pciaccio Wed, 02/27/2008 - 04:56
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The encapsulating starts from layer 4 to layer 2. Layer 4 is called a segment. Layer 3 is called a Packet and LAyer 2 is called a Frame. The other layers are just processes that are performed on the data. Data Encoding /decoding and CRC error checking is performed from LAyer 7 to layer 4, then the encapsulations occur. Layer 2 to layer 1 is more a modulation scheme that takes the digitized data (Frame) and modulates it and shapes it to be placed out on the wire (media). That layer handles the Electrical/ Mechanical and functional standards for the media... Hope this helps...

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