BER performance on fiber links

["A.B. Jr." <skandor () gmail com>]

Hi all,

What is the bit error rate that can be expected from a  modern hi capacity
mostly optical point to point circuits ?

10 E-7 would be too conservative or too agressive?

What if the "circuit" is in fact Ethernet LAN to LAN transport? How many
frames can one expect to be discarded due to link errors?

Thank you in advance.

A.B.