Control and monitoring plane functions are implemented by control units on the main
processing units (MPUs) and LPUs.
1.6.2 Signal Flow on the Control Plane
The control plane, functioning as the nerve center, integrates control and management
functions and uses buses to control system units.
The control plane consists of control units on MPUs and those on other boards. Each MPU is
comprised of the following three functional units:
System management and control unit and system clock unit: work on the control plane.
System maintenance unit: works on the monitoring plane. For more information, see
section "Signal Flow on the Monitoring Plane" in this document.
MPU units and board units communicate through system buses and the SFU.
Signal Flow on the Control Plane
Figure 1-4 illustrates the principles of signal flow transmission on the control plane.
Figure 1-4 Signal flow transmission on the control plane
The control plane processes the following signal flows:
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