- Consist of intrabuilding (within a building) and interbuilding (between buildings) pathways
- Backbone replaces riser, house and building-tie cable terminology and may be either vertical or horizontal
Intrabuilding Pathways
- Provide the means for placing backbone cables from:
- The entrance room or space to telecommunications closets
- Equipment rooms to either the entrance room or space or telecommunications closets
- Consist of conduit, sleeves or slots, and trays
Interbuilding Pathways
- Interconnect separate buildings such as those in campus environments
- Consist of underground, buried, aerial, and tunnel pathways
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