For optical modules used on switches, we read their information via brand-specific terminal commands. This document explains the Generic PHY Framework along with the APIs provided, and how-to-use. PHY is the abbreviation for physical layer., the USB controller has a PHY to provide functions such as serialization, de-serialization, encoding. ethtool is used to query and control network device driver and hardware settings, particularly for wired Ethernet devices. When the device name is the only argument to ethtool, it prints the current settings of the network device. Not all. In addition to independent devices such as switches and routers, optical modules can also work on network adapters (commonly known as network cards). 40 dBm Module temperature : 39 degrees C / 103 degrees F Module voltage : 3.
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