Optical Networks and Technologies by Ken-ichi Kitayama, Francesco Masetti-Placci, Giancarlo Prati

By Ken-ichi Kitayama, Francesco Masetti-Placci, Giancarlo Prati

This booklet is of curiosity to either educational researchers operating within the box of optical fiber verbal exchange. the point of interest is on engineering networks exploiting complicated optical applied sciences. initially awarded at OpNeTec 2004, the chapters hide optical community platforms, transmission, and amplification; theoretical facets; process implementation; and experimental test-beds.

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The TCP window size is the amount of data able to be sent without acknowledgement. There are theoretical limitations to TCP-window-based flow control. The configuration guideline is “window size > Required TCP throughput x RTT ”. The TCP window size of the system was extended to 4 MByte from its initial 64 KByte value. Measured throughput was increased from 8 Mbps to 50 Mbps. Theoretically, extension of window size is enough, but it is impossible to extract real high speed. To improve the performance, we increase the number of TCP connections between the server and the real-time CODEC.

Thus trails are bound to be of longer lifetime and higher capacity. However, these network layers have historically been designed quite separately. They have different control technologies, operating procedures and user interfaces. However we believe that these elements (bandwidth planning, customer contracts allowing variation of capacity, network optimization) can and will be integrated together into operator systems. These systems will automatically drive fast provisioning in the network. Standardization between vendors, between operators and between technologies will allow much simpler systems, which will translate into long term cost savings for operators.

This counting of resource for admission control can in principle be done at least three ways. 1. Directly by reserving the resource by signalling through the set of network nodes (using RSVP, for example) 2. In the application, for example using circuit and route control in a Softswitch 3. Using a separate logical layer of “bandwidth managers” We believe it is important that next generation networks allows common mechanisms to support these functions for all services needing guarantees, and thus we think this function should be separated from individual applications.

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