JP3792166B2 - Internet facsimile machine - Google Patents

Internet facsimile machine Download PDF

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Publication number
JP3792166B2
JP3792166B2 JP2002052255A JP2002052255A JP3792166B2 JP 3792166 B2 JP3792166 B2 JP 3792166B2 JP 2002052255 A JP2002052255 A JP 2002052255A JP 2002052255 A JP2002052255 A JP 2002052255A JP 3792166 B2 JP3792166 B2 JP 3792166B2
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time
means
communication
ping
facsimile apparatus
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JP2003259070A (en
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直樹 太田
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株式会社リコー
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an Internet-compatible network facsimile apparatus that is connected to the Internet and transmits and receives image data.
[0002]
[Prior art]
Facsimile devices can easily transmit and receive image data such as characters and graphics, and are therefore widely used as familiar OA devices. 2. Description of the Related Art In recent years, with the spread of the Internet and LAN (local area network), an Internet-compatible network facsimile apparatus (referred to as an Internet facsimile apparatus) has become widespread. Internet facsimile machines that can transmit and receive using this mechanism have also become widespread. However, this type of Internet facsimile machine has a problem in that it is difficult to immediately check the communication capability between the facsimile machines, making it difficult to perform communication utilizing each function. A network facsimile machine (real-time internetwork facsimile machine, hereinafter referred to as “RTI facsimile machine”) has been proposed. Regarding a conventional RTI facsimile apparatus, for example, Japanese Patent Application Laid-Open No. 2001-197279 discloses an RTI facsimile apparatus configured so that the number of redundant packets to be added can be set and highly reliable communication can be performed.
[0003]
[Problems to be solved by the invention]
However, the conventional RTI facsimile apparatus has the following problems. That is, in a network such as the Internet, when a large number of connected computers and terminal devices perform data communication and data collision (collision) occurs frequently (such a state of the network is referred to as “network load is high. ITU-T Recommendation T.). There is a problem in that various timeout timers defined in H.38 time out. To deal with this problem, it is conceivable to update the timer value of the timer according to the network load status (data collision occurrence status). If the timer value is updated, there will be no timeout and proper communication will be possible. However, if the network load is high, the number of line disconnections will exceed the number of calls, and communication may not be completed normally. .
The present invention has been made to solve the above-described problems. In an Internet facsimile apparatus, the communication quality can be improved by appropriately setting the number of calls depending on the network load. Objective.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an Internet facsimile apparatus having means for connecting to a network and real-time facsimile communication means for transmitting and receiving image data by packet communication via the Internet. Storage means for storing the number of line disconnections occurring when communication is performed, means for storing the number of line disconnections in the means, and real-time facsimile communication using the number of line disconnections stored in the storage means The Internet facsimile apparatus is provided with means for setting the number of calls when the means performs a re-calling operation.
This internet facsimile machine compares a ping command issuing means for issuing a ping command with a ping response time transmitted in response to the ping command issued by the means and a threshold time set with a constant value. Means and a call frequency adjusting means for adjusting the call frequency according to a comparison result by the means may be provided.
[0005]
Further, an operation input means for setting a threshold time is provided, and the comparison means is configured to compare the ping response time with the corrected threshold time corrected by the operation input means, and the comparison result of the comparison means In response, the call frequency adjustment means may be configured to adjust the call frequency.
Further, the number of calls is adjusted using table storage means that associates the packet delay time with the number of calls, and the corresponding call number of the table storage means that corresponds to the packet delay time set in the search key. It is good to be configured to do so.
Further, the response time storage means for each time zone that stores the time zone area and the ping response time area in association with each other, and the ping response time obtained by the ping command issuing means issuing a ping command at regular intervals is constant. Means for adding up the time to obtain an average value of the ping response time, and storing the obtained average value in the time zone area of the corresponding time zone, wherein the comparison means is set as a search key. It is preferable that the average value of the ping response time corresponding to a certain time zone is compared with the threshold time or the corrected threshold time.
[0006]
Further, the present invention provides a ping command issuing means for issuing a ping command in an Internet facsimile machine having means for connecting to a network and real-time facsimile communication means for transmitting and receiving image data by UDP packet communication via the Internet, and the means The comparison means for comparing the ping response time transmitted in response to the ping command issued by the method and the threshold time for which a constant value is set, and the UDP packet communication is transmitted according to the comparison result by the means There is also provided an Internet facsimile machine provided with means for adjusting the number of redundant packets.
[0007]
This Internet facsimile machine includes a time zone response time storage means for storing a time zone area and a ping response time area in association with each other, and a ping response obtained by the ping command issuing means issuing a ping command at regular intervals. Means for adding a time for a fixed time to obtain an average value of the ping response time, and storing the obtained average value in the time zone area of the corresponding time zone, wherein the comparison means is used as a search key. It is good to be comprised so that the average value of the ping response time corresponding to the set time slot | zone and the said threshold time may be compared.
Further, means for selecting a time zone in which the ping response time stored in the time zone response time storage means is minimum, and means for causing the real-time facsimile communication means to wait until the time zone selected by the means is reached. It is good to provide.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
2 and 3 are system configuration diagrams of a real-time Internet facsimile system (hereinafter referred to as “RTI facsimile system”) constituted by the Internet facsimile apparatus according to the present invention. The RTI facsimile system is an ITU-T recommendation T.30. T.38 compliant with T.38. 38 is configured to transmit and receive facsimile image data by packet communication using the 38 communication procedure, and the system configuration shown in FIGS. 2 and 3 can be considered. The present invention can be applied to any of the systems shown in FIGS.
[0009]
The RTI facsimile system shown in FIG. 2 is called a so-called gateway type, and is equipped with an analog public network (PSTN network) 31 and 31 and a real-time Internet facsimile function (hereinafter referred to as “RTI facsimile function”) via the Internet 50. The G3 facsimile apparatus 30 and the G3 facsimile apparatus 40 equipped with the same function are configured to communicate with each other. In this system, a G3 facsimile apparatus 30 and a G3 facsimile apparatus 40 are connected to gateway apparatuses 32 and 42 via analog public networks (PSTN networks) 31 and 31, and the gateway apparatuses 32 and 42 are connected to the Internet 50. Has been configured. For communication between the G3 facsimile apparatus 30 and the gateway apparatus 32 and communication between the G3 facsimile apparatus 40 and the gateway apparatus 42, the ITU-T recommendation T.264 is used. 30 in accordance with T.30. 30 communication procedure is applied, and ITU-T recommendation T.30 is used for communication between the gateway device 32 and the gateway device 42. T.38 compliant with T.38. 38 communication procedures apply. Note that a gatekeeper device 51 is connected to the Internet 50.
[0010]
The RTI facsimile system shown in FIG. The RTI facsimile apparatus 100 mainly having a communication function based on the 38 communication procedure and the RTI facsimile apparatus 200 are configured to perform direct (direct) communication only via the Internet 50. For communication between the RTI facsimile apparatus 100 and the RTI facsimile apparatus 200, T.I. 38 communication procedures are applied, and each of them and the gatekeeper device 51 are ITU-T Recommendation H.264. H.323 conforming to H.323. The H.323 communication procedure is applied to perform address translation, network control, call control, and the like.
[0011]
As an internal configuration of the Internet facsimile machine that realizes the communication function shown in FIG. 3, the configuration shown in FIG. 4 can be considered. FIG. 4 is a block diagram showing the main internal configuration of the RTI facsimile apparatus 100. As shown in the figure, the RTI facsimile machine 100 includes a CPU 101, a ROM 102, a RAM 103, and an image storage memory 104, a LAN controller 105, a transformer 106, a modem 107, and an NCU 108, a DCR 109, a scanner. 110, a plotter 111, and an operation panel (also referred to as an operation panel) 112. Components other than the transformer 106 and the NCU 108 are connected to each other via a system bus 113.
[0012]
The CPU 101 is a unit that controls the overall operation of the RTI facsimile apparatus 100 in accordance with a program stored in the ROM 102 and operates as various means that characterize the present invention. The ROM 102 stores a control program executed by the CPU 101, a communication control procedure, a network control procedure, H.264, and the like. Call control procedure according to the H.323 communication procedure; 38 is a read-only storage means for storing a facsimile data transfer procedure according to 38 communication procedures, permanent data, and the like. The RAM 103 is storage means for temporarily storing data necessary for controlling the RTI facsimile apparatus 100 and storing data for performing protocol processing for network control. The image storage memory 104 is a storage unit used for storing files when sending / receiving e-mail and facsimile data.
[0013]
The LAN controller 105 is network control means composed of an LSI or the like that decodes data received from the network, encodes data to be transmitted to the network, and buffers transmission frames and reception frames. The transformer 106 is a transformer for transmitting and receiving data from the network. The modem 107 returns the original binary code to the modulation for enabling transmission of the binary-encoded image data to the public line network (PSTN network) and the code of the modulated image data from the counterpart facsimile machine. For demodulation. The NCU 108 is a detector for detecting and analyzing a DTMF (dual tone multiplexed frequency) signal of a destination facsimile apparatus from the public line network (PSTN network).
[0014]
The DCR 109 compresses and encodes the binary image data read by the scanner 110, and also converts the compressed code transmitted from the partner facsimile machine into a binary image so that it can be printed (printed) by the plotter 111. It is an encoder / decoder for decoding. The scanner 110 is image information reading means for reading data necessary for facsimile transmission operation and reading image information of a document to be transmitted. The plotter 111 is a writing unit that prints and outputs received or accumulated facsimile data or the like on paper. The operation panel 112 includes various operation keys necessary for a user to input information for causing the RTI facsimile apparatus 100 to perform a transmission / reception operation, and a display device such as a liquid crystal display for displaying an operation state. This is an operation input unit in which the user inputs each data by operating various operation keys. It is assumed that information such as the number of calls to be described later is stored in the above-described storage means, for example, the RAM 103.
[0015]
Next, the operation contents of the Internet facsimile apparatus according to the present invention will be described assuming a system configuration as shown in FIG. FIG. 1 illustrates the system configuration of the RTI facsimile system shown in FIG. 3, which includes the RTI facsimile apparatus 100 described above and an RTI facsimile apparatus 200 having the same configuration. In FIG. 1, the RTI facsimile apparatuses 100 and 200 and the Internet 50 are shown, and the other components are not shown. In the following description, it is assumed that the RTI facsimile apparatus 100 operates as a transmission side and the RTI facsimile apparatus 200 operates as a reception side.
The RTI facsimile apparatus 100 and the RTI facsimile apparatus 200 exchange facsimile data with each other by packet communication based on TCP (Transmission Control Protocol) or UDP (User Datagram Protocol).
[0016]
In the case of TCP, two devices (terminal A and terminal B) that exchange communication are performing packet communication as shown in FIG. FIG. 5 is an explanatory diagram showing the contents of packet communication by TCP and the packet format. In FIG. 5, packets a1, a2, and a2 are sequentially transmitted from the terminal A. When the packet a1 is transmitted, the terminal B that has received the packet a1 transmits an acknowledgment packet b1. However, when the packet a2 is transmitted from the terminal A, the confirmation response packet b1 is not transmitted from the terminal B, and a timeout occurs, so the packet a2 is continuously transmitted. Further, in the case of TCP, there is a delay in waiting for an acknowledgment packet on the terminal A side, but the packet order and the contents are guaranteed. The packet format in this case is T.264. 30 data (HDLC information such as DIS / DCS and image data) P1; In this configuration, a header P3 is added to the head of the data portion consisting of 30 identifiers (T.30 signal identifiers) P2.
[0017]
In the case of UDP, the terminal A and the terminal B exchanging communication are performing packet communication as shown in FIG. FIG. 6 is an explanatory diagram showing the contents of packet communication by UDP and the packet format. In the case of UDP, reliability is low because of connectionlessness. Therefore, the UDP packet format is T.264. 30 data P1 and T.30. A sequence number P4 is added to the 30 identifier P2 for order alignment, and a previously transmitted packet (redundant packet) P5 is added for error recovery when the packet is lost to form a data portion. The header P3 is added to the head of the. Thus, the reliability of connectionless UDP communication is improved.
[0018]
In FIG. 6, the packet A10 is a packet a10 obtained by adding the packets a0 and a1 transmitted before the packet a2 to the terminal A, and the packet a3 is added by the packets a1 and a2 transmitted before the packet a3. a11, a packet a12 obtained by adding the packets a2 and a3 transmitted before the packet a4, and a packet a13 obtained by adding the packets a3 and a4 transmitted previously to the packet a5 are sequentially transmitted. At that time, assuming that the packet a12 has been lost, error recovery is performed using the error correction packet (packet a4) added to the packet a13.
When the real-time facsimile communication operation is performed and image data is transmitted from the RTI facsimile apparatus 100 to the RTI facsimile apparatus 200, the RTI facsimile apparatus 100 and the RTI facsimile apparatus 200 perform communication as shown in FIG. FIG. 7 is an explanatory diagram showing an outline of the first communication between the RTI facsimile apparatus 100 and the RTI facsimile apparatus 200 using a TCP packet.
[0019]
In the RTI facsimile apparatus 100, when a user operates the operation panel 112 to instruct reading of a document, the scanner 110 reads an image of the document and outputs image data. Further, when information (address information) for specifying a transmission destination of the RTI facsimile apparatus 100, for example, an IP address, is input, transmission of image data obtained by the RTI facsimile function is instructed. Then, the LAN controller 105 and the transformer 106 operate as real-time facsimile communication means, and the first real-time facsimile communication a for transmitting the image data by packet communication is executed. When transmission is performed by the RTI facsimile function, a computer or a terminal device (not shown) connected to the Internet 50 performs a large number of data communications, data collision occurs frequently, the transmission data is broken, and the network load is high. It may be. When the line disconnection occurs several times in the real-time facsimile communication and the CPU 101 catches the multiple line disconnection, the RTI facsimile apparatus 100 executes an operation b in which the RAM 103 stores the number of line disconnections at that time in the RAM 103. Subsequently, the second communication preparation c is executed. It is assumed that a predetermined default value (default number of calls) is set as the number of calls during the first communication.
[0020]
Here, the number of calls in facsimile communication using the RTI function will be described. When the network load is high in the RTI facsimile apparatus 100, a timeout may occur due to loss of a packet, and the line may be disconnected and image data may not be transmitted to the transmission destination and may not be delivered. As this recovery operation, a re-calling operation is performed, and the number of re-calls at this time is set as the number of calls.
Next, when the RTI facsimile apparatus 100 performs real-time facsimile communication operation and transmits image data, the CPU 101 sets the number of call disconnections stored in the RAM 103 in order to set the number of calls using the previous communication history. Read out and set the number of calls d in accordance with equation (1).
Formula 1 Number of calls = Line disconnection times + n (n is the default number of calls)
[0021]
Based on the number of calls thus obtained, the RTI facsimile apparatus 100 executes a second real-time facsimile communication operation e for the RTI facsimile apparatus 200. At that time, when the network load is high again and the line disconnection occurs, the CPU 101 executes the operation f for storing the number of line disconnections at that time in the RAM 103, and subsequently sets the number of calls as described above. Based on the number of times, the third real-time facsimile communication operation is executed. Thereafter, similarly, the next number of calls is set from the previous communication history, and the real-time facsimile communication operation is executed based on the set number of calls. As described above, in the RTI facsimile apparatus 100, when a network disconnection occurs due to a high network load, the previous communication history is referred to, and the real-time facsimile communication operation is performed according to the number of calls set using the previous line disconnection count. Execute. Therefore, the real-time facsimile communication operation reflects the immediately preceding network load situation, and the number of calls is set according to the load situation, so that communication quality such as connectivity can be improved.
[0022]
Next, second communication between the RTI facsimile apparatus 100 and the RTI facsimile apparatus 200 using a TCP packet will be described. In the second communication, as described above, prior to executing the real-time facsimile communication operation, the default number of calls n is adjusted according to the network load status at the time of communication.
As shown in FIG. 8, the RTI facsimile apparatus 100 issues a ping command issuance h using the IP address or host name of the RTI facsimile apparatus 200 as a transmission destination after executing preparation g for the real-time facsimile communication operation. Execute and investigate the network load status. That is, the RTI facsimile apparatus 100 executes reception i of a packet delay time (hereinafter referred to as “ping response time”) that the RTI facsimile apparatus 200 transmits in response to the ping command, and determines the network load status from the ping response time to the CPU 101. Judgment by.
[0023]
As described above, data collisions occur frequently when the network load is high, so that the ping command transmission is repeated many times, the response from the receiver becomes slow, the packet delay time becomes long, and the ping response time becomes long. . Conversely, if the network load is low, the ping response time is shortened. From this, it is considered that the network load situation can be judged from the ping response time, though it is simple. Subsequently, according to the flowchart shown in FIG. 12, a call number adjustment process j is executed to adjust the default call number n. In FIG. 12, step is abbreviated as S.
[0024]
When the calling frequency adjustment process j starts, the process proceeds to step 1 where the CPU 101 determines whether or not the ping response time is equal to or less than a predetermined time (hereinafter referred to as “threshold time”). If the time is equal to or less than the threshold time, the network load is low and the process proceeds to step 2. If the time is longer than the threshold time, the network load is high and the process proceeds to step 3. When the CPU 101 proceeds to step 2, the CPU 101 executes a process of reducing the default number of calls n by a fixed number. When the process proceeds to step 3, the CPU 101 executes a process of increasing the default number of calls n by a fixed number, and then the number of calls adjustment process. Exit j. When this adjustment process j is completed, the processes after the real-time facsimile communication a are executed as shown in FIG. 7 using the default number of calls n adjusted by the adjustment process j.
[0025]
When real-time facsimile communication is executed as in the first communication, the number of calls is set by referring to the previous communication history, so that the number of calls matches the network load situation when the communication is actually executed. May not be set. However, when the above-described call number adjustment processing j is executed, a ping command is issued before the communication starts, and the call number is adjusted after comparing the ping response time and the threshold time. It is set according to the network load situation at the time, and communication quality such as connectivity can be further improved.
Next, the third communication using the TCP packet between the RTI facsimile apparatus 100 and the RTI facsimile apparatus 200 will be described. In the third communication, as described above, it is possible to change the threshold time used when the call frequency adjustment process is performed.
[0026]
As shown in FIG. 9, the RTI facsimile machine 100 executes preparation g for real-time facsimile communication operation, issuance of a ping command h, and reception i of a ping response time, and subsequently makes a call frequency adjustment process k according to the flowchart shown in FIG. To adjust the number of calls. In FIG. 13, step is abbreviated as S. When the call count adjustment process k starts, the process proceeds to step 4 where the CPU 101 determines whether or not the ping response time is equal to or shorter than the time (corrected threshold time) set by operating the operation panel 112. If it is less than the correction threshold time, the process proceeds to Step 2, and if it is longer than the correction threshold time, the process proceeds to Step 3. The processes in steps 2 and 3 are the same as described above. Thereafter, real-time facsimile communication is executed in the same manner as the second communication. In the second communication, since the threshold time is a constant value, the number of calls that matches the user's network environment may not always be set. There is a risk that it will not finish. However, in the case of the third communication, the user can set the threshold time, so the number of calls can be set according to the user's network environment, and communication quality such as connectivity can be further improved. Improvement is possible.
[0027]
Next, the fourth communication using the TCP packet between the RTI facsimile apparatus 100 and the RTI facsimile apparatus 200 will be described. In the fourth communication, the call number setting process referring to the table A shown in FIG. 14 is performed.
The table A has a packet delay time area A1 and a call count area A2, stores the packet delay time and the call count in association with each other, and is provided in the RAM 103. Then, as shown in FIG. 10, preparation g for real-time facsimile communication operation, issuance of ping command h, and reception i of ping response time are sequentially executed. Subsequently, the packet delay time acquired by the ping command is set as a search key, the table A is searched, the corresponding number of calls corresponding to the search key is acquired from the call count area A2, and the call count determination processing l is executed. Thereafter, the determined number of corresponding calls is used as the default number of calls n, and the subsequent real-time facsimile communication a is executed as in the second communication. In the third communication described above, in order to adapt the number of calls to the network environment, the user has to set the threshold time. In the fourth communication, the number of calls is determined by the packet delay time acquired by the ping command. Since it is set dynamically, it is possible to set the number of outgoing calls suitable for the network environment without the user having to set the threshold time, which is convenient for the user.
[0028]
Next, the fifth communication using the TCP packet between the RTI facsimile apparatus 100 and the RTI facsimile apparatus 200 will be described. In the fifth communication, the table B shown in FIG. 15 is created, the ping response time is acquired at regular time intervals, and the network load status is investigated for each time zone.
The table B has a time zone area B1 and a ping response time area B2, and is divided into fixed time intervals from midnight to 24:00, and the response time of each time zone can be stored in the RAM 103. Is provided. In the fifth communication, the RTI facsimile apparatus 200 as the destination is registered (stored) in the RAM 103 of the RTI facsimile apparatus 100 as a transmission destination by a one-touch dial or an abbreviated dial.
[0029]
In the RTI facsimile apparatus 100, as shown in FIG. 11, the CPU 101 accesses the RAM 103 and sends a ping command to the destination of the RTI facsimile apparatus 200 registered by one-touch dial or speed dial at regular intervals. The issuing ping command issuance m is executed to check the network load status at regular intervals. In other words, the RTI facsimile apparatus 100 executes the reception i of the ping response time transmitted from the RTI facsimile apparatus 200 at regular intervals. Then, the response time obtained by executing the reception i is accumulated (added) for a fixed time, the average value of the ping response time is calculated from the accumulated value for each time zone, and the obtained average value is calculated as the time. The time zone response time calculation process o stored in the corresponding time zone of the zone area B1 is executed.
[0030]
Thereafter, when the RTI facsimile apparatus 100 executes a real-time facsimile communication operation with respect to the RTI facsimile apparatus 200, the table B is searched without issuing a ping command after executing the preparation g for the real-time facsimile communication operation. The average value of the ping response time corresponding to the time zone set in the search key is obtained, the average value is compared with the threshold value or the modified threshold value, and the number of calls is set (p). ˜Process similar to the fourth communication is executed. If the ping command is issued before the start of communication and the number of calls is determined from the ping response time as in the second to fourth communication, overhead is imposed on the pre-processing of communication. Thus, if the response time is set without issuing the ping command, the overhead of issuing the ping command before the start of communication is eliminated, and the communication performance can be improved.
[0031]
Next, the sixth communication using the UDP packet between the RTI facsimile apparatus 100 and the RTI facsimile apparatus 200 will be described. In the sixth communication, the UDP packet communication is executed by adjusting the number of redundant packets according to the network load situation.
As shown in FIG. 16, the RTI facsimile machine 100 executes the ping command issuance h using the IP address of the RTI facsimile machine 200 and executes the reception i of the ping response time transmitted from the RTI facsimile machine 200. Then, the CPU 101 determines the network load status from the ping response time. Subsequently, the redundant packet number adjustment process q is performed according to the flowchart shown in FIG. 19 to adjust the redundant packet number. In FIG. 19, step is abbreviated as S. When the redundant packet number adjustment process q starts, the CPU 101 executes step 1 to determine whether or not the ping response time is equal to or less than a certain threshold time. If the threshold time is equal to or less, the CPU 101 proceeds to step 5. The number of redundant packets shown in FIG. 6 is reduced, and if it is longer than the threshold time, the process proceeds to step 6 to increase the number of redundant packets. After step 5 or step 6, the post-processing is terminated. When the adjustment process q is completed, the packet communication r with the adjusted number of redundant packets added is executed.
[0032]
When performing real-time facsimile communication, when performing UDP packet communication, redundant packet control is performed to improve reliability. At this time, if the network load is low, redundant packets are added unnecessarily and the communication speed is lowered. If the network load is high, packet loss more than the number of redundant packets may occur and an error may occur. According to the RTI facsimile apparatus 100 according to the present invention, since control for adjusting the number of redundant packets to be added is performed according to the network load situation, unnecessary redundant packets are not added, and communication speed and connectivity are improved. Communication quality can be improved.
Next, a seventh communication between the RTI facsimile apparatus 100 and the RTI facsimile apparatus 200 using a UDP packet will be described. In the seventh communication, the redundant packet number adjustment process with reference to the table B shown in FIG. 15 is performed. In the seventh communication, the RTI facsimile apparatus 200 is registered (stored) in the RAM 103 of the RTI facsimile apparatus 100 as a transmission destination by a one-touch dial or an abbreviated dial.
[0033]
Then, as shown in FIG. 17, in the RTI facsimile apparatus 100, the CPU 101 accesses the RAM 103, issues a ping command issuance m at regular intervals, and executes a reception i of a ping response time transmitted each time. . Then, the response time obtained by executing the reception i is accumulated (added) for a fixed time, the average value of the ping response time is calculated from the accumulated value for each time zone, and the obtained average value is calculated as the time. The time zone response time calculation process o stored in the corresponding time zone of the zone area B1 is executed. Thereafter, when the transmission operation s is started and the real-time facsimile communication operation is executed, the table B is searched without issuing the ping command, and the average of the ping response times corresponding to the time zone set in the search key Then, the redundant packet number adjustment process t is executed according to the flowchart shown in FIG. This redundant packet number adjustment process t is the same as the redundant packet number adjustment process q described above except that step 7 is different. In Step 7, the same processing as Step 1 is executed except that the average value of the ping response time obtained from Table B is compared with the threshold time. Thereafter, the packet communication r with the adjusted number of redundant packets added is executed.
[0034]
As in the sixth communication, if the ping command is issued before the start of communication and the number of calls is set from the response time, overhead is required for the pre-processing of communication. However, as in the seventh communication, If the number of calls is set without issuing a ping command, the overhead of issuing the ping command before the start of communication is eliminated, and the communication performance can be improved.
Next, the eighth communication using the UDP packet between the RTI facsimile apparatus 100 and the RTI facsimile apparatus 200 will be described. In the eighth communication, a real time facsimile communication operation is executed by selecting a time zone with a small network load.
[0035]
As in the seventh communication, the ping command issuance m is executed at regular intervals, the ping response time reception i, the time zone response time calculation process o is executed, and the real-time facsimile communication operation u by memory transmission is performed. Execute. Subsequently, the CPU 101 executes time zone selection v for selecting the time zone with the smallest network load (the time zone with the minimum ping response time) with reference to Table B. Then, the RTI facsimile apparatus 100 waits for the real-time facsimile communication operation until the time zone selected by the time zone selection v is reached, and when the time zone is reached, the adjusted number of redundant packets are added and packet communication r is added. Execute. In the seventh communication, an appropriate number of redundant packets corresponding to the packet delay time at the time of performing communication is added to perform memory transmission. If the network load at that time is high, the communication speed, connection The communication quality such as performance will be degraded. On the other hand, if memory transmission is performed to the destination registered in the one-touch dial, speed dial, etc. as in the case of the eighth communication, packet communication can be performed in the time zone with the smallest packet delay, so communication speed, connectivity, etc. Communication quality can be further improved.
[0036]
【The invention's effect】
As described above, according to the Internet facsimile apparatus of the present invention, since the number of calls is set according to the network load situation, it is possible to improve communication quality such as connectivity.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of an RTI facsimile system including two RTI facsimile apparatuses according to the present invention.
FIG. 2 is a system configuration diagram of a real-time Internet facsimile system constituted by an Internet facsimile apparatus according to the present invention.
FIG. 3 is a system configuration diagram of a real-time Internet facsimile system different from FIG. 2;
FIG. 4 is a block diagram showing a main internal configuration of an RTI facsimile apparatus according to the present invention.
FIG. 5 is an explanatory diagram showing the contents of packet communication by TCP and the packet format.
FIG. 6 is an explanatory diagram showing contents of packet communication by UDP and a packet format.
FIG. 7 is an explanatory diagram showing an outline of first communication using TCP packets of two RTI facsimile apparatuses according to the present invention;
FIG. 8 is an explanatory diagram showing an outline of second communication by TCP packets of two RTI facsimile apparatuses according to the present invention.
FIG. 9 is an explanatory diagram showing an outline of third communication by TCP packets of two RTI facsimile apparatuses according to the present invention.
FIG. 10 is an explanatory diagram showing an outline of fourth communication using TCP packets of two RTI facsimile apparatuses according to the present invention;
FIG. 11 is an explanatory diagram showing an outline of fifth communication using TCP packets of two RTI facsimile apparatuses according to the present invention;
FIG. 12 is a flowchart showing a procedure of call number adjustment processing of second communication using a TCP packet.
FIG. 13 is a flowchart illustrating a procedure of call number adjustment processing for third communication using a TCP packet;
FIG. 14 is a diagram illustrating the contents of a table that stores a packet delay time and the number of calls used in the fourth communication using TCP packets in association with each other.
FIG. 15 is a diagram illustrating the contents of a table that stores a time zone area and a ping response time area used in fifth communication using TCP packets in association with each other.
FIG. 16 is an explanatory diagram showing an outline of sixth communication using UDP packets of two RTI facsimile apparatuses according to the present invention;
FIG. 17 is an explanatory diagram showing an outline of seventh communication by UDP packets of two RTI facsimile apparatuses according to the present invention;
FIG. 18 is an explanatory diagram showing an outline of eighth communication by UDP packets of two RTI facsimile apparatuses according to the present invention;
FIG. 19 is a flowchart illustrating a procedure of a redundant packet number adjustment process for sixth communication using a UDP packet;
FIG. 20 is a flowchart illustrating a procedure of a redundant packet number adjustment process for seventh communication using a UDP packet;
[Explanation of symbols]
30, 40: G3 facsimile machine
31: Analog public network (PSTN network)
32, 42: Gateway device
50: Internet 51: Gatekeeper device
100, 200: RTI facsimile machine
101: CPU 102: ROM
103: RAM 104: Image storage memory
105: LAN controller 106: Transformer
107: Modem 108: NCU
109: DCR 110: Scanner
111: Plotter 113: System bus
112: Operation panel

Claims (8)

  1. In an Internet facsimile machine having means for connecting to a network and real-time facsimile communication means for transmitting and receiving image data by packet communication via the Internet,
    Storage means for storing the number of line disconnections that occur when real-time facsimile communication is performed by the real-time facsimile communication means;
    Means for storing the number of line disconnections in the means;
    An internet facsimile apparatus comprising: means for setting the number of calls when the real-time facsimile communication means performs a re-calling operation using the number of line disconnections stored in the storage means.
  2. The internet facsimile apparatus according to claim 1, wherein
    a ping command issuing means for issuing a ping command;
    A comparison means for comparing a ping response time transmitted in response to the ping command issued by the means and a threshold time set with a constant value;
    An internet facsimile apparatus comprising: a calling frequency adjusting means for adjusting the calling frequency according to a comparison result by the means.
  3. The Internet facsimile apparatus according to claim 2, wherein
    An operation input means for setting the threshold time is provided,
    The comparison means is configured to compare the ping response time with the corrected threshold time corrected by the operation input means, and the call frequency adjustment means adjusts the call frequency according to the comparison result of the comparison means. An Internet facsimile machine configured to adjust the frequency.
  4. The internet facsimile apparatus according to any one of claims 2 and 3,
    A table storage means that associates the packet delay time with the number of calls;
    An internet facsimile apparatus, wherein the number of calls is adjusted using a corresponding number of calls in the table storage means corresponding to a packet delay time set in a search key.
  5. The internet facsimile apparatus according to any one of claims 2 to 4,
    A time zone response time storage means for storing the time zone area and the ping response time area in association with each other;
    The ping command issuing means adds a ping response time obtained by issuing a ping command every fixed time for a fixed time to obtain an average value of the ping response time, and the calculated average value of the corresponding time zone Means for storing in the time zone area;
    The Internet facsimile apparatus, wherein the comparing means is configured to compare an average value of ping response times corresponding to a time zone set in a search key with the threshold time or the modified threshold time.
  6. In an Internet facsimile machine having means for connecting to a network and real-time facsimile communication means for transmitting and receiving image data by UDP packet communication via the Internet,
    a ping command issuing means for issuing a ping command;
    A comparison means for comparing a ping response time transmitted in response to the ping command issued by the means and a threshold time set with a constant value;
    Means for adjusting the number of redundant packets transmitted by the UDP packet communication in accordance with a comparison result by the means;
  7. The Internet facsimile apparatus according to claim 6, wherein
    A time zone response time storage means for storing the time zone area and the ping response time area in association with each other;
    The ping command issuing means adds a ping response time obtained by issuing a ping command every fixed time for a fixed time to obtain an average value of the ping response time, and the calculated average value of the corresponding time zone Means for storing in the time zone area;
    An internet facsimile apparatus, wherein the comparing means is configured to compare an average value of ping response times corresponding to a time zone set in a search key with the threshold time.
  8. The Internet facsimile apparatus according to claim 7, wherein
    Means for selecting a time zone in which the ping response time is stored in the time zone response time storage means; and
    An internet facsimile apparatus comprising means for waiting the real-time facsimile communication means until a time zone selected by the means is reached.
JP2002052255A 2002-02-27 2002-02-27 Internet facsimile machine Expired - Fee Related JP3792166B2 (en)

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JP5141197B2 (en) * 2007-11-13 2013-02-13 富士通株式会社 Encoder
JP5735969B2 (en) 2009-09-30 2015-06-17 エバン ブイ チュラプコ, System and method for analyzing social graph data for determining connections within a community
US20110099164A1 (en) 2009-10-23 2011-04-28 Haim Zvi Melman Apparatus and method for search and retrieval of documents and advertising targeting
US9264329B2 (en) 2010-03-05 2016-02-16 Evan V Chrapko Calculating trust scores based on social graph statistics
US9922134B2 (en) 2010-04-30 2018-03-20 Www.Trustscience.Com Inc. Assessing and scoring people, businesses, places, things, and brands
US10311106B2 (en) 2011-12-28 2019-06-04 Www.Trustscience.Com Inc. Social graph visualization and user interface
US9578043B2 (en) 2015-03-20 2017-02-21 Ashif Mawji Calculating a trust score
US20170235792A1 (en) 2016-02-17 2017-08-17 Www.Trustscience.Com Inc. Searching for entities based on trust score and geography
US9438619B1 (en) 2016-02-29 2016-09-06 Leo M. Chan Crowdsourcing of trustworthiness indicators
US9679254B1 (en) 2016-02-29 2017-06-13 Www.Trustscience.Com Inc. Extrapolating trends in trust scores
US9721296B1 (en) 2016-03-24 2017-08-01 Www.Trustscience.Com Inc. Learning an entity's trust model and risk tolerance to calculate a risk score
US10180969B2 (en) 2017-03-22 2019-01-15 Www.Trustscience.Com Inc. Entity resolution and identity management in big, noisy, and/or unstructured data

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