A-PHY layer has the following features and functions:

  • Unified structure to reduce complexity
  • Shared 8B/10B Physical Coding Sublayer (PCS) for speed Gear 1 and 2 and uplink channel.
  • Retransmission (RTS) sublayer (local retransmission mechanism):
    • Manage data packing and buffering
    • Assign message counter (MC) and CRC (Cyclic Redundancy Check)
    • In Profile 2: the retransmission process for A-Packets that are erroneous or that are not received
  • Physical Coding Sublayer (PCS):
    • Specifies the conversion of Data Link Layer A-Packets into PHY symbols
    • In Profile 2, PCS also handles the Just In Time Canceller (JITC) retraining
  • Physical Media Dependent (PMD) sublayer:
    • Defines the electrical specifications and the physical medium

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