Siemens DCO
Encyclopedia
Siemens DCO was introduced in 1977 by Stromberg-Carlson
. The Stromberg-Carlson DCO was the first digital Class 5 telephone switch installed in the USA. Stromberg-Carlson put their switch into service in July 1977 in a telephone exchange
in Richmond Hill, Georgia
.
The DCO came as DCO-SE (Digital Central Office - Small Exchange) for line side Central Office operation and the DCO-CS (DCO-Carrier Switch) for Long Distance carrier
services. A few DCO's were created for the cellular phone networks, but this was very limited.
In 1990 Siemens purchased Stromberg Carlson and moved its EWSD
production to the Lake Mary
, Florida
production facility in 1991. In the next few years Siemens slowly phased out the DCO as a line side central office switch. The DCO-CS was continued through the 1990s to support regional LD companies. The DCO-CS was small on port capacity (just under 10,000), but was robust on features, more than most other carrier switches.
As the 1990s came to a close, many regional long distance companies were being bought up, or going out of business as their profitability had diminished. This also brought an end to DCO production as Siemens-Stromberg Carlson focused on marketing the EWSD
.
In 2006 the entire Siemens DCO line was sold to Genband
, originally a VoIP gateway / softswitch company from Texas, USA.
Stromberg-Carlson
Stromberg-Carlson was a telecommunications equipment and electronics manufacturing company formed in 1894 as a partnership of Alfred Stromberg and Androv Carlson. Along with four other companies, it controlled the United States national supply of telephone equipment until after World War...
. The Stromberg-Carlson DCO was the first digital Class 5 telephone switch installed in the USA. Stromberg-Carlson put their switch into service in July 1977 in a telephone exchange
Telephone exchange
In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls...
in Richmond Hill, Georgia
Richmond Hill, Georgia
Richmond Hill is a city in Bryan County, Georgia, United States. The population was 6,959 at the 2000 census. It is part of the Savannah Metropolitan Statistical Area.-Geography:Richmond Hill is located at ....
.
The DCO came as DCO-SE (Digital Central Office - Small Exchange) for line side Central Office operation and the DCO-CS (DCO-Carrier Switch) for Long Distance carrier
Interexchange carrier
An Interexchange Carrier is a U.S. legal and regulatory term for a telecommunications company, commonly called a long-distance telephone company, such as MCI , Sprint and the former AT&T in the United States...
services. A few DCO's were created for the cellular phone networks, but this was very limited.
In 1990 Siemens purchased Stromberg Carlson and moved its EWSD
EWSD
EWSD is one of the most widely installed telephone exchange systems in the world. EWSD can work as a local or tandem switch or combined local/tandem, and for landline or mobile phones...
production to the Lake Mary
Lake Mary, Florida
Lake Mary is a city in Seminole County, Florida, United States. The population was 11,456 at the 2000 census. As of 2009, the population recorded by the U.S. Census Bureau is 15,230...
, Florida
Florida
Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...
production facility in 1991. In the next few years Siemens slowly phased out the DCO as a line side central office switch. The DCO-CS was continued through the 1990s to support regional LD companies. The DCO-CS was small on port capacity (just under 10,000), but was robust on features, more than most other carrier switches.
As the 1990s came to a close, many regional long distance companies were being bought up, or going out of business as their profitability had diminished. This also brought an end to DCO production as Siemens-Stromberg Carlson focused on marketing the EWSD
EWSD
EWSD is one of the most widely installed telephone exchange systems in the world. EWSD can work as a local or tandem switch or combined local/tandem, and for landline or mobile phones...
.
In 2006 the entire Siemens DCO line was sold to Genband
Genband
GENBAND is a privately held company which makes IP multimedia application and infrastructure products and solutions for fixed wire line, mobile, and cable network service providers. The company was formed in 1999 as General Bandwidth and since 2010 is headquartered in Frisco, Texas.It has major...
, originally a VoIP gateway / softswitch company from Texas, USA.