The building of such fiber
extension takes a few months of planning, permits, and actual deployment. Besides
the time and the lost opportunity cost, the cost of laying fiber to each service point can
range from $50,000 to $120,000. Therefore, in the absence of alternate solutions, the
cost of trying to deliver Ethernet services can be staggering.
With the deployment of optical wireless mesh networking, the cost can be significantly
lower. Consider an identical scenario of trying to deliver Ethernet services in
a metro environment by means of ???fiber extension???; the up-front capital expenditure
incurred per service point can be lowered to close to $10,000. Provided the presence of
a fiber at one location (POP), the cost of extending the service by one hop to a neighboring
building can be achieved by means of an FSO link and Ethernet service??“capable
switching equipment located at the service point. The cost of such a switch can be less
than $5,000 since the number of ports needed for such switches is fairly low. The cost of
an FSO link can also be less than $10, 000. (This assumes that the distance between the
POP and service point is less than a few hundred meters so that FSO links designed for
short-range operation can be used.
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