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E32D161CPN473MEM9M_Datasheet PDF

来源:LM317 Electronics Components编辑:Global Specialties时间:2021-06-15 14:34:33

One vendor estimated that as many as a dozen liquid-cooling offerings are currently available in addition to some homegrown solutions in the works by some web giants. Even immersion systems now have as many as eight competitors showing single- and dual-phase systems.

One immersion vendor, Submer, said that it has four megawatts worth of systems currently in pilots and expects to announce its first deployment with a 10-MW deal within days.

E32D161CPN473MEM9M_Datasheet PDF

Facebook is preparing the way for a flood of accelerators expected over the next year.

E32D161CPN473MEM9M_Datasheet PDF

For example, it is working with Broadcom and Verisilicon on an ASIC for a video transcoder that can handle everything from jerky uploads from handsets to the next series on Facebook Watch. It will be compatible with multiple codecs, including H.264, VP9, and AV1.

The chip needs to handle two 4K streams at 60 frames/second at 10 W and encode multiple streams in parallel. It should also support ffmpeg and VAPI standards, said Vijay Rao, director of technology strategy at Facebook.

E32D161CPN473MEM9M_Datasheet PDF

For AI inference, Facebook wants chips capable of at least 5 TOPS/W. It is working with Esperanto, Habana, Intel, Marvell, and Qualcomm on its open-source Glow compiler for inference.

However, many PoE cables are not in free air. Instead, they are tightly packed with higher-power AC cabling, and run in ducts and plenums with little or no convection airflow, while the building’s ambient temperature in these hidden areas can be easily be in the 100⁰F (38⁰C) range. Add to this heat from the nearby AC cables and the PoE cables can get fairly hot. They will not get hot enough to start a fire since the insulation of qualified cables is highly resistant to ignition nor will it sustain a fire. However, temperature rise does affect performance of data cables, especially in terms of insertion loss and associated bit error ratio (BER). (Side note: Unfortunately, there are many substandard counterfeit cables out there, but with legitimate-looking approvals on the box and insulation — that doesn’t end well.)

Unfortunately, the solution to after-the-fact realization of excessive temperature rise is painful and usually involves pulling and re-routing the PoE cables. There are standards from the NEC and the Telecommunications Industry Association (TIA) that address the issues of what is acceptable. However, the NEC focuses on safety, while the TIA focuses on performance. In general, the standards recommend mitigation through a combination of reducing the aggregate bundle size (number of discrete wires), spreading the cable out via an open cable tray to provide air circulation; and using a cable with a larger conductor size. All of these are far easier to implement during the design and installation phase than to fix afterwards.

The lesson is clear, even though IR-induced voltage drop may not be a problem: I2R thermal dissipation may be, and it will be a problem at both extremes of physical realization from a tiny, nearly invisible, tiny PC board track to longer, highly visible wire cables. Do the simple math and associated modeling on dissipation and temperature rise to make sure you are in the OK” zone.

Related ContentIR drop: The ‘gift’ that keeps on takingStop blaming the supply for your dissipation woes

ReferencesCabling Installation and Maintenance, Can your UTP cables take the heat of PoE?Cabling Installation and Maintenance, The heat is on: Meeting high-power PoE at longer distances

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