KR0175737B1 - Asynchronous distributed switching system - Google Patents

Abstract

The present invention relates to an asynchronous decentralized switching system. The asynchronous decentralized exchange in which a management scheme based on a telecommunication management network standard is introduced for the purpose of integrating and providing various services required in the information age using an ATM method. It's about the system.

The present invention overcomes the shortcomings of the existing network and initiates the initial ATM acceptance and initial activation of the broadband integrated information network (B-ISDN). The basic ATM is based on the existing Plesiosynchronous Digital Hierarchy (PDH) transmission line. Synchronous Digital Hierarchy (hereinafter referred to as SDH) enables the acceptance of transmission lines and narrowband bandwidth to existing frame relay networks by utilizing the per-cell transmission capability of ATM networks and the ability to establish multiple virtual connections. It is to provide a DSIE (2.048Mbps) ATM matching function for interconnecting an N-ISDN and a switching system capable of performing a distributed exchange function for mutual communication between ATM users.

In order to achieve the above object, the present invention provides a connection between a plurality of RSNs and RSNs that are in charge of a subscriber and an ATM switch or another HSN, and a single HSN that transfers control and management of an EMS to an RSN. In order to control and manage these distributed exchange nodes, we developed an asynchronous distributed exchange system consisting of a single EMS based on TMN.

RSN has various interfaces of DS1E, DS3, and STM-1, and interwork with ATM terminal, frame relay network, and N-ISDN for local switching or forwarding to HSN through multiplexing and demultiplexing of traffic. It handles all the matters related to subscribers.

The HSN is responsible for providing connectivity between three RSNs, connecting to other HSNs or ATM switches, and transferring control and management from EMS to RSNs over ATM connections. Designed based on TMN, EMS is connected to HSN and Ethernet, and RSN is connected to RSN by ATM connection through HSN to control and manage switching nodes.

The present invention multiplexes traffic of DS1E, DS3, STM-1 ATM terminal, DSIE frame relay, DS1E N-ISDN to STM-1, and implements cell switching module which performs cell switching function to transfer locally or transfer to HSN. In this case, HSN performs the distributed exchange function by passing it to another RSN or another HSN or ATM switch. In addition, by developing an TMN-based EMS, it is possible to manage and control integrated networks such as performance monitoring and fault detection for assemblies mounted remotely with all subscribers. In addition, in order to secure the reliability and stability of the system, the main assembly has a 1 + 1 redundancy structure, and it is a switching system having a flexible structure that enables the mounting of the subscriber connection assembly according to the environment of the subscriber where it is installed.

Description

Asynchronous distributed exchange system

1 is a block diagram of an asynchronous distributed exchange system according to the present invention.

2 is a functional diagram of a hub switching node (HSN) of an asynchronous distributed switching system.

3 is a front view of the HSN.

4 is a functional diagram of a Remote Switching Node (RSN) of an asynchronous distributed switching system.

5 is a front mounting diagram of the RSN.

6 is a basic management diagram of an asynchronous distributed exchange system.

7 is a basic structure diagram of an element management system (EMS).

8 shows a protocol of an EMS.

9 illustrates a protocol between an administrator and an agent.

10 is a diagram illustrating a protocol between EMSs.

11 is a configuration diagram of a power supply unit of an exchange node.

12 is a schematic diagram of a power supply.

FIG. 13 illustrates a connection scenario for providing an equal bit rate (CBR) service in FIG.

14 shows a connection scenario for providing a connected data service (CMBS) in FIG.

FIG. 15 is a diagram illustrating a connection scenario with a frame relay network in FIG.

FIG. 16 is a diagram illustrating a connection scenario between FIG. 1 and a narrowband communication network (N-ISDN).

* Explanation of symbols for main parts of the drawings

210: node control module 211: node management assembly

212: Clock Distribution Assembly 213: Hard Disk Driver

220: other exchanger connection module 221: other exchanger connection assembly

230: power supply module 240: cell replacement module

241 cell exchange assembly 250 node-to-node connection module

251: Node-to-node connection assembly 260: Distributed management device basic management system

410: node control module 411: node control module

420: cell exchange module 421: cell exchange assembly

430: node-to-node connection module 431: node-to-node connection assembly

440: subscriber access module 441: STM-1 subscriber access assembly

442: DS3 Subscriber Access Assembly 443: DS3 Multiplexing Assembly

444: DS1 subscriber access assembly 445: DS1 multiplexing assembly

446 DS1 frame relay connection assembly

447 DS1 line emulation connection assembly

450: power module

ATM-MSS: (Asynchronous Transfer Mode MAN (Metropolitan Area Network Switching System) Asynchronous Decentralized Switching System

NCM: (Node Control Module) Node Control Module

NMA: (Node Management Assembly) Node Management Assembly

CDA: (Clock Distribution Assembly) Clock Distribution Assembly

CSM: (Cell Switching Module) Cell Switching Module

CSA: (Cell Switching Assembly) Cell Exchange Assembly

AAL: (ATM Adaption Layer) ATM Adaptation Layer

HDD: (Hard Disk Driver) Hard Disk Driver

SIM: (Subscriber Interface Module) Subscriber Access Module

STM-1: (Synchronous Transfer Mode Level 1) Synchronous Transfer Mode 1

SAS1: (Subscriber Interface Assembly STM-1) STM-1 Subscriber Assembly

SAD3: (Subscriber Interface Assembly DS3) DS3 Subscriber Access Assembly

D3MA: (DS3 Multiplxing Assembly) DS3 Multiplexing Assembly

SAE1: (Subscriber Interface Assembly DS1E) DS1E Subscriber Access Assembly

D1MA: (DS1E Multiplexing Assembly) DS1E Multiplexing Assembly

FRIA: (Frame Relay Interface Assembly) DS1E Frame Relay Connection Assembly

CAE1: (Circuit Emulation Interface DS1E) DS1E Circuit Emulation Connection Assembly

NIM: Node Interface Module

NIA: Node Interface Assembly

EIM: (Exchange Interface Module) Other Exchange Connection Module

EIA: (Exchange Interface Assembly) Other Exchange Connection Assembly

PWN: (Power Module) Power Module

PDU6L: (Power Distribution Unit 6U Left) Left 6U Power Distribution Unit

PDU6R: (Power Distribution Unit 6U Right) Right 6U Power Distribution Unit

PDU9L: (Power Distribution Unit 9U Left) Left 9U Power Distribution Unit

PDU9R: (Power Distribution Unit 9U Right) Right 9U Power Distribution Unit

The present invention relates to an asynchronous distributed switching system, and more particularly, a telecommunications management network for the purpose of integrating various services required in the information age using an asynchronoushorn transfer mode (hereinafter referred to as ATM). The present invention relates to an asynchronous distributed switching system in which a management scheme according to the Telecommunication Management Network standard is introduced.

Recently, various kinds of networks have been constructed or are being constructed according to the rapid development of technology and various services, and the continuous construction of networks using these different protocols is a complex interworking function for interworking between networks. It is not economical as it requires), and much time and investment are required for the separate network construction and maintenance and management of different networks.

ATM, which is a transmission method that has both characteristics of circuit switching and packet switching, is emerging as a technique that can overcome the complex management techniques for interworking and interworking these heterogeneous systems and flexibly cope with new service acceptance. . In other words, ATM combines the advantages of low overhead and processing load, low transmission delay of information using the connection, and the flexibility of bit rate allocation for packet switched connections. Therefore, the advantage of ATM network as a transmission method is that the flexibility of service that can provide any required service, the stability of the future, and the management of resources in the network can be managed by using management techniques. It is high and it is economical because it is possible to provide all the services in one network construction and does not need separate network construction. Therefore, it is possible to provide a variety of services through a unified access standard, ATM communication network using ATM that can be flexibly evolved to provide new service is widely recognized as the next generation public and private communication network, technology development using ATM Is active worldwide.

Therefore, the present invention overcomes the disadvantages of the existing network and initiates an existing synchronous digital hierarchy (PDH) transmission line for initial activation of ATM acceptance and initial activation of a broadband integrated information network (B-ISDN). ATM basic connection and Synchronous Digital Hierarchy (hereinafter referred to as SDH) allow the acceptance of transmission lines, and use existing frame relay network by using cell-to-cell transmission capability and multiple virtual connection establishment capability of ATM communication network. This paper provides a DSIE (2.048Mbps) ATM matching function for interconnecting the N-ISDN and a decentralized exchange function for communicating between ATM users.

In order to achieve the above object, the present invention provides a connection between a plurality of RSNs and RSNs that are in charge of a subscriber and an ATM switch or another HSN, and a single HSN that transfers control and management of an EMS to an RSN. In order to control and manage these distributed exchange nodes, we developed an asynchronous distributed exchange system composed of a TMN based element management system (hereinafter referred to as EMS).

RSN has various interfaces of DS1E, DS3, and STM-1, and interwork with ATM terminal, frame relay network, and N-ISDN for local switching or forwarding to HSN through multiplexing and demultiplexing of traffic. It handles all the matters related to subscribers.

The HSN is responsible for providing connectivity between three RSNs, connecting to other HSNs or ATM switches, and transferring control and management from EMS to RSNs over ATM connections. Designed based on TMN, EMS is connected to HSN and Ethernet, and RSN is connected to RSN by ATM connection through HSN to control and manage switching nodes.

The above and other objects, features, and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows the types of devices that can be connected to the asynchronous distributed exchange system and the configuration diagram of the asynchronous distributed exchange system. As mentioned above, RSN functions to receive traffic through matching and interworking from subscribers with various interfaces to perform local exchange or transfer to HSN and, conversely, to transfer traffic from HSN to subscribers. do. Subscriber terminals that can be connected to RSN include DS1E with PDH interface, STM-1 ATM terminal with SDH interface and STM-1 ATM terminal with SDH interface, and LAN-MSAD (MAN (Metropolitan Area Network) for connection between LAN and ATM network using Ethenet. ) Subscriber Access Device (Broadband Local Network Subscriber Access Device), CBR (Constant Bit Rate) for processing constant bit rate data -MSAD, FR (Frame Relay) to connect Frame Relay terminal and ATM network MSAD, N-ISDN terminal, E1 terminal, E1 frame relay terminal and so on. The protocol for providing such a service includes a protocol and a connection scenario for providing an equal bit rate service in FIG. 13, a protocol and a connection scenario for providing a connected data service in FIG. 14, and a frame relay network in FIG. In Fig. 16, the connection scenario and the protocol of the N-ISDN network are shown. The HSN receives the traffic input from the RSN and transfers it to another RSN or another exchange, and conversely, the HSN transfers the traffic input from the other exchange to the RSN.

2 shows the functional configuration of the HSN, and FIG. 3 shows the front mounting diagram of the HSN. HSN's node racks can have one control shelf at the bottom and four STM-1 shelves above them, with cooling fans mounted at the top and bottom to prevent damage to the system from overheating. The front and rear of the rack are equipped with doors to prevent physical damage to the system and to facilitate management. Wheels are installed at the bottom to move the rack. Functionally, the HSN is composed of a node control module 210, another switch connection module 220, a power supply module 230, a cell switching module 240, and an inter-node connection module 250.

The node control module 210 is composed of a node management assembly 211, a clock distribution assembly 212, and a redundant HDD 213.

The node management assembly 211 controls the operation and management of the node, that is, the operation of the node, reports the situation of the node and the data generated in the node to the EMS 260, and performs the instructions of the EMS 260. Perform control and management of the entire system. In addition, it performs air agent functions such as performance, failure, configuration, and connection management, which are management functions defined by TMN, and serves as a connection path between the node management assembly of the RSN and the EMS 260. Represents all resources in the node in the form of a managed object (MO) for management of each assembly in the HSN by the command of the manager EMS 260, performs operations for each MO, and provides notification from the MO. Process and report to EMS 260. The communication with the EMS 260 is performed by sending and receiving a Common Management Information Protocol (hereinafter referred to as CMIP) message through Ethernet, so it is referred to as CMIP and Common Management Information Service (CMIS). It has agent function and has OSI 7 layer and CMIP / CMIS protocol layer. Since each assembly is made of an ATM connection, commands and reports are exchanged through the cell exchange module 240 and the AAL5 protocol is used. In addition, the standby device and the operating device always maintain the same operation status and management information, but the standby device has a 1 + 1 non-reversible bidirectional protection switching function that does not send a cell or signal to another assembly to improve the stability of the system. Ablation is performed automatically when instructed by EMS or when certain conditions are met. The node management assembly can also manage the switching behavior of other redundant assemblies in the node.

The clock distribution assembly 212 receives a 155.52 Mbps receive dependent signal from a DS1E clock and another switch connection module having no frame format from a digital office timing supply (DOTS) as a network synchronization reference signal. It provides the clock and network synchronization clock needed by each assembly in the node based on the network synchronization signal. If a failure occurs in the DOTS clock signal, the receive dependent signal is used as the network synchronization reference clock. If both reference clocks fail, the signal is operated in holdover mode. In addition, as with the node management assembly, the standby device has a 1 + 1 non-recursive bidirectional switching function that does not send a clock or signal to other assemblies in the node, and the switching is automatic when directed by the node management assembly or when certain switching conditions are met. To do it.

The hard disk drive (HDD) 213 is connected to a node management assembly and a small computer system interface (SCSI) type 2 interface, and includes a management information model, a module operation program, and statistical data in a node system. It serves to store various information necessary for the operation and management of the node system, and all switching operations are instructed by the node management assembly 211 and have a redundant structure. That is, the two HDDs 213 always have the same data and are implemented so as not to affect the HDD 213 even when the node management assembly 211 is switched.

Cell exchange module 240 is comprised of one or more cell exchange assemblies 241. It receives a cell from each assembly in the node of the HSN and delivers it to the target assembly based on the routing field in the header of the cell. To support point-to-multipoint connections, you can copy cells as indicated in the cell header. To do this, copy one cell to all output ports. In addition, a buffer is placed in the module to prevent temporary congestion and to minimize congestion, thereby ensuring transmission delay priority according to the quality of service of each connection and loss priority according to the Cell Loss Priority (CLP) bit.

Internode connection module 250 is composed of one or more internode connection assemblies 251. The node-to-node connection assembly 251 connects the HSN and the RSN through the STM-1 link, and performs the physical layer related functions, the ATM layer related functions, and the traffic related functions according to the 1TU-T recommendation. Features related to the physical layer include the generation and termination of 155.52 Mbps signals, generation and termination of STM-1 frames, cell matching, extraction and reporting of performance-related coefficients in the physical layer, and detection, recovery, generation, and release of physical layer fault conditions. Physical layer fault management functions such as logging and reporting. Functions associated with the ATM layer include cell multiplexing and demultiplexing, cell generation and termination, and creation and removal of unassigned and idle cells, cell header translation, performance monitoring for connections directed by node management assembly 211, and connectivity checking. For example, it can perform a loopback, report the result, and generate and transmit an alarm cell and a maintenance cell for a specific connection failure condition. Traffic related functions include a function of extracting and reporting a traffic parameter of a link or a connection. In addition, the standby device and the operating device always maintain the same operating state and traffic, but the standby device has a 1 + 1 non-recursive bidirectional switchover function that cannot send cells or signals to other assemblies in the node, and the switchover is a node management assembly. Follow the instructions of or perform it automatically when certain conditions are met. Unlike other redundant assemblies, the inter-node connection assembly 211 performs a switchover according to a transfer scenario using K1 and K2 bytes, which are overhead bytes of the STM-1 frame, when the relative assembly is transferred.

The other exchanger connection module 220 consists of one or more other exchanger connection assemblies 221. The other switch assembly connects the asynchronous distributed switch system with the other switch through one STM-1 link, and the physical layer related functions, ATM layer related functions, etc. according to the 1TU-T recommendation performed by the inter-node connection assembly. Perform traffic related functions. Redundancy ensures that waiting and running devices always maintain the same operating state and traffic. However, the waiting device is implemented with 1 + 1 non-recursive bidirectional switching, which cannot send a cell or signal to another assembly in the node, and transfers automatically when the node management assembly 211 performs a switching or when a certain condition is reached. Perform However, unlike the node-to-node connection assembly 211, switching using K1 and K2 bytes is not used.

The power module 230 is a device for supplying high-quality DC power to the HSN, which is composed of a power supply unit and a power distribution unit. A failure occurring in the power module 230 is provided to the node management assembly 211. Designed to be reported up to EMS (260). The power supply unit has a front view in FIG. 11 and a functional configuration in FIG. This unit operates by high frequency conversion method and controls the rectifier and rectifier using five -48V / 12A rectifier modules in parallel, alarming function such as abnormal status detection, operation status display, set value change function and alarm sending function. It is composed of a control panel consisting of a digital voltmeter, a digital ammeter, a switch, an indicator light, an LCD window, a key button for operation, and a storage battery that can operate for up to 3 hours in case of an abnormal input AC current. The power distribution unit receives -48V of DC power from the power supply unit and is mounted on each side of each shelf of the system rack to distribute the power required in each assembly, and has four different shapes. Normally, power is supplied by two pairs of power distribution units each 50%, and if one of the two power distribution units fails, the other power distribution unit that does not fail supplies all the power needed by the shelf. Reported to node management assembly 211.

4 and 5 show a functional diagram and a front mounting diagram of the RSN. The RSN receives the traffic input from the subscriber and performs a local exchange function or forwards it to the HSN and vice versa to perform the function of forwarding the traffic input from the HSN to the subscriber. Node-to-node connection module 430, subscriber access module 440, power module 450 and the like. The node rack of RSN has the same structure as the node rack of HSN.

The node control module 410 of the RSN has the same configuration and function as the node control module of the HSN. That is, all functions are identical to those of the node control module 210 of the HSN, except that the node management assembly 411 of the RSN is directly connected to the node management assembly 211 of the HSN through an ATM connection instead of directly connected to the EMS. Do this.

The cell exchange module 420 performs the same function as the cell exchange module 240 of the HSN.

The operation of the node-to-node connection module 430 is also the same as that of the node-to-node connection module 220 of the HSN, and only the mounting position is different. That is, the internode connection module 430 of the RSN is mounted in the hybrid shelf, and the internode connection module 220 of the HSN is mounted in the STM-1 shelf. Regardless of the mounting location, the functionality is the same.

Subscriber access module 440 includes STM-1 subscriber access assembly 441, DS3 subscriber access assembly 442, DS3 multiplexing assembly 443, DS1E subscriber access assembly 444, DS1E multiplexing assembly 445, frame relay connection. Assembly 446, a circuit emulation connection assembly 447.

The DS1E subscriber access assembly 444 connects with a DS1E MSAD or DS1E ATM subscriber through four DS1E links. Traffic received from four MSAD or ATM subscribers is transmitted to the DS1E multiplexing assembly 445, and traffic received from the DS1E multiplexing assembly 445 is demultiplexed and transmitted to the corresponding link based on the routing field of the header. In addition, the physical layer-related functions, ATM layer-related functions, and traffic-related functions according to the 1TU-T recommendation are performed. The physical layer-related functions include generation and termination of 2.048Mpbs signals, generation and termination of CRC multi-frames, cell matching, Physical layer failure management functions such as extraction and reporting of physical layer performance related coefficients, recording and reporting on physical layer failure status detection, recovery, occurrence, and release. Functions related to the ATM layer include cell multiplexing and demultiplexing, cell generation and termination and creation and removal of unassigned and idle cells, cell header translation, performance monitoring for connections directed by node management assembly 411, and connectivity checking. It performs the function of performing loopback, reporting the result and generating and transmitting alarm cell and maintenance cell in case of failure of a specific connection. Traffic-related functions perform the function of extracting and reporting the traffic parameters of the link or connection.

The DS1E multiplexing assembly 445 multiplexes the cells received from the 16 DS1E subscriber access assemblies 444 and transmits them to the cell switching assembly 421, and transmits the cells received from the cell switching assembly 421 to the routing field of the cell header. The function of transmitting to the DS1E connection assembly 444 as a basis. Cells received from the cell switching assembly 421 must perform cell copy as indicated in the header, and one cell copies and transmits to all connected connection assemblies. In addition, the standby device and the operating device always maintain the same operating state and traffic, but the standby device has a 1 + 1 non-recursive bidirectional switching function that cannot send a cell or signal to another assembly in the node. Transfer is performed according to the instruction of) or, if certain conditions are met, the transfer is automatically performed.

The DS3 subscriber connection assembly 442 connects with a DS3 ATM subscriber through three DS3 links. The traffic received from the three ATM subscribers is transmitted to the DS3 multiplexing assembly 443, and the traffic received from the DS3 multiplexing assembly 443 is demultiplexed and transmitted to the corresponding link based on the routing field of the header. The DS3 multiplexing assembly 443 performs physical layer related functions, ATM layer related functions, traffic related functions, and the like. Performance management, such as termination and generation of 44.736 Mbps line signals, termination and generation of Physical Layer Convergence Protocol (PLCP) frames, cell matching, extraction and reporting of performance coefficients in the physical layer, detection of failure conditions in the physical layer, and It performs physical layer related management functions such as recovery and the management of failures to make and report on the occurrence and release of failures. In addition, the ATM layer-related functions include cell multiplexing and demultiplexing, cell generation and termination and generation and removal of unassigned and idle cells, cell header translation, performance monitoring for connections directed by node management assembly 411, and connectivity. It performs checks, loopbacks, reports the results, and creates and transmits alarm cells and maintenance cells for specific connection failures. Traffic-related functions perform the function of extracting and reporting the traffic parameters of the link or connection.

The DS1E or DS3 subscriber access assembly (444,442) is multiplexed at the cell level but without terminating the ATM header, DS1E is multiplexed to 64 x DS1E, and DS3 is multiplexed to 3 x DS3 and entered into a single 155Mbps switching port.

The DS3 multiplexing assembly 443 receives the cell from the DS3 subscriber access assembly 442 and sends it to the cell switch assembly 421, and sends the cell received from the cell switch assembly 421 to the DS3 subscriber access assembly 442. . Cells must perform cell copy as indicated in the header, and one cell copies to all connected connection assemblies. There is no redundancy.

The frame relay connection assembly 446 is in charge of interworking with an existing frame relay communication network and an asynchronous distributed switching system, and has four DS1E links per assembly. In addition to the functions performed by the DS1E subscriber access assembly 444, an AAL related function is additionally performed for matching with the frame relay network. AAL-related functions are AAL type 5 functions, which enable the transparent transfer of common part convergence sublayer-signal data unit (CPCS-SDU), error detection and processing, and congestion information and loss priority information. It performs extraction and generation of frame relay frames, congestion control, and protocol mapping. It also manages and reports the AAL's performance functions, maintains status information, FR matching, management for Permanent Virtual Circuit (PVC) services, and connection management.

The circuit emulation assembly 446 provides an interworking function for providing DS1E circuit emulation function, and has four DS1E links each of transmission and reception per assembly, in addition to the functions performed by the DS1E subscriber access assembly 444, Perform AAL related function for matching. AAL-related functions are AAL type 1 functions, such as subscriber number and cell synchronous interface (CSI) generation and extraction functions, and segmentation and reassembly using the same; Segmentation And Resegmentation-Protocol Data Unit; Generate SAR-PDU, Cyclic Redundancy Check (CRC) and Parity Check, Synchronous Residual Time Stamp (SRTS) Generation, Clock Recovery Using SRTS, Cell Delay Change (Cell) It performs Delay Variation (CDV) processing function, transfers the reception bit clock of the physical layer to the AAL, and performs serial / parallel conversion of data. It also manages and reports the AAL's performance and maintains status information.

The power supply module 450 performs the same function as the power supply module of the HSN and has the same structure.

6 shows a management structure of an asynchronous distributed exchange system. The network management structure of the asynchronous distributed switching system is a network management structure for providing communication between communication networks and services and management functions for communication networks and services using manager and agent relationships. ITU-T SG IV is currently promoting standardization work. It follows the TMN structure. First of all, each node of HSN and RSN supports the interface defined by TMN as a network element function, and abstracts the software and hardware resources necessary for the actual network configuration. EMS, which performs each management function of the asynchronous distributed switching system, communicates with the agent function of each node using CMIP, a network management protocol. Each network element of the asynchronous distributed exchange system supports the support of the asynchronous distributed exchange system MO, the automatic detection of the internal elements of the network element, the support of the management protocol, the performance monitoring and reporting of the internal function of the network element, the fault detection and It has a reporting function, storage and reporting function of network element usage data.

7 shows the basic structure of the EMS. As shown in the figure, the management function in EMS consists of three parts: resource management system, management service environment, and user service environment. The resource management system includes configuration, failure, performance, complement, accounting, and connection management functions at the distributed system level and at the node level. However, unlike the other management functions, the connection management function has to provide a real time service. User service environment and management service environment are defined as functions to connect network resource management function with real users and operators. The user service environment has management functions for call level communication sessions. These functions are performed by requests from users to make decisions on service and required resources, and the connection management functions in the network resource management function area. It will request the actual connection level processing. The management service environment provides various types of management services to network operators to control network resources and take information. The management services implemented first of all are network management service and alarm monitoring service.

The functions of the above three parts are logically divided into a user service providing environment and a network resource management environment according to a use purpose. The user service provision environment includes service logic and related resource management functions for providing communication services to any user, and the network resource management environment includes service logic and related resource management functions for providing management services to network managers. The resource management environment includes service logic and related resource management functions to provide management services to network managers. Functions handled in the network resource management environment implement the unique functions of TMN defined by ITU-T such as configuration, failure, performance, complementation, account management function and management service using them. The user service providing environment functions to provide communication services between users to users and subscribers. As a service, various types of services that can be provided in an asynchronous distributed exchange system such as video on demand (VOD) and broadcasting are possible. In order to provide such a service, a process in a user service environment processes an operation of a user using an operation provided by a resource management system. The function of this environment is a connection setting processing function according to a request of a user or an operator, and is implemented through a connection manager in a user service environment and a connection manager setter in a resource management system.

8, 9, and 10 illustrate the communication protocol of the ENS. Between the element management layer (EML) function of the network management system function and the asynchronous distributed exchange system network element, communication between the manager-agent defined in OSI occurs, and for this purpose, CMIP / S (Common Management Information Protocol / Service). ITU-T uses Q3 interface defined for communication between EML and network element function. The communication between the EML network management function and the agent of the network element is implemented in the form of a transaction of an operation for an arbitrary set of MOs and a file transfer type for transmitting large data such as performance data. It is shown at 8 degrees. In the asynchronous distributed switching system, there are two types of manager and agent functions that can be directly communicated as in the case of EMS and HSN agents, and when communicating through intermediate nodes such as in the case of EMS and RSN agents. It is shown in FIG. The type of communication between network management software appears between software items corresponding to an EML, a network management layer (NML), a service management layer (SML), an operator interface, and the like. The infrastructure for communication between these manager functions uses the asynchronous distributed switching system itself. For this purpose, the asynchronous distributed switching system network element provides a protocol as shown in FIG. 10 for communication between the manager functions.

As described above, the present invention multiplexes traffic of DS1E, DS3, STM-1 ATM terminal and DS1E frame relay, DS1E N-ISDN to STM-1, and implements local switching by implementing a cell switching module having a cell switching function. Or to the HSN, which performs the distributed exchange function that forwards it to another RSN or another HSN or ATM switch. In addition, TMN-based EMS can be developed to manage and control integrated networks such as performance monitoring and fault detection for assemblies mounted remotely with all subscribers. In addition, in order to secure the reliability and stability of the system, the main assembly has a 1 + 1 redundancy structure, and it is a switching system having a flexible structure that enables the mounting of the subscriber connection assembly according to the environment of the subscriber where it is installed.

Preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention and such modifications should be regarded as belonging to the following claims. will be.

Claims (5)

One or more RSNs for performing subscriber access and local switching between subscribers, HSN for switching between RSNs or between RSNs and ATM exchange periods, and EMS, a network management system for managing RSNs and HSNs. Asynchronous distributed exchange system. The method of claim 1, wherein the HSN is a cell switching module that performs ATM cell switching between RSNs or between RSNs and exchange periods, and management of data collected by physical layer operation and maintenance functions and ATM layer operation and maintenance functions. And a node control module comprising one or more node management assemblies that perform a communication function with the EMS through the control and agent, and provide a communication channel through the ATM virtual connection between the agent and the EMS of the RSN, an RSN or an HSN and an RSN connection. Inter-node connection module consisting of one or more node-to-node connection assemblies for performing termination functions of STM-1 physical layer and ATM layer, and performing physical layer operation and maintenance function and ATM layer operation and maintenance termination function. It is responsible for accessing HSN and ATM switching period, performs termination function of STM-1 physical layer and ATM layer, physical layer operation and maintenance. Another exchanger connection module, consisting of one or more other exchanger connection assemblies to perform functions and ATM layer operations and maintenance termination functions, converts the network clock supplied from the digital clock supply to the system clock, and fails the digital clock supply clock. A clock distribution module consisting of one or more clock distribution assemblies having a function of switching to a clock received from another exchange connection assembly and having a self-oscillating local clock, a storage device for storing various information required by the node, and an assembly within the node. It provides the necessary power, and the usual power is supplied by two paired power distribution units, providing all the power needed by the shelf from the other power distribution unit that did not fail if one of the two power distribution units failed. For more than one Asynchronous distributed exchange system comprising a power module consisting of a power distribution unit of. 2. The RSN of claim 1, wherein the RSN is configured to terminate DS1E lines and frames, to perform DS1E physical layer operation and maintenance generation and termination functions, and to match an ATM layer for transmitting and receiving an ATM cell to and from which an ATM cell is mapped and transmitted. DS1E subscriber access assembly for function of transmission convergence layer layer, 4 subscriber link division and multiplexing and demultiplexing of cell, and information input from subscriber DS1E link is mapped to payload of AAL1. DS1E Class Emulation Connection Assembly, DS1E-class line emulation connection assembly that provides the same functionality as using a traditional DS1E line, maps and transmits the DS1E alert signal to the ATM payload, and triggers the generation of an ATM end-to-end alert signal when a line failure is detected. Receives frame relay service and maps it to AAL5 function and ATM so that end-to-end frame relay subscriber ATM layer operation and maintenance input from an assembly consisting of a mixture of DS1E-class frame relay connection assembly, DS1E-class subscriber connection assembly, DS1E-class frame relay connection assembly, or DS1E-class line emulation connection assembly for connecting relay subscriber and frame relay network. DS1E multiplexing assembly for termination of maintenance cell and multiplexing and demultiplexing of user cell, termination of frame for transmitting and receiving subscriber and ATM cell to which ATM cell is mapped, transmission convergence unit for matching with ATM layer DS3 subscriber access assembly to handle the functions of the layer and to create and terminate DS3 physical layer operation and maintenance, termination function of ATM layer operation and maintenance cell input from DS3 subscriber access assembly and user cell Multiplexing for multiplexing and demultiplexing Assembly, ATM cell input from subscriber is connected with mapped STM-1, performs termination function of STM-1 physical layer and ATM layer, physical layer operation and maintenance function, ATM layer operation and maintenance termination function Data collected by the STM-1 subscriber access assembly, the cell switching module consisting of one or more cell switching assemblies to perform local ATM cell switching between subscribers, physical layer operation and maintenance functions, and ATM layer operation and maintenance functions. Node control module, which is composed of one or more node management assemblies for communicating with EMS through management and control of agents, and between RSNs or HSNs and RSNs, and termination functions of STM-1 physical layer and ATM layer. One or more nodes to perform physical layer operations and maintenance functions and ATM layer operations and maintenance termination functions. Node-to-node connection module consisting of inter-connection assembly, converts the network clock supplied from the digital clock supply to the system clock, and transfers to the clock received from the other exchange connection assembly when the clock of the digital clock supply fails. A clock distribution module consisting of one or more clock distribution assemblies with an oscillating local clock, storage for storing various information required by the node, and power supply for the assembly within the node. And one or more power distribution units for supplying all the power required by the shelf in another power distribution unit that is not broken in case one of the two power distribution units fails. Asynchronous Distributed exchange system. The method of claim 3, wherein the DS1E subscriber access assembly is multiplexed at the cell level without terminating the ATM header, DS1E is multiplexed to 64 x DS1E, and DS3 is multiplexed to 3 x DS3 and input to one switching port. Asynchronous distributed exchange system. The method of claim 3, wherein the DS3 subscriber access assembly is multiplexed at the cell level without terminating the ATM header, DS1E is multiplexed to 64xDS1E, DS3 is multiplexed to 3xDS3 and input to one switching port. Asynchronous distributed exchange system.