Solidum Systems was a fabless semiconductor company founded by Feliks Welfeld and Misha Nossik in Ottawa, Ontario Canada in 1997. The company developed a series of rule-based network classification semiconductor devices. Some of their devices could be found in systems which supported 10 Gbit/s interfaces. Solidum was acquired in October 2002 by Integrated Device Technology. IDT closed the Ottawa offices supporting the product in March 2009.