What are the common voltages produced by DC power supplies in a hybrid fiber/coax (HFC) fiber optic node?

In hybrid fiber/coax (HFC) fiber optic networks, the common voltages produced by DC power supplies are indeed +5, +12, and +24 VDC. These specific voltages are important because they align with the operational requirements of various network devices used in HFC systems, such as amplifiers, nodes, and other supporting hardware.

• The +5 VDC supply is commonly used for logic circuits and low-power digital components within the node.

• The +12 VDC is often required for powering operational amplifiers and some RF components essential for signal processing within the node.

• The +24 VDC voltage is typically used to supply power to higher power requirements, such as certain RF amplifiers that need greater energy to function effectively.

Using these specific voltage levels allows for compatibility and ensures that the components within the node operate efficiently, reducing the risk of failures and maintenance issues. Meanwhile, other voltage options given in the choices either do not cater to standard operational requirements in HFC systems or are less commonly utilized, thus making them incorrect for this context.