This module is one of the essential components of the NE software. It employs bytes K1 and K2 in the multiplex section overhead (MSOH) to execute ring, linear 1+1 and 1:1 protection switching protocols. Also, it harmonizes actions of the NE software modules and boards that are involved in the protection switching, and exchanges and controls the protection information through the communication channel between the boards. The MSP switching module provides the following functions:
n Storing and sending the MSP switching data.
n Configuring and querying the MSP switching information, including node ID, recovery time and switching events.
n Supporting two-fiber unidirectional/bidirectional MS ring protocol.
n Supporting four-fiber bidirectional MS ring protocol.
n Supporting 1+1/1: N (N £ 14) linear MSP protocol.
5. Database Management Module
This module is an organic component of the NE software, composed of database and management system. Database comprises several sub databases, including network database, alarm database, performance database and equipment database. Databases are backed up in different memories, thus providing a powerful protection mechanism. The database management module implements functions below:
n Organizing and accessing all data in the database, including operations such as query, copy, deletion and comparison.
n Automatic recovery and upgrade mechanism of the database.
n Sharing and exchanging data between application modules.
n Providing standard language interface for accessing database for the application program.
n Entering protection mode and waiting for maintenance when several abnormal resets are detected in a short time period.
6. Real-Time Multi-Task Operating System
The real-time multi-task operating system of the OptiX OSN 9500 NE software is responsible for managing public resources and supporting application programs. It isolates the application programs from the processor and provides an application program execution environment which is independent of the hardware of the processor.
2.2.5 NM
The NM software runs on the workstation or PC, mainly managing the equipment and the transmission network. It enables the user to operate, maintain and manage the transmission equipment. Management functions of the NM software include the following aspects:
n Alarm management: Real-time collects, prompts, filters, browses, acknowledges, checks, clears, counts the alarms, and fulfills alarm insertion, alarm correlation analysis and fault diagnosis.
n Performance management: Implements real-time setting of performance monitoring; browsing, analyzing and printing performance data; forecasting medium-and-long term performance; and resetting performance register.
n Configuration management: Configures and manages the interface, clock, service, trail, subnet and time.
n Security management: Implements NM user management, NE user management, NE login management, NE login lockout, NE setting lockout and local craft terminal (LCT) access control of the equipment.
n Maintenance management: Provides loopback, board resetting, board temperature threshold setting, automatic laser shutdown (ALS) and optical fiber power detection, and collects equipment data to help the maintenance personnel in troubleshooting.
The NM exercises a unified management over the optical transmission network and provides maintenance function for all ION, SDH, Metro, and DWDM NEs in the entire network. In compliance with ITU-T Recommendation, it is a network management system integrating standard management information model and object-oriented management technology. It exchanges information with NE software through the communication module to implement monitoring and management of equipments over the network.
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