H3C's Practices in Energy Efficient Design
Choosing Energy-Efficient Power Supply
H3C has begun to use external power adapters compliant with CEC, U.S. government’s ENERGY STAR program and Europe Code of Conduct (COC) regulations. These power adapters can reach over 80% of energy-to-efficiency ratio, and consume less than 300 mW of power when in standby mode (the adapters are in standby mode at most time); compared 750 mW power consumption of a popular 60W adapter in standby mode.
H3C adopts the state-of-the-art power system with high performance, high power density, and low power consumption in standby mode, saving more than 20 percent of power compared to the products of the same type.
Developing Intelligent Cooling Scheme
H3C is among the first to develop intelligent cooling solutions. In our products, we adopt the PWM intelligent fan speed control scheme. With this scheme, the fan speed can be dynamically adjusted based on the temperature and traffic of network devices. In a lower-temperature equipment room, the fan speed can be automatically lowered to decrease noise, power consumption and system dust buildup; in a higher-temperature equipment room, the fan speed can automatically increase for system dissipation. Fans running at low speed consume 25 percent of the power consumed when running at full speed. In addition, fanless design is adopted on some low-end switches to save power consumed by fans and eliminate fan noise.
Adopting Advanced Techniques and Energy-Efficient Chips
In the design of its products, H3C has developed the intelligent management software, to match the use of industry leading high-density, low power-consumption chips thus improving the system performance, meanwhile reducing the overall system power consumption. The Ethernet ports on the H3C Ethernet switches adopt the sleep mode, in which the Ethernet ports are automatically shut down if there is no data link, making the power-consumption the least; when there is data transmission, these ports are automatically brought up to work normally. Some H3C products feature with hybrid electrical and optical interfaces on a single circuit board, reducing customer investment and the system power consumption.
Improving Product Reliability to Extend Product Life
H3C has a specialized team dedicated to the reliability design and thermal design of products. In early design phase of a product, the team sets strict reliability specifications. In the development phase, methods such as Failure Mode and Effects Analysis (FMEA), Highly Accelerated Life Test (HALT), thermal emulation, and thermal test are adopted to improve the reliability and thermal performance of the product; in the manufacturing phase, Highly Accelerated Stress Audit (HASA) is introduced to improve product reliability and robustness. All these reliability improvement efforts throughout product life cycle help extend product lifetime, minimizing the contamination of the products to the environment.