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Ethernet Frame Corruption Matrix |
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Collisions |
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<64 bytes, with Jam (4 to 12 bytes of AA or 55) appended |
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Sniffer flags as Runt or Alignment or Collision |
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Excessive Propagation Delay |
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Also known as Late Collision |
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>64 bytes, with Jam (4 to 12 bytes of AA or 55) appended |
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Sniffer flags as Collision after 64 bytes |
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Hardware failure |
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Frame size can vary between normal and too long (>1518 bytes) |
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Appended to the end of the frame will be an excessive amount (>64 bytes) of Jam |
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New Sniffers will label this excessive Jam as Jabber |
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Excessive Jabber can lead to an Oversize frame (>1548 bytes) |
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| Half-duplex and full-duplex mismatches will cause Jabbers leading to Oversize frames. | |
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Electrical noise |
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Frame size is normal as specified in the 802.3 Length or IP Total Length fields. |
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| At least one bit in the frame has changed | |
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No Jam is appended to the end of the frame |
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Sniffer flags as CRC Error |
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| With any of these problems present, users will see decreased performance due to retransmissions | |