Visible to Intel only — GUID: ewo1451940943103
Ixiasoft
Visible to Intel only — GUID: ewo1451940943103
Ixiasoft
4.1.1.2. Preamble Insertion
In the TX datapath the MAC prepends an eight-byte preamble to the client frame. If you turn on Enable link fault generation , this MAC module also incorporates the functions of the reconciliation sublayer (RS).
The source of the 7-byte preamble (including a Start byte) and 1-byte SFD depends on whether you turn on Enable preamble passthrough in the parameter editor.
Note that a single parameter in the Low Latency 40G for ASIC Proto Ethernet parameter editor turns on both RX and TX preamble passthrough.