JPH07143138A - Atm switch test system - Google Patents

Abstract

PURPOSE:To vest the ATM switch of a standby system in advance with respect to the ATM switch test system in an ATM exchange. CONSTITUTION:The system is provided with a test cell input means 100 generating a test cell including prescribed test data and inserting the cell to a cell stream received by ATM switches 10,11, an identification information addition means 200 adding identification information representing a valid cell to all cells received by an active ATM switch 10 and a test cell received by an ATM switch 11 of a standby system and adding identification information representing an invalid cell to other cells than the test cell received by the ATM switch of the standby system, a valid cell selection means 300 selecting only the valid cell from each cell outputted from the ATM switches of both the systems, and a test cell check means 400 extracting the test cell from the selected valid cell stream to check the normality of test data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM switch test system in an ATM switch, and more particularly to an ATM switch test system in an ATM switch having a duplicated ATM switch in which one is used as an active system and the other is used as a standby system.

[0002]

2. Description of the Related Art FIG. 5 is a diagram showing an example of a conventional ATM exchange. Note that, in FIG. 5, only the communication path system that is the subject of the present invention is shown, and the connection control system and the like are omitted.

The speech path system of the ATM exchange shown in FIG. 5 is a dual ATM switch (ATS) (1) provided in common to each subscriber terminal (TE) (3) accommodated therein.
And a subscriber interface (LCT) (2) provided individually corresponding to each of the subscriber terminals (TE) (3).

Dual ATM switch (ATS)
(1) [Individual ATM switches (ATS) are referred to as 0-system (1 ₀ ) and 1-system (1 ₁ )], one [for example, 0-system (1 ₀ )] is the current system, and the other [for example, 1-system (1 11 ₁ )] is operated as a standby system.

For example, a subscriber response unit (LCT) (2₁) To
Subscriber terminal (TE) (3) ₁) And subscriber support
Division (LCT) (2₂) Accommodated in the subscriber terminal (TE)
(3 ₂) And via the ATM switch (ATS) (1)
, The subscriber terminal (TE) (3)₁) From
The information to be stored is a payroll including the information divided into predetermined lengths.
Section and subscriber terminal (TE) (3₁) Used by
Path (VP) and virtual channel (VC)
Identifier (VPI) and Virtual Channel Identifier (VCI)
Form called a cell (C) having a header part (HD) including
The corresponding subscriber response unit (LCT) (2₁) To
To be done.

In the subscriber correspondence unit (LCT) (2 ₁ ), the virtual channel conversion unit (VCC) (21) of each cell (C) transferred from the subscriber terminal (TE) (3 ₁ )
The virtual path identifier (VPI) and the virtual channel identifier (VCI) added to the header part are used as the virtual path (VP) and the virtual channel (VC) used by the subscriber terminal (TE) (3 ₂ ) on the receiving side. Virtual path identifier (VP
Tag portion was converted to I) and the virtual channel identifier (VCI), further specifies the transfer path in the ATM switch (ATS) (1) (adds TAG), both systems ATM switch (ATS) (1 ₀₎ And enter in (1 ₁ ).

Each ATM switch (ATS) (1 ₀ ) and (1 ₁ ) analyzes the tag portion (TAG) added to each input cell (C), and then inputs each input cell ( C) is transferred respectively, and the called subscriber terminal (TE)
It is transmitted to the subscriber response unit (LCT) (2 ₂ ) accommodating (3 ₂ ).

In the subscriber response unit (LCT) (2 ₂ ), the selection unit (SEL) (24) transmits the cells (ATS) (1 ₀ ) and (1 ₁ ) of the ATM switches (A ₀ ) and (1 ₁ ) of both systems. 0) ATM operated as the active system in C)
Cell (C) transmitted from switch (ATS) (1 ₀ )
Is selected and transferred to the called subscriber terminal (TE) (3 ₂ ).

[0009] The calling party's subscriber response unit (LCT)
Virtual channel converter (VCC) in (2 ₁ ) (21)
Is a virtual path identifier (VPI) and a virtual channel identifier (VCI) of the calling side and the called side, and a tag section (TA
G) is notified from the connection control system (not shown) at the call setting stage, and the selection unit (SEL) (24) in the subscriber-facing unit (LCT) (2 ₂ ) on the receiving side is a 0-system ATM switch. (ATS) (1 ₀ ) and 1-system ATM switch (AT
S) (1 ₁ ) is informed in advance from a connection control system (not shown) which is used as the active system.

In order to confirm the normality of the speech path system of the ATM switch, the subscriber cell unit (LCT) (2 ₁ ) and (2 ₂ ) are provided with a test cell transmission unit (TCG) (22), Insertion part (INS) (23), test cell inspection part (TCC)
(25) and a branch part (DRP) (26) are provided.

The test cell transmission unit (TCG) (22) is
A specific virtual path identifier (VPI) that includes predetermined test data in the payload section and indicates that it is for test
And a test cell (C _T ) to which a header part including a virtual channel identifier (VCI) is added is created at regular intervals and transmitted to the insertion part (INS) (23).

The inserting unit (INS) (23) transfers the test cell (C _T ) periodically transmitted from the test cell sending unit (TCG) (22) to the subscriber terminal (TE) (3 ₁ ). It is inserted in the interval of the cell (C) flow transmitted from, and transmitted to the virtual channel converter (VCC) (21).

Thereafter, the subscriber terminal (TE) (3₁) Sent from
The cell (C) to be tested to the test cell (C _T) To distinguish
Communication cell (C_C), And the cell (C) is a communication cell
(C_C) And a test cell (C_T).

Virtual channel converter (VCC) (21)
When receiving the test cell (C _T ) inserted in the cell (C) flow, the ATM switch adds a specific virtual path identifier (VPI) and a virtual channel identifier (VCI) indicating that it is for testing, and the ATM switch A tag part for designating a transfer path to be tested in (ATS) (1 ₀ ) and (1 ₁ ) is added and input to both ATM switches (ATS) (1 ₀ ) and (1 ₁ ).

Each 0-system ATM switch (ATS) (1 ₀ )
Also, the 1-system ATM switch (ATS) (1 ₁ ) is attached to the input test cell (C _T ) as in the case of other communication cells (C). Then, the input test cell (C _T ) is transferred and transmitted to the called party's subscriber response unit (LCT) (2 ₂ ).

In the subscriber response unit (LCT) (2 ₂ ), the selection unit (SEL) (24) is for testing transmitted from the ATM switches (ATS) (1 ₀ ) and (1 ₁ ) of both systems. among the cell (C _T) cells containing (C) stream, select the ATM switch that is operated (ATS) (1 ₀₎ test cells transferred from (C _T) as the working system, the branch portion (D
RP) (26).

The branch unit (DRP) (26) is connected to the selection unit (S
EL) (24), which is output from the subscriber terminal (T
E) header part (H) of each cell (C) transferred to (3 ₂ )
By analyzing the virtual path identifier (VPI) and the virtual channel identifier (VCI) included in D), only the test cell (C _T ) is branched, and the test cell inspection unit (TC) is branched.
C) Transmit to (25).

The test cell inspection unit (TCC) (25) is
The data included in the payload part (PL) of the test cell (C _T ) transmitted from the branch part (DRP) (26) is collated with the above-mentioned predetermined test data,
Check the normality of the communication path system based on the verification results.

As described above, it is operated as the active system.
0-system ATM switch (ATS) (1 ₀) Is normal
To be done. In the test process, the test cell inspection unit
(TCC) (25) is the test cell (C_T) Detected an anomaly
Then, the connection control system (not shown) is operated as the active system.
0 system ATM switch (ATS) (1₀) Reserve
1-system ATM switch that was operated as a standby system in the system
(ATS) (1₁) To the active system and resume operation
It

After that, the selection unit (SEL) (24) is a 1-system ATM switch (AT) which is newly operated as an active system.
S) (1 ₁ ) outputs only the cell (C) flow, so that the test cell inspection unit (TCC) (25) also selects A
The normality is confirmed by the test cell (C _T ) transferred via the TM switch (ATS) (1 ₁ ).

[0021]

As is clear from the above description, in the conventional ATM switch, the A
The normality of the speech path system is confirmed only by the test cell (C _T ) transferred via the TM switch (ATS) (1 ₀ ), and the standby ATM switch (ATS) (1 ₁ )
Since the normality of which is unconfirmed, the standby system ATM switch (ATS) ₍₁ 1) failure to the is detected by the potential is not, failure as soon as started operating as the active system actualized Then, the ATM switches (ATS) (1 ₀ ) and (1 ₁ ) of both systems become unusable, and there is a problem that the ATM switch concerned stops operating.

It is an object of the present invention to allow a preliminary ATM switch to be tested in advance.

[0023]

FIG. 1 is a diagram showing the principle of the present invention. In Figure 1, 1 ₀ and 1 ₁ were duplicated to operate one of the active system, the other as the standby system AT
The M switch.

Reference numeral 100 is a test cell input means provided by the present invention. Reference numeral 200 is an identification information adding means provided by the present invention. 300 is an effective cell selection means provided by the present invention.

Reference numeral 400 is a test cell inspection means provided by the present invention.

[0026]

The test cell input means (100) creates a test cell containing predetermined test data, and the AT of both systems is AT.
It is inserted in the cell flow input to the M switch (1 ₀ , 1 ₁ ).

The identification information adding means (200) includes all cells input to the ATM switch (1 ₀ ) operating as the active system and the ATM switch (1) operating as the standby system.
Identification information indicating that the cell is a valid cell is added to the test cell input in ₁ ), and the ATM is operating as a standby system.
Identification information indicating an invalid cell is added to cells other than the test cell input to the switch (1 ₁ ).

The effective cell selection means (300) is A for both systems.
The identification information added to each cell output from the TM switch (1 ₀ , 1 ₁ ) is analyzed, and only valid cells are selected and output.

The test cell inspecting means (400) extracts a test cell from the valid cell stream output from the valid cell selecting means (300) and inspects the normality of the test data contained in the test cell.

The identification information adding means (200) may input the identification information to each ATM switch (ATS) (1 ₀ , 1 ₁ ) in the same time domain in parallel with the cell to which the identification information is added. Be considered.

Further, it is considered that the identification information adding means (200) adds the identification information to a predetermined portion (for example, the header portion or the route information portion) of the addition target cell of the identification information.

Further, the effective cell selection means (300) is used for both systems.
ATM switch (1₀1₁) From the
When output, the effective cell is switched to the ATM switch of both systems.
(1 ₀1₁) Is considered to output to one cell alternately
To be done.

Therefore, an ATM switch operating as a standby system can be tested in advance with a test cell, and can be used as an active system in a state where its normality is confirmed.
The reliability of the ATM switch is greatly improved.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 2 is a diagram showing an ATM exchange according to an embodiment of the present invention, FIG. 3 is a diagram showing identification information according to an embodiment of the present invention, and FIG. 4 is a diagram showing identification information according to another embodiment of the present invention. FIG. The same reference numerals denote the same objects throughout the drawings. Also in FIG. 2, only the speech path system which is the subject of the present invention is shown, and the connection control system and the like are omitted.

In FIG. 2, the test cell sending section (TCG) is used as the test cell input means (100) in FIG.
(22) and insertion section (INS) (23) are provided in the subscriber corresponding section (LCT) (2 ₁ ), and the effective information addition section (A) is provided as the identification information addition means (200) in FIG.
AD) (27 ₀ ) and (27 ₁ ) are subscriber response units (L
CT) (2 ₁ ) and as a valid cell selecting means (300) in FIG. 1, a buffer memory (BUF)
(28 ₀ ) and (28 ₁ ), the identification information determination unit (AC
K) (29 ₀ ) and (29 ₁ ), and the buffer control unit (BFC) (2A) are subscriber response units (LCT).
(2 ₂ ), further provided as a test cell inspection means (400) in FIG. 1 as a test cell inspection unit (TCC).
(25) and a branch part (DRP) (26) are provided in the subscriber corresponding part (LCT) (2 ₂ ).

In FIG. 2 to FIG. 4, the subscriber correspondence unit (L
CT) (subscriber terminal accommodated in 2 ₁₎ (TE)
A connection is established between (3 ₁ ) and the subscriber terminal (TE) (3 ₂ ) accommodated in the subscriber interface (LCT) (2 ₂ ) and the subscriber terminal (TE) (3 ₁ ) communication cell (C _C) the subscriber corresponding unit output from (LCT) when transferred to the (2 _1), the subscriber corresponding portion (LCT) in (2 _1), virtual channel converter unit (VCC) (21) is the same as in FIG. 5, the virtual path identifier (VPI) and the virtual path identifier (VPI) in the header part (HD) of each communication cell ( _CC ) transmitted via the insertion part (INS) (23). The virtual channel identifier (VCI) is converted, the tag part (TAG) is further added,
Effective information addition part (AAD) (27 ₀ ) and (27 ₁ )
Communicate to.

In the subscriber response unit (LCT) (2 ₁ ), the test cell transmission unit (TCG) (22) is shown in FIG.
Similarly to the above, a test cell (C _T ) is created and transmitted to the insertion unit (INS) (23) at regular intervals, and the insertion unit (INS) (23) causes the test cell transmission unit (TCG).
Test cell (C _T ) transmitted periodically from (22)
Is inserted between the communication cells (C _C ) transmitted from the subscriber terminal (TE) (3 ₁ ), and the virtual channel conversion unit (V
CC) (21), and further to the virtual channel converter (V
CC) (21) is added to a specific virtual path identifier (VPI) and virtual channel identifier indicating the test to the test cell _{(C T) (VCI),} ATM switch (ATS) (1 ₀₎ And a tag section (TAG) for designating the transfer path to be tested in (1 ₁ ) is added and transmitted to the effective information addition sections (AAD) (27 ₀ ) and (27 ₁ ).

The valid information addition units (AAD) (27 ₀ ) and (27 ₁ ) are virtual channel conversion units (VCC) (2).
Each cell (C) included in the flow of cells (C) transmitted from 1) is a valid cell ( _CE ) or an invalid cell ( _CS ).
Identification information (S) indicating whether or not each cell (C)
0 system ATM switch (ATS) (1 ₀ ) or 1 system ATM switch (AT)
S) Enter in (1 ₁ ).

Effective information addition section (AAD) (27₀) And
(27₁) Is a 0-system ATM switch (ATS)
(1₀) And 1-system ATM switch (ATS) (1₁)
Which one is used as the active system and which is the standby system.
Test cell (C _T) Is added to
Virtual path identifier (VPI) and virtual channel identifier (V
CI) is notified in advance from a connection control system (not shown).
ATM switch currently operating as the active system
(ATS) (1₀) Corresponding effective information addition part (AA
D) (27₀) Is a virtual channel converter (VCC) (2
All cells (C) transmitted from 1) [ie communication cells
(C_C) And a test cell (C_T)] Is a valid cell
(C_E), And the valid cell (C_E)
Identification information (S) [hereinafter effective identification information (S_E)]
Is added to each cell (C) and the corresponding 0-system ATM switch
(ATS) (1₀), And currently operating as a standby system.
1-system ATM switch (ATS) (1₁) To
Corresponding effective information addition part (AAD) (27₁) Is virtual
Cell transferred from channel converter (VCC) (21)
Of (C), test cell (C_T) Only valid cells
(C_E), And the valid cell (C_E)
Effective identification information (S_E) Is added, but other cells
(C) [that is, the subscriber terminal (TE) (3₁) Sent from
Communication cell (C_C) Is an invalid cell (C_S), And nothing
Effective cell (C_S) Identifying information (S) [hereinafter
Invalid identification information (S_S)]] For each communication cell
(C_C), And the corresponding 1-system ATM switch (AT
S) (1₀).

The effective information addition section (AAD) (27 ₀ ).
As shown in FIG. 3, the identification information (S) generated by (27 ₁ ) and (27 ₁ ) is a signal separate from the cell (C) flow, and is parallel to the same time domain as that of each cell (C) and 0-system ATM. Switch (ATS) (1 ₀ ) or 1-system ATM switch (AT
S) The parallel signal format input to (1 ₁ ) and the ATM switch (ATS) (1 ₀ ) or (1 ₁ ) inserted in a part of each cell (C) as shown in FIG. The input signal format to be input is taken into consideration.

In the identification information (S ₁ ) of the parallel running signal format (part 1) shown in FIG. 3A, the invalid identification information (S _S ) is set to logic “1” and the valid identification information (S _E). ) Is set to logic "0".

In the identification information (S ₂ ) of the parallel running signal format (No. ₂ ) shown in FIG. 3B, the invalid identification information (S _S ) is set to logic “1” and the valid identification information (S 2). _E ) is set to logic "0" only in the time domain corresponding to the first 1 bit, and the remaining time domain is set to logic "1".

In the identification information (S ₃ ) of the parallel running signal format (part 3) shown in FIG. 3C, the invalid identification information (S _S ) is set to logic “1” and the valid identification information (S 3). _E ) is set by alternately changing to logic "0" and logic "1" for each time region corresponding to each 1 bit.

Meanwhile FIGS. 4 (a) inserting form shown in the identification information (S _H) (Part I) is inserted one bit in the header portion (HD) constituting each cell (C), invalid identification information (S _S) is set to a logic "1", the effective identification information (S _E) is set to a logic "0".

Further FIG. 4 (b) inserting form shown in the identification information (S _T) of (Part II) is inserted one bit in the tag portion (TAG) is added to each cell (C), invalid identification The information (S _S ) is set to a logical “1” and the valid identification information (S _E ) is set to a logical “0”.

Each 0-system ATM switch (ATS) (1 ₀ )
The 1-system ATM switch (ATS) (1 ₁ ) analyzes each tag (TAG) of each cell (C) to which the input identification information (S) is added, as in FIG. From the called party's subscriber response unit (LCT)
Communicate to (2 ₂ ).

In the subscriber response unit (LCT) (2 ₂ ), the 0-system ATM switch (AT
S) (transferred from 1 _0), all effective identification information (S _E) is added in the communication cell (C _C) and test cell (C _T), the corresponding buffer memory (BUF)
(28 ₀ ) and the identification information determination unit (ACK) (29 ₀ ).
To the test cell (C _T ) transmitted from the 1-system ATM switch (ATS) (1 ₀ ) that is being operated as a standby system, and the valid identification information (S _E ) is added to the other cells. (C) [i.e. communication cell (C _C)] invalid identification information (S _S) is added to cells in (C) stream, corresponding buffer memory (BUF) (28 ₁₎ and the identification information determination unit ( ACK) (29 ₁ ).

The identification information determination unit (ACK) (29 ₀₎ is
The identification information (S) added to each transmitted cell (C) is analyzed, and if the identification information (S _E ) is valid, the cell (C) to be added, that is, for all communication Cell (C _C ) and test cell (C _T ) are valid cells (C _E ).
And judgment, sequentially accumulated in the buffer memory (BUF) (28 _0).

On the other hand, the identification information judging section (ACK) (29₁)
Is the identification information added to each transmitted cell (C)
(S) is analyzed and effective identification information (S_E) Is
Is a cell (C) to be added, that is, a test cell
(C_T) Is a valid cell (C_E), The buffer memory
(BUF) (28₁), But invalid identification information
Report (S _S) Is the cell to be added
(C), that is, all other communication cells (C_C) Disabled
Cell (C_S), And the buffer memory (BUF) (2
8₁) And discard it.

As a result, the buffer memory (BUF) (2
8₀) Is a 0-system ATM switch operating as the active system.
(ATS) (1₀) For all communications transferred via
Cell (C_C) And a test cell (C_T) Are accumulated in sequence
Buffer memory (BUF) (28₁) Has a spare
1-system ATM switch (ATS) operating as a system
(1 ₁), The test cell (C_T)only
Are sequentially accumulated.

The buffer control unit (BFC) (2A) alternately monitors whether or not the cell (C) is accumulated in the buffer memories (BUF) (28 ₀ ) and (28 ₁ ). memory (BUF) (28 ₀₎ As a result of monitoring, the communication cell (C _C) or test cell (C _T) is detected that it is being accumulated, the earliest stored electrical one cell (C) Extract and identify information (S)
Is transmitted to the branch unit (DRP) (26).

Next, the buffer controller (BFC) (2A)
Does not continuously monitor whether or not the cell (C) is stored in the buffer memory (BUF) (28 ₀ ), and determines whether or not the cell (C) is stored in the buffer memory (BUF) (28 ₁ ). When it is detected that the test cell (C _T ) is accumulated, the one cell (C) that is accumulated earliest is extracted, the identification information (S) is removed, and the branch portion (D) is removed.
RP) (26) and then again to the buffer memory (B
UF) (28 ₀₎ to the cell (C) to monitor whether or not accumulated.

A buffer memory (BUF) (28 ₁ )
As a result of monitoring whether or not cells (C) are accumulated in
If the cell (C) was not at all accumulated immediately returns to monitoring whether the buffer memory (BUF) (28 ₀₎ to the cell (C) is accumulated.

As described above, the branching unit (DRP) (26) is equipped with the 0-system ATM switch (AT) currently in operation as the active system.
S) (1 ₀₎ all cells transferred via the (C)
[That is, communication cell (C _C ) and test cell (C _T )]
And the 1-system ATM switch (AT
S) and the test cell (C _T )] transferred via (1 ₁ ) are alternately transmitted.

As in the case of FIG. 5, the branching unit (DRP) (26) is a virtual path included in the header unit (HD) of each cell (C) transmitted from the buffer control unit (BFC) (2A). By analyzing the identifier (VPI) and virtual channel identifier (VCI), only the test cell (C _T ) transferred via the ATM switches (ATS) (1 ₀ ) and (1 ₁ ) of both systems is detected. Branch and transmit to the test cell inspection unit (TCC) (25), and the remaining subscriber terminals (T
The communication cell (C _C ) transmitted from E) (3 ₁ ) is transferred to the subscriber terminal (TE) (3 ₂ ).

The test cell inspection section (TCC) (25) is
As in the case of FIG. 5, the test cell (C _T ) transferred from the branching unit (DRP) (26) through the ATM switches (ATS) (1 ₀ ) and (1 ₁ ) of both systems.
, The data included in the payload part (PL) is collated with the above-mentioned predetermined test data, and the 0-system ATM switch (ATS) (1 ₀ ) and 1
Check the normality with the ATM switch (ATS) (1 ₁ ).

From the above, the 0th system A, which is in operation as the current system
The normality of not only the TM switch (ATS) (1 ₀ ) but also the 1-system ATM switch (ATS) (1 ₁ ) operating as a standby system is confirmed.

In this state, the test cell inspection unit (TC
C) When the (25) detects an abnormality in the test cell (C _T ) transferred via the 1-system ATM switch (ATS) (1 ₁ ) operating as a standby system, the connection control system not shown immediately Notification of abnormality detection to the AT
The M switch (ATS) (1 ₁ ) is made to execute the diagnosis / repair processing, and the maintenance person is requested to perform the diagnosis / repair work as necessary.

The test cell inspection unit (TCC) (2
5) 0-system ATM switch (AT
S) (1 ₀₎ through it transferred test cells (C _T)
When an abnormality is detected in the ATM switch (ATS) (1) which is operated as the active system, as in FIG.
₁ ) ATM switch (ATS) (1 ₁ ), which is operated as a standby system and whose normality has been confirmed.
Switch to the active system and resume operation without any problems.

As is clear from the above description, the present embodiment
According to this, the ATM switch (AT
S) (1₁) Is also a test cell (C_T) Regularly
Since the normality has been confirmed, it is currently operating as the active system.
ATM switch (ATS) (1 ₀) Became inoperable,
It can be used normally even if the operation is newly started.
And the ATM exchange can continue to operate normally.
It

2 to 4 are merely embodiments of the present invention, and, for example, the effective information addition unit (AAD) (27)
_The identification information (S) generated by ( ₀ ) and (27 ₁ ) is not limited to that shown in FIGS.
The identification information (S) is generated by synthesizing the various identification information (S ₁ ) to (S ₃ ) shown in (c), or the various identification information shown in FIGS. 4 (a) and 4 (b) ( Many other modifications can be considered, such as S _SH ) or ( _ST ) being composed of a plurality of bits, but the effect of the present invention does not change in any case. Further, the test cell input means (100), the identification information adding means (200), the effective cell selecting means (300) and the test cell inspecting means (400) which are the objects of the present invention.
Is not limited to what is shown in the figure, and many other modifications can be considered, but the effect of the present invention does not change in any case.

[0062]

As described above, according to the present invention, the ATM switch operating as a standby system in the ATM switch is also
Since the test can be performed in advance in the test cell and the normal system can be used as the active system, the AT
The reliability of the M switch is greatly improved.

[Brief description of drawings]

FIG. 1 is a diagram showing the principle of the present invention.

FIG. 2 is a diagram showing an ATM exchange according to an embodiment of the present invention.

FIG. 3 is a diagram showing identification information according to an embodiment of the present invention.

FIG. 4 is a diagram showing identification information according to another embodiment of the present invention.

FIG. 5 is a diagram showing an example of a conventional ATM exchange.

[Explanation of symbols]

 1 ATM Switch (ATS) 2 Subscriber Correspondence Section (LCT) 3 Subscriber Terminal (TE) 21 Virtual Channel Converter (VCC) 22 Test Cell Sender (TCG) 23 Insertion Section (INS) 24 Selector (SEL) 25 Test Cell Checking Section (TCC) 26 Branching Section (DRP) 27 Effective Information Adding Section (AAD) 28 Buffer Memory (BUF) 29 Identification Information Determining Section (ACK) 2A Buffer Control Section (BFC) 100 Test Cell Input Means 200 identification information addition means 300 effective cell selection means 400 test cell inspection means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location H04Q 11/04 8732-5K H04L 11/20 C 9076-5K H04Q 11/04 L (72) Inventor Shuji Yoshimura 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Within Fujitsu Limited (72) Inventor Shirou Uryu 1015 Kamikodanaka, Nakahara-ku, Kawasaki, Kanagawa Prefecture Within Fujitsu Limited

Claims (6)

[Claims] 1. An ATM switch having dual ATM switches (1 ₀ , 1 ₁ ), one of which is used as an active system and the other of which is used as a standby system, in which a test cell including predetermined test data is created. ,
The test cell input means (100) to be inserted into the cell flow input to the ATM switches (1 ₀ , 1 ₁ ) of both systems, and the total input to the ATM switch (1 ₀ ) operating as the active system. All cells and the AT operating as the backup system
Identification information indicating that the cell is a valid cell is added to the test cell input to the M switch (1 ₁ ) and the test cell input to the ATM switch (1 ₁ ) operating as the standby system is added. Identification information adding means (200) for adding identification information indicating that the cell is an invalid cell to cells other than the cell, and the cells added to the cells output from the ATM switches (1 ₀ , 1 ₁ ) of both systems. Analyzing the identification information that is
Effective cell selecting means for selecting and outputting only effective cells (3
00) and a test cell inspecting means for inspecting the normality of the test data included in the test cell by extracting the test cell from the effective cell flow output from the valid cell selecting means (300). 400) is provided. 2. The identification information adding means (200) sets the identification information in the same time region in parallel with the cells to which the identification information is added, in the respective ATM switches (ATS) (1).
₀ , 1 ₁ ) is input to the ATM switch test method according to claim 1. 3. The ATM switch test system according to claim 1, wherein the identification information adding means (200) adds the identification information to a predetermined portion of a cell to which the identification information is added. 4. The ATM switch test system according to claim 3, wherein the identification information adding means (200) adds the identification information to a header portion of a cell to which the identification information is added. 5. The ATM switch test method according to claim 3, wherein the identification information adding means (200) adds the identification information to a route information section of a cell to which the identification information is added. 6. The valid cell selecting means (300) switches the valid cell to the ATM switches of both systems when the valid cells are simultaneously output from the ATM switches (1 ₀ , 1 ₁ ) of the both systems. 2. The ATM switch test method according to claim 1, wherein the cells are alternately output from (1 ₀ , 1 ₁ ).