The communication power supply has two systems

Communication power supplies typically consist of two main systems: the AC power supply system and the DC power supply system, each ensuring reliable and uninterrupted operation of communication equipment.AC Power Supply SystemThe AC power supply system provides alternating current to communication equipment and includes components such as high-voltage power distribution stations, step-down transformers, diesel generators, uninterruptible power supplies (UPS), and low-voltage distribution panels . It can operate in three modes: mains-supplied AC from the utility, self-provided AC from diesel generators, and backup AC from UPS units. This system ensures that communication equipment continues to operate during external power interruptions .DC Power Supply SystemThe DC power supply system converts AC to direct current using rectifiers and provides stable DC voltage to communication devices. It typically includes rectifiers, battery packs, DC distribution panels, and feeder lines . Batteries in parallel with rectifiers allow for floating charge operation, ensuring uninterrupted DC power even during AC supply failures. Modern rectifiers are often high-frequency switching devices that stabilize voltage and improve efficiency .Primary and Secondary Power ModulesWithin communication equipment, primary power supplies (AC/DC rectifiers) provide the main voltage, while secondary power supplies (DC/DC converters) step down the voltage to levels required by specific circuits, such as 1.2–3.3V, ±5V, or ±12V . Secondary modules are often installed on the equipment rack and can be configured in a layered or per-board distributed method, allowing hot-swappable redundancy to maintain operation if a module fails .Redundancy and ReliabilityTo enhance reliability, communication systems may implement dual power supply or dual circuit power supply strategies. A dual power supply connects the system to two independent external sources (e.g., utility + UPS), switching automatically if one fails . A dual circuit power supply divides internal power delivery into two independent circuits, ensuring that critical components continue to receive power even if one circuit fails . These strategies are often combined in mission-critical systems to maximize uptime.Grounding and SafetyBoth AC and DC systems require proper grounding to protect equipment and personnel, reduce noise, and maintain communication quality . Effective grounding is essential for stable operation and safety in fixed communication stations. In summary, the two systems of a communication power supply—AC and DC—work together with primary and secondary modules, redundancy mechanisms, and grounding to ensure continuous, stable, and reliable power for communication networks .