JPH08242237A - High speed execution method for diagnosing atm subscriber switch - Google Patents

Abstract

PURPOSE: To drastically shorten diagnostic time by diagnosing all common parts stuck to ATM subscriber switches in parallel. CONSTITUTION: A link is established by the diagnosis of a wide band signal controller 2 through an SBY in a duplicated B-ISDN exchange system. Reset processing is applied to a wide band signal controler common part 3 through an ACT, fault information is read out and checked, diagnosis starting processing is executed, and a diagnostic result is checked. Then fault information is read out from respective common parts 3 and checked through the SBY, diagnosis starting processing is executed and respective common parts 3 stuck to ATM subscriber switches 4 are simultaneously diagnosed by checking diagnostic results. In this diagnostic method, efficient diagnosis can be executed and time required for singularizing the system can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a dual B-ISD.
The present invention relates to a method for diagnosing an SP system of an N exchange system. B-
ATM (Asynchronous Transfer Mode) used in ISDN (Broadband ISDN) is a transfer mode for efficiently transmitting all kinds of information with different characteristics, and it is a high speed in units of 53 bytes of 53 bytes of header 48 bytes for data 48 bytes. Owns an ATM subscriber switch for multiplex switching.

FIG. 6 shows a system configuration diagram of the SP system (call path system) of the duplexed B-ISDN exchange system. In the figure, 11 is a central controller (CC), 12 is a wideband signal controller (BSGC), 13 is a wideband signal controller common part (BSGCCOM), 14 is an ATM subscriber switch, and 15 is a subscriber interface common part (SIFCOM). ), 16 is an individual unit, 17 is a common bus.

The central control unit 11 is duplicated in the ACT system and the SBY system, and the system is switched from the ACT system to the SB system by a switching path.
The system down is prevented by constantly switching to the Y system. ATM subscriber switch 14 is 0 side (SIDE0)
And a 1 side (SIDE1), a subscriber interface common section 15 is connected to the 0 side, and a wideband signal controller common section 13 is connected to the 1 side.

The individual unit 16 composed of subscriber units is composed of seven groups, each connected to the common unit interface unit 15 of the ACT system or the SBY system, and the ATM subscriber switch 14 has the 0 unit.
Connected to the side. However, as the configuration of the SP system device becomes large, it takes a lot of time to execute the processing for the ATM subscriber switch diagnosis.

[0005]

2. Description of the Related Art FIG. 7 shows a system configuration example of conventional ASSW (ATM subscriber switch) diagnosis. The figure shows ASS
A configuration diagram of only one side of the W duplex configuration is shown. For diagnosis, one side of the duplex ASSW device is out of service (O
US) state and the other side service state is in operation (IN
Diagnosis is performed after disconnecting from the ASSW device in S). This is to prevent the ASSW device in the INS state from being adversely affected.

In the figure, 21 is a CC (central control unit),
22 is a PIF (peripheral interface), 23 is a BSGC (broadband signal controller), 24 is a BSGCCOM (broadband signal control common part), 25 is an ASSW (ATM subscriber switch), 26 is a COM (common part), and 27 is an NHW. (Network highway), 28 indicates CHW (chain highway).

The NHW 27 consists of 16 highways from 00 to 15, and the CHW 28 consists of 8 highways from 00 to 07. COM26 is SIFCOM (for subscriber interface), SBMHCOM (for subscriber message handling), G
ENHCOM (for handling inter-office messages), FIFCOM
(For inter-station transmission), LOOPCOM (for loop transmission), etc.

The diagnosis target range of the ASSW diagnosis is composed of BSGCCOM24, ASSW25 and each COM26 surrounded by a thick frame. Each COM unit 26 is connected to the ASSW 25, and a maximum of 16 (NHW00 to 15) are connected. Furthermore, one COM part
26 to 8 (CHW00 to 07) COMs 26 can be connected in a chain. Therefore, the number of COMs connected to one side of one ASSW device is 16 × 8 = 128.

The control route for the ASSW diagnosis is the CC device 21.
Control BSGC23 via PIF22 from BS
Diagnose GCCOM24. ASSW device 25 is PIF22
Be diagnosed via. Each COM device 26 is from CC21 to BSG
Control C23 to control LAP-D (link access method)
Check each COM26 with.

The main outline of the test procedure for the ASSW diagnosis is as follows. ． Test the ASSW device via PIF. ． Test BSGCCOM via PIF. ． Each COM part is NHW / one by LAP-D control.
Test every CHW. The problem here is the test method described above.

FIG. 8 shows an example of a conventional COM section diagnosis procedure.
The figure illustrates a diagnosis flow for the diagnosis of the 1COM unit. The diagnostic processing flow between a CC apparatus, a BSGC apparatus, and each COM part (OUS state) is shown. (1) When a COM unit reset request is issued in the CC device, a reset request is issued to each COM unit via the BSGC, and retry can be performed up to three times. (2) If you catch the link release in the third retry,
CC unconditionally waits 7 seconds. (3) Clear the BSGC counter and request reestablishment of the opened link. (4) Respond to the CC to reestablish the link from the released link. (5) The CC issues an EMSCN (extended maintenance scan) read request to the COM section, and the COM section issues the CC
An EMSCN read response is sent back to. (6) The reset completion bit is checked in CC, (7) The diagnostic start request is issued from CC, the link is released and C
The OM part is diagnosed and activated, and it is retried up to 3 times in a maximum of 10 seconds. During this time, the CC will unconditionally wait for 15 seconds. (8) BSGC issues a link release notification to CC, disconnects the link, and CC checks the link release. The CC unconditionally waits 55 seconds until the diagnosis is completed. (9) The BSGC counter is cleared, a link re-establishment request is issued, link re-establishment is retried 3 times in the same manner as described above, and a link re-establishment response is made, and the CC performs a link re-establishment response check. (10) The CC issues a diagnostic result read request to the COM unit to read the diagnostic result, the COM unit issues a diagnostic result read response to the CC, and the CC checks the diagnostic result.

As described above, the conventional diagnostic method uses 1 CO
Maximum of 7 seconds + 15 seconds + 55 seconds = 77 seconds for diagnosis of M part, CC
It takes about 1 minute or more per 1 COM.

[0013]

In the conventional test method,
Since a maximum of NHW × CHW = 16 × 8 = 128 units can be connected to each COM unit, the diagnostic execution time increases as the number of COM units connected to the ASSW increases. During the ASSW diagnosis, one system of the ASSW device duplication is disconnected and the diagnosis is performed in the OUS state. Therefore, the longer the diagnosis time is, the more the single operation is interrupted and the reliability of the system is lowered.

Currently, the test execution time is as follows. That is, assuming that the diagnosis execution time per COM is 1 minute, the maximum COM execution time is NHW16 × CHW.
8 x 1 minute = 128 minutes (2 hours and 8 minutes). Therefore, in the conventional test method, since each COM is tested, a maximum of 2 hours is required.

It is an object of the present invention to significantly reduce the diagnosis time by adopting a method of diagnosing all COM parts at the same time instead of diagnosing each COM part.

[0016]

FIG. 1 is a block diagram showing the principle of the diagnostic method of the present invention. FIG. 1A shows a diagnostic route via the SBY system, and FIG. 1B shows a diagnostic route via the ACT system. The figure shows the system configuration of the ATM subscriber switch (ASSW) diagnosis of the present invention. After establishing the link via SBY, each COM unit is reset by the ACT system and the diagnostic check of each COM unit is performed by the ACT system. Then, the failure information of each COM unit is read via SBY to check the diagnosis result.

In the figure, 1 is a central control unit (CC),
2 is a wideband signal controller (BSGC), 3 is a wideband signal controller common unit (BSGCCOM), 4 is an ATM subscriber switch (ASSW), 5 is a subscriber interface common unit (SIFCOM), 6 is an individual unit, 7 is Indicates a common bus.

The central control unit 1 is duplicated in the ACT system and the SBY system, and the system is switched from the ACT system to the SB system by a switching path.
The system down is prevented by constantly switching to the Y system. ATM subscriber switch 4 is 0 side (SIDE0)
And the 1 side (SIDE1), the subscriber interface common section 5 is connected to the 0 side, and the wideband signal controller common section 3 is connected to the 1 side. ． LAP establishment test (via SBY) LA for SBY subscriber interface common part 5
The P (link access) establishment route is from the SBY-system central control device 1 to the SBY-system wide-band signal control device 2 and to the SBY-system wide-band signal control device common unit 3 to the SB.
It is connected to the subscriber interface common section 5 connected to the Y-system ATM subscriber switch 3. ． Subscriber interface common section self-diagnosis test Individual section 6 via SBY system subscriber interface common section 5
Basically, the diagnostic test is performed by the microprocessor (μP) of the individual unit 6 for self-diagnosis. That is,
Diagnosis is to isolate the faulty package by starting the diagnosis point and receiving the diagnosis result.

The diagnostic test for the individual unit 6 via the common unit 5 for the ACT subscriber interface is basically performed by the other individual unit 6.
It is handled in the same manner as (subscriber interface common unit 5). The trigger of ACT diagnosis is to be diagnosed even if even one route of the LAP establishment test fails in the SBY system route in the diagnosis of the wideband signal control device common unit 3. ． Test using TCG (Test Cell Generator) As ATM cell diagnosis using TCG, ATM subscriber switch 4 × 4 root cell continuity test, and P6, P
7 There is a designated cell continuity test. The cell diagnostic route of the SBY system subscriber interface common unit 5 is based on the diagnostic route from the ACT system subscriber interface common unit 5.

[0020]

In the present invention, in order to diagnose all COMs (common part) at the same time, it is necessary to make the conventional diagnostic processing flow into a configuration capable of performing simultaneous processing. The basic processing flow of the ATM subscriber switch diagnosis parallel execution processing of the present invention is shown in FIG. In the figure, If the processing units shown in FIG. 2 are parallelized, the diagnosis of each COM unit can be shortened as follows. The diagnostic route is shown in Figure 1.
Diagnostic routes via ACT / SBY are shown in (a) and (b). With this diagnosis processing configuration, the diagnosis execution time of the maximum COM part can be realized as follows.

Diagnostic execution time for maximum COM = COM unit reset processing time via ACT (15 seconds) (2) + Fault information read via ACT check time (1 second) × NHW16 × CHW8 (3) + COM section diagnostic processing via ACT Time (40 seconds) (4), (5) + Checking fault information via SBY Check time (1 second) × NHW16 × CHW8 (6) (+ (7), (8) For (4), (5) If it cannot be executed, it is executed.) = 15 seconds +128 seconds +40 seconds +128 seconds = 311 seconds (5 minutes 11 seconds) The result is more than the above, and the execution time is greatly shortened compared to the conventional example.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the parallel COM unit diagnosis procedure of the present invention is shown in FIGS. The figure shows SIFCOM (for subscriber interface), SBMHCOM (for subscriber message handling), GWMHCOM (for interoffice message handling), F
COM (common unit) for IFCOM (for inter-station transmission) and LOOPCOM (for loop transmission) is shown.

Diagnosis is CC (Central Control Unit) and BSGC
(Broadband signal controller) and ACT-COM1 unit (ACT
System common part 1), SBY-COM1 part (SBY system common part 1), ACT-COMn part (ACT system common part n), and SB
The sequence between the Y-COMn part (SBY common part n) is shown.

In FIG. 3, FIG. 4 and FIG. BSGCCOM Diagnostic Procedure In response to a link establishment request from the SBY-COM1 unit from the CC, LAP (link access) is performed on the SBY-COM1 unit, and the SBY-COM1 unit notifies the CC of link establishment. Similarly, the link is established in the SBY-COMn section. Next, the CC issues a reset request to the SBY-COM1 unit three times, and the reset is performed by the third time. At the same time, the BSGC counter is cleared. In the same manner, a reset request is issued to the SBY-COMn section and the SBY-COMn section is reset by the third time. After that, it waits 15 seconds unconditionally for the completion of reset. . COM diagnosis procedure via ACT When the ACT-COM1 unit issues a reset request to the SBY-COM1 unit in response to a link establishment request of the ACT-COM1 unit from the CC, the SBY-COM1 unit is reset. Similarly, the SBY-COMn unit is reset by a link establishment request of the ACT-COMn unit.
After that, it takes 10 seconds to wait for the reset completion.

Next, E of ACT-COM1 part from CC
In response to the MSCN (maintenance scan) request, the EMSCN of the other system is read, and the CC receives a reset completion check from the ACT-COM1 unit by echo back.
Similarly, the data is also received from the ACT-COMn unit.

EMS of ACT-COM1 part of CC
The EMSCN check result of the other system failure is received by the CN request. Similarly, the data is also received from the ACT-COMn unit. Further, in response to a self-diagnosis activation request for the other system from the ACT-COM1 unit from the CC, the diagnosis of the other system is started. Similarly, the other system diagnosis of the ACT-COMn part is started. (See FIG. 3 above.) CC is a diagnostic completion bit look-in, so ACT-CO
The EMSCN request is issued to the M1 unit, the EMSCN of the other system is read, and the completion diagnosis of the other system is checked. Similarly in the following
Issue an EMSCN request to the CT-COMn part, and EM of other system
The SCN is read, and the completion diagnosis of the other system is checked. Retry this operation. .COM diagnostics procedure via SBY After the above retry is completed, unconditionally wait 1 second for the DSGC read counter to be cleared. After that, the SBY-COM1 part re-link establishment request from the CC causes 3
It takes 6 seconds to establish a link after the retry, and a relink establishment response is sent to the CC. Similarly, in the same manner, the SBY-COMn part re-link establishment request from the CC is retried three times and responded.

Next, E of SBY-COM1 part from CC
Due to MSCN request, SBY-COM1 part is EM of own system
Read SCN, CC is EM from SBY-COM1 part
After receiving the SCN, the self-system reset completion check and the self-system failure EMSCN check are performed after the third retry. The same applies to the SBY-COMn portion in the same manner. (Refer to FIG. 4 above.) Furthermore, in response to a self-diagnosis activation request for the SBY-COM1 unit from the CC, self-diagnosis activation of the SBY-COM1 unit is performed, and after three retries, a link release notification is sent from the BSGD to the CC. Then, the read counter of BSGC is cleared. During this time, CC unconditionally requires a waiting time of 15 seconds. Similarly, a waiting time of 15 seconds is unconditionally required for the self-diagnosis start of the SBY-COMn unit. It takes 15 seconds after the completion of the process and a waiting time for completion of diagnosis.

Further, in response to a relink establishment request of the SBY-COM1 part from the CC, the link of the SBY-COM1 part is reestablished, and 6 seconds are required for retrying three times during that time, and a relink establishment response is sent to the CC. Notice. Similarly, S
Even after the link establishment request of the BY-COMn part, the re-link establishment response is notified after 6 seconds.

Further, in response to a request from the CC for the diagnostic result of the SBY-COM1 part, the SBY-COM1 part will be operated by the own system EMSC.
The N is read and the CC receives the diagnosis result from the SBY-COM1 unit and checks the self-system diagnosis result. This operation is retried 3 times. In the same manner, the diagnosis result request of the SBY-COMn unit is performed in the same manner, and the CC retries the self-system diagnosis result check three times and ends. (See Figure 5 above)

[0030]

According to the diagnostic method of the present invention, efficient diagnostic execution can be achieved, and it becomes possible to significantly reduce the time for which the system is unified. Further, there is an effect that the search time for pointing out a failure can be shortened.

[Brief description of drawings]

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

FIG. 2 is a basic processing flow of the diagnostic method of the present invention.

FIG. 3 is an example (1) of a procedure for diagnosing a parallel COM unit.

FIG. 4 is an example (No. 2) of the parallel COM unit diagnosis procedure.

FIG. 5: Example of parallel COM part diagnosis procedure (Part 3)

[Fig. 6] System configuration example of a redundant system

FIG. 7: Example of system configuration of conventional ASSW diagnosis

FIG. 8: Example of conventional COM section diagnosis procedure

[Explanation of symbols]

1, 11, 21 Central control unit (CC) 2, 12, 23 Wideband signal control unit (BSGC) 3, 13, 24 Wideband signal control unit common part (BSGCCO)
M) 4,14,25 ATM subscriber switch (ASSW) 5,15 Subscriber interface common part (SIFCOM) 6,16 Individual part 7,17 Common bus 22 PIF (peripheral interface) 26 COM (common part) 27 NHW ( Network Highway) 28 CHW (Chain Highway)

Claims (1)

[Claims] 1. An ACT system and an SB system for diagnosing an SP (communication path) system of a duplexed B-ISDN switching system.
In the ATM subscriber switch diagnosis parallel execution processing for simultaneously diagnosing all the common parts connected to the common part of the subscriber interface by the diagnosis route via the Y system, the link is established by the diagnosis of the wideband signal controller via SBY, and the ACT is executed. Performs reset processing for each common part, reads and checks fault information of each common part via ACT, performs diagnostic start processing of each common part via ACT, and checks diagnostic results of each common part via ACT After that, the failure information of each common part is read and checked via SBY, and the diagnostic start processing of each common part is performed via SBY.
An ATM subscriber switch diagnosis high-speed execution method characterized in that the common parts attached to an ATM subscriber switch are simultaneously diagnosed in parallel by checking the diagnostic result of each common part via BY.