Glossary
What is Hot Swapping?
Hot Swap (Hot Swap) that is, powered plug and unplug, refers to the case of not shutting down the system power supply, modules, boards and cards will be inserted into or pulled out of the system without affecting the normal operation of the system, thus improving the reliability of the system, fast maintenance, redundancy and the ability to recover from disasters in a timely manner. For high-power modular power supply systems, hot-swap technology can be used to replace failed power modules while maintaining the voltage of the entire power supply system, and to ensure the normal operation of other power modules in the modular power supply system.
Fundamentals of QAM
Quadrature Amplitude Modulation (QAM) is a widely used modulation technique that combines two key components: amplitude modulation and phase modulation. This dual-modulation approach allows QAM to transmit more data over the same bandwidth compared to simpler techniques like Amplitude Modulation (AM) or Phase Modulation (PM).
QAM operates by using two orthogonal carriers, often referred to as the in-phase (I) and quadrature (Q) components. These carriers are modulated independently, and their combined signal can represent multiple data points, known as symbols. This arrangement forms the basis of the constellation diagram, a graphical representation where each point corresponds to a unique combination of amplitude and phase.
The flexibility and efficiency of QAM make it a cornerstone of modern communication technologies, enabling high-speed data transmission and efficient spectrum usage.
What is WDM?
The WDM refers to Wavelength Division Multiplexing as a very important technology in modern fiber optic communications, which allows multiple wavelengths of optical signals to simultaneously transmit data over the same fiber, thereby effectively increasing transmission capacity. In short, WDM is like a multi-lane highway, different wavelength signals are like various types of vehicles driving in parallel on this “road”, and each wavelength is driving in a different lane.
Unlike traditional time-division multiplexing (TDM) technology, which relies on a single lane and higher speeds to increase traffic flow, wavelength-division multiplexing allows more signals to be transmitted at the same time by increasing the number of lanes, improving the overall utilization of the fiber. As the demand for the Internet grows exponentially, the transmission capacity and efficiency of optical fiber has become one of the core of technological innovation, and WDM is a powerful weapon to meet this challenge.