JP3546666B2 - Facsimile machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a facsimile machine, and more particularly, to a facsimile machine suitable for performing communication through a private branch exchange (PBX).
[0002]
[Prior art]
When facsimile communication is performed via a time division multiplexing (TDM) PBX, a bit mask of a low-speed (300 bps) NSF signal or DIS signal is performed when passing through a time division multiplexing device (TDM device). , NSF signal and DIS signal are invalidated. By this process, the communication capability is changed to the preset PBX capability, and the facsimile communication between the extensions via the PBX is ensured.
[0003]
[Problems to be solved by the invention]
When performing facsimile communication via the above-mentioned conventional PBX, the following problems occur. That is, in ITU-T, V.32 (standard for a two-wire full-duplex modem up to 9600 bps) is an extended function of V.32 as a standard for a two-wire full-duplex modem up to 28800 bps (33600 bps as an option). 34 have been recommended. Further, V.I. ITU-T Recommendation T.34 is a standard applied to communication procedures of facsimile machines. 30 ANNEXF has been defined.
[0004]
This T. In ANNEXF, after a call is made, a modified response tone (ANSam) is returned from the answering station to the calling station. After exchanging the calling menu (CM) from the calling station and the common menu (JM) from the answering station according to the procedure described in V.8. It is stipulated that the procedure shifts to 34 procedures.
[0005]
On the other hand, in a conventional TDM PBX in which the capability declaration of a 300 bps NSF signal or DIS signal is invalidated and the modulation method is changed in accordance with its own capability, V.V. Since the ANSam signal is not masked even if the ANSam signal is not compatible with the modulation method based on V.34 (V.34 modulation method), the ANSam signal passes through the PBX and is detected at the calling station. As a result, V.P. After 8 procedures, the TDM device becomes unsupported. Enter phase 34. However, in TDM, phases 2 and 3 for performing line probing, primary channel equalizer training, and the like do not pass, resulting in a communication error after all.
[0006]
The present invention solves the above-mentioned problems, and In a facsimile apparatus compatible with V.34, It is an object of the present invention to provide a facsimile apparatus which enables communication even through a PBX that does not support the FBX 34.
[0007]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and achieve the object, the present invention provides a call discriminating means for discriminating whether the call is an extension call or an outside call, and an ANSam signal or an initial identification signal received from a partner station. Based on the V. of the partner station. 8 capability identifying means for identifying the capability. 8 is determined to be available, and when it is determined that the call is an extension call by the calling determination means. 30 binary communication procedure. 8 and V.I. The first characteristic lies in that the communication procedure according to No. 34 is executed.
[0008]
Further, the present invention includes an incoming call discriminating means for discriminating whether the call is an extension incoming call or an outside call incoming call. 8 and V.I. 34 ability and T. The second feature lies in that communication is performed with 30 capabilities.
[0009]
Also, the present invention transmits a CED instead of an ANSam signal immediately after an incoming call, A third feature resides in that there is provided a capability declaration means for transmitting an initial identification signal including a declaration of eight capabilities.
[0010]
According to the first and second features, when the partner station is the V.40. V.8 in the case of an extension call or an extension call regardless of whether or not it has the V.8 capability. 8 abilities not used. Further, according to the third feature, V.V. Declaration of eight abilities is made.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 3 is an overall configuration diagram of a facsimile apparatus according to one embodiment of the present invention. The facsimile apparatus 100 shows a CPU 1 for controlling the entire facsimile apparatus 100, a RAM 2 as a work area used when executing a control program, a display and operation switches for operating the facsimile apparatus 100, and a processing result of the CPU 1. An operation display device 3 provided with a display screen and the like, a reading device 4 for reading a transmission original, a printing device 5 for printing and outputting received image information, etc., and performing image processing such as encoding / decoding / enlargement / reduction. An image processing device 6, an image storage device 7 for storing image information to be transmitted or received, a system control program storage unit 8 including a ROM storing a program for controlling the entire facsimile device 100, a digital network (for example, , A program for controlling communication (for example, G4) suitable for an ISDN network) Digital communication control program storage unit 9 composed of a ROM, analog communication control program storage unit 10 composed of a ROM storing a program for controlling communication suitable for an analog network (for example, G3), and facsimile machine 100 A digital network controller 11 for connecting the facsimile apparatus 100 to an analog network, and a plurality of external line interfaces and a plurality of internal communication circuits by switching. And a line switching control unit 15 for connecting them to each other by a system bus 14.
[0012]
The digital communication control program storage unit 9 is directly connected to the line switching control unit 15 and the analog communication control program storage unit 10 is connected to a line via a modem (modulator / demodulator) 12 having a low-speed mode and a high-speed mode. The switching control device 15 is interconnected. The line switching control device 15 is mutually connected to each of the digital network control device 11 and the analog network control device 13. Further, the analog communication control program storage unit 10 and the analog network control device 13 are mutually connected.
[0013]
The facsimile apparatus 100 of the present embodiment can be connected to a digital network or an analog network, but when the facsimile apparatus 100 is connected only to an analog network, the digital communication control program storage unit 9 and the digital network control unit 11 When only the digital network is connected, the analog communication control program storage unit 10, the modem 12, and the analog network controller 13 can be omitted.
[0014]
Next, ITU-T Recommendation T. An outline of a basic communication procedure of 30 ANNEXF will be described. FIG. 30 shows a basic communication procedure of ANNEXF, that is, a procedure at the start of communication, a procedure at the time of transmitting image information, and a procedure at the end of communication. The signal transmitted from the calling station to the called station is shown on the left side of the center line, and the signal transmitted from the called station to the calling station is shown on the right side of the center line in chronological order from the top. Have been.
[0015]
The procedure at the start of communication includes network interaction (phase 1) for recognizing the functions and the like of the partner terminal, and line probing (line probing for grasping the state of the communication line set between the calling station and the answering station). Phase 2), primary channel equalizer training for training the equalizer built in the modem 12 (phase 3), exchange of performance information of the modem 12, etc., setting of the data signal speed, etc. T. Modem parameter exchange (phase 4), exchange of control channel data prior to transmission of image information, etc. Each phase includes 30 facsimile handshakes (phase 5) and primary channel resynchronization (phase 6) for resynchronizing the primary channel prior to image information transmission. In the network interaction, 8 are performed. The calling station detects the ANSam signal transmitted by the called station, and the called station transmits the ANSam signal. When it recognizes that it has the V.34 capability, it starts transmitting the CM signal and Perform 8 steps. After line probing, V.V. The operation according to No. 34 is performed.
[0016]
If the calling station fails to receive the ANSam signal immediately after connection, the communication procedure of FIG. 5 is taken. In FIG. 5, if the calling station fails to receive the ANSam signal, and consequently the called station fails to receive the CM signal within a predetermined ANSam transmission time (5 seconds ± 1 second), the called station After stopping the ANSam signal, the station transmits DIS / NSF / (TSI) at 300 bps. This DIS signal causes V.V. 8 capability (= V.34 capability) is declared. The calling station is V. If a DIS signal indicating that the terminal has the capability 8 is received, transmission of a call indication (CI) is started. Upon receiving the CI signal, the called station retransmits the ANSam signal. At the time of detecting the ANSam signal, the calling station sets the V.A. 8 procedure. Attempt to initiate communication by.
[0017]
The calling station cannot detect the ANSam signal, and the DIS signal also V.8 capability is not set, or the called station does not receive a CM signal or a CI signal. Procedure 8 is not started.
[0018]
In the present embodiment, V.V. It realizes a communication procedure that can support extension communication via a PBX that does not support the PBX 34. For example, V.V. V.34 via a PBX that does not support V.34. No communication is possible in V.34, but V.34 in external line communication. Assume a configuration in which 34 communication is possible.
[0019]
First, a first embodiment will be described. FIG. 6 is a diagram illustrating a communication system including the facsimile apparatus according to the first embodiment. In the figure, the facsimile apparatus 16 has an extension port PO1 and an outside port PO2. The extension port PO1 is connected to a facsimile machine 19 via an extension (for example, a company dedicated line) including PBXs 17 and 18 of the TDM system. Here, the facsimile apparatuses 16 and 19 are V. Extensions including PBXs 17 and 18 have V.34 capabilities. 34 is not supported. On the other hand, the outside line port PO2 is V.34 through an external line, that is, a general public line corresponding to V.34. 34 is connected to the facsimile machine 20 corresponding to the F.34. In the first embodiment, it is assumed that the facsimile machine 16 is a calling station and the facsimile machines 19 and 20 are called stations.
[0020]
In the first embodiment, when an extension is called, even if an ANSam signal is received from the called station, it does not respond. In other words, V.V. that can respond to the extension capability without transmitting a CM signal. 17 and V. Communication is started by a modulation method such as 29. Further, since the calling station cannot detect the ANSam signal immediately after the connection, the called station uses the DIS signal as the initial discrimination signal to output the ANSam signal. Even if it declares that it has eight capabilities, it does not respond and does not transmit the CI signal. On the other hand, when an outgoing call is made, the V.A.M. Communication is performed using the 34 modulation method. The extension port PO1 and the extension line PO2 are switched by a changeover switch or a trigger such as a transmission number (for example, the outside line has 0 calls and the extension has 7 calls). Can be performed.
[0021]
The operation of the facsimile machine 16 in the first embodiment will be described with reference to a flowchart. In the flowcharts described below, descriptions of timer processing, signal retransmission, and the like that are not directly related to the main part of the present invention are omitted. In FIG. 7, in step S1, it is determined whether or not the ANSam signal has been received. If the ANSam signal has been received, the process proceeds to step S2. In step S2, it is determined whether the call is an extension call based on the trigger. If the call is an extension call, the process proceeds to step S5, and communication is performed according to the normal procedure (ITU-T Recommendation T.30). If the call is not an extension call, the process proceeds to step S3 to start transmitting a CM signal. In the following step S4, V.V. 8 procedure. Communication is performed in 34 steps.
[0022]
If the ANSam signal is not detected in the determination in step S1 and the DIS signal is detected in step S6 after a predetermined ANSam signal transmission time has elapsed, the process proceeds to step S7, where the DIS signal is analyzed and 8. Determine the ability. V.DIS signal causes If not, the process proceeds to step S5. V.DIS signal causes If the 8 capability declaration has been made, the process proceeds to step S8, and similarly to step S2, it is determined whether or not an extension call has been made. If the call is an extension call, the process proceeds to step S5, and communication is performed according to the normal procedure (ITU-T Recommendation T.30). If the call is not an extension call, the flow advances to step S9 to start sending a CI signal. After starting the transmission of the CI signal, the process proceeds to step S1, and the operation for detecting the ANSam signal is started again.
[0023]
The function of the main part for performing the operation of the first embodiment is shown in the functional block of FIG. In the figure, a first communication unit 22 is based on ITU-T Recommendation V. 8 and V.I. 34, and has a capability to execute a communication procedure according to ITU-T Recommendation T.34. It has the ability to perform 30 binary communication procedures. The call determining unit 24 determines whether the call is an internal call or an external call based on a trigger for separating the extension port PO1 and the external port PO2. If the trigger is on, "0" is output as information indicating that the call is an extension, and if the trigger is off, "1" is output as information indicating that the call is an outside call.
[0024]
The capability judging unit 25 determines the V.V. of the partner station, that is, the called station, based on the capability declaration of the ANSam signal or DIS signal. 8 Identify the ability. That is, V. If it is determined that there is an ability, "1" is output as information indicating the ability, and If it is determined that there is no capability, "0" is output as information of no capability.
[0025]
The selection unit 26 selects the first communication unit 22 or the second communication unit 23 based on the determination signals from the call determination unit 24 and the capability determination unit 25. For example, if the selecting unit 26 has a function equivalent to an AND circuit, it is an extension call, and the other station has the V.25 function. 8 capability, the output is "0", the call is an extension call, and If there are no eight capabilities, the output will also be "0". On the other hand, when the call is an outside line and the partner station is V. If it has 8 capabilities, the output is "1", the call is an outside line, and If there are no eight capabilities, the output is "0".
[0026]
The first communication unit 22 is set to be activated by information "1" from the selection unit 26, and the second communication unit 23 is set to be activated by information "0" from the selection unit 26. Thus, the second communication unit 23 is always enabled when an extension is called, and when the outside line is called, the V.V. The first communication unit 22 and the second communication unit 23 are enabled depending on the presence or absence of the eight capabilities.
[0027]
Next, a second embodiment will be described. In the second embodiment, in the system shown in FIG. 6, it is assumed that the facsimile machines 19 and 20 are calling stations and the facsimile machine 16 is a called station, contrary to the first embodiment. That is, in the second embodiment, when the extension is called, the V.V. Disable 34 abilities.
[0028]
FIG. 8 is a flowchart showing the operation of the called station facsimile apparatus 16 in the second embodiment. In step S11, it is determined whether the call is an extension call. This determination can be made based on which of the ports PO1 and PO2 has arrived. If the call is an extension call, the flow shifts to step S12 to transmit the called station identification (CED). In step S13, DIS / (NSF) / (TSI) is transmitted. DIS signal includes V. 8 Declaration without ability is described. In step S14, communication is performed according to the normal signal procedure (ITU-T Recommendation T.30).
[0029]
If the call is not an extension call, transmission of the ANSam signal is started in step S15. In step S16, it is determined whether a CM signal has been received. If the CM signal has been received, the process proceeds to step S17 to stop sending the ANSam signal. In step S18, V.V. 8 procedure. Communication is performed in 34 steps.
[0030]
If the CM signal is not detected after the elapse of the predetermined delay time (5 seconds ± 1 second) in step S19, the process proceeds to step S20 to stop transmitting the ANSam signal. Then, in step S21, DIS / (NSF) / (TSI) is transmitted as in step S13. In step S22, it is determined whether or not a response has been received. If the response is a digital command (DCS) or NSS of 300 bps, the process proceeds to step S14. Then, the process proceeds to step S15, and the transmission of the ANSam signal is started again.
[0031]
FIG. 2 is a functional block diagram showing a main part function for performing the operation of the second embodiment, and the same reference numerals as those in FIG. 1 indicate the same or equivalent parts. The input port 27 has independent ports for incoming calls for each of internal and external calls. Therefore, the incoming call determination unit 28 determines which of the input ports 27 has received the call, and determines whether the call is an external call or an internal call. When information indicating an extension incoming call is input from the incoming call discriminating unit 28, the selecting unit 29 disables the first communication unit 22 and performs communication using the second communication unit 23. On the other hand, when the information indicating the incoming call to the outside line is input, the first communication unit 22 is enabled. That is, V.I. Communication is performed using eight methods.
[0032]
Next, a third embodiment will be described. In the above-described first and second embodiments, the facsimile apparatus 16 has independent ports for the extension and the outside line. However, in a facsimile apparatus that does not necessarily have such independent ports, the facsimile apparatus 16 will be described below. Three embodiments can be applied. As described above, the declaration of the modulation method not corresponding to the PBXs 17 and 18 is masked (converted to 0) between the PBXs 17 and 18. Therefore, in the third embodiment, a CED signal is transmitted instead of the ANSam signal scheduled immediately after the incoming call, and then the V.30 signal is transmitted. 8. A 300 bps DIS signal declaring the capability is transmitted.
[0033]
FIG. 9 is a flowchart showing the operation of the called station in the third embodiment. In FIG. 9, in step S31, a CED signal is transmitted. In step S32, DIS / (NSF) / (TSI) is transmitted. DIS signal includes V. 8 Declaration without ability is described. In step S33, it is determined whether or not a response has been received. If the response is a digital command (DCS) or NSS of 300 bps, the process proceeds to step S34, and communication is performed in a normal procedure (ITU-T Recommendation T.30). If the response is a CI signal, the calling station is in the V.30 state. Then, the process proceeds to step S35, and transmission of the ANSam signal is started.
[0034]
In step S36, it is determined whether a CM signal has been received. If the CM signal has been received, the process proceeds to step S37 to stop sending the ANSam signal. In step S38, V.V. 8 procedure. Communication is performed in 34 steps. If the CM signal is not detected after the elapse of the predetermined delay time (5 seconds ± 1 second) in step S39, the process proceeds to step S40, where the transmission of the ANSam signal is stopped, the process proceeds to step S32, and DIS / ( NSF) / (TSI). If it is determined in step S33 that no response has been received, the process proceeds to step S32.
[0035]
FIG. 10 shows an example of a signal transmitted from the called station and an example of conversion in the PBX in the third embodiment. In the figure, the NSF (000001924C0 ...) and the DIS (20EE) transmitted by the facsimile apparatus 16 which is the called station are masked when passing through the extension PBXs 17 and 18, and are respectively NSF (000000000 ...) and DIS (00EE). Changes to Therefore, the facsimile machine 19 of the calling station has the F.V. 8 because it recognizes that it does not have the ability. At 34, no communication is attempted. Therefore, communication can be continued without causing an error.
[0036]
On the other hand, when the NSF (000001924C0 ...) and the DIS (20EE) transmitted by the facsimile apparatus 16 as the called station are transmitted to the outside line via the PBX 21, the signals are not converted because they do not pass between the PBXs. The facsimile apparatus 20 which is the calling station arrives, and the facsimile apparatus 20 receives the call from the V.200. You can recognize that you have 8 abilities. Therefore, the V.F. The communication at 34 becomes possible.
[0037]
【The invention's effect】
As is clear from the above description, according to the present invention, when the partner station is the V.30. V.8 in the case of an extension call or an extension call regardless of whether or not it has the V.8 capability. 8 abilities not used. Therefore, V. When the connection is made to an extension including a PBX of the TDM system which does not support the T.34, a communication error due to the ANSam signal can be prevented.
[0038]
In addition, a CED signal is transmitted instead of the ANSam signal immediately after the call is received, and the V.D. 8 is declared. When connected to an extension including a PBX of the TDM system not supporting the V.34. 8 capability declaration is masked and V.V. 8 capability declaration is transmitted to the other station, and the desired V.8 is declared. Communication can be performed by 34 modulation methods.
[Brief description of the drawings]
FIG. 1 is a block diagram (part 1) illustrating main functions of a facsimile apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram (part 2) illustrating main functions of the facsimile apparatus according to the embodiment of the present invention;
FIG. 3 is a diagram illustrating an overall configuration of a facsimile apparatus according to an embodiment of the present invention.
FIG. It is a sequence diagram which shows the basic communication procedure of 30 ANNEXF.
FIG. 5 is a diagram showing a T.A. signal when an ANSam signal immediately after connection is not received. It is a sequence diagram which shows the basic communication procedure of 30 ANNEXF.
FIG. 6 is a diagram illustrating a communication system including the facsimile apparatus according to the first embodiment.
FIG. 7 is a flowchart showing an operation of the calling station according to the first embodiment.
FIG. 8 is a flowchart illustrating an operation of a called station according to the second embodiment.
FIG. 9 is a flowchart illustrating an operation of a called station according to the third embodiment.
FIG. 10 is a diagram illustrating a communication system including a facsimile apparatus according to a third embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... CPU, 8 ... System control program storage part, 12 ... Modem, 22 ... First communication part, 23 ... Second communication part, 24 ... Calling judgment part, 25 ... Capability judgment part, 26 ... Selection part, 28 ... Call discrimination unit

Claims (4)

ITU-T Recommendation V. 8 and V.I. A first communication means for executing a communication procedure according to 34;
ITU-T Recommendation T. A second communication means for performing a 30 binary communication procedure;
Call determining means for determining whether the call is an internal call or an external call,
Based on the ANSam signal or the initial identification signal received from the partner station, the V.A. 8 ability discriminating means for identifying 8 ability;
The V.V. Selecting means for selecting the second communication means when it is determined that the apparatus has 8 capabilities and the calling determination means determines that the call is an extension; and selecting the first communication means when it is determined that the call is an external call. A facsimile machine comprising: ITU-T Recommendation V. 8 and V.I. A first communication means for executing a communication procedure according to 34;
ITU-T Recommendation T. A second communication means for performing a 30 binary communication procedure;
Incoming call discriminating means for discriminating whether the call is an internal call or an external call,
A facsimile apparatus comprising: a selection unit for invalidating the first communication unit and performing communication by the second communication unit when the determination unit determines that the call is an extension incoming call. ITU-T Recommendation V. 8 and V.I. A first communication means for executing a communication procedure according to 34;
ITU-T Recommendation T. A second communication means for performing a 30 binary communication procedure;
A CED signal is transmitted instead of the ANSam signal immediately after the call is received. 8. A facsimile apparatus comprising: capability declaration means for transmitting an initial identification signal including a declaration of capability. ITU-T Recommendation V. 8 and V.I. The facsimile apparatus according to any one of claims 1 to 3, wherein the facsimile apparatus is connected to an extension via a self-division multiplexing private branch exchange that does not support the F.34.

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