Functions of the CMU on S series switches


The CMU on an S series switch is used to centrally manage power and fan modules of the system.
The CMU provides the following fan module management functions:
- Fan module presence detection
- Fan module registration management
- Fan speed query
- Fan speed control
- Management and report of fan module alarms
- Query of fan module electronic labels
The CMU provides the following power module management functions:
- Power module presence detection
- Automatic shutdown of power module
- Power module registration management
- Voltage and current detection of power module
- Management and report of power module alarms
- Query of power module electronic labels

Other related questions:
Functions of RS485 and MON ports on the CMU of an S series switch
The RS485 and MON ports (using RJ45 connectors) on the CMU are reserved for function expansion in the future. For example, if the switch supports external PoE, the RS485 port connects to the external PoE power module. If the switch supports external environment monitoring, the MON port connects to the sensors (such as temperature sensors and smoke sensors) as an input port for environment monitoring. The preceding functions are used as examples to describe the port functions, and they are not supported by S switches currently.

DHCP functions of S series switches
DHCP dynamically configures and uniformly manages network parameters of hosts on a TCP/IP network. DHCP provides the following functions: - Dynamic allocation: DHCP allocates an IP address with a limited validity period (called lease) to a client. This mechanism applies to hosts that temporarily connect to a network with fewer IP addresses than the total number of hosts and hosts do not need to permanently connect to the network. For example, this mechanism can be used to allocate IP addresses to laptops used by employees on business trips or mobile terminals in cafes. - Static allocation: Fixed IP addresses are assigned to specified hosts. This mechanism applies to hosts with special IP address requirements. For example, the file server of an enterprise needs to use a fixed IP address to provide services for extranet users. Compared with manual IP address configuration, DHCP static allocation prevents manual configuration errors and helps network administrators perform unified maintenance and management. DHCP can allocate other network parameters except for the IP address to hosts, including the DNS server address, routing information, and gateway address.

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