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See Link trunking, Link aggregation

Snippet from Wikipedia: Trunking

In telecommunications, trunking is a technology for providing network access to multiple clients simultaneously by sharing a set of circuits, carriers, channels, or frequencies, instead of providing individual circuits or channels for each client. This is reminiscent to the structure of a tree with one trunk and many branches. Trunking in telecommunication originated in telegraphy, and later in telephone systems where a trunk line is a communications channel between telephone exchanges.

Other applications include the trunked radio systems commonly used by police agencies.

In the form of link aggregation and VLAN tagging, trunking has been applied in computer networking.

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