COVID-19: As a designated essential telecom solutions provider, EXFO remains fully operational with our employees' health and safety as our top priority.

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Technology evolves at a rapid-fire pace. That’s why we’ve built an easy-to-use glossary to help you better understand the terms, technologies and trends that impact your business.


Legacy systems are infrastructure, standards or protocols that have been largely deployed by network operators for a particular service and that are still active to ensure basic service delivery.

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