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NTT Comms opens disaster-proof data center in Osaka, Japan

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Full-scale disaster recovery facility will protect mission-critical data

NTT Communications Corporation (NTT Com), a subsidiary of the NTT Group, has launched its fifth data center at Nishi-ku, in the heart of Osaka, Japan. Called Osaka 5, the facility offers approximately 3,500 sq m of white space, equivalent to 1,600 racks. It is conveniently located 60 minutes away from Kansai International Airport.

The new data center comprises eleven floors and is the latest addition to NTT Com’s Nexcenter service, which combines disaster countermeasures and customized network environments.

The network environment


Data center control room

Source: NTT-Communication

To ensure that customers have uninterrupted access to a high-quality, low-latency network, the Osaka 5 data center is connected directly to NTT Com’s main data center in western Japan, which accommodates Internet exchange (IX) via optical fiber.

In addition to NTT Com’s high-volume Internet backbone and network services, including the Arcstar Universal One virtual private network, customers can use the data center to build seamless ICT environments, connecting third-party cloud providers with data centers worldwide.

It is planned that, from this March, a new secure, low-latency data center connection service will enable customers to use NTT Com’s five data centers in Osaka city as if they were one facility. It will offer up to 10Gbps circuits or optical fibers.

Trying out new cooling solutions to reduce PUE

To reduce the facility’s PUE, NTT Com is using a ’cooling wall’ which blows cold air into the server room, in addition to using indirect outside air cooling.

In the last few years, the company has expanded its data center estate and related services in the Tokyo metropolitan area to meet the growing demand for IT infrastructure. At the same time, customers have been increasingly seeking backup sites in western Japan, which are far enough from Tokyo to serve business continuity purposes in the event of a natural disaster.

Osaka 5 Data Center Specifications



• Nishi-ku, Osaka 





11-story steel structure with seismic-isolation construction


Seismic Proofing


• Seismic-isolation system decreases seismic shocks by up to 80%

• System to minimize vertical shaking in a locally centered earthquake

• Withstands seismic forces equal to those of Kobe Earthquake or Great East        Japan Earthquake


Maximum Load


1,500 kg/m2



Power Receiving


• 77,000 extra-high-voltage power

• Main line and standby power supply system

• Sourced from two different power substations

• Total power: 17MVA (+17MVA standby)




• N+1 redundant configuration

• Power for more than 48 hours without refueling




• N+1 redundant configuration

• Battery power for more than 5 minutes



• Water cooling

• N+1 redundant configuration

• Indirect outside air cooling

• Cooling wall system

Fire Protection


• Nitrogen gas fire-extinguishing systems

• High sensitivity smoke detectors



• Dedicated system requiring online application for access

• Requires IC card at security gate and biometric authentication

• Surveillance cameras and individually locked racks

• Custom systems for financial institutions, etc. requiring higher security

Others Facilities


Rental offices (approx. 420m2) and meeting rooms



• Direct connection to disaster-resistant cable tunnel

• Direct connection to NTT Com transmission service node

• Four routes for multi-carriers (NTT Com circuits from two different transformer substations possible)

Green Index


PUE: 1.38 (designed value)

Certifications (planned)


• ISO27001

• ISO20000



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