A network architecture traditionally used in cable television and early broadband systems. It relies on a high-capacity main trunk cable that splits into secondary branches, which then split again into smaller drop lines connecting individual subscribers. While efficient for distributing a single broadcast signal outwards, this topology struggles with upstream traffic and is prone to widespread outages if a trunk line fails.
The old coax plant is pure tree-and-branch, so a single amplifier failure on Main Street drops the whole neighborhood.
Related terms
DOCSIS
Data Over Cable Service Interface Specification defines how high-speed data is transmitted over coaxial television networks.
Last mile
The final segment of a telecommunications network that physically reaches the customer premises.
Coaxial cable
A copper transmission line built with a central conductor surrounded by an insulating layer and a braided metallic shield.