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
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
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.