October 2007
Intermediate to advanced
368 pages
10h 55m
English
Content preview from Passive Optical Networks
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Let us first give a simple explanation on how DBA operates (Fig. 5.5).
1. The ONU stores the upstream traffic received from the user in the buffer.
2. Next, the data volume stored in the buffer is notified to the OLT as a request
at a time prescribed by the OLT.
3. The OLT specifies the transmission start time and available duration
(¼transmission window) to ONU as a grant, taking into account the notified
volume and service specifications.
4. The ONU waits for the granted time and then transmits the OLT-specified
data volume.
In point 3, the service specifications mentioned here refer to guaranteed min-
imum bandwidth, maximum bandwidth, maximum delay ...
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