Information on other modern electronic and
digital telephone switching of note.
Siemens Digital Switching Systems
Siemens of Germany is a well-known manufacturer of telephone equipment. Their main switch for the public switched telephone network is the the EWSD (Electronic World Switch Digital - a medium to high capacity switch) for both the North American and world markets. Siemens started the manufacture of the EWSD in 1976. It is now a divison of Nokia Siemens.
Siemens EWSD switch (photo: Telcordia)
The Stromberg-Siemens divsion manufactured the DCO (Digital Central Office) as a medium capacity central office switch (see description below).
Stromberg-Carlson Electronic & Digital Switches
Stromberg-Carlson was known for their more famous XY line of Step by Step switches, but in the 1970s developed their own electronically controlled analog switch.
Other digital switches that are in limited use in the North American Market:
Redcom Laboratories: MDX-384
Other Modern Telephone Switching System Pages
Switching Systems - Main Page
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