October 2007
Intermediate to advanced
368 pages
10h 55m
English
Content preview from Passive Optical Networks
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2.6.4.2.1.2 GTC Upstream Framing
The GTC upstream transmission consists of upstream virtual frames of
125-ms duration as shown in Fig. 2.23. Upstream virtual frames are made up
of bursts from different ONTs. Each burst starts with a physical layer overhead
upstream (PLOu).
The PLOu begins with a preamble to help the burst mode receiver at the OLT
to synchronize with the ONT (Fig. 2.24) transmitter. A delimiter following the
preamble signifies the beginning of an upstream burst. As in APON, the length
and format of preamble and delimiter are specified by the OLT using down-
stream PLOAM messages. An indication field (Ind) in PLOu provides real-time
ONU ...
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