JPH11112512A - Multi-channel receiving device, monitoring system, and reassembly method - Google Patents

Abstract

(57) [Summary] In an ATM receiving terminal, a plurality of ATM cells are connected to reassemble a service data unit (AAL-SDU) without congestion. A data buffer is provided on a processing circuit board connected to a bus and provided for each channel. The address of the data buffer is registered in the description book 412 in the host memory 42 in correspondence with the index key for each channel. Also, an index key corresponding to an empty data buffer is registered in the free queue 423 for each channel. The index key of the free queue 423 corresponding to the channel number of the receiving cell is obtained, the address of the data buffer is obtained from the description book 412, and the data service unit of the receiving cell is stored in the area corresponding to this address. I do.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a cell assembling technique in ATM communication, and more particularly, to a method and a receiving apparatus for reassembling (reassembling) data segmented on a transmitting side on a receiving side.

[0002]

2. Description of the Related Art Asynchronous transfer mode ATM communication methods for packet-multiplexing so-called multimedia such as images, voices, data, and the like, further dividing the packets into fixed-length small packets called cells, and transferring data at high speed have been studied. Has been put to practical use. In cell generation in the ATM communication method,
The celling method is classified and defined according to the service class. A class that has been put into practical use is A
There is AL5 (ATM adaptation layer type 5). Segmentation for converting data into cells on the transmission side and reassembly technology for reconstructing the original data on the reception side are abbreviated as SAR (Segmentation And Reassemble).
It is called.

FIG. 4 is a diagram for explaining the SAR of AAL5. In AAL5, a protocol data unit (PDU) is created by adding a trailer for error correction or the like as preprocessing to a service data unit (SDU) provided by an upper layer (user), and the protocol data unit (PDU) is reduced to a small size of 48 bytes. Divided into data (ATM-SDU)
A segmentation technique of adding a byte ATM header and transmitting the ATM packet as a so-called ATM cell is applied. Conversely, on the receiving side, a receiving method of removing the 5-byte ATM header from the received cell, concatenating a predetermined number of ATM-SDUs, reconstructing the PDU, and returning the SDU to the upper layer, ie, Assembling technology is applied. Reassemble the ATM cells received from the network to reconstruct the service data unit (SDU),
A multimedia receiving apparatus that distributes the SDU to a media receiving processing unit that requires the SDU is configured as shown in FIG. In FIG. 3, the multimedia receiving device 200
Is a data bus 30 for connecting each block, and AT
Network interface unit ATM-NIC 20 connected to M network 100 and performing reassembly
, A plurality of media processing units 50, 60,... For processing reconstructed SDUs, and a processing device C serving as a host processor for controlling data transfer via the data bus 30
A PU 41 and a host memory 42 for storing reconstructed SDUs are provided.

In FIG. 3, a multimedia receiving apparatus 2
00 receives an ATM cell stream from the ATM network 100. ATM cells are extracted by the physical / link layer processing unit PHY21 of the network interface unit ATM-NIC20. Next, the service data unit (S
DU) is reconfigured, and the contents of the SDU are written to the host memory 42 via the data bus unit 30. This process is executed for each of a plurality of channels (virtual path VP / virtual connection VC). The SDUs stored in the host memory are supplied to the media processing units 50, 60 and the like that require them under the control of the host CPU 41, and the respective media processing units reproduce the original information. I have.

[0005] In a conventional reassembling method in a multimedia receiving apparatus, a receiving ATM-SDU is used as described above.
Are connected to form a PDU, and all SDUs are stored on a single memory chip called a host memory in order to pass the data to an upper layer. In order to distribute the SDU to a media processing unit (which is also called a bus agent because it is an element connected to the bus), it was necessary to transfer the SDU via the data bus 30 again.
The SDU completion notification is sent to the SAR22-CPU4 shown in FIG.
The re-transfer to the media processing unit is performed under the control of the CPU 41.

[0006]

However, for example, in the case of moving image communication, when the bandwidth of the received data is larger than the transfer capability of the bus, each channel data is retransmitted to a plurality of bus agents. In cases such as multi-channel multiplex communication that must be performed, a problem of bus congestion occurs. That is, each bus agent obtains the right to use the bus and transfers broadband image data and the like to the DMA.
When trying to transfer, SAR22 → host memory 4
2. Host memory 42 → each media processing unit 50, 60 ...
However, when the data capacity is large, the bus occupation time becomes long, or when the capacity of the host memory is small, the memory overflows and congestion occurs.

[0007] As one of the methods for solving this problem,
The host memory is a dual-port memory, and a reception SD is received from a memory port (referred to as a secondary side) on the opposite side of the bus.
There is a method of delivering U to each media processing unit. With this technique, the problem of bus congestion can be solved logically.

However, in this case, the hardware configuration of the multimedia receiving apparatus is as follows. First, the data bus 30 itself serves as a backplane, which is the backbone of the device. The illustrated ATM-NIC 20, the host control circuit board 40, and the plurality of agents 50, 60,. It is configured to be slot-in to the plane. For this reason, if a dual port configuration in which the plurality of agents 50, 60,... Rereads and transfers received SDUs from the secondary side of the host memory of the host control circuit board 40 is used, the read port, connection cable, etc. Separately required, wiring is troublesome and uneconomical.

An object of the present invention is to provide a reasonable multi-channel SDU reassembling method and a multimedia / multi-channel receiving apparatus which solve the above-mentioned problem of bus congestion.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method for receiving an ATM cell to which channel identification information is added from an ATM network and comprising a plurality of ATM cells for each channel. An interface for receiving the ATM cell, detecting the identification information of the channel added to the ATM cell, and creating the service data unit for each channel in a multi-channel receiving apparatus for reconfiguring the service data unit Means, holding means provided for each channel, and having a region for holding a service data unit of the channel, processing means for processing the service data unit held by the holding means, and the service unit When the service unit is not held in the area for holding Unused area storage means for storing the area information of the area in association with the channel identification information, management means for managing the unused area storage means, and the interface means, the service data unit, Extracting means for extracting, when created, area information of the unused area storage means corresponding to channel identification information of the service data unit; and an area of the holding means corresponding to the area information extracted by the extracting means. Transfer means for transferring the service data unit; and notifying means for notifying the management means that the transfer of the service data unit is completed, together with the area information, when the transfer is completed by the transfer means. Deleting the registration of the area information extracted by the extraction means from the unused area storage means And when the notification is received from the notification means, the management means instructs the area information to the processing means, and the processing means corresponds to the area information instructed by the management means. The service data unit held in the area of the holding unit is processed, and after the processing of the service data unit, the management unit is notified along with the area information that the area of the holding unit holding the service data unit is unused. In response to the notification, when the processing unit notifies the area information, the management unit registers the area information in the unused area storage unit.

In the present invention, when a service data unit (SDU) is reconfigured, it is directly reassembled to a holding means (data buffer) which can be processed by a processing means without passing through a bus, thereby causing a problem of congestion. Has been resolved. That is, the SDU reassembly memory, which has been called a conventional host memory, is arranged as a holding means corresponding to a channel (VP / VC), and is a multi-destination for each channel.

[0012] Also, an area information storage means of the holding means for storing area information indicating an area for holding the service unit in association with search information for search, and an area information storage means for holding the service unit. In the area, when the service unit is not held, the unused area storage means for storing the search information corresponding to the area information of the area in association with the identification information of the channel, Is also good. In this case, since the search can be performed using the search information, the search time can be shortened, and the access time to the memory can be shortened.
In this case, the area information storage means (description book) stores the area information indicating the area for holding the service unit of the holding means in association with the search information (index) for search. For example, the address and capacity of the data buffer can be stored in association with the index. When the service unit is not held in the area for holding the service unit, the unused area storage unit associates the search information corresponding to the area information of the area with the channel identification information. I remember. For example, an index of a description book of an unused data buffer is stored. The notifying means, when the interface means creates the service data unit, extracts search information of the unused area storage means corresponding to the identification information of the channel of the service data unit, and the deleting means, The registration of the search information is deleted from the area storage unit. The transfer unit searches for the area information of the area information storage unit corresponding to the search information, and transfers and holds the service data unit to an area of the holding unit corresponding to the area information. The notifying unit notifies the management unit that the transfer of the service data unit is completed, together with the search information, and the management unit responds to the search information when the notification is received from the interface unit. A search is made for the area information of the area information storage means, and the area information is instructed to the processing means together with the search information, and the processing means stores the area information in the area of the holding means corresponding to the area information specified by the management means. Processing the service data unit to be held, and after processing the service data unit, notifies the management unit of search information corresponding to an area of the holding unit that holds the service data unit;
When the search information is notified, the management unit can register the search information in the unused area storage unit.

The unused area storage means may be a queue for storing the search information for each of the channel identification information.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a system configuration diagram according to the embodiment of the present invention. FIG. 1 shows a configuration diagram including a data structure according to the embodiment of the present invention.

FIG. 2 shows an overall configuration in a case where a multipoint monitoring system is constructed by connecting a multimedia transmitting / receiving system for image and voice using an ATM network to the ATM network. In FIG. 2, monitoring sites A, B,..., X for transmitting ATM cells are scattered, and each monitoring site includes a transmitter for encoding and transmitting monitoring information such as video and audio. Transmission data is AT
It is converted into an M cell and transmitted to the ATM network 100. On the other hand, the multimedia / multi-channel receiver 200
Is a monitoring center, which is connected to the ATM network, sorts, receives, and decodes monitoring signals transmitted from each monitoring site, and displays and outputs decoded video, audio, and the like for each monitoring site. The monitoring signal includes, for example, traffic congestion information of each area such as traffic information and a monitoring video.

At each of the monitoring sites A, B,..., X, video is encoded by a compression encoding circuit VENC, audio is encoded by AENC, and multiplexed by a media multiplexing circuit MUX. The multiplexed data is cellized by a segmentation circuit (SAR) as a service data unit (SDU) and transmitted to an ATM network through a transmission link physical layer (PHY).
At this time, the transmission cells from the monitoring sites A, B,..., X are provided with different channel identification information as virtual line labels, that is, VPI / VCI channel numbers, for each channel.

The monitoring center 200 receives the monitoring information transmitted from the monitoring site, detects the VPI / VCI channel number of the channel identification information added to the monitoring information, and provides a service for each channel. ATM-NIC 20 of interface circuit for creating data unit
And a processing circuit that is provided for each channel and includes a data buffer memory for holding the service data unit of the channel, and that processes the service data unit held in the data buffer memory and outputs monitoring information. , A host CPU 41 having a host memory 42, and an ATM-NIC 2
0, each of the decoding circuits 50, 60,.
And a bus 30 for connecting

The ATM-NIC 20 in the monitoring center 200
The physical link layer PHY 21 receives multiplexed signals of a plurality of lines. Receive SAR circuit 22
Is the channel number of each VCI / VCI (a, b,
.., X), an SDU is created from a plurality of cells for each bus 3
0, the data is burst-written directly to the data buffer memories 51 of the decoding circuit corresponding to the channel number. That is, the SDU is reassembled on the data buffer of the decoding circuit corresponding to the channel number. The reception data buffer memories 51 in the plurality of decoding circuits 50, 60,...
The DU is written, and the SDU written from the secondary side is read. The multimedia separation circuit DMUX52
The video packet and the audio packet are separated, and the original video / audio information is restored by the respective decoding circuits VDEC53 and ADEC54. The host control circuit board 40 is a bus control circuit, and includes a host CPU 41 and a host memory 42. In the host memory, a two-dimensional free queue data structure for enabling multi-destination reassembly is allocated. ing.

In terms of physical structure, the ATM-NI
The C20, the bus control circuit 40, the decoding circuits 50, 60, etc. are independent boards and have a structure in which the bus 30 is held as a backplane. The decryption circuit board is provided for the monitoring site, which facilitates expansion and maintenance.

Next, a multi-destination reassembling method will be described with reference to FIG. In the multimedia / multi-channel receiving apparatus according to the present embodiment, a memory structure is shown in detail in FIG. 1 in order to explain a multi-destination reassembling mechanism.

Referring to FIG. 1, a multimedia / multi-channel receiver 200 includes a bus 30 which is a logical and physical skeleton of a device. As the bus 30, a PCI bus, which has been remarkably developed in recent years, can be used.
ATM-N transmission interface board across bus 30
An IC 20, a host control circuit board 40, and an image / sound decoding circuit board 50 are arranged. ATM-NIC20
Are the physical link layer processing circuit PHY21, the SAR layer processing circuit 22, and the bus interface circuit BUSI
F23 is provided. The SAR layer processing circuit 22
Processor 221, data buffer 222, DMA controller 223, and connection table memory 22
4 is provided.

The host control circuit board 40 includes a host CPU
41 and a host memory 42. The host memory 42 has, as a memory structure, a description book 421 for storing, for each channel number, an address and a capacity, which are area information, of a data buffer of a decoding circuit in association with an index key of search information for search. A queue memory for storing an index key for searching for such a description book, wherein a ready queue RQ422 for storing an index key corresponding to the data buffer being used.
And a free queue F for storing an index key corresponding to an unused data buffer for each channel number.
Q423.

The video / audio decoding circuit board 50 includes a data buffer memory 51, a multimedia packet separation circuit D
MUX52, image decoder VDEC53, audio decoder ADEC54, bus interface circuit BUSIF55
And a memory read control circuit 56.

The data buffer memory 51 is a space-divided destination memory, provided for each channel, in which at least two data buffers 511 are allocated. One data buffer 511 holds one SDU. The number of data buffers is determined by the throughput of the bus 30.

Similarly, a plurality of additional boards 60 are provided with data buffer memories 61, and a plurality of data buffers 611 are allocated so as to hold at least two SDUs.

When creating the SDU, the ATM-NIC 20 extracts the index key stored in the free queue 423 corresponding to the channel number of the SDU,
The registration of the index key is deleted from the free queue 423, the index key is registered in the ready queue 422, and the description book 4 corresponding to the index key is deleted.
The address and size stored in 21 are searched,
In the area of the data buffer corresponding to this address,
U, and notifies the host CPU 41 of the completion of the SDU transfer together with the index key.
Upon receiving the completion notification from the ATM-NIC 20, the host CPU 41 searches the address stored in the description book corresponding to the index key, and instructs the decoding circuit corresponding to the address and the index key to the decoding circuit corresponding to the channel number. I do. The decoding circuit decodes the SDU held in the data buffer area corresponding to the address specified by the host CPU 41, and outputs the decoded monitoring signal, and then corresponds to the data buffer area holding the SDU. The host CPU 41 is notified of the index key to be executed. When notified of the index key, the host CPU 41 stores the index key in the ready queue 42.
2 and the index key is registered in the free queue 423.

Next, before the operation is described, the memory allocation will be described. In the PCI bus system, immediately after the system is turned on, software called a system initialization BIOS stored in the initialization program storage unit 450 executes the PCI bus configuration. With this configuration, all memory resources of the system are mapped in the memory space. In FIG. 1, the agents 20, 40, 5
Map the memory space required by each of 0, 60... To a single memory space. Therefore, the data buffer memories 51, 61,... Are allocated to a single memory space. Each of the decoding circuits 50, 60,... Is provided in advance corresponding to the channel number, and the data buffer memories 511, 61 in the data buffer memories 51, 61.
The start addresses and capacities of 1... Are set in the initialization program in advance.

In the PCI bus system, the boards 50, 60
Are physically fixed, the mapping of the base address by the PCI configuration is uniquely determined. After mapping, the mapped base address is read by the initialization application software,
Each of the data buffer memories 51, 61,... Is assigned a destination number (DST. = 1, 2,...). This destination number can uniquely correspond to the physical mounting position of the board, and corresponds to the channel number. Therefore, in the present embodiment, a destination number (DST) corresponding to a channel number is used instead of the channel number itself.

In this way, the plurality of data buffer memories are mapped in the memory space, and the destination numbers are assigned according to the physical mounting positions of the agents.

The PCI configuration of the host memory is similarly executed on the host control circuit board 40. Thereafter, the apparatus initialization application software allocates the description book DT421, ready queue RQ422, and free queue FQ423 on the host memory.

FIGS. 5 to 7 show specific examples of the contents of the description book DT421, ready queue RQ422, and free queue FQ423.

In FIG. 5, the description book DT421 stores the address and capacity of the data buffer of the decoding circuit for each DST number in association with the index key. For example, in FIG. 5, an index key 00 to an index key 05 are assigned to DST0 (corresponding to the decoding circuit 50), and an address and a capacity are stored in correspondence with each index key. An index key is provided corresponding to each of the data buffers 511 and 611. In this case, the address and size of the data buffer 511 are stored in association with the index key 00. The address and size of each data buffer are set in the initialization program in advance. When searching, the search can be performed using the index key. The description book DT421 may have a one-dimensional configuration, but in FIGS. 1 and 5, the description book DT421 is expanded to correspond to the destination and is displayed in a two-dimensional manner for easy understanding.

In FIG. 7, the free queue FQ4
Reference numeral 23 stores an index of an unused data buffer in association with the destination. For this reason,
The queue memory is two-dimensionally configured for the destination. When creating the SDU, the ATM-NIC 20 extracts the index key stored in the free queue 423 corresponding to the destination number of the SDU from the beginning,
23, the registration of the index key is deleted. For example, when creating an SDU corresponding to DST0,
The ATM-NIC 20 extracts the index key 00 corresponding to DST0 and deletes the registration of the index key 00. After processing in each decoding circuit, the host C
The unused index key is registered in the free queue 423 by the PU 41.

In FIG. 6, the ready queue RQ4
Reference numeral 22 stores the key index of the currently used data buffer. The ready queue RQ422 may be a queue and may have a one-dimensional configuration. The registration of the index to the ready queue RQ422 is performed by the ATM-NIC.
20 is performed when an SDU is created and an index key stored in the free queue 423 is extracted and deleted. The ready queue 423 is used when it is necessary to refer to the used index. However, the ready queue 423 may not be provided if it is not necessary to refer to the used index.

On the other hand, the SAR on the ATM-NIC substrate 20
22, a connection table 224 is prepared. Here, the initialization application software initializes which output destination (destination) data buffer memory corresponds to the channel number of the virtual connection VPI / VCI. The connection table 224 stores the number of the corresponding data buffer memory for each channel. Since there is a one-to-one correspondence between the channel and the data buffer memory, the channel number may be used as the destination as it is. In this case, the connection table 224 need not be provided.

After the initialization of the other component image / speech decoding circuits and the like, the multimedia / multi-channel receiving apparatus starts the reception processing.

Hereinafter, the receiving process will be described. The signal received from the ATM network is terminated at the PHY 21, and the transmission frame is recovered and the ATM cell delineation is performed. A VCI is identified, extracted and filtered
The TM cell is stored in the corresponding VC by the AAL processor 221.
The SDU is reconstructed for each I and written into the buffer memory 222. As shown in FIG. 4, the SDU reconfiguration is configured by deleting the headers of a plurality of ATM cells and connecting these ATM cells. The number of ATM cells is described as a length in a predetermined area of the ATM cell, and is fixedly predetermined in the system, for example, 8 cells. Buffer memory 22
Reference numeral 2 also serves to buffer the throughput between the transmission line side and the bus 30 side.

On the other hand, the connection table 224 is looked up with the identified VCI number, and a destination number (DS) preset for each VCI is set.
T. = J) is extracted. The DMA controller 223 of the PCI bus has a transfer capability as a bus master. When transferring the SDU in the buffer memory 222 to the destination, first, the DST. = J, the index key is obtained from FQ (j) of the free queue FQ423 on the host memory 42. The description book is searched by this index key. The description book contains the destination SD in advance.
U data buffer memory buffer start address
The buffer size and the like are described. By this operation,
The data buffer start address and size in the destination memory intended for VCI can be known, and the DMA controller 223 burst-writes the SDU stored in the buffer 222 from the searched buffer start address. When the writing of one SDU is completed, the DMA controller transmits the index key to the ready queue RQ4 as a completion notification.
22 and the host CPU 41
Notify the index key. The host CPU 41
By this interruption, the area corresponding to the index key of the description book 421 is referred to, the start address and the buffer size of the received data buffer are extracted, and the start address and the size together with the index key are stored in the secondary reading circuit 56 of the memory. Transfer and prompt SDU reading. The SDU to be read is a multimedia multiplexed data packet, which is demultiplexed by the demultiplexer DMUX52, demodulated into the original video signal and the original audio signal by the decoders VDEC53 and ADEC54, and output to an external display device. After processing the SDU, the secondary side reading circuit 56 notifies the designated index key to the host CPU 41. When notified of the index key, the host CPU deletes the index key from the ready queue 422 and registers it in the free queue 423.

As described above, multi-channel SDUs are directly reassembled for each destination via the bus.

According to the present embodiment, a data buffer for storing AAL-SDU is divided in space for each destination, a destination number is assigned, and a reception connection table is used to determine a destination VPI / VCI channel number. Since the destination number is made to correspond and the empty buffer of the target destination is obtained from the two-dimensional free queue memory corresponding to this destination number, the reception AAL-
A rational method is obtained in which the SDU can be separated from the SAR mechanism and written directly to the destination memory via the bus. This method has the advantage of minimizing the data transfer time on the bus (because rereading by the bus agent is avoided) and solving the congestion problem on the bus. When the agent hanging on the bus is configured for each board, the board can be added smoothly. There is no need for a local connection cable for bridging the extension board from the host memory, and a neat device mounting configuration is possible.

In this embodiment, the host control circuit board 40 is provided with the description book 421, the ready queue RQ422, and the free queue FQ423 in order to manage the data buffer. May be provided on the transmission interface board ATM-NIC 20. In this case, the ATM-NIC 20 is provided with a memory to manage the data buffer.

[0042]

As described above, according to the present invention,
Retransmission of SDU data on the bus can be avoided, thereby solving the problem of congestion in the bus transfer capability. Alternatively, it is possible to efficiently increase the number of agent boards in a mounting configuration of a device using a bus as a backplane.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a multipoint monitoring system according to an embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional multimedia multi-channel receiving device.

FIG. 4 is an explanatory diagram of mutual conversion between a multimedia packet and an ATM layer cell.

FIG. 5 is an explanatory diagram showing the contents of a description book.

FIG. 6 is an explanatory diagram showing the contents of a ready queue.

FIG. 7 is an explanatory diagram showing the contents of a free queue.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 ... ATM network 200 ... Multimedia multi-channel receiver 20 ... ATM network interface circuit board 30 ... PCI bus circuit 40 ... Host control circuit board 50,60,70,80 ... Video / audio decoding circuit board 21 ... Physical link Layer processing circuit 22 ... ATM adaptation layer processing circuit 23 ... Bus interface circuit 221 ... ATM adaptation layer processor 222 ... Buffer memory 223 ... DMA controller 224 ... Connection table memory 41 ... Host CPU 42 ... Host memory 421 ... Data buffer description book 422 ... Ready queue memory 423 Free queue memory 51, 61 Data buffer memory 511 Data buffer 52 Multimedia packet separation circuit 53 Video decoder circuit 54 ... audio decoder circuit 55 ... bus interface circuit 56 ... memory read control circuit 450 ... initialization program storage unit.

Claims (5)

[Claims] 1. A multi-channel receiving apparatus for receiving an ATM cell to which channel identification information is added from an ATM network, and reconstructing a service data unit composed of a plurality of ATM cells for each channel. Interface means for receiving an ATM cell, detecting the identification information of the channel added to the ATM cell, and creating the service data unit for each channel, and service data for the channel provided for each channel. Holding means having an area for holding the unit, processing means for processing the service data unit held in the holding means, and when the service unit is not held in the area for holding the service unit Then, the area information of the area is associated with the identification information of the channel. An unused area storage means for storing and storing the unused area storage means, and a management means for managing the unused area storage means, the interface means corresponding to the identification information of the channel of the service data unit when the service data unit is created. Extracting means for extracting area information of the unused area storing means, transferring means for transferring the service data unit to an area of the holding means corresponding to the area information extracted by the extracting means, and transferring means When the transfer is completed, the notifying means for notifying the managing means that the transfer of the service data unit has been completed, together with the area information, and the registration of the area information extracted by the extracting means, Deleting means for deleting the unused area from the unused area storage means; If there is, the area information is instructed to the processing means, and the processing means processes the service data unit held in the area of the holding means corresponding to the area information instructed by the management means, After processing the service data unit, the management unit notifies the management unit that the area of the holding unit that holds the service data unit is unused, together with the area information, and the management unit notifies the processing unit of the area information. The multi-channel receiving apparatus registers the area information in the unused area storage means when the operation is performed. 2. A multi-channel receiving apparatus for receiving an ATM cell to which channel identification information is added from an ATM network, and reconstructing a service data unit composed of a plurality of ATM cells for each channel. Interface means for receiving an ATM cell, detecting the identification information of the channel added to the ATM cell, and creating the service data unit for each channel, and service data for the channel provided for each channel. Holding means having an area for holding a unit, processing means for processing a service data unit held in the holding means, and the holding means, area information indicating an area for holding the service unit, Area information storage means for storing in association with search information for search; A region for holding the over screw unit, when the service unit is not held, the search information corresponding to the region information of the region,
An unused area storage unit that stores the service data unit in association with the channel identification information; a management unit that manages the unused area storage unit; and the service data unit when the interface unit creates the service data unit. Extracting means for extracting search information of the unused area storage means corresponding to the identification information of the channel, and searching for area information of the area information storage means corresponding to the search information extracted by the extraction means; A transfer unit for transferring the service data unit to an area of the holding unit corresponding to area information, and when the transfer is completed by the transfer unit, the management unit, together with the search information,
Notification means for notifying that the transfer of the service data unit has been completed, and deletion means for deleting the registration of the search information extracted by the extraction means from the unused area storage means, wherein the management means Receiving the notification from the notifying unit, searches the area information of the area information storage unit corresponding to the search information, and instructs the processing unit along with the search information to the area information, the processing unit includes: The service data unit held in the area of the holding unit corresponding to the area information instructed by the management unit is processed, and after the processing of the service data unit, the area of the holding unit holding the service data unit is not stored. The management unit is notified that the search information is used together with the search information, and the management unit, when notified of the search information, Multi-channel receiver and registers the search information in the unused area storage means. 3. The multi-channel receiving apparatus according to claim 2, wherein said unused area storage means is a queue for storing said search information for each channel identification information. apparatus. 4. Monitoring information to which channel identification information is added is received from an ATM network.
In a monitoring system that reconfigures a service data unit composed of a plurality of pieces of monitoring information, processes the service data unit, and outputs monitoring information, the monitoring information is received, and the channel of the channel added to the monitoring information is received. An interface device for detecting identification information and creating a service data unit for each channel; and a buffer provided for each channel and holding a service data unit for the channel, wherein a service held in the buffer is provided. A processing device that processes a data unit and outputs the monitoring information, a management device including a memory and a CPU, the interface device, each of the processing devices, and a bus that connects the management device; The management device holds the service unit in the buffer. A table for storing area information indicating an area for search in association with search information for search, and an area for holding the service unit, when the service unit is not held, A free queue that stores the corresponding search information in association with the identification information of the channel is provided in the memory,
The interface device, when creating the service data unit, extracts the search information of the free queue corresponding to the identification information of the channel of the service data unit, deletes the registration of the search information from the free queue, The area information of the table corresponding to the search information is searched, the service data unit is held in the area of the buffer corresponding to the area information, and the management device is provided with the search information together with the search information. Notifying that the transfer has been completed, the management device, upon receiving the notification from the interface device,
The area information of the table corresponding to the search information is searched, and the area information is instructed to the processing device together with the search information, and the processing apparatus corresponds to the area information instructed by the management apparatus. Processing the service data unit held in the buffer area, and after outputting the monitoring information, notifies the management device together with the search information that the buffer area holding the service data unit is unused; A monitoring system, wherein, when the processing device is notified of the search information, the management device registers the search information in the free queue. 5. An ATM cell to which channel identification information is added from an ATM network, and a service data unit composed of a plurality of ATM cells for each channel is reconfigured and provided for each channel. A reassembly method in a multi-channel receiving apparatus that causes a holding unit to hold the service data unit, wherein area information indicating an area for holding the service unit of the holding unit is used as search information for search. When the service unit is not held in the area for holding the service unit, the search information corresponding to the area information is stored in association with the channel identification information. Receiving the ATM cell, detecting the identification information of the channel added to the ATM cell, A service data unit is created for each channel, the stored search information corresponding to the identification information of the channel of the service data unit is extracted, registration of the search information is deleted, and the stored A search is made for area information corresponding to search information, and the service data unit is transferred and held in an area of the holding means corresponding to the area information, and when the transfer of the service data unit is completed, the storage is performed. Searching for the area information corresponding to the search information, processing the service data unit held in the area of the holding unit corresponding to the area information, and processing the service data unit after processing the service data unit. A reassembly method comprising storing search information corresponding to an area of a holding means for holding.