VSC8540

 VSC8540-04 also includes Fast Link Failure 2.0 indication for high availability networks. As in the original FLF feature on previous generation PHYs, FLF 2.0 indicator identifies the onset of a link failure in less than 1 ms typical (using the default values), which goes beyond the IEEE 802.3 standard requirement of 750 ms ±10 ms (link master). FLF2 goes beyond the previous FLF indicator by adjusting the programmable threshold for applications where indication of even a potential link drop must be known at the microsecond level (<10 μs