JPH04150365A - Facsimile line changeover device - Google Patents

Abstract

PURPOSE:To switch a facsimile equipment during transmission through a wired line into a radio line quickly by adding a circuit whose polarity is switched with emergency command information resulting from the interruption of the transmission when the polarity of a DC power supply of the facsimile equipment is changed to the switching device. CONSTITUTION:When the polarity of a DC power supply 11 of a facsimile equipment 1 is inverted, a line 2 is opened and the facsimile equipment is in standby. Upon the receipt of emergency command information, a radio equipment 18 sends a start signal 15 to a control section 14, as soon as the section 14 outputs a switching signal 20 to a line switching section 5, the section 14 outputs an inverting signal 16 to a DC voltage inversion circuit 10 and the circuit 10 switches the polarity of the DC power supply 11. As a result, the facsimile equipment 1 detects the polarity inversion of the power supply, the transmission is immediately interrupted, and the facsimile equipment 1 receives information from the radio equipment 18 simultaneously and receives surely the radio emergency information.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a facsimile line switching device, and particularly to a facsimile line switching device that switches information from a wired line or a wireless line for emergency communication and outputs it to a standard facsimile device. Regarding.

[Conventional technology]

A facsimile switching device (hereinafter referred to as an adapter) attached to a facsimile machine (hereinafter referred to as FAX) normally performs communication using the 03 procedure over a wired line, but in an emergency, it switches to a wireless line to receive information from the center station. When an activation signal was input to the adapter via the wireless device from the wireless line, the wireless line and facsimile machine were forcibly connected, and communication over the wired line was interrupted.

FIG. 2 is a block diagram of an example of a conventional facsimile line switching device. Normally when connected to one wired line, F
Line (1, 1, L2) 2 of AXl is connected to line transformer 3
．． Hybrid circuit 4. Switching unit 5. Hybrid circuit 1
G3 facsimile communication is performed via G2 and line transformer 13.

Upon receiving the emergency reception command from the center station, the radio device 1.8 sends an activation signal 15 to the controller 14 of the adapter. The control unit 14 outputs a switching signal 20 to the switching unit 5 based on the activation signal 15, and the switching unit 5 switches the line to the wired line 1 based on the switching signal 20.
Switch from 1 to wireless 1118, FAX1 and wired line 1
The communication path with 9 is disconnected.

The fax machine whose communication path is disconnected will immediately go into a standby state because the carrier is disconnected during reception, or it will not go into a standby state while the image signal is being sent during transmission, but the other party's fax will be interrupted between pages of the transmitted document. In response to the procedure abnormality, the FAX line 2 is opened, the DC loop formed by the DC power supply 11 via the line transformer 3 is disconnected, and the detection circuit 9 disconnects the loop (OFF) using the loop detection signal 17. Output to. By opening the loop of line 2, the control unit 14
Line 2 from AXI is connected to line transformer 3, hybrid circuit 4. Switching unit 52 Procedure conversion unit (converts standard G3 procedure and wireless unidirectional procedure) 6-line transformer transmission 7.
A communication path with the radio device 18 is formed via the line transformer receiving device 8, and communication information from the radio device 18 is received preferentially.

[Problems to be Solved by the Invention] The conventional facsimile line switching device described above is
The FAX1 communication path is forcibly disconnected by the activation signal from 8, and while the FAX1 is being received, the signal can be cut off and the FAX1 can be put into standby mode immediately, but when the FAX1 is being sent, the communication procedure with the next page will be interrupted after the page has been sent. Since the system cannot be placed on standby until the process is completed, it has the disadvantage that urgent information cannot be immediately received from the wireless line.

[Means to solve the problem]

The facsimile line switching device of the present invention is a facsimile line that opens the line when the polarity of the DC voltage of a line that is closed during communication is reversed, and connects the facsimile device that goes into standby mode to a wired line or a wireless line from a wireless device. The switching device includes means for inverting the polarity of the DC voltage in response to an activation signal from the wireless device, and means for connecting the facsimile device to the wireless line when the polarity is reversed.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

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

In this embodiment, a line (L1) is closed during communication.

L2) When the polarity of the DC power supply 11 of 2 is reversed, LI
The line switching operation that opens line 2 of L2 and connects the facsimile machine (FAXI), which goes into standby mode, to the wired line 19 or the wireless line from the wireless device 18 is performed by an activation signal from the wireless device 18 into which emergency command information has been input. 15, a control unit 14 and a DC voltage inverting circuit 10 that invert the polarity of the DC power supply 11, and a DC loop detection circuit 9 that detects the line 1 in which the FAX1 loop is opened by inverting the polarity of the line 2 and outputs it as a DC loop detection signal 17. and a control section 14 which causes the line switching section 5 to connect the FAX 1 and the wireless device] 8 using the DC loop detection signal 17.

Next, the operation of this embodiment will be explained.

Normally, the FAX line (1-1, ■=2>2 is connected to one wired line via line transformer 3.hybrid 1 to circuit 4.switching unit 5, hybrid circuit 12.line transformer 13, and communication is possible. It will be done.

The radio device 18 sends an activation signal 15 to the control unit 14 upon receiving the emergency command information. The control unit 14 receives the activation signal 1
5 outputs the switching signal 20 to the line switching section 5 and at the same time outputs the DC voltage inversion signal 16 to the DC voltage inversion circuit 10. The DC voltage inversion circuit 10 is connected to the line (LL, L2) 2
Switch the polarity of the DC power supply (48V) 11 applied to the

In this way, the FAX1 being sent will be sent to the LL of line 2.
, ' upon detecting that the polarity of L2 has changed, the transmission operation is immediately interrupted and information from the radio 18 can be received.

It should be noted that the interruption during reception and the operation after the interruption are the same as in the conventional example, so a description thereof will be omitted.

[Effects of the Invention] As explained above, the present invention quickly switches a facsimile device currently transmitting over a wired line to a wireless line by adding a DC voltage application circuit that has a function of reversing the polarity of the facsimile line. This has the effect of ensuring that emergency information can be received wirelessly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an example of a conventional facsimile line switching device. ]...Facsimile, 2...Line (Ll, L2)
, 3.7, 8.13... line I-lance, 4...
Circuit to high flip 1, 5... Line switching unit, 6... Procedure conversion unit, 9... DC loop detection circuit, 10... DC voltage inversion circuit, 11... DC voltage, 12... Hybrid circuit, 14...Control unit, 15...Start signal, 16...DC voltage inversion signal, 17...DC loop detection signal, 18...Radio device, one...Wired line, 2
0...Line switching signal.

Claims (1)

[Claims] In a facsimile line switching device that connects a facsimile device that opens the line and enters a standby state when the polarity of a DC voltage of a line that is closed during communication is reversed to a wired line or a wireless line from the wireless device, A facsimile line switching device comprising: means for reversing the polarity of the DC voltage in response to a start signal; and means for connecting the facsimile device to the wireless line when the polarity is reversed.