KR100237472B1 - Restarting method of subscriber backplane board in small atm switching system - Google Patents

Abstract

The present invention relates to a method for restarting a subscriber board of a small ATM switch which performs a restart command for resolving a failure of the subscriber matching board in the small ATM switch.

The present invention provides a method for restarting a board failure while a back board controller is provided that performs an operator of a management software system in charge of operation and maintenance and transmits the result to the management software system. If the board is not automatically repaired and the operator wants to reset the board arbitrarily by receiving the alarm signal for the fault, if the operator wants to reset the board arbitrarily, it checks whether it is mounted and if it is mounted, the controller of the shelf's backplane board. To signal power off / on. The controller of the backplane board searches for the fault slot and turns off the slot. After a delay, the slot is powered on and the result is transmitted to the management software system.

The present invention provides the convenience of not having to directly go to the system to reset or remove / mount the fault slot by powering off / on the fault slot in the backplane board in conjunction with the backplane controller.

Description

Restarting method of subscriber backplane board in small ATM switching system

The present invention relates to a method of restarting a subscriber board of a small ATM switch which performs a restart command for resolving a failure of the subscriber board in the small ATM switch.

In general, high-speed broadband network using Asynchronous Transfer Mode (ATM) technology has been realized as a network supporting multimedia communication according to the development of technology such as digitization of voice and video and optical fiber. ATM is a technology for freely allocating communication channels from low-speed, low-capacity communications to high-speed broadband communications. It divides the information to send by 48 bytes and adds 5 bytes of headers containing destination label information (receiving address). The information is sent in cell units of fixed length of 53 bytes. ATM cells are sent to the ATM network and exchanged in hardware at high speed, called self routing. (Self-routing is the selection of the communication path that the cell wants to go to itself according to the header information.) A cell arriving at the intended receiver is reconstructed with the actual information after checking the header.

ATM technology is the basis for multimedia communications that can provide a variety of applications such as video telephony, video conferencing, postal services such as mailboxes in a network, and video on demand services. For example, if you need to exchange voice, video, and video at two or more points (one-to-one, group-to-group), such as video conferencing, both parties must have the same amount of information (channels), but this is unrealistic. Because audio can be compressed from 64kbps to 16kbps when digitally compressed, and the video requires 1.5 ~ 6Mbps transmission capacity even when using MPEG video compression technology. When exchanging data at the same time, more bandwidth than 10Mbps is required.

Therefore, it is necessary to allocate video, audio, and data to different virtual channels to satisfy each request independently in an ATM network that provides a communication channel of a necessary band according to the communication partner and the contents of communication.

An example of a desktop multimedia conferencing system using an ATM network is shown in FIG. In such a desktop environment, a small desktop size (hereinafter, referred to as a 'small ATM switch') is used as an ATM switch.

In FIG. 1, a desktop multimedia conferencing system includes a high-speed broadband ATM network composed of small ATM switches (100, 110, 120, and 130) for guaranteeing a quality of service, and a terminal capable of processing data centering on text and displaying of video and voice (PC, workstation). ) A database (DB) that has a basic configuration and stores conference information as needed, a Multipoint Control Unit (MCU) that multiplexes data of multiple conferences, a hub with a router function, etc. This may be added.

On the other hand, a general exchange system includes a function for operation and maintenance, which is performed through an operation and maintenance processor (OMP) in the exchange system, or It is performed by an external computer system such as a workstation (Workstation, W / S) or a personal computer (PC). In other words, functions related to operation and maintenance in the exchange system are intensively performed by OMP, and the connection between the operator's console (or PC) and the exchange system is made by RS-232C. Since it has a transmission speed of 9600bps, high-speed data transmission is difficult.

Therefore, it is desirable to use a high performance computer such as an external workstation as a console for operation and maintenance in the ATM exchanger, and to be connected to the exchange system by the ATM method.

If a failure occurs in the small ATM exchanger, causing the subscriber board to become inoperable, the administrator resets the subscriber board or restarts the subscriber board in order to restart the subscriber controller. This will confirm the board operation. If it is not restarted by resetting subscriber board or power off / on, subscriber board should be replaced, but it may be restarted and operate normally.

In reality, the administrator must go directly to the system to find the failed board and perform a disconnect / mounting check procedure that resets or powers off / on the board.If the check actually fails, the board will be replaced. If you do, it's a hassle for the administrator to go directly to the system and perform the check.

Accordingly, the present invention has been made to solve the above problems, by turning off the power of the slot in the failure of the slot controller through a new operator command to turn it back on to take effect of the removal / mounting of the subscriber board The purpose is to provide a method for restarting a subscriber board of a small ATM exchange obtained.

In order to achieve the above object, the present invention provides a method for restarting a board failure while a back board controller is provided to perform an operator of a management software system in charge of operation and maintenance and transmit a result to the management software system. The management software system receives an alarm signal for a hernia and a failure of the board, searches for the corresponding shelf and checks whether the board is in a mounted state; Calculating a shelf's backboard address value when the shelf is mounted, and then transmitting a signal requesting power off / on to a controller of the backboard; Searching for a corresponding slot in a controller of the backboard; Turning off the power of the slot; And turning on the corresponding slot after a predetermined time delay and delivering the result to the management software system.

1 is a block diagram of a desktop multimedia conference system using a small ATM network;

FIG. 2 is a block diagram showing a configuration example in which a workstation which is in charge of maintenance of a general ATM switching system and a switching system is connected;

3 is an external view of a subscriber and trunk line matching backplane board (BSBB) in a small ATM switch;

4 is a flowchart illustrating a method for restarting a subscriber board in software according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

FIG. 2 is a block diagram showing a configuration example in which a workstation which is in charge of maintaining a general ATM switching system and a switching system is connected.

The ATM switching system is comprised of a user matching interface (UNI), a switch network, a network node interface (NNI), and a processor that controls them. Looking at the physical structure of the ATM switching system, the call processing function is realized in a horizontal distributed structure, and the maintenance function is realized in a vertical distributed structure.

The call processing function is distributed and performed in ATM Local Switching Subsystem (ALS), which provides services to subscribers or other exchanges. For example, signaling protocol processing for subscribers or relay lines connected to ALS. Functions, connection connection function, call connection function and number translation function are performed in each ALS.

The maintenance function is that if the originator and the called party are not in the same ALS, the connection between the required ALSs is via the ATM Central Switching Subsystem (ACS), for example, each ACS The ALS consists of a vertically distributed structure that commands statistical measurements, maintenance tests, troubleshooting, etc., and notifies the ACS of various data.

The UNI / NNIs that can be connected to ATM switching systems are 155Mbps STM-1 level UNI, DS3 level, DS1E level low and medium speed UNI, 155Mbps STM-1 level NNI, and 622Mbps STM-4 level NNI.

As shown in FIG. 2, such an ATM switch may be classified into an ATM Local Switching / Subscriber subsystem (ALS / S) 210, an ATM Local Switchig / Trunk subsystem, and an ATM Local Switching / Trunk subsystem (ALS / T). 220, ATM central switching subsystem (ACS) 230. In addition, the ALS / S 210 may include as many Subscriber Interface Modules (SIMs) as indicated by the number of subscribers, and an Access Switching Network Module (ASNM) to accommodate the SIMs 211 and 212. , Call & Connection Control Processor (CCCP: 214) for controlling the subsystem, and the ALS / T 220 includes Trunk Interface Module (TIM: 221, 222) as many trunks as possible. It is composed of an Access Switching Network Module (ASNM) 223 accommodating this, and a Call & Connection Control Processor 224 (CCCP) for controlling the subsystem.

In addition, the ACS 230 is composed of an interconnection switch network module (ISNM) and an operation preservation processor (OMP, 232), the OMP 232 is a cell multiplexing and demultiplexing block (CMDH: Call Mux / Demux H / W Assembly (233), ATM Cell Generator (SCA) (Sbus interface Processor Communication board Assembly, 234), ATM Main Processor Board Assembly (AMPA), and AMPA (235) Disk 236, cartridge tapes CT, 237, and the like.

And, it is composed of a workstation (W / S, 240) that is connected to the Ethernet and AMPA 235 of the OMP 232 to perform the maintenance management command of the operator.

In generating executable software and hardware for the functions of each block specified in an ATM switch system, a software task refers to generating source code, and a hardware task refers to a printed board assembly that can be implemented in an ATM switch system. ) To develop.

Broadband subscriber and trunk interface backplane boards (BSBBs) in ATM exchanges The PBA accommodates subscriber and trunk line matching boards. The ATM Switch BSBB has a basic rate subscriber interface board assembly (BSIA) for 155Mbps subscriber matching, a medium rate subscriber access board assembly (MSAA) for DS-3 matching, basic rate trunk interface board assembly (BTIA) for 155Mbps relay line matching, 622Mbps The matching high rate trunkphysical layer interface board assembly (HTPA) and high rate trunk ATM layer interface board assembly (HTAA) are mounted.

Also on the back of the BSBB is a basic rate subscriber / trunk line interface board assembly (BSLA) for processing 155 Mbps optical signals for line interfaces, high rate trunk line interface board assembly (HTLA) for 622 Mbps optical signals, and DS-3. Medium rate subscriber line interface board assembly (MSLA) for line interface is mounted.

3 is an external view of a subscriber and repeater line backplane board (BSBB) in a small ATM switch.

The BSBB has 16 slots (S01 to S16). The BSBB is equipped with a subscriber and relay line matching board in each slot on the front side of the BSBB, and a line interface board is mounted on the back side of the BSBB. Then, there is one dip switch S17 that represents the logical address (identifier, ALS ID) of the ALS on which the BSBB is mounted, which represents the address in units of shelves. In addition, each slot of the BSBB includes PBA address dip switches SD1 to SD16 for setting logical addresses (identifiers and PBA IDs) of PBAs mounted in the slots.

On the other hand, maintenance and management functions include the start-up function required when the system is first operated after the ATM switch is installed, or when the software version is replaced, and an alarm output control function that informs the system of a failure state. The alarm signal for hernias and disorders is divided into four categories.

PBA Eject Failure (PEF) refers to PBA hernia, which tells other PBA that a hernia is a PBA unit and is detected by another PBA.

Down Function Failure (DFF) is a PBA failure that cannot communicate a failure status to the upper processor by IPC. It informs other PBAs of hernias in PBA units and detects them in other PBAs.

APEF (All PBA Eject Failure) Refers to all PBA hernias. The cable is notified to the alarm gathering interface board assembly (AGIA) that all PBAs are hernias.

ALFE (All PBA Function Failure) It means that all PBAs are faulty, so it can't transmit the fault status to the upper processor.

4 is a flowchart illustrating a method for restarting a subscriber board in software according to the present invention.

The present invention is a method for searching and restarting a failed subscriber board through a backboard controller for controlling a subscriber board. In order to do this, a signal related to restart between a management software system and a backboard controller in charge of operation and maintenance must be registered in advance. On the backboard, the slot board must be able to control the power of the slot board.

PBAs mounted in subracks of subscriber and trunk line matching backplane boards (BSBB) include subscriber and trunk line matching boards (BSIA, MSAA, BTIA, HTPA, HTAA) and line interface boards (BSLA, MSLA, HTLA). .

When an alarm signal related to a hernia and a fault generated in a board is transmitted to the management software system, the subrack and shelf are searched by the operator to reset the board arbitrarily if the failed board is not automatically recovered. Check if there is (b).

If the subracks and shelves are not mounted, the results are sent to the management software system. If the subracks and shelves are mounted, the address value of the corresponding backplane board is calculated, and the controller of the backplane board is restarted. Pass the signal to (c). At this time, the address value of the backplane board is an address of a shelf unit, and is a logical address (ALS ID) of the ALS indicated in the dip switch S17 (see FIG. 3).

The controller of the backplane board receiving the restart signal executes control to perform the operation of powering off and on the failed board.

The controller of the backplane board searches 16 slots, finds the corresponding slot that has failed, calculates its address (d), and powers off the slot (e). At this time, the address value of the slot is the logical address (PBA ID) of the PBA displayed on the dip switches (S0 to S16, see Fig. 3) attached to each slot.

After the fault slot is off and there is a predetermined time delay, the slot is powered on again and the result is returned to the management software system (f).

Powering off and on the failed slot will have the effect of a real detachment / mounting, and if the reset is restarted and resumes normal operation, the failure management system will return to standby. The faulty slot must be replaced.

The subscriber board restart method suggested in this paper for the system construction aimed at remote unmanned system can be applied to the switch board in the small ATM switch, etc., so that the fault board can be automatically recovered by software.

Although the present invention has been described in terms of specific embodiments only, those skilled in the art can make various changes within the spirit of the claims and embodiments.

As described above, the present invention provides convenience in that the administrator does not have to directly go to the system and reset or remove / mount the fault slot by turning off / on the fault slot in the backplane board in conjunction with the backplane controller.

Claims (1)

A method for restarting a board failure while having a backboard controller that performs an operator of a management software system in charge of operation and maintenance and transmits the result to the management software system, (B) a management software system for a subscriber board which is not automatically restored, searching for a corresponding subrack and a shelf of the board and confirming that it is mounted; (C) calculating a backplane board address value and transmitting a signal requesting power off / on to a controller of the backplane board when the subrack and the shelf are mounted; (D) calculating and searching an address value of a failed slot in the controller of the backplane board; (E) turning off the power of the slot; And (f) turning on the power of the slot after a predetermined time delay and delivering the status result of the slot to the management software system.

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