![]() ![]() Alternatively, a modular design utilizing smaller C-XC arranged in parallel has been studied. A fully connected, scaleable cross-connect can be built using a Clos architecture, but that approach requires a significant multiplication of the total number of switch ports consumed. Just as the ROADM needs to be reliable, hitless, and scaleable, so does the C-XC. This can improve the reliability of the network at a cost much lower than for 1:1 protection, provided the C-XC is sufficiently reliable.įigure 15.5 depicts the C-XC as a single large device, and no design details are provided. In addition to enabling the statistical multiplexing of transponders, having a C-XC also enables 1:N protection of optical transponder units and client interface cards. ![]() In a dynamic network this drives a requirement that they be “shareable.” In order for transponders to be shared among multiple clients, there must be some switching on the client-side of the transponder. Transponders represent a significant cost in long-haul optical systems, so it is important that they be efficiently utilized. Paparao Palacharla, in Optical Fiber Telecommunications (Sixth Edition), 2013 15.2.4 Client-side switching
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