Monday, April 25, 2016

Working Principle of Upstream

Working Principles for Upstream Transmission

Figure 1 shows the 10G GPON working principles for upstream transmission.
Figure 1 Working principles for upstream transmission
In the upstream direction, an ONU sends data to the OLT using an allocated timeslot. Such transmission ensures that all ONUs send data in a permitted sequence, which prevents upstream data collision.

Data flow forwarding in the upstream direction

Figure 2 Data flow forwarding in the upstream direction
  • On the ONU, data flows are encapsulated into GEM ports and mapped to transmission containers (T-CONTs).
  • The ONU sends data flows to the OLT according to T-CONTs.
  • The OLT decapsulates the data flows and sends them to service processing modules.
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