On Fri, Nov 19, 2021 at 03:16:49AM -0800, Methlal Pallewatta wrote:
> In the section 6.6.4 (page 35) of the IEEE Std 1588-2008 the following is
> stated about the port 2 in the P2P mode.
>
> Port-2 either:
> 1. returns the difference between the timestamps t2 and t3 in the
> Pdelay_Resp message
> 2. returns the difference between the timestamps t2 and t3 in a
> Pdelay_Resp_Follow_Up message
> 3. returns the timestamps t2 and t3 in the Pdelay_Resp and
> Pdelay_Resp_Follow_Up messages,
> respectively
Yes, but actually, the exact steps are spelled out starting on page 114:
11.4.3 Peer delay mechanism operational specifications
> I found that the IXIA master that I used was using option 2 and was not
> sending the actual timestamp t2 but sending out 0 instead.
The action of the "delay requestor" is the same in any case, and this
is spelled out starting on page 115:
1) Generate timestamp t4 upon receipt of the Pdelay_Resp message
2) If asymmetry corrections are required, modify the
correctionField of the Pdelay_Resp message per 11.6.5
3) If the twoStepFlag of the received Pdelay_Resp message is FALSE,
indicating that no
Pdelay_Resp_Follow_Up message will be received, compute the
<meanPathDelay> as:
<meanPathDelay> = [(t4 - t1) - correctionField of Pdelay_Resp]/2
4) If the twoStepFlag of the received Pdelay_Resp message is TRUE
indicating that a
Pdelay_Resp_Follow_Up will be received, compute the <meanPathDelay> as
follows:
<meanPathDelay> = [(t4 - t1) - (responseOriginTimestamp -
requestReceiptTimestamp) -
correctionField of Pdelay_Resp - correctionField of
Pdelay_Resp_Follow_Up]/2
Which part of that is linuxptp doing incorrectly?
> At the same time
> the Syncs were the actual timestamp as the originTimestamp.
How are Sync messages relevant here?
Thanks,
Richard
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