Huawei CX600-8 Hardware Description page 73

HUAWEI CX600-8/16/X3/X8/X16 Metro Service Platform
Hardware Description
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System Clock Unit
As the system clock unit, the MPU provides accurate and reliable SDH clock signals for
LPUs. The MPU can provide three-channel 2.048 MHz synchronous clock signals for the
downstream devices, or receive 2.048 MHz or 2.048 Mbit/s external reference clock signals.
To support IEEE 1588v2, that is, the Precision Time Protocol (PTP), the SDH clock interface
can input time information in multiple formats by selecting specific software.
System Maintenance Unit
As the system maintenance unit, the MPU collects monitored information to test system units
locally or remotely, or implement in-service upgrading of system units.
The MPU periodically collects information about the operation of system units through the
MonitorBus. The MPU then generates related control information based on the collected
information, for example, the detection of board installations and adjustments to fan speed.
Through the joint test action group (JTAG) bus, the MPU remotely or locally tests system units,
or performs in-service upgrades of system units.
Reliability
The main control modules, clock modules, and LAN switch modules on the MPU work in 1:1
hot backup mode, therefore improving system reliability.
The two MPUs work in 1:1 backup mode. Each MPU monitors the status of the other. If the
master MPU is faulty, the slave MPU automatically takes over as the master MPU.
3.5.2 Main Processing Unit B4
Appearance
Figure 3-21
Issue 03 (2013-11-30)
Route calculation: All routing protocol packets are sent by the forwarding engine to the
MPU for processing. In addition, the MPU broadcasts and filters packets, and downloads
routing policies from the policy server.
Outband communication between boards: The LAN switch modules integrated on the MPU
provide outband communications between boards. In this manner, messages can be
controlled, maintained, and exchanged between SFUs and LPUs.
Device management and maintenance: Devices can be managed and maintained through
the management interfaces (serial interfaces) provided by the MPU.
Data configuration: The MPU stores configuration data, startup files, charging information,
upgrade software, and system logs.
Data storage: The MPU provides two interfaces for CF cards, which serve as mass storage
devices to store data files.
shows the appearance of the CX6D0MPUB410.
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