The first product called the IP Switch ATM 1600 was announced in March 1996 for US$46,000. Its switch used Asynchronous Transfer Mode (ATM) hardware combined with Internet Protocol routing. The company had a role in the development of the Multiprotocol Label Switching (MPLS) network protocol. The company published early proposals related to label switching, but did not manage to achieve the market share hoped for and was purchased for $120 million by Nokia in December 1997. The president at the time was Brian NeSmith, and it was located in Sunnyvale, California.
- Jim Duffy (March 4, 1996). "Start-up takes new IP route". Network World. Retrieved July 4, 2011.
- "The phenomenon of Ipsilon". Technology Inside. February 8, 2007. Retrieved July 4, 2011.
- Peter J. Welcher (August 1, 1997). "Cisco Tag Switching". Chesapeake NetCraftsmen web site. Retrieved July 4, 2011.
- P. Newman et al. (May 1996). "Ipsilon Flow Management Protocol Specification for IPv4". RFC 1953. IETF. Retrieved October 8, 2013.
- (known by Cisco Systems as tag switching at the time)
- Jim Duffy (December 9, 1997). "Nokia catches a falling Ipsilon". Network World. Retrieved July 4, 2011.
- Archive.org's image of Ipsilon's web site taken several months prior to the acquisition by Nokia.
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