> -----Original Message-----
> From: Richard Cochran [mailto:richardcoch...@gmail.com]
> Sent: Thursday, November 12, 2020 10:45 AM
> To: pavan-lakote
> Cc: linuxptp-users@lists.sourceforge.net
> Subject: Re: [Linuxptp-users] switchover fails when having multiple
unicast
> master
>
> On Thu, Nov 12, 2020 at 10:12:49AM +0800, pavan-lakote wrote:
> > If you have observed, when clock is "free_running" the clock servo state
> > always remains in "SERVO_UNLOCKED" this causes the port to always
> remain in
> > "UNCALIBRATED" state.
>
> Oh, I didn't see that you had free_running=1
>
> > So when unicast master was changed the port was in "UNCALIBRATED"
> state. As
> > the previous and new port state is same, "port_state_update()" never
> trigger
> > "unicast_client_state_changed()".
>
> Now it makes sense.
>
> > Is "free_running" clock meant to be "SERVO_UNLOCKED" always?
>
> Yes, in this mode, the program never adjusts the clock.
Get it, but " clock_no_adjust" reply clock servo state based on variable "
local_sync_uncertain" which is default set to " SYNC_UNCERTAIN_DONTCARE".
>
> Why don't you want to synchronize the local clock?
We do synchronize the clock but using our own clock servo algorithm.
That's the reason we wanted to run ptp4l as free running clock.
Is there anything I'm missing here to understand?
>
> > What is major difference between "free_running" and clock servo "
nullf"?
>
> The nullf is meant for SyncE (Synchronous Ethernet).
>
> When running with Synchronous Ethernet , the correct clock frequency
> is provided by the link partner. In this case, only the offset needs
> correcting.
>
> HTH,
>
> Richard
Loop Telecommunication International
Loop-V4150
DS0 Cross Connect Multiplexer supports up to 504E1/672T1 worth of DS0
non-blocking cross connect matrix. The V4150 DS0 Cross Connect System can
provide users with the high-density capacity up to 504 E1/T1, 24 T3MX3, or 8
STM-1 (OC-3). All interfaces are fully compliant for use with the relevant ETSI
standards and ITU recommendations. In addition, Loop-V4150 with E1/T1 cards,
through the protection relay shelf, is able to perform 1+1, 1:N and 1:1
redundancy switching to ensure the high-availability circuit system.
For further arrangement and more information, please contact Loop Telecom.
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