VSC6134
Datasheet
2.15.13 Line FEC Regenerator Loopback Modes
There are two Line FEC Regenerator Loopback modes:
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Line Side FEC Regenerator Loopback with Clock Management (with SONET Regen)
Line Side FEC Regenerator Loopback with Clock Management (without SONET Regen)
The following figure shows the Line Side FEC Regenerator Loopback mode. In this mode, LFEC data is
received on the drop side, the signal is framed, decoded and optionally corrected, DWOH performance
monitoring is performed, and the DWOH is terminated or passed through. A synchronously or
asynchronously mapped SONET can be monitored and optionally regenerated. New DWOH is then
inserted as required, and the LFEC parity bytes are recalculated and added. The received drop line
Rxclk is internally looped back to the add Txclk.
Figure 47. SONET Regenerator Mode
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VMDS-10185 Revision 4.0
July 2006
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
