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.


Direction of data traveling from the central office or local-exchange company to the customer premises. In ADSL, the downstream link provides much greater data rates than the upstream link (from customer premises to central office).

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