KR100875029B1 - Bandwidth Allocation Method by Service for WDM Ethernet Passive Optical Network - Google Patents

Abstract

The present invention provides a bandwidth using multiple wavelengths for each optical termination device in an optical line termination (OLT) connected to a plurality of optical network units (ONUs) in a wavelength-multiplexed Ethernet passive optical network. The present invention relates to a method for allocating bandwidth for each service of a wavelength-divided Ethernet passive optical network to be allocated. By implementing the fixed bandwidth and the dynamic variable bandwidth according to the service type at the same time, it is possible to improve the optical media access function and transmission delay time in the optical subscriber line section, and to provide efficient service and operation management.

Description

Method for allocating bandwidth classified by service in wavelength division multiplexing ethernet passive optical network}

1 is a structural diagram of a typical Ethernet passive optical network.

2 is a schematic diagram of bandwidth allocation of a WDM Ethernet passive optical network in accordance with the present invention.

3 is a flowchart of a method in which an optical fiber terminating device allocates a variable bandwidth of an optical fiber terminating device in accordance with the present invention;

4A and 4B are flowcharts of a method for assigning a wavelength for each service to a fiber termination device by an optical fiber termination device according to the present invention;

The present invention relates to a bandwidth allocation method for each service of a wavelength-division Ethernet passive optical network, and more particularly, to an optical fiber termination unit (ONU) connected to a plurality of optical network units (ONU) in a wavelength-division Ethernet passive optical network. OLT (Optical Line Teminal) relates to a service-specific bandwidth allocation method of a wavelength multiplexing Ethernet passive optical network that allocates bandwidth to each optical termination device using multiple wavelengths.

Ethernet passive optical networks transmit data using Ethernet frames at Layer 2, based on 1Gbps native fiber speed.

The structure of the Ethernet passive optical network is defined as a structure in which one optical fiber terminator 20 and several optical network terminators 10 are located at both ends of the passive optical splitter 30, as shown in FIG.

The optical fiber terminating device 20 performs the optical fiber terminating function and the multi converging function as an exchange facility on the main network side, and the optical fiber terminating device 10 performs the optical fiber terminating function and the multi converging function on the subscriber side.

In addition, the optical fiber terminating device 20 functions to allocate the bandwidth required by the optical fiber terminating device 10, and the optical fiber terminating device 10 requires the bandwidth necessary for the optical fiber terminating device 20.

Passive optical splitter 30 has the advantage of low installation and maintenance cost when configuring the Ethernet passive optical network because it is a passive device that does not require power supply, and a single optical signal according to the optical signal transmission direction of several optical Distributes into signals or combines multiple optical signals into a single optical signal.

In general, the Ethernet passive optical network, in the data transfer, the downstream stream from the optical fiber terminator 20 to the optical fiber terminator 10 is transmitted point-to-multipoint without control of the media access, the optical fiber terminator 10 in the optical fiber terminator Since the upstream to device 20 accesses the media on a multi-point basis, a protocol for media access is required.

The technology proposed for Media Access Control (MAC) of Ethernet passive optical network is as follows.

The media access control protocol of the Ethernet passive optical network is a fixed bandwidth allocation scheme for quality of service services that require guaranteed bandwidth, such as leased lines, and a dynamic variable bandwidth allocation scheme for local area networks (LANs) and metropolitan area networks (MANs). Are classified in a manner.

The fixed bandwidth allocation scheme for leased line subscribers allocates time slots corresponding to the contracted bandwidth regardless of whether the allocated bandwidth is used by provisioning.

This method has a problem in that it does not utilize the allocated bandwidth efficiently.

Dynamic variable bandwidth allocation scheme suitable for best-in-class services such as LAN / MAN requires the corresponding bandwidth to the fiber terminator to transmit frames arriving at the buffer of the fiber terminator, and the fiber terminator is required by the fiber terminator. Bandwidth is allowed through scheduling.

As the subscriber network structure evolves in various ways and the optical Ethernet technology is spreading into the telecommunications market, it is necessary for one optical fiber terminator to provide two services individually or simultaneously to ensure optimal bandwidth allocation according to the service type of the optical fiber terminator. The case occurs.

However, there is a problem in this field that there is no efficient method for guaranteeing optimal bandwidth allocation for each service type of the optical termination device.

In addition, the wavelength multiplexing scheme is a transmission technology for an optical fiber network. In the related art, a single wavelength optical signal is transmitted in one optical fiber, and thus there is a problem in that the capacity of the optical fiber is limited.

In order to solve the above problems, an object of the present invention is to implement a fixed bandwidth service and a dynamic variable bandwidth service in one optical fiber terminator.

Another object is to provide an Ethernet passive optical network of a wavelength multiplexing method using multiple wavelengths.

To this end, according to the present invention, a method for allocating a bandwidth for each service of a wavelength-division Ethernet passive optical network, in a method for allocating bandwidths requested by a plurality of optical termination devices in an optical fiber termination device of a wavelength-division Ethernet passive optical network, includes: A first step of determining which one of the end devices is selected to support a fixed bandwidth; A second step of determining that the bandwidth requested by the optical termination device is allocated as the variable bandwidth if the fixed bandwidth is not supported and determining whether the optical termination device supports the variable bandwidth when the fixed bandwidth is supported; A third step of allocating the fixed bandwidth by subtracting the fixed bandwidth from the bandwidth requested by the optical termination device if the optical termination device supporting the fixed bandwidth supports the variable bandwidth; And a fourth step of not allocating the variable bandwidth to the optical termination device if the variable bandwidth allocated in the third process is negative or the optical termination device supporting the fixed bandwidth does not support the variable bandwidth. Characterized in that.

In addition, the bandwidth allocation method for each service of the wavelength-division Ethernet passive optical network according to the present invention, in the method for allocating bandwidths of a plurality of optical termination devices in the optical fiber termination device of the wavelength-division Ethernet passive optical network, Calculating a ratio of a bandwidth excluding a total sum of fixed bandwidths of the plurality of optical termination devices to accommodate the total sum of the variable bandwidths of the plurality of optical termination devices; Calculating a discrimination reference value of multiple wavelengths used for bandwidth allocation of the optical termination device according to the ratio; A third step of selecting one of the plurality of optical network termination devices to determine whether fixed bandwidth is supported and whether variable bandwidth is supported; A fourth step of allocating the variable bandwidth to any one of the multiple wavelengths if the optical termination device supports only the variable bandwidth as a result of the third step determination; A fifth step of allocating both the fixed bandwidth and the variable bandwidth to any one of the multiple wavelengths if the optical termination device supports both the fixed bandwidth and the variable bandwidth; And a sixth process of allocating the fixed bandwidth to any one of the multiple wavelengths if the optical termination device supports only the fixed bandwidth as a result of the determination of the third process.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows an overview of allocating bandwidth to an upstream stream to a fiber termination device using multiple wavelengths in an optical fiber termination device of a wavelength-division Ethernet passive optical network according to the present invention.

The upstream bandwidth (UBW), which is the maximum value of the bandwidth that the Ethernet passive fiber can allocate to the fiber terminator, and the sum of the bandwidths 210 requested by the n fiber terminators (RBW) are shown.

Since the bandwidth requested by the optical fiber termination apparatus of the present invention is a variable bandwidth and a fixed bandwidth is allocated to a bandwidth previously requested at the time of service subscription request from a service subscriber, the present invention discloses a method of allocating a variable bandwidth.

Upon receiving the request for bandwidth allocation from the optical termination device, the optical fiber termination device divides the bandwidth requested by the optical termination device into wavelengths of λ1 and λ2, and allocates the bandwidth based on the median bandwidth total (RBW) requested by the optical termination device. After allocating to λ1 in the order requested by the fiber terminator, if the sum of the bandwidths allocated to the fiber terminator so far is greater than the median of the total bandwidth (RBW) requested by the fiber terminator, the bandwidth of the fiber terminator to be allocated thereafter. Is assigned to λ2.

First, when the optical fiber terminating device receives a request for the variable bandwidth from the optical fiber terminating device, the optical fiber terminating device allocates the variable bandwidth to the bandwidth information table located therein and creates the information.

The bandwidth information table of the fiber termination device records whether the fixed bandwidth and the variable bandwidth are supported, the fixed bandwidth, and the bandwidth requested by the fiber termination device, and the fiber termination device supports the fixed bandwidth and the variable bandwidth, the fixed bandwidth, and the fiber termination. The device allocates a variable bandwidth by referring to the requested bandwidth.

A method of allocating a variable bandwidth by the optical fiber terminator is shown in FIG. 3.                     

3 is assuming that there are four optical network terminators (N = 4), and the bandwidth information table of the optical fiber terminator is shown in Table 1.

TABLE 1

ONU1 ONU2 ONU3 ONU4 Fixed bandwidth support One 0 0 One Whether variable bandwidth is supported One One One 0 Fixed bandwidth 20 0 0 30

As shown in Table 1, fixed bandwidth and variable bandwidth support of optical termination devices ONU1 to ONU4 and fixed bandwidth information of optical termination devices ONU1 and ONU4 supported by fixed bandwidth are recorded in the optical fiber termination devices.

1 indicates whether the fixed bandwidth and the variable bandwidth are supported, 0 means no support, and the unit of bandwidth is Mbps.

In this case, when the optical network termination devices ONU1 to ONU4 request the variable bandwidth as shown in Table 2, the variable bandwidth is allocated to each optical network termination device according to the flowchart of FIG. 3.

TABLE 2

ONU1 ONU2 ONU3 ONU4 Request bandwidth 50 30 30 50

First, the first optical network termination device (ONU1) is selected (S310). The fiber terminator allocates the variable bandwidth in the order of the requested fiber terminator.

It is determined whether the selected optical fiber termination device supports a fixed bandwidth (S320).

Since the first optical network termination device (ONU1) supports a fixed bandwidth as shown in Table 1, it is determined whether or not the variable bandwidth is supported in the next step (S330).

Since the first optical termination device (ONU1) also supports a variable bandwidth as shown in Table 1, a bandwidth obtained by subtracting a fixed bandwidth previously allocated from the bandwidth requested by the current optical termination device is allocated to the variable bandwidth (S380).

That is, since the bandwidth requested by the first optical termination device ONU1 is 50 Mbps as shown in Table 2 and the fixed bandwidth is 20 Mbps as shown in Table 1, the variable bandwidth of the first optical termination device ONU1 is allocated to 30 Mbps.

Here, it is determined whether the currently allocated variable bandwidth is negative (S390), and if the allocated variable bandwidth is negative, the variable bandwidth is reassigned to 0 (S340).

That is, since the requested bandwidth is already allocated as a fixed bandwidth, there is no need to reassign the variable bandwidth.

Then, the optical termination device of the next step is selected and repeated from the step S320.

Next, it is determined whether the selected second optical terminal device (ONU2) supports a fixed bandwidth (S320).

Since the second optical termination device (ONU2) does not support a fixed bandwidth, the optical fiber termination device allocates all the bandwidths requested by the current optical fiber termination device to the variable bandwidth (S370).

That is, the variable bandwidth of the second optical termination device (ONU2) is all assigned to the variable bandwidth 30Mbps as shown in Table 2.                     

After all of the above processes are allotted to the variable bandwidth of the optical fiber termination device (S360) is finished the variable bandwidth allocation process, the variable bandwidth allocated to each optical network termination device (ONU1 to ONU4) is shown in Table 3.

TABLE 3

ONU1 ONU2 ONU3 ONU4 Variable bandwidth 30 30 30 0

When all of the allocation of the variable bandwidth is performed in the optical fiber terminator as described above, the optical fiber terminator allocates an appropriate wavelength to each optical fiber terminator as shown in FIGS. 4A and 4B with reference to the bandwidth information table.

First, the optical fiber terminator subtracts the sum of the fixed bandwidth (SA) allocated to each optical terminator from the maximum bandwidth (TL) of the upstream and divides it by the sum of the variable bandwidths (DA) requested by each optical terminator. The available rate OF of the maximum bandwidth is obtained (S410).

That is, OF is as follows.

OF = {maximum bandwidth (TL)-sum of fixed bandwidth (SA)} / sum of requested variable bandwidth (DA)

Then, it is determined whether the available ratio OF of the maximum bandwidth is larger than 1 (S412), and a reference value for distinguishing wavelengths necessary for the allocation of the wavelength is obtained.

Specifically, if the available ratio (OF) of the maximum bandwidth is greater than 1, the maximum bandwidth (TL) remains even after allocating both the fixed bandwidth (SA) and the requested variable bandwidth (DA) at the maximum bandwidth (TL). On the contrary, if the available bandwidth (OF) of the maximum bandwidth is less than 1, the maximum bandwidth (TL) when allocating the fixed bandwidth (SA) at the maximum bandwidth (TL) and the requested variable bandwidth (DA) to the remaining portion It means that this is not enough.

Therefore, if the available bandwidth of the maximum bandwidth (OF) is greater than 1, by dividing all the sum of the fixed bandwidth (SA) and the variable bandwidth (DA) to be allocated to the optical termination device by the number of wavelengths to obtain the distinguishing reference value (CEN) of the wavelength In operation S414, the wavelength is distinguished and allocated only within the bandwidth allocated as the fixed bandwidth SA and the variable bandwidth DA.

On the other hand, if the available bandwidth (OF) of the maximum bandwidth is less than 1, the maximum bandwidth (TL) of the upstream is divided by the number of wavelengths to obtain the distinguishing reference value (CEN) of the wavelength, so that the entire maximum bandwidth TL is distinguished by the wavelength. To be assigned (S416).

4A and 4B, the wavelength is described using two wavelengths, λ1 and λ2, and the number of wavelengths is two.

After calculating the distinguishing reference value CEN of the wavelength as described above, the optical terminal device is selected one by one and the wavelength is allocated (S418).

First, it is determined whether the selected optical fiber termination device uses a fixed bandwidth (SA) (S420).

If the optical termination device does not use a fixed bandwidth (SA) means that the optical termination device uses only a variable bandwidth (DA), when the available bandwidth (OF) of the maximum bandwidth is greater than 1 (S422), that is, the variable bandwidth ( If the request width of the DA does not exceed the maximum bandwidth TL, the bandwidth CUR allocated so far is calculated (S424).

The bandwidth (CUR) allocated so far is cumulatively calculated by adding the variable bandwidth (DA) to be currently allocated to the bandwidth (CUR) previously allocated.

Then, it is determined whether the bandwidth CUR allocated thus far is smaller than the distinguishing reference value CEN of the wavelength (S426).

That is, if the bandwidth CUR allocated so far is smaller than the reference value that distinguishes λ1 and λ2, it means that the bandwidth CUR allocated so far may be allocated to λ1.

Therefore, if the bandwidth CUR allocated so far is smaller than the discrimination reference value CEN of the wavelength, the variable bandwidth DA currently required by the optical fiber terminator is allocated to λ1 (S428).

If the bandwidth CUR allocated so far is larger than the distinguishing reference value CEN of the wavelength, the variable bandwidth DA required by the current optical termination device is allocated to λ2 (S430).

In FIG. 4A and FIG. 4B, the number of wavelengths is limited to two. However, when the number of wavelengths is plural, the distinguishing reference value CEN of the wavelength is calculated by the number of wavelengths-1, and the wavelength CUR allocated so far is any wavelength. It is preferable that the wavelength is assigned by making it belong to the position of.

On the other hand, the optical termination device does not use a fixed bandwidth (SA), and if the available bandwidth (OF) of the maximum bandwidth is less than 1, that is, if the request width of the variable bandwidth (DA) exceeds the maximum bandwidth (TL) It is not possible to allocate all of the variable bandwidth DA requested by the device.

Accordingly, the present invention allocates only an available ratio (OF) of the maximum bandwidth of the request bandwidth when the request bandwidth exceeds the available bandwidth.

In more detail below, the optical terminator does not use a fixed bandwidth (SA), and if the available bandwidth (OF) of the maximum bandwidth is less than 1, the maximum bandwidth to the variable bandwidth (DA) requested by the optical termination device The cumulative calculation of the bandwidth CUR allocated thus far is performed by multiplying the available ratio OF and adding it to the bandwidth CUR allocated so far (S432).

Then, it is determined whether the bandwidth CUR allocated thus far is smaller than the distinguishing reference value CEN of the wavelength (S434).

That is, since the bandwidth CUR allocated so far is smaller than the reference value for distinguishing λ 1 from λ 2, this means that the bandwidth CUR allocated so far can be allocated to λ 1.

Therefore, if the bandwidth CUR allocated so far is smaller than the wavelength discrimination reference value CEN, λ1 is equal to the bandwidth obtained by multiplying the variable bandwidth DA required by the current optical terminator by the available ratio OF of the maximum bandwidth (OF). Assign (S436).

If the bandwidth CUR allocated so far is larger than the CEN of the wavelength, the bandwidth λ2 is allocated by multiplying the variable bandwidth DA required by the current optical terminator by the available ratio of the maximum bandwidth (OF). (S438).

On the other hand, when using the fixed bandwidth (SA) by determining whether the optical network termination device selected in step S420 uses a fixed bandwidth (SA), it is also determined whether or not to use the variable bandwidth (DA) (S440).

Here, if the optical fiber termination device uses a variable bandwidth (DA), it means that the currently selected optical network termination device uses both a fixed bandwidth (SA) and a variable bandwidth (DA).

In this case, it is determined whether the available bandwidth OF of the maximum bandwidth is greater than 1 (S442), and if the available bandwidth of the maximum bandwidth is greater than 1, the bandwidth CUR allocated so far is calculated (S444).

That is, if the bandwidth to be allocated as the fixed bandwidth SA and the variable bandwidth DA can be allocated to the maximum bandwidth TL, the bandwidth CUR allocated so far must be currently allocated to the previously allocated bandwidth CUR. The fixed bandwidth SA and the variable bandwidth DA are cumulatively calculated.

Then, it is determined whether the bandwidth CUR allocated thus far is smaller than the distinguishing reference value CEN of the wavelength (S446).

That is, if the bandwidth CUR allocated so far is smaller than the reference value that distinguishes λ1 and λ2, it means that the bandwidth CUR allocated so far may be allocated to λ1.

Therefore, if the bandwidth CUR allocated so far is smaller than the distinguishing reference value CEN of the wavelength, the fixed bandwidth SA and the variable bandwidth DA to be allocated to the current optical termination device are allocated to λ1 (S448).

If the bandwidth CUR allocated so far is larger than the CEN of the wavelength, the fixed bandwidth SA and the variable bandwidth DA to be allocated to the current optical termination device are allocated to λ2 (S450).

On the other hand, the optical termination device uses both a fixed bandwidth (SA) and a variable bandwidth (DA), where the available bandwidth (OF) of the maximum bandwidth is less than 1, that is, the fixed bandwidth (SA) and the variable to the optical termination device If all the bandwidths (DA) are allocated, the variable bandwidth (DA) requested by the optical termination device cannot be allocated beyond the maximum bandwidth (TL).

Accordingly, the present invention allocates only the available bandwidth (OF) of the maximum bandwidth of the request bandwidth to the optical termination device that supports both fixed bandwidth and variable bandwidth, if the request bandwidth exceeds the available bandwidth.

In more detail below, the optical terminator uses both a fixed bandwidth (SA) and a variable bandwidth (DA), and when the available bandwidth (OF) of the maximum bandwidth is less than 1, the variable bandwidth ( DA is multiplied by the available ratio OF of the maximum bandwidth and sums it with the fixed bandwidth SA to the bandwidth CUR allocated so far to cumulatively calculate the bandwidth CUR allocated so far (S452).

Then, it is determined whether the bandwidth CUR allocated thus far is smaller than the distinguishing reference value CEN of the wavelength (S454).

That is, since the bandwidth CUR allocated so far is smaller than the reference value for distinguishing λ 1 from λ 2, this means that the bandwidth CUR allocated so far can be allocated to λ 1.

Therefore, if the bandwidth CUR allocated so far is smaller than the wavelength discrimination reference value CEN, the variable bandwidth DA required by the current optical fiber terminator is multiplied by the available ratio OF of the maximum bandwidth, and then the fixed bandwidth SA Λ1 is allocated to the bandwidth λ1 (S456).

If the bandwidth CUR allocated so far is greater than the CEN of the wavelength, the variable bandwidth DA required by the current fiber termination device is multiplied by the available bandwidth of the maximum bandwidth, and then the fixed bandwidth SA As much as the combined bandwidth is allocated to λ2 (S458).                     

On the other hand, if it is determined in step S440 that the optical termination device does not use the variable bandwidth (DA), it means that the optical termination device uses only a fixed bandwidth (SA), the next process as the bandwidth ( CUR) is obtained (S460).

At this time, the bandwidth CUR allocated so far is cumulatively calculated by adding the fixed bandwidth DA to be currently allocated to the previously allocated bandwidth CUR.

In operation S462, it is determined whether the allocated bandwidth CUR is smaller than the distinguishing reference value CEN of the wavelength.

That is, since the bandwidth CUR allocated so far is smaller than the reference value for distinguishing λ 1 from λ 2, this means that the bandwidth CUR allocated so far can be allocated to λ 1.

Therefore, if the bandwidth CUR allocated so far is smaller than the discrimination reference value CEN of the wavelength, the fixed bandwidth DA to be allocated to the current optical fiber termination device is allocated to λ1 (S464).

If the bandwidth CUR allocated so far is larger than the distinguishing reference value CEN of the wavelength, a fixed bandwidth DA to be allocated to the current optical termination device is allocated to λ 2 (S466).

If the wavelength is allocated to the bandwidth allocation of the selected optical termination device as described above, another optical termination device is selected (S468), and the above process is repeated, and if the wavelength is assigned to all the optical termination devices (S470), the operation ends. do.

As described above, the present invention, in the optical media sharing between the optical fiber termination device of the wavelength-division Ethernet passive optical network and the optical fiber termination device that can change the wavelength, the bandwidth required by the optical fiber termination device according to the service type fixed bandwidth and dynamic variable By implementing the bandwidth to be used simultaneously, the optical media access function and transmission delay time of the optical subscriber line section can be improved, and the efficient service can be provided and the operation management can be performed.

Claims (9)

A method for allocating bandwidth requested by a plurality of optical termination devices in an optical fiber termination device of a wavelength-multiplexed Ethernet passive optical network, A first step of determining which one of the plurality of optical network termination devices supports a fixed bandwidth; Determining that the bandwidth is requested by the optical termination device as a variable bandwidth if the fixed bandwidth is not supported; and determining whether the optical termination device supports the variable bandwidth when the fixed bandwidth is supported; A third step of subtracting the fixed bandwidth from the requested bandwidth to the optical termination device when the optical termination device supporting the fixed bandwidth supports the variable bandwidth as a result of the determination in the second process; And A fourth step of not allocating the variable bandwidth to the optical termination device if the variable bandwidth allocated in the third process is negative or the optical termination device supporting the fixed bandwidth does not support the variable bandwidth as a result of the determination of the second process; Bandwidth allocation method for each service of the wavelength multiplexing Ethernet passive optical network comprising a. The method of claim 1, And the first, second, third, and fourth processes are performed to the plurality of optical termination devices. A method for allocating bandwidths of a plurality of optical termination devices in an optical fiber termination device of a wavelength-multiplexed Ethernet passive optical network, A first step of calculating a ratio of whether a bandwidth excluding a total of fixed bandwidths of the plurality of optical network termination devices can accommodate all of a total of variable bandwidths of the plurality of optical network termination devices from the maximum bandwidth of the optical fiber termination device; A second step of calculating a discrimination reference value of multiple wavelengths used for bandwidth allocation of the optical termination device according to the ratio; A third step of selecting one of the plurality of optical network termination devices to determine whether fixed bandwidth is supported and whether variable bandwidth is supported; A fourth step of allocating the variable bandwidth to any one of the multiple wavelengths if the optical termination device supports only the variable bandwidth as a result of the determination of the third step; A fifth step of allocating both the fixed bandwidth and the variable bandwidth to any one of the multiple wavelengths if the optical termination device supports both the fixed bandwidth and the variable bandwidth as a result of the determination of the third step; And And a sixth process of allocating the fixed bandwidth to any one of the multiple wavelengths if the optical termination device supports only a fixed bandwidth as a result of the determination of the third process. Bandwidth Allocation Method. The method of claim 3, wherein In the first step, The ratio is calculated by subtracting the sum of fixed bandwidths of the plurality of optical fiber termination devices from the maximum bandwidth of the optical fiber termination device and dividing it by the sum of the variable bandwidths of the plurality of optical network termination devices. Service-specific bandwidth allocation for Ethernet passive optical networks. The method of claim 3, wherein The second process, A first step of determining whether a bandwidth excluding a total of fixed bandwidths of the plurality of optical network termination apparatuses from the maximum bandwidth of the optical fiber termination equipment can accommodate the total sum of the variable bandwidths of the plurality of optical network termination apparatuses; If the determination result of the first step is acceptable, the sum of the fixed bandwidths of the plurality of optical termination devices and the sum of the variable bandwidths of the plurality of optical termination devices is summed and divided by the number of the multiple wavelengths to distinguish the multiple wavelengths. Calculating a reference value; And And a third step of calculating the division reference value of the multiple wavelengths by dividing the maximum bandwidth of the optical fiber terminator by the number of the multiple wavelengths if the determination result of the first step is unacceptable. Bandwidth allocation method by service of optical network. The method of claim 3, wherein The fourth process, A first step of determining whether a bandwidth excluding a total of fixed bandwidths of the plurality of optical network termination apparatuses from the maximum bandwidth of the optical fiber termination equipment can accommodate the total sum of the variable bandwidths of the plurality of optical network termination apparatuses; If the result of the determination in the first step is acceptable, the cumulative calculation is performed by adding the total bandwidth allocated to the plurality of optical termination devices to the total bandwidth allocated to the plurality of optical termination devices so far. A second step of doing; If the determination result of the first step is not acceptable, the sum of the bandwidths allocated to the plurality of optical network terminators so far is multiplied by the ratio of the first process to the variable bandwidth, and the plurality of optical network terminators are Cumulatively calculating the sum of the bandwidths allocated to the network; The total bandwidth allocated to the plurality of optical termination devices, calculated in the second step, is compared with the reference value for distinguishing the multiple wavelengths, and the variable bandwidth is the sum of the bandwidths allocated to the plurality of optical termination devices. A fourth step of allocating a wavelength belonging to the discrimination reference value of the multiple wavelengths; And Comparing the total bandwidth allocated to the plurality of optical termination devices, calculated in the third step, with the discrimination reference value of the multiple wavelengths, multiplying the variable bandwidth by the ratio of the first process, and converting it as the variable bandwidth. And a fifth step of allocating the sum of the bandwidths allocated to the plurality of optical termination devices to a wavelength belonging to the discrimination reference value of the multiple wavelengths. The method of claim 3, wherein The fifth process, A first step of determining whether a bandwidth excluding a total of fixed bandwidths of the plurality of optical network termination apparatuses from the maximum bandwidth of the optical fiber termination equipment can accommodate the total sum of the variable bandwidths of the plurality of optical network termination apparatuses; If the determination result of the first step is acceptable, the fixed bandwidth and the variable bandwidth are the sum of the bandwidths allocated to the plurality of optical network terminators so far to the sum of the bandwidths allocated to the plurality of optical network terminators. A second step of accumulating the sum; If the determination result of the first step is not acceptable, the sum of the bandwidths allocated to the plurality of optical network termination devices so far is multiplied by the ratio of the first process to the variable bandwidth, and the fixed bandwidth and the plurality of the previous bandwidths are multiplied. A third step of cumulatively calculating the sum of the bandwidths allocated to the two optical network termination devices; The fixed bandwidth and the variable bandwidth are allocated to the plurality of optical termination devices by comparing the total sum of the bandwidths allocated to the plurality of optical termination devices calculated in the second step with the discrimination reference value of the multiple wavelengths. A fourth step of allocating a total of the received bandwidths to wavelengths belonging to the distinguishing reference value of the multiple wavelengths; And Comparing the total bandwidth allocated to the plurality of optical termination devices, calculated in the third step, with the discrimination reference value of the multiple wavelengths, multiplying the variable bandwidth by the ratio of the first process, and converting it as the variable bandwidth. And a fifth step of allocating the sum of the bandwidths allocated to the plurality of optical termination devices to a wavelength belonging to the discrimination reference value of the multiple wavelengths, in addition to the fixed bandwidth. Bandwidth Allocation Method. The method of claim 3, wherein The sixth process, A first step of cumulatively calculating the total sum of the bandwidths allocated to the plurality of optical termination devices so far, and adding the fixed bandwidth to the sum total of the bandwidths allocated to the plurality of optical termination devices; The total bandwidth allocated to the plurality of optical termination devices, which has been calculated in the first step, is compared with the distinguishing reference value of the multiple wavelengths, and the fixed bandwidth is the sum of the bandwidth allocated to the plurality of optical termination devices. And a second step of allocating a wavelength belonging to the discrimination reference value of the multiple wavelengths. The method of claim 3, wherein And the third process, the fourth process, the fifth process, and the sixth process are performed to the plurality of optical network termination apparatuses.

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