Information Technology Reference
In-Depth Information
FIGURE 1.9
Horizontal testing structures and links.
Backbone wiring may be implemented in a daisy-chain (hub-to-hub-to-hub)
fashion, or in a star fashion, as shown in Fig. 1.10. In a network topology that must
guard against too many repeater jumps, such as Ethernet, the star connection for
backbone wiring provides advantages. Since TRs in large buildings are frequently in
a services shaft, one above the other, distances between TRs are minimal.
Thus, the backbone wiring from each floor may be concentrated in a single
master TR and the number of repeater jumps minimized. For other topologies, such
as Token-Ring, it might be more convenient to daisy-chain the ring-in/ring-out from
floor to floor. In any event, the maximum cabling distances must still be observed.
Backbone cabling may be terminated in the same manner as horizontal cabling.
The backbone cable should be of a category and type that meets your performance
