JPH11145981A - Atm duplex device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ATM(asynchronous transfer mode) duplex device capable of periodically maintaining both an operation system/a standby system and improving a device service life and device quality. SOLUTION: In this ATM duplex device, a cell disassembly part for disassembling ATM cells is duplexed by a 0 system device 100 composed of a write control part 110, a RAM- 0 system 120 for data storage and a read control part 130 and a 1 system device 200 composed of the write control part 210, a RAM- 1 system 220 for the data storage and the read control part 230. The write control parts 110 and 210 are provided with an information informing function with the other system for writing cell data to the same address position at the time of changeover of the operation system/the standby system and the read control parts 130 and 230 are provided with the information informing function with the other system for reading the same address position and a judgement part for defining that the transmission user data of the present system and the other system match and judging changeover end at the time of reading a write changeover start address by the changeover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an STM (Synchronous
ous Transfer Mode: Synchronous transfer mode network and ATM (Asy)
In a communication network including an nchronous transfer mode (asynchronous transfer mode) network, information is transmitted in fixed-length packets (hereinafter, referred to as “packets”).
More particularly, the present invention relates to an ATM duplexer having an improved method of switching from an active system to a standby system when disassembling an ATM cell.

[0002]

2. Description of the Related Art As a means for realizing multimedia communication, ATMs are considered to be promising.
ea Network).

[0003] In the ATM communication system, data is transmitted and received by dividing a data string of information into fixed-length data blocks called cells. The ATM communication system is characterized in that a line is efficiently used by multiplexing cell data input from various routes.

[0004] As a conventional apparatus of this type, for example, "F
Investigation of a redundant device with DDI repeater function "
(Technical REPORT OF IEICE.SSE92-170)
Are disclosed.

[0005] The devices described in the above documents include existing devices (S #) such as PB # and TD # and AT # networks and A # devices (A #).
TΜ).

Conventionally, in this type of apparatus, as shown in FIG. 16, after receiving an ATM cell, cell processing is performed and only a series of processing is performed during transmission of user data (STM data or the like). I wasn't.

[0007]

However, in such a conventional ATM device, once the device has been started, the state must be maintained in any case, resulting in satisfactory maintenance and operation. Was not something I could do.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ATM duplex apparatus which can perform maintenance (maintenance) of both the operation system and the standby system at regular intervals and can improve the life and quality of the apparatus. And

[0009]

An ATM duplexer according to the present invention has an ATM duplex system in which a cell disassembly unit for performing A @ M cell disassembly is duplicated and the cell disassembly unit is switched to an operation system / standby system for use. An apparatus for writing data to the same address position while performing write control on a data storage memory in which an area is secured for each cell data and a memory and switching between an active system and a standby system. A light control unit having an information notification function unit with another system,
A read control unit having information notification function means for performing read control on the memory and reading the same address position with the other system, and transmitting the write switch start address by switching to the own system and the other system. A determination unit that determines that switching has been completed when the user data matches.

[0010] The ATM duplexer according to the present invention has an AΤM
An AT in which a cell disassembly unit for performing cell disassembly is configured to be duplicated, and the cell disassembly unit is switched to an operation system / standby system for use.
An M-duplex device, wherein a plurality of data areas, each of which has an area secured for each cell data, is defined as one channel area, a data storage memory having a plurality of the channel areas, a write control for the memory, and an operation system. When switching the standby / standby system, a write control unit having an information notification function unit with another system for writing cell data at the same address position even when a valid cell of any channel is received, and a read control for the memory. A read control unit having an information notification function unit for reading the same address position with another system, and a channel switch for judging the end of switching in units of channels when reading a write switching start address by switching the corresponding channel. An end determination unit and a switch end determination unit that determines that switching of all preset channels has been completed. The features.

[0011] The information notification function means of the light control unit includes:
Even if the received cell data is written at the same address position as the other system by making the write information of the other system available, and the received cell data is written, the other system is notified of the written address position as the write information. Good.

The information notification function means of the read control unit includes:
The read address of the other system may be made available, the same address position as that of the other system may be read, and after reading the data, the other system may be notified of the read address position as the read information.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An ATM duplexer according to the present invention can be used with an STM network such as an existing device (PBX or TDM) and an ATM.
The present invention can be applied to an ATM duplex apparatus having an ATM decomposing function for connecting a network and decomposing ATM cells.

First Embodiment FIG. 1 is a diagram showing an entire configuration of an ATM duplex device according to a first embodiment of the present invention.

In FIG. 1, reference numeral 10 denotes an ATM device in which a cell decomposing unit for decomposing AΤM cells is duplicated.
The TM device 10 is a 0-system device 20 that performs an ATM decomposition process.
And the first system device 30 for performing the ATM decomposition processing, and the zero system device 2
And a selector 40 for selecting a transmission output of 0 and a transmission output of the first apparatus 30 and outputting the selected data as user data.

The 0-system device 20 transmits a cell reception_0 system unit 21 for receiving ATM cells, a cell disassembly_0 system unit 22 for disassembling the received ATM cells, and the disassembled cells as user data (such as STM data). It comprises a user data transmission_0 system section 23.

Similarly, the first system device 30 includes a cell receiving_1 system unit 31 for receiving an ATM cell, a cell disassembling_1 system unit 32 for disassembling the received ATM cell, and user data for transmitting the disassembled cell as user data. Transmission_1 system part 3
3

The system configurations of the 0-system apparatus 20 and the 1-system apparatus 30 are the same, one of which is an active system and the other is a standby standby system.

As described above, the portion for performing the AΤM cell decomposition has a duplex configuration of the 0-system device 20 and the 1-system device 30. In the active system device, after receiving the ATM cell, the cell is decomposed to receive the ATM cell. A series of processes are performed while sending data (such as STM data). That is, since the A @ M cell disassembly function unit has a dual configuration of the active system and the standby system, maintenance and the like can be performed in the other standby system while the active system is being started and operated.

This embodiment is characterized by a method of switching from the active system to the standby system when disassembling the ATM cells. The basic configuration of the active / standby system will be described below in detail.

FIG. 2 shows an AT according to the first embodiment of the present invention.
FIG. 3 is a diagram showing a basic device configuration of the M duplex device, wherein the upper part of the broken line in FIG.

In FIG. 2, reference numeral 100 denotes a 0-system device;
Is a system 1 device, and the system 0 device 100 is a light control unit 1
10, a data storage RAM_0 system 120 and a read control unit 130. The first system device 200 includes a write control unit 210, a data storage RAM_1 system 220, and a read control unit 230.

The 0-system apparatus 100 and the 1-system apparatus 200
Since the configuration is the same, description will be made by taking the 0-system apparatus 100 as an example.

From the ATM cell, the payload data is extracted by the reception processing, and is delivered to the data storage RAM_0 system 120 as the reception cell data_0 system. From the reception process, a valid cell reception signal is passed to the write control unit 110.

The write control section 110 has a write address_
0 system and write control signal_0 system are stored in RAM_0 for data storage.
Output to the system 120. Further, the light control unit of the own system (for example, the light control unit 110) receives the write information_1 system output from the light control unit of the other system (for example, the light control unit 210).

The read control unit 130 receives the TS information and the write information_0 system output by the user data transmission processing. Further, the read control unit of the own system (for example, the read control unit 130) receives the read information_1 system output from the read control unit of the other system (for example, the read control unit 230).

The read control unit 130 has a read access_
0 system and read control signal_0 system are stored in RAM_0 for data storage.
Output to the system 120. As a result, the data storage R
The AM_0 system 120 transmits the transmission user data_0 system.

Here, the light control unit 2 of the first system 200
10, the data storage RAM_1 system 220 and the read control unit 230 have the same configuration.

FIG. 3 is a diagram showing the configuration of the data storage RAM. The data storage RAM_1 system 120 and the data storage RAM_1 system 220 have the same configuration.

As shown in FIG. 3, a data area for one cell is allocated. FIG. 3 shows an example in which data of one cell is allocated to a 64-byte area. In practice, the data area of one cell can be arbitrarily set.

FIG. 4 is a diagram showing the configuration of the write control units 110 and 210. The light control units 110 and 210
Since they have the same configuration, a description will be given using the write control unit 110 as an example.

In FIG. 4, a write control unit 110 includes a memory 111, a select condition determination circuit 112, a selector 1
13, an address conversion circuit 114, a write timing adjustment circuit 115, and a write control signal generation circuit 116.

The memory 111 stores cell area information that was previously written.

The select condition judging circuit 112 has an operation system /
The selection condition is determined based on the state of the standby system and the presence or absence of the switching signal.

The selector 113 selects the cell area information stored in the memory 111 and the write information from another system (here, the write information_1 system) based on the determination result of the select condition determination circuit 112.

The address conversion circuit 114 converts the selected information into an address of a cell area to be written next,
Output as a write address (write address_0 system).

The write timing adjustment circuit 115
Performs write timing adjustment using the valid cell reception signal.

The write control signal generation circuit 116 generates a write control signal (write control signal_0 system) based on the valid cell reception signal whose timing has been adjusted.

FIG. 5 is a diagram showing the configuration of the read control units 130 and 230. The read control units 130 and 230
Since they have the same configuration, the read control unit 130 will be described as an example.

In FIG. 5, the read control unit 130
S information table 131, TS information correction circuit 132, memory 133, select condition determination circuit 134, selector 13
5, address conversion circuit 136, switching end determination circuit 13
7, a read timing adjustment circuit 138 and a read control signal generation circuit 139.

The TS information table 131 stores TS information of user data as a table.

The TS information correction circuit 132 corrects the read information of the other system (including the TS information) based on the TS information table 131, and stores the TS information during the reception of the information of the other system in the memory 133.
Output to

The memory 133 stores the cell area information at the position where the reading of one cell of data has been completed based on the corrected information.

The select condition judging circuit 134 has an operation system /
The selection condition is determined based on the state of the standby system and the presence or absence of the switching signal.

The selector 135 receives the cell area information stored in the memory 133 based on the determination result of the select condition determination circuit 134 and the information (here, the read information_1 system) obtained by correcting the TS configuration between the reception of the information of the other system. Select

The address conversion circuit 136 converts the selected information into an address of a cell area to be read next.
Output as a read address (read address_0 system).

The switching end determination circuit 137 knows the start of the switching operation based on the selection condition determination from the selection condition determination circuit 134, determines the switching end from the write information and the read information, and outputs a switching end signal.

The read timing adjustment circuit 138
Performs read timing adjustment according to a user data transmission request signal.

The read control signal generation circuit 139 generates a read control signal (read control signal_0 system) based on the timing-adjusted user data transmission request signal.

The operation of the above-described ATM duplexer will now be described.

[Overall Operation] Taking the 0-system apparatus 100 as an example,
The operation will be described.

As shown in FIG. 1, the payload data of the ATM cell is extracted by the reception processing in the cell reception_0 system unit 21 of the 0-system apparatus 20 and delivered to the cell disassembly_0 system unit 22 as the reception cell data_0 system. . The processing at the time of cell disassembly is shown by the 0-system apparatus 100 in FIG.

The payload data is extracted by the above-described reception processing, and the data storage RA is used as the reception cell data_0 system.
Delivered to the M_0 system 120. From the reception process, a valid cell reception signal is passed to the write control unit 110.

Further, the write control unit 110 outputs the write address_0 system and the write control signal_0 system to the data storage RAM_0 system 120. Further, the write control unit 110 of the own system receives the write information_1 system output from the write control unit 210 of the other system.

The read control unit 130 receives the TS information and the write information_0 system output by the user data transmission processing, and the read control unit 130 of the own system transmits the read information_1 output by the read control unit 230 of the other system. Receive the system.

Further, the read control unit 130 outputs the read access_0 system and the read control signal_0 system to the data storage RAM_0 system 120. As a result, the data storage RAM_0 system 120 stores the transmission user data_0
Send the system.

[Operation of Each Part] FIG.
It is a flowchart which shows the flow of operation of 0,210,
ST indicates each step of the flow. Light control unit 11
Since the operations 0 and 210 are the same operation, the operation flow of the write control unit 110 of the 0-system apparatus 100 is taken as an example.

First, it is determined in step ST1 whether a valid cell has been received. If a valid cell has been received, it is determined in step ST2 whether the own system is the active system and the other system is the standby system (own system = operating system). System, other system = standby system).

When the own system is the active system and the other system is the standby system, in order to continue the write operation in the current active system, the received cell data is written in the area next to the one previously written in step ST3, and the process proceeds to step ST1. Return The next valid cell is received.

The own system is a standby system and the other system is an active system (own system =
When the standby system and the other system = operating system), the own system is the standby system, so it is determined whether or not a switching signal has been generated in step ST4. Performs the same write operation as when the system is active.

When the switching signal is generated in step ST4, the cell data is written in step ST5 according to the other system write information. At this time, the same cell data is written to the same position (address) in both the own system and the other system.

Next, in step ST6, the write start position is displayed by switching, and the process returns to step ST1 to receive the next valid cell. Specifically, it notifies the read control unit 130 of the write switching start address and performs the next valid cell reception.

As described above, first, the write control unit 110 receives a valid cell, and if the own system is the active system, writes the received cell data in the area next to the area where the previous cell was written. Also,
If the own system is the standby system, it is checked whether or not a switching signal has been generated. If the switching signal has not been generated, the same operation as in the case where the own system is the active system is performed.

When the switching signal is generated, the received cell data is written at the same position as the other system by using the write information of the other system. When the receiving cell is written to the same position (address) in both the own system and the other system, the position (address) is notified to the read control unit 130.

In particular, using the switching signal as a trigger, write data to the data storage RAM 120 is prepared using write information and read information (including TS information) from another system, and a read control unit 130 described later with reference to FIG. By adjusting the read position by operation, the transmission user data of the own system and the transmission user data of the other system are matched.

FIG. 7 is a flowchart showing the operation flow of the read control units 130 and 230. The write control units 130 and 230 have the same operation and take the flow of the operation of the read control unit 130 of the 0-system apparatus 100 as an example in order to correspond to the operation of the write control unit 110.

First, in step ST11, the data storage R
It is determined whether a certain amount of cell data has been stored in AM 120. Here, the certain amount is a predetermined value that can be arbitrarily determined by the user.

When a certain amount of cell data is stored in the data storage RAM 120, it is determined in step ST12 whether the own system is the active system and the other system is the standby system (self system = operating system, other system =
It is determined whether it is a standby system or not.

If the own system is the active system and the other system is the standby system, the next data position read last time is read in step ST13 in order to continue the read operation in the current active system, and one cell area is read in step ST14. It is determined whether or not the data read has been completed. If the data read of one cell area is not completed, the read of step ST13 is repeated until the data read of one cell area is completed.

When the data read of one cell area is completed, the read cell area information and the TS information at the position are output to another system in step ST15, and the process returns to step ST11 to store a fixed amount of cell data in the data storage RAM 120. I do. Here, the TS indicates the number of the data position from the head (reference) signal of the user data as shown in FIG.

On the other hand, in step ST12, the own system is the standby system and the other system is the active system (own system = standby system, other system = active system).
In this case, since the own system is the standby system, it is determined in step ST16 whether or not a switching signal has been generated. If no switching signal has been generated, the process proceeds to step ST13, where the same read as in the case where the own system is the active system is performed. Work.

When a switching signal is generated in step ST16, data in a position corresponding to the other-system read information (including TS information) is read in step ST17 and output as the corresponding TS data. In this case, the TS configuration while receiving the lead information is recognized based on the TS information table 131,
The correction is performed by the S information correction circuit 132.

Next, in step ST18, it is determined whether or not the data after the write switching start address has been read. If the data after the write switching start address has not been read, the process returns to step ST17 to repeat the steps until the data after the write switching start address is read. If the process of ST17 is repeated and the data after the write switching start address is read, the process proceeds to step ST1
In step 9, a switch control end display is performed, and the process returns to step ST11 to store a fixed amount of cell data in the data storage RAM 120.

As described above, the read control unit 130 first starts a read operation by storing a certain amount of data in the data storage RAM 120. When the own system is the active system, the data at the next position after the previous read is read. When the data of the entire area of one cell is read, the read cell area information and the TS information at that position are output to another system. On the other hand, when the own system is the standby system, if the switching signal is not generated, the same operation as in the case where the own system is the active system is performed.

When the switching signal is generated, the read information (including the TS information) of the other system and the TS information table are used to
Read the same position (address) as the other system. Thereafter, when the write switching start address is read,
Since the contents of the transmission user data match in the local system and the other system,
Switching control ends, switching is performed by an external selector,
The switching operation ends. At this time, the operation system / standby system is also switched.

As described above, in the ATM duplexer according to the first embodiment, the cell disassembly unit that performs AΤM cell disassembly includes the write control unit 110, the data storage RAM_0 system 120, and the read control unit 130. System device 100
, Write control section 210, data storage RAM_1 system 2
20 and a first-system device 200 including a read control unit 230, and the write control units 110 and 210 are duplicated.
Has an information notification function for writing cell data to the same address position with the other system when switching between the active system and the standby system, and the read control units 130 and 230 perform other operations for reading the same address position. Since the system has an information notification function with the system and a determination unit that determines the end of the switching assuming that the transmission user data of the own system and the transmission user data of the other system match when reading the write switching start address by the switching, the switching signal Using the write information and read information (including TS information) from the other system as the trigger, the write data to the data storage RAM is aligned, and the read position is adjusted to match the transmission user data of the own system and the other system. By switching this using an external selector, instantaneous interruption switching can be performed without causing a data error (in other words, data error because of instantaneous interruption switching) It will not occur.).

Therefore, the standby system can be maintained by periodically switching between the active system and the standby system, and both systems can be regularly maintained (maintenance). Can be improved.

Second Embodiment The duplex configuration of an ATM duplex device according to a second embodiment of the present invention is the same as that of FIG. 1 of the first embodiment.

FIG. 9 is a diagram showing the basic configuration of an ATM duplexer according to the second embodiment. The upper part of the broken line in FIG. 9 shows [0 system] and the lower part of the broken line shows [1 system].

The difference from the first embodiment is that each of the channels is stored so that the data storage RAM can support a plurality of channels.
That is, an area is secured for each. Therefore,
Channel information is added to the write / read control. Here, in the area of each channel of the data storage RAM, a data area is allocated for each cell data as in the first embodiment.

In FIG. 9, reference numeral 300 denotes a 0-system device;
Is a system 1 device, and a system 0 device 300 is a light control unit 3
10, a data storage RAM_0 system 320 and a read control unit 330. The first system device 400 includes a write control unit 410, a data storage RAM_1 system 420, and a read control unit 430.

The 0-system apparatus 300 and the 1-system apparatus 400
Since they have the same configuration, a description will be given taking the 0-system apparatus 300 as an example.

The ATM cell has its payload data extracted by the receiving process, and is delivered to the data storage RAM_0 system 320 as the received cell data_0 system. From the reception process, the valid cell reception signal and the reception cell channel information are passed to the write control unit 310.

The write control section 310 has a write address_
0 system and write control signal_0 system are stored in RAM_0 for data storage.
Output to the system 320. Further, the write control unit of the own system (for example, the light control unit 310) receives the write information_1 system (including the ch information) output from the write control unit of another system (for example, the light control unit 410).

The read control unit 330 receives the TS information and the write information_0 system output by the user data transmission processing. Further, the read control unit of the own system (for example, the read control unit 330) receives the read information_1 system (including the ch information) output from the read control unit of the other system (for example, the read control unit 430).

[0086] The read control unit 330
0 system and read control signal_0 system are stored in RAM_0 for data storage.
Output to the system 320. As a result, the data storage R
The AM_0 system 320 transmits the transmission user data_0 system.

Here, the write control unit 4 of the first system 400
10, the data storage RAM_1 system 420 and the read control unit 430 have the same configuration.

FIG. 10 is a diagram showing the configuration of the data storage RAM. The data storage RAM_0 system 320 and the data storage RAM_1 system 420 have the same configuration.

As shown in FIG. 10, the data area configuration shown in FIG. 3 is one channel area, which is stacked for a plurality of channels.

FIG. 11 shows the write control units 310 and 410.
FIG. 3 is a diagram showing the configuration of FIG. Write control units 310, 410
Have the same configuration, and will be described using the light control unit 310 as an example.

In FIG. 11, the write control unit 310
It comprises a memory 311, a select condition determination circuit 312, a selector 313, an address conversion circuit 314, a write timing adjustment circuit 315, and a write control signal generation circuit 316.

The memory 311 stores the previously written cell area information for each channel.

The select condition judging circuit 312 has an operation system /
The selection condition is determined based on the state of the standby system and the presence or absence of the switching signal.

The selector 313 selects the cell area information stored in the memory 311 and the write information including the channel information from another system (here, the write information_1 system) based on the determination result of the select condition determination circuit 312. .

The address conversion circuit 314 converts the selected information into an address of a cell area to be written next,
Output as a write address (write address_0 system).

The write timing adjustment circuit 315
Performs write timing adjustment using the valid cell reception signal.

The write control signal generation circuit 316 generates a write control signal (write control signal_0 system) based on the valid cell reception signal whose timing has been adjusted.

FIG. 12 shows the read control units 330 and 430.
FIG. 3 is a diagram showing the configuration of FIG. Read control units 330 and 430
Have the same configuration, and will be described using the read control unit 330 as an example.

In FIG. 12, the read control unit 330
TS information and channel information table 331, TS information correction circuit 332, memory 333, select condition determination circuit 33
4, selector 335, address conversion circuit 336, switching end memory 337, switching end determination circuit 338, read timing adjustment circuit 339, and read control signal generation circuit 34
It consists of 0.

The TS information and ch information table 331 is
The TS information and the ch information of the user data are stored in a table.

The TS information correction circuit 332 converts the read information (including the TS information and the ch information) of the other system into the TS information and the ch information.
The information is corrected based on the information table 331 and the TS information during reception of information of another system is output to the memory 333.

The memory 333 stores the cell area information at the position where the reading of the data for one cell is completed based on the corrected information.
Stored every h.

The select condition judging circuit 334 has an operation system /
The selection condition is determined based on the state of the standby system and the presence or absence of the switching signal.

The selector 335 determines the cell area information stored in the memory 333 based on the determination result of the select condition determination circuit 334 and the information (here, the read information_1 system) obtained by correcting the TS configuration between the reception of the information of the other system. Select

The address conversion circuit 336 converts the selected information into an address of a cell area to be read next,
Output as a read address (read address_0 system). The switching end memory 337 stores each c including the channel setting status.
The switch end state of h is stored.

The switching end judgment circuit 338 knows the start of the switching operation based on the selection condition judgment from the selection condition judgment circuit 334, and outputs each c from the switching end memory 337.
The switch end is determined from the switch end state information of h, the write information and the read information including the ch information, and when all the channels have been switched, a switch end signal is output. Where all c
h is an arbitrary value (ch) selected by the user and can be sequentially changed.

The read timing adjustment circuit 339
Performs read timing adjustment according to a user data transmission request signal.

Read control signal generation circuit 340 generates a read control signal (read control signal_0 system) based on the user data transmission request signal whose timing has been adjusted.

Hereinafter, the operation of the above-described ATM duplexer will be described.

[Overall Operation] Taking the 0-system apparatus 300 as an example,
The overall operation will be described. The basic operation is the same as in the first embodiment.

The payload data is extracted by the reception processing, and the data storage RAM_
Delivered to system 0 320. Further, from the reception process, the valid cell reception signal and the reception cell channel information are passed to the write control unit 310.

Further, the write control section 310 outputs the write address_0 system and the write control signal_0 system to the data storage RAM_0 system 320. Further, the write control unit 310 of the own system receives the write information_1 system including the ch information output from the write control unit 410 of the other system.

The read control unit 330 receives the TS information, the ch information, and the write information_0 system output by the user data transmission processing, and receives the read control unit 33 of the own system.
0 receives the read information_1 system including the channel information output from the read control unit 430 of the other system.

Further, the read control section 330 outputs the read access_0 system and the read control signal_0 system to the data storage RAM_0 system 320. As a result, the data storage RAM_0 system 320 transmits the transmission user data_0 system including the channel information.

[Operation of Each Part] FIG.
It is a flowchart which shows the flow of operation of 10,410, and a basic operation | movement is the same as that of said FIG. Since the write control units 310 and 410 have the same operation, the flow of the operation of the write control unit 310 of the 0-system apparatus 300 is taken as an example.

First, it is determined in step ST21 whether a valid cell has been received. If a valid cell has been received, it is determined in step ST22 whether the own system is the active system and the other system is the standby system (own system = operating system). System, other system = standby system).

When the own system is the active system and the other system is the standby system, the received cell data is written in the area next to the previous write of the corresponding channel in step ST23 in order to continue the write operation in the current active system. Returning to step ST21, the next valid cell is received.

The own system is the standby system and the other system is the active system (own system =
When the standby system and the other system are the active systems, the own system is the standby system, so it is determined whether or not a switching signal has been generated in step ST24. If no switching signal has been generated, the process proceeds to step ST23.
To perform the same write operation as when the own system is the active system.

When the switching signal is generated in step ST24, the cell data is written in step ST25 according to the other system write information (including the channel information). At this time, the same cell data is written to the same position (address) in both the own system and the other system.

Next, at step ST26, the write start position and channel information are displayed by switching, and step ST21 is performed.
And the next valid cell is received. Specifically, it notifies the read control unit 330 of the write switching start address and the ch information, and receives the next valid cell.

As described above, first, the write control unit 310 receives a valid cell, and if the own system is the active system, writes the received cell data to the area next to the previously written cell of the corresponding channel. If the own system is the standby system, it is checked whether or not a switching signal has been generated. If the switching signal has not been generated, the same operation as when the own system is the active system is performed.

When the switching signal is generated, the received cell data is written at the same position as the other system by using the write information (including the channel information) of the other system. When the receiving cell is written at the same position (address) in both the own system and the other system, the position (address) and the ch information are notified to the read control unit 330.

FIG. 14 shows the read control units 330 and 430.
9 is a flowchart showing the flow of the operation of FIG. 7, and the basic operation is the same as that of FIG. Light control units 330, 43
0 is the same operation, and in order to correspond to the operation of the write control unit 310, the flow of the operation of the read control unit 330 of the 0-system apparatus 300 is taken as an example.

First, in step ST31, the data storage R
It is determined whether a certain amount of cell data has been stored in the AM 320. Here, the certain amount is a predetermined value that can be arbitrarily determined by the user.

When a certain amount of cell data has been stored in the data storage RAM 320, whether the own system is the active system and the other system is the standby system in step ST32 (own system = active system, other system =
It is determined whether it is a standby system or not.

When the own system is the active system and the other system is the standby system, in order to continue the read operation in the current active system, in step ST33, the data position next to the previously read data of the corresponding channel is read, and in step ST34, It is determined whether the data read of one cell area has been completed. If the data read of one cell area is not completed, the read of step ST33 is repeated until the data read of one cell area is completed.

When the data reading of one cell area is completed, the read cell area information and the TS and ch information at the position are output to another system in step ST35, and the process returns to step ST31 to store a fixed amount of cell data in the data storage RAM 320. To accumulate. Here, the TS indicates the number of the data position from the head (reference) signal of the user data as shown in FIG. Note that ch shown in FIG.
Is an example, and the channel configuration can be freely set by the user.

Returning to FIG. 14, when the own system is the standby system and the other system is the active system (own system = standby system, other system = active system) in step ST32, the own system is the standby system. In step ST36, it is determined whether or not the switching signal has been generated. If the switching signal has not been generated, the process proceeds to step ST33 to perform the same read operation as when the own system is the active system.

When the switching signal is generated in step ST36, the other system read information (including TS information and ch information) and the TS information table are used in step ST37 to determine the position corresponding to the same position (address) as the other system. The data is read and output as the corresponding TS data. Here, the TS configuration and the channel configuration during reception of the read information are recognized based on the TS information and the channel information table 331, and are corrected by the TS information correction circuit 332.

Next, in step ST38, it is determined whether or not the data after the write switching start address of the corresponding channel has been read. If the data after the write switching start address of the relevant channel has not been read, the process returns to step ST37 to write the corresponding channel. Step S until reading after the switching start address
The process of T37 is repeated.

When the data subsequent to the write switching start address of the corresponding channel is read, the contents of the transmission user data of the corresponding channel match, so that the switching end information of the corresponding channel is held in the switching end memory 337 in step ST39.

Next, in step ST30, it is determined whether or not the switching has been completed for all the set channels determined in advance by the above-described processing.
Repeat 30.

When the switching has been completed for all the preset setting channels by the above processing, it is determined that the switching control as the device has been completed, the switching control completion display is performed in step ST31, and the process returns to step ST31. R for accumulation
A certain amount of cell data is stored in the AM 320. At this time, the active / standby system is also switched.

As described above, when the own system is the active system, the read control unit 330 reads the data at the next position of the corresponding channel after the previous read. When the data of the entire area of one cell is read, the read cell area information and the TS information and the ch information at the position are output to another system. On the other hand, when the own system is the standby system, if the switching signal is not generated, the same operation as in the case where the own system is the active system is performed.

When a switching signal is generated, the same position (address) as that of the other system is read by using the read information (including TS information and ch information) of the other system and the TS information table. Thereafter, when the write switching start address of the corresponding channel is read, since the content of the transmission user data of the corresponding channel matches, the switching end of the channel is held. Also, a channel that has been negotiated in advance for use by the user
When the switching is completed by the same processing, the switching control as the device is completed, the switching is performed by the external selector, and the switching operation is completed. At this time, the active / standby system is also switched.

As described above, the ATM duplexer according to the second embodiment has the data storage RAMs 320 and 4.
Since a channel area capable of supporting a plurality of channels is secured in the channel 20 and the channel information is added to the write / read control, the data is transmitted by switching the external selector after the transmission user data matches, as in the first embodiment. Instantaneous interruption switching is possible without generating an error. Therefore, by periodically switching between the active system and the standby system, maintenance of the standby system becomes possible, and the life of the apparatus and the quality of the apparatus can be improved.

In particular, in the second embodiment, it is possible to cope with a plurality of channels, and even when the usage status of a channel changes, the switching process is changed by changing the user channel setting according to the usage status. The switching operation can be performed without performing, and the versatility can be improved.

Here, in the first embodiment, the single state (c
h), that is, when a valid reception cell is normally received,
The present invention can be applied to a switching part of a duplexer that switches from an active system to a standby system when it is sufficient to transmit the user data in the order of the cell data of the received cell.

In the second embodiment, a plurality of channels, that is, valid cells to be received are valid cells of ch1, ch2
When the user data is transmitted in accordance with the order of receiving the cell data of ch1 and the ΤS portion of ch2 in accordance with the order of receiving the cell data of ch2, the user data is transmitted from the operation system to the standby system. This can be applied to the switching part of the duplexing device that switches to.

Further, in the second embodiment, the present invention can be applied to a duplex portion of a device in which a channel use condition changes, such as connecting / disconnecting each channel.

In both the first and second embodiments, when the read position (address) reaches the write position (address) by switching, a cell pointer indicating the structured head is added to the cell data. In some cases, the switching is not completed until the cell and the next cell position (address) are read, so that the influence of the structured transfer can be eliminated, and the redundancy when the ATM cell performs the structured transfer. It is suitable to be applied to the switching part of the device.

It should be noted that the ATM duplexer according to each of the above embodiments is connected to an STM network such as an existing device (PBX or TDM) or the like.
The present invention can be applied to an ATM duplexer having an ATM disassembly function for connecting an ATM network and disassembling ATM cells. However, the present invention is not limited to this, and any device having an ATM cell disassembly function can be used. It is needless to say that the present invention is applicable.

Further, in each of the above embodiments, the cell has the AT
Although the M cell is used, the packet is not limited to the ATM cell and may be any packet. For example, the cell header portion and the payload portion may have a byte length and format different from those of the ATM cell.

Further, it goes without saying that the type, the number of connections, the connection form, and the like of the memory, the control unit, the circuit, the selector, and the like that constitute the above-described duplication device and various circuits are not limited to the above-described embodiment.

[0145]

According to the ATM duplexer of the present invention, 1
A data storage memory with an area reserved for each cell data, and write control for the memory
When the standby system is switched, a write control unit having an information notification function unit with another system for writing cell data at the same address position and a read control unit for performing read control on the memory and reading the same address position A read control unit having an information notification function unit for the system, and a determination unit for judging the end of the switching assuming that transmission user data of the own system and the transmission user data of the other system match when reading a write switching start address by switching. Therefore, maintenance (maintenance) can be performed periodically for both the active system and the standby system, and the life and quality of the apparatus can be improved.

[Brief description of the drawings]

FIG. 1 shows an ATM according to a first embodiment to which the present invention is applied.
FIG. 2 is a diagram illustrating an overall configuration of a duplexer.

FIG. 2 is a diagram showing a basic device configuration of an ATM duplex device of the ATM duplex device.

FIG. 3 is a diagram showing a configuration of a data storage RAM of the ATM duplex device.

FIG. 4 is a diagram showing a configuration of a write control unit of the ATM duplex device.

FIG. 5 is a diagram showing a configuration of a read control unit of the ATM duplex device.

FIG. 6 is a flowchart showing an operation flow of a write control unit of the ATM duplex device.

FIG. 7 is a flowchart showing a flow of an operation of a read control unit of the ATM duplex device.

FIG. 8 is a diagram for explaining TS information of the ATM duplex device.

FIG. 9 is an ATM according to a second embodiment to which the present invention is applied;
FIG. 2 is a diagram illustrating a basic device configuration of a duplex device.

FIG. 10 is a data storage RAM of the ATM duplex device.
FIG. 3 is a diagram showing the configuration of FIG.

FIG. 11 is a diagram showing a configuration of a write control unit of the ATM duplex device.

FIG. 12 is a diagram showing a configuration of a read control unit of the ATM duplex device.

FIG. 13 is a flowchart showing a flow of an operation of a write control unit of the ATM duplex device.

FIG. 14 is a flowchart showing a flow of an operation of a read control unit of the ATM duplex device.

FIG. 15 is a diagram for explaining TS information of the ATM duplex device.

FIG. 16 is a diagram for explaining conventional ATM cell decomposition.

[Explanation of symbols]

10 ATM device, 20, 100, 3000 system device,
30, 200, 4001 system device, 40 selector, 11
0, 210, 310, 410 light control unit, 120,
220, 320, 420 RAM_0 system for data storage,
130, 230, 330, 430 Read control unit

Claims (4)

[Claims] 1. An ATM duplexer in which a cell disassembly unit for performing A 分解 M cell disassembly is configured to be duplicated, and the cell disassembly unit is switched between an active system and a standby system to be usable, and an area is secured for each cell data. And write control for the data storage memory and
When switching the standby system, a write control unit having an information notification function unit with another system for writing cell data at the same address position, and a read control unit for performing read control on the memory and reading the same address position A read control unit having an information notification function unit with another system; and
A determination unit for determining that the transmission user data of the own system and the transmission user data of the other system match with each other to determine the end of switching
Μ Duplexing device. 2. An ATM duplex apparatus in which a cell decomposition unit for performing A @ M cell decomposition is configured to be duplicated, and the cell decomposition unit is switched between an active system and a standby system to be usable, and an area is secured for each cell data. A plurality of data areas obtained as one channel area, a data storage memory having a plurality of the channel areas, write control for the memory,
When the standby system is switched, a write control unit having an information notification function unit with another system for writing cell data at the same address position even when a valid cell of any channel is received, and a read control for the memory. And a read control unit having an information notification function unit with another system for reading the same address position, and a channel switch for judging the end of switching in units of channels when reading a write switching start address by switching the corresponding channel. An ATΜ duplex device comprising: an end determination unit; and a switch end determination unit that determines that all preset channels have been switched. 3. The information notification function means of the write control unit writes write cell data at the same address position as the other system by enabling write information of the other system, and writes the received cell data to the other system. 3. The ATΜ duplex device according to claim 1, wherein an address position after the write is notified as write information. 4. The information notification function means of the read control unit reads the same address position as that of the other system by making the read information of the other system available, reads the data, and changes the address position after reading to the other system. 3. The AT @ duplex device according to claim 1, wherein the AT @ duplex device is notified as read information.