Retronetworking

h1. ISDN Switches

ISDN Switches (or ISDN exchanges) were digital telephony exchanges supporting the ISDN protocol.  

All major manufacturers of telephony switching equipment produced ISDN-capable switches at some point.  In Germany, Alcaltel S12 and Siemens EWSD were the two widely deployed ISDN switches.

h2. Preserved digital telephony switches (mostly ISDN capable)

|_.Manufacturer|_.Model|_.Used in Country|_.Location/Owner|_.Operational|_.24/7|_.Contact|

|Siemens|EWSD|Germany|"Andreas Eversberg":https://eversberg.eu/ (Dörphof, Germany)|Yes|No|@jolly|

|Siemens|EWSD|Czech Republic|Brno, Czech Republic|Yes|Yes|Jan Pesak|

|Siemens|EWSD|Germany|"MSPT Heusenstamm":https://sammlungen.museumsstiftung.de/sammlungsstandort-heusenstamm/, Germany|Yes|No|@NT2MKU|

|Siemens|EWSD|Germany|"Nordlab e.V.":https://www.nordlab-ev.de/ Flensburg, Germany|Yes|No|@wimpy|

|SEL Alcatel|S12|Germany|"Fernmeldemuseum Bottmersdorf":http://www.fernmeldemuseum-bottmersdorf.de/home.htm, Germany|No|No|?|

|SEL Alcatel|S12|Germany|"MSPT Heusenstamm":https://sammlungen.museumsstiftung.de/sammlungsstandort-heusenstamm/, Germany|No|No|@NT2MKU|

|Lucent|7 R/E 5ESS|USA|"Arizona, USA":http://kev009.com/wp/2024/07/Lucent-5ESS-Rescue/|No|No|kevin.bowling [at] kev009.com|

|Lucent|5ESS|USA|"Orlando, Florida, USA":https://telephoneworld.org/landline-telephone-history/preserving-a-5ess-switch/|No|No|"Dylan Cruz":http://npstn.us/|

|Ericsson|AXE-104|Australia|Museum in Melbourne, Australia|?|No|?|

|Nortel|DMS-100|USA|"joe_z":http://www.dms-100.net/telephony/nortel/dms-100 (Chicago, USA)|Yes|No|joe_z|

|Nortel|DMS-10|USA|"Connections Museum":https://www.telcomhistory.org/connections-museum-seattle/ (Seattle, USA)|Yes|No|?|

h2. Further reading

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