KR100195059B1 - Method of Handling Mounting of Low to Low Speed Subscriber Board in ATM Switching System - Google Patents

Abstract

The present invention relates to a method for processing a detachment of a medium to low speed subscriber board in an ATM switch, the method comprising: receiving a detach / mount signal; Determining whether a predetermined timer for periodic testing of the board is registered and stopping the timer if registered; If the type of the board is a medium speed subscriber matching board (MUIA) and the previous state of the MUIA is implemented, the MUIA is reported to the predetermined subscriber call processing processor (SCP); Treating the hernia state, if the type of the board is MUIA and the previous state of the MUIA is hernia, reporting to the SCP that the MUIA is mounted, and treating it as a mounted state; If the type of board is a low speed subscriber matching board (LUIA), determining a board number of the LUIA; If the previous state of the LUIA in which the number was determined is mounting, report to the SCP that LUIA has been herniad, and then process it as a hernia and if the previous state of the LUIA in which the number is determined is hernia, indicate that the LUIA has been mounted. Including the step of reporting to, and processed in a mounted state has the effect of accurately managing the subscriber link.

Description

Method of Handling Mounting of Middle-Speed Subscriber Board in ATM Switching System

1 is a block diagram showing an example of an ATM switch to which the present invention is applied.

2 is a flow chart showing a board mounting and processing method according to the present invention.

(A)-(c) of FIG. 3 is a format diagram of a typical ATM cell.

* Explanation of symbols for main parts of the drawings

1-0 to 1-7: Subscriber Switching Subsystem (ALS)

2 Central Switching Subsystem (ACS) 3 ISNM

4: NSCM

10-0 to 10-6: Medium and low speed subscriber registration module (MSIM)

11-0 ~ 11-8: Low speed subscriber matching board (LUIA)

12: medium and low speed subscriber registration control board 20: subscriber switching module (ASNM)

21,23: link interface block 22: subscriber switching block

211,212,231,232: Local Link Matching Board (LLIA)

221: switching memory board (SMEA) 222: switching control board (SPTA)

ALS: ATM Local Switching subsystem

ACS: ATM Central Switching Subsystem

ISNM: Interconnection Switching Network Module

NSCM: Network Synchronization Control Module

LUIA: Low speed User Interface board Assembly

ASNM: Acess Switch Network Module

LLIA: Local Link Interface board Assembly

SMEA: Switch Memory board Assembly

SPTA: Switch Processor and Timing board Assembly

SCP: Subscriber Call Processor

The present invention relates to a technique for handling the mounting and hernia state of the medium or low speed sudden board to match the medium or low speed subscriber in the ATM exchange.

Recently, with the rapid growth of the multimedia field, the B-ISDN (Broadband Integrated Services Digital Network) has emerged due to the demand for a communication network for digitally transmitting broadband signals such as video signals. With the advent of broadband ISDN, it is possible to meet various service needs of users, and in particular, it is possible to transmit moving images, thereby becoming a foundation for realizing the dream of the future information society.

The B-ISDN requires an ATM exchange technology. The ATM transfers information using a fixed length (53 bytes) information block called a cell using the ATDM method. Here, as shown in FIG. 3 of the ATM cell, a 5-byte header (H: Header) section and a 48-byte user information section are distinguished, and the 5-byte header is defined in the User Network Interface (UNI). The header structure is divided into a header structure and a header structure at a network node interface (NNI), and a header structure at a user network interface (UNI) has a first byte of 4 bits and a generic flow control (GFC). It consists of a 4-bit Virtual Path Identifier (VPI), the second byte consists of a 4-bit Virtual Path Identifier (VPI) and a 4-bit Virtual Channel Identifier (VCI). The third byte is composed of 8 bits of virtual channel identification number (VCI), and the fourth byte is 4 bits of virtual channel identification number (VCI), 3 bits of payload type (PT) and 1 bit of Cell Loss Priority (CLP), and the fifth byte contains an 8-bit header error. It consists of: (Header Error Control HEC).

Also, when looking at the header structure at the network node interface (NNI), the general flow control (GFC) in the first byte of the user network interface (UNI) described above is used as the virtual path identification number (VCI). It can be seen that the header structure of the user network interface (UNI) is the same.

In ATM technology, ATM switches are generally designed to access high-speed subscribers of 155.520 Mbps, but there is a problem in that resources are excessively wasteful to connect existing low- and medium-speed subscriber networks at high speed. Therefore, it is preferable to design a high speed subscriber as well as a low speed (DS1E class) and medium speed (DS3 class) subscribers. For this purpose, a subscriber registration board for interfacing medium low speed subscribers is provided in the exchange.

However, in order to manage such a medium speed subscriber board to provide various services, it is necessary to accurately report the mounting and hernia states of the physical layer boards (medium speed subscriber matching boards and low speed subscriber matching boards) to the management plane.

Accordingly, an object of the present invention is to provide a method for processing a mounting and closing of a low and low speed subscriber registration board for matching low and low speed subscriber in an ATM switch.

In order to achieve the above object, the method of the present invention, in the ATM switching apparatus for connecting the medium and low speed subscriber to exchange ATM cells, receiving a demount / mount signal generated from a predetermined medium speed subscriber matching board or low speed subscriber matching board Doing; Determining whether a predetermined timer for periodic testing of the board is registered and stopping the timer if it is registered; If the type of the board where the disconnect / mount signal is generated is MUIA and the previous status of the middle speed subscriber matching board is mounted, the status of the medium speed subscriber matching board is reported to the predetermined subscriber call processing processor (SCP). Treating with; Reporting to the SCP that the middle speed subscriber matching board is mounted if the type of the board on which the detach / mount signal is generated is a medium speed subscriber matching board and the previous state of the middle speed subscriber matching board is hernia, and processing the mounted state; Determining a board number of the low speed subscriber matching board if the type of the board on which the detach / mount signal is generated is a low speed subscriber matching board (LUIA); If the previous state of the low speed subscriber matching board, the number of which is determined, is mounted, reporting to the SCP that the low speed subscriber matching board is herniad, and then processing the hernia state and transferring the low speed subscriber matching board of which the number is determined. If the status is a hernia, the low-speed subscriber registration board is characterized in that it comprises a step of reporting to the SCP, and then mounted in a mounted state.

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

FIG. 1 is a block diagram showing an example of a configuration of an ATM switch to which the present invention is applied. The configuration includes a subscriber switching subsystem (ALS: 1-0 to 1-7) for connecting subscribers and exchanging primary cells. It is largely divided into Central Switching Subsystem (ACS) 2, which performs the interconnection function between ALSs and acts as a distribution device for high-capacity systems.

In addition, the subscriber switching subsystem (ALS: 1-0) includes a self routing switch module (ASNM) 20, and includes a plurality of medium to low speed subscriber matching modules (MSIM0 to MSIM6) for matching low to medium speed subscribers. : 10-0 to 10-6), and when the number of subscriber-side links is n and the number of link-side links is m, it has an aggregation function of n: m. In this case, the self-writing means that a routing header is attached before each cell enters the switch network, and the head network uses this head to output the corresponding port by hardware logic.

The Central Switching Subsystem (ACS: 2) is a pure inter-connector with no call processing process for varying information between ALSs, Interconnect Switch Network Module (ISNM: 3) and Network Synchronous Control Module (NSCM) 4) and operation and maintenance control module (not shown).

The low speed subscriber matching module (MSIM0: 10-0) of the subscriber switching subsystem includes a plurality of low speed subscriber matching boards (LUIA0 to LUIA8: 11-0 to 11-8) or one medium speed for connecting low speed subscribers. The subscriber matching board (MUIA) and the medium and low speed subscriber matching control board 12 for controlling the matching of the low and low speed subscriber, the subscriber switching module 20 and the local link block 21 for connecting to the subscriber side; It consists of a local link block 23 and a switching block 22 for connecting to the central switching subsystem side. The switching block 22 is composed of a switching memory board SMEA 221 and a switching memory control board SPTA 222 that controls the switching memory board 221 according to a command of the SCP.

The ALS configured as described above performs call service by detecting when a call request is generated from the subscriber, translates the incoming ALS using the called subscriber number under the control of the originating ALS, and then translates the number into the corresponding ALS. Require. The incoming ALS selects the best route at the same time as number translation and notifies the originating ALS, and the originating ALS sets up the call path accordingly.

The originating ALS counts the cells delivered during the call and sends the billing data to the ACS along with the user-required service type after completing the call. The originating ALS restores the call data to the idle state.

Subscriber call processing processor (SCP: 30) is a system based on the application software including the call processing on the processor and the OS is provided to provide a system-level service, the signal processing unit (SHP: Signaling Handler Part), call processing unit (CPP) It consists of: Call Process Part and Number Translation Part. The signal processing unit (SHP) performs the AAL and Layer 2 functions and informs the CPP of the Q.2931 for UNI and the B-ISUP signal for the NNI, and the call processing unit (CPP) signals for Q.2931 and B-ISUP. Performs processing and examines system resources to determine whether to accept a new call (connection admission control). The NTP performs a function of finding a physical output port corresponding to the called party number. The physical output port number is composed of an ALS number and an output link number. The called ALS number is an outgoing ALS. Incoming ALS is to be translated.

On the other hand, the switch structure of the ATM switch is a limited shared memory structure, which is flexible in dealing with the fluctuations in the input traffic compared to other switch structures, is easy to realize a broadcasting function, and has a memory sharing type that can easily solve a conflict at the output stage.

In the subscriber switch module, the switch memory board (SMEA) 221 receives an input through a local link board (LLIA), multiplexes it, stores it in a memory, translates the head of the received input cell, and performs routing to store the stored memory. It performs the function of sending data to the desired output port.

At this time, the structure of the data transferred between the exchanged links is an Inter-Module Interface (IMI) having a size of 64 octets. This IMI is a 53 octet ATM cell, a 3-octet routing head, and 8 for link maintenance. Consists of octets of data.

In addition, the switching memory control board (SPTA) 222 is implemented with a microprocessor, SRAM, DPRAM, etc. to perform a control function for the unit switch. First, the broadcast service is received when the broadcast call is received by receiving the broadcast path information from the broadcast control processor. It manages the state of the FIFO, memory, and input / output ports mounted in the SMEA 221, and reads the error information of the input cell detected by the SMEA and reports it to the maintenance processor. When the input cell exceeds / recovers the threshold by managing the priority control function, the over / recovery information is also reported to the maintenance processor.

Based on the understanding of the basic characteristics of the ATM exchange as described above will be described in the subscriber board mounting process of the present invention.

2 is a flowchart illustrating a method for mounting and dismounting a subscriber board according to the present invention. When an event in which a medium or low speed subscriber board of a physical layer is mounted or dismounted occurs, the process is performed according to the board type and the previous state of the board.

For example, if a hernia or mounted board is a medium-speed subscriber matching board, and the previous state of the board is mounted, the medium-speed subscriber matching board is reported to SCP as a hernia and treated as a hernia state. The hernia or mounted board is a medium-speed subscriber board. If the previous state of the board is hernia, the medium speed subscriber registration board is reported to SCP and treated as mounted state.

In addition, if the hernia or mounted board is a low-speed subscriber registration board, and if the previous state of the board is mounted, the low-subscription subscriber board is reported to SCP as a hernia and treated as a hernia state, and the hernia or mounted board is a low-speed subscriber board. If the previous state of the board is hernia, the SCP shall be reported to SCP that the low speed subscriber registration board is mounted and treated as mounted.

At this time, one medium-speed subscriber matching board is mounted in the low-speed subscriber matching module, but nine low-speed subscriber matching boards may be mounted from '0' to '8'. If it occurs, it is necessary to determine the board number.

Now, each step will be described in detail.

Initially, the medium speed subscriber registration board or the low speed subscriber registration board is in an idle state, waiting for a room / hernia event (step 100).

In the step 101 of receiving a hernia or mounting signal, the low-speed subscriber matching control board receives an event generated from a medium-speed subscriber matching device or a low-speed subscriber matching device that is physically connected thereto. That is, since the middle speed subscriber matching board and the low speed subscriber matching board (physical layer board) are physically connected to the low speed subscriber matching control board, the event is reported when the physical layer board is detached or mounted from the connector. .

Then, it is determined whether a predetermined timer for periodic testing of the board in which the event has occurred is registered (step 102), and if this timer is registered, the timer is stopped (step 103). That is, the periodic test function is stopped once for the board where the hernia or mounting event occurs.

Now, the board in which the event occurred is determined. In this step, the corresponding event is examined to determine whether the board in which the event occurs is a middle speed subscriber matching board (step 104).

As a result of the determination in the event occurrence board determining step (step 104), if the type of the board on which the event occurs is not a medium speed subscriber matching board, an event has occurred in the low speed subscriber matching board, and thus the number of the low speed subscriber matching board where the event has occurred is determined. (Step 105).

Then, it is determined whether the low-speed subscriber registration board of the determined number has been hernia (step 106). It is determined whether the previous state of the registration board was the mounted state (step 107).

As a result of the determination in step 107, if the previous state of the low speed subscriber matching board is in a mounted state, it means that the state has been changed from a mounted state to a hernia state. After setting the state of the low speed subscriber registration board to the hernia state to manage the hernia state (step 109), the process proceeds to step 100 again.

However, if the determination result in step 107 indicates that the low speed subscriber matching board was not mounted, the low speed subscriber matching board was changed from the hermetic state to the mounted state. After reporting (step 110), the low-speed subscriber matching board is set to be mounted and managed (step 111).

On the other hand, as a result of the determination in the event occurrence board determination step in step 104, if the type of the board is the middle speed subscriber matching board, it is determined whether the middle speed subscriber matching board is dismounted (step 112).

As a result of the determination in step 112, if the intermediate subscriber matching board is dismounted, it is determined whether the previous state of the intermediate subscriber matching board is mounted (step 113), and if the previous state of the intermediate subscriber matching board is mounted, the intermediate subscriber matching board is mounted. Since the state has changed from hernia to state, the middle speed subscriber matching board is reported to SCP (step 114), and the middle speed subscriber matching board is treated as hernia (step 115).

However, as a result of the determination in step 112, if the middle speed subscriber matching board is not herded, it is determined whether the previous state of the middle speed subscriber matching board is hernia (step 116).

As a result of the judgment in step 116, if the previous state of the medium speed subscriber matching board is hernia, the medium speed subscriber matching board is changed from the hermetic state to the mounted state, and thus, the SCP of the medium speed subscriber matching board is mounted (step 117), and the medium speed The subscriber registration board is processed in a mounted state (step 118).

Through these steps, it detects the hernia and mounting status of the physical layer boards (intermediate subscriber matching boards and low speed subscriber matching devices) of the ATM leased line subscriber matching device, and reports the facts to SCP managing the operation and maintenance functions. It is possible to manage subscriber links in hernia and mounted physical layer boards.

As described above, when the subscriber board is mounted or dismounted in the medium-low speed subscriber registration block, according to the present invention, the failure board is reported to the SCP so that appropriate measures can be taken, thereby effectively managing the subscriber link. have.

Claims (1)

An ATM switching apparatus for exchanging ATM cells by accessing a low speed subscriber, comprising: receiving a detach / mount signal generated from a predetermined medium speed subscriber matching board or a low speed subscriber matching board; Determining whether a predetermined timer for periodic testing of the board is registered and stopping the timer if it is registered; If the type of the board where the disconnect / mount signal is generated is MUIA and the previous status of the middle speed subscriber matching board is mounted, the status of the medium speed subscriber matching board is reported to the predetermined subscriber call processing processor (SCP). Treating with; Reporting to the SCP that the middle speed subscriber matching board is mounted if the type of the board on which the detach / mount signal is generated is a medium speed subscriber matching board and the previous state of the middle speed subscriber matching board is hernia, and processing the mounted state; Determining a board number of the low speed subscriber matching board if the type of the board on which the detach / mount signal is generated is a low speed subscriber matching board (LUIA); Reporting to the SCP that the low speed subscriber matching board is hernia if the previous state of the corresponding low speed subscriber matching board from which the number is determined is mounted, and then treating it with a hernia state; And reporting to the SCP that the low speed subscriber matching board is mounted if the previous state of the corresponding low speed subscriber matching board from which the number is determined is processed, and then processing the mounted state of the low speed subscriber matching board. How to handle hernias.