Cisco 2020 Environment Technical Review 40 feedback?
GHG emissions source. To address these challenges, Cisco is investing in five primary product energy
efficiency engineering initiatives. These initiatives were chosen because they enable the largest impact
on improving our products’ energy consumption.
• Power initiative: We are improving the efficiency of our products from plug to port and set a product
power efficiency goal in early FY18. This goal is to improve large rack-mounted- equipment system
power efficiency—as measured from the input power from the facility to the board-mounted ASICs,
memory, and other chip devices—from 77 percent to 87 percent by FY22 (FY16 baseline). Read more
about this goal in our goal announcement blog post. Progress toward this goal is shown in Table 33
. To
achieve this power efficiency goal we are reducing resistance – the hindrance of the flow of electrons –
in our Printed Circuit Boards (PCBs) and other components through the use of better conductive
materials. By reducing the overall resistance, we can decrease the energy lost as heat, increasing the
overall system level efficiency and reducing the amount of heat that needs to be exhausted from the
system.
• Thermal initiative: Commonly used forced air-cooling systems have limitations in cooling higher
powered next-generation products. As such, we are exploring alternative methods of cooling such as
liquid or refrigerant cooling, which will reduce power used by the products dedicated to cooling.
Currently, liquid and refrigerant cooling is technically feasible, but implementation is dependent on
customers upgrading their facilities to integrate properly with these cooling methods. Where appropriate
we advocate for the use of liquid or refrigerant cooling, but until these methods are more widely
adopted, we continue to develop advanced thermal techniques and optimize traditional forced air
cooling to remove heat from our products.
• High-speed interconnects and ASIC initiatives: High-speed silicon-to-silicon or optics-to-silicon
interconnects are an integral part of routing and switching systems. As throughput (or bandwidth)
requirements increase, the interconnects can consume a significant portion of the total system power.
Through advancements in optics, we can deliver increased bandwidth using the same or less power
compared with earlier generation interconnects. Previous generation ASIC packet processing
technology designs consumed large amounts of power. The Cisco Silicon One ASIC architecture, a
complete redesign, has allowed the ASIC to be twice as efficient than previous ASIC technologies while
enabling a move from Gbps to Tbps capacity with a single ASIC. For more information on how the
Silicon ONE is reducing energy, read our blog here
.
• Customer facilities initiative: We are working with customers to reduce the amount of energy required to
operate IT facilities with power solutions that increase the efficiency of overhead power, avoid step-
down transformers, and provide integrated cooling strategies. These end-to-end solutions reduce
hardware requirements and energy consumption while providing a more integrated method for
managing IT infrastructures. Our customers are constrained by the total amount of electricity that can
be delivered to a given data center. Because of this, every watt counts and delivering electricity to our
products in the most efficient way is becoming an even higher priority. Currently, data centers are using
208 or 239VAC or 48/60VDC inputs, while the most efficient input voltage is 277VAC or 380VDC. There
has been low adoption of the 380VDC input voltage due to concerns over safety. To alleviate these
safety concerns we are working with customers to design and implement fault managed power systems
which can be integrated into connected building applications and reduce the cost of building out of
future electrical infrastructure. To reduce energy consumption at facilities even more, we have proposed
an improved cooling system with a smart HVAC system. The paper can be found in Technical
Disclosure Commons here
.
• Power Supply Initiative: Power supplies play a critical role in managing product energy efficiencies, as
they are the first step where energy is lost. To overcome this loss, we are working to offer more energy-
efficient options for power supplies, giving customers the option of platinum or titanium 80+ rated power
supplies whenever possible. This provides cost-sensitive customers the option of selecting lower-rated
power supplies, such as gold or silver, while allowing customers concerned about reducing their total
energy use to select the higher-rated supplies. Over 50% of the new power supplies designs we
developed last year were tested for a rating of platinum and above. This initiative also includes
developing power supplies with wide-ranging AC and DC inputs that support AC/HVAC/HVDC for 200-
277VAC or 240/380VDC. These designs allow us to support both AC and DC with legacy low input AC
voltages or higher voltages that have higher efficiencies. Once customers begin to switch to 380VDC,
we will develop power supplies that are optimized for this input voltage. For external power supplies, we
ship products that are DOE6 compliant, aligning with the latest U.S. energy efficiency standards.
When we evaluate product energy efficiency, we consider the power performance of the entire system.
We measure the percent efficiency as electricity passes through each component or function. This can