The 2500Base-X standard does NOT allow such "short" preambles. Now 2.5G SGMII seems to be "fast SGMII", which means that the MAC believes it is ok to shorten the preamble. However, 2500Base-X does not allow short preambles. In my case some packets had 7 bytes and some had 6 ...
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The 2500Base-X standard does NOT allow such "short" preambles. Now 2.5G SGMII seems to be "fast SGMII", which means that the MAC believes it is ok to shorten the preamble. However, 2500Base-X does not allow short preambles. In my case some packets had 7 bytes and some had 6 ...
(all 0x55) and a 1 byte Start Frame Delimiter (SFD, 0xd5). For 1000Base-X (and maybe other cases) the preamble is allowed to be only 6 bytes in length. AFAIK it is shortened to support 16-bit alignment on the PCS level. The 2500Base-X standard does NOT allow such ...