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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.

Central Office (CO)

A telephone company facility within which all local telephone lines terminate and which contains the equipment required for switching voice communications across the telephone network. For DSL service, special equipment is set up at the CO to support DSL service for customer lines terminating at the CO. COs are not necessarily offices; often, they are more like centrals contained in large cabinets.