JPH11285037A - Terminal adaptor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal adaptor that makes communication efficiently at a low cost. SOLUTION: A user network interface circuit 11 of the terminal adaptor 10 is connected to an ISDN 90 and a private branch of exchange 50 is connected to analog ports 16, 26. In the case of receiving telephone number information of a terminal making a connection request from a caller side via the ISDN 90 and representative transmission information corresponding to the telephone number information, an operation control circuit 35 calls the private branch of exchange 50 connecting to the analog ports 16, 26 based on the representative telephone number information. When a reply is detected, a PB signal transmission reception circuit 153 (253) outputs a pushbutton signal based on the telephone number information of the terminal. The private branch of exchange 50 for an analog public communication line connects to the ISDN 90 to receive the dial-in service. Moreover, since one line of the ISDN 90 can communicate by two analog lines of the private branch of exchange 50, the communication is conducted efficiently at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a terminal adapter device. Specifically, when a connection request is made from the calling side, and when the telephone number information and the representative telephone number information of the terminal requesting the connection are supplied from the digital public communication line, for example, the analog Calls the private branch exchange connected to the line, and after connection with the private branch exchange, outputs a signal indicating the telephone number information of the terminal requested to connect via this analog line to the private branch exchange, And a terminal connected to the private branch exchange.

[0002]

2. Description of the Related Art Conventionally, in offices such as companies and factories,
Private branch exchanges are used to make telephone calls between offices and between the office and the outside. FIG. 3 shows a configuration of a conventional communication system. The private branch exchange 50 and the exchange 95 on the communication carrier side are connected via an analog public communication line.
Is connected.

[0003] Here, when calling any one of the connected telephone 51 _-1 to 51 _-n in the private branch exchange 50 at the incoming side from the originating phone 100, dial-contract is made between the called party and the operators In this case, the exchange 95 calls the private branch exchange 50 with the representative telephone number corresponding to the telephone number called from the calling side. When the private branch exchange 50 and the exchange 95 are connected by the representative telephone number, a push button signal (hereinafter, referred to as a "PB signal") indicating a telephone that has been called from a group of telephones organized as the representative telephone number is exchanged. 95 to the private branch exchange 50. The PB signal is a DTMF (Dual Tone Mull) composed of two audio frequency signals having different frequencies.
The private branch exchange 50 connects the telephone set 51 called based on the PB signal to the exchange 95.

For example, a telephone number "XX00-XX10"
Is dialed in as the representative telephone number “XX00”, the telephone 51 of the telephone number “XX06” is transmitted from the calling side.
-6, this telephone number "XX06"
Is included in the dial-in contracted telephone number of the representative telephone number “XX00”, the private branch exchange 50 is called from the exchange 95 with the representative telephone number “XX00”. Here, when the exchange 95 is connected to the private branch exchange 50 on the receiving side, a PB signal indicating the telephone 51-6 having the telephone number "XX06" is supplied from the exchange 95 to the private branch exchange 50. In the private branch exchange 50, based on the PB signal, the telephone number "X
When the telephone 51-6 of "X06" is called and the telephone 51-6 of the telephone number "XX06" is set to the off-hook state, the telephone 51-6 of the calling side is exchanged with the private branch exchange 50 and the exchange 95 of the communication carrier. A call can be made with the desired telephone 51-6.

[0005] By receiving the dial-in service using the private branch exchange as described above, it is not necessary to directly connect each telephone to the analog public communication line, so that the line can be used efficiently and the cost is low. can do.

[0006]

By the way, when a private branch exchange is used, if telephones connected to the private branch exchange are added, many telephones are connected to a communication line with the outside, and it is difficult for the telephones to be connected. turn into. In such a case, it is necessary to increase the number of communication lines between the exchange of the telecommunications carrier and the private branch exchange, etc., so that it is not possible to easily add telephones connected to the private branch exchange. In addition, the cost required for communication increases due to the increase in the number of communication lines.

In view of the above, the present invention provides a terminal adapter device capable of inexpensively and efficiently communicating.

[0008]

According to the terminal adapter device of the present invention, the telephone number information of the terminal for which the connection request has been made from the calling side and the representative telephone number information corresponding to the telephone number information are stored in a digital public communication line. And a signal output means for outputting a signal based on the telephone number information of the terminal for which a connection request has been made, calling from an analog line based on the representative telephone number information, detecting a response, and connecting. Operation control means for outputting a signal indicating telephone number information of the requested terminal from the signal output means to the analog line.

According to the present invention, when the telephone number information of the terminal for which the connection request has been made from the calling side and the representative telephone number information corresponding to this telephone number information are supplied from a digital public communication line, for example, ISDN, For example, a private branch exchange connected to the analog line is called based on the representative telephone number information. When a connection is made with the private branch exchange, a signal indicating the telephone number information of the terminal that has made the connection request is supplied to the private branch exchange, and the calling side and the terminal connected to the private branch exchange are line-connected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the private branch exchange 50 is connected to a terminal adapter device 10, and the terminal adapter device 10 is an integrated services digital network (ISDN) which is a digital public communication line.
(Etwork) 90 is connected to the exchange 95 on the communication carrier side. Here, the terminal adapter device 10 has analog ports 16 and 26 and a digital port 32,
The private branch exchange 50 is connected to the analog ports 16 and 26 of the terminal adapter device 10. The ISDN 90 includes two user information transfer channels (hereinafter referred to as “B channels”) having a transmission rate of 64 kbps and a transmission rate of 1
It has a structure of a 6 kbps signal information transfer channel (hereinafter referred to as "D channel"), and information of a plurality of channels is multiplexed and transmitted.

FIG. 2 shows the configuration of the terminal adapter device 10. The user network interface circuit 11 of the terminal adapter device 10 connected to the line terminating device 80 (not shown in FIG. 1) includes a signal control circuit 12 and an operation control circuit 35.
When a signal is supplied from the ISDN 90 on the B channel or the D channel, the user information signal on the B channel is supplied to the signal control circuit 12, and
Information is extracted from the channel signal and a signal DT indicating this information is supplied to the operation control circuit 35. When a data signal from a D / A / A / D conversion circuit (to be referred to as a “CODEC circuit” hereinafter) 14 or a CODEC circuit 24 to be described later is supplied as a user information signal via the signal control circuit 12, this user information Let the signal be a B-channel signal. When a circuit-switching signal is generated based on a control signal SC from the operation control circuit 35, the circuit-switching signal is used as a D-channel signal. The B-channel and D-channel signals are transmitted from the user network interface circuit 11 to the I
Output to SDN 90.

The signal control circuit 12 selects one of the two CODEC circuits 14 and 24 and converts the user information signal supplied from the user network interface circuit 11 into a signal.
Supply to the selected CODEC circuit. Also, the selected C
When a data signal is supplied from the ODEC circuit, the data signal is supplied to the user network interface circuit 11 as a user information signal. Further, the user information signal supplied from the user network interface circuit 11 is subjected to a protocol conversion process and a speed conversion process of a communication speed, and is supplied to the DTE interface circuit 31.

The CODEC circuit 14 is connected to the telephone interface circuit 151 of the emulation block 15. Here, the CODEC circuit 14 converts the digital data signal supplied from the signal control circuit 12 into an analog voice signal, and converts it into a telephone interface circuit 15.
Feed to 1. Also, the telephone interface circuit 151
Is converted into a digital data signal and supplied to the signal control circuit 12. In addition,
The CODEC circuit 24 is the same as the CODEC circuit 14, and the description is omitted.

In the telephone interface circuit 151 of the emulation block 15, the private branch exchange 50 is set to the off-hook state to detect whether or not the current flows.
In step 2, a control signal RC for generating a dial tone signal and supplying it to the private branch exchange 50 is generated. Also, a call signal is generated by the call signal transmission circuit 152 and the private branch exchange 50
When it is detected that the private branch exchange 50 is in the off-hook state and the current has flowed while the
A control signal RC for stopping generation of a call signal in the call signal sending circuit 152 is generated. The telephone interface circuit 151 also performs a 2-wire to 4-wire conversion process for converting a 4-wire signal of a digital communication path into a 2-wire audio signal, or converting a 2-wire audio signal from the private branch exchange 50 to a 4-wire signal. Do.

A PB signal transmission / reception circuit 153 is connected to the telephone interface circuit 151, and a PB signal (push button dial signal) is transmitted from the private branch exchange 50 to the PB signal.
It is supplied to the B signal transmitting / receiving circuit 153. The PB signal transmission / reception circuit 153 determines the number of the dial button operated based on the PB signal, and supplies the operation control circuit 13 with a signal NB indicating the determined number. The PB signal transmitting / receiving circuit 153 serving as a signal output unit generates a PB signal based on the control signal NC from the operation control circuit 13 and supplies the PB signal to the private branch exchange 50.

The oscillating circuit 30 includes a calling signal transmitting circuit 152.
Is connected, and generates a dial tone signal (400 Hz) and a calling signal using the oscillation signal CK from the oscillation circuit 30. The generated dial tone signal and call signal are supplied to the private branch exchange 50 via the reverse circuit 154. The supply of the dial tone signal and the calling signal to the private branch exchange 50 is controlled based on the control signal RC from the telephone interface circuit 151 as described above.

The reverse circuit 154 performs a call when the call signal (16 Hz) generated by the call signal sending circuit 152 is supplied to the private branch exchange 50 connected to the analog port 16 or calls the called side. The private branch exchange 5 from the telephone interface circuit 151
A process of reversing the direction of the current supplied to 0 is performed.

The emulation block 25 connected to the CODEC circuit 24 has the same configuration as the emulation block 15 and will not be described. An analog port 26 is connected to the emulation block 25 in the same manner as the emulation block 15.

The DTE interface circuit 31 performs signal level conversion on an information signal supplied from the signal control circuit 12 and subjected to protocol conversion processing and communication speed conversion processing. The information signal having undergone the signal level conversion is supplied to the digital port 32. When an information signal is supplied through the digital port 32, the reverse process is performed and the information signal is supplied to the user network interface circuit 11.

The operation control circuit 35 is constituted by using a microcomputer, a memory or the like, generates a control signal MC based on a signal DT from the user network interface circuit 11, and generates a control signal MC. , 24, emulated blocks 15, 25, DTE
The operation of the interface circuit 31 and the like is controlled. Also,
The signal NC generated based on the signal DT is supplied to the PB signal transmitting / receiving circuits 153, 253, and the PB signal generated based on the signal NC in the PB signal transmitting / receiving circuits 153, 253 is supplied to the analog ports 16, 26. . further,
A control signal SC is generated based on the signal NB from the PB signal transmitting / receiving circuits 153 and 253, and a line switching signal is generated in the user network interface circuit 11 based on the control signal SC. Connection processing is performed.

Next, the operation will be described. As shown in FIG. 1, the analog ports 16 and 2 of the terminal adapter device 10 are provided.
The 6 is connected to the private branch exchange 50, when calling here either connected telephone 51 _-1 to 51 _-n from the originating phone 100 to private branch exchange 50 at the incoming side, carriers and Called Party When a dial-in contract is made on the caller side, a call setting request is made from the exchange 95 to the terminal adapter device 10 via the D channel with a representative telephone number corresponding to the telephone number called from the calling side. In response to this call setting request, the private branch exchange 50 and the exchange 95 are connected via an analog line on the analog port 16 side or an analog line on the analog port 26 side.

In the call setting request, the calling telephone 10
The connection number information indicating the telephone set 51 connected to the private branch exchange 50 on the called side from which the call was made from 0
Is supplied to the terminal adapter device 10.

In the terminal adapter device 10 shown in FIG. 2, a signal DT indicating connection number information is supplied from the user network interface circuit 11 to the operation control circuit 35. The operation control circuit 35 generates a signal NC based on the signal DT. This signal NC is supplied to the PB signal transmission / reception circuit 153 of the emulation block 15 on the analog port 16 side when the private branch exchange 50 and the exchange 95 are connected via an analog line on the analog port 16 side, for example. When the private branch exchange 50 and the exchange 95 are connected via the analog line on the analog port 26 side, the signal is supplied to the PB signal transmitting / receiving circuit 253 of the emulation block 25 on the analog port 26 side.

In the PB signal transmitting / receiving circuits 153 and 253,
Based on signal NC, a PB signal for specifying telephone 51 connected to private branch exchange 50 is generated, and telephone interface circuits 151 and 251 and call signal transmitting circuit 15 are generated.
Output from the analog ports 16 and 26 through 2,252 and the like.

For this reason, the private branch exchange 50 for the analog public communication line is connected via the terminal adapter device 10 to the ISDN
After the line is connected to the terminal 90 via the B channel, the terminal adapter device 10 supplies a PB signal indicating the telephone whose connection has been requested, so that the ISDN 90 is used in the same manner as when communication is performed via the conventional analog public communication line. And can also receive a dial-in service. Further, the communication for two analog lines of the private branch exchange 50 can be performed by one ISDN 90 through the terminal adapter device 10.

By causing the terminal adapter device 10 to output the PB signal indicating the telephone whose connection has been requested, the conventional private branch exchange 5 for the analog public communication line is output.
0 can be connected to the ISDN 90. For example, when an additional telephone is connected to the private branch exchange 50, the analog public communication line connected to the private branch exchange 50 is changed to an ISDN line and the terminal adapter device 10 is provided. If this is the case, the number of connection lines between the private branch exchange 50 and the outside can be increased without performing construction or the like for increasing the number of communication lines between the exchanges of the communication carrier and the private branch exchange.
It is possible to prevent the telephone from becoming difficult to connect due to the additional telephone.

Further, by changing the analog public communication line to the ISDN line and using the terminal adapter device 10, the number of connection lines between the private branch exchange 50 and the outside can be increased. Even the cost can be reduced.

When the private branch exchange 50 is connected to the exchange 95 via a plurality of analog public communication lines, if the analog public communication line is changed to an ISDN line and the terminal adapter device 10 is provided, the exchange 95 Since the number of connected communication lines can be reduced, communication costs can be reduced.

In the above-described embodiment, the PB signal transmitting / receiving circuit 15 is controlled based on the signal NC from the operation control circuit 35.
Although the PB signal is generated in 3,253, the PB signal may be generated by software processing in the signal control circuit 12 or the like and output from the analog port.

In the above-described embodiment, the case where the terminal adapter device 10 is a terminal adapter has been described. However, one digital public communication line can be used as a plurality of analog lines, and a connection is made with a representative telephone number. Thereafter, if the terminal adapter device outputs a PB signal indicating the telephone for which the connection request has been made, the terminal adapter device is called ISDN.
A router or the like can also be used. Further, the ISDN 90 is not limited to the “2B + D” configuration.
If the SDN 90 has the “23B + D” configuration, the number of communication lines connected to the exchange 95 can be further reduced.

[0031]

According to the present invention, when the telephone number information of the terminal for which the connection request is made from the calling side and the representative telephone number information corresponding to the telephone number information are supplied from the digital public communication line, A call is made from the analog line based on the representative telephone number information, and when a connection is made, a signal indicating the telephone number information of the terminal that has made the connection request is output. For this reason, the private branch exchange for the analog public communication line can be connected to the digital public communication line by this terminal adapter device to receive the dial-in service.

As a digital public communication line, ISD
Since information of a plurality of analog lines can be transmitted by one digital public communication line by using N, for example, when adding a terminal connected to a private branch exchange for the analog public communication line, the analog public communication line In addition to switching to a digital public communication line and using this terminal adapter device, it is possible to easily and inexpensively add a terminal without causing a problem that a telephone connection becomes difficult. Furthermore, by switching the existing analog public communication line to a digital public communication line,
By using this terminal adapter device, the number of communication lines with the exchange of the communication carrier can be reduced, so that the communication cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a communication system using 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.

FIG. 3 is a diagram showing a configuration of a conventional communication system.

[Explanation of symbols]

 10 terminal adapter device 16, 26 analog port 35 operation control circuit 50 private branch exchange 51, 100 telephone set 90 ISDN 95 exchange 153, 253 PB signal transmission / reception circuit

Claims (2)

[Claims] 1. A multiplexed information of a plurality of channels from a digital public communication line is separated and output to a plurality of analog lines, and the information from the plurality of analog lines is multiplexed and output to a digital public communication line. When the telephone number information of the terminal for which the connection request has been made from the calling side and the representative telephone number information corresponding to the telephone number information are supplied from the digital public communication line, the connection request is transmitted. Signal output means for outputting a signal based on the telephone number information of the terminal, and calling the analog line based on the representative telephone number information, detecting a response, and receiving the connection request. Operation control means for outputting a signal indicating telephone number information from the signal output means to the analog line. Terminal adapter device. 2. The digital public communication line is an ISDN.
The terminal adapter device according to claim 1, wherein the terminal adapter device is an (Integrated Services Digital Network).