Exhibit 21.1 LIST OF SUBSIDIARIES NAME JURISDICTION OF INCORPORATION Data Switch GmbH Elektronische Systeme Germany Data Switch Subsidiary Stock Corporation Delaware Data Switch U.K. Limited U.K. General Signal Networks (Germany) GmbH Germany Inrange Development Corporation Delaware Inrange Technologies Canada Inc. Canada Inrange Technologies GmbH Germany Inrange Technologies Holding S.A.S. France Inrange Technologies Italia, S.r.1. Italy Inrange Technologies Ltd. U.K. Inrange Technologies S. A. (Belgium) Belgium Inrange Technologies S. A. (Switzerland) Switzerland Inrange Technologies S.A.S. France Inrange Financial Corporation Delaware Inrange Global Consulting, Inc. Delaware 69