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Re: Long distance links

Jonathan Thatcher wrote:

> Paul. Thank you!
> -------------- from Paul --------------------------
> To carry Ethernet frames on a SONET system:
> 1)Ethernet must match the payload rate of 9.584640 Gbps
> 2)Ethernet frames must be encoded with NRZ efficiency

The interface to SONET(i.e., SONET PHY) will be MII, which is before the
Ethernet PHY (line coding) is done. Therefore, the Ethernet frame at MII to
SONET PHY should be inherently NRZ-efficient independently of the Ethernet line
code and the resulting Ethernet line rate.

> 3)Ethernet frame delimiting must operate without special symbols
> ------------ end from Paul ------------------------


Dae Young