Red squares show where different cables connect, mostly in major population centers. Called NSFNET, it was a T1 line that connected 170 smaller networks together and operated at 1. IBM, MCI and Merit worked with NSF to create the backbone and developed a T3 ( 45 Mbps) backbone the following year. 544 Mbps ( million bits per second). Parallel backbone is a variation of the collapsed backbone, where devices are having more than one connection between them. Collapsed backbone. Backbone fiber lines. Sep 15, · This map shows the long- haul fiber that carries Internet data around the United States. It is typically a fiber optic trunk line. Parallel backbone. Backbones are typically fiber optic trunk lines.
How can the answer be improved? Maps are links to material on company websites wherever possible. As Figure 5 shows, there are multiple connections between the high level routers and the network segments.