JPH04119068A - Line switching device for facsimile - Google Patents

Abstract

PURPOSE:To reduce the total number of lines, and to improve the using efficiency of the line by switching and connecting plural signal processing parts to the optional one of NCU parts or ISDN I/F parts connected to a PSTN line or an ISDN line. CONSTITUTION:When the response request of a G3 standard arises, a control part 2 sends a control signal to a switching part 10, and connects the NCU or the ISDN I/F having received call incoming to a non-operating G3 processing part, and executes call receiving operation. On the other hand, when the call incoming of the response request of a G4 standard arrives through the ISDN line, the receiving operation is executed by a G4 processing part connected directly to the ISDN I/F having received the call incoming. As mentioned above, since the operation of transmission and reception can be performed without any trouble if the number of the lines is made previously more or less the maximum number of the lines a device is estimated to transmit and receive at a time, the number of the lines can be greatly reduced compared with the total sum of a handset 11, the G3 processing parts 12a1 to 12an, and the G4 processing parts 13a1 to 13am.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a facsimile line switching device, and in particular, it is capable of connecting to multiple public networks (PSTN) or integrated services digital networks (ISDN), and can be used individually. The present invention relates to a facsimile line switching device that can perform multiple transmissions and receptions at the same time.

(Prior Art) Conventionally, there is a facsimile device that can be connected to a plurality of PSTNs or 15DNs and can simultaneously transmit and receive data from each of them. In order to fully utilize its functions, this facsimile machine has conventionally adopted the configuration shown in FIG. 4.

In the case of so-called memory transmission in which document information is temporarily stored in a storage device and then transmitted, the document information is first read from the scanner 1 and stored in the storage device 3 under the control of the control section 2 .

When the facsimile telephone number of the destination party is instructed from the panel 4, the control section 2 instructs the line control section 5 to make a call. The line control unit 5 is an inactive communication control unit (N CU').
Make a call using

Through protocol communication following the call, it is determined whether or not the destination facsimile device conforms to the G3 standard. Send the manuscript information stored in 3.

The G3 processing unit performs encoding processing suitable for the destination facsimile machine, modulates the signal, and sends the signal to the PSTN line via the NCU.

On the other hand, when making a call using the 15DN in response to the telephone number instruction, the line control section 5 enables the 15DN channel interface (ISDN1/F) and makes the call. When the line is connected, the control unit 2
The document information stored in the storage device 3 is sent to the G4 processing section corresponding to the G4 processing section. The G4 processing unit processes this document information and sends it to the I5DN line via the I5DN I/F.

As is well known, the I5DN has two B channels and one D channel as basic 1/F, and G4 communication is performed using the B channel. Therefore, l5
By providing one 15DN I/F for each DN line, two G4 communications can be performed at the same time.

In addition, please check whether the other party's facsimile device is 03 standard or G4
If the standard is known in advance, by specifying the standard from the panel 4, the line control section 5 makes a call using the device of the specified standard.

Contrary to the above, when a call arrives via the PSTN line or l5DN line, the incoming NCU or l5DNI/
Decoding of the image information received by the processing unit connected to F,
Performs processing such as demodulation. The processed image information is temporarily stored in the storage device 3, and then printed out as a hard copy from the printer 6.

This facsimile machine can perform multiple transmission and reception operations simultaneously.

(Problems to be Solved by the Invention) However, the facsimile apparatus has the following problems.

As is clear from FIG. 4, in the conventional facsimile machine, the G3 processing unit-NCU-PSTN line, the G4 processing unit-channel (ISDN I/F) ISDN line, and the handset-NCUPSTN line are fixed. In other words, it was common for each line to have a fixed communication processing unit.

Therefore, there are problems in that a large number of lines are required to connect to the facsimile machine and that the average usage rate of the lines is low. In particular, since the ISDN line can also perform G3 standard communication, there is a problem that wiring that allows only G4 standard communication is wasteful or large.

The purpose of the present invention is to eliminate the problems of the conventional device described above,
An object of the present invention is to provide a facsimile line switching device that can improve line usage efficiency.

(Means and effects for solving the problem) In order to achieve the above object, the present invention has a plurality of signal processing units and simultaneously performs a plurality of transmissions and receptions using a plurality of PSTN lines or ISDN lines. In the facsimile machine, the plurality of signal processing units are connected to the PSTN.
NCU unit or l connected to the line or l5DN line
The feature is that it can be connected to any 5D NI/F section by switching.

According to the present invention, even if the number of NCU sections or 15DN I/F sections connected to the PSTN line or 15DN line is smaller than the plurality of signal processing sections, the facsimile apparatus can be operated effectively.

As a result, the number of lines can be reduced, an inexpensive device can be provided, and the efficiency of line use can be improved.

(Example) The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a circuit diagram of a line switching device according to an embodiment of the present invention.

In this embodiment, the handset 11 and the 03 processing units 12a1-
12an is connected to one side of the switching unit 10, and the switching unit 1
On the other side of 0 are NCU14al~14ap and IS
DN I/F 15al to 15am are connected. As mentioned above, in reality, only one l5DN I/F is provided for every two channels, but in the following explanation, for convenience, one l5DN I/F is provided for each channel.
The explanation will be made assuming that 1/F is provided. Further, in the following explanation, the channel and the 15DN I/F are considered to be equivalent.

Each of the NCUs 14 al to 14 ap is connected to the PSTN line, and the I SDN I/F 15 al to 1
Each of the 5ams is connected to an 15DN line.

Here, p; Sn.

That is, the number of NCUIs 4al to 14ap is smaller than the number of G3 processing units 12a1 to 12an.

According to this embodiment, the G3 processing units 12a1 to 12an and the handset 11 can be connected to any of the NCUIs 4al to 14ap and I5DNI/Fs 15al to 15am.

For example, when a call is requested from the panel 4 to a facsimile machine of the 03 standard, the control unit 2 causes the inactive NCU or 15DN I/F to make the call via the line control unit 5. When the line is connected to the other party's facsimile machine, the control unit 2 sends a control signal to the switching unit 10 to connect the inactive G3 processing unit to the N CtJ or ISDN I/F.

After that, the control unit 2 reads the image information from the storage device 3, and
The data is sent to the G3 processing unit and subjected to known necessary data processing. The data-processed image information is sent to the NCU or 15DN1/F through the switching unit 10, and then sent to the PSTN
line or 15DN line.

Further, when there is a call request from the panel 4 to the 04 standard facsimile machine, the control unit 2 causes the inactive 15DN I/F to make the call via the line control unit 5. When the line is connected to the other party's facsimile machine, the control unit 2
Storage device 3 is installed in the G4 processing unit connected to the 5D NI/F.
Send image information from. The image information is subjected to well-known data processing in the G4 processing unit, and then sent to the l5DNI/F via the l5DN I/F.
It is sent to the 5DN line.

In the manner described above, it is possible to transmit to both G3 standard and G4 standard facsimile machines.

Contrary to the above, a case where a call is received via a PSTN line or an 15DN line will be explained.

When a G3 standard response request is received, the control unit 2 sends a control signal to the switching unit 10, connects the NCU or 15DN Natsu/F that received the call to the inactive G3 processing unit, and performs a receiving operation. . On the other hand, when there is an incoming call requesting a G4 standard response via the l5DN line, the l5D that received the call
The receiving operation is performed by the G4 processing unit directly connected to the NI/F.

As described above, according to this embodiment, if the number of lines connected to the facsimile machine is set to about the maximum number that the facsimile machine is expected to transmit and receive at the same time,
Since the transmission and reception operations can be carried out without any trouble, the number of lines can be reduced to the handset 11, G3 processing units 12al to 12an and G3 processing units 12al to 12an and
44 processes 13a1 to 13am.

FIG. 2 shows an example of a one-shot device of this embodiment. In this example, r
This uses 1-4 multiplexers 10aO to 10an such as analog S/W ICs such as 4052J.

According to this example, the handset 11 and the G3 processing unit 12a
l ~1.2an is NCU14a114a2, I5
DNI/F 15a1. , 15a2. Just one handset and n
Four channels (10 ISDN lines and 2 PSTN lines) can handle 2 G3 processing units and 2 64 processing units.

If 4 channels are not enough, replace the 1-4 multiplexer with a 1-r multiplexer (however,
r≧5).

Next, a second embodiment of the present invention will be described with reference to FIG. Note that FIG. 3 is a diagram showing only the characteristic parts of this embodiment, and the parts not shown are the same or equivalent to those in FIG. 1.

This embodiment is characterized in that a switching unit 20 is added to FIG. 1, and G44 processing units 13a1 to 13am are connected to one side of the switching unit 20, and ISDN I/Fs 15ai to 15aq are connected to the other side. be. Here it is 96m.

According to this embodiment, since the G4 processing section and the channels are connected via the switching section 20, the function can be effectively performed even if the number of I-S D N channels is less than the number of 64 processing sections. can be done.

Therefore, the number of PSTN lines and I5DN lines can be reduced compared to conventional ones, and the line usage rate can be improved.

(Effects of the Invention) As is clear from the above description, according to the present invention, the total number of lines connected to the facsimile machine can be reduced, and the number of channels of the NCU and 15DN connected thereto can be reduced. , and therefore has the effect of being economical.

Furthermore, the 15DN line can be shared by the 03 and G4 processing units, and the communication capability of the 15DN line can be fully utilized.

Furthermore, it is possible to improve the efficiency of line usage.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a circuit diagram showing a specific example thereof, Fig. 3 is a block diagram of the second embodiment, and Fig. 4 is a block diagram of a conventional device. .

Claims (1)

[Claims] (1) A facsimile line switching device having a plurality of signal processing units and capable of simultaneously transmitting and receiving a plurality of signals using a plurality of PSTN lines or ISDN lines, the facsimile line switching device comprising: The processing unit is
A facsimile machine characterized in that it is capable of being switched and connected to any NCU section or ISDN I/F section connected to a TN line or an ISDN line, and the total number of said lines is less than the number of said signal processing sections. Line switching device.