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.

Basic-Rate Integrated-Services Digital Network (BRI-ISDN)

The basic-rate ISDN interface provides two 56/64 kbit/s channels (called B channels) to carry voice or data and one 16 kbit/s signaling channel (the D channel) for signaling/call information.

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