JPS62234452A - Plural-terminal storing line interface - Google Patents

Abstract

PURPOSE:To attain the reception of a no-ringing terminal and to improve the function and the availability of a subscriber line with an interface circuit, by connecting the no-ringing terminal to the subscriber line case no call signal is received within a fixed time after the inversion of polarity is detected in an incoming mode. CONSTITUTION:A control circuit CPU 21 monitors the inversion of polarity and a call signal IR and closes a port connection switch 24b when no signal IR is detected within a fixed time after the inversion of polarity. Then the switch 24b is connected to a no-ringing data terminal equipment DTE via a loop detecting circuit 23b. When the DTE answer the call signal of a single tone within a voice band, a loop is closed and a communication channel is formed. Then the circuit 23b detects an open state of the loop when the communication is through and therefore the switch 24b is opened. In such a way, the connection of the DTE is possible by providing a connection terminal for DTE to a circuit interface device 2 and adding a prescribed function to the CPU21.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a single telephone line with a plurality of telephones, facsimile communication terminals, image communication terminals, and non-ringing communication terminals (hereinafter collectively referred to as telephone-type communication terminals). (Also called a terminal.)
A multi-terminal accommodating line interface device (hereinafter simply referred to as a line interface device) that accommodates at least one data terminal (also referred to as a non-telephone type terminal) such as a personal computer, and can selectively connect to other external terminals. (also called face device).

[Conventional technology]

As a method of installing a data terminal equipment (simply abbreviated as DTE) on a telephone line, for example, the method shown in FIG. 3 is known. In addition, in the same figure, 1 is a telephone exchange;
3C is a telephone, 5C is a DTE, 7 is a converter, 22 is a network control unit (NCU), 25 is a modem (MODEM)
,Z, is a telephone line.

This is a method in which the DTE is installed as a "telephone connection device" using a converter 7 as shown in the figure.

Here, converter 7 connects telephone line 14. It is connected to the telephone 3C and the data terminal 5C, and serves to connect the line 14 to the telephone 3C or to the terminal 5C by manual operation of the converter 7.

However, since this method relies on manual operation of the converter 7, "telephone calls" and "data communications" are semi-fixed, resulting in various inconveniences. For this reason, recently, telephones with modems (with a built-in network control unit (NCU)) have appeared.

FIG. 4 is a schematic diagram showing a telephone with a modem.

Note that each symbol indicated by \ is the same as in Fig. 3, and T
5 is a connection terminal (also called a port).

That is, this telephone with a modem has a port (terminal T5) for accommodating a DTE, and facilitates connection of the terminal 5C. In this case, the NCU 22 is provided with this function so that the switching operation between the telephone a3C and the terminal 5C is automatically performed, so that "call" and "communication" are not semi-fixed.

[Problem that the invention seeks to solve]

However, such a system has a problem in that it is not possible to connect a so-called non-ringing communication terminal (also referred to as a non-ringing DTE), which calls a terminal without ringing, such as a mini-fax or telemeter terminal. In other words, while the ringing format of silent DTE is performed by reversing the polarity of the telephone line and a single tone within the voice band (300Hz to 340011z), the conventional method uses reversal of polarity and a ringing signal. It's for a reason.

Therefore, an object of the present invention is to provide a line interface device that can also accommodate non-ringing DTEs.

[Means for solving problems]

A plurality of connection terminals for connecting a plurality of telephone terminals each capable of automatically or manually making and receiving calls and a telephone terminal including a silent communication terminal and at least one non-telephone terminal; A terminal interface section that controls the interface, one contact terminal connected to one telephone line, another interface section that controls the interface with the telephone network via this connection terminal, and a non-telephone interface section that controls the interface with the telephone line network. A modulation/demodulation section that modulates and demodulates data communicated between terminals, and a control section that controls each of these sections are provided.

[Effect]

When a non-ringing DTE is connected to the connection terminal for a telephone type terminal, if a ringing signal is not received within a certain period of time after detection of polarity reversal at the time of incoming call, the non-ringing DTE is connected to the telephone subscriber line.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention.

In the figure, 1 is a telephone exchange, 2 is a line interface device accommodating multiple terminals, 3a and 3b are telephones, 4 is a telephone type terminal, 5a and 5b are data terminals, Il, to 1. is a telephone line, and T1 to T3 are connection terminals (ports). In addition,
The line interface device 2 includes a control circuit (CPU) 21.
Polarity reversal detection circuit 22a, calling signal (IR) detection circuit 2
2b1 Busy tone (BT) ・Dial tone (DT)
A detection circuit 22C, a terminal selection signal receiving circuit 22d, a loop closing circuit 22e, and a ringing tone (RBT) sending circuit 22f.

Guidance sending out path 22g, dial signal sending circuit 22
h. Calling signal sending circuit 221. Signal route switching circuit 22j
, timer 221 . Relay control circuit 22m1 Call/response detection circuit 23. Port connection switch 24. It is composed of a modulation/demodulation circuit (MODIEM) 25 and the like.

First, from the other party's telephone 3b to the line interface device 2.
This section explains the procedure to be followed when a call is received.

When there is an incoming call from the other party's telephone a3b, the telephone exchange 1 sends a discharge tone (RBT) to the other party, and a ringing signal (II?) is sent to the telephone line ll.
The polarity of is reversed (one (Ll) of the two-wire system changes from earth to earth and the other (L2) to -48V, L changes to -48V and L2 to earth). When the line interface device 2 detects this reversal, the CPU 21 operates the loop closing circuit 22e and first makes a provisional response. When a selection signal for selecting a telephone terminal or a non-telephone terminal is sent after the provisional response of the line interface device 2, the terminal selection signal receiving circuit 22d receives this signal and then calls the corresponding terminal. Do the following. At this time, the RBT created by the line interface device 2 is sent to the calling side telephone 3b, while the calling signal sending circuit 22i is driven to the telephone 3a housed in the line interface device 2. IR
and make the call. Thereafter, when the call/response detection circuit 23a detects a DC loop and detects a response from the telephone 3a, the calling signal sending circuit 22i and the ringing tone sending circuit 22f are restored and the IR is activated.

The RBT is stopped, the relay control circuit 22m is activated, and the boat connection switch 24a is operated from the bottom to the top in the diagram to connect the line 7!1 and the two-wire communication terminal connection terminal T2 to enable a telephone conversation.

Next, an explanation will be given of the operation when the data terminal 5a is specified by the calling side after the line interface device makes a provisional response.

In this case, the steps up to the provisional response are the same as those described above, so a description thereof will be omitted.

When the line interface device 2 tentatively responds, the CPU 21
Sends a calling signal consisting of a character code to any signal line of the multi-wire communication terminal connection terminal T3 via the signal route switching circuit 22j, or changes the voltage level of the signal line assigned for displaying an incoming call. By doing so, the data terminal 5a is called, and the ringing tone sending circuit 22f is activated to send a message (?) to the calling party. Send BT.

Among the terminals T3, a response signal consisting of a character code is sent back from a signal line assigned for receiving data from a data terminal housed there, or a voltage level change of a signal line assigned for displaying a response, CPU2
1 detects a response from the terminal 5a via the signal route switching circuit 22j, it restores the ringing tone sending circuit 22f and switches to R.
When the BT is stopped, the signal route switching circuit 22j is activated, and all the signal lines of the terminal T3 used for communication with the emitting side ε are connected to the modulation/demodulation circuit 25, and the signal route switching circuit 22j is connected to the modulation/demodulation circuit 25. communication.

On the other hand, when there is an incoming call from the external data terminal 5b,
As in the case of the telephone m3b, the line interface device 2 makes a provisional response, then decodes the selection signal sent from the data terminal 5b from the output of the modulation/demodulation circuit 25, and selects the terminals 4 and 5a specified by this selection signal. The terminal T2. Select from T3 and connect.

The operation when an external non-ringing DTE (not shown) calls the non-ringing DTE accommodated in the line interface device 2 will now be described with reference to FIG. Incidentally, FIG. 2 is a flowchart for explaining the operation.

That is, the CPU 21 monitors the polarity reversal (reverse) and the calling signal (IR) as shown in FIG. , is connected to the non-1!5 dynamic DTE via the call/response detection circuit 23b. When the silent DTE responds to the in-band single-tone paging signal, the loop is closed and a communication path is established. Note that the NR switch indicated by ◎ in FIG. 2 is a switch that is turned on when the non-sounding DTE is connected. Thereafter, when the communication ends and the call/response detection circuit 23b detects the loop opening, the boat connection switch 24b is opened.

In this way, the line interface device 2 has a silent DTE.
By providing a connection terminal and adding a function as shown in FIG. 2 to the CPU 21, it becomes possible to connect (accommodate) a non-sounding DTE.

〔Effect of the invention〕

According to this invention, the line interface device has a ringless D.
When a TE connection terminal is provided, its control circuit (CP
By adding a predetermined function to U), it is possible to easily accommodate a silent communication terminal, and there are advantages that the function can be improved and the telephone line can be used effectively.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a flowchart for explaining the operation according to the present invention, and FIG.
The figure is a schematic diagram showing a conventional example of a data terminal accommodating system, and Fig. 4 is a schematic diagram showing the same (another conventional example). Device, 3a to 3C...Telephone, 4...Telephone type terminal, 5a to 5C...Data terminal (DTE), ?-
...Converter, 21...Control circuit (CPU), 22...
・Network control unit (NCU), 22 a... Polarity reversal detection circuit, 22b... Calling signal (IR) detection circuit, 22
c...Busy tone (BT) ・Dial tone (DT)
Detection circuit, 22d...Terminal selection signal receiving circuit, 22e
...Loop closing circuit, 22f...Ring tone (RBT)
Sending circuit, 22g... Guidance sending circuit, 22h.
...Dial signal sending circuit, 22i... Calling signal sending circuit, 22j... Signal route switching circuit, 22k... Timer length selection switch, 22N... Timer, 22m...
・Relay control circuit, 23 (23a to 23d)...Call/response detection circuit, 24 (248 to 24d)...Port connection switch, 25...Modulation/demodulation circuit (MODEM)
, 11-1°...telephone line, T1 to T3. T5...
Connection terminal (boat). Agent: Akio Namiki, Patent Attorney: Kiyoshi Matsuzaki, Patent Attorney: 2 Amendments to Figure Proceedings Showa 1961: 3, Commissioner of the Patent Office, Kuro 1) Akio Tono 1, Indication of Case Patent Application No. 76598, 1988 No. 2, Name of the invention Line interface device accommodating multiple terminals 3, Relationship to the case of the person making the amendment Patent applicant address 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Name
(422) Shino, Representative of Nippon Telegraph and Telephone Corporation
Tsune (1 idiot) Akira (160, January 111 name changed (all at once) 4, generation
Person ■105 Telephone 03 (580) 951
3 (1 idiot) 7. Contents of amendment 1) The entire specification is amended as shown in the attached sheet. Full text correction specification 1, title of the invention, multiple-terminal non-accommodating type cotton interface device 2, claims: comprising a plurality of connection terminals for accommodating a plurality of non-telephone terminals including telephones and silent communication terminals, - In a line interface device accommodating multiple terminals connected to a subscriber line and capable of selectively communicating with external telephones or non-telephone terminals, a ringing signal is sent within a certain period of time after polarity reversal is detected when the device receives a call. A line interface device accommodating a plurality of terminals, wherein the non-ringing terminal is connected to a subscriber line when the non-ringing terminal is not received. 3. Detailed Description of the Invention [Field of Industrial Application] This invention provides: - In addition to telephones, image communication terminals and non-ringing communication terminals (hereinafter also collectively referred to as telephone-type terminals) are provided on subscriber lines. A multi-terminal accommodating line interface device (hereinafter simply referred to as a line interface device) that accommodates either a computer or a data terminal (also referred to as a non-telephone type terminal), etc., and can selectively connect to other external terminals. (also referred to as face device). [Prior art] A telephone terminal device or a data terminal device (simply,
Also abbreviated as DTE. ) is shown in FIG. 3, for example. In addition, FIG. 3 is an example of D'l''E. In the same figure,
1 is a telephone exchange, 3C is a telephone set, 5C is a DTE, 6 is a converter, 22 is a network control unit (NCU), 25 is a modulation/demodulation unit (MODEM), and It m is a subscriber line. This is a method in which the DTE is installed as a "telephone connection device" using a converter 6 as shown in the figure. Here, the converter 6 connects the subscriber line 14. It is connected to the telephone set 3C and the data terminal 5C, and serves to connect the subscriber line 14 to the telephone set 3C or to the terminal 5C by manual operation of the converter 6. Furthermore, D'
Terminals other than TE are connected to the converter 6 in the same way as the telephone 3C. However, since this method relies on manual operation of the converter 6, it is difficult to communicate between "telephone calls" and "non-telephone communications."
becomes semi-fixed, causing various inconveniences. For this reason, recently, for example, for DTH, a modem-equipped telephone a (with a built-in network control unit (NCU)) has appeared. FIG. 4 is a schematic diagram showing a telephone with a modem. Note that each symbol indicated by \ is the same as in Fig. 3, and T
4 is a multi-wire communication terminal connection terminal (also called a boat). That is, this telephone with a modem has a boat (terminal T4) for accommodating a DTE, and facilitates connection of the DTE terminal 5C. In this case, the NCU 22 is provided with this function so that the switching operation between the telephone 3C and the terminal 5C is automatically performed, so that "call" and "communication" are not semi-fixed. [Problems to be Solved by the Invention] However, with this method, it is not possible to connect a so-called non-ringing communication terminal (also referred to as non-ringing DTE), such as a telemeter terminal, which calls a terminal without ringing. There is a problem. In other words, non-sounding DTE
The calling format is polarity reversal of the subscriber line and within the voice band (3
0011z to 340011z), whereas the conventional method uses polarity inversion and a calling signal. Therefore, an object of the present invention is to provide a line interface device that can also accommodate non-ringing DTEs. [Means for Solving the Problems] The system is equipped with a plurality of connection terminals for accommodating a plurality of non-telephone terminals including telephones and silent communication terminals, and is connected to a subscriber line and connected to an external telephone or non-telephone terminal. In a line interface device accommodating multiple terminals capable of selective communication, if a call signal is not received within a certain period of time after detection of polarity reversal when a call is made to the device, the non-ringing terminal is added. Connect to line. [Function] By doing as described above, it is possible to accommodate non-ringing terminals, and to improve functions and effectively utilize subscriber lines. [Embodiment] FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 1 is a telephone exchange, 2 is a line interface device accommodating multiple terminals, 3a and 3b are telephones, 4 is a telephone type terminal, 5a and 5b are data terminals, 1 and 13 are subscriber lines, and Tl is a A subscriber line connection terminal, T2 is a two-wire communication terminal connection terminal, and T3 is a multi-wire communication terminal connection terminal. Note that the line interface device 2 includes a control circuit (CPU) 21. Polarity reversal detection circuit 22a, calling signal (IR) detection circuit 22b
1 busy tone (BT) - Dial tone (DT) detection circuit 22C1 terminal selection signal receiving circuit 22d, loop closing circuit 22e, ringing tone (RBT) sending circuit 22f. Guidance sending out path 22g, dial signal sending circuit 22
h. Calling signal sending circuit 221. Signal route switching circuit 22j
, timer 221 . Relay control circuit 22m2 Call/response detection circuit 23. Baud 1-connection switch 24. It is composed of a modulation/demodulation circuit (MODEM) 25. First, from the other party's phone a3b to the line interface device 2.
This section explains the procedure to be followed when a call is received. When a call is received from the other party's telephone 3b, a discharge tone (RBT) is sent from the telephone exchange a1 to the other party, and a ringing signal (IR) is sent to the subscriber line 11. 1
1 polarity is reversed (one (Ll) of the two-wire system is earth air and the other (L2) is from -48V, L2 is earth air and Ll is -48V)
Changes to V. ). When line interface device 2 detects this reversal, C
The PU 21 operates the loop closing circuit 22e and first makes a tentative response. When a selection signal for selecting a telephone terminal or a non-telephone terminal is sent after the provisional response of the line interface device 2, the terminal selection signal receiving circuit 22d receives this signal and then calls the corresponding terminal. Do the following. here,
First, the operation when telephone 413a is designated will be explained. At this time, the RBT created by the line interface device 2 is sent to the calling side phone 4m3b, while the RBT created by the line interface device 2 is sent to the phone i3a accommodated in the line interface device 2.
By driving the calling signal output path 22i, the IR is sent out and a calling is performed. After that, the call/response detection circuit 2
3a detects a DC loop and detects a response from the telephone 3a, it restores the ringing signal sending circuit 22i and the ringing tone sending circuit 22f, stops [R, RBT, starts the relay control circuit 22m, and connects the port. The switch 24a is operated from the bottom to the top in the figure to connect the subscriber line 1 and the two-wire communication terminal connection terminal T2 to enable a telephone conversation. Next, an explanation will be given of the operation when the data terminal 5a is specified by the calling side after the line interface device makes a provisional response. In this case, the steps up to the provisional response are the same as those described above, so a description thereof will be omitted. When the line interface device 2 tentatively responds, the CPU 21
to one of the signal lines of the multi-wire communication terminal connection terminal T3 via the signal route switching circuit 22j; sends a calling signal consisting of a 1-Yarakuta code, or changes the voltage level of the signal line assigned for displaying an incoming call. By changing the value, the data terminal 5a is called, the ringing tone sending circuit 22f is started, and RBT is sent to the calling side. Among the multi-wire communication terminal connection terminals T3, a signal line allocated for receiving data from a data terminal accommodated therein returns a response signal consisting of a character code, or a signal line allocated for displaying a response. When the CPU 2 i detects a response from the terminal 5 a via the signal route switching circuit 22 j due to a voltage level change, the ring tone sending circuit 2
When 2f is restored and RBT is stopped, the signal route switching circuit 22j is activated, and the multi-wire communication terminal connection terminal T3 is activated.
All of the signal lines used for communication with the transmitting side are connected to the modulation/demodulation circuit 25 to enable communication with the transmitting side. The operation when the calling side calls the non-11θ dynamic DTE accommodated in the line interface device 2 will now be described with reference to FIG. Incidentally, FIG. 2 is a flowchart for explaining such operations. That is, the CPU 21 monitors the polarity reversal (reverse) and the calling signal (IR) as shown in FIG. It is connected to the non-sounding DTB via the loop detection circuit 23b. When the silent DTE responds to the in-band single-tone paging signal, the loop is closed and a communication path is established. Note that the NR switch indicated by ◎ in FIG. 2 is a switch that is turned on when the non-sounding DTE is connected. Thereafter, when the communication ends and the loop detection circuit 23b detects the opening of the loop, the boat connection switch 24b is opened. In this way, the line interface device 2 has a silent DTE.
By providing a connection terminal and adding a function as shown in FIG. 2 to the CPU 21, it becomes possible to connect (accommodate) a non-sounding DTE. Note that, although the case where the line interface device accommodates a telephone, a telephone type terminal, and a data terminal (non-telephone type terminal) has been described above, in some cases, a non-telephone type terminal may not be provided. In such a case, it goes without saying that the signal route switching circuit 22j, timer length switching switch 22k, modulation/demodulation circuit 25, etc. shown in FIG. 1 can be omitted. [Effects of the Invention] According to this invention, the line interface device has a ringless D.
When a TE connection terminal is provided, its control circuit (CP
By adding a predetermined function to U), a silent communication terminal can be easily accommodated, and there are advantages that the function can be improved and the telephone line can be used effectively. 4. Brief description of the drawings Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 2 is a flowchart for explaining the operation of the invention, and Fig. 3
The figure is a schematic diagram showing a conventional example of a data terminal accommodating system, and FIG. 4 is a schematic diagram showing another conventional example. Description of symbols 1... Switchboard, 2... Line interface device accommodating multiple terminals, 3a to 3C... Telephone, 4... Telephone type terminal, 5a to 5C... Data terminal (DTE), 6・
...Converter, 21...Control circuit (CPU), 22...
-Network control unit (NCU), 22a... Polarity reversal detection circuit, 22b... Calling signal (IR) detection circuit, 22c
... Busy tone (BT) ・Dial tone (DT)
Detection circuit, 22d...Terminal selection signal receiving circuit, 22e
...Loop closing circuit, 22f...Ring tone (RI3T
) Sending circuit, 22g...Guidance sending circuit, 22h
...Dial signal sending circuit, 22i... Calling signal sending circuit, 22j... Signal route switching circuit, 22k...
Timer length selector switch, 22N...Timer, 22m.
...Relay control circuit, 23 (23a-23d)...Call/response detection circuit, 24 (24a-24d)...Boat connection switch, 25...Modulation/demodulation circuit (MODEM)
, 11-14...Subscriber line, T1...Subscriber line connection terminal, T2...2-wire communication terminal connection terminal, T3...Multi-wire communication terminal connection terminal, '4... Multi-wire communication terminal connection terminal. ``Yoshichoko Figure 2''

Claims (1)

[Scope of Claims] A plurality of connection terminals for connecting each of a plurality of telephone type terminals including a telephone and a silent communication terminal each capable of automatically or manually making and receiving calls and at least one non-telephone type terminal; A terminal interface unit that controls the interface with the telephone type terminal and the non-telephone type terminal, one connection terminal connected to one telephone line, and an interface with the telephone line network via the connection terminal. a modulation/demodulation unit that modulates and demodulates data communicated between non-telephone terminals; and a control unit that controls each of the above units, and the control unit controls the polarity reversal after detecting polarity reversal at the time of incoming call. A line interface device accommodating multiple terminals, characterized in that when a calling signal is not received within a certain period of time, the silent communication terminal is connected to a telephone line.