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.

Physical Layer

Layer one of the seven-layer ISO Reference Model for Open Systems Interconnection. This layer is responsible for the transmission of signals—electrical, optical, or radio—between computing machines.

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