JPH06133079A - Terminal adapter for isdn communication equipment - Google Patents

Abstract

PURPOSE:To attain communication with another network by connecting a communication equipment dedicated to ISDN to another communication equipment by way of a terminal adapter. CONSTITUTION:When an ISDN telephone set 2 or FAX 3 is started, an ISDN interface part 1e executes a corresponding call connection procedure to form the communication link of a channel B between with the started equipment. At the same time, a control part 1i reads a set dial number, controls a PSTN interface part 1a and calls an opposite telephone set 7 or FAX 8. When the opposite party resonds to the call, an interface part 1a receives a data signal by way of the formed communication link and converts it into a digital signal by CODEC 1 to send it to the telephone set 2 or FAX 3. At the same time, the interface part 1a receives a data signal from the equipments and converts it into an analog signal by CODEC 1c to transmit it to the opposite party. Thus, an operator can speak and transmit/receive an original picture with another network.

Description

Detailed Description of the Invention

[0001]

The present invention relates to ISDN (Integral)
rated Services Digital Ne
The present invention relates to a communication device terminal adapter for using a dedicated communication device in another network.

[0002]

2. Description of the Related Art In recent years, the countries and regions where ISDN can be used have expanded, and the number of ISDN users has increased. Along with this, various ISDN-dedicated communication devices have been developed, while various communication devices also serving as other networks and various terminal adapters for connecting communication devices of other networks to ISDN have been developed. For example, ISDN and PSTN (Public) are available as communication devices that are also used for other networks.
Switches Telephone Network
Facsimile machines that can be used with either rk) are widely used. Also, as a terminal adapter,
It is well known that a PSTN telephone is connected to an ISDN.

[0003]

By the way, a communication device of another network uses the terminal adapter as described above,
Although it is possible to communicate by connecting to SDN, conventionally, there is a disadvantage that a communication device dedicated to ISDN cannot be connected to another network to communicate.

The present invention solves the above problems and provides ISDN
It is an object of the present invention to provide a terminal adapter for an ISDN communication device, which can connect a dedicated communication device to another network for communication.

[0005]

A terminal adapter for an ISDN communication device according to the present invention connects an ISDN-dedicated communication device to another network, and connects the other network to the other communication device by means of a call originating / receiving operation of the connected network. The communication signal of the ISDN-dedicated communication device is transmitted to the other communication device via the communication link, and the reception signal from the other communication device is output to the ISDN-dedicated communication device. ing.

[0006]

As a result, the ISDN-dedicated communication device can be connected to another network to communicate with another communication device.

[0007]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a communication system according to an embodiment of the present invention. In the figure, a telephone 2, a facsimile apparatus 3 in G3 mode and a facsimile apparatus 4 in G4 mode are connected to a terminal adapter 1. All these three devices are I
It is for SDN only. As a communication line, PS
TN5 line and DDX (Digital Data)
eXchannel) network 6 is connected. In this embodiment, as the communication partner device, the PSTN 5 is connected to the telephone 7 and the G3 mode facsimile device 8, and the DDX network 6 is connected to the G4 mode facsimile device 9.
Are connected.

In the terminal adapter 1, the PST
The N interface unit 1a executes line control and signal transmission / reception with respect to the PSTN 5. Modem 1b
Is for transmitting and receiving a procedure signal for transmission control during G3 mode facsimile communication, and for modulating and demodulating image information for transmission. The CODEC 1c is for converting an audio signal into a digital signal during a call and vice versa.

The DDX interface unit 1d executes line control and signal transmission / reception with respect to the DDX network 6,
CCITT Recommendation V. 24. V. 28 or V.I. 35
Complies with.

The ISDN interface unit 1e executes transmission / reception of signals to / from the telephone set 2, the facsimile apparatus 3 and the facsimile apparatus 4. Image memory 1
f is for temporarily storing image information. Speed converter 1
g is for converting the transfer rate of the transmission data, and CCI
TT Recommendation V. Compliant with 110, 64 kbps, 48
Mutual conversion with kbps or 56 kbps is performed. The image information conversion unit 1h converts the encoding method and resolution of image information to be transmitted. The control unit 1i is a microcomputer that controls the above units.

With the above configuration, in the communication system of this embodiment, the telephones 2 and 7, the facsimile machines 3 and 8, and the facsimile machines 4 and 9 communicate with each other.
Facsimile devices 3 and 9 and facsimile devices 4 and 8
I also try to communicate with.

FIG. 2 is an explanatory diagram when the telephones 2 and 7 or the facsimile machines 3 and 8 communicate with each other.

Now, for example, it is assumed that the telephone 2 or the facsimile machine 3 is activated by a predetermined calling operation by the operator. In this case, the dialed number of the telephone 7 or the facsimile machine 8 is set in the activated telephone 2 or facsimile machine 3. The activated device is I
Initiate a predetermined call connection procedure for the SDN D channel. I
The SDN interface unit 1e executes a corresponding call connection procedure to form a B-channel communication link with the activated device.

When executing the call connection procedure, the control unit 1i reads the set dial number and
The N interface unit 1a is controlled. As a result, PS
The TN interface unit 1a calls the other party via the PSTN 5.

When the destination device, that is, the telephone 7 or the facsimile device 8 responds, the PSTN interface unit 1a receives the analog data signal transmitted from the destination device via the formed communication link. CO
The DEC 1c converts the data signal into a digital signal. The ISDN interface unit 1e sends the digital signal to the telephone 2 or the facsimile device 3 and receives the data signal sent from these devices. The CODEC 1c converts the data signal into an analog signal. The PSTN interface unit 1a transmits the analog signal to the telephone 7 or the facsimile machine 8.

In this way, the telephones 2 and 7 or the facsimile machines 3 and 8 perform predetermined communication. As a result, the operator talks and sends and receives original images.

Next, for example, if the telephone 7 or the facsimile machine 8 is activated by the operator, P
The PSTN interface unit 1a receives the call via the STN 5. In response to this, the PSTN interface unit 1a forms a communication link with those devices. At this time, the ISDN interface unit 1e first calls the facsimile device 3 and executes a predetermined call connection procedure. The facsimile device 3 executes a corresponding predetermined procedure to form a B channel communication link with the ISDN interface unit 1e. Thereafter, in the same manner as above, the data signal sent from the facsimile apparatus 3 is transmitted to the telephone 7
Alternatively, the telephone 7 is transmitted to the facsimile device 8 side while being transmitted.
Alternatively, the signal received from the facsimile machine 8 is sent to the facsimile machine 3.

Now, assuming that a call is received from the facsimile apparatus 8, the operation of the terminal adapter 1 causes
Facsimile device 8 and facsimile device 3 transmit and receive facsimile signals to each other to perform predetermined facsimile device communication.

On the other hand, when an incoming call is received from the telephone 7, the facsimile device 3 does not return a predetermined response signal, and therefore suspends communication. In this way, when the facsimile communication does not proceed, the ISDN interface unit 1e
Disconnects the call to the facsimile apparatus 3. And
A predetermined call connection procedure for calling the telephone 2 is executed. The telephone set 2 executes a corresponding predetermined procedure to form a B-channel communication link with the ISDN interface section 1e. After that, signals are transmitted between the telephones 2 and 7 as described above. This allows the telephones 2 and 7 to communicate.

FIG. 3 is an explanatory diagram when the facsimile devices 4 and 9 communicate with each other.

Now, for example, it is assumed that the facsimile apparatus 4 is activated by a call operation of an operator. This allows
Facsimile device 4 and ISDN interface unit 1e execute a predetermined call connection procedure as described above. The control unit 1i reads the set dial number and executes the DDX interface unit 1d when executing the call connection procedure.
To control. As a result, the DDX interface unit 1d
Makes a call to the facsimile apparatus 9 via the DDX network 6. When the facsimile device 9 responds, the DDX interface unit 1d forms a communication link by a predetermined transmission control procedure and receives the data signal transmitted from the other party.

By the way, in this case, the facsimile machine 9
The transmission speed of the data signal received from the device is 48 kbps or 56 kbps, which is different from the data transmission speed of 64 kbps of various communication devices of ISDN. The speed conversion unit 1g converts the data signal received from the facsimile device 9 into a data transmission speed of 64 kbps. ISDN
The interface unit 1e sends the speed-converted data signal to the facsimile device 4 and receives the data signal sent from the facsimile device 4. The speed conversion unit 1g converts the data signal into a data transmission speed on the facsimile device 9 side. DDX interface unit 1d
Transmits the converted data signal to the facsimile device 9.

Next, assuming that the facsimile machine 9 is activated by the operator's calling operation, the facsimile machine 9 receives a call via the DDX network 6. In response to this, the DDX interface unit 1d forms a communication link with the facsimile device 9.
At this time, the ISDN interface unit 1e calls the facsimile device 4 and executes a predetermined call connection procedure to form a communication link with the facsimile device 4.
Thereafter, similarly to the above, the data signal transmitted from the facsimile device 4 is transmitted to the facsimile device 9 side, while the data signal received from the facsimile device 9 is transmitted to the facsimile device 4.

In this way, the facsimile apparatus 4 and the facsimile apparatus 9 come to execute predetermined facsimile communication.

By the way, although the facsimile devices 3 and 4 are connected to the terminal adapter 1, one of them may not be usable due to a failure or the like. In the present embodiment, in such a case, communication is performed between the facsimile devices 3 and 9 or between the facsimile devices 4 and 8.

FIG. 4 is an explanatory diagram when the facsimile machines 3 and 9 communicate with each other.

For example, assume that the facsimile machine 3 is started by an operator. In this case, ISDN
The interface unit 1e executes a call connection procedure. CO
The DEC 1c converts the data signal sent from the facsimile device 3 into a voice band signal and inputs it to the modem 1b, while sending the voice band signal output from the modem 1b to the facsimile device 3 side. The modem 1b executes a predetermined transmission control procedure of G3 facsimile and receives image information from the facsimile apparatus 3.

By the way, the resolution of the image of the G3 facsimile complies with the millimeter system standard such as 8 × 8 dots / mm. The image information encoding method is an MH (Modified Huffman) method or an MR (Modified Relative) method.
e Element Address Design
te) system basically. On the other hand, G
The resolution of the transmission image of 4 facsimiles is, for example, 200d.
It conforms to the inch standard such as pi (dot / inch). The image information encoding method is MMR.
It is based on the (Modified MR) method.

The image information conversion unit 1h is used by the facsimile device 3
The encoded image information received from is converted into image information conforming to the G4 facsimile standard. Then, the converted image information is temporarily stored in the image memory 1f.

After this, the DDX interface unit 1d
The facsimile device 9 is called by a predetermined procedure, and the image information stored in the image memory 1f is transmitted.

On the other hand, when an incoming call is received from the facsimile apparatus 9, the DDX interface unit 1d responds and receives the image information transmitted in a predetermined procedure. Then, the received image information is temporarily stored in the image memory 1f.

After this, the ISDN interface section 1e
Calls the facsimile device 3. Facsimile device 3
Responds, the predetermined transmission control procedure is executed with the facsimile device 3. Then, the image information of the image memory 1f is read out and converted by the image information conversion unit 1h into image information suitable for the G3 facsimile apparatus. The converted image information is modulated by the modem 1b, converted into a predetermined digital signal by the CODEC 1c, and sent to the facsimile apparatus 3.

FIG. 5 is an explanatory diagram when the facsimile devices 4 and 8 communicate with each other.

For example, assume that the facsimile apparatus 4 is activated. In this case, ISDN interface unit 1
e executes a predetermined call connection procedure, and receives image information sent from the facsimile apparatus 4. Then, the received image information is converted into image information compatible with G3 facsimile by the image information conversion unit 1h and stored in the image memory 1f.
Then, the PSTN interface unit 1a calls the facsimile device 8. Then, the image information in the image memory 1f is read out, modulated by the modem 1b, and transmitted from the PSTN interface unit 1a to the facsimile apparatus 8.

On the other hand, when an incoming call is received from the facsimile apparatus 8, the PSTN interface unit 1a responds and the modem 1b receives the image information in a predetermined procedure. Then, the received image information is temporarily stored in the image memory 1f. After that, the ISDN interface unit 1e calls the facsimile apparatus 4 to establish a call connection. Then, the image information in the image memory 1f is read out, converted by the image information conversion unit 1h into image information compatible with the G4 facsimile, and sent to the facsimile apparatus 4.

Thus, the facsimile communication between the G3 facsimile apparatus and the G4 facsimile apparatus is executed.

As described above, the terminal adapter 1 of the present embodiment connects the telephone 2, the facsimile apparatus 3 and the facsimile apparatus 4 such as ISDN communication apparatuses, while connecting the PSTN 5 and the other network such as the DDX network 6. ing. Then, a communication link with the telephone set 7, the facsimile machine 8 or the facsimile machine 9 is formed by a predetermined call originating / receiving operation of the PSTN 5 and the DDX network 6. Then, through the formed communication link, signal transmission is performed between the telephones 2 and 7, and signal transmission is performed between the facsimile devices 3, 4 and 8, 9.

As a result, the telephone 2 dedicated to ISDN P
It becomes possible to communicate with the telephone 7 of the STN 5 and the facsimile machines 3 and 4 dedicated to ISDN to communicate with the facsimile machine 8 of the PSTN 5 and the facsimile machine 9 of the DDX network 6.

In the above embodiment, the telephone and the facsimile machine are provided as the ISDN-dedicated communication device, but the present invention is naturally applicable to other communication devices as well.

[0041]

As described above, the terminal adapter for an ISDN communication device of the present invention connects the communication device dedicated to ISDN and another network, and connects and disconnects the other network with the other communication device. Since a communication link between them is formed and signals are transmitted between the communication device dedicated to ISDN and another communication device via the communication link, the communication device dedicated to ISDN is connected to another network to Communication device.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a communication system according to an embodiment of the present invention.

[Fig. 2] ISDN dedicated telephone and PSTN telephone or ISDN dedicated G3 facsimile machine and PSTN G
3 is an explanatory diagram when communicating with three facsimile machines. FIG.

[Fig. 3] ISDN dedicated G4 facsimile machine and DDX
It is an explanatory view when communicating with a G4 facsimile apparatus of the network.

[Fig. 4] ISDN dedicated G3 facsimile machine and DDX
It is an explanatory view when communicating with a G4 facsimile apparatus of the network.

FIG. 5: G4 facsimile machine for ISDN and PST
FIG. 7 is an explanatory diagram when communicating with an N G3 facsimile apparatus.

[Explanation of symbols]

 1 Terminal Adapter 1a PSTN Interface 1b Modem 1c CODEC 1d DDX Interface 1e ISDN Interface 1f Image Memory 1g Speed Converter 1h Image Information Converter 1i Controller 2,7 Telephone 3,4,8,9 Facsimile Device 5 PSTN 6 DDX network

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 1/00 104 Z 7046-5C

Claims (1)

[Claims] 1. A means for connecting a communication device dedicated to ISDN, a means for connecting a network other than ISDN, and a means for forming a communication link with another communication device by an originating / receiving operation of the connected network. Means for transmitting a transmission signal of the ISDN-dedicated communication device to the other communication device via the communication link and outputting a reception signal from the other communication device to the ISDN-dedicated communication device. A terminal adapter for ISDN communication equipment.