Architecture of the host maintenance system of UMG8900

The UMG8900 provides two types of maintenance channels: fast Ethernet (FE) and maintenance bus (MBus). The maintenance and management inside frames are in both FE and MBus modes. The maintenance and management of the UMG8900 are implemented through cascading FE channels between frames.

The following takes a single SSM-256 frame as an example. Figure 1 shows the architecture of the host maintenance system.

Figure 1 Architecture of the host maintenance system 

The host maintenance system consists of three types of modules: back administration module (BAM), front administration module (FAM), and MBus, as well as two types of buses: control area network (CAN) and FE. The functions of these modules and buses are as follows:

• BAM: The BAM is located on the OMU, as an embedded hard disk or CF card. It provides the interface between the UMG8900 and the local maintenance terminal (LMT). The LMT and the BAM are in the standard client/server mode. The LMT acts as the client to manage the whole UMG8900 by communicating with the BAM through TCP/IP-based man-machine language (MML) protocols and binary protocols.
• FAM: The FAM is located on the boards with upper layer software. Boards communicate with each other and service boards communicate with the OMU/MPU/TNC all through the FAM. The control messages between internal modules and the OM messages are transmitted and exchanged through FE buses between FAMs.
• MBus: The MBus achieves management and maintenance of hardware, including lower layer maintenance highly requiring real-time operation. The functions of the MBus include power control, environment monitoring, board archive management, alarm generation, and hot plugging management. Every board is equipped with an MBus module. The MBus module collects the data of the board and then sends the data to the FAM through the CAN bus.

The UMG8900 provides two types of maintenance channels: fast Ethernet (FE) and maintenance bus (MBus).

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UMG8900 provides two types of maintenance channels: fast Ethernet (FE) and maintenance bus (MBus)