control and monitoring planes are working together to support the operation and maintenance
of a device and improve performance stability.
Both the control plane and monitoring plane consist of the system operation and maintenance
unit and the monitoring units on LPUs and an SFU. Inter-board communication is
implemented using the system backplane.
Figure 1-6 illustrates the principles of signal flow transmission on the monitoring plane.
Figure 1-6 Signal flow transmission on the monitoring plane
The monitoring plane, like the control plane, supports bidirectional signal flows.
Board-to-LPU signal flow: implements monitoring. The system maintenance unit on
each LPU uses a MonitorBus to collect operating information on system units and
generates control information based on the unit-specific operating status.
LPU-to-board signal flow: implements control. An LPU delivers control information to
modules to monitor board information, such as the installation and operating status and
fan speed. The LPU also loads a bus to locally or remotely test or upgrade system units.
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