The severity of a high-bit error rate can vary and cause
any of the following symptoms:
- Failure to complete auto-negotiation when auto-negotiation is enabled.
- Failure to obtain a link when auto-negotiation is disabled in both the core and the link partner.
- High proportion of lost packets when passed between two connected devices that are capable of obtaining a link through auto-negotiation or otherwise. This can usually be accurately measured if the Ethernet MAC attached to the core contains statistic counters.
Note: All bit errors detected by the 1000BASE-X
or 2500BASE-X PCS/PMA logic during frame reception show up as Frame Check Sequence
Errors in an attached Ethernet MAC.