>Internet providers and connection speeds
There are three telecom and Internet Service Providers (ISPs) in China: China Unicom, China Telecom, and China Mobile. They are all state-owned entities (SOEs) and each of them acts essentially as a monopoly within their respective markets.
>Data centers contain a set of routers and switches that transport traffic between the servers and to the outside world which are connected according to the data center network architecture.
>CONSTRUCTION PHASE: Three main components of capital expenditures during the initial phase of large data centers are land acquisition, shell construction, and mechanical and electronic equipment purchasing and installation. The construction phase is typically between 18 months and 24 months (Table 5).
>18 to 24 months
>China Unicom’s Northwest Data Center makes the top five with a total square footage of 6,436,818 feet. This facility cost China Unicom 12.3 billion yuan ($1.97 billion.) This location will feature an additional 78,740 feet below ground. This facility is located in Hohhot, Inner Mongolia along with rival China Mobile’s Southern Data Center.
>One of the flaws in the physical design of most data centers is their drop ceilings and raised floors, Jones says. "The walls don't go all the way up [to the ceiling] or down [to the floor]," he says. The drop ceiling leaves a void for an intruder to remove a ceiling tile from a nearby area and then crawl to the data center from above it. "You can crawl down carefully to where you need to drop down," Jones says.
>And raised floors -- built for cabling and cooling purposes -- can also be physically exploited, he says. "With a raised floor, there's a gap between the installed floor and the concrete bottom of the building," he says.
>Jones says crawling in via ceiling tiles or through raised floor gaps are easy ways to get inside without getting noticed or doing any damage to the structure. "I've seen employees take advantages of these weaknesses" for things like going back to get keys they left in the office, he says.
>Thermal resistivity, as used in the National Electrical Code annex, indicates the heat transfer capability through a substance in the trench by conduction. This value is the reciprocal of thermal conductivity and is typically expressed in the units C-cm/watt.
>Inadequately compacted trench backfill also can be an issue. The thermal RHO of this soil can be much higher. In addition, loose soil will dry more easily, which increases the possibility of thermal runaway in a domino effect.
>The definition of failure for a capacitor is simple: failure to meet the specified performance.
However, for power capacitors, failure to meet specification frequently gives rise to dramatic
consequences. Table 2 shows the principal failures associated with power capacitors along
with their consequences.
>Internal breakdown of capacitor leading to explosion and possible fire; hard short or open condition
>thermal runaway in a domino effect.
>largest data center