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→PHY Adapter Layer (L1.5): control bit is used for more than just L2 (especially with the M-PHY) |
m →PHY Adapter Layer (L1.5): added which protocol layers use the control bit |
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L1.5 thus has its own (conceptual) symbol encoding consisting of 17-bit symbols. These 17-bit symbols never show up on the wiring, because they are first converted by L1.5 to a pair of PHY symbols. The extra 17th control bit indicates special control symbols which are used by the protocol (L1.5 and L2) itself. In the figures, the control bits are shown in "L1.5 red" as a reminder that they are defined in- and used by protocol Layer 1.5.
==Data Link Layer (L2)==
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