KR19990043395A - How to load a processor in ATM-PITI interworking system - Google Patents

Abstract

The present invention relates to a method for loading programs into processors of an ATM-PSTN InterWorking Subsystem (IWS) for connecting an analog telephone network (PSTN) subscriber to an ATM switching network in an ATM switch. .

In the method of the present invention, the system startup loader (SSLNF) performed in OMP is composed of a main process, a table setting process, a loading request processing process, and a loading process, and the loading request processing process is activated by the main process to receive a signal. Waiting for; Generating a loading table, a processor state management table, and a system loading state management table by the table setting process called by a main process; When the loading request processing process is requested to load, the loading process is activated by the loading request processing process to load the OS and the application program into the memory of the processor requesting the loading, and to load data values of the tables set by the table setting process. Making a change.

Therefore, by using the method according to the present invention, it is possible to implement a very compact loading program, thereby improving the readability of the loading program and to facilitate debugging.

Description

Method of loading programs to pheripheral processors in ATM-PSTN IWS

The present invention relates to a method for loading programs into processors of an ATM-PSTN InterWorking Subsystem (IWS) for connecting an analog telephone network (PSTN) subscriber to an ATM switching network in an ATM switch. .

With the rapid development of the information society, users' communication service demands have increased, and the "B-ISDN" has emerged as the next-generation communication network.B-ISDN can accommodate not only narrow band but also various services of broadband regardless of band and speed. The ATM method, which is an asynchronous delivery mode, is used as a basic means of delivery.

In view of the evolution of the network, various technologies are being studied to accommodate the existing STM-based networks in the ATM network because it is difficult to change the ATM network without accommodating the PSTN network or the narrow-band ISDN that are currently used. .

As such, the ATM-PSTN interworking system (IWS) is required to access the PSTN network to the ATM network, and a new loading method is required to load an operation program into the processor of the interworking system. That is, the loading method used in the conventional electronic exchanger was loaded with a program of a lower processor by P-BOOTER and OMPSL (ie, SSL: System Startup Loader), as disclosed in Korean Patent Publication No. 94-453. Such loading in SSL includes various functions such as individual loading and group loading. Accordingly, the loading program has a large size, which makes it difficult to debug and decreases readability. However, the loading function required by IWS is relatively simple, the software to be loaded is different, and in particular, the signal system is different, so IWS requires a new loading method.

Accordingly, an object of the present invention is to provide a new method for loading an operating system and an application program in an ATM-PSTN interworking system in order to satisfy the above needs.

In order to achieve the above object, in the method of the present invention, a PSTN-ATM interworking system for connecting a subscriber of a PSTN network to an ATM switching network includes a peripheral processor (PP) and an interworking processor (IWP), and the peripheral processor (PP). Or a system startup loader (SSLNF) performed by the OMP in a method of loading an operating system (OS), an application program, or the like into a memory of an interworking processor (IWP) through an operation and maintenance processor (OMP) of an ATM switching network. Is a main process, a table setting process, a loading request processing process, and a loading process, wherein the loading request processing process is activated by the main process to wait for signal reception; Generating a loading table, a processor state management table, and a system loading state management table by the table setting process called by the main process; When the loading request processing process is requested to load, the loading process is activated by the loading request processing process to load the OS and the application program into the memory of the processor requesting the loading, and the data values of the tables set by the table setting process. It characterized in that it comprises a step of changing.

1 is an example of an ATM switching system to which the present invention is applied;

2 is a diagram illustrating a relationship between programs located in each processor according to the present invention;

3 is a functional block diagram of a system loading function module (SSLNF) according to the present invention;

4 is a flowchart illustrating a procedure performed by a table setting process according to the present invention;

5 is a flowchart illustrating a procedure performed by a loading request processing process according to the present invention;

6 is a flowchart illustrating a procedure performed by a loading process according to the present invention.

* Explanation of symbols for main parts of the drawings

110: ALS-trunk 120: ALS-subscriber

130: interworking system (IWS) 140: PSTN

150: central switching subsystem 160: workstation

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

The ATM switch to which the present invention is applied, as shown in FIG. 1, includes a local switching subsystem (ALS-trunk), a local switching subsystem (ALS-member), and an ATM local switching-subscriber subsystem. 120), interworking system (IWS: 130), central switching subsystem (ACS: ATM), workstation (W / S: 160), hard disk (H / D: 170), etc. .

Although not shown in the figure, the ATM local switching subsystem (ALS) -trunk 110 includes as many trunk interface modules (TIMs) as the number of trunks and an access switching network module (ASNM) that accommodates them, It consists of a Call & Connection Control Processor (CCCP) that controls the subsystem to provide NNI connectivity at the STM-1 or STM-4 level. It handles outgoing and incoming calls to other ATM exchanges and is connected to the ATM Central Switching Subsystem (ACS) and the IMI. Here, IMI is a typical link of about 155M connecting between the local switching subsystem and the central switching subsystem.

ATM Local Switching Subsystem (ALS) -subscriber 120, although not shown in the figure, is a Subscriber Interface Module (SIM) as many as a subscriber link, and an Access Switching Network Module (ASNM) to accommodate this SIM. Call and Connection Control Processor (CCCP), which controls the subsystem, provides UNI for connecting subscribers of STM-1, DS1E / DS3 level, and IMI with central switching subsystem. Is connected to. Typically, multiple ALS-subscribers and ALS-trunks are installed according to their total capacity and connected to one central switching subsystem.

The ACS 150 is composed of an Interconnection Switch Network Module (ISNM) and an Operational Preservation Processor (OMP: 152) to provide a switching function for the IMI connected to the local switching subsystem. And maintenance related functions.

The interworking system 130 is for connecting analog subscribers of the PSTN network to the ATM switching network, and includes a processor (PP: 134) for controlling the connection with the PSTN and a processor (IWP: 132) for controlling the interworking system. . The interworking system 130 is then connected to the ATM switching network through the ALS-subscriber subsystem 120.

The workstation 160 connected to the OMP 152 and the Ethernet provides an HMI function between the operator and the exchanger, transfers the MMC input by the operator to the exchanger, and displays the result, and the hard disk 170 It is also connected to peripherals such as).

Various operating systems and applications are loaded to operate the system at the initial operation of the ATM switch. According to the present invention, as shown in FIG. 2, an NMP (System Startup Loader Narrowband) is used in the OMP 152. Function) is operated, IWOS and IWINF are loaded into the IWP 132 by this SSLNF, and PPOS, PPSDNF, and an application are loaded into the PP 134.

2, SSLNF is active in OMP 152 while ACS is operating normally. In this case, when the interworking system is operated, the IWP-BOOTER is first activated in the IWP 132 of the interworking system, and then a loading request signal is transmitted to the SSLNF in the OMP to request iwp loading. Accordingly, SSLNF reads a program stored in a specific block of the hard disk and loads IWOS and IWINF into IWP's memory through IPC. Then, if IWINF (a kind of PP-BOOTER function) requires pp loading to SSLNF, SSLNF Reads a program stored in a specific block of the hard disk, and loads the PPOS, PPSDNF, and application programs in the memory of the PP 134.

As described above, the loading procedure performed by SSLNF is as follows.

3 is a functional block diagram of SSLNF performing loading according to the present invention, SSLNF 300 is the main process (SSLNF_main: 310), the loading request processing process (SSLNF_sros_rx_req: 320), the loading process (SSLNF_ppos_ld: 330), table It consists of a setting process (table setting: 340) to load the operating system and applications in accordance with the loading request of the PP-booter (350). At this time, looking at the relationship of each process, the main process 310 is first performed and activated, then the table setting process 340 is activated by a call to generate a variety of tables related to loading, loading request processing process 320 ) Is activated by the start of the main process, and the loading process 330 is started by the loading request processing process 320 when there is a loading request from the PP-booter 350. The loading request processing process 320 and the loading process 330 perform various processes using the table generated by the table setting process 340.

4 is a flowchart illustrating a procedure handled by a table setting process. Referring to FIG. 4, the table setting process initializes the block table, generates a loading table, generates a processor state management table, and then generates a system loading state management table (401, 402, 403, 404).

Here, the data structure of the system loading state management table is defined in a programming language as shown in Table 1 below.

slsmt_m = struct (iaddr INT, / * ipc address * / blno INT, / * block number * / ld_time INT, / * loading time * / ld_size INT, / * loading size * / pr_ind INT, / * processor indication * / blsts BYTE, / * block status * / exist M_EQP_MODE); slsmt ARRAY (1: PRSMT_MAX) ARRAY (1: 128) ARRAY (1: 3) slsmt_m

The system loading state management table shown in Table 1 exists one for each PP. Each block loaded in the PP has information having a structure of slsmt_m, and one PP includes ppos or iwos, an application block, and a PPSDNF. Since the slsmt_m format information has three columns in two dimensions.

An example of the processor state management table is defined by a programming language as shown in Table 2 below.

prsmt_m = struct (prname CHAR (8), / * processor name * / lgno INT, / * pp logical address * / iaddr INT, / * ipc address * / side INT, / * side0: A side1: B side2: single * /....prsts BYTE, / * processor status * / .... prtype pptype_m / * processor type * /);

As shown in Table 2, the processor state management table has information on a processor name, a processor state, an IPC address, and the like.

FIG. 5 is a flowchart illustrating a procedure performed by a loading request processing process for processing a loading request from a PP. Referring to FIG. 5, after the loading request process is activated by the main process, it is present as a permanent process and waits for a signal (signal) to be received. In this case, when a signal is received, an appropriate processing procedure is performed according to the signal (501).

For example, when a load request signal is received from the P-booter of the PP, the processor state management table of the corresponding PP is checked. If the processor is normal, the loading processor wakes up the loading processor to perform the loading process. (502, 503, 504).

When the processor status signal is received in the signal reception standby state, the processor state management table is set to data accompanying the received signal, and then waits for signal reception again (505,506), and when a loading error signal is received, a loading error message is generated ( 507,508). When the OS loading completion signal is received from the PP in the signal reception standby state, the OS loading completion signal is transmitted to the loading process. When the application loading completion signal is received from the PP, the application loading completion signal is transmitted to the loading process (509, 510, 511, 512).

6 is a flowchart of a loading process that is started by the loading request processing process and actually handles the loading. Referring to FIG. 6, the state of the PP to be loaded after being activated by the load request processing process is checked (601). If the check result is normal, the processor state management table of the PP to be loaded is checked and then the OS is loaded. (602, 603).

When the OS loading is completed, the OS loading completion signal is generated, and the OS loading response timer is started (604, 605). Subsequently, upon waiting for signal reception and receiving an OS loading completion signal from the PP through a loading request processing process, OS loading completion is set in the system loading state management table of the corresponding PP (606, 607, 608). If the OS loading response timer is terminated during signal reception and receives the OS loading response timer end signal, it is determined whether the loading is completed. If the loading is not completed, an OS loading failure signal is generated. Load PPSDNF or IWPINF (609,610,611,612,613). Subsequently, when the application loading is completed, after the application loading completion signal is generated, the application loading response timer is started and waits for signal reception (614,615,616).

When the application loading completion signal is received while waiting for signal reception, the loading completion is set in the processor status management table and the system loading status management table of the corresponding PP. The loading is completed when the application loading response timer is terminated and the timer end signal is received during the signal reception wait. If it is determined that the loading is completed, the process is terminated. If the loading is not completed, an application loading failure signal is generated (617, 618, 619, 620, 621).

As described above, according to the present invention, when the SSNF operating in the OMP of the ATM exchanger receives the loading request signal from the IWP or the PP of the IWS in the interworking system (IWS) for accessing the PSTN network to the ATM network, the OS and the application accordingly You can load the program. In particular, by using the method according to the present invention, it is possible to implement a very compact loading program, thereby improving the readability of the loading program and to facilitate debugging.

Claims (3)

The PSTN-ATM interworking system for connecting subscribers of the PSTN network to the ATM switching network includes a peripheral processor (PP) and an interworking processor (IWP), and the memory of the peripheral processor (PP) or the interworking processor (IWP) is connected to the ATM switching network. In the method of loading the operating system (OS), applications, etc. through the operation and maintenance processor (OMP), The system startup loader (SSLNF) performed in the OMP is composed of a main process, a table setting process, a loading request processing process, a loading process, Activating the loading request processing process by the main process to wait for signal reception; Generating a loading table, a processor state management table, and a system loading state management table by the table setting process called by the main process; When the loading request processing process is requested to load, the loading process is activated by the loading request processing process to load the OS and the application program into the memory of the processor requesting the loading, and the data values of the tables set by the table setting process. The processor loading method in the AMT-PI styrene interworking system comprising the step of changing. The process of claim 1, wherein said loading request processing process is Checking the processor state management table of the processor when receiving the loading request signal while waiting for signal reception; activating the loading process if the table is normal; and receiving the processor state signal while waiting for signal reception. Setting the management table to the corresponding data; and when the OS loading completion signal is received from the processor of the interlocking system, transferring it to the loading process, and when the application loading completion signal is received from the processor of the interlocking system, transferring it to the loading process. Processor loading method in the AMT-PS. The process of claim 1 wherein the loading process is Checking the processor and the processor state management table requesting the loading, loading the OS if the check result is normal, waiting for the loading completion response from the processor when the OS loading is completed, and loading completion response from the processor Receiving or if the response time timer is finished loading the application, etc., loading the application, waiting for the loading completion response from the processor when the application is completed, the loading completion response is received from the processor or the response time timer is terminated If the loading is complete, the processor sets the state management tables of the processor to the loading completion, and generates a loading failure signal if the loading is not completed even if the timer expires. Loading method.