June 2008
Intermediate to advanced
504 pages
19h 52m
English
Content preview from Enterprise Architecture A to Z
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328 ◾ Enterprise Architecture A to Z
10.2.2.3 Second-Generation Optical Networks
e second generation of optical networking saw the introduction of DWDM technologies to the
existing SONET environment. In this architecture, DWDM terminals are inserted into point-to-
point segments of fiber rings (or even at every point on a ring) where more than just the single-
wavelength capacity is required. By multiplexing up to 80 channels (in the second generation, and
more in the third generation), the capacity of the ring is expanded several dozen times. It needs
to be noted immediately, however, that the cost of DWDM gear is not trivial (e.g., $120,000 or
more per node, with the cost being a function of the number of wavelengths supported), and so,
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