October 2007
Intermediate to advanced
368 pages
10h 55m
English
Content preview from Passive Optical Networks
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After the RTD is measured, the transmission timing of the ONU has to be
adjusted and there is one more point to keep in mind. That is the time interval
(or guard time) between the signals transmitted by a certain ONU and those
transmitted by other ONUs. There must be sufficient guard time so that the
signals from different ONUs do not collide. This guard time interval is called
burst overhead (BOH). The following factors influence the size of burst
overhead:
1. Error in RTD measurement: RTD measuring comes with errors and we
must anticipate errors caused by clock jitters and the quantization of RTD
values.
2. Change in RTD: The change in RTD is about 36 ps/km/8C, owing to the
temperature dependence of the refractive index and thermal expansion of
the ...
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