The company also uses the
telephone switching term "crossbar" to denote a nonblocking bidirectional matrix such as the new 03-Series.
Engineers later fixed the problem, which NTT West said sprang from problems at some local
telephone switching stations.
Improvements to the existing building include sophisticated
telephone switching for electronic communications and broad bandwidth cabling for advanced computer services.
It connects to a
telephone switching system and requires an "always on" Internet connection such as a T1 or DSL line.
Jordan has aided in the development of
telephone switching systems, Federal Aviation Administration air traffic control and U.S.
For 14 months, the scientists monitored the air inside and outside a
telephone switching facility in California for concentrations of ozone, nitric oxide (NO), and nitrogen dioxide ([NO.sub.2]) -- all major components of smog.
As a part of the investment, an USD80m Mobile
Telephone Switching Office (MTSO) was built outside Cincinnati, through which calls and data transmissions from southwestern Ohio are processed and permanent backup generators were installed at an additional 91 Ohio cell sites to ensure network functionality during times of crisis.
DSL services are provided by installing digital-format modems in both a subscriber's home and an NTT
telephone switching station.
But as
telephone switching equipment has become more sophisticated, so have the environmental requirements for the rooms where these electronic wonders are housed.
Division, which sells
telephone switching systems to U.S.
In addition, most
telephone switching offices used electromechnical switches -- known to emit EMFs -- until the 1980s, when they were replaced by computer-driven electronic switches.
