JP2000134213A - Communication equipment, communication method and served medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an ATM cell from being aborted due to violation of a frequency band in a network by detecting an output of the ATM cell to the network so as to control a transmission timing of an ATM cell to be outputted next. SOLUTION: A cell processing section 12 divides a 1st communication signal. A traffic shaper section 14 stores signals divided by the cell processing section 12 and outputs the signal in a prescribed timing. A cell processing section 16 divides a 2nd communication signal. A traffic shaper section 18 stores signals divided by the cell processing section 16 and outputs them in a prescribed timing. An arbiter section 15 outputs the 1st communication signal outputted from the traffic shaper section 14 and the 2nd communication signal outputted from the traffic shaper section 18 by controlling the output sequence and controls the traffic shaper section 14 according to the output result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication apparatus, a communication method, and a providing medium, and more particularly to outputting a communication signal to a network by controlling the output of the communication signal to the network based on the priority of the communication signal. The present invention relates to a communication device, a communication method, and a providing medium that prevent a communication signal from being discarded due to band limitation of the communication signal when the communication signal is band-limited.

[0002]

2. Description of the Related Art ATM (Asynchronous Transfer Mod)
e) There is a communication system that communicates with another communication device connected via a network using an exchange. FIG. 8 illustrates a configuration example of a communication device that outputs two types of communication data to a network.

[0003] CPU (Central Processing Unit) 1
Converts two types of communication data output to the network into C
Read from the memory 2 via the PU bus 3 and SAR
(Segmentation and Reassembly) part 4
Dual port RAM (Random Access) in the AR unit 4
Memory) 11. The two types of communication data written in the dual port RAM 11 are output to the cell unit 12 and the cell unit 16, respectively.

[0004] In the celling section 12, the communication data 1 is
The data is divided into 48 bytes defined by the ATM network, converted into cells, and output to the header adding unit 13.
In the header adding unit 13, for each ATM cell,
Communication data 1 with an ATM header indicating the destination
Is output to the traffic shaper unit 14. In the traffic shaper unit 14, each ATM cell is
The ATM cells which have been accumulated until the transmission timing of the TM cells and whose transmission timing has arrived are output to the arbiter unit 15.

The communication data 2 is stored in a dual port RAM 1
1 to the celling unit 16. The operation of the cell unit 16 to the traffic shaper unit 18 is the same as the operation of the cell unit 12 to the traffic shaper unit 14, and a description thereof will be omitted.

In the arbiter unit 15, the ATM cell of the communication data 1 input from the traffic shaper unit 14 and the ATM cell of the communication data 2 input from the traffic shaper unit 18 are PHY (Physical Layer Protocol).
col) section 5. If the ATM cell of the communication data 1 input from the traffic shaper unit 14 and the ATM cell of the communication data 2 input from the traffic shaper unit 18 have the same transmission timing, the communication data 1
The transmission order is assigned to the ATM cell of the communication data 2 and the ATM cell of the communication data 2. Based on the transmission order, each ATM cell is transmitted.
The cell is output to the PHY unit 5. In the PHY part 5,
After performing processing depending on a specific physical layer for each ATM cell, the ATM cell is transmitted through an optical fiber (not shown).
Communication is performed by output to a TM exchange (not shown).

[0007]

In a network using an ATM exchange, before transmitting communication data to the network, a destination or a band is negotiated with the network by calling in advance, and a route to the communication destination (e.g., Path) is determined, and if a band requested by the user exists on the route, acceptance of communication is permitted. Call information based on this acceptance permission (in the header adding unit 13 in FIG. 8, A
(Contained in the ATM header added to the payload of the TM cell) is included in the ATM cell, and during actual communication,
The ATM exchange monitors user traffic (usage status). When ATM cells are transmitted to a network exceeding a predetermined band and the network is congested, the transmitted ATM cells may be discarded by an exchange block such as an ATM switch.

Normally, the traffic shaper 1 shown in FIG.
4 and in the traffic shaper section 18, each AT
Since the transmission timing of the M cell is controlled based on the determined band, the transmission timing of the ATM cell exceeds the determined band.
No cells are sent to the network.

However, AT of two types of communication data
When the transmission timings of the M cells are the same, the ATM cells in the arbiter 15 shown in FIG.
The HY unit 5 may not output to the PHY unit 5 at the transmission timing from the traffic shaper unit 14.
In this case, the ATM cell whose transmission order is later is output to the PHY unit 5 at the next transmittable timing, and is transmitted to the network after the transmission timing instructed by the traffic shaper unit 14.

An ATM cell transmitted with the same routing information next to an ATM cell transmitted to the network with a delay from the transmission timing instructed by the traffic shaper unit 14 or the traffic shaper unit 18 is instantaneously determined in advance. Above the specified bandwidth, and the aforementioned A
The traffic monitoring by the TM exchange may be regarded as a band violation cell and the ATM cell may be discarded from the network.

FIG. 9 shows a case where the band is violated instantaneously.
With reference to FIG. In FIG. 9, a square figure represents an ATM cell of communication data 1, and a circle figure represents an ATM cell of communication data 2. AT of communication data 1
The transmission timing of the M cell is time t1, time t4, and time t7, and the transmission timing of the communication data 2 is
It is from time t2 to time t6. From time t1 to time t3, since each ATM cell is not at the same transmission timing as the other ATM cells, it is output to the PHY unit 5 at the specified transmission timing.

At time t4, the ATM of communication data 1
The cell and the ATM cell of the communication data 2 have the same transmission timing, and the arbiter unit 15 in FIG. 8 replaces the ATM cell of the communication data 1 with the ATM cell of the communication data 2, for example.
The transmission order is made earlier than the TM cell. In this sending order, 2
One ATM cell is transmitted to the PHY unit 5, but the ATM cell of the communication data 2 is transmitted to the PHY unit 5 at a timing different from the transmission timing from the traffic shaper unit 14 (time t4 'in FIG. 9). There are cases.

The ATM cell of the communication data 2 is transmitted at time t4 'because the timing at which the ATM cell was transmitted to the network was delayed from time t4 to time t4'.
There is a problem that the cell transmission interval (set rate) between the TM cell and the ATM cell transmitted at time t5 becomes short, and the ATM cell of the communication data 2 instantaneously violates the band (rate exceeding the set rate).

The present invention has been made in view of such a situation, and detects the output of an ATM cell to a network and controls the transmission timing of the next ATM cell to be output. In a network, an ATM cell is prevented from being discarded due to a band violation.

[0015]

According to a first aspect of the present invention, there is provided a communication apparatus for communicating with another communication apparatus connected via a network, comprising: a first dividing means for dividing a first communication signal; A first output unit that accumulates the signals divided by the first division unit and outputs the signals at a predetermined timing, a second division unit that divides the second communication signal, and a second division unit that divides the communication signal. A second output unit that accumulates the signal and outputs the signal at a predetermined timing; a first communication signal output from the first output unit; and a second communication unit output from the second output unit.
And a third output unit that controls the first output unit in accordance with the output result while controlling the output order of the communication signals.

According to a fourth aspect of the present invention, there is provided a communication method of a communication device for communicating with another communication device connected via a network, comprising: a first dividing step of dividing a first communication signal;
A first output step of accumulating the signals divided in the first division step and outputting the signals at a predetermined timing, a second division step of dividing the second communication signal, and a second division step A second output step of accumulating the output signal and outputting the signal at a predetermined timing, a first communication signal output from the first output step, and a second communication signal output from the second output step. And a third output step of controlling the first output means in accordance with the output result while controlling the output order.

According to a fifth aspect of the present invention, there is provided a communication apparatus for communicating with another communication apparatus connected via a network, comprising: a first division step of dividing a first communication signal;
A first output step of accumulating the signals divided in the first division step and outputting the signals at a predetermined timing, a second division step of dividing the second communication signal, and a second division step A second output step of accumulating the output signal and outputting the signal at a predetermined timing, a first communication signal output from the first output step, and a second communication signal output from the second output step. Providing a computer readable program for executing a process including controlling the output order and outputting the result, and corresponding to the output result, the third output step of controlling the first output means. It is characterized by.

In the communication device according to the first aspect, the communication method according to the fourth aspect, and the providing medium according to the fifth aspect, the first communication signal is divided and stored, and the divided first communication signal is stored. Is output at a predetermined output timing,
The second communication signal is divided and stored, and the divided second
Are output at a predetermined output timing, the output order of the first communication signal and the second communication signal is controlled, and the output timing of the first communication signal is controlled according to the output result. .

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below. In order to clarify the correspondence between each means of the invention described in the claims and the following embodiments, each means is described. When the features of the present invention are described by adding the corresponding embodiment (however, an example) in parentheses after the parentheses, the result is as follows. However, of course, this description does not mean that each means is limited to those described.

That is, a communication device for communicating with another communication device connected via a network according to the first aspect of the present invention comprises a first dividing means (for example, a cell shown in FIG. 5) for dividing a first communication signal. And a first output unit (for example, the traffic shaper unit 1 in FIG. 5) that accumulates the signal divided by the first division unit and outputs the signal at a predetermined timing.
4), a second dividing unit (for example, the cell unit 16 in FIG. 5) for dividing the second communication signal, and accumulating the signals divided by the second dividing unit and outputting the signals at a predetermined timing. The second output unit (for example, the traffic shaper unit 18 in FIG. 5), the first communication signal output from the first output unit, and the second communication signal output from the second output unit The output sequence is controlled and output, and a third output unit (for example, the arbiter unit 15 in FIG. 5) for controlling the first output unit in accordance with the output result is provided. .

FIG. 1 shows a configuration example of a communication system using an ATM exchange to which the present invention is applied. The personal computer 20-1 is connected via the ATM switch 21 to
Personal computer 20-2 connected there
And data communication can be performed. ATM switch 2
1 is an Ethernet (Ethernet) 2 via a router 22
3, the personal computer 20-1 and the personal computer 20-2, the personal computer 20-3 and the personal computer 20-4 connected to the Ethernet 23, and the token ring 24. The personal computer 20-5 and the personal computer 20-6 connected to the G.24 can perform data communication with each other.

In FIG. 1, the nodes connected to the ATM switch 21 to the token ring 24 are personal computers, but the connected nodes may be other devices such as a video server and a workstation. .

FIG. 2 shows the hardware configuration of the personal computer 20-1 as one node connected to the ATM exchange (not shown,
The personal computers 20-2 to 20-6 have the same configuration as the personal computer 20-1).
The CPU bus 34 includes a CPU 31 and a ROM (Read Only).
Memory 32 and a RAM 33 are connected. This CPU bus 34 is also connected to an I / O interface 35. The I / O interface 35 includes a hard disk drive (HDD) 36, a keyboard 37, and a mouse 3.
8, a display unit 39, and a communication unit 40.

The CPU 31 is a personal computer 2
It is a controller that controls each function of 0-1.
Various kinds of processing are executed according to the program stored in the memory 33. The RAM 33 stores data and programs necessary for the CPU 31 to execute various processes as appropriate. The HDD 36 is an external storage device,
Application programs and the like are stored. The keyboard 37 and the mouse 38 are operated when inputting from the outside. The display unit 39 is an LCD (Liquid Crystal Dis
play) and displays predetermined data. The communication unit 40 is connected to the ATM exchange and communicates with other devices.

FIG. 3 shows the ATM exchanges 21-1 and 21-2.
The communication unit 4 of the output side node when performing communication using
0-1 and the protocol configuration of the communication unit 40-2 of the receiving node. Communication unit 40-1 and communication unit 4
0-2 is usually constituted by an ATM board or the like.
In the communication unit 40-1, transmission data is input to the ATM adaptation layer 51-1 and is divided into 48 bytes, and is output to the ATM layer 52-1 as ATM cells. In the ATM layer 52-1, a 5-byte ATM header is added to the 48-byte divided transmission data and output to the physical layer 53-1. In the physical layer 53-1, ATM cells input from the ATM layer 52-1 are synchronized with SDH (Synchronous Digital).
Hierarchy), and if there is a vacancy in the SDH frame, empty cells are stuffed into the SDH frame, and the SDH frame is output to the ATM switch 21-1.

The communication section 40-2 of the receiving node has the same configuration as the communication section 40-1.
-2, when an SDH frame is input to the physical layer 53-2, empty cells are discarded in the physical layer 53-2, and only ATM cells containing communication information are transmitted to the AT.
Output to M layer 52-2. ATM layer 52-2
In, the ATM header added to the ATM cell is extracted and discarded, and the communication data is output to the ATM adaptation layer 51-2. In the ATM adaptation layer 51-2, the data of 48 bytes is restored to the original transmission data.

FIG. 4 is a diagram showing an example of the configuration of a communication apparatus to which a plurality of types of signals are applied, to which the present invention is applied. In the configuration example of FIG. 4, two types of communication data, ie, moving image data output from the video camera 61 and document data read from the memory 2 by the CPU 1 are output, and moving image data is output from the ATM switch 21. And the document data are received.

The moving image data output to the network is
MPEG (Moving Picture Exp) from the video camera 61
erts Group). MPEG
In the encoder 62, the moving image data is encoded by the MPEG method, and the transport stream signal (hereinafter, referred to as the transport stream signal)
SAR (Segmentati).
on and Reassembly) section 4.

The document data output to the network is C
The data is read from the memory 2 by the PU 1 and the CPU bus 3
Is input to the SAR unit 4 via the.

In the SAR unit 4, the input TS signal and document data are each divided into 48 bytes and output to the PHY unit 5 as ATM cells. PH
The operation of the Y section 5 is the same as that described with reference to FIG.

The optical link section 66 converts an electric signal into an optical signal (E / O conversion) because it is connected to the ATM switch 21 via an optical fiber. The ATM cell output from the optical link unit 66 is A
It is transmitted to another communication device via the TM exchange 21.

The received moving image data and document data are output from the ATM switch 21 to the optical link unit 66. In the optical link unit 66, the optical signal is converted into an electric signal (O / E conversion) and output to the PHY unit 5. In the PHY unit 5, signal processing depending on a specific physical layer is performed.

In the SAR unit 4, the ATM cell of the input moving image data and the ATM cell of the document data are separated for each data type, and the signal of the ATM cell unit is restored to the original continuous data. Note that the moving image data is converted into a TS signal.

In the MPEG decoder 63, the TS signal is decoded into a moving image signal. The monitor 64 displays an image of the moving image signal.

The SAR unit 4 notifies the CPU 1 of the arrival of the document data by an interrupt signal or the like. At this time, CP
U1 stores the document data in the memory 2.

The details of the SAR unit 4 will be described with reference to FIG. After the TS signal input from the MPEG encoder 62 is interface-processed in the input I / F (interface) unit 79, the FIFO unit (First I / F)
n First Out) 80. In the FIFO unit 80, the input TS signals are stored and output to the celling unit 16 in the input order.

Each time two transport packets (188.times.2 = 376 bytes) are input, the celling section 16 converts the CRC (Cyclic) of 8 bytes (= 384-376).
A Redundancy Check code (cyclic redundancy code) and a control code are added as a trailer and divided into eight ATM cell payloads (48 × 8 = 384 bytes) every 48 bytes.

The header adding unit 17 and the traffic shaper unit 18 are the same as those described with reference to FIG.

The document data is stored in the memory 2 by the CPU 1.
Is read out from the dual port RAM 11, the celling unit 12, and the header adding unit 13 and is output to the traffic shaper unit 14 as in the case described with reference to FIG. Description is omitted.

In the traffic shaper section 14, each ATM cell is accumulated until the transmission timing of each ATM cell, and the ATM cell whose transmission timing has arrived is output to the arbiter section 15. When the output ATM cell is not output from the arbiter unit 15 to the PHY unit 5,
The ATM cells are accumulated by the arbiter unit 15 until the next transmittable timing.
Output to the HY unit 5.

In the arbiter unit 15, the ATM cells input from the traffic shaper unit 14 and the traffic shaper unit 18 are selected and output to the PHY unit 5. AT of document data input from the traffic shaper unit 14
When the M cell and the ATM cell of the moving image data input from the traffic shaper unit 18 have the same transmission timing, the arbiter unit 15 outputs the AT of the moving image data.
The M cell is assigned a transmission order earlier than the ATM cell of the document data. The ATM cells of the moving image data are real-time data, and are output to the PHY unit 5 in preference to the ATM cells of the non-real-time document data.

In the PHY section 5, each ATM cell is SD
The data is packed in the H frame and communication is performed by the ATM exchange.

The moving image data and the document data input from the PHY unit 5 via the network are stored in a VC (Virtual
Channel) is input to the filter 71. In the VC filter 71, V added to the header of the ATM cell
CI (Virtual Channel Identifier) or VPI
The moving image data and the document data are separated based on (Virtual Path Identifier).

The CRC check section 75 performs a CRC check for each VCI or VPI, and if there is an error, discards ATM cells as necessary. In the packetizing unit 76, a preset PDU
(Protocol Data Unit) size is assembled.
In the case of moving image data, two transport packets (376 bytes) are restored from eight ATM cells.

In the FIFO unit 77, the transport packets are stored and output in the order of input.
In the output I / F unit 78, the TS signal subjected to the interface processing is output to the MPEG decoder 63.

On the other hand, the document data is output from the VC filter 71 and is input to the dual port RAM 74 via the CRC check unit 72 and the packetizing unit 73. The functions of the CRC checking unit 72 and the packetizing unit 73 are the same as the functions of the above-described CRC checking unit 75 and the packetizing unit 76, and thus the description is omitted here.

The dual port RAM 74 notifies the arrival of document data to the CPU 1 by an interrupt signal or the like.
When the notification is received, the dual port RAM 7
4 is read and stored in the memory 2.

Next, the moving image data and the document data are
When outputting to another communication device using the M exchange,
The operation of the communication device will be described. The moving image signal output from the video camera 61 is input to an MPEG encoder 62, encoded by the MPEG2 system, and converted into a TS signal. The TS signal is input to the FI
It is input to the FO unit 80.

The TS signal output from the FIFO unit 80 is input to the cell unit 16. Each time two transport packets (188 bytes) arrive, the cellifying unit 16 divides the two transport packets into eight ATM cell payloads and outputs the ATM cells to the header adding unit 17.
In the header adding unit 17, an ATM header is added to the payload of each ATM cell and output to the traffic shaper unit 18. In the traffic shaper unit 18, each ATM cell is accumulated (buffered) until the transmission timing of each ATM cell, and the ATM cell whose transmission timing has arrived is output to the arbiter unit 15.

The document data read from the memory 2 by the CPU 1 via the CPU bus 3 is transmitted to the dual port RA.
M11 is written. The document data written in the dual port RAM 11 is output to the cell unit 12 and
The data is divided into payloads every 8 bytes and output to the header adding unit 13. The header adding unit 13 adds an ATM header to each payload, and outputs the payload to the traffic shaper unit 14 as an ATM cell. In the traffic shaper unit 14, each ATM cell is accumulated until the transmission timing of each ATM cell, and the ATM cell whose transmission timing has arrived is output to the arbiter unit 15. If the ATM cell output to the arbiter unit 15 is not output to the PHY unit 5, the ATM cell is output to the arbiter unit 15.
Is stored in the PHY unit 5 at the next transmittable timing.
Is output to Details of this processing will be described later with reference to the flowchart in FIG.

The ATM cells input to the arbiter unit 15 are output to the PHY unit 5 in the order of the earlier transmission timing, but if there are ATM cells with the same transmission timing,
The ATM cells of the moving image data, which is real-time data, are output to the PHY unit 5 in preference to the document data, which is non-real-time data. ATM for moving image data
The cell is always transmitted at the transmission timing, and the ATM cell of the document data is transmitted after the transmission of the ATM cell of the moving image data.
Sent out.

On the other hand, when moving image data and document data are received from the ATM exchange via the network, P
In the HY section 5, physical signal processing is performed and input to the VC filter 71. The ATM cell input to the VC filter 71 includes a VCI added to the ATM cell,
Alternatively, the video data is separated into ATM cells of moving image data and ATM cells of document data based on VPI.

The ATM cells of the document data separated by the VC filter 71 are input to a CRC check section 72, where the presence or absence of an error is detected.
The TM cell is subjected to processing such as discarding. The ATM cells of the document data output from the CRC check unit 72 are assembled into a preset PDU size in the packetizing unit 73, and output to the dual port RAM 74.
It is memorized. After storing the document data, the dual port RAM 74 notifies the CPU 1 of the arrival of the document data by an interrupt signal or the like. When receiving this notification, the CPU 1
Reads the document data from the dual port RAM 74 via the CPU bus 3 and stores it in the memory 2.

The ATM cells of the moving image data separated by the VC filter 71 are subjected to the same error check and post-error processing as in the above-described CRC check section 72 in the CRC check section 75, and the packetization section 76.
Is output to In the packetizing unit 76, the payloads of the eight ATM cells of the moving image data are combined into two transport packets and output to the FIFO unit 77. The data read from the FIFO unit 77 is output to the MPEG decoder 63 via the output I / F unit 78. In the MPEG decoder 63, the TS signal is
The decoded video signal is displayed on the monitor 64.

When the ATM cell is not transmitted at the transmission timing set by the traffic shaper unit 14,
The details of the process of calculating the transmission timing again will be further described with reference to the flowchart of FIG. Step S1
In, the traffic shaper unit initializes a built-in timer for determining a transmission timing (transmission interval) for each ATM cell transmitted in order. The initialized timer counts up based on a timer increment command in step S4 described later.

In step S2, the traffic shaper unit 14 sends the non-real-time data (document data, one of the ATM cells to be transmitted this time) from the arbiter unit 15.
It is determined whether or not the cell output notification (the signal indicating that the PHY unit 5 has transmitted the ATM cell) of the cell output of the immediately preceding ATM cell (the arbiter unit 15) has been received. When the cell output notification of the non-real-time data is received, the traffic shaper unit 14 returns to the processing of step S1 and initializes a timer for calculating the transmission timing of the next transmission order ATM cell. If there is no cell output notification of non-real-time data in step S2, the process proceeds to step S3.

In step S3, the traffic shaper unit 14 determines whether or not it is the cell transmission timing (the timer has counted up until the cell transmission timing). If it is determined that it is not the cell transmission timing, the traffic shaper unit 14 determines in step S4
Then, the count value of the timer is incremented, and the process returns to step S2.

If it is determined in step S3 that it is the cell transmission timing, the process proceeds to step S5, where the traffic shaper unit 14 determines the AT of the non-real-time data.
One M cell is output to the arbiter unit 15. At that time, in order to calculate the transmission timing of the next ATM cell, the process returns to step S1, and the timer is initialized.

The processing of steps S1 to S5 is
This is repeated until all the TM cells are transmitted from the PHY unit 5 to the network. Note that the ATM cell of the real-time data is transmitted to the PHY unit 5 at the specified transmission timing prior to the ATM cell of the non-real-time data, so that the above-described calculation of the cell transmission timing is not performed again. (The traffic shaper unit 18 does not perform the processing of the flowchart of FIG. 6).

With reference to FIG. 7, the cell output state of the ATM cell whose transmission timing is controlled by the above timer processing to the PHY unit 5 will be further described. The ATM cell of the moving image data (real-time data) is represented by a square figure, and its transmission timing is time t1, time t4, and time t7. ATM cells of document data (non-real-time data) are represented by circles.
The transmission timing is from time t2 to time t6. From time t1 to time t3, since the transmission timing of the ATM cell of the moving image data and the ATM cell of the document data are not the same, each ATM cell becomes PH at each transmission timing.
It is output to Y section 5.

At time t4, the ATM of the moving image data
Since the cell and the ATM cell of the document data have the same timing, the arbiter unit 15 assigns the ATM cell of the moving image data to the ATM cell of the document data earlier and earlier than the ATM cell of the document data. Is output to the PHY unit 5 at time t4 before the ATM cell of the document data. As a result, the ATM cell of the document data is
Time t4 'is set as a timing at which transmission to the HY unit 5 is possible.
Is output to the PHY unit 5.

The transmission timing of the ATM cell of the next document data is time t5. However, since the transmission timing of the previous ATM cell is shifted from time t4 to time t4 ', time t5 is reached.
Changed to 5 '. Here, the transmission timing is time t5
From the time t5 ′ to the time t5 ′, the ATM cell is transmitted without exceeding the predetermined band, the transmitted ATM cell does not become a band violating cell, and the cell discard due to the network monitoring by the ATM switch is performed. Is prevented.

Since the previous ATM cell transmission timing is shifted to time t5 ', the next ATM cell transmission timing, time t6, is once changed to time t7. , The transmission timing of the moving image data is prioritized, and further changed to time t6 '.

AT of document data transmitted at time t6 '
The M cell is output in a band lower than the originally planned band (below the set rate), but in the case of the lower band, it is not regarded as a violating cell by traffic monitoring, and the document data is non-real-time data. Transmission (lower than the set rate) has no effect.

In the present specification, a providing medium for providing a user with a computer program for executing the above-mentioned processing includes an information providing medium such as a magnetic disk and a CD-ROM, and a network such as the Internet and a digital satellite. Transmission media is also included.

[0066]

As described above, according to the communication device according to the first aspect, the communication method according to the fourth aspect, and the providing medium according to the fifth aspect, according to the output result, Is controlled, so that by monitoring the communication status in the network, it is possible to prevent the divided signal being communicated from being discarded.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a communication system to which the present invention has been applied.

FIG. 2 is a block diagram showing a configuration of a personal computer 20-1 in FIG.

FIG. 3 is a block diagram showing a configuration of a communication unit 40 of the personal computer 20-1 in FIG.

FIG. 4 is a block diagram illustrating a configuration of a communication device to which the present invention has been applied.

FIG. 5 is a block diagram showing a detailed configuration of an SAR unit 4 of FIG. 4;

FIG. 6 is a flowchart illustrating processing of a traffic shaper unit 14 of FIG. 5;

FIG. 7 is a diagram illustrating a cell output state of a communication device to which the present invention has been applied.

FIG. 8 is a block diagram illustrating a configuration of a transmission unit of a conventional communication device.

FIG. 9 is a diagram illustrating a cell output state of a conventional communication device.

[Explanation of symbols]

1 CPU, 2 memory, 3 CPU bus, 4
SAR section, 5 PHY section, 11 dual port R
AM, 12 cell unit, 13 header addition unit, 1
4 traffic shaper section, 15 arbiter section, 1
6 Celling section, 17 Header adding section, 18 Traffic shaper section, 61 Video camera, 62 MPE
G encoder, 63 MPEG decoder, 64 monitor, 71 VC filter, 72 CRC checker, 73 packetizer, 74 dual port RA
M, 75 CRC check section, 76 packetization section, 77 FIFO section, 78 output I / F section, 7
9 input I / F section, 80 FIFO section

Claims (5)

[Claims] 1. A communication device for communicating with another communication device connected via a network, comprising: a first division unit for dividing a first communication signal; and a signal divided by the first division unit. First output means for accumulating and outputting at a predetermined timing; second dividing means for dividing a second communication signal; and accumulating the signal divided by the second dividing means, at a predetermined timing. The second communication means, the first communication signal output from the first output means, and the second communication signal output from the second output means. And a third output means for controlling the first output means in response to the output result. 2. The communication apparatus according to claim 1, wherein the third output unit controls an output order according to a priority of each of the first communication signal and the second communication signal. . 3. The communication device according to claim 1, wherein the first output unit uses a timer for controlling an output timing of the first communication signal. 4. A communication method for a communication device that communicates with another communication device connected via a network, comprising: a first division step of dividing a first communication signal; and a division step in the first division step. A first output step of storing the divided signals and outputting the signals at a predetermined timing; a second division step of dividing a second communication signal; and accumulating the signals divided in the second division step. A second output step of outputting at a predetermined timing; the first communication signal output from the first output step; and the second communication signal output from the second output step. And a third output step of controlling the first output means in accordance with the output result while controlling and outputting the output order. 5. A first division step of dividing a first communication signal into a communication apparatus that communicates with another communication apparatus connected via a network, and a signal divided in the first division step. A first output step of accumulating the signals and outputting the signals at a predetermined timing; a second division step of dividing the second communication signal; and accumulating the signals divided by the second division step, and A second output step, the first communication signal output from the first output step, and the second communication signal output from the second output step are output in the following order: A computer-readable program that controls and outputs the program and executes a process including a third output step of controlling the first output unit in accordance with the output result. Providing medium characterized.