JP3724327B2 - Response transmission method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is composed of a single parent device and a plurality of child devices under the parent device, and a command for requesting initial condition setting from the plurality of child devices (hereinafter simply referred to as “setting command”). In response to a response transmission method in which the parent device returns a response to the parent device, in particular, it is possible to reduce the response creation load and the transmission load on the parent device side, and the parent device and the plurality of responses by response transmission. The present invention relates to a response transmission method capable of avoiding a decrease in transmission efficiency of a transmission path between child devices.
[0002]
However, there are many systems in which a single parent device and a plurality of child devices under the parent device are configured, and the parent device transmits responses to setting commands from the plurality of child devices. For example, so are subscriber optical communication systems and supervisory control systems. Furthermore, there are a plurality of network configurations in both the subscriber optical communication system and the supervisory control system.
[0003]
Therefore, the technology is clarified only by a system that is composed of one parent device and a plurality of child devices under the parent device, and the parent device transmits a response to a setting command from the plurality of child devices. Because it is difficult, here, it is abbreviated as "Optical Network Unit: Usually" ONU "in Passive Double Star System, which is one of the subscriber optical communication systems. Optical subscriber line terminator (usually abbreviated as “OLT” in many cases) in response to a setting command from an example, a response transmission method in which a response is returned as an example. It is possible to reduce the response transmission load of the subscriber line termination device and avoid a decrease in the transmission efficiency of the optical transmission line due to the response transmission Doo is that slide into specifically described by the response transmission scheme Examples which may.
[0004]
Therefore, the present invention is not limited to the optical subscriber line transmission system, and moreover, it is not limited to the passive double star system. This will be described again after the embodiment of the present invention has been described in detail.
[0005]
FIG. 22 is an outline of the configuration of an information transmission system to which the passive double star system is applied.
[0006]
In FIG. 22, reference numeral 1 denotes an operation system for monitoring and controlling the entire information transmission system (in the figure, Operation System is abbreviated as “OpS”. In the following, the same is also indicated in the figure). 2 is an optical subscriber line termination device (OLT), 3 is a star coupler, 4-1 to 4-4 are abbreviated as “ONU” in the figure. 5-1 and 5-2 are hubs connected to respective optical network units to branch and supply information to a plurality of terminals, and 6-1 and 6-2 are one type of terminals. Personal computers (abbreviated as “PC” in the figure), 7-1 and 7-2 are telephones that are one type of terminals, and 8-1 and 8-2 are televisions and videos that are one type of terminals.・ Tape recorder (In the figure, it is abbreviated as "TV". The information transmission system is configured by the above-described components.
[0007]
Each optical network unit is equipped with an Ethernet interface (abbreviated as “Ether IF” in the figure. In the following, it is also indicated in the figure in the same manner). Communicates with the router interface via the subscriber unit.
[0008]
Reference numeral 9 is a router for connecting the information transmission system to the network side, 10 is the Internet, which is a typical computer network, and 11 is a provider host managed by an information provider connected to the Internet 10.
[0009]
The optical subscriber line terminating device 2 is abbreviated as “Operation System Interface” (in the figure, “OpS-IF”) that communicates with the operation system 1. Note that “IF” is an abbreviation of “Interface”) 21, and a router interface (in the figure, abbreviated as “router IF”) that communicates with the router 9. 22) A formatter (abbreviated as "FMT" in the figure) for connecting a plurality of router interfaces and a plurality of optical subscriber units to realize a cross-connect function in the optical subscriber line terminator. 23) Communication between the router interface 22 and a plurality of optical network units arranged on a highway connected to the router interface 22 Optical subscriber unit (Optical Subscriber)
Unit: Abbreviated as “OSU” in the figure. The same applies to the subsequent figures. ) 24-1 and 24-2.
[0010]
In a typical example, the router interface 22 has four ports on the network side and eight highways (in the figure, “HW” abbreviated as Highway) on the inner side of the optical subscriber line terminating device 2. From this point on, it can be stored similarly in the figure.
[0011]
Each star coupler can have up to 32 branches in a typical example.
[0012]
Therefore, a maximum of 8 × 32 = 256 optical network units can be accommodated in a single router interface.
[0013]
The Ethernet interface installed in each optical network unit transmits a setting command to the router interface 22 after completion of the line connection at the time of starting up the information transmission system, and sets initial conditions. Request. The setting command is transmitted by each optical network unit independently or in unicast in a specified order.
[0014]
When the router interface 22 receives the setting command, the router interface 22 creates a response based on the setting data set in advance from the operation system 1 or the setting data held in the router interface 22 to generate an optical network. -Return to the unit side.
[0015]
Since the maximum number of optical network units that can be accommodated in the router interface 22 is 256, the response transmission load of the router interface 22 when the information transmission system is started up may become large. .
[0016]
In addition, since a maximum of 32 optical network units can be accommodated on a single highway, there is a risk that response transmission will be congested on each highway when the information transmission system is started up.
[0017]
Therefore, in the information communication system shown in FIG. 22, it is important to be able to reduce the load on the router interface 22 at the time of starting up the information transmission system and to avoid a reduction in highway transmission efficiency.
[0018]
[Prior art]
FIG. 15 is a schematic diagram of a response flow in the conventional unicast transmission method.
[0019]
In FIG. 15, 1 is an operation system, 2 is an optical subscriber line terminator, 3-1 and 3-2 are star couplers, 4-1 to 4-4 are optical network units having an Ethernet interface, It is the main part related to the transmission of setting commands and the reception of responses.
[0020]
Note that a plurality of optical network units set with the same setting data form a group called a multicast group. That is, the setting data is managed in units of multicast groups, and the setting data of the Ethernet interface in the same multicast group is the same.
[0021]
The optical subscriber line termination device 2 includes an operation system interface 21, a router interface 22, a formatter 23, and an optical subscriber unit 24-1 that performs communication between the router interface 22 and a plurality of optical network units. Thru 24-2.
[0022]
Each Ethernet interface transmits a setting command to the router interface 22 after completion of line connection at the time of system startup, and requests setting of initial conditions.
[0023]
The router interface 22 that has received the setting command forms a response based on the setting data set in advance from the operation system 1 or the setting data already stored in the router interface 22.
[0024]
FIG. 17 shows a response transmitted during unicast transmission.
[0025]
That is, the response is indicated by a highway number part, a destination multicast group number part (in the figure, “destination MCG number part”, but “MCG” is an abbreviation by the acronym of Multi-CastGroup. In the figure, it is similarly marked.), It is composed of a destination optical network unit number part, a transmission data type part, and a setting data part.
[0026]
Since setting commands arrive from a plurality of Ethernet interfaces, the router interface 22 creates a plurality of responses and temporarily stores them in the transmission buffer.
[0027]
FIG. 18 is a diagram showing the contents of the transmission buffer in the conventional response transmission method.
[0028]
In FIG. 18, a unit rectangle expresses one response, and the response state is expressed by a line type forming the unit rectangle. In other words, the double-line rectangle is the response waiting for transmission, the thick solid-line rectangle is the transmitted response, the thick dashed-line rectangle is the newly stored response, and only the multicast group number described later is described in the rectangle. Yes. In addition, a rectangle of a unit in which a thin solid line multicast group number is not described is an area where a transmitted response is deleted, that is, an empty response.
[0029]
The entire vertically long rectangle obtained by vertically stacking the unit rectangles expresses the storage area or stored contents of the transmission buffer.
[0030]
In the format of transmission data, for example, if the highway number “# 0”, the destination multicast group number “# 1”, the destination optical network unit number “# 0”, and the transmission data type “response” are set, The destination of the transmission data is the optical network unit of the optical network unit number # 0 accommodated in the highway number # 0, that is, the optical network unit 4-1 in FIG. 15, and the transmission data type is the multicast group # 1. It is shown that this is a response in which setting data corresponding to is set.
[0031]
When the response is unicasted, the router interface 22 refers to the highway number (# 0 in the case of FIG. 17) and designates a single response by specifying the highway number (# 0 in the case of FIG. 17). Transmission is made to service unit # 0 (which is HIKARI service unit 24-1), and HIKARI service unit # 0 transmits the response to star coupler 3-1.
[0032]
The star coupler 3-1 branches and transmits the data received from the optical service unit # 0 to the plurality of optical network units connected to the subordinate, and the plurality of optical units connected to the subordinate. A plurality of data received at different timings from the network unit are combined into one optical transmission path and transmitted to the optical service unit.
[0033]
Therefore, the star coupler 3-1 receives the data received from the optical service unit # 0 from the optical network unit # 0 (optical network unit 4-1) in FIG. 15 to the optical network unit # 31 (optical Branch to network unit 4-2) and transmit.
[0034]
The optical network unit that received the data compares the destination optical network unit number in the received data with the optical network unit number set for itself, and if it matches, takes in the received data and does not match If so, the received data is discarded. This is indicated by a thick solid line and a thick broken line on the right side of the star coupler 3-1 in FIG. In other words, the optical network unit # 0 takes in the received data, and the optical network unit # 31 discards the received data (represented by x). A thin solid line on the right side of the star coupler 3-2 in FIG. 15 indicates that no response is transmitted because the highway number is different.
[0035]
If the response transmitted in the response transmission process is the top response a in FIG. 18A, the response becomes a transmitted response by the response transmission process, and the state of the transmission buffer is as shown in FIG. Next, the response indicated by b in FIG. 18B is transmitted, and the response transmission process described above is performed.
[0036]
As a result, the state of the transmission buffer changes as shown in FIG. 18C, the area in which the response a is stored is erased and becomes an empty response, the response b becomes a transmitted response, and the response c is transmitted next. It becomes a response.
[0037]
In the case of the unicast transmission method, the response transmission process as described above is repeated.
[0038]
FIG. 16 is a diagram (part 1) illustrating a conventional response transmission method, and illustrates the above-described sequence according to the unicast transmission method.
[0039]
In FIG. 16, the leftmost vertical line represents a router interface, and the right three vertical lines represent an optical network unit. Then, from the left, each optical network unit has an optical network unit #x (MCG # 1) connected to the highway # 0 and an optical network unit #y (MCG # 1) connected to the highway # 0. The optical network unit #z (MCG # 2) connected to the highway # 1.
[0040]
Each optical network unit naturally sends a configuration command to the router interface in a unicast transmission scheme.
[0041]
Upon receiving the setting command, the router interface creates a response as described above, stores it in the transmission buffer, and transmits the response by unicast. Since the response that can be received by the optical network unit is only the response sent to the highway where the optical network unit is accommodated, the optical network unit checks the optical network unit number and only the response addressed to itself. Capture.
[0042]
On the other hand, in the case of the multicast transmission method, the router interface 22 refers to the multicast group number and transmits a plurality of responses to the designated highway.
[0043]
FIG. 19 is a schematic diagram of a response flow in the multicast transmission method.
[0044]
In FIG. 19, 1 is an operation system, 2 is an optical subscriber line terminating device, 3-1 and 3-2 are star couplers, 4-1 to 4-4 are optical network units having an Ethernet interface, It is the main part related to the transmission of setting commands and the reception of responses.
[0045]
Note that the plurality of optical network units set with the same setting data form a multicast group, as in FIG.
[0046]
The optical subscriber line terminating device 2 includes an operation system interface 21, a router interface 22, a formatter 23, and an optical service unit 24-1 that performs communication between the router interface 22 and a plurality of optical network units. Thru 24-2.
[0047]
Each Ethernet interface transmits a setting command to the router interface 22 after completion of line connection at the time of system startup, and requests setting of initial conditions.
[0048]
The router interface 22 that has received the setting command forms a response based on the setting data set in advance from the operation system or the setting data already stored in the router interface 22.
[0049]
FIG. 21 shows a response to be transmitted at the time of multicast transmission. The structure is the same as that of FIG. 17, but all related highway numbers are written in the highway number part, and all optical signals are written in the destination optical network unit number part. Information “ALL” indicating that it is addressed to the network unit is written. To indicate to all optical network units, for example, the number of digits in the optical network unit number portion is set larger than the number of digits necessary to indicate the address of the existing optical network unit, and “1” is set in all digits. Should be written.
[0050]
The formed response is temporarily stored in the transmission buffer.
[0051]
In the case of the multicast transmission method, responses addressed to the same multicast group are transmitted together. That is, responses with the same multicast group number are collected, and responses with the multicast group number are transmitted to all highways related to all collected responses.
[0052]
This is indicated by a thick solid line and a thick broken line to the right of the star coupler in FIG. Since FIG. 19 assumes a case in which setting data to be set to the optical network unit of multicast group # 1 is transmitted, all the optical network units belonging to multicast group # 1 capture the received data, The optical network unit # 31 having a different group number discards the received data.
[0053]
Then, after the response addressed to the first multicast group is transmitted, the process of transmitting the response addressed to the next multicast group is repeated.
[0054]
FIG. 20 is a diagram (part 2) for explaining the conventional response transmission method, and illustrates the above-described sequence by the multicast transmission method.
[0055]
In FIG. 20, the leftmost vertical line represents the router interface, and the right three vertical lines represent the optical network unit. Each optical network unit is, from the left, an optical network unit #x connected to the highway # 0 belonging to the multicast group # 1, and an optical network connected to the highway # 0 belonging to the multicast group # 1. Unit #y, optical network unit #z connected to highway # 1 belonging to multicast group # 2.
[0056]
Each optical network unit naturally sends a configuration command to the router interface in a unicast transmission scheme.
[0057]
Upon receiving the setting command, the router interface creates a response as described above, stores it in the transmission buffer, and transmits the response using the multicast method. Since the response that can be received by the optical network unit is only the response sent to the multicast group to which the optical network unit belongs, each optical network unit checks the multicast group number, and Import only group setting data.
[0058]
In the case of FIG. 20, since the response transmitted first was the setting data of the multicast group # 1, the optical network unit #x and the optical network unit #y are captured, but the optical network unit #z is multicast.・ Do not import because group numbers are different.
[0059]
Since the response transmitted the second time was the setting data of multicast group # 2, optical network unit #z is captured, but optical network unit #x and optical network unit #y have different multicast group numbers. Do not take in.
[0060]
By repeating the above transmission processing, setting data can be set in all the optical network units that have transmitted the setting command.
[0061]
[Problems to be solved by the invention]
In the case of the unicast transmission method, only one response is transmitted at a time.
[0062]
As described above, the data set in the optical network units belonging to the same multicast group is the same.
[0063]
As shown in FIG. 18, when there are a large number of responses of the same multicast group, in the unicast transmission method in which one response is transmitted at a time, the same setting data is transmitted many times. -The processing load on the interface 22 increases, and the highway is occupied unnecessarily.
[0064]
This means that the processing speed of the router interface 22 and the transmission speed of the highway are reduced, which causes trouble for the user of the information transmission system in the form of an increase in transmission delay.
[0065]
On the other hand, when transmitting by the multicast transmission method, it is possible to reduce the router interface transmission processing by collectively transmitting the setting data of the same multicast group, and to occupy the highway due to the response transmission. It can be avoided.
[0066]
However, when the number of setting commands received is small, or when the number of untransmitted responses remaining in the transmission buffer is small, the processing for collecting responses addressed to optical network units belonging to the same multicast group is performed each time. Is inefficient.
[0067]
In view of such a problem, the present invention provides an example of a passive double star system, which is one method of a subscriber optical communication system, in which an optical subscriber line terminating device side responds to a setting command from an optical network unit. A response transmission method that can reduce the response transmission load of an optical subscriber line terminating device and avoid a decrease in the transmission efficiency of the optical transmission line due to the response transmission is provided for a response transmission method that returns a response. The purpose is to do.
[0068]
[Means for Solving the Problems]
The first invention is
When the number of responses to setting commands from a plurality of optical network units exceeds the transmission mode judgment reference number, the optical subscriber line terminating device transmits the response by a multicast transmission method,
When the number of responses is equal to or less than the transmission mode judgment reference number, the response is transmitted by the unicast transmission method.
Technology.
[0069]
According to the first invention, when a large number of responses are not yet transmitted, they are transmitted by the multicast transmission method. Therefore, it is possible to reduce the number of response transmissions performed by the optical subscriber line terminating device, reduce the load for response transmission, and avoid a decrease in transmission efficiency of the highway used for response transmission. can do.
[0070]
In addition, when the number of responses to be transmitted is small, the setting data is transmitted by the unicast transmission method, so it is not necessary to perform the process of collecting the responses addressed to the optical network units belonging to the same multicast group every time for multicast transmission, The load on the router interface can be reduced.
[0071]
The second invention is the first invention,
This is a technique that allows the number of transmission mode judgment references to be set according to the number of multicast groups supported by the optical subscriber line terminating device.
[0072]
According to the second invention, the transmission mode judgment reference number can be set according to the number of multicast groups supported by the optical subscriber line terminating device. Therefore, it is possible to flexibly select a response transmission form according to the scale of the system.
[0073]
According to a third invention, in the first invention,
The management table for managing the response storage status and transmission form in the transmission buffer in the optical subscriber line terminating device is managed for each transmission form and for each multicast group.
Technology.
[0074]
According to the third invention, the management table for managing the response storage status in the transmission buffer and the transmission form in the optical subscriber line terminating device is managed for each transmission form and for each multicast group. Therefore, it is possible to independently execute response creation and storage processing and transmission processing in the optical subscriber line terminating device during multicast transmission.
[0075]
The fourth invention is the first invention or the second invention,
When it is determined that multicast transmission is to be performed, a plurality of responses stored in the transmission buffer are divided into a single group, and a response of the same multicast group is searched within the group and multicast transmission is performed.
Technology.
[0076]
According to the fourth invention, a plurality of responses stored in the transmission buffer at the time when it is determined to perform the multicast transmission is divided into a single group, and a response of the same multicast group is searched in the group. Multicast transmission. Therefore, the number of times of occupying the highway for response transmission is reduced, and the transmission efficiency can be increased.
[0077]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram for explaining the outline of the response transmission method of the present invention.
[0078]
In FIG. 1, the leftmost vertical line represents a router interface, and the right three vertical lines represent an optical network unit. Each optical network unit is, from the left, an optical network unit #x connected to the highway # 0 belonging to the multicast group # 1, and an optical network connected to the highway # 0 belonging to the multicast group # 1. Unit #y, optical network unit #z connected to highway # 1 belonging to multicast group # 2.
[0079]
Each optical network unit naturally sends a configuration command to the router interface in a unicast transmission scheme.
[0080]
Upon receiving the setting command, the router interface creates a response, stores it in the transmission buffer, and transmits the response to the optical network unit.
[0081]
The first feature of the response transmission system of the present invention is that the number of responses stored in the transmission buffer prior to response transmission and the reference number for determining whether to transmit by the multicast transmission system or the unicast transmission system, The transmission method is selected based on the result of comparison with the transmission mode judgment reference number.
[0082]
That is, as shown in FIG. 1, when the router interface determines that the number of responses is equal to or greater than the transmission mode determination reference number (in the drawing, it is simply abbreviated as “≧ reference number”). Send the response using the multicast transmission method.
[0083]
In the case of FIG. 1, in the first response transmission, the multicast group # 1 is designated and the response is transmitted by the multicast transmission method. Naturally, since the optical network unit can only receive responses sent to the multicast group to which the optical network unit belongs, each optical network unit confirms the multicast group number and belongs to itself. Capture only multicast group configuration data.
[0084]
Accordingly, the response transmitted first is captured by the optical network unit #x and the optical network unit #y, but is not captured by the optical network unit #z because the multicast group number is different.
[0085]
Since all responses have not been sent, the router interface compares the number of responses again with the number of transmission mode criteria, and if it is determined that the number of responses is less than the number of criteria for transmission mode, sends a unicast response. Send by method.
[0086]
Since the second response is transmitted by designating the highway # 1 and the optical network unit #z, only the optical network unit #z takes in the response. According to the setting in FIG. 1, since the optical network unit #x and the optical network unit #y are connected to the highway # 0, the second response is the optical network unit #x and the optical network unit #. It is not delivered to y.
[0087]
As described above, the router interface to which the present invention is applied compares the number of responses stored in the transmission buffer with the transmission form determination reference number prior to transmission of the response, and the number of responses indicates the transmission form determination reference number. If it is determined that the response is exceeded, the response is transmitted by the multicast transmission method, and if it is determined that the number of responses is equal to or less than the transmission mode determination reference number, the response is transmitted by the unicast transmission method.
[0088]
Therefore, when there are a large number of responses to be transmitted, that is, when there are a large number of optical network units that need to receive responses, setting data can be transmitted to many optical network units by one multicast transmission. The transmission load on the router interface can be reduced, and a decrease in transmission efficiency on the highway can be avoided.
[0089]
In addition, when the number of responses to be transmitted is small, the setting data is transmitted by the unicast transmission method. Therefore, the router interface performs a process of collecting responses addressed to the optical network units belonging to the same multicast group in order to perform multicast transmission. This eliminates the need to reduce the load on the router interface. In this case, since the number of responses to be transmitted is small, there is little possibility that the highway is occupied for response transmission.
[0090]
Hereinafter, the technique of the present invention will be described in detail.
[0091]
FIG. 2 shows a response structure.
[0092]
That is, the response includes a highway number part, a destination multicast group number part, a destination optical network unit number part, a transmission data type part, and a setting data part.
[0093]
Since the response can be transmitted by either the multicast transmission method or the unicast transmission method, the number of the optical network unit that has transmitted the setting command is displayed in the destination optical network unit number portion, and Stores the highway number in which the optical network unit is accommodated, the multicast group number to which the optical network unit belongs in the destination multicast group number section, and information indicating that it is a response in the transmission data type section In the setting data section, setting data required by the optical network unit is loaded and a response is created.
[0094]
The response created as described above is temporarily stored in a transmission buffer provided in the router interface.
[0095]
FIG. 3 shows the structure of the response registered in the transmission buffer.
[0096]
In the transmission buffer, it is necessary to grasp and manage whether each stored response has been sent or not sent and is waiting to be sent, so a data code indicating sent / not sent is added to the response of the above configuration. There is a need to. An area to which the data code is added is a data code portion. For example, if “1” is set, it indicates an untransmitted state, and if “0” is set, it indicates that transmission has been completed. Even when the data code is erased, the data code is “0”, but there is no problem in management. If it is necessary to distinguish between the transmitted state and the erased state, the data code may be 2 bits.
[0097]
A plurality of responses are stored with a data code added in the transmission buffer. Therefore, it is necessary to create a response management table in order to grasp the storage status of responses in the transmission buffer.
[0098]
FIG. 4 shows the configuration of the response management table.
[0099]
In FIG. 4, the number of responses stored in the transmission buffer in an untransmitted state is set in the buffer residual response number section.
[0100]
In the transmission form determination reference number section, a transmission form determination reference number that is a determination reference for selecting a multicast transmission method or a unicast transmission method is set. The multicast transmission method is selected if the number of remaining responses is equal to or greater than the number of transmission mode judgment criteria set here, and the unicast transmission method is selected if the number of remaining responses is less than the number of transmission mode judgment criteria. .
[0101]
Note that the transmission mode judgment reference number is set according to the number of multicast groups supported in the router interface. This will be described later with reference to FIG.
[0102]
Information indicating the currently selected transmission mode, that is, the multicast transmission mode or the unicast transmission mode is set in the transmission mode type section. For example, if “1” is set, it indicates that the multicast transmission method is selected, and if “0” is set, it indicates that the unicast transmission method is selected.
[0103]
In the response group start address part, the start address (start address) in the transmission buffer in which a group of responses to be transmitted at the time of multicast transmission (this is a “response group”) is stored. Is set.
[0104]
In the response group end address section, a final address (end address) in the transmission buffer of the response group transmitted in the group at the time of multicast transmission is set.
[0105]
As described above, by setting the start address and the end address, it becomes possible to perform multicast transmission by skipping the area that has become an empty response as a result of the response transmitted by the multicast transmission method.
[0106]
In the response group total remaining response number section, the number of untransmitted responses in the response group targeted for multicast transmission is stored.
[0107]
Information related to each response to be transmitted by multicast is stored in the management data section for each multicast group on the transmission side. The term “transmitting side” is used in the sense of “related to each response to be sent by multicast transmission”.
[0108]
The management data for each response stored after it is determined that multicast transmission is stored in the management data section for each multicast group on the receiving side. “Receiving side” means “relating to each response created and stored by receiving a setting command after determining multicast transmission”.
[0109]
The configurations of the transmission-side multicast / group-specific management data section and the reception-side multicast / group-specific management data section will be described later with reference to FIG.
[0110]
FIG. 5 shows the configuration of the transmission form determination reference number part in the response management table of FIG.
[0111]
As shown in FIG. 5, the transmission form determination reference number section is set with a transmission form determination reference number corresponding to the number of multicast groups constituting the information transmission system of FIG. A valid flag indicating a valid value is added. The validity flag may be, for example, “1” to indicate validity and “0” to indicate invalidity (however, in the figure, it is expressed by − and black circles for visual clarity).
[0112]
In the example of FIG. 5, it is shown that the transmission form determination reference number 5 corresponding to the number of multicast groups 3 constituting the information transmission system of FIG. 22 is the currently effective transmission form determination reference number.
[0113]
Here, although the method of setting the transmission mode judgment reference number with respect to the number of multicast groups constituting the information transmission system of FIG. 22 is largely dependent on experience, the system in which the user of the information transmission system operates itself It may be set freely corresponding to the configuration of.
[0114]
FIG. 6 shows the configuration of the management data section for each multicast group and the address management section.
[0115]
Here, as many address management units as the number of optical network units are secured in a free memory area.
[0116]
In the response management table, the management data part for each sending multicast group is distinguished from the management data part for each receiving multicast group, but the structure is the same only by distinguishing depending on the timing when the response is created. -Explain in a unified manner as a group-specific management data section.
[0117]
First, the management data section for each multicast group is configured as follows.
[0118]
That is, the status part indicates whether it is a transmission side or a reception side. For example, if “1” is set, it may be determined that it is the transmitting side, and if “0” is set, it is determined that it is the receiving side.
[0119]
The number of multicast groups with a response stores the number of multicast groups with a response to be transmitted.
[0120]
In the multicast group number section, the numbers of multicast groups constituting the information transmission system are described.
[0121]
The response number section describes the number of responses to be transmitted for each multicast group.
[0122]
In the highway number part, all highway numbers that accommodate optical network units belonging to the multicast group of the multicast group number are set.
[0123]
The head address of the address management unit that stores the address of the response addressed to the multicast group of the multicast group number is stored in the head address portion of the address management unit.
[0124]
That is, after the first address HxXXX in the address management unit, an address in which a response belonging to the multicast group number # 1 is stored in the transmission buffer is stored.
[0125]
FIG. 7 shows the contents of the transmission buffer in the response transmission method of the present invention.
[0126]
In FIG. 7, (a) to (f) are outlines of the contents of the transmission buffer at each timing, and what is described above the contents of each transmission buffer is simply a response management table at the timing (in the figure, The main contents of “Management table” are omitted), and the management data section for each receiving multicast group is omitted.
[0127]
In addition, a double line unit rectangle is a response waiting for transmission, and a thick broken line unit rectangle is a new response created after setting a response group for multicast transmission, and a solid thick unit rectangle is set. Responses already sent by multicast in the response group, thin solid line, rectangles in units where multicast group numbers are not described as in FIG. 17 indicate empty responses that have been erased after all response groups have been sent. The entire vertically long rectangle obtained by stacking these unit rectangles indicates the storage area or stored contents of the transmission buffer.
[0128]
The data code on the left shoulder of each unit rectangle indicates that it has not been transmitted / transmitted, and the right side and the lower side of the data code are thin solid lines that are not transmitted. A thick solid line on the right side and the lower side of the data code indicates that transmission has been completed.
[0129]
Furthermore, the multicast group number is described outside the data code frame in the unit rectangle.
[0130]
In the transmission buffer at the time of FIG. 7 (a), 10 responses are stored waiting to be transmitted, and the 10 responses form a response group for multicast transmission, and are related to the response group. The numbers of multicast groups to be performed are # 1, # 2 and # 3.
[0131]
Therefore, 10 is stored in the remaining response number portion in the buffer of the response management table, 10 is also stored in the remaining response number portion of the total response group, and the multicast group management data portion includes a multicast group. It is stored that there are 3 responses addressed to # 1, 2 responses addressed to multicast group # 2, and 5 responses addressed to multicast group # 3.
[0132]
Then, according to the configuration example of the transmission form determination reference number section of FIG. 5, the number of types of multicast groups is 3, and in this case, the number of transmission form determination references is specified as 5. In FIG. 7 (a), the number of remaining responses is 10, which is larger than the transmission mode judgment reference number 5. In this case, multicast transmission is selected.
[0133]
The address of the area where the highest response in FIG. 7 (a) is stored is the multicast transmission start address (decimal address 0), and the area where the 10th response is stored in FIG. 7 (a). Is the end address of multicast transmission (address 9 in decimal). The start address and end address are not changed until all responses in the response group formed here are deleted after being transmitted.
[0134]
At the time of FIG. 7 (b), multicast transmission of the response group assembled in FIG. 7 (a) is performed. Since the first response of the response group is a response related to multicast group # 1, first, A response related to the multicast group # 1 is transmitted by multicast.
[0135]
As a result, the transmission buffer at the time of FIG. 7 (b) stores the seven responses remaining after the transmission of three responses addressed to multicast group # 1, and the two newly added responses. Yes.
[0136]
Therefore, 10−3 + 2 = 9 is stored in the remaining response number portion of the response management table, and 10−3 = 7 is stored in the remaining response number portion of the total response group, and the management data portion by transmission side multicast group Is stored that there are 0 responses addressed to the multicast group # 1, 2 responses addressed to the multicast group # 2, and 5 responses addressed to the multicast group # 3.
[0137]
Although not shown in FIG. 7, in the management data section for each receiving multicast group in the response management table, there is one response addressed to multicast group # 1 and one response addressed to multicast group # 2. It is described that there is 0 response and 1 response addressed to multicast group # 3.
[0138]
Since the number of remaining responses is 9, multicast is selected as the transmission method at the next time point.
[0139]
At the time of FIG. 7C, since the response with the smallest address among the responses waiting for transmission is the response addressed to multicast group # 3, the response addressed to multicast group number # 3 is multicast.
[0140]
Similarly, when multicast transmission is performed and FIG. 7 (d) is reached, all 10 responses in the response group stored in the transmission buffer at the time of FIG. 7 (a) are multicast transmitted. (C) There are five responses that have been added and are waiting to be transmitted, and two responses are newly added at the time of FIG.
[0141]
Therefore, 5 + 2 = 7 is stored in the remaining response number part of the response management table, 10-10 = 0 is stored in the remaining response number part of the total response group, and the management data part by transmission side multicast group is stored in the management data part. , 0 response to the multicast group # 1, 0 response to the multicast group # 2, and 0 response to the multicast group # 3 are stored.
[0142]
At the time of FIG. 7 (e), the response group formed with the first 10 responses is deleted and becomes an empty response. At this time, since the number of multicast groups with a response is 3 in the management data section for each receiving multicast group, the corresponding flag is set at the reference number 5 from FIG. 5, and the remaining response at this point Since the number is seven, the multicast transmission method is selected for the next transmission because the number exceeds the reference number.
[0143]
At the time of FIG. 7 (d), the status of the management data part by receiving side multicast group is set to transmission, the status of the management data part by sending side multicast group is set to reception, and the response that has not been sent The newly added response is used as a transmission wait response. At this point, there are seven transmission-waiting responses, a response group for multicast transmission is formed with these seven transmission-waiting responses, three responses addressed to multicast group # 1, and responses addressed to multicast group # 2 There are two responses to the multicast group # 3.
[0144]
Therefore, 7 is stored in the remaining response number part of the response management table, 7 is also stored in the remaining response number part of the total response group, and multicast group # 1 is stored in the management data part by transmission side multicast group. It is stored that there are three responses addressed, two responses addressed to multicast group # 2, and two responses addressed to multicast group # 3.
[0145]
It is not until this point that the address of the area storing the response immediately below the upper empty response in FIG. 7 (e) is the multicast transmission start address (decimal address is 10). The address of the area in which the seventh transmission waiting response is stored becomes the multicast transmission end address (decimal address 16), and the start address and end address of the response group for multicast transmission are updated. The
[0146]
Thereafter, the transmission of the response is continued in the same procedure as described above. When the number of remaining responses is equal to or less than the transmission mode judgment reference number, the transmission method is changed to unicast, and the response is transmitted.
[0147]
FIG. 8 is a setting example of the response management table. Since the outline of the setting contents of the response management table is described in the explanation with reference to FIG. 7, I think that I have almost understood it, but more detailed setting contents are described. In addition, what is shown in FIG. 8 is consistent with the state of FIG.
[0148]
At the time of FIG. 7 (a), responses from address 0 to address 9 of the transmission buffer are incorporated in the response group, three responses addressed to multicast group # 1, and responses addressed to multicast group # 2 2 and 5 responses addressed to the multicast group # 3 are stored as transmission waiting responses.
[0149]
Therefore, 10 is stored in the buffer residual response number part, 5 in the transmission form determination reference number part with reference to FIG. 5, “multicast” in the transmission form type part, and 0 in the start address. However, decimal 9 is stored in the end address part, and 10 is stored in the remaining response number part of the total response group.
[0150]
Then, it is stored in the transmission-side multicast group management data section as follows.
[0151]
That is, “Sender” in the status part, 3 in the multicast group number part with a response, 3 in the response number part of the multicast group number # 1, and 3 in the response number part of the multicast group # 2 2 is stored, and 5 is stored in the response number part of the multicast group # 3. In the highway number, referring to FIG. 6, it is assumed that 0, 2, 1, 3, and 7 are stored for each multicast group number.
[0152]
Next, the data is stored in the receiving-side multicast group management data portion as follows.
[0153]
That is, the status part is “reception side”, and the multicast group number part with a response has no response stored in the transmission buffer after the response group is assembled, so 0 is the multicast group number # 1. 0 is stored in the response number part, 0 is stored in the response number part of multicast group # 2, and 0 is stored in the response number part of multicast group # 3. Note that nothing is stored in the highway number because there is no response to be transmitted.
[0154]
This completes the description of the response, response management table configuration, and response storage in the transmission buffer required for the present invention. After that, response creation, response management table update during response creation, response transmission The process performed in will be described with reference to a flowchart.
[0155]
Note that the program that creates the response, registers the response in the send buffer and updates the response management table, and the program that sends the response operate independently, and the program that sends the response stores the contents of the response management table. Execute the transmission operation.
[0156]
FIG. 9 is a flowchart for creating a response.
[0157]
S1. The router interface is waiting to receive a setting command from the optical network unit, and determines whether or not a setting command has been received from the optical network unit.
[0158]
When it is determined that the setting command has not been received from the optical network unit (No), the process returns to the beginning (step S1).
[0159]
S2. If it is determined in step S1 that a setting command has been received from the optical network unit (Yes), the setting contents from the operation system or the initial conditions set in advance in the router interface itself are used. The response setting data part is created, and the optical network unit number requesting the response with reference to the received setting command, the highway number in which the optical network unit is accommodated, and the optical network unit belong Add a multicast group number.
[0160]
S3. Information indicating that it is a response is set in the transmission data type part of the response to complete the response.
[0161]
S4. In order to register the revised response in the transmission buffer, a data code part is added at the head, and information indicating that it is in an untransmitted state is set.
[0162]
S5. Register the response with the data code added to the send buffer.
[0163]
S6. Since one response is registered in the transmission buffer corresponding to the setting command, 1 is added to the number stored in the remaining response number section of the response management table.
[0164]
S7. In subsequent response management table updates, processing differs between multicast transmission and unicast transmission, so it is determined whether multicast transmission is in progress. This can be done by checking whether the transmission form type in the response management table indicates multicast or unicast.
[0165]
If the transmission type is multicast (Yes), the response management table is updated at the time of multicast. If the transmission type is unicast (Yes), the response management table is updated at the time of unicast. Then, return to step S1.
[0166]
FIG. 10 is a flowchart of response management table update at the time of multicast transmission.
[0167]
S11. Since the response is newly created and registered during the multicast transmission, the response is incorporated into a response group to be transmitted next. Accordingly, referring to the multicast group number in the response, the number of responses stored in the multicast group number of the management data part for each receiving multicast group is increased by one.
[0168]
S12. In step S11, it is determined whether or not the response is the first response of the multicast group in which the number of responses has been increased in the management data unit by multicast group on the receiving side. This may be determined by determining whether the number of responses stored in the multicast group number corresponding to the multicast group is 1 or 2 or more.
[0169]
S13. In step S12, if it is determined that the response is the first response of the multicast group in which the number of responses has been increased in the management data section for the receiving multicast group (Yes), a response addressed to the new multicast group is registered. Therefore, the number stored in the number of multicast groups with a response of the management data part for each receiving multicast group is increased by one.
[0170]
S14. In order to form an address management unit, as many storage areas as the number of optical network units are secured in a free memory area.
[0171]
S15. The secured start address of the address management section is stored in the start address section of the management address management section for each multicast group number of the management data section for each receiving multicast group.
[0172]
S16. Then, the address management unit stores the address of the transmission buffer that stores the response.
[0173]
S17. The highway number of the response is registered in the highway number part managed for each multicast group number in the management data part for each receiving multicast group, and the process jumps to S1 in the flowchart of FIG.
[0174]
S18. On the other hand, if it is determined in step S12 that it is not the first response of the multicast group in which the number of responses has been increased in the receiving multicast group management data part (No), the response is stored in the address management part. Stores the address of the transmission buffer.
[0175]
S19. It is determined whether the highway number of the response is registered in the highway number part managed for each multicast group number in the receiving side management data part.
[0176]
When it is determined that the highway number of the response is registered in the highway number part managed for each multicast group number in the reception side management data part (Yes), the process jumps to S1 in the flowchart of FIG. .
[0177]
S20. If it is determined in step 19 that the highway number of the response is not registered in the highway number part managed for each multicast group number of the receiving side management data part (No), the highway number of the response Is registered in the highway number part managed for each multicast group number of the management data part for each receiving multicast group, and the process jumps to S1 in the flowchart of FIG.
[0178]
FIG. 11 is a flowchart of response management table update at the time of unicast transmission.
[0179]
S31. This is the time when a new response was created and registered during unicast transmission. By the way, at the time of unicast transmission, since a response is not transmitted for each response group, only the transmission side is effective for the management data section for each multicast group. Therefore, referring to the multicast group number in the response, the number of responses stored in the multicast group number in the management data section for each multicast group on the transmission side is increased by one.
[0180]
S32. In step S31, it is determined whether or not the response is the first response of the multicast group in which the number of responses is increased in the transmission-side multicast group management data section. This may be determined by determining whether the number of responses stored in the multicast group number corresponding to the multicast group is 1 or 2 or more.
[0181]
S33. In step S32, if it is determined that the response is the first response of the multicast group in which the number of responses has been increased in the management data section by transmission side multicast group (Yes), a response addressed to the new multicast group is registered. Therefore, the number stored in the number of multicast groups with a response of the management data part for each multicast group on the transmission side is increased by one.
[0182]
S34. In order to form an address management unit, as many storage areas as the number of optical network units are secured in a free memory area.
[0183]
S35. The secured start address of the address management section is stored in the start address section of the management address management section for each multicast group number in the management data section for each multicast group on the transmission side.
[0184]
S36. Then, the address management unit stores the address of the transmission buffer that stores the response.
[0185]
S37. The highway number of the response is registered in the highway number part managed for each multicast group number of the management data part for each multicast group on the transmission side.
[0186]
S38. Referring to the number stored in the multicast group number part with the response of the management data part by sending side multicast group, move to the number that stores the corresponding flag in the transmission form judgment reference number part. Then, the process jumps to step S1 in FIG.
[0187]
S39. On the other hand, if it is determined in step S32 that the response is not the first response of the multicast group in which the number of responses is increased in the management data unit by multicast group on the transmission side (No), the response is stored in the address management unit. Stores the address of the transmission buffer.
[0188]
S40. It is determined whether the highway number of the response is registered in the highway number part managed for each multicast group number in the receiving side management data part.
[0189]
When it is determined that the highway number of the response is registered in the highway number part managed for each multicast group number in the reception side management data part (Yes), the process jumps to S1 in the flowchart of FIG. .
[0190]
S41. If it is determined in step 39 that the highway number of the response is not registered in the highway number part managed for each multicast group number of the transmission side management data part (No), the highway number of the response Is registered in the highway number part managed for each multicast group number in the management data part by transmission side multicast group, and the process jumps to S1 in the flowchart of FIG.
[0191]
As described above, response creation and response management table update processing are performed in an infinite loop.
[0192]
Next, a response transmission process will be described.
[0193]
FIG. 12 is a flowchart of response transmission.
[0194]
S51. It is determined whether or not the number of remaining responses in the response management table is equal to or greater than the transmission mode determination reference number.
[0195]
S52. If it is determined in step S51 that the number of remaining responses in the response management table is equal to or greater than the transmission mode determination reference number (Yes), it is necessary to perform multicast transmission, and the transmission type must be set to multicast. Therefore, it is determined whether or not information indicating multicast transmission is set in the transmission type part of the response management table.
[0196]
S53. If it is determined in step S52 that the transmission type is set to multicast (Yes), the status of the management data part for each receiving multicast group in the response management table is updated to the transmitting side, and the response Update the status of the management data part for each multicast group in the management table to the receiving side.
[0197]
If this is set to be multicast transmission, the information on the response to be newly transmitted is stored in the management data section for each receiving multicast group, and the previous management for each multicast group is controlled. Since the response corresponding to the data has already been transmitted, this processing is performed to change the status of the management data section for each multicast group.
[0198]
Then, the process proceeds to a response multicast transmission routine, and when the multicast transmission routine ends, the process proceeds to step S54.
[0199]
S54. When the multicast transmission is finished, all the responses related to the information stored in the transmission-side multicast / group-specific management data part have already been transmitted. Stored in the group-specific management data section.
[0200]
Accordingly, referring to the number stored in the multicast group number part with a response of the management data part by receiving side multicast group, the position of the flag in the transmission form judgment reference number part is updated, and the process jumps to step S51. To do.
[0201]
S55. Since the transmission form type of the response management table is unicast, it is set to multicast.
[0202]
S56. On the other hand, if it is determined in step S51 that the number of remaining responses in the response management table is less than the transmission mode determination reference number (No), it is determined whether there is a response to be transmitted.
[0203]
If it is determined that there is no response to be transmitted (No), the process jumps to step S51.
[0204]
S57. If it is determined in step S56 that there is a response to be transmitted (Yes), it is determined whether or not information indicating unicast transmission is stored in the transmission type portion of the response management table.
[0205]
If the information indicating that the transmission is unicast is stored (Yes), the routine proceeds to a routine for performing response transmission by unicast, and jumps to step S51 when the unicast transmission is completed.
[0206]
S58. On the other hand, if information indicating that multicast transmission is stored in the transmission type part of the response management table in step S57 (No), information indicating unicast transmission is stored in the transmission type part of the response management table. Store again.
[0207]
S59. The status of the management data part for each receiving multicast group in the response management table is updated to the transmitting side, and the status of the management data part for each sending multicast group in the response management table is updated to the receiving side.
[0208]
Here, the setting of multicast transmission when it is determined that unicast transmission should be performed means that the transmission is changed to unicast transmission after multicast transmission.
[0209]
Therefore, since the information on the response to be newly transmitted is stored in the management data section for each receiving multicast group, the response corresponding to the management data for each transmitting multicast group is already transmitted. This process is performed because it is necessary to change the status of the group-specific management data section.
[0210]
Then, the process proceeds to a response unicast transmission routine, and when the unicast transmission routine ends, the process proceeds to step S51.
[0211]
As described above, the response transmission process is performed in an infinite loop. Hereinafter, processing of multicast transmission and unicast transmission in an infinite loop will be described.
[0212]
FIG. 13 is a flowchart when the response is multicast.
[0213]
S61. The total number of responses in the management data part for each multicast group in the response management table is stored in the number of remaining responses in the response group total in the response management table.
[0214]
S62. Of the responses waiting for transmission stored in the transmission buffer, the address of the oldest response is stored in the start address portion of the response management table as the start address.
[0215]
S63. Of the responses stored in the transmission buffer, the address of the newest response is stored in the end address portion of the response management table as the end address.
[0216]
The range of the response that forms the response group is defined by the processing of step S62 and step S63.
[0217]
S64. It is determined whether there is another response of the multicast group including the oldest response among the transmission waiting responses stored in the transmission buffer.
[0218]
S65. If it is determined in step S64 that there is another response of the multicast group that contains the oldest response stored in the transmission buffer (Yes), the transmission destination of the response Is set to the highway number registered in the highway number part corresponding to the corresponding multicast group number in the management data part by multicast group on the transmission side, and “ALL” is set as the optical network unit number of the response transmission destination. Set a number that means "".
[0219]
S66. A response defined by the same multicast group is sent to the destination highway, and multicast transmission is performed to all optical network units connected to the highway, and the process proceeds to step S68.
[0220]
S67. On the other hand, when it is determined in step S64 that there is no other response of the multicast group including the oldest response stored in the transmission buffer (No), the response Only unicast transmission is performed, and the process proceeds to step S68.
[0221]
S68. The data code of the response transmitted in step S66 or step S67 is updated to information indicating transmission completion.
[0222]
S69. The number of responses transmitted in step S66 or step S67 is subtracted from the number stored in the remaining response number part of the response management table and the remaining response number part of the total response group.
[0223]
S70. The number of transmitted responses is subtracted from the number of responses registered for each multicast group in the transmission-side multicast group management data section in the response management table.
[0224]
S71. The highway number registered for each multicast group in the management data section for each multicast group in the response management table is deleted.
[0225]
S72. Delete the response address of the transmitted multicast group stored in the address management unit.
[0226]
S73. Returns the address management unit managed for each multicast group number in the management data unit for each multicast group on the transmission side.
[0227]
S74. The head address of the address management unit managed for each multicast group number in the management data unit for each multicast group on the transmission side is deleted.
[0228]
S75. It is determined whether or not the total number of remaining responses in the response group is 0, that is, whether all responses in the response group have been transmitted.
[0229]
If the number of remaining responses in the response group total is not 0, that is, if it is determined that there is an untransmitted response (No), the process jumps to step S64.
[0230]
S76. If it is determined in step S75 that the total number of remaining responses in the response group is 0, that is, there is no untransmitted response (Yes), the start stored in the start address portion of the response management table The address and the response within the range specified by the end address stored in the end address part are deleted, and the process jumps to step S51 in the flowchart of FIG.
[0231]
FIG. 14 is a flowchart when a response is unicast transmitted.
[0232]
S81. The oldest response in the transmission waiting response stored in the transmission buffer is unicasted.
[0233]
S82. Update the data code of the sent response to sent.
[0234]
S83. 1 is subtracted from the number stored in the number of remaining responses in the response management table.
[0235]
S84. 1 is subtracted from the number of responses managed for each multicast group number in the management data section for each multicast group on the transmission side in the response management table.
[0236]
S85. It is determined whether there is no response defined in the same multicast group in the transmission waiting response.
[0237]
S86. If it is determined in step S85 that there is no response defined in the same multicast group among the responses waiting for transmission (Yes), the response is managed for each multicast group number in the management data part for each multicast group on the transmission side. The highway number that is currently being deleted is deleted.
[0238]
S87. Delete the sent response from the send buffer.
[0239]
S88. Deletes the response address stored in the address manager.
[0240]
S89. Returns the address management unit managed for each multicast group number in the management data unit for each multicast group on the sending side.
[0241]
S90. The head address of the address management unit managed for each multicast group number in the management data unit for each multicast group on the transmission side is deleted.
[0242]
S91. 1 is subtracted from the number stored in the multicast group number part with the response of the management data part by multicast group on the transmission side.
[0243]
S92. The flag of the transmission form determination reference number part of the response management table is updated to the number of multicast groups obtained by subtracting 1, and the process jumps to step S51 in FIG.
[0244]
S93. On the other hand, if it is determined in step S85 that there is a response defined in the same multicast group in the transmission waiting response (No), whether or not there is a response with the same highway number in the transmission waiting response. judge.
[0245]
If it is determined that there is a response with the same highway number in the transmission waiting response (No), the process jumps to step S95.
[0246]
S94. On the other hand, if it is determined in step 93 that there is no response of the same highway number among the responses waiting for transmission (Yes), the management data unit is managed for each number of multicast groups in the management data unit for each multicast group on the transmission side. Delete only the highway number of the response sent from the existing highway number. The process proceeds to step S95.
[0247]
S95. Delete the sent response from the send buffer.
[0248]
S96. The address of the transmitted response stored in the address management unit is deleted, and the process jumps to step S51 in FIG.
[0249]
The response transmission method in the optical subscriber transmission system taking the passive double star system as an example has been described above. This is because, as described at the beginning, there are a plurality of systems that require similar functions, and the configuration itself is usually different. Because. Therefore, the technology of the present invention is not limited to a passive double star system. I would like to add a note about this point.
[0250]
As described at the beginning, there is a supervisory control system in a system having a function similar to that of a passive double star system, and even in the supervisory control system, a plurality of supervisory terminals request initial setup from a single supervisory control station. The monitoring control station transmits a response to the monitoring terminal. Looking at both systems in a unified manner, the optical subscriber line terminator in the passive double star system and the supervisory control station in the supervisory control system can be defined as the “parent device”. The monitoring terminal in the network unit and the monitoring control system can be defined as a “child device”.
[0251]
Moreover, the form of a network composed of a parent device and a plurality of child devices is not limited to a star type such as a passive double star system, there is a bus type network, and there is also a loop or ring type network. . When the network forms are different in this way, there is a difference in the way of sending the setting command and the way of sending the response, that is, the way of composing the communication frame.
[0252]
However, it is the same that it is necessary to reduce the load of response creation and response transmission to the setting command and to avoid a decrease in network transmission efficiency. The technique of the present invention can be applied regardless of the network form.
[0253]
Furthermore, in both the subscriber line optical transmission system and the supervisory control system, the parent device is often configured in a redundant configuration, but even in this case, the system is practically operated by a single parent device and a plurality of child devices. are doing. Therefore, the technique of the present invention can be applied to a system in which the parent device has a redundant configuration.
[0254]
Therefore, for example, in the means for solving the problem, described as "first invention""when the number of responses to the setting commands from a plurality of optical network units exceeds the number of transmission form determination criteria, The optical subscriber line terminating device transmits a response by the multicast transmission method, and when the number of responses is equal to or less than the transmission form determination reference number, the technology for transmitting the response by the unicast transmission method is generally “ When the number of responses to setting commands from a plurality of child devices exceeds the transmission mode judgment reference number, the parent device transmits the response by the multicast transmission method, and the number of responses is equal to or less than the transmission type judgment reference number. In this case, it can be rewritten as “a technique for transmitting a response by a unicast transmission method”. The same applies to other inventions.
[0255]
【The invention's effect】
According to the first invention, the number of response transmissions performed by the parent device can be reduced, the load for response transmission can be reduced, and the transmission efficiency of the highway used for response transmission is reduced. Can be avoided.
[0256]
Also, since the setting data is transmitted by the unicast transmission method when the number of responses to be transmitted is small, it is not necessary to perform the process of collecting responses addressed to the child devices belonging to the same multicast group every time multicast transmission is performed. Can reduce the load.
[0257]
According to the second invention, it is possible to flexibly select a response transmission form according to the scale of the system.
[0258]
According to the third aspect of the invention, it is possible to independently execute response creation and storage processing and transmission processing in the parent device during multicast transmission.
[0259]
According to the fourth aspect of the invention, the number of times the highway is occupied for response transmission is reduced, and the transmission efficiency can be increased.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a response transmission method according to the present invention.
FIG. 2 Response configuration.
FIG. 3 shows the structure of a response registered in the transmission buffer.
FIG. 4 shows the structure of a response management table.
FIG. 5 shows a configuration of a transmission form determination reference number part.
FIG. 6 shows a configuration of a management data unit by MCG and an address management unit.
FIG. 7 shows the contents of a transmission buffer in the response transmission system of the present invention.
FIG. 8 is a setting example of a response management table.
FIG. 9 is a flowchart for creating a response.
FIG. 10 is a flowchart of response management table update at the time of multicast transmission.
FIG. 11 is a flowchart of response management table update at the time of unicast transmission.
FIG. 12 is a flowchart of response transmission.
FIG. 13 is a flowchart for multicast transmission of responses.
FIG. 14 is a flowchart when a response is unicast transmitted.
FIG. 15 is a schematic diagram of a response flow in the unicast transmission method.
FIG. 16 is a diagram for explaining a conventional response transmission method (part 1);
FIG. 17 shows a response to be transmitted during unicast transmission.
FIG. 18 shows the contents of a transmission buffer in a conventional response transmission method.
FIG. 19 is a schematic diagram of a response flow in the multicast transmission method.
FIG. 20 is a diagram for explaining a conventional response transmission method (part 2);
FIG. 21 shows a response to be transmitted at the time of multicast transmission.
FIG. 22 shows an outline of the configuration of an information transmission system to which a passive double star system is applied.
[Explanation of symbols]
1 Operation System (OpS)
2 Optical subscriber line termination equipment (OLT)
21 Operation System Interface (OpS-IF)
22 Router interface (Router IF)
23 Formatter (FMT)
24-1 Optical Subscriber Unit (OSU)
24-2 Optical subscriber unit (OSU)
3-1 Star coupler
3-2 Star coupler
4-1 Optical network unit (ONU)
4-2 Optical Network Unit (ONU)
4-3 Optical Network Unit (ONU)
4-4 Optical Network Unit (ONU)
5-1 Hub
5-2 Hub
6-1 Personal computer (PC)
6-2 Personal computer (PC)
7-1 Telephone
7-2 Telephone
8-1 Television and video tape recorder (TV)
8-2 Television and video tape recorder (TV)
9 Router
10 Internet
11 Provider host

Claims (4)

If the number of responses to a command requesting initial value setting from a plurality of child devices exceeds the number of transmission method judgment criteria that is a criterion for selecting either multicast transmission or unicast transmission, the parent device Sends a response using the multicast transmission method,
When the number of responses is equal to or less than the transmission method determination reference number, the response is transmitted by the unicast transmission method. The response transmission method according to claim 1,
A response transmission system characterized in that the transmission system judgment reference number can be set according to the number of multicast groups supported by the parent apparatus. The response transmission method according to claim 1,
A response transmission method characterized in that a management table for managing a response storage state and transmission form in a transmission buffer in the parent device is managed for each transmission form and for each multicast group. In the response transmission method according to claim 1 or 2,
A plurality of responses stored in the transmission buffer are divided into a single group when it is determined that multicast transmission is to be performed, and a response of the same multicast group is searched in the group and multicast transmission is performed. Response sending method.

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