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EXFO is a company that designs and manufactures test instruments and service assurance products for fixed and mobile telecom networks. Its products include optical, transport, datacom, 3G, LTE, copper, xDSL, IMS and VoIP test platforms used by network operators and network equipment manufacturers to assess telecom infrastructure and the telecom services carried on it. EXFO is headquartered in Quebec City, Quebec, Canada, and has over 1200 employees worldwide.