JP2868077B2 - ISDN terminal adapter with optical interface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ISDN (Int)
Egrated Service Digital N
network) terminal adapter.

[0002]

2. Description of the Related Art Conventionally, the terminal side interface of this kind of ISDN terminal adapter has been electrically connected using a cable or the like.

Referring to FIG. 4, a conventional ISDN terminal adapter 81 includes an ISDN network control unit 2, a speed matching unit 3, a device control unit 4, and an electrical DTE (Data Te).
rminal Equipment: data terminal device)
It has a control unit 6.

[0004] The electrical DTE controller 6 is connected to an external connection DTE 9 via signal lines 22 and 23. Electrical D
The TE controller 6 and the signal lines 22 and 23 are connected to the external connection DT
An electrical interface electrically connected to E9 by a cable or the like is configured.

[0005] Reference numerals 11 to 14 denote signal lines.
Reference numerals 18 and 20 are buses.

[0006] The ISDN network control unit 2 is connected to the ISDN line 1 and performs outgoing / incoming call control and B channel switching control for the exchange.

[0007] The speed matching unit 3 connects the electrical DTE control unit 6 and the ISDN network control unit 2 and converts low-speed data sent from the externally connected DTE 9 to a B channel speed of 64 Kbit / s of the ISDN network. doing. Also, the B channel speed received from the ISDN network control unit 2 is 64 Kbit /
s data according to the communication speed of the external connection DTE9,
Speed conversion to low speed.

The device control unit 4 controls the ISDN terminal adapter 81, and includes a CPU (Central).
Processing Unit), RAM (Ran
dom Access Memory) and ISDN
It is composed of a ROM (Read Only Memory) in which a control program of the terminal adapter 81 is written.

[0009]

In the conventional ISDN terminal adapter 81, the first problem is that an electric interface connected to a terminal side interface between the electric DTE control unit 6 and the external connection DTE 9 by a signal cable. Because it was used, connection and disconnection is complicated,
The ISDN terminal adapter 81 had to be fixedly installed on the external connection DTE 9.

The second problem is that the external connection DTE 9 has an IS
Since the DN terminal adapter 81 is fixedly connected with the signal cable, only one external connection DTE 9 can use the ISDN terminal adapter 81.

An object of the present invention is to use an optical interface as a terminal connection interface of an ISDN terminal adapter to facilitate connection with a terminal, and to simultaneously use a conventional electric interface connected by a cable to perform external operation. An object of the present invention is to provide an ISDN terminal adapter for switching between two interfaces without using an ISDN terminal adapter.

[0012]

According to the present invention, in addition to an electrical interface, a terminal-side interface is provided.
An optical interface, and detecting means for detecting that a terminal is connected to the optical interface at the time of calling, wherein the detecting means is connected to the optical interface. ISDN provided with an optical interface, wherein the terminal-side interface is switched from the electrical interface to the optical interface when detecting
A terminal adapter is obtained.

[0013]

Further, according to the present invention, the terminal-side interface includes an optical interface in addition to the electrical interface, and detects that the terminal is connected to the optical interface when receiving a call. Wherein the detection unit switches the terminal-side interface from the electrical interface to the optical interface when the detection unit detects that the terminal is connected to the optical interface. An ISDN terminal adapter with a dynamic interface is obtained.

Further, according to the present invention, an optical interface is provided as an interface on the terminal side in addition to the electrical interface, and the terminal is connected to the optical interface at the time of calling and receiving a call. When the detecting means detects that the terminal is connected to the optical interface, the detecting means switches the terminal-side interface from the electrical interface to the optical interface. ISDN with characteristic optical interface
A terminal adapter is obtained.

[0016]

[Function] By providing an optical interface,
When the terminal communicates, the cable connection as an electrical interface and the setting for the ISDN terminal adapter become unnecessary. A terminal device having an optical interface can perform ISDN communication without being aware that the terminal device is connected to an ISDN terminal adapter.

[0017]

Next, an embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 1, an ISDN terminal adapter 8 having an optical interface according to an embodiment of the present invention includes an ISDN network control unit 2, a speed matching unit 3, a device control unit 4, a DTE signal switching unit 5, It has an electrical DTE controller 6 and an optical DTE controller 7.

The electrical DTE controller 6 is connected to an external connection DTE 9 via signal lines 22 and 23. Electrical D
The TE controller 6 and the signal lines 22 and 23 are connected to the external connection DT
An electrical interface electrically connected to E9 by a cable or the like is configured.

The optical DTE controller 7 includes an optical signal path 26
And 27 to the external connection DTE9. The optical DTE control unit 7 and the optical signal paths 26 and 27 constitute an optical interface for optically connecting to the external connection DTE 9.

Note that 11 to 16 are signal lines, and 17 to
21 is a bus.

The ISDN network control unit 2 is connected to the ISDN line 1 and controls calling / incoming / outgoing calls and (data) channel switching control for the exchange.

The speed matching unit 3 includes a DTE signal switching unit 5
It is connected to the SDN network control unit 2 and converts a low-speed data signal sent from the DTE signal switching unit 5 to a data rate of 64 Kbit / s of the ISDN network. Also, the 64 Kbit / s data received from the ISDN network control unit 2 is
The speed is converted to a low speed that matches the TE speed.

The DTE signal switching section 5 is provided between the speed matching section 3 and the electrical DTE control section 6 and between the speed matching section 3 and the optical DTE control section.
The electric DTE control unit 6 is located between the
And the transmission and reception signals of the optical DTE control unit 7 are switched.

The electrical DTE control unit 6 is located between the DTE signal switching unit 5 and an external connection DTE 9 electrically connected thereto, receives transmission data from the external connection DTE 9 and Is sending to. In addition, data received from the DTE signal switching unit 5 is transmitted to the external connection DTE 9.

The optical DTE control section 7 includes a DTE signal switching section 5 and an externally connected DTE 10 optically connected thereto.
And receives optical transmission data from the external connection DTE 10, performs optical / electrical conversion, and transmits the data to the DTE signal switching unit 5. In addition, it converts the data received from the DTE signal switching unit 5 into electrical / optical conversion and transmits the data to the external connection DTE 10.

The device controller 4 controls the ISDN terminal adapter 8 having an optical interface, and has a CPU, a RAM, and a ROM in which a control program for the ISDN terminal adapter 8 having an optical interface is written. And so on.

Next, the operation of the present invention will be described with reference to the calling operation flow of FIG. In the ISDN terminal adapter 8 having the optical interface of the present invention,
The optical DTE control unit 7 detects whether the external connection DTE 10 having an optical interface is connected, that is, whether the external connection DTE 10 is optically coupled. If the light is detected, it is in a state where it can communicate with the external connection DTE 10, establishes a link, and waits for a state in which a call request can be accepted. In this state, when a call request command is received from the externally connected DTE 10 which is optically coupled, the call reception is prohibited for the electrical DTE interface, and the DTE signal switching unit 5 is switched to the optical DTE control unit 7. And the speed matching unit 3 are connected.

The device control unit 4 includes an optical DTE control unit 7
Analyzes the contents of the received call command, causes the ISDN network control unit 2 to perform a call operation, and detects an incoming call response from the other party.
Notify that the state is the N-LINE state. Optical DT
The E control unit 7 notifies the external connection DTE 10 of the ON-LINE, and the external connection DTE 10 can start communication end-to-end.

If the optical DTE controller 7 cannot detect light from the externally connected DTE 10 and cannot establish a communication state or link, the optical interface is determined to be unconnected, and the electrical DTE controller 7 , Waiting for a call request command from the external connection DTE 9 having an electrical interface. In this state, when there is a call request from the external connection DTE 9, first, the optical DTE control unit 7
In response to the command, the DTE signal switching unit 5 is switched so that the electrical DTE control unit 6 and the speed matching unit 3 are connected.

The device control unit 4 includes an electric DTE control unit 6
Analyzes the contents of the received call command, causes the ISDN network control unit 2 to perform a call operation, and detects an incoming call response from the other party.
Notify that the state is the N-LINE state. Electrical DT
The E control unit 6 notifies the external connection DTE 10 of the ON-LINE, and the external connection DTE 10 can start communication end-to-end.

Next, the incoming call operation will be described with reference to the incoming call operation flow of FIG. When there is an incoming call from the ISDN line 1 to the ISDN terminal adapter 8 having the optical interface of the present invention, the incoming message is ISD
It enters the N network control unit 2, where it performs layer 1 synchronization and layer 2 frame processing, analyzes and extracts the incoming message of layer 3, and sends it to the device control unit 4 via the control bus 17. The device control unit 4 analyzes the received message and performs the following operation.

First, the optical DTE controller 7 detects the optically coupled light from the externally connected DTE 10, and determines the communication state and whether a link can be established.
If the communication state can be established, the external connection DTE 10 is notified via the optical DTE control unit 7 that there is an incoming call from the ISDN network. Similarly, electrical DTE
9 notifies the external connection DTE 9 that there is an incoming call from the ISDN network via the control unit 6. Next, the optical D
The TE controller 7 waits for a response from the external connection DTE 10, and if there is a response, the electrical DTE
Via the control unit 6, an indication of an incoming call failure is sent to the external connection DTE 9. Next, the DTE signal switching unit 5 is switched to connect the optical DTE control unit 7 and the speed matching unit 3. After the switching is completed, the ISDN network control unit
An incoming call response is transmitted to the N network 1. Thereby ON-LIN
The E state is established, and the external connection DTE 10 can start communication end-to-end.

When the optical DTE controller 7 cannot establish a communication with the external DTE 10 and cannot establish a link with the external DTE 10, the electrical DTE controller 6 waits for a response from the external DTE 9. If there is a response, the optical DTE controller 7 first transmits an optical interface call failure. However, since it is not in a communicable state, a virtual transmission is performed, and the incoming call processing of the optical DTE control unit 7 is completed. Next, the DTE signal switching unit 5 is switched to connect the electrical DTE control unit 6 and the speed matching unit 3, and the ISDN network control unit 2 sends a response message to the ISDN line 1 for receiving the incoming call. Send.
Thereby, the ON-LINE state is established, and the electric D
The external connection DTE 9 connected to the TE control unit 6 can start communication end-to-end.

If the optical DTE control unit 7 cannot perform optical coupling with the external connection DTE 10 and the electric DTE control unit 6 does not respond from the external connection DTE 9, the ISDN network control unit 2 A response of the rejection of the incoming call is returned to the ISDN line 1.

According to the above-described embodiment of the present invention, in addition to the electrical interface,
An optical interface, the optical interface having means for detecting whether or not a terminal is connected;
When an incoming call is made from the SDN line, means for notifying the incoming call to both interfaces and determining that the call has been answered quickly, means for notifying the terminal of the success / failure of the incoming call, At the time of a call, an ISDN terminal adapter having an optical interface characterized by having a means for judging which interface or a call command has been transmitted earlier and a means for notifying a call success / failure is obtained. .

As described above, by connecting the external connection DTE having the electrical interface and the external connection DTE having the optical interface to the ISDN terminal 8 having the optical interface of the present invention, there is no special switching operation. In addition, communication via the ISDN network can be performed.

[0038]

The first effect of the present invention is that a terminal device having an optical interface in addition to a terminal device having an ordinary electrical interface can be used without any special switching operation.
Communication can be performed using an ISDN network using an SDN terminal adapter.

The second effect of the present invention is that, since the interface with the terminal device is connected by an optical interface, there is no need to change the connection of the terminal device with a cable.
It is easy to move.

Further, since the ISDN terminal adapter can be shared by a plurality of terminal devices, costs can be reduced.

[Brief description of the drawings]

FIG. 1 shows an I with an optical interface according to the invention.
It is a block diagram of an SDN terminal adapter.

FIG. 2 is an ISDN having the optical interface of FIG.
6 is a flowchart for explaining a calling operation of the terminal adapter.

FIG. 3 is an ISDN having the optical interface of FIG. 1;
It is a flowchart for explaining the incoming call operation of the terminal adapter.

FIG. 4 is a block diagram of a conventional ISDN terminal adapter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ISDN line 2 ISDN network control part 3 Speed matching part 4 Device control part 5 DTE signal switching part 6 Electrical DTE control part 7 Optical DTE control part 8 ISDN terminal adapter 22, 23 Signal line 26, 27 Optical signal path 11- 16 signal lines 17-21 bus

Claims (3)

(57) [Claims] An optical interface is provided as an interface on the terminal side in addition to an electrical interface, and a detecting means for detecting that a terminal is connected to the optical interface at the time of calling is provided. When the detecting means detects that the terminal is connected to the optical interface, the terminal interface is switched from the electrical interface to the optical interface. ISDN terminal adapter. 2. A terminal-side interface comprising an optical interface in addition to an electrical interface, comprising a detecting means for detecting that a terminal is connected to the optical interface when receiving a call, When the detecting means detects that the terminal is connected to the optical interface, the terminal interface is switched from the electrical interface to the optical interface. ISDN terminal adapter. 3. An optical interface in addition to an electrical interface as a terminal-side interface, wherein a detecting means for detecting that a terminal is connected to the optical interface at the time of calling and receiving a call is provided. Have
When the detecting means detects that the terminal is connected to the optical interface, the terminal interface is switched from the electrical interface to the optical interface. ISDN terminal adapter.