In a SeaTalk NG network installation, backbone cables run the length of the boat carrying both data and power to connected sensors and instruments. Backbone cables are available in pre-made 400mm, 1m, 3m, 5m, 9m and 20m lengths. Backbone cables plug into the blue backbone terminals on T-connectors, 5-way connectors and other network devices. You can also use a backbone cable joiner, A06030, to join any 2 backbone cables to each other and make custom length as needed.