JP2001111615A - Communication band controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a repeater concentrating two packet communication lines to automatically assign a frequency band so that the communication of the other communication line cannot be hindered even when the traffic of the one input communication line is increased. SOLUTION: Each input communication line is provided with a buffer 1a (1b) and a storage frame number measurement means 2a (2b). An output control means 3 referrs to the storage frame number measurement means 2a, 2b to repeat the processing for a prescribed unit time in a way that the output control means 3 reads frames from the buffer whose storage frame number is not zero for a prescribed unit time when number of storage frames of the other buffer is zero, or the output control means 3 reads no frames when the storage frame number is zero in both the buffers, or the output control means 3 halves the prescribed unit time, reads frames from the one buffer for the first half time and reads frames from the other buffer for the latter half time when the storage frame number of both the buffers is not zero. Thus, the frequency band can automatically be assigned without giving hindrance to the other communication line even when the traffic of the one input communication line is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for concentrating two input channels for transmitting variable-length frames to one output channel, even if the traffic of one of the input channels increases. The present invention relates to a communication band control device that automatically allocates a band without disturbing the other communication.

[0002]

2. Description of the Related Art Conventionally, when two input communication paths for transmitting variable-length frames are concentrated on one output communication path, all the frames are concentrated on the input side, regardless of the contents of the frames. It is managed by one buffer. If the communication on the input channel increases and the buffer is likely to overflow, the input frames from both input channels are discarded for a while, or a Pause operation is issued to both terminals on the input channel, and both sides are issued. Suppress input frames from the communication channel for a while.

[0003]

However, according to the conventional line concentrating method as described above, when the communication volume of only one communication path increases, the communication of the other communication path is also hindered, and both communication paths are inhibited. There is a problem such as a decrease in the bandwidth of the input communication path.

The present invention has been made in view of such circumstances, and when two input communication paths for transmitting variable-length frames are concentrated to one output communication path, one input communication path is used. It is an object of the present invention to provide a communication band control device that automatically allocates a band so that the other communication is not hindered even if the communication amount increases.

[0005]

In order to solve the above problems, the present invention has the following arrangement. That is, the first buffer stores the frames input from the first input channel. The second buffer stores frames input from the second input channel. Then, the first accumulated frame number measuring means measures the number of frames accumulated in the first buffer. The second accumulated frame number measuring means measures the number of frames accumulated in the second buffer. Further, the output control means refers to the first and second accumulated frame number measuring means for each predetermined unit time, and each of the first and second buffers within the unit time until the next reference. Is determined. As a determination method in this case, when only one of the number of accumulated frames in the first and second buffers is 0, the read time of a buffer whose accumulated frame number is not 0 is 100% of the unit time, and the read time of the buffer whose accumulated frame number is 0 is 100%. Read time is unit time 0
%, When the number of accumulated frames is both 0, the read time of both buffers is set to 0% of the unit time, and when the number of accumulated frames is not 0, the read time of both buffers is set to 50% of the unit time. The selection output means is controlled so as to read the first and second buffers. And
The selection output means is a band designated by the output control means,
The frames are read from the first and second buffers and output to the output communication path.

As described above, transmission of a variable-length frame 2
When concentrating two input communication paths to one output communication path,
A communication band control device that automatically allocates a band that does not hinder the other communication even when the communication amount of one input communication channel increases.

That is, the present invention provides a first buffer for storing frames input from a first input channel, a second buffer for storing frames input from a second input channel, First accumulated frame number measuring means for measuring the number of frames accumulated in the buffer, second accumulated frame number measuring means for measuring the number of frames accumulated in the second buffer, and first accumulated frame With reference to the measurement results of the number measurement means and the second accumulated frame number measurement means, calculate the transmission bandwidth allocated to each of the first buffer and the second buffer, output control means for instructing reading, and output A selection output unit that reads a frame from the first buffer and the second buffer in a band specified by the control unit, and outputs the read frame to an output communication path.

[0008] First, the variable length frame is transmitted.
When concentrating the second input channel to one output channel, the first buffer stores the frames input from the first input channel, and the second buffer stores the frames input from the second input channel. The input frame is accumulated, the first accumulated frame number measuring means measures the number of frames accumulated in the first buffer, and the second accumulated frame number measuring means measures the number of frames accumulated in the second buffer. The output control means refers to the first and second accumulated frame number measuring means for each predetermined unit time, and each of the first and second buffers within the unit time until the next reference. Is determined. As a determination method, when the number of accumulated frames in the first and second buffers is 0 in only one of them, the read time of the buffer in which the number of accumulated frames is not 0 is 100 unit time.
%, The read time of the buffer having the accumulated frame number of 0 is set to 0% of the unit time, and when the accumulated frame numbers are both 0,
The read time of both buffers is 0% of the unit time,
If both the accumulated frame numbers are not 0, the selection output means is controlled to read the first and second buffers with the read time of both buffers being 50% of the unit time, and the selection output means controls the output. The frame can be read from the first and second buffers in the band specified by the means and output to the output communication path.

According to the present invention, there is provided a first reading data amount measuring device for cumulatively calculating a data amount of a frame previously read from the first buffer at an output side of the first buffer according to the above invention. Means, on the output side of the second buffer, a second read data amount measuring means for cumulatively calculating the data amount of the frame read from the second buffer in the past; The read data amount measuring means cumulatively calculates the data amount of the frame read from the first buffer in the past, and the second read data amount measuring means accumulates the data amount of the frame read from the second buffer. Calculating, the output control means refers to the first and second accumulated frame number measuring means for each predetermined unit time, and the first and second buffers within the unit time until the next reference. Respectively The read time is determined. As a determination method, when the number of accumulated frames in the first and second buffers is only 0, the read time of a buffer whose accumulated frame number is not 0 is 100% of the unit time, and the number of accumulated frames is Is 0% of the unit time, the readout time of both buffers is 0% of the unit time, and the readout time of both buffers is 0% of the unit time. The buffer read time is
Time calculated by multiplying a value obtained by dividing a reciprocal of the read data amount of the first read data amount measuring means by a sum of reciprocals of the read data amounts of the first and second read data amount measuring means by a unit time. The read time of the second buffer is a value obtained by dividing the reciprocal of the read data amount of the second read data amount measuring means by the sum of the reciprocals of the read data amounts of the first and second read data amount measuring means. As a time calculated by multiplying the first and second buffers, the selection and output means can be controlled to read the first and second buffers.

According to the present invention, the first and second read data amount measuring means of the above invention further have a function of recording a transmission time of a previously transmitted frame and a frame length in association with each other. In calculating the read data amount by the first and second read data amount measuring means, the weight function A (0 ≦ A) is set such that the value decreases as the time lapse from the time when the frame is transmitted to the current time is larger. Is calculated.

The present invention also provides a first accumulated data amount measuring means for measuring the amount of data accumulated in the first buffer, instead of the first accumulated frame number measuring means of the above invention, Instead of the accumulated frame number measuring means, the second accumulated data amount measuring means for measuring the amount of data accumulated in the second buffer is replaced with a first accumulated data amount measuring means. The amount of data accumulated in the first buffer is measured, the second accumulated data amount measuring means measures the amount of data accumulated in the second buffer, and the output control means operates the first and second accumulated data. Quantity measurement means,
Reference is made for each predetermined unit time, and the read time of each of the first and second buffers within the unit time until the next reference is determined.However, the read time of the first buffer is determined as The accumulated data amount of the first accumulated data amount measuring means is a time calculated by multiplying the value obtained by dividing the sum of the accumulated data amounts of the first and second accumulated data amount measuring means by a unit time, The read time of the second buffer is
The stored data amount of the second stored data amount measuring means is first,
The selection output unit is controlled so as to read the first and second buffers as a time calculated by multiplying the value obtained by multiplying the sum of the accumulated data amounts of the second accumulated data amount measurement unit by the unit time. It is like that.

[0012] The present invention further comprises the first accumulated frame number measuring means of the present invention reading the application protocol information of the frames accumulated in the first buffer and calculating the read priority of the first buffer. The first application priority calculating means, and the second accumulated frame number measuring means reads the application protocol information of the frames accumulated in the second buffer and calculates the read priority of the second buffer. The first application priority calculation means reads the application protocol information of the frame stored in the first buffer and reads the first buffer. The priority is calculated, and the second application priority calculating means calculates the priority. The application protocol information of the frame stored in the buffer is read, the read priority of the second buffer is calculated, and the output control means causes the first and second application priority calculation means to change the read priority for each predetermined unit time. To determine the read time of each of the first and second buffers within the unit time until the next reference. As a determination method, the read time of the first buffer is determined by the first application priority. The read priority of the calculation means is divided by the sum of the read priorities of the first and second application priority calculation means,
The read time of the second buffer is the read time of the second application priority calculating means, and the read time of the second application priority calculating means is the time calculated by multiplying the unit time by the unit time. Divided by the sum
As a time calculated by multiplying the unit time, the selection output means is controlled to read the first and second buffers.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below in detail with reference to the drawings.

First, a first embodiment of the present invention will be described. FIG. 1 is a configuration diagram of a communication band control device according to a first embodiment of the present invention, in which buffers 1a and 1b provided for each input communication path for storing frames input from the communication path, and respective buffers 1a and 1b. Accumulated frame number measuring means 2a, 2b for measuring the number of frames accumulated in buffers 1a, 1b, and accumulated frame number measuring means 2a, 2b
Output control means 3 for controlling the readout based on the accumulated frame number information, and selective output means 4 for reading out the frames from the buffers 1a and 1b in the band specified by the output control means 3 and outputting them to the communication path. ing.

Next, the operation of this embodiment will be described. First, frames from two input communication paths are written into buffers 1a and 1b provided for each of the communication paths. At this time, the accumulated frame number measuring means 2a, 2
“b” detects frame writing to the buffers 1a and 1b, respectively, and measures the number of frames by incrementing a counting means (not shown) such as a counter. At the same time, the accumulated frame number measuring means 2a, 2b
Is also measured by decrementing the counting means (not shown) of the data read from the buffers 1a and 1b, respectively.

Next, the output control means 3 refers to the two accumulated frame number measuring means 2a and 2b. If only one of the accumulated frame numbers is 0, the output control means 3 applies the data to the buffer 1a or 1b whose accumulated frame number is not 0. Only in a predetermined unit time, reading is performed. When the number of accumulated frames is both 0, reading is not performed. When the number of accumulated frames is not both 0, the reading time t1 assigned to the buffer 1a and the reading time assigned to the buffer 1b are defined as T, where T is a predetermined unit time. t2 is calculated from the following equation (1), and the selection output means 4 is controlled so that one buffer is read in the first half and the other buffer is read in the second half.

[0017]

(Equation 1) (1) In this way, the above processing is repeated at a cycle of a predetermined unit time T.

Next, the selection output means 4 is connected to the output control means 3
Buffer 1 based on the read time notified by
The reading is performed for a and 1b. First, a notification of the read time t1 to the buffer 1a is received from the output control means 3, and then the length of the frame to be read is inquired to the buffer 1a.

Such reading is repeated until the following condition is satisfied. That is, when all the frames in the buffer 1a have been read within the read time t1a assigned to the buffer 1a, the operation directly proceeds to the reading operation of the buffer 1b. Conversely, if it is determined that reading of the next frame is not completed within the remaining time of reading, the remaining time is stocked and the buffer 1
Move on to the reading operation of b. At this time, the remaining stock time is added to the read time notified next time. Also,
The same processing as described above is performed on the buffer 1b with the read time set to t2, and after completion, the process waits until the next read time notification.

As described above, according to the first embodiment of the present invention, even in a situation where the traffic of only one of the two input communication paths of the line consolidation increases. In addition, band control can be performed independently on the two input communication paths, and the same communication band can be automatically performed on the two input communication paths.

In the above-described first embodiment, the band control device for concentrating two input communication paths has been described. However, the number of input communication paths is set to n, and each input communication path has a buffer and the number of accumulated frames. It is good also as a structure provided with a measuring means. At that time, a certain x (1 ≦ x ≦ n) by the output control means
The calculation of the read time tx allocated to the buffer of the number of times is as follows: T is a predetermined unit time, 1 if the number of accumulated frames of the xth accumulated frame number measuring means is not 0, and 0 if the number of accumulated frames is 0. Let Fx be the function that satisfies the following equation (2).

[0022]

(Equation 2) (2) Next, a second embodiment of the present invention will be described. FIG. 2 is a configuration diagram of a communication band control device according to the second embodiment of the present invention. This communication band control device includes buffers 1a and 1b provided for each input communication path for storing frames input from a communication path, and the number of stored frames for measuring the number of frames stored in each of the buffers 1a and 1b. It has a function of correlating and recording the transmission time and frame length of the frames read from the respective buffers 1a and 1b with the measuring means 2a and 2b, and transmits the frames when calculating the read data amount. The weighting function A (0
≦ A) multiplied by read data amount measuring means 5
a, 5b, accumulated frame number information of the accumulated frame number measuring means 2a, 2b, and read data amount measuring means 5a, 5b.
Output control means 3 for controlling the reading based on the read data amount information of the buffer, and selective output means 4 for reading the frames from the buffers 1a and 1b in the band specified by the output control means 3 and outputting the frames to the communication path. ing.

Next, the operation of the second embodiment will be described. The operations of the buffers 1a and 1b, the accumulated frame number measuring means 2a and 2b, and the selection output means 4 are described below.
Since it is the same as the above-described first embodiment, the description is omitted.

The read data amount measuring means 5a, 5b
Each of the frames read from the buffers 1a and 1b is recorded in correspondence with the read time and the frame length. When cumulatively calculating the frame length, a function A (for example, A = 1−0.1 × the difference between the current time and the read time, However, if A <0, A = 0) is multiplied by the frame length for calculation. The value obtained as a result is notified to the output control means 4 as read data amount information.

Then, the output control means 4 refers to the two accumulated frame number measuring means 2a and 2b. If only one of the accumulated frame numbers is 0, the output control means 4 applies only to the buffer 1a or 1b having a non-zero accumulated frame number. The reading is performed in a predetermined unit time. If the number of accumulated frames is not both 0, no reading is performed. If the number of accumulated frames is not both 0, a predetermined unit time is set to T, and the buffers 1a, 1
Assuming that the respective read data amounts of Rb and Rb are R1 and R2, the read time t1 allocated to the buffer 1a and the read time t2 allocated to the buffer 1b are calculated by the following equation (3). 1a, and then controls the selection output means 4 to read the buffer 1b within the read time t2.

[0026]

(Equation 3) (3) Then, such processing is repeated at a cycle of a predetermined unit time T.

As described above, according to the second embodiment of the present invention, even in a situation where the traffic of only one of the two input communication paths of the line consolidation increases, Bandwidth control is performed independently on the two input communication paths, and the band of the two input communication paths that has performed more communication in the past is more limited. The communication band can be automatically set.

In the above-described second embodiment, the band control device for concentrating two input communication paths has been described. However, the number of input communication paths is n, and a buffer and the number of accumulated frames are provided for each input communication path. A configuration may be provided in which a measurement unit and a read data amount measurement unit are provided. At this time, the read time tx assigned to the x-th (1 ≦ x ≦ n) -th buffer by the output control means is a predetermined unit time T, a certain x
The function that becomes 1 when the number of accumulated frames is not 0 and 0 when the number of accumulated frames is 0 is the read data amount calculated by the xth read data amount measuring means. Is defined as Rx, and is calculated by the following equation (4).

[0029]

(Equation 4) (4) Next, a third embodiment of the present invention will be described. FIG. 3 is a configuration diagram of a communication band control device according to the third embodiment of the present invention. This communication band control device includes buffers 1a and 1b provided for each input communication path for storing frames input from the communication path, and buffers 1a and 1b.
b, the accumulated data amount measuring means 6a, 6b for measuring the amount of data accumulated in "b", and the accumulated data amount measuring means 6a, 6b.
Output control means 3 for controlling the reading based on the accumulated data amount information of the buffer, and selective output means 4 for reading the frames from the buffers 1a and 1b in the band specified by the output control means 3 and outputting the frames to the communication path. ing.

Next, the operation of the third embodiment will be described. The operations of the buffers 1a and 1b and the selection output means 4 are the same as those in the first embodiment, and a description thereof will be omitted.

The accumulated data amount measuring means 6a and 6b measure the data amount written in the buffers 1a and 1b, respectively, by incrementing a counting means (not shown) such as a counter. At the same time, the accumulated data amount measuring means 6a and 6b also measure the data amount read from the buffers 1a and 1b, respectively, by decrementing the counting means (not shown). The accumulated data amount measuring means 6a and 6b measure the data amount written in the buffers 1a and 1b by the counting means as described above.

The output control means 3 refers to the stored data amount measuring means 6a, 6b, sets a predetermined unit time to T, and sets the respective stored data amounts of the buffers 1a, 1b to D.
1, D2, the read time t1 assigned to the buffer 1a and the read time t2 assigned to the buffer 1b are calculated by the following equation (5), and the read time t
1, the control of the selection output means 4 is performed so that the buffer 1a is read out within the read time t2.

[0033]

(Equation 5) (5) Then, such processing is repeated at a cycle of a predetermined unit time T.

As described above, according to the third embodiment of the present invention, even in a situation where the traffic of only one of the two input communication paths of the line consolidation increases, Bandwidth control can be performed on each of the two input communication paths independently, and a communication band having a ratio commensurate with the traffic can be automatically performed in accordance with the communication conditions of the two input communication paths.

In the third embodiment described above, the band control device for concentrating two input communication paths has been described. However, the number of input communication paths is n, and a buffer and stored data are provided for each of the input communication paths. It is good also as composition provided with quantity measuring means. At this time, the read time tx assigned to the x-th (1 ≦ x ≦ n) -th buffer by the output control means is a predetermined unit time of T, and the accumulated data calculated by the x-th accumulated data amount measuring means. If the amount is Dx, the following equation (6)
Is calculated by

[0036]

(Equation 6) (6) Next, a fourth embodiment of the present invention will be described. FIG. 4 is a configuration diagram of a communication band control device according to the fourth embodiment of the present invention. This communication band control device includes buffers 1a and 1b provided for each input communication path for storing frames input from the communication path, and buffers 1a and 1b.
application priority calculation means 7a for reading the application protocol information of the frame stored in the buffer 1b and calculating the read priority of the buffers 1a and 1b by adding and subtracting a predetermined application priority constant according to the writing and reading of the frame. , 7
b, the output control means 3 for controlling reading based on the read priority information of the application priority calculating means 7a, 7b, and reading the frames from the buffers 1a, 1b in the band designated by the output control means 3, and And a selection output means 4 for outputting to a road.

Next, the operation of the fourth embodiment will be described. The operations of the buffers 1a and 1b and the selection output means 4 are the same as those in the first embodiment, and the description thereof will be omitted.

Application priority calculation means 7a, 7
b refers to application protocol information (TOS value or the like in an IP datagram) included in the frame when the frame is written into the buffers 1a and 1b, respectively, and is predetermined for the information. Priority constant (for example, a constant such as 8 for TELNET that requires low delay, and 1 for NNTP, etc., which are less important)
Is added to counting means such as a counter (not shown). Conversely, when a frame is read, the priority constant corresponding to the information is subtracted from the counting means with reference to the application protocol information of the frame. The application priority calculating means 7a, 7b calculates the read priority of the frames stored in the buffers 1a, 1b by such processing.

The output control means 3 refers to the information of the application priority calculation means 7a and 7b and sets a predetermined unit time to T, and sets the read priorities of the buffers 1a and 1b to P1 and P2. The read time t1 assigned to the buffer 1b and the read time t2 assigned to the buffer 1b are calculated by the following equation (7), the buffer 1a is read within the read time t1, and the buffer 1b is read within the read time t2. The selection output means 4 is controlled so as to perform reading.

[0040]

(Equation 7) (7) Then, such processing is repeated at a cycle of a predetermined unit time T.

As described above, according to the fourth embodiment of the present invention, even in a situation where the traffic of only one of the two input communication paths to be concentrated increases. In addition, it is possible to control the bandwidth of each of the two input communication paths independently, and to automatically perform a communication band at a rate matching the importance of the application handled by each of the two input communication paths.

In the fourth embodiment, the band control device for concentrating two input communication paths has been described. However, the number of input communication paths is n, and a buffer and a storage data amount measuring means are provided for each of the input communication paths. May be provided. At this time, the read time tx assigned to a certain x (1 ≦ x ≦ n) buffer by the output control means is a predetermined unit time of T and the read time calculated by the certain x-th application priority calculating means. Assuming that the priority is Px, it is calculated by the following Expression 8.

[0043]

(Equation 8) (8)

[0044]

As described above, according to the present invention,
A frame is distinguished for each input channel and stored in a buffer, and a communication band of each buffer is allocated by an output control unit based on a use state of each input channel, so that one of the two input channels to be converged is connected. Even in a situation where the traffic increases only in the input communication path, the band control can be performed in an independent state for each of the two input communication paths. Therefore, it is possible to automatically control the communication band according to the current communication status. Thus, even when the communication amount of only one of the communication paths increases, the band level of both input communication paths can be maintained without the communication of the other communication path being hindered.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a communication band control device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a communication band control device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a communication band control device according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a communication band control device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1a, 1b Buffers 2a, 2b Accumulated frame number measuring means 3 Output control means 4 Selection output means 5a, 5b Read data amount measuring means 6a, 6b Accumulated data amount measuring means 7a, 7b Application priority calculating means

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Tetsuya Nagai 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture F-term (reference) 5K028 EE12 KK32 SS24 5K030 HA08 HB28 JA01 KA03 MA13 MB15 9A001 BB04 CC07

Claims (5)

[Claims] 1. A first buffer for storing frames input from a first input channel, a second buffer for storing frames input from a second input channel, and storing in the first buffer First accumulated frame number measuring means for measuring the number of frames stored, second accumulated frame number measuring means for measuring the number of frames accumulated in the second buffer, and the first accumulated frame number Measuring means, with reference to the measurement result of the second accumulated frame number measuring means, calculate the transmission bandwidth to be assigned to each of the first buffer and the second buffer, output control means for instructing readout, Selecting output means for reading a frame from the first buffer and the second buffer in a band designated by the output control means and outputting the read frame to an output communication path; When the first input communication path and the second input communication path for transmitting a variable length frame are concentrated to one output communication path, the first storage frame is output by the output control means. Number counting means and the second accumulated frame number counting means are referenced for each predetermined unit time, and within the unit time until the next reference, the first buffer and the second buffer When determining each read time, when the number of accumulated frames of the first buffer and the second buffer is 0, if only one of them is 0, the read time of the buffer whose accumulated frame number is not 0 is 100 unit time. %, The read time of the buffer having the accumulated frame number of 0 is 0% of the unit time, and when both are 0, the read time of both buffers is 0% of the unit time, and both are 0. In this case, the readout time of both buffers is set to 50% of the unit time, the selection output means is controlled so as to read out the first buffer and the second buffer, and a frame is sent to the output communication path. A communication band control device for transmitting. 2. A first buffer for storing frames input from a first input channel, a second buffer for storing frames input from a second input channel, and storing in the first buffer. First accumulated frame number measuring means for measuring the number of frames stored, second accumulated frame number measuring means for measuring the number of frames accumulated in the second buffer, and the first accumulated frame number Measuring means, with reference to the measurement result of the second accumulated frame number measuring means, calculate the transmission bandwidth to be assigned to each of the first buffer and the second buffer, output control means for instructing readout, Selecting output means for reading a frame from the first buffer and the second buffer in a band designated by the output control means and outputting the read frame to an output communication path; A first read data amount measuring unit, connected to an output side of the first buffer, for cumulatively calculating the data amount of a frame read in the past from the first buffer; and the second buffer A second read data amount measuring means connected to the output side of the second buffer and cumulatively calculating the data amount of the frame read in the past from the second buffer. The accumulated frame number measuring means and the second accumulated frame number measuring means are referred to for each predetermined unit time, and the first buffer within the unit time until the next reference is set, and the second buffer When determining the read time of each of the buffers, when only one of the number of accumulated frames of the first buffer and the second buffer is 0, reading of a buffer whose accumulated frame number is not 0 When the number of frames stored in the first buffer and the number of frames stored in the second buffer are both 0, the read time of the buffer having the number of accumulated frames of 0 is 0% of the unit time. If the read time of the buffer is 0% of the unit time, and the number of accumulated frames in the first buffer and the second buffer is not 0, the read time of the first buffer is the first read data. The reciprocal of the read data amount of the amount measuring means is divided by the sum of the reciprocal of the read data amount of the first read data amount measuring means and the reciprocal of the read data amount of the second read data amount measuring means. , A time calculated by multiplying a unit time, the read time of the second buffer, the reciprocal of the read data amount of the second read data amount measuring means, the second A value calculated by multiplying a value obtained by dividing the sum of the reciprocal of the read data amount of the read data amount measuring means and the reciprocal of the read data amount of the second read data amount means by a unit time, and A communication band control device, wherein the selection output means is controlled so as to read out one buffer and the second buffer, and transmits a frame to an output communication path. 3. The first read data amount measuring means and the second read data amount measuring means have a function of recording a transmission time of a previously transmitted frame and a frame length in association with each other. When calculating the read data amount by the first read data amount measuring means and the second read data amount measuring means, the weight becomes smaller as the time lapse from the time when the frame is transmitted to the current time is larger. 3. The communication band control device according to claim 2, wherein the calculation is performed by multiplying a function A (0 ≦ A). 4. A first buffer for storing frames input from a first input channel, a second buffer for storing frames input from a second input channel, and storing in the first buffer First accumulated data amount measuring means for measuring the amount of data obtained, second accumulated data amount measuring means for measuring the amount of data accumulated in the second buffer, and first accumulated data amount measuring means And output control means for referring to the measurement result of the second accumulated data amount measuring means, calculating a transmission bandwidth to be assigned to each of the first buffer and the second buffer, and instructing a read, Selecting output means for reading a frame from the first buffer and the second buffer in a band specified by the output control means and outputting the read frame to an output communication path; When the first input communication path and the second input communication path for transmitting a stream are converged to one output communication path, the output control means controls the first stored data amount measurement means, The second accumulated data amount measuring means is referred to at every predetermined unit time, and the reading time of each of the first buffer and the second buffer within the unit time until the next reference is determined. When determining, the read time of the first buffer, the accumulated data amount of the first accumulated data amount measuring means, the accumulated data amount of the first accumulated data amount measuring means and the second accumulated data A value calculated by multiplying the value obtained by dividing the sum of the accumulated data amounts of the amount measuring means by a unit time is used.The reading time of the second buffer is obtained by calculating the accumulated data amount of the second accumulated data amount measuring means. , The first accumulated data amount A value obtained by multiplying a value obtained by dividing the accumulated data amount of the measuring means and the accumulated data amount of the second accumulated data amount means by a unit time, the first buffer and the second buffer A communication band control device for controlling the selection output means so as to read out the frame and transmitting a frame to an output communication path. 5. A first buffer for storing frames input from a first input channel, a second buffer for storing frames input from a second input channel, and storing in the first buffer First application priority calculation means for reading the application protocol information of the frame that has been read and calculating the read priority of the first buffer; and reading the application protocol information of the frame stored in the second buffer. A second application priority calculation means for calculating a read priority of the second buffer; a first application priority calculation means; and a calculation result of the second application priority calculation means. Calculating and reading the transmission bandwidth allocated to each of the first buffer and the second buffer. Output control means for instructing output, and selection output means for reading a frame from the first buffer and the second buffer in a band specified by the output control means, and outputting the read frame to an output communication path. The output control unit refers to the first application priority calculation unit and the second application priority calculation unit for each predetermined unit time, and within the unit time until the next reference. In, when determining the read time of each of the first buffer and the second buffer, the read time of the first buffer, the read priority of the first application priority calculation means, The read priority of the first application priority calculation means and the read priority of the second application priority calculation means And a value calculated by multiplying a value obtained by dividing the sum by the unit time, the read time of the second buffer, the read priority of the second application priority calculation means, the first application priority The first buffer and the second buffer, as a time calculated by multiplying a value obtained by dividing the read priority of the degree calculation means and the read priority of the second application priority calculation means by a unit time, A communication band control device for controlling the selection output means so as to read out the buffer of the communication band, and transmitting a frame to an output communication path.