JPH01151867A - Communication system by dbu - Google Patents

Abstract

PURPOSE:To effectively utilize a public line by allowing a 2nd switching means to connect the public line and a peripheral equipment when a 1st switching means switches the transmission path of communication information into a private line. CONSTITUTION:The 1st switching means 111 applies switching whether a transmission path of communication information uses a private line or a public line. The 2nd switching means 21 switches the connection between the public line and the 1st switching means 111 or the connection between the public line and the peripheral equipment 131. When the 1st switching means 111 switches the transmission path of communication information to a private line, the 2nd switching means 121 connects the public line and the peripheral equipment 131. Thus, the public line and the peripheral equipment 131 are connected in the case of the communication via the private line. Then the public line is effectively utilized.

Description

[Detailed Description of the Invention] [Table of Contents] Overview Industrial Field of Application Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems Action Example ■, Correspondence between the Example and Figure 1 Relationship ■, Structure of Example ■, Operation of Example (i) Communication operation via dedicated line (ii) Facsimile communication operation (iii) Calling operation when a failure occurs (iv) Hook state detection operation of telephone (v ) Incoming call operation when a failure occurs ■ Summary of embodiments ■ 1 Variations of the invention Effects of the invention [Summary] A communication system using a DBU in which peripheral devices communicate via a public line connected to the DBU With regard to this, in a DBU communication system in which communication information is sent and received by switching the transmission line to a dedicated line or a public line for the purpose of effectively utilizing public lines, the first switching means for switching the transmission line for communication information is , comprising a second switching means for switching between connecting the public line and the first switching means, or connecting the public line and the peripheral device,
The system is configured such that when the first switching means switches the communication information transmission path to the dedicated line, the second switching means connects the public line and the peripheral device.

[Industrial Application Field] The present invention relates to a communication system using a DBU, and in particular, the present invention relates to a communication method using a DBU.
The present invention relates to a communication system using a DBU in which peripheral devices communicate via a public line connected to a DBU.

[Conventional technology]

Generally, a terminal device at a financial institution or the like is connected to a host computer installed at a center via a dedicated line or public telephone line. In particular, when the amount of communication data is large, connections are often made via dedicated lines. In that case,
A detour transmission path using a public telephone line is secured, and when a failure occurs in the dedicated line, data is exchanged via the detour transmission path.

FIG. 3 shows the configuration of a conventional example when a detour transmission path is formed using a DBU (dual line backup unit).

In the figure, the DBU 321 includes four relays 323.3
25, 341, 343, two DC holding circuits 331,
333.

The modem 313 is a data terminal equipment (hereinafter referred to as DTE)
It modulates the transmission data supplied from 311, and sends the data from the transmission end S to the dedicated line 317 via the relay 323 of the DBU 321. In addition, data sent to the DBU 321 via the dedicated line 319 is sent to the relay 3
25 to the receiving end R of the modem 313, demodulated by the modem 313, and input to the DTE 311.

For example, when a failure occurs in the dedicated line 317 or 319, the DBU 321 connects the data transmission path with the DTE 311 from the dedicated line 317, 319 to the public line 361.
, 363.

First, the operator makes a call using the telephone a351 and establishes a line connection with the communication destination via the public line 361. Similarly, the operator makes a call using the telephone 353 and establishes a line connection with the communication destination via the public line 363.

After connecting the line, the four relays 323.3 in DBU321
Switch the connection status of 25, 341, and 343. Thereby, data supplied from the transmitting end S of the modem 313 to the DBU 321 is transferred to the relay 323, the DC holding circuit 331.
It is output to the public line 361 via the relay 341. Similarly, data sent to the DBU 321 via the public line 363 is transmitted to the relay 343. DC holding circuit 333. The signal is supplied to the receiving end R of the modem 313 via the relay 325. Therefore, communications that were previously performed via the dedicated lines 317 and 319 can be performed via the public lines 361 and 363.

[Problem that the invention seeks to solve]

By the way, in the conventional system mentioned above, the public line 36
1 and the public line 363 were used only when a failure occurred in the dedicated line 317 or 319 (including a failure in the transmission equipment installed in the middle of the dedicated line), so they were not used during normal communication. Not being used effectively
The problem was that it was wasteful.

The present invention was created in view of these points, and an object of the present invention is to provide a communication system using a DBU that makes effective use of public lines.

[Means for solving problems]

FIG. 1 is a principle block diagram of a communication system using a DBU according to the present invention.

In the figure, a first switching means 111 in a DBU communication system that switches the transmission path to a private line or a public line to transmit and receive communication information switches the transmission path of the communication information.

The second switching means 121 connects the public line to the first switching means I.
II or connect the public line and peripheral device 131
Switch whether to connect or not.

Overall, the configuration is such that when the first switching means 111 switches the communication information transmission line to the dedicated line, the second switching means 121 connects the public line and the peripheral device 131.

[For production]

The first switching means 111 switches the communication information transmission path between a dedicated line and a public line.

The second switching means 121 connects the public line to the first switching means 1.
11 or between the public line and the peripheral device 131.

When the first switching means 111 switches the communication information transmission path to the dedicated line, the second switching means 121 connects the public line and the peripheral device 131.

In the present invention, by connecting the public line and the peripheral device 131 while communicating via the dedicated line, the public line can be effectively utilized.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 shows the configuration of an embodiment to which the DBLI communication system of the present invention is applied.

■: The correspondence between the embodiment of the present invention and FIG. 1 will now be shown.

The first switching means 111 includes a relay 211. relay 2
It corresponds to 13.

The second switching means 121 includes a relay 221. relay 243
corresponds to

Peripheral device 131 corresponds to facsimile machine 231.

Examples of the present invention will be described below assuming that the correspondence relationship as described above exists.

In FIG. 2, transmission data output from the DTE 291 is modulated by the modem 281 and output to the dedicated line 283 via the DBU 200. Data sent via the dedicated line 285 is input to the DBU 200, and further,
The signal is demodulated by the modem 281 and input to the DTE 291.

In addition, the DBU 200 can be used to make calls to the public line 26.
A telephone set 261 for connecting the 3,265 telephone, and a facsimile device 231 for facsimile communication via a public line 263 are connected.

The DBU 200 includes a main control unit 201 that controls the entire DBU 200, and six relays 211, 213, and 221.
, 243, 253, 255 and two DC holding circuits 24
1.251, a detection circuit 257 for detecting the hook state of the receiver of the telephone 261, and a ringer 259 for detecting a ringing signal from an external telephone.

The above-mentioned relay is assumed to have one movable contact and two fixed contacts.Hereafter, in each relay, the terminal to which the movable contact is connected is the T terminal, and the terminal to which the fixed contact is connected is a normal dedicated terminal. The explanation will be made assuming that the terminal that comes into contact with the movable contact during communication via the line is the B terminal, the fixed contact is connected, and the terminal on the opposite side from the B terminal is the M terminal.

The transmitting end S of the modem 281 is connected to the T terminal of the relay 211, the B terminal of the relay 211 is connected to the external dedicated line 283, and the M terminal of the relay 211 is connected to the DC holding circuit 241.
It is connected to the relay 2430M terminal via.

Similarly, the receiving end R of modem 281 is connected to T of relay 213.
The B terminal of the relay 213 is connected to the external dedicated line 285, and the M terminal of the relay 213 is connected to the M terminal of the relay 253 via the DC holding circuit 251.

The T terminal of the relay 243 is connected to an external public line 263, and the B terminal of the relay 243 is connected to the T terminal of the relay 221. Further, the B terminal of the relay 221 is connected to the facsimile machine 231, and the M terminal of the relay 221 is connected to the B terminal of the relay 253.

It is connected to the B terminal of relay 255 and ringer 259.

The T terminal of the relay 255 is connected to an external telephone 261, and the M terminal of the relay 255 is connected to a detection circuit 257.

A T terminal of the relay 253 is connected to an external public line 265.

In addition, the DTE291 has a modem 281 and a DBU200.
The data exchange between the DTE 291 and the modem 281 is connected to the main control unit 201 of the DTE 291.
Control data is input to the main control unit 201 from the main control unit 201 . Furthermore, the main control unit 201 and modem 281 are connected.

In the DBU 200 shown in FIG. 2, the main control section 201 is connected to each of the other components, and connection lines are omitted.

-1-Removal II by Miyama Next, the operation of the communication system using the DBU according to the embodiment of the present invention described above will be explained. In addition, unless otherwise specified, DB
In the six relays in U200, it is assumed that the movable contacts connected to the T terminals are in contact with the fixed contacts connected to the B terminals.

Reference is made to FIG. 2 below.

i, tongue φ usually DBU2
In the relay 211 of No. 00, the variable contact connected to the T terminal is in contact with the fixed contact on the B terminal side. Therefore, the transmitting end S of the modem 281 is connected to the dedicated line 283 via the relay 211.

Similarly, in the relay 213 of the DBU 200, the variable contact connected to the T terminal is in contact with the fixed contact on the B terminal side. Therefore, the receiving end R of the dedicated line 283 is
It is connected to 285 via relay 213.

Therefore, the DTE 291 can transmit data via the dedicated line 283 and receive data via the dedicated line 285.

j Facsimile 1゛ Since public line 263 and public line 265 are in a standby state (not in use) during the above-mentioned "(i) communication operation via dedicated line", facsimile transmission via public line 263 is not possible. communicate.

The movable contact connected to the T terminal of relay 221 of DBU 200 is in contact with the fixed contact on the B terminal side, and the movable contact connected to the T terminal of relay 243 is in contact with the fixed contact on the B terminal side. There is.

Therefore, facsimile machine 231 is connected to relay 221.24.
The facsimile machine 231 is connected to a public telephone line 263 via the facsimile machine 231, and it is possible to make a call from the facsimile machine 231, establish a line connection with a communication destination, and transmit image information. Conversely, it is possible to receive image information by making an incoming call in response to a calling signal from a communication destination.

Note that at this time, the telephone 261 can be used as a general telephone.

iii Medium H5...φ Next, a failure occurs in the dedicated line 283 or 285,
Data communication via these dedicated lines becomes impossible,
Consider instead a case where data communication is performed via public line 263 and public line 265.

In normal conversations using telephone lines, it is possible to send and receive voice over a single public line (telephone line).
When using a public line as a detour for a dedicated line, two public lines are used in consideration of the amount of communication data (data transfer speed).

First, the main control unit 201 makes a call and
65 is connected to the communication destination, and then the public line 263 is connected to the communication destination.

In the case of automatic calling, first the main control unit 201 activates the relay 255.
After bringing the movable contact into contact with the M terminal side, a pulse generation instruction is sent to the relay 253.

In response to the instruction, the relay 253 sends a dial pulse signal corresponding to the telephone number of the communication destination (the telephone number is different because the public line 265 uses a different line from the public line 263) via the public line 265, A line connection is established with the communication destination. Note that after that, the movable contact of the relay 253 remains in contact with the M terminal side.

Similarly, the main control unit 201 controls the movable contact of the relay 221 to
After making contact with the terminal side, a pulse generation instruction is sent to the relay 243. In response to the instruction, the relay 243
The movable contact connected to the terminal and the fixed contact connected to the B terminal are turned on and off to generate a dial pulse signal corresponding to the telephone number of the communication destination. The dial pulse signal is sent to an exchange (not shown) via the public line 263, and a line connection with the communication destination is established. Note that after that, the movable contact of the relay 243 remains in contact with the M terminal side.

When the communication destination is connected via the public line 263 and the public line 265, the main control unit 201 then connects the relay 211.
213 to switch each connection state. The movable contacts connected to the T terminals of the two relays are brought into contact with the fixed contacts on the M terminal side.

Therefore, the data output from the output terminal S of the modem 281 is transmitted to the relay 211. DC holding circuit 241° relay 243
is transmitted to the public line 263 via the public line 263. Furthermore, data sent via the public line 265 is sent to the relay 253.
Modem 28 via DC holding circuit 251° relay 213
1 receiving end R.

In the above-described call, a dial pulse signal is generated, but the main control unit 201 instructs the modem 281 to output a button signal (audio frequency signal), and the button output from the modem 281 is Line connection is also possible by sending the button signal to the exchange via the public line 263 and the public line 265.

In addition, when making a manual call using the external telephone 261, the operator first operates the telephone 261,
A dial pulse signal (or pushbutton signal) is sent via relays 255 and 253 to establish a line connection.

Next, main control unit 201 switches relays 253 and 221 (switches to the M terminal side). After that, the operator operates the telephone 261 to connect the relays 255, 221,
A dial pulse signal (or pushbutton signal) is sent out via H.243 to establish a line connection.

(iv) Hook-shaped ζ of the telephone When the telephone 261
The operation of detecting the hook state of the telephone receiver will be explained below.

During the data communication in the above-mentioned ``(iii) Calling operation when a failure occurs'', the main control unit 201 sends an instruction to the relay 255 to switch the connection state. Since the movable contact connected to the T terminal of the relay 255 is in contact with the fixed contact on the B terminal side, the movable contact is brought into contact with the fixed terminal on the M terminal side. This connects the detection circuit 257 and the telephone 261.

The detection circuit 257 supplies a predetermined current to the telephone set 261 and measures the returned current value to detect the hook state of the receiver. When the handset of telephone 261 is in the hook-off state, the hook switch is turned on, and the circuit including the hook switch forms a loop.

Therefore, the current output from the detection circuit 257 is supplied to one end of the loop, and the detection circuit 257 measures the current value returned to the detection circuit 257 from the other end of the loop.

The detection circuit 257 sends information regarding the hook state to the main control unit 201 according to the returned current value.

When the handset is in the hook-off state, "1" is sent, and when the handset is in the hook-on state, "OI+" is sent.

For example, the main control unit 201 recognizes that the handset of the telephone set 261 is in the hook-off state based on the signal '°1'' sent from the detection circuit 257, and after the communication operation at the time of failure occurs, the relay 253 By switching the
The operator can have a conversation with the communication destination.

(v) Disability Incoming call from the housekeeper φi Next, consider the case where a failure occurs in the dedicated line 283 or 285 and calls are received from the communication destination.

When a failure occurs in the dedicated line 283 or 285 and a call is made from the destination DBU to the DBU 200, the ringer 259 first calls the public line &H65,
A call signal is received via relay 253. When the main control unit 201 receives a signal corresponding to the reception of the calling signal from the ringer 259, it switches the relay 253 (switching to the M terminal side) to receive the call.

Next, the main control unit 201 switches the relay 221 to the M terminal side, and switches the public line 263. relay 243, relay 22
The ringer 259 receives a calling signal sent from the communication destination via the ringer 259. When the main control unit 201 receives a signal corresponding to the reception of the calling signal from the ringer 259, the main control unit 201 controls the relay 2
43 to the M terminal side to receive a call.

Next, the main control unit 201 controls the relay 211 and the relay 21
Switch 3 to the M terminal side. From now on, public line 263,2
Data communication via 65 is possible.

Incidentally, if a fault occurs in the dedicated line 283 or 285 and the DBU 200 receives a wrong call and the line is connected by the wrong call, problems will occur in data communication. In order to prevent a line connection due to an incorrect call, after the line is connected, a test signal is sent from the DBU 200, the returned signal is analyzed, and the line connected due to an incorrect call is disconnected.

Summary of U As described above, the DTE 291 normally performs data communication via the modem 281 and the dedicated lines 283 and 285. At this time, the public line 263 is connected to the facsimile machine 231 via relays 243 and 221, and the facsimile machine 231 sends and receives image information to and from other facsimile machines via the public line 263.

Further, when a failure occurs in the dedicated lines 283 and 285, a manual call is made by the telephone 261 or an automatic call is made under the control of the main control unit 201. After connecting the line with the communication destination by making those calls, the main control unit 201 controls the relay 2
11 and relay 213. After that, DTE2
91 is a modem 281. DBU200 and public line 26
Data communication is performed via 3,265.

When a call is received in response to a call signal from the communication destination when a failure occurs, first the ringer 259 is sent via the relay 253.
receives a calling signal and receives a call, then relays 243, 2
The ringer 259 receives the calling signal via the telephone 21 and makes an incoming call. DTE 291 then connects modem 281. D
Data communication is performed via the BU 200 and public lines 263 and 265.

Therefore, it is possible to perform image information communication on the facsimile device 231 in parallel with data communication via the normal private lines 283 and 285, thereby making effective use of the public line.

Further, by configuring the DBU 200 as shown in FIG. 2, the following advantages can also be obtained.

■Automatic calling/receiving at the DBU 200 becomes possible.

■When making a manual call, only one telephone is required.

(2) It is possible to detect the hook state of the telephone 261 during data communication.

■Half-duplex communication is possible only with public line 265, and DB
U200 can also operate as a network control unit (NCU).

■Modifications of the invention In the embodiment of the invention described above, DBU20
Although we considered facsimile device 231 as a peripheral device connected to 0, other devices (for example, DTE via modem)
But that's fine.

Further, in the embodiment, the DBU 200 and the modem 281 were considered separately, but in an integrated device, the DT
Control between E291 and main control unit 201 in accordance with CCITT Recommendation V
, 25 bis, in which case D
Connection between the TE 291 and the main control unit 201 becomes unnecessary.

Furthermore, in rl, the correspondence J between the example and FIG. 1,
Although the correspondence between the present invention and the embodiments has been described, those skilled in the art will easily assume that the present invention is not limited to this and that there are various modifications.

[Effects of the Invention] As described above, according to the present invention, by connecting the public line and the peripheral device while communicating via the dedicated line, communication by the peripheral device via the public line can be prevented. This method is extremely useful in practical terms.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of a communication method using a DBU of the present invention, FIG. 2 is a block diagram of an embodiment to which the communication method using a DBU of the present invention is applied, and FIG. 3 is a block diagram of a conventional example. In the figure, 111 is a first switching means, 121 is a second switching means, 131 is a peripheral device, and 200 is a DBU. 201 is the main control unit, 211.213, 221, 243, 253, 255 is a relay, 231 is a facsimile machine, 241.251 is a DC holding circuit, 263.265 is a public line, 281 is a modem, 283.285 is a dedicated line , 291 is DTE. Fu9ton 8th 01/! Diagram 1 of the entrance

Claims (1)

[Scope of Claims] A communication system using a DBU that transmits and receives communication information by switching a transmission path to a dedicated line or a public line, comprising: a first switching means (111) for switching the transmission path of the communication information; a second switching means (121) for switching between connecting the line and the first switching means (111) or connecting the public line and the peripheral device (131); (111), when the communication information transmission path is switched to the dedicated line, the second switching means (121) connects the public line and the peripheral device (131). Communication method using DBU.