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100BASE-T4 specifies a ternary symbol error rate of less than one part in 10^8. My recollection is that we didn't feel compelled to do any better than 10BASE-T, which has a BER objective of less than one part in 10^8. I also recall that the BER objective for FDDI-TPPMD and 100BASE-TX is 2.5 x 10^-10. We had the same BER objectives on fiber and copper. Gigabit Ethernet specified 10^-12 because that's what Fibre Channel claimed. Howard Frazier Cisco Systems, Inc.