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RE: Local Fault/Remote Fault


If the PHY XGXS cannot get lock on the signal it is receiving from the DTE
XGXS, it will send Local Fault on its transmit output (to the PMA). Local
Fault always travels on in place of the signal that cannot be recovered. 


-----Original Message-----
From: Boaz Shahar [mailto:boazs@xxxxxxxxxxxx]
Sent: Sunday, December 31, 2000 1:43 AM
To: 'Stephen.Finch@xxxxxx'; stds-802-3-hssg@xxxxxxxx
Subject: RE: Local Fault/Remote Fault

Some comments/questions:

> 1.  Any device, in either its transmit or receive paths, could
>     detect a fault condition.  The fault may be that the data
>     being received is invalid or that some internal problem
>     is causing the problem.  Some/many faults may go
>     undetected.  If a device detects a fault condition (i.e.,
>     a locally detected fault) it should set its link status
>     to zero and not forward what is received, but should,
>     at its output, either:
>   a.  generate a local fault pulse ordered set if it is
>       capable of doing so,

If, for instance, in the system: RS -  DTE XGXS - (XAUI) - PHY XGXS - PCS -
PMA - PMD a local fault is detected by the local  PCS by recognizing that
the XAUI lanes (In the Transmit path)  are not de skewed. Then the intention
is that a LF indication will be signaled to the local RS via the RX path?
(That is, the PCS will have a connection from the Transmit path to the
receive path?)