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Re: [802.3ae] PMA Loopback

Hello Burt,

No this mode is not defined. Though useful as another diagnostic in a
link when the link is suspect,
I believe that the signal detect serves this function well enough.
Putting a 10Gb/s retimer from the
PMD recv to the PMD tx is not necessary.


Burt Christian wrote:

> Hi,
> According to the PMA loopback definition in [] and [51.8],
> the PMA shall accept data on the transmit path and return it on the
> receive path.
> Another useful PMA loopback mode would be one where the input
> from the PMD service interface would be retimed and returned on
> the transmit path.
> Is this mode defined ? If not, why not ?
> Thank you.
> Burt S, Christian.
> Ceyba Inc.,
> Systems Specialist
> Tel : (613)599-5797
> Fax : (613)599-1247
> burt@xxxxxxxxx