172
LOCAL AND LONG-DISTANCE NETWORKS
Figure 8.2d
A fiber-optic or wire-pair cable bus feeds several RSUs.
Figure 8.2e
A fiber-optic cable self-healing ring feeds RSUs.
z
Further breakdown among types of business subscribers as a function of white-collar
and blue-collar workers. For example, a large insurance company will have much
greater calling activity than a steel mill with the same number of workers.
z
Cultural factors.
It follows that in regions of high subscriber density typical of urban areas, there would be
many exchanges, each with comparatively short subscriber loops. Such a network would
trend toward mesh connectivities. The opposite would be in rural regions where we
would expect few exchanges, and a trend toward a greater use of tandem working. Long
Summary :
172 LOCAL AND LONG-DISTANCE NETWORKS Figure 8.2d A fiber-optic or wire-pair cable bus feeds several RSUs.
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