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.

Frame Check Sequence (FCS)

An encoded value appended to each frame by a transmitting station to allow transmission errors to be detected by the receiving station; implemented as a 32-bit cyclic redundancy check (CRC) code.

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