JPH1117832A - Interface circuit for analog port control of isdn terminal adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain miniaturization and simplification of a system by making it possible to directly connect a subscriber line interface circuit or the like which constitutes an analog port without using a logic circuit external to an interface circuit for the analog port of an ISDN terminal adapter. SOLUTION: An interface circuit A1F for an analog port control composed of a microprocessor central processing unit(CPU) for connecting to an ISDN circuit network, a control register(CR) controlled by this microprocessor CPU and a control logic(CL) in which an operation is controlled by the CR is prepared on a chip of an integrated circuit(IC). The analog port is made to be able to be directly connected to a semiconductor integrated circuit for an ISDN terminal adapter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interface circuit for controlling an analog port of an ISDN terminal adapter. The interface circuit for controlling the analog port of the ISDN terminal adapter according to the present invention can be directly connected to a subscriber line interface circuit or the like constituting an analog port without using an external logic circuit, thereby reducing the size of the system. It has been simplified and simplified.

[0002]

The ISDN integrated digital communication network is capable of communicating different media such as telephone voice, data of a computer or a communication terminal, and image data through a single communication line. It is a very convenient system that can communicate at the same time. In order to connect a conventional V interface or X interface communication device such as a voice telephone or a computer to the ISDN, a terminal adapter for converting the conventional standard into the ISDN standard is used. This terminal adapter is provided with an analog port for connecting an analog telephone or the like.
In order to connect a subscriber line interface circuit or the like constituting an analog port even in an N integrated circuit, it is necessary to provide a complicated analog port control interface circuit constituted by a program logic or the like outside the integrated circuit. Was.

[0003]

2. Description of the Related Art FIG. 2 is a block diagram showing an interface circuit for controlling an analog port of a conventional ISDN terminal adapter. In FIG. 2, IC is ISDN
Integrated circuit (hereinafter abbreviated as LSI) for
It has a microprocessor CPU for controlling connection with the SDN network. The IC of the LSI for ISDN converts signals of different media such as telephone voice, computer and communication terminal data, image data, and the like added thereto into signals corresponding to the ISDN layer 1 protocol and connects to the ISDN circuit network. .

The AIF is an interface of an analog port. Analog port interface AIF
Are the voice coding interface IF1, the subscriber line interface IF2, the dial signal interface I
I have F3. CNT is a control circuit, which is configured by logic and has an interface AIF of an analog port.
Control of signals between the IC and the IC of the ISDN LSI. In the analog port control interface circuit configured as described above, the audio signal of the conventional analog telephone connected to the analog port interface AIF is converted into a digital signal by the audio encoding interface IF1, and the analog signal is transmitted to the control circuit CNT. IS by control
Various signals of the subscriber line interface IF2 and dial signal interface IF3 are added to the ISDN LSI under the control of the control circuit CNT, and are connected to the ISDN circuit network in addition to the DN LSI.

As described above, in the conventional interface circuit for controlling an analog port of an ISDN terminal adapter, a subscriber line interface circuit or the like constituting an analog port cannot be directly connected to an IC of an LSI for ISDN. A control interface circuit for controlling transmission / reception of data to / from an IC of an LSI for ISDN and a control signal is provided by an analog port and an ISD.
It has to be provided between the IC of the LSI for N. This control interface circuit is manufactured by a programmable logic circuit, and it is necessary to individually design it according to the conditions of the terminal connected to the circuit. In addition to the complexity of the system, the number of man-hours for the system and the size of the device have been increased.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a microprocessor for connection to an ISDN network, a control register controlled by the microprocessor, and control logic whose operation is controlled by the control register. By creating an interface circuit for controlling an analog port on one integrated circuit chip, an analog port can be directly connected to a semiconductor integrated circuit for an ISDN terminal adapter, thereby solving the problems of the conventional device. Is measured.

[0007]

FIG. 1 is a block diagram showing an embodiment of an interface circuit for an analog port of an ISDN terminal adapter according to the present invention. In FIG. 1, the IC is an ISDN LSI, which has a microprocessor CPU, a control register CR controlled by the microprocessor CPU, a control logic CL whose operation is controlled by the control register CR, and an interrupt logic IL. .

[0008] Microprocessor C of LSI for ISDN
The PU converts signals of different media such as telephone voice, computer and communication terminal data, image data, etc., added thereto into signals corresponding to the ISDN layer 1 protocol, and connects to the ISDN circuit network. The control of the control register CR is performed to control the exchange of signals between the interface AIF of the analog port and the IC of the LSI for ISDN. AIF is an interface of an analog port.

Interface AIF for analog port
Are the voice coding interface IF1, the subscriber line interface IF2, the dial signal interface I
I have F3. An analog port interface AIF voice encoding interface IF1, subscriber line interface IF2, and dial signal interface IF3 are directly connected to the control logic CL of the ISDN LSI IC, and also include a subscriber line interface IF2, a dial signal interface. IF3
Is also directly connected to the interrupt logic IL.

The operation of the interface circuit for controlling the analog port of the ISDN terminal adapter according to the present invention thus configured will be described below. A voice signal of a conventional analog telephone connected to an interface AIF of an analog port is converted into a digital signal by a voice encoding interface IF1, and is converted to an ISDN signal.
It is added to the microprocessor CPU of the ISDN LSI under the control of the control logic CL of the IC for the LSI. Also, various signals of the subscriber line interface IF2 and the dial signal interface IF3 are applied to the microprocessor CPU of the ISDN LSI under the control of the control logic CL.

Further, the signals of the subscriber line interface IF2 and the dial signal interface IF3 are directly applied to the microprocessor CPU of the ISDN LSI via the interrupt logic IL, and the signals of the subscriber line interface IF2 and the dial signal interface IF3 change. Microprocessor C for LSI for ISDN
The PU can perform interrupt processing for performing necessary processing. To make a call from a telephone connected to the analog port interface AIF,
First, the hook of the telephone is raised. The change of the signal of this hook is performed by the interrupt logic IL from the subscriber line interface IF2 of the interface AIF of the analog port.
Is added to

The interrupt logic IL responds to this by
An interrupt signal is generated for the microprocessor CPU of the LSI for DN and the interface A of the analog port
Inform that the hook of the telephone connected to the IF has been lifted, and start the preparation. Microprocessor C
PU responds to the interrupt signal of the interrupt logic IL,
It issues a command for telephone processing to the control register CR. The control register CR controls the control logic CL so that telephone processing can be performed according to a command from the microprocessor CPU.

Next, when the telephone user dials the telephone number of the other party, the dial signal is applied to the dial signal interface IF3 of the interface AIF of the analog port, and the dial number is registered as a digital code. When the registration of the dial number ends, the dial signal interface IF3 generates a registration end signal to the interrupt logic IL. Interrupt logic I
In response to this, L generates an interrupt signal for reading the dial number to the microprocessor CPU of the ISDN LSI. The microprocessor CPU issues a command for a telephone number reading process to the control register CR in response to the interrupt signal of the interrupt logic IL. The control register CR controls the control logic CL in accordance with a command from the microprocessor CPU and performs a telephone number reading process.

When the telephone number is read, the microprocessor CPU operates the connection to the telephone number of the other party through the ISDN circuit network, and issues a connection completion command to the control register CR when the connection is successful. . The control register CR controls the control logic CL in response thereto, and performs an operation of transmitting a connection signal to the telephone set requesting a call from the subscriber line interface IF2 of the interface AIF of the analog port.
The telephone user starts talking with the other party in response to the connection signal. The voice signal of the telephone call is converted into a digital signal by the voice coding interface IF1, and the control logic C of the ISDN LSI IC is converted.
Under the control of L, it is added to the microprocessor CPU of the ISDN LSI.

[0015] Thus, conventional telephones are ISD
Make a call using the N network. Further, when a call is received from a destination telephone set of the ISDN circuit network to a conventional telephone set connected to the interface AIF of the analog port, the microprocessor CPU of the ISDN LSI controls the control logic CL. Control the
A calling signal is generated from the subscriber line interface IF2 to notify that a call has been received and control is performed so that a call can be made.

When a call is started, the control logic CL controls the IS under the control of the microprocessor CPU.
The digital voice signal of the DN network is converted into an analog signal via a voice coding interface IF1 and supplied to a conventional telephone. The analog voice signal of the conventional telephone is converted into a digital voice signal in the voice coding interface IF1 under the control of the control logic CL and sent out to the ISDN network for telephone communication.

As described above, the protocol of the signal of the analog port to which a communication device such as a conventional telephone is connected is
The control logic CL performs control for converting the signal into a protocol of the SDN network and converting the analog signal into a digital signal to communicate with the ISDN network. In this case, the setting of various operations of the control logic CL is performed by a control register CR controlled by the microprocessor CPU and a control register CR.
It is done by doing. That is, the control register CR is controlled by the program of the microprocessor CPU.
Can be set, and various control states can be set or changed without using special hardware. In particular, even when the number of analog ports is increased by two or more, an arbitrary analog port can be easily set by changing the program only by increasing the number of control registers CR and control logic CL.

[0018]

As is apparent from the above description, the interface circuit for controlling the analog port of the ISDN terminal adapter according to the present invention comprises a microprocessor for connecting to an ISDN network and a control circuit controlled by the microprocessor. By forming an interface circuit for analog port control composed of a register and control logic whose operation is controlled by a control register on one chip,
An analog port can be directly connected to a semiconductor integrated circuit for an SDN terminal adapter.

For this reason, the following various effects can be obtained. 1. The cost of the system using the interface circuit for controlling the analog port of the ISDN terminal adapter of the present invention can be reduced. 2. The simplicity of the ISDN terminal adapter system increases versatility. 3. Since an external control circuit is not required, the size of a device using an interface circuit for controlling an analog port of an ISDN terminal adapter is reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an interface circuit of an analog port of an ISDN terminal adapter according to the present invention.

FIG. 2 is a block diagram showing an interface circuit of an analog port of a conventional ISDN terminal adapter.

[Explanation of symbols]

IC: LSI for ISDN, CPU: Microprocessor, CR: Control register,
CL: control logic, IL: interrupt logic, AIF: analog port interface, IF1: voice coding interface, IF2: subscriber line interface, IF3: dial signal interface

Claims (4)

[Claims] An analog port constituted by a microprocessor for controlling connection with a layer 1 of an ISDN network, a control register controlled by the microprocessor, and control logic whose operation is controlled by a control register CR. ISDN formed on a one-chip semiconductor integrated circuit and a subscriber line interface or the like constituting an analog port can be directly connected to the semiconductor integrated circuit.
Interface circuit for controlling the analog port of the terminal adapter. 2. A microprocessor for controlling connection to a layer 1 of an ISDN circuit network, a control register controlled by the microprocessor, and control logic and interrupt logic whose operation is controlled by a control register CR. The interface circuit of the analog port is formed on a one-chip semiconductor integrated circuit, and the subscriber line interface or the like constituting the analog port can be directly connected to the semiconductor integrated circuit for controlling the analog port of an ISDN terminal adapter. Interface circuit. 3. A microprocessor for controlling connection to a layer 1 of an ISDN network, a control register controlled by the microprocessor, and control logic and interrupt logic whose operations are controlled by a control register CR. ISDN in which the interface circuit of the analog port is formed on a one-chip semiconductor integrated circuit, and a voice coding interface, a subscriber line interface, and a dial signal interface constituting the analog port can be directly connected to the semiconductor integrated circuit. Interface circuit for controlling the analog port of the terminal adapter. 4. A microprocessor for controlling connection to a layer 1 of an ISDN network, a control register controlled by the microprocessor, and control logic and interrupt logic whose operation is controlled by a control register CR. The interface circuit of the analog port is formed on a one-chip semiconductor integrated circuit, and a voice coding interface, a subscriber line interface, and a dial signal interface, which constitute the analog port, are connected to the semiconductor integrated circuit through the control logic. An ISDN terminal adapter connected to a processor for applying interrupt signals of a subscriber line interface and a dial signal interface to the microprocessor via the interrupt logic. Interface circuit for Narogupoto control.