TIA's Glossary of Telecommunication Terms

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trunk

1. In a communications network, a single transmission channel between two points that are switching centers or nodes, or both. (188) 2. [A] circuit between switchboards or other switching equipment, as distinguished from circuits which extend between central office switching equipment and information origination/termination equipment. [47CFR] Note: Trunks may be used to interconnect switches, such as major, minor, public and private switches, to form networks.

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