VSC6134
Datasheet
2.15.7
StFEC(S) <-SONET(Regen) <-Async-> LFEC(S)
The following figure shows the FEC Bridge or Regenerator mode with on-chip SONET regeneration
and asynchronous remapping. In the add direction, the StFEC signal is framed, decoded, and optionally
corrected; DWOH performance monitoring is performed; and the DWOH is terminated (DWOH cannot
be passed through). The synchronously mapped SONET signal is monitored, regenerated, and
asynchronously remapped. New DWOH is then inserted, and the LFEC parity bytes are recalculated and
added.
In the drop direction, the LFEC signal is framed, decoded, and optionally corrected; the payload is
asynchronously demapped; DWOH performance monitoring is performed; and the DWOH is
terminated (DWOH cannot be passed through). The asynchronously mapped SONET payload is
demapped, monitored, and regenerated; the payload is synchronously mapped; new DWOH is then
inserted; and the StFEC parity bytes are optionally recalculated and added. This mode supports the
optional extraction of the OTU stuff bytes received in the add and drop directions and the insertion of
the OTU stuff bytes transmitted in the add and drop directions.
Figure 41. StFEC to LFEC Bridge with SONET Regeneration and Asynchronous Remapping Mode
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VMDS-10185 Revision 4.0
July 2006