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ترنسپوندر
The multiplexing function is most commonly accomplished via a wavelength- division multiplexing (WDM) transponder equipped with multiple client-side feeds.
This is referred to as a multiplexing transponder, or simply, a muxponder.
The price premium for a muxponder versus a regular transponder is typically small.
WDM transponders are required for all network traffic entering the node, regard- less of whether the traffic is just transiting the node.
With the architecture of Fig. 6.3, not only are transponders and router ports needed for this traffic, but also the contents of the wavelength are unnecessarily processed by the IP router.
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