JP2580968B2 - ISDN subscriber equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to an ISDN (Integrated Services Digital Network) subscriber equipment ISDN terminal. In particular, the present invention relates to contention adjustment when a plurality of ISDN terminals, for example, a facsimile, etc., connected to one network terminating device in a bus form respond to a call setup message from a network.

[0002]

2. Description of the Related Art FIG. 9 is a sequence diagram showing an incoming procedure of an ISDN terminal of an ISDN subscriber device.

[0003] Conventionally, ISDN subscriber equipment is provided with one ISDN subscriber.
In this configuration, a plurality of ISDN terminal devices are connected to a network terminating device of the DN in a bus format via an ISDN bus cable. In this case, when each terminal receives the call setup "SETUP" message from the network side, it checks whether a sub-address is added to this call setup message, and if the sub-address is added, only the specified terminal Set up a call. If the subaddress is not added, the response “CO” is first among a plurality of terminals connected on the ISDN bus cable.
The terminal that has sent the "NN" message has the right to receive it. That is, it is negotiated to establish a call with the network. Referring to FIG. 9, after transmitting the call setup "SETUP" message, the network
Since the response “CONN” message from the SDN terminal 24 has been received, the response confirmation “C
"ONN ACK" message, and the ISDN terminal 2
3 and the ISDN terminal 25 transmit a release "REL" message. ISDN terminal 23 and ISDN terminal 2
5 transmits a release complete “REL COMP” message in response to the request. Then ISD by B channel
Communication with the N terminal 24 is performed. The ISDN terminal is designed to transmit a response "CONN" message as soon as possible if a call setup with the network is possible upon detecting the call setup message.

When the terminal connected to the ISDN line is a facsimile machine, the terminal comprises an operation section, a document reading section, a recording section, a central control section, a codec section, an image storage section and a communication control section. As described in JP-A-3-92036, when an ISDN terminal (for example, a facsimile machine) detects a call setup message, a signal received from the network can be accepted at that point in time, but after reception, a future reception There is an ISDN terminal having a delay unit that delays the transmission of a response message by a predetermined time when it is determined that a priority situation may occur. This is because reception is preferentially made to a terminal with a large receiving capacity, based on the receiving capacity of the terminal, such as the memory capacity at the time of incoming call, the remaining amount of recording paper, the remaining time until the specified time of time specification communication, etc. It is an object of the present invention to reduce the possibility of a failure such as insufficient reception of memory capacity or recording paper, or termination of reception even at a designated time of designated time communication.

[0005]

However, in such a conventional ISDN subscriber device, call setting is made by the response speed of the ISDN terminal or the receiving capability of the terminal as in the terminal described in Japanese Patent Application Laid-Open No. 3-92036. If so, in some cases, inconvenience may occur. That is, since the receiving amount is larger than the processing amount of the receiving side operator such as the processing of the received recording paper, the replacement of the toner and the ink ribbon, and the processing of the information received in the memory, the receiving side terminal and the operator are In order to improve the reception processing ability by increasing the number of receptions, spatially dispersed reception is necessary due to various conditions such as the location of the terminal and the location of the operator,
In the above-described method, there is a disadvantage that distributed reception cannot be performed because a call is set with a capability unique to a terminal.

[0006] The present invention solves the above-mentioned drawback, and the time required for each ISDN terminal to transmit a response message when a call setup message is received can be dispersed, and the reception processing can be spatially distributed. It is intended to provide an ISDN subscriber device.

[0007]

Means for Solving the Problems The first invention is an ISDN.
A network termination device for the line, and a plurality of ISDN terminals connected to the network termination device via a bus;
A communication control unit for performing communication control,
A central control unit for performing control within the own terminal, the central control unit comprising: a call setting detecting unit for detecting a call setting message from the communication control unit; and a sub-address in the call setting message from the call setting detecting unit. Sub-address detecting means for detecting whether the address is added and detecting whether the address matches the address of the own terminal when the address is added, and a response to the call setup message activated when the detection result of the sub-address detecting means matches. In the ISDN subscriber apparatus including a response unit for transmitting a message via the communication control unit, the central control unit generates a random number at the time of activation, times out in a time corresponding to the random number, and activates the response unit. A timer and a predetermined response waiting state when the detection result of the sub-address detecting means indicates that no sub-address is added. Response wait judging means for judging whether or not there is a response wait based on information, wherein the response wait judging means starts the timer when the judgment result indicates that there is a response wait; In the case of (1), means for activating the response means is included.

According to a second aspect of the present invention, in the ISDN subscriber device according to the first aspect, the central control unit includes a device number storage unit that stores a unique device number of the terminal itself, and a clock unit that outputs time information. When the result of the determination by the response wait determining means indicates that there is a response wait, a number corresponding to the time information output by the clock means is obtained, and the obtained number matches the stored unique device number of the own terminal. Device number determining means for determining whether the timer is started when the result of the determination is inconsistent, and means for activating the response means when the result of the determination is a match. Wherein the response waiting determination means includes means for activating the response means when the result of the determination is that there is no response waiting.

Further, according to the present invention, the apparatus number judging means includes a time number correspondence table storing a number corresponding to a minute of time and a time number correspondence table based on time information output from the clock means. And a means for comparing the extracted number with the unique device number of the own terminal.

Further, according to the present invention, the device number storage means includes an area for storing the number of the plurality of ISDN terminals, and each of the plurality of ISDN terminals stores the number of the devices and a unique device number of its own terminal. A switch for setting the number in the device number storage means, wherein the device number determination means obtains a remainder obtained by dividing the number of seconds of the time information output by the clock means by the stored number of devices. Means for comparing the surplus with the unique device number of the own terminal.

According to a third aspect of the present invention, there is provided a network terminator for an ISDN line, and a plurality of I / Os connected to the network terminator via a bus.
An SDN terminal, wherein each of the plurality of ISDN terminals has a communication control unit for performing communication control, a central control unit for performing control within the terminal, a recording unit for recording a received document, and a recording unit for recording the received document. A central stacking unit for detecting a call setting message from the communication control unit; and a sub-address in the call setting message from the call setting detecting unit. Sub-address detecting means for detecting whether the address is added and detecting whether the address matches the address of the own terminal when the address is added, and a response to the call setup message activated when the detection result of the sub-address detecting means matches. A response means for transmitting a message via the communication control means, the central control unit comprising: A timer for activating the response unit after time-out occurs, and a response wait determining unit for determining whether there is a response wait based on preset response wait presence / absence information when the detection result of the sub-address detection unit does not add a sub-address. The document stacker includes monitoring means for monitoring the recording paper on the document stacker; and the central control unit detects a remaining amount of recording paper based on a monitoring result of the monitoring means. Wherein the remaining amount detecting means sets a time corresponding to the detected remaining amount of the recording paper in the timer when the result of the response waiting determining means indicates that there is a response waiting, and starts the remaining amount detecting means. Means for activating the response means if the result of the determination is that there is no response wait.

[0012]

When a call setup message is detected and a subaddress is not added to the message and a response waiting is set, a timer that times out by a random number time is started, and a response is made when the timer times out. Since the message is transmitted, the time until each ISDN terminal transmits the response message when the call setup message is received can be dispersed, and the reception processing can be spatially dispersed.

Here, when a call setup message is detected, a subaddress is added to the message to match the address of the terminal itself, or when a subaddress is not added and the message is set without waiting for a response, Send a response message to.

When the response waiting is set, the response message is transmitted immediately when the number obtained from the time information matches the address of the terminal itself, and when the number does not match, the timeout is performed with the above-mentioned random number time. By starting the timer and transmitting the response message when the timer times out, the receiving process can be spatially distributed. In addition, when a recording unit and a document stacker are provided, the remaining amount of recording paper on the document stacker is detected, a timer is set to a time corresponding to the remaining amount, the timer is activated, and a response message is transmitted when a timeout occurs. Thereby, the receiving process can be spatially distributed.

[0015]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an ISDN subscriber apparatus according to a first embodiment of the present invention. FIG. 2 shows a first embodiment I of the present invention.
FIG. 2 is a block diagram of an ISDN terminal of the SDN subscriber device, and shows a block diagram of a G4 facsimile. In FIGS. 1 and 2, the ISDN subscriber device includes a network termination device 21 of the ISDN line 22 and a bus 26 connected to the network termination device 21.
A plurality of ISDN terminals 23 to 25 connected via a bus 26. Each of the plurality of ISDN terminals 23 to 25 is connected to the bus 26 as communication control means for performing communication control, and the interface 10 and the communication control unit 9; , R
A central control unit 6A composed of an OM, a RAM and the like for controlling the inside of the terminal, a control signal line 1 for connecting each unit, an image data line 2 for transmitting and receiving image data, a switch and a liquid crystal display. An operation unit, a document reading unit 4 for reading a document, an image storage unit 7 composed of a DRAM or a hard disk, and a codec unit 8 for encoding and decoding image data.
Setting detection means 61 for detecting a call setting message from
A sub-address detecting means 62 for detecting whether a sub-address is added to the call setting message from the call setting detecting means 61 and detecting whether or not the address matches the address of the own terminal when the sub-address is added; A response unit 66 that is activated when the detection results match and transmits a response message to the call setting message via the communication control unit 9; and a terminal attribute of a parameter of the call setting message detected by the call setting detection unit 61. And a release means for transmitting a release completion "REL COMP" when is not a G4 facsimile.

Here, a feature of the present invention is that the central control unit 6A generates a random number at the time of activation, times out in a time corresponding to the random number, activates the response means 66, and the sub-address detection means 62 Response wait determining means 63 for determining whether or not there is a response wait based on the response wait presence / absence information set in advance when the detection result indicates that the sub address is not added. In this case, there is provided a means for activating the timer 64 and a means for activating the response means 66 when the result of the determination is that there is no response waiting.

The operation of the ISDN subscriber device having such a configuration will be described.

FIG. 3 is a flow chart showing the procedure for terminating an ISDN subscriber device with an ISDN terminal network according to the first embodiment of the present invention. In FIG. 1 to FIG. 3, the incoming call processing of the control procedure executed by the central control unit 6A will be described.
When a call is received, the call setting "SETUP" message is received by the call setting detecting means 61 from the network side, so that the call receiving process is started (S31). Next, it is determined whether the terminal attribute of the parameter of the “SETUP” message is G4 facsimile (S32). If it is not the G4 facsimile, the release means 65 rejects the incoming call by transmitting a release completion "REL COMP" message (S33). G
If it is 4 facsimile (S32), the sub-address detecting means 62 determines whether or not the parameter of the "SETUP" message has a sub-address (S34). If a subaddress is added, it is the ISDN
It is determined whether or not it matches the sub-address assigned to the terminal (S35). If they match, the response means 66 transmits a response "CONN" message (S3).
6), an incoming call operation is performed (S37).

If they do not match, the release means 65 rejects the incoming call by transmitting a release complete "REL COMP" message (S33). If it is determined in step S34 that the sub address has not been added,
The response wait determining means 63 determines whether or not a response wait state exists (S38). If you do not want to wait for a response,
The response means 66 transmits a response "CONN" message (36), and performs an incoming call operation (S37). If there is a response wait, a uniform random number from “0” to “31” is set to 10
The timer 13 in which a value multiplied by msec is set is started (S39), and when the timer times out (S40),
The response unit 66 is activated, a response "CONN" message is transmitted (S36), and an incoming call operation is performed (S37). Here, as shown in FIG. 9, the receiving operation of step S37 includes a case where a response confirmation "CONN ACK" message is received from the network, a case where a release "REL" message is received, and a disconnection "DISC" message. Abnormal procedures such as reception and timeout are also included, but since this is an operation according to ISDN terminal regulations, the description is omitted. Step S3
At 7, the incoming call operation ends, and the incoming call process ends.

As described above, in this embodiment, a plurality of terminals can stably distribute reception. Also, by adding weights to the random numbers for each terminal, the variance can be adjusted for each terminal according to the operation mode of the terminal.

FIG. 4 is a block diagram of an ISDN terminal device of an ISDN subscriber device according to a second embodiment of the present invention. FIG. 5 is a diagram showing the contents of the device number storage means and the time number correspondence table of the ISDN terminal device of the second embodiment of the present invention, and FIG. 5 (a) shows the contents of the device number storage means. FIG. 5B shows the contents of the time number correspondence table. FIG. 6 shows a second embodiment of the ISDN subscriber unit according to the present invention.
It is a flowchart which shows the receiving procedure of an SDN terminal device. A second embodiment will be described with reference to FIGS. In FIG. 4, reference numeral 67 denotes a device number storage means for storing a unique device number (and the number of devices) of its own terminal.
Reference numeral 15 denotes a switch for externally setting the number of terminals connected to the bus 26 and the device number in the device number storage means 67. The switch 15 comprises 6 bits of dip switches. Can be set from "0" to "7". Reference numeral 68 denotes clock means, and reference numeral 69 denotes device number determination means. As described later, in this embodiment,
When extracting the number corresponding to the device number from the time,
The calculation is performed by using the number of connected DN terminals. The device number determining means 69 has a time number correspondence table in the RAM, which pairs the value of the time and the number shown in FIG. There is a method of obtaining a number.

In FIG. 6, if there is a response waiting in S38, the device number judging means 69 inputs the current time from the clock means 66, and the number of connected terminals and the device number from the contents of the device number storing means 67. Is input (S41).
Next, a remainder obtained by dividing the number of seconds of the time by the number of connected terminals is determined, and it is determined whether or not the remainder matches the device number (S42, S43). If they match, the response means 66 immediately transmits a response "CONN" message (S36). If they do not match, after step 39, the timer 64 which times out in a time corresponding to the random number is activated in the same manner as shown in FIG. 3, and the transmission of the response "CONN" message is delayed until the time-out.

As described above, according to the present embodiment, it is possible to decentralize the receiving process corresponding to the time. In the present embodiment, the receiving terminal is determined in seconds, so that the operation has the same effect of decentralization as in the first embodiment, but, for example, the rest time of the operator is divided for each terminal. In the operation mode, it is set so that the receiving terminal is determined in units of time, and the receiving terminal handled by the operator taking a break can be treated as an auxiliary receiving terminal when other terminals are communicating or preparing to receive. It is possible to change the distribution of the reception processing over time.

FIG. 7 is a block diagram of an ISDN terminal device of an ISDN subscriber device according to a third embodiment of the present invention. FIG. 8 is a flowchart showing an incoming procedure of the ISDN terminal device of the third embodiment of the present invention. A third embodiment will be described with reference to FIGS. In FIG. 7, reference numeral 5 denotes a recording unit for recording received originals, 11 denotes a document stacker for discharging and accumulating the paper recorded by the recording unit 5, 12 denotes a recording paper detection sensor, 70 denotes a remaining amount detection unit, and 71 denotes a remaining amount detection unit. The response means 66 times out at the set time.
Indicates a timer that activates The remaining amount detecting means 70 has a counter in the RAM as a method for detecting the amount of recording paper on the original stacker 11, and constantly monitors the recording paper detection sensor 12 and sets the counter to "0" if there is no recording paper. When recording is performed, the counter is incremented by one each time one sheet of recording paper is output, and the value of this counter is used as the remaining amount of recording paper. In this method, it is generally assumed that the operator removes all the recording paper of the original stacker 11. If not, the counter value may be incorrect and the counter value may be incorrect. It is adopted because it does not significantly affect the decentralization of the operation purpose and can be realized with simple hardware. In addition, a method of detecting the remaining amount of the recording paper by detecting the weight of the recording paper can be easily considered.

In FIG. 7 and FIG. 8, step S38
When there is a response waiting, the remaining amount detecting means 70 detects the remaining amount of the recording paper on the original stacker 11 and adds 10 to the count value.
The value multiplied by msec is set in the timer 71 and activated,
The response means 66 responds “CONN” until a timeout occurs.
Delay sending the message.

As described above, according to the present embodiment, the amount of recording paper on the document stacker can be dispersed even if there is a difference in reception processing between terminals.

[0028]

As described above, according to the present invention, when the call setup message is received, the time until each ISDN terminal transmits the response message can be dispersed, and the reception processing can be spatially dispersed. .

[Brief description of the drawings]

FIG. 1 is a block diagram of an ISDN subscriber device according to a first embodiment of the present invention.

FIG. 2 is an ISD of an ISDN subscriber device according to a first embodiment of the present invention;
FIG. 3 is a block diagram of an N terminal.

FIG. 3 is an ISD of an ISDN subscriber device according to a first embodiment of the present invention;
9 is a flowchart illustrating an incoming process of an N terminal.

FIG. 4 is a second embodiment of the present invention.
FIG. 3 is a block diagram of an N terminal.

FIG. 5 is a second embodiment of the present invention;
The figure which shows the content of the apparatus number storage means and time number correspondence table of N terminal device.

FIG. 6 is an ISD of an ISDN subscriber device according to a second embodiment of the present invention;
9 is a flowchart illustrating an incoming process of an N terminal.

FIG. 7 is a third embodiment of the present invention;
FIG. 3 is a block diagram of an N terminal.

FIG. 8 is a third embodiment of the present invention;
9 is a flowchart illustrating an incoming process of an N terminal.

FIG. 9 is a sequence diagram showing an incoming call processing of the ISDN terminal of the ISDN subscriber device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control signal line 2 Image data line 3 Operation part 4 Document reading part 5 Recording part 6A, 6B, 6C Central control part 7 Image storage part 8 Codec part 9 Communication control part 10 Interface 11 Document stacker 12 Recording paper detection sensor 15 Switch 21 Network terminating equipment (NT) 22 ISDN line 23-25 ISDN terminal 26 Bus 61 Call setting detecting means 62 Sub address detecting means 63 Response waiting judging means 64, 71 Timer 65 Release means 66 Responding means 67 Device number storage means 68 Clock means 69 Equipment Number judgment means 70 Remaining amount detection means

Claims (5)

(57) [Claims] 1. A network termination device for an ISDN line, and a plurality of ISDN terminals connected to the network termination device via a bus, wherein each of the plurality of ISDN terminals performs communication control, A central control unit that performs control in the terminal itself; the central control unit includes a call setting detection unit that detects a call setting message from the communication control unit; and a sub-address in the call setting message from the call setting detecting unit. Sub-address detecting means for detecting whether the address is added and detecting whether the address matches the address of the own terminal when the address is added, and a response to the call setup message activated when the detection result of the sub-address detecting means matches. Response means for transmitting a message via the communication control means.
In the DN subscriber unit, the central control unit generates a random number at the time of activation, times out in a time corresponding to the random number, activates the response unit, and a timer when the detection result of the sub address detection unit indicates that the sub address is not added. Response wait determining means for determining whether or not there is a response wait based on preset response wait presence / absence information, wherein the response wait determination means starts the timer when the determination result indicates that there is a response wait. Means for activating the responding means if the result of the determination is that there is no response waiting. 2. The ISDN subscriber unit according to claim 1, wherein the central control unit stores a device number unique to the terminal itself, a clock unit that outputs time information,
When the result of the determination by the response wait determining means indicates that there is a response wait, a number corresponding to the time information output by the clock means is obtained, and the obtained number matches the stored unique device number of the own terminal. Device number determining means for determining whether the timer is activated when the determination result is inconsistent, and means for activating the response means when the determination result is inconsistent. An ISDN subscriber device, wherein the response waiting determination means includes means for activating the response means when the result of the determination is that there is no response waiting. 3. The device number judging means extracts a corresponding number from the contents of the time number correspondence table based on time information output by the clock means, and a time number correspondence table storing numbers corresponding to time. 3. The ISDN subscriber apparatus according to claim 2, further comprising: means for comparing the extracted number with a unique apparatus number of the terminal. 4. The apparatus according to claim 1, wherein the device number storage unit stores the plurality of I
An area for storing the number of SDN terminals, wherein the plurality of ISDN terminals each include a switch for setting the number of apparatuses and a unique apparatus number of the own terminal in the apparatus number storage means; Means for obtaining a remainder obtained by dividing the number of seconds of time information output by the clock means by the stored number of apparatuses, and means for comparing the obtained remainder with a unique apparatus number of the own terminal. IS according to claim 2
DN subscriber equipment. 5. A network terminating device for an ISDN line, and a plurality of ISDN terminals connected to the network terminating device via a bus, wherein each of the plurality of ISDN terminals performs communication control, A central control unit that controls the inside of the terminal, a recording unit that records the received document, and a document stacker that discharges and accumulates the paper recorded by the recording unit; the central control unit performs the communication control Means for detecting a call setting message from the means, and detecting whether a sub-address is added to the call setting message from the call setting detecting means. A sub-address detecting means for detecting the sub-address detecting means; It IS including a response means for transmitting the derived
In the DN subscriber unit, the central control unit includes a timer that times out at a set time and activates the response unit, and whether or not there is a response wait set in advance when a detection result of the sub address detection unit does not add a sub address. Response wait determining means for determining whether or not there is a response wait based on information; the document stacker includes monitoring means for monitoring recording paper on the document stacker; and the central control unit monitors the monitoring means. And a remaining amount detecting unit configured to detect a remaining amount of the recording sheet based on a result, wherein the remaining amount detecting unit determines the remaining amount of the recording sheet when the result of the determination by the response waiting determining unit indicates that there is a response waiting. A remaining time detecting means for setting a corresponding time in the timer and starting the response means, wherein the response waiting determining means determines that the response means has no response waiting if the determination result indicates that there is no response waiting; ISDN subscriber apparatus which comprises a means for activating.