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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APHY