Siemens DCO

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Siemens DCO (Digital Central Office) was introduced in 1977 by Stromberg-Carlson. The Stromberg-Carlson DCO was the first Class-5 digital local office switching system installed in the USA. Stromberg-Carlson put their switch into service in July 1977 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. There were a few DCO's 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, an IMS company from Texas, USA.^[1]

[edit] Reference

[edit] External links

• Siemens DCO Homepage

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