JP2959626B2 - Mode setting method of ATM exchange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mode setting method for an ATM (asynchronous transfer mode) switch having a plurality of input / output ports and performing cell switching, and more particularly to simplification of a hardware configuration relating to mode setting, and The present invention relates to a mode setting method for an ATM exchange, which can simplify a mode setting procedure.

[0002]

2. Description of the Related Art First, the necessity of setting a mode in an ATM exchange will be described with reference to the drawings.

As shown in FIG. 7, a conventional ATM exchange includes a CPU (Central Processing Unit) 91 and a SAR
(Segmentation and Reassemble) section 92, switch 9
3 and a plurality of input / output ports 94. Each input / output port 94 includes a cell transfer circuit 95, an I / O interface 96, a mode setting circuit 97, and a plurality of registers 98, and has a predetermined format. The data information is transferred by the cell formed in.

Here, the flow of cells in the ATM exchange will be described.

The cell input to the input / output port 94 is subjected to necessary processing by a hardware receiving circuit including a register 98 in a cell transfer circuit 95, and then the switch 9
Sent to 3. Switch 93 routes the received cell to a destination port included in the cell format.
The cell to be routed is sent to the input / output port 94 of the destination, but is sent to the SAR unit 92 when the destination is the exchange itself.

[0006] The cell whose destination is the exchange itself is the transmitted SA.
After receiving predetermined processing in the R unit 92, it is sent to the CPU 91. On the other hand, a cell transmitted from the exchange is created in a predetermined format in the SAR unit 92 by setting data to be transmitted from the CPU 91 to the SAR unit 92, and transmitted through the switch 93.

At the time of such a cell transfer, various mode settings for initializing the mode in advance are required in the hardware of the ATM exchange prior to the start of operation.

Conventionally, in this type of mode setting method for an ATM exchange, as shown in FIG. 7, a CPU 91 of the ATM exchange initializes various registers 98 provided in a plurality of input / output ports 94, respectively. If you do
A setting instruction including data relating to the setting mode is sent to each of the input / output ports 94 via the data bus in a predetermined format.

The mode setting will be described more specifically.

First, in the ATM exchange, data is transmitted and received in units of predetermined cells, and cells to be input are input to the switch 93 via the cell transfer circuit 95 of the input / output port 94.
And is routed by the switch 93 based on the destination included in the cell header and sent to the input / output port 94 designated as the destination. However, if the destination is inside the ATM exchange, the data is sent to the CPU 91 via the SAR unit 92. Passed.

The cell transfer circuit 95 of the input / output port 94 needs to temporarily hold received cells in order to perform a function, and is provided with various registers 98 set in a mode by initial setting for each function. .

The mode setting of the register 98 as hardware is performed by a mode setting circuit based on a setting instruction included in a predetermined format individually received by the I / O interface 96 from the CPU 91 via the data bus via the data bus. 97.

[0013]

SUMMARY OF THE INVENTION The conventional ATM described above.
The mode setting method of the exchange has the following problems.

The first problem is that the hardware for setting the mode is complicated.

The reason is that each input / output port needs an interface for accessing the data bus and analyzing the received format in order to receive a predetermined format from the CPU via the data bus.
This is because the hardware configuration is complicated by the I / O interface between them.

A second problem is that it takes time to set the mode.

The reason is that, at the time of mode setting, the access of the CPU selects the I / O interface of each input / output port and performs the procedure for mode setting by the I / O interface.

An object of the present invention is to solve the above problems,
An object of the present invention is to provide a mode setting method for an ATM exchange, which can simplify a hardware configuration related to mode setting and a mode setting procedure.

[0019]

A mode setting method for an ATM switch according to the present invention is a method for setting a mode of hardware of the input / output port in an ATM switch having a plurality of input / output ports and performing cell switching. A control device for transmitting a setting instruction of a mode for instructing setting, forming a setting mode in a setting mode cell, and transmitting the setting mode cell to an input / output port, which is a destination of the setting instruction, via a switch; The output port includes a cell selector for selecting and taking in a setting mode cell input from the control device via a switch when receiving a mode setting instruction from the control device, and a setting mode cell taken in by the cell selector. Interpreting means for interpreting the condition of the mode setting from the CPU, and setting the mode to the hardware to be set based on the interpreted condition of the mode setting. And a setting unit that performs constant.

As described above, the mode setting instruction to each input / output port received from the control device including the CPU is A
Since it is used only for selection of the setting mode cell received from the switch of the TM exchange, when each input / output port receives the mode setting, a simple instruction circuit or tag information of the cell can be used as described later. Hardware such as an I / O interface that interfaces with the CPU via the data bus can be eliminated. The setting mode cell is obtained by adding setting mode information to the payload of a cell transmitted from the inside of the ATM exchange. Since the data to be set uses a cell which has been created in the past, a new special procedure is required. Is unnecessary, the procedure for this is simple, and the hardware can be simplified.

[0021]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a functional block diagram showing an embodiment of the present invention. In the mode setting method of the ATM exchange shown in FIG. 1, the ATM exchange includes a control device 1, a switch 2, and a plurality of input / output ports 3, and the control device 1 provides a setting mode preparation / instruction unit 4 and a cell formation. Sending unit 5,
It is also assumed that each input / output port 3 has a cell selector 6, a setting mode interpretation / setting unit 7, and mode setting target hardware 8.

One of the differences from the prior art is that the input / output port 3
Does not include the setting mode in the mode setting instruction received by the I / O port 3, and sends the setting instruction received by the input / output port 3 to the CP of the ATM exchange.
The other is that U does not receive directly from the data bus to which it connects, and the other is that the I / O port 3 receives data related to the setting mode via the switch 2 in the form of cells.

The preparation / instruction unit 4 for the setting mode is, for example, C
A part of the function of the PU, which prepares the setting mode according to the external input specification or the mode setting program driven under the predetermined condition, and specifies and specifies the hardware of the input / output port for the mode setting A mode setting instruction is sent to the specified input / output port, and on the other hand, the cell forming / sending unit 5 is instructed to create and send a setting mode cell in which the contents of the setting mode are carried in the payload with the specified input / output port as a destination.

The cell forming / transmitting unit 5 is provided with the SA of the ATM switch.
It is an R unit, which creates a setting mode cell according to an instruction from the preparation / instruction unit 4 and sends it to the switch 2 to a designated input / output port.

The cell selector 6 of the input / output port 3 sends a cell received from the switch to the setting mode interpreting / setting unit 7 when receiving the setting instruction of the setting mode from the control device 1.

The setting mode interpretation / setting unit 7 interprets the mode setting data from the format payload using the cell received from the cell selector 6 as the setting mode cell, and sets the setting mode to the hardware 8 to be set. Shall be performed.

Finally, the mode setting target hardware 8
Are various registers for temporarily holding input / output cells, for example, and are set by the setting mode interpretation / setting unit 7 to set initial settings for giving various function modes.

As described above, the setting mode preparation / instruction unit 4 which is a function of the CPU issues a simple ON / OFF setting instruction for switching the cell selector 6 to the input / output port 3 targeted for mode setting. Since it is only necessary to send an OFF signal, the instruction information to each input / output port 3 is simple, and the input / output port 3 also uses the cell selector 6 according to the received setting instruction.
Only the operation of changing the cell transmission destination may be performed. For this reason,
A simple setting instruction unit as described in the following embodiment can be configured without using a data bus used for data transfer.

The mode contents to be set can be included in the payload of the cell generated inside the ATM exchange, and the destination of the cell can be specified to the input / output port 3 for mode setting. From the setting mode preparation / instruction unit 4 to the input / output port 3 of the mode setting target
Can be delivered to

In the above description, the path of the setting instruction issued from the preparation / instruction section of the setting mode is vague. However, as described in a specific example by the following two embodiments, the input / output port is switched by the setting instruction. Any means may be used as long as the setting mode cell received from the device can be taken into the internal setting mode interpretation / setting unit instead of being sent to the outside.

The following embodiments will be described with reference to the drawings. However, the arrangement of functions or the change of the operation procedure is free as long as the above functions are satisfied, and the description of the embodiments does not limit the present invention. .

[0033]

【Example】

[First Embodiment] Next, a first embodiment will be described with reference to FIGS. 2, 3 and 4. FIG.

FIG. 2 is a functional block diagram showing the first embodiment. In the mode setting method of the ATM exchange shown in FIG. 2, the CPU 11 is connected to the SAR unit 12 and the mode setting instruction unit 13 via a data bus, and each of the plurality of input / output ports 14 is connected to a cell transfer circuit. 15,
It has a cell selector 16, a mode setting circuit 17, and various registers 18. The SAR unit 12 and each input / output port 14 connect a cell to be transmitted / received to the switch 2, and the switch 2 performs a routing process on the cell.

Each of the components has the following
It has the same function as a conventional component having the same name.
Next, points different from the related art will be described.

The main difference is that a mode setting instruction unit 13 is provided which receives a setting instruction by an on / off signal addressed to each input / output port 14 sent from the CPU 11 via the data bus, and the setting instruction is provided by the mode setting instruction unit. 13 to the mode setting target input / output port 14,
The setting mode content is created in the setting mode cell by the SAR unit 12 receiving an instruction from the CPU 11, and transmitted to the switch 2 with the target input / output port 14 as a destination.

Therefore, the CPU 11 is provided with each input / output port 1
4 is instructed to set the mode by input / output port 1
4 is only sent to the mode setting instructing unit 13 and the setting data may be sent to the SAR unit 12 as sending data to instruct the creation of the setting mode cell.

When the SAR unit 12 receives an instruction to create a set mode cell based on the mode setting data received from the CPU 11, the SAR unit 12 has a 5-byte header portion, which is the basic format of the ATM cell, as shown in FIG. , The destination information of the destination input / output port 14 is inserted, and the setting register IDs for the n setting registers for the mode setting in the destination input / output port 14 are added to the subsequent 48-byte payload.
(Indicator) and setting mode cells into which setting data 1 to n for mode setting for each of the n setting registers are inserted and sent to the switch 2.

The mode setting instructing unit 13 sends an ON signal to the cell selector 16 of the input / output port 14 and the mode setting circuit 17 based on the setting instruction received from the CPU 11, and sets the cell input from the switch 2 by the cell selector 16 to the mode setting. Circuit 17 and the mode setting circuit 1
7 is driven.

The cell selector 16 receives the off signal from the normal mode setting instructing unit 13 and connects a cell exchanged with the switch 2 to the outside. When receiving the ON signal from the mode setting instruction unit 13, the cell selector 16 sends the cell received from the switch 2 to the mode setting circuit 17.

As shown in FIG. 4, bit areas 1 to n corresponding to n registers 18 to be set are assigned to the setting register ID area of the setting mode cell. It is assumed that the register of “1” is a register to be set. The data in the setting data area corresponding to this bit “1” is set in each setting target register.

Next, a setting procedure at the time of mode setting will be described with reference to FIG. 2 and FIG.

First, the CPU 11 uses the input / output port 14 for which the mode is to be set as routing data, and registers the input / output port 14 of the hardware to be set in the input / output port 14.
And setting contents are prepared as setting data (step 101).

The ready CPU 11 sends a mode setting instruction specifying the target input / output port 14 to the mode setting instruction unit 13 via the data bus (step 102).

Upon receiving the mode setting instruction, the mode setting instruction section 13 sends an ON signal to the corresponding input / output port 14 to instruct the mode setting. The input / output port 14 receiving the mode setting instruction by the ON signal is the cell selector 16
And the cell received from the switch 2 is sent to the mode setting circuit 17 and the mode setting circuit 17 is driven to set the mode setting state (step 103).

On the other hand, after instructing the mode setting in step 102, the CPU 11 sends the setting data prepared in step 101 and the input / output port 14 to be set to the SAR unit 12,
An instruction is issued to create a setting mode cell having the port as a destination (step 104).

The SAR unit 12 creates a setting mode cell having the format shown in FIG. 4 according to the received instruction and sends it to the switch 2 (step 105).

The switch 2 sends the received set mode cell to the mode setting target input / output port 14 according to the destination inserted in the header portion.

Since the input / output port 14 has been set to the mode setting state in the above procedure 103, the set mode cell accepted by the cell selector 16 is sent to the mode setting circuit 17, and the mode setting circuit 17 The contents of the register 18 as hardware and the setting mode are interpreted (step 106), and the data received for the target hardware is set as the mode setting in the target register 18 (step 107).

When the mode setting is completed in step 107, the mode is set from the setting mode to the normal mode in response to the OFF signal from the mode setting instruction section 13 (step 10).
8) End the procedure.

When the data in the payload area shown in FIG. 4 has the same mode setting, by using the multicast function of the ATM exchange, a plurality of input / output ports 14 can be simultaneously set and transmitted once. The mode can be set for.

[Second Embodiment] Next, a second embodiment will be described with reference to FIGS.

Normally, when a cell is routed in an ATM exchange, information of a header portion of the cell, VPI (Ve
rtual Path Indicator) or VCI (Vertual Channe
l) is rarely seen directly, and tag information unique to the ATM exchange is often added.

Therefore, the tag information is added at the input / output port 24 when input to the ATM exchange, and is deleted at the input / output port 24 when output from the switch 23. Also,
Inside the ATM exchange, the CPU 21 adds / deletes tag information.
Controls deletion.

FIG. 5 shows an example of a cell format to which tag information is added.

In this tag information, as shown in the figure, an HS area for displaying whether or not the cell is a setting mode cell, and a switch 2
3 and a routing information area formed in a format in which hardware-based routing processing is easy.

The HS area is located at the beginning of the cell, and the HS bit “0” indicates a normal cell, and the cell is routed according to the routing information contained in the cell, while the HS bit “1” is the setting mode for the setting mode. It represents a cell, and the routing information included in the cell is the input / output port 24 to be set.

Therefore, in the second embodiment, as shown in FIG. 6, C is transmitted through the mode setting instruction section shown in FIG.
The path of the setting instruction sent from the PU to the input / output port is replaced with this tag information and becomes unnecessary.

A setting mode discriminating circuit 2 having the same function as the cell selector of the input / output port corresponding to the tag information.
6 is provided in place of the cell selector, and switch 2
All cells input from 3 to the input / output port 24 are checked in the HS mode by the setting mode determination circuit 26,
When the HS bit is “0”, the tag information is deleted as a normal cell and transmitted to the outside.

On the other hand, the HS area is checked, and if the HS bit is "1", the tag information is deleted and sent to the internal mode setting circuit 27 because it is a setting mode cell for hardware setting.

The other functions are almost the same as those of the first embodiment.

Next, a series of mode setting processing operations will be described with reference to FIG.

First, the CPU 21 transmits the prepared routing data and setting data to the SA together with a mode setting instruction.
Send to R section 22. The SAR unit 22 creates a setting mode cell having the format shown in FIG.

The switch 23 sends out the received cell according to the routing information in the tag information area. The destination of the routing information of the setting mode cell is the input / output port 24 of the mode setting target, and the setting mode determination circuit 26 of the mode setting target input / output port 24 receives the setting mode cell.

As described above, the setting mode discriminating circuit 26 checks the HS area of the received cell and identifies the HS bit “1”, so that it is interpreted as a setting mode cell for hardware setting and the tag information is read. And sends it to the internal mode setting circuit 27.

The mode setting circuit 27 sets the mode of the register 18 of the target hardware based on the setting register information and the setting data included in the cell.

[0067]

As described above, according to the present invention, the following effects can be obtained.

The first effect is that the hardware configuration relating to the mode setting can be simplified.

The reason is that a setting mode cell is provided in a cell to be transferred inside the ATM exchange, setting mode information is added to the payload of the setting mode cell, and a mode setting instruction to each input / output port is issued by a switch of the ATM exchange. Since the setting mode is used only for selecting the cell, when each input / output port receives the mode setting, it is possible to use a simple instruction circuit or the tag information of the cell,
I / O interface with CPU via data bus
This is because hardware such as an interface can be eliminated.

The second effect is that the procedure relating to the mode setting can be simplified.

The reason is that, similarly to the above, the setting mode cell is provided in the cell to be transferred inside the ATM exchange, and the data to be set by setting the setting mode information in the payload of the setting mode cell has been conventionally created. , Which eliminates the need for new special steps,
This is because the mode setting instruction to each input / output port is used only for selecting the setting mode cell received from the switch of the ATM exchange, thereby simplifying the mode setting instruction procedure. Also, because the setting data is formed in the cell, the multicast setting can be performed for a plurality of input / output ports.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention.

FIG. 2 is a functional block diagram showing a first embodiment of the present invention.

FIG. 3 is a flowchart showing one embodiment of a main operation procedure in FIG. 2;

FIG. 4 is a format diagram showing one embodiment of a setting mode cell used in FIG. 2;

FIG. 5 is a format diagram showing one embodiment of a setting mode cell used in FIG. 6;

FIG. 6 is a functional block diagram showing a second embodiment of the present invention.

FIG. 7 is a functional block diagram showing an example of the related art.

[Explanation of symbols]

 Reference Signs List 1 control device 2, 23 switch 3, 14, 24 input / output port 4 preparation / instruction unit 5 cell formation transmission unit 6, 16 cell selector 7 interpretation / setting unit 8 hardware 11, 21 CPU 12, 22 SAR unit 13 mode setting Instructing unit 15 Cell transfer circuit 17, 27 Mode setting circuit 18 Register 26 Setting mode discriminating circuit

Claims (3)

(57) [Claims] In an ATM (Asynchronous Transfer Mode) exchange mode setting system having a plurality of input / output ports and performing cell exchange, an ATM exchange sets a mode when setting a mode of hardware of the input / output port. A control device for transmitting a setting instruction of a designated mode, forming a setting mode in a setting mode cell, and transmitting the setting mode cell to an input / output port, which is a destination of the setting instruction, via a switch; A cell selector for selecting and taking in a setting mode cell input from the control device via a switch when receiving a mode setting instruction from the control device; and setting a mode from the setting mode cell taken in by the cell selector. Interpretation means for interpreting the setting conditions and mode setting to the hardware to be set based on the interpreted mode setting conditions. And a setting means for performing setting. 2. The control device according to claim 1, wherein the control device includes a mode setting instruction unit that receives the mode setting instruction from the control device in a predetermined format, and notifies the input / output port of the instruction to each input / output port by a mode setting switching signal. In preparation,
At the input / output port, a cell received from a switch when receiving an instruction from the mode setting instruction unit is regarded as the setting mode cell, and the mode is set by interpreting a mode setting condition from configuration information of the setting mode cell. A mode setting method for an ATM exchange, characterized in that: 3. The input / output port according to claim 1, wherein the cell created by the control device adds a code for identifying the setting mode cell and routing information in the switch as tag information to a head portion. Then, tag information for identifying a normal cell is added to a cell input to the own ATM exchange, the tag information is deleted from a cell transmitted from the own ATM exchange, and when a set mode cell is identified by the tag information. A mode setting method for an ATM exchange, in which a mode setting condition is interpreted from cell configuration information to set a mode.