trunking
noun [ U ]
uk/ˈtrʌŋkɪŋ/ us COMMUNICATIONS
a system of shared telephone lines that allows services to be provided to many people at the same time:
Open communications architecture allows companies to reduce costs through new trunking services .
WORKPLACE UK
a cover that is used to hide and protect the electrical wires in a building:
Hollow plastic trunking tidies up the wiring.