JPH11164050A - Terminal adapter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal adapter device which can be made inexpensive, compact and light in weight while enabling communication without providing any battery even when a power failure has occurred. SOLUTION: Between an emulate block 12 and a CODEC circuit 13, a hand set connecting terminal 40 is provided for connecting a hand set 55. Power is supplied from a power source circuit 45 to the emulate block 12. The CODEC circuit 13, signal control circuit 33, user side interface circuit 34 and operation control circuit 35 can be operated by power supplied from an exchange through a digital line 90. Even when power can not be supplied from the power source circuit 45 to the emulate block 12 or the like by stopping the supply of commercial frequency power, only by connecting the hand set to the hand set connecting terminal 40, speech can be performed by a battery or the like without operating the emulate block 12 and the terminal adapter device can be made inexpensive, compact and light in weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a terminal adapter device. Specifically, the signal conversion means and the operation control means for controlling the operation of the signal conversion means and the like can be operated by the power supplied from the digital line, and the analog signal from the transmitter connected to the connection terminal can be transmitted. Communication using an analog line without power supply from the power supply means to the switch emulation means by supplying the analog signal output from the signal conversion means to the handset connected to the connection terminal while supplying the analog signal output from the signal conversion means. Even if the device cannot be used, a call can be made without providing a battery in the terminal adapter device.

[0002]

2. Description of the Related Art In recent years, various information has been provided and information has been exchanged using the Internet, which is a world-wide communication network. In order to use the Internet, not only analog lines but also digital lines, For example, digital public lines such as ISDN (Integrated Services Digital Network) are also used. here,
When a digital line is used, a line termination unit (DSU: Digital Service Unit) that is connected to the digital line and performs processing such as speed conversion necessary for digital communication is used, and the line termination unit and data such as a computer device are used. 2. Description of the Related Art A terminal adapter (TA) that performs signal conversion with a terminal device and signal conversion between a line termination device and an analog telephone or the like is used.

[0003]

By the way, power having an upper limit of 400 mW is supplied from the exchange, and this power can be supplied not only to the line termination device but also to the terminal adapter device.

However, the terminal adapter device can be connected to a plurality of data terminal devices and a plurality of analog telephones and facsimile devices which are communication devices using analog lines. A commercial frequency power supply is used because it cannot supply all the power required by the adapter device.

For this reason, if the supply of the commercial frequency power is stopped due to a power failure or the like, the terminal adapter device cannot be operated, and the telephone cannot be used. Also, a terminal adapter device provided with a battery is known so that an analog telephone can be used even when the supply of commercial frequency power is stopped. However, since the battery is used, the terminal adapter device cannot be configured at a low cost, and the terminal adapter device becomes large and heavy.

In view of the above, the present invention provides a terminal adapter device which can perform communication without providing a battery even if a power failure occurs, and which is inexpensive and can be reduced in size and weight.

[0007]

A terminal adapter device according to the present invention converts an analog signal from a communication device using an analog line into a digital signal, outputs the digital signal to a digital line, and outputs a digital signal supplied from the digital line. Signal conversion means for converting a communication signal into an analog signal, a switch emulation means for supplying and monitoring a communication current to a communication device, transmitting a tone dial signal and a call signal, and supplying power using a commercial frequency power supply. A terminal adapter device comprising: a power supply unit for performing a power conversion, and an operation control unit for controlling operations of a signal conversion unit and an exchange emulation unit, wherein a connection terminal for connecting a transmitter and a receiver is provided, and the connection terminal is connected to the connection terminal. The supplied analog signal from the transmitter is supplied to the signal conversion means, and the analog signal output from the signal conversion means The power supply shall be supplied to the handset connected to the connection terminal, the switch emulation means shall be supplied with power from the power supply means, and the signal conversion means and the operation control means shall be operable by the power supplied from the digital line. It is.

In the present invention, the signal conversion means and the operation control means for controlling the operation of the signal conversion means and the like can be operated by the electric power supplied from the digital line. Even when power is not supplied from the power supply means to the means,
For example, by connecting a handset consisting of a transmitter and a receiver to the connection terminal, an analog voice signal from the transmitter of the handset can be converted by a signal conversion means and output to a digital line, and from the digital line Is converted into an analog voice signal by the signal conversion means and supplied to the handset of the handset, so that a telephone call can be made using the handset.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a connection state of a terminal adapter device. This terminal adapter device 10 is, for example, a modular jack for an analog line or an RS-232 which is a digital communication port.
It has a C port. An analog telephone 50, a facsimile device 60, or the like, which is a communication device using an analog line, is connected to the modular jack, and a data terminal device 70 is connected to the RS-232C port. The terminal adapter device 10 is connected to a digital line 90 via a line termination device 80.

When a telephone is used, a voice signal from the analog telephone 50 is converted into a digital signal by the terminal adapter device 10 and the digital signal is transmitted through the line termination device 80 to the IS.
It is output to the digital line 90 of the DN. On the other side, the digital signal supplied via the digital line 90 is transmitted to the terminal adapter device 10 via the line terminating device 80.
And converted to an audio signal to convert the analog telephone 50
Supplied to

Data terminal device 70 such as a computer device
Is connected to a communication network to exchange information or the like, the data signal from the data terminal device 70 is format-converted by the terminal adapter device 10 and
0 to the digital line 90. here,
In a dial-up connection in which a connection to a communication network is made only when necessary using a digital line, a digital signal output to the digital line 90 is output to the communication network via a provider that provides a connection service with the communication network. The data is supplied to another data terminal device connected to the communication network. When information is obtained from another data terminal device, a digital signal indicating the information is supplied to the terminal adapter device via a communication network, a provider, a digital line, and a line termination device, and is converted into a data signal of a predetermined format. Supplied to the data terminal device.

Next, the configuration of the terminal adapter device 10 is shown in FIG.
Shown in Here, it is assumed that the terminal adapter device 10 has two modular jacks 11 and 21 for analog lines and an RS-232C port 31 which is a digital communication port.

The modular jack 11 is connected to an emulation block 12 which is a switch emulation means. Reverse circuit 121 in emulation block 12
Then, when a calling signal (16 Hz) generated by a calling signal sending circuit 122 described later is supplied to the analog telephone 50 connected to the modular jack 11,
When it is detected by the telephone interface circuit 123 to be described later that the analog telephone 50 is set to the off-hook state and the current flows, a process of reversing the direction of the current supplied from the telephone interface circuit 123 to the analog telephone 50 is performed. . The reversal of the direction of the current is used as a signal to start charging the traffic.

The oscillating circuit 30 is
Is connected, a dial tone signal (400 Hz) or a calling signal is generated using the oscillation signal CK from the oscillation circuit 30, and is supplied to the analog telephone 50 via the reverse circuit 121. The supply of the dial tone signal and the calling signal to the analog telephone 50 is controlled based on a control signal RC from the telephone interface circuit 123.

The telephone interface circuit 123 supplies a DC voltage (−48 V) to the analog telephone 50. The analog telephone 50 is set to an off-hook state to detect whether or not a current flows. When the current flows, a call signal transmitting circuit 122 generates a dial tone signal and supplies a control signal to supply the dial tone signal to the telephone. RC
Is generated. When the analog telephone 50 is set to the off-hook state and it is detected that a current has flowed while the call signal is generated and supplied to the analog telephone 50 by the call signal transmission circuit 122, the call signal transmission circuit 122 Control signal R to stop generating the paging signal at 122
C is generated. Also, the telephone interface circuit 12
In the case of No. 3, since the digital communication path is four lines, the two-line to four-line conversion process is performed to convert the two-line audio signal supplied from the analog telephone 50 to four lines, and the four-line audio signal is converted. Is supplied to a D / A / A / D conversion circuit (hereinafter referred to as a “CODEC circuit”) 13 constituting a signal conversion means. The signal conversion means includes the CODEC circuit 13, a signal control circuit 33 described later, and a user network interface circuit 34.

The telephone interface circuit 123 and C
A handset connection terminal 4 for connecting a handset 55 having a transmitter and a receiver between the ODEC circuits 13
0 is provided.

In the CODEC circuit 13, the analog voice signal supplied from the telephone interface circuit 123 is converted into a digital data signal, and is converted into a digital data signal.
And the CODEC from the signal control circuit 33.
The digital data signal supplied to the circuit 13 is converted into an analog voice signal and the telephone interface circuit 1
23.

A PB signal receiving circuit 124 is connected to the telephone interface circuit 123. When the analog telephone 50 is a push button type, a PB signal obtained by operating a dial button of the analog telephone 50 is obtained.
The number of the dial button operated based on the signal (push button dial signal) is determined, and a signal NB indicating the determined number is supplied to an operation control circuit 35 described later.

The emulation block 22 connected to the modular jack 21 is also the emulation block 1
2, the reverse circuit 221 and the call signal transmitting circuit 2
22, a telephone interface circuit 223, a PB signal receiving circuit 224, and an oscillation circuit 30. The CODEC circuit 2 connected to the emulation block 22
3 is the same as the CODEC circuit 13, and the description is omitted.

RS-23 which is a digital communication port
The 2C port 31 is connected to a DTE interface circuit 32. The DTE interface circuit 32 performs signal level conversion, and converts a signal supplied via the RS-232C port 31 into a signal of a predetermined level. The signal is supplied to the signal control circuit 33.

In the signal control circuit 33, two CODECs
When one of the circuits 13 and 23 is selected, the data signal from the selected circuit is supplied to the user network interface circuit 34 as an information signal, and the information signal supplied from the user network interface circuit 34 is COD
It is supplied to either the EC circuit 13 or the CODEC circuit 23. Further, when communication is performed between the data terminal device 70 and the DTE interface circuit 32 via the RS-232C port 31 in an asynchronous mode without using a clock, the asynchronous communication is performed so that this signal becomes a signal synchronized with the clock. -A synchronous conversion process is performed. Further, when the protocol conversion processing of this signal or the communication speed does not correspond to the communication speed via the network, the speed conversion process is performed and the signal is supplied to the user network interface circuit 34 as an information signal. The information signal supplied from the user network interface circuit 34 is subjected to a reverse process,
The data is supplied to the data terminal device 70 via the S-232C port 31.

An operation control circuit 35 as operation control means is connected to the user network interface circuit 34.
A circuit switching signal is generated based on a control signal SC from the operation control circuit 35. Here, when the digital line 90 is an ISDN line of “2B + D” (two information channels and one signal channel), for example, CODEC
An information signal obtained by processing an information signal from the circuit 13 or the CODEC circuit 23 or a signal from the data terminal device 70 is converted into a B-channel signal, and a circuit switching signal is converted into a D-channel signal and output. Is done. Also ISD
When a signal of the B channel or the D channel is supplied from the N line, the signal of the B channel is supplied to the signal control circuit 33, and information is extracted from the signal of the D channel. It is supplied to the control circuit 35.

The operation control circuit 35 is constituted by using a microcomputer, a memory or the like, and controls the control signal SC based on the signals NB from the PB signal receiving circuits 124 and 224.
Is generated by the interface control unit of the user network interface circuit 34 based on the control signal SC, and a connection process with a desired receiving telephone is performed. The user network interface circuit 34
Control signal MC is generated based on the signal DT from
Emulation blocks 12, 22 and CODEC circuit 1
3, 23, the operation of the DTE interface circuit 32, the signal control circuit 33, and the like are controlled. Further, the operation control circuit 3
An operation unit 36 is connected to 5 so that a connection process with a desired receiving telephone can be performed by operating the operation unit 36.

AC power is supplied to a power supply circuit 45 serving as a power supply means.
A plug 46 is connected, and the commercial frequency power supply supplied via the AC plug 46 is set to a predetermined voltage, and the emulated blocks 12, 22 and the CODEC circuit 23, DTE
It is supplied to the interface circuit 32 and the like.

Next, the operation of the terminal adapter device 10 will be described. In the terminal adapter device 10, the emulation blocks 12 and 22 and the CODEC
The power is supplied to the circuit 23, the DTE interface circuit 32, etc., and the CODEC circuit 13, the signal control circuit 3
3. Power is supplied to the user network interface circuit 34 and the operation control circuit 35 from the exchange via the digital line 90.

The CODEC circuit 13 and the signal control circuit 3
3. Since the user network interface circuit 34 and the operation control circuit 35 do not generate a call signal or the like as in the call signal sending circuit 122 and do not supply DC power as in the telephone interface circuit 123, the power consumption is small, and It can be driven by the supplied power.

Here, when the supply of the commercial frequency power is stopped due to a power failure or the like, the emulation block 12,
Since no power is supplied from the power supply circuit 45 to the analog telephone 22, the analog telephone 50 cannot be used. But,
The CODEC circuit 13, the signal control circuit 33, the user network interface circuit 34, and the operation control circuit 35 can be operated by the power supplied from the exchange, so that the handset 55 is connected to the handset connection terminal 40, and the operation unit is operated. The codec circuit 13 converts the analog voice signal from the transmitter of the handset 55 into a digital signal by operating the receiver 36 and dialing the desired receiver telephone number. The data can be output to the digital line 90 via the user network interface circuit 34 and the line terminating device 80. When a digital signal is supplied from the digital line 90, the digital signal is supplied to the line terminating device 80, the user network interface circuit 34,
The signal is supplied to the CODEC circuit 13 via the signal control circuit 33 to be converted into an analog audio signal, and this audio signal is supplied to the receiver of the handset 55 and output as audio. For this reason, even if the supply of the commercial frequency power is stopped, a telephone call can be made using the handset 55.

Thus, according to the above-described embodiment,
Terminal adapter device 1 even if supply of commercial frequency power is stopped
0 is supplied with power from a digital line to the predetermined circuit. Therefore, by connecting a handset to the handset connection terminal 40, a call can be made without providing a battery in the terminal adapter device 10, and the terminal adapter device can be connected. It is inexpensive and can be reduced in size and weight.

Although the CODEC circuit 13, the signal control circuit 33, the user network interface circuit 34 and the operation control circuit 35 are supplied with power from the exchange via the digital line 90, the CODEC circuit 13 and the signal control circuit Circuit 33, user network interface circuit 34
And the operation control circuit 35 also supplies power from the power supply circuit 45, and when the supply of the commercial frequency power supply is stopped, the power supplied from the exchange is supplied to the CODEC circuit 13, the signal control circuit 33, the user network interface circuit 34, and It may be supplied to the operation control circuit 35. Further, the devices and the number of devices connected to the terminal adapter device are examples, and are not limited to the above-described embodiment.

[0030]

According to the present invention, the signal conversion means and the operation control means for controlling the operation of the signal conversion means and the like can be operated by the power supplied from the digital line. By connecting a handset consisting of a handset and a receiver to this signal conversion means, a call can be made even when power is not supplied from the power supply means. Therefore, when the supply of the commercial frequency power is stopped, the analog telephone or the like can be operated. It can be configured and reduced in size and weight.

[Brief description of the drawings]

FIG. 1 is a diagram showing a connection state of a terminal adapter device according to the present invention.

FIG. 2 is a diagram showing a configuration of a terminal adapter device according to the present invention.

[Explanation of symbols]

Reference Signs List 10 terminal adapter device 12, 22 emulation block 13, 23 D / A / A / D conversion circuit (CODEC circuit) 30 oscillation circuit 32 DTE interface circuit 33 signal control circuit 34 user network interface circuit 35 operation control circuit 36 operation unit 40 Handset connection terminal 45 Power supply circuit 50 Analog telephone 55 Handset 60 Facsimile device 70 Data terminal device 80 Line termination device 90 Digital line 121, 221 Reverse circuit 122, 222 Call signal transmission circuit 123, 223 Telephone interface circuit 124, 224 PB signal receiving circuit

Claims (1)

[Claims] 1. A signal conversion means for converting an analog signal from a communication device using an analog line into a digital signal and outputting the digital signal to a digital line, and converting the digital signal supplied from the digital line into an analog signal. An exchange emulator for supplying and monitoring communication current, transmitting a tone dial signal and a call signal, and the like to a communication device; a power supply for supplying power using a commercial frequency power supply; And an operation control means for controlling the operation of the switching unit emulation means, wherein a connection terminal for connecting a transmitter and a receiver is provided, and an analog signal from the transmitter connected to the connection terminal is provided. The analog signal output from the signal conversion means is supplied to the signal conversion means and connected to the connection terminal. The switch emulation means is supplied with power from the power supply means, and the signal conversion means and the operation control means are operable by the power supplied from the digital line. A terminal adapter device characterized by the above-mentioned.