SONET  LAYERS

There are 3 layers that control the transport functions in the SONET frame.  The first layer is the Section layer that moves data across the media (OSI - 1).  The second layer is the Line layer which maps the payload into the electrical  STS  signal to send to the peer terminating network elements (OSI - 2).  The third layer is the Path layer which maps sevices into the preliminary payload prior to STS framing. (OSI - 3).

BACK