October 2007
Intermediate to advanced
368 pages
10h 55m
English
Content preview from Passive Optical Networks
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2.5.2 Burst Mode Operation and Ranging
In the downstream direction, the OLT interleaves frames destined for differ-
ent ONUs as a continuous stream and broadcast to all ONUs. Each ONU
extracts its own frame based on the header address.
In the upstream direction, each ONU has its own optical transmitter to
communicate with the OLT. Since there is only one optical receiver at the
OLT, ONUs need to take turns to send their data to the OLT. In a conventional
transmission system, the transmitter and its receiver always maintain synchron-
ization by transmitting an idle pattern when there is no data to send. In a PON
system, when an ONU is not sending upstream ...
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