Sidebar: NTT Building Takes The Next Step in BAS

While most companies are struggling with issues related to the creation of a shared IT/building automation system backbone, NTT Data Corp.'s IT Business Development Sector has gone forward with a next-generation BAS in its 27-story A-RE-A Shingawa office building in Tokyo, which opened in June 2003. The components of the BAS -- an energy management system, an IP telephony system and an IP-based security system that includes IP cameras, card readers and door locks -- all share a Gigabit Ethernet fiber backbone. The network is divided into virtual LAN segments at a switch on each floor to separate the different traffic types, says Akira Koshikawa, senior executive manager.

The BAS doesn't yet share data with any other business applications on the IT side, says Koshikawa. Open Web-standards initiatives such as OBIX didn't exist when the system was being developed. But the BAS supports XML to allow interfaces with such applications in the future. "By OBIX standardization, BAS data will form a data repository and will enable life-cycle management of the building," he says.

While the backbone network is shared, individual sensors, actuators and other pieces of endpoint equipment use LonTalk. A LonTalk/IP router on each floor interfaces with the IP backbone and enables IP tunneling. Today, LonTalk is better than IP for small data transmissions, Koshikawa says. But, he adds, "in the future, IP interface equipment with IPv6 technology will take its place."

NTT Data Corp's A-RE-A Shingawa office tower in Tokyo features next-generation BAS technology.
NTT Data Corp's A-RE-A Shingawa office tower in Tokyo features next-generation BAS technology.
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