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.


The generic name for telephone companies throughout the world. The term telco encompasses RBOCs, ILECs, CLECs and PTTs.

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