the extension communication ends, the mixing circuit 32 notifies the switch control circuit 34 of the restoration of the switches S1 and S2. As a result, the switch control circuit 34 sends a signal for restoring the switches S1 and S2, and the switches S1 and S2 are restored to the home transmission line 10 as shown in the figure.

FIG. 3 shows an embodiment of a communication power supply system in an extension communication system according to the present invention. In the extension communication addition device 40, a terminal power supply circuit (PS) for supplying communication power to the center taps of the line transformers of the extension communication processing device 42 and the terminal addition devices 401 to 40n.
X) 420 and (PSi) 422 are connected. The power supply circuit 420 of the extension communication processing device 42 is supplied with power from a main power supply (PWIN). Therefore, in this embodiment, at the time of extension communication, power is supplied from the power supply circuit 420 of the extension communication processing device 42 to the terminal addition devices 401 to 40n via the extension transmission line 26, and furthermore, the power supply of the terminal addition devices 401 to 40n is Supply circuit 422
The power is supplied to the terminal via. Although the present power supply system has been described by taking as an example the case where the present invention is applied to the extension communication system shown in FIG. 1, it can be similarly applied to the second embodiment shown in FIG.

FIG. 4 shows a fourth embodiment of the extension communication system according to the present invention using a radio system for the extension communication path. In this figure, the extension communication adding device 50 has an extension communication processing device 52 and terminal adding devices 501 to 50n. The terminal addition devices 501 to 50n in this embodiment have a radio transmission circuit (TX) and a radio reception circuit (RX), respectively, and transmit radio waves of different transmission / reception frequencies f1a, f1b to fna, fnb to antennas (A
NT) to transmit and receive extensions. The selection between the extension communication and the outside line communication is performed by manually switching the switches S1 and S2.

The extension processing unit 52 in this embodiment comprises N sets of transmission circuits (TX1 to TX1) corresponding to the terminal addition units 501 to 50n.
TXn) and receiving circuits (RX1 to RXn) and their antennas (A
NT) and the extension communication processing circuit (SX) 54 connected to the transmission / reception circuit
It has. The extension communication processing circuit 54 receives an extension signal transmitted from the terminal addition device 501 to 50n by the reception circuit (RXi) when performing extension communication, and
(TXj) to perform an extension connection exchange connection.

FIG. 5 is a circuit diagram showing a fifth embodiment of the extension communication system using wireless packets according to the present invention. In this figure, the extension communication adding device 60 has an extension communication processing device 62 and terminal adding devices 601 to 60n. 4 is different from the embodiment of FIG. 4 in that the transmitting circuit (TX) and the receiving circuit (RX) of the terminal additional devices 601 to 60n share an antenna (ANT) with one antenna. Container (F
L) is connected, and a radio transmission processing circuit (TPC) for encoding the MCA scheme and packet transmission and a radio reception processing circuit (RPC) for decoding the received wave are provided in front of the transmission / reception circuit. ) Is connected. Similarly,
The extension communication processing device 62 also includes a duplexer (FL), a wireless transmission processing circuit, and a wireless reception processing circuit.

With the above configuration, when performing extension communication, if the switches S1 and S2 are manually switched to the wireless side, the extension communication is performed by wireless packets.

FIG. 6 is a diagram showing a sixth embodiment in which switching between external line communication and internal line communication is automated in the embodiment of FIG. In this figure, the extension communication adding device 70
Are the extension communication processing device 72 and the terminal addition devices 701 to 70n
Are provided. The wireless transmission processing circuit (TPC) of each of the terminal addition devices 701 to 70n performs control to automatically switch the switches S1 and S2 to the wireless side when detecting a signal by extension communication, and switches S1 and S2 when detecting the end of communication. It has a switch control function to perform control for restoring.

FIG. 7 is a circuit diagram showing a seventh embodiment in which a power supply circuit is added to the embodiment of FIG. In this figure, the extension communication processing device 82 includes a common power supply circuit (PSX) 85. The terminal addition devices 801 to 80n are configured to receive power from the common power supply circuit (PSX) 84 to the power supply circuit (PS) through the power supply line 86 and the empty terminals of the sockets CN0 to CNn. In addition, the terminal additional devices 801 to 80n
The power supply circuit PS also supplies power to terminals.

[0040]

According to the extension communication system of the present invention as described above, the following effects can be obtained. 1. By adding an extension communication path to ISDN terminals, IS
Extension communication without passing through the DN can be realized. In this case, when the number of terminals is large, the load of the ISDN is significantly reduced, and the communication of the ISDN is significantly improved. 2. Since it is configured with the same socket connection as the conventional basic interface, the terminal and the present system can be easily connected. In this case, it is possible to connect the ISDN and the transmission path of the present system to the power supply using the empty terminal of the socket of the in-home transmission line that has been laid in advance, so that the introduction of the present system can be further facilitated. 3. If the wireless system is used, the construction of the extension transmission line becomes unnecessary and the installation work becomes extremely simple.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment of an extension communication system according to the present invention.

FIG. 2 is a circuit diagram showing a second embodiment according to the present invention in which an automatic extension switching function is added to the first embodiment;

FIG. 3 is a circuit diagram showing a third embodiment according to the present invention in which a communication power supply is added to the first embodiment.

FIG. 4 is a circuit diagram showing a fourth embodiment according to the present invention.

FIG. 5 is a circuit diagram showing a fifth embodiment according to the present invention in which extension communication is performed by wireless packets.

FIG. 6 is a circuit diagram showing a sixth embodiment according to the present invention for automatically selecting extension communication.

FIG. 7 is a circuit diagram showing a seventh embodiment according to the present invention to which a wireless power supply is added.

FIG. 8 is a circuit diagram for explaining a basic interface of a user / network interface in ISDN.

[Explanation of symbols]

 10 Home transmission line 12 Network termination device 20,30,40,50,60,70,80 Extension device 201 -20n, 801-80n Terminal device 22,42,52,62,72 Extension communication processor 26 Extension transmission Line 32 mixing circuit (identification means) 34 switch control circuit CN0 to CNn socket PSX, PSi power supply circuit S1, S2 switch T transformer TE1 to TEn terminal TX radio transmission circuit RX radio reception circuit

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Tomoyuki Kurosaki 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (56) References JP-A-4-97649 (JP, A) JP JP-A-4-97647 (JP, A) JP-A-3-54949 (JP, A) JP-A-2-86391 (JP, A) JP-A-2-79698 (JP, A) JP-A-2-196595 (JP) , A) JP-A-64-81596 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04M 11/00-11/10 H04M 1/00 H04M 1/72 H04Q 5/00 -5/24

Claims (4)

(57) [Claims] A home terminal having a plurality of sockets is accommodated in a network terminator having a terminating function on a subscriber side of a communication network, and a terminal connected to the home transmission line via the socket is connected to a terminal. An extension communication system for performing extension communication via the in-home transmission line and for performing extension communication between the same in-home terminals, wherein the extension communication system is connected to the in-home transmission line via a network terminating device. Apart from the subscriber transmission line connected to the communication network Te comprises an extension additional device for extension communication, the inner line addition unit, and the extension transmission line for transmitting a signal for extension communication, the home A terminal addition device that is connected between the socket of the transmission line and each terminal to branch a signal for extension communication to the extension transmission line without sending the signal to the home transmission line; and transmitting the signal via the extension transmission line . Be done It performs the processing of the line signal,
Look including the extension communication processing apparatus for performing call connection control of the extension communication between the home terminal, the terminal additional device, the extension transmission line or home transmission line
Switching means for selectively switching any one of
And extension communication or external communication based on signals transmitted and received from the terminal.
Identification means for identifying the start of line communication, and when extension communication is performed based on the identification result of the identification means
The switching means is connected to the extension transmission line.
The end of the communication and the incoming call from the outside line
Control means for releasing the connection and connecting to the home transmission line.
An extension communication system comprising: 2. A terminal function on a subscriber side of a communication network.
Home transmission line with multiple sockets
Is housed and connected to the home transmission line via the socket.
External terminal performs external line communication via the home transmission line.
In order to perform extension communication between terminals in the same home
An extension communication system comprising:
In addition to the subscriber transmission line connected to the communication network via
An extension device for line communication is provided, and the extension device transmits a signal for extension communication.
Line transmission line, the socket of the home transmission line and each terminal.
Is continued sends a signal of Me other extension communication in the home transmission line
Terminal additional equipment for branching to the extension transmission line without causing
And processing the extension signal transmitted by the extension transmission line,
Extension communication for call connection control of extension communication between home terminals
A transmission processing device, wherein the extension transmission line comprises a transmission line laid in a house, and the transmission line is connected to a vacant terminal of a socket of the house transmission line.
A plurality of connection terminals respectively connected to the connection terminals;
Connected to a vacant terminal of the in-home transmission line at
It is connected to the terminal addition device via a vacant terminal, and the electrical connection between the extension transmission line and the extension communication processing device and
Electrical connection between the extension transmission line and the terminal addition equipment.
Transmission and reception lines
And the transformer coupling enables extension communication between home terminals.
Supplied to the power supply circuit of the extension communication processing device
Power is added to the terminal from the transmission line and the reception line of the extension transmission line
Extension communication system characterized in Rukoto supplied to the respective terminals through the device. 3. A terminal function on a subscriber side of a communication network.
Home transmission line with multiple sockets
Is housed and connected to the home transmission line via the socket.
External terminal performs external line communication via the home transmission line.
In order to perform extension communication between terminals in the same home
An extension communication system comprising:
In addition to the subscriber transmission line connected to the communication network via
An extension device for line communication is provided, and the extension device transmits a signal for extension communication.
Line transmission line, the socket of the home transmission line and each terminal.
Then, a signal for extension communication is transmitted to the home transmission line.
Terminal additional equipment for branching to the extension transmission line without causing
And processing the extension signal transmitted by the extension transmission line,
Extension communication for call connection control of extension communication between home terminals
And the terminal addition device and the extension communication processing device are respectively wireless.
Transmitting means and wireless receiving means;
Extension means on a wireless transmission path between the wireless communication means and the wireless receiving means.
An extension communication system, wherein a transmission line is formed . 4. The extension communication system according to claim 3, wherein a power supply is provided between the extension communication processing device and the terminal addition device.
A power supply line is provided, and each end is connected through the power supply line.
Extension to the wireless transmission means and wireless reception means of the
Communication power from the power supply circuit provided in the communication processing device
Extension communication system characterized by being provided .