October 2007
Intermediate to advanced
368 pages
10h 55m
English
Content preview from Passive Optical Networks
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1500-nm wavelength band. Because each node receives the entire original signal,
each downstream packet contains a header identifying the ONU that should
receive the packet. The downstream traffic may use encryption to restrict each
ONU to decode only the part it is supposed to receive.
Each ONU gets synchronized with the OLT by extracting the clock from
downstream traffic. Some PONs can be configured to change bandwidth alloca-
tions to individual ONUs on the fly, depending on the users’ needs. This enables
carriers to better utilize their systems and also provide premium users with more
bandwidth. As explained in Chap. 2, some systems use the 1550-nm-wavelength
window in downstream for CATV video broadcast-service overlay.
The more challenging aspect ...
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