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Glossary

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.

Channel Service Unit (CSU)

A network device that receives and transmits signals to and from the wide-area-network (WAN) line. The CSU performs loopback testing of signals from the phone company and provides a barrier for electrical interference from either side of the unit (customer premises or phone company).