23.4. Using the PTP Management Client

The PTP management client, pmc, can be used to obtain additional information from ptp4l as follows:

pmc -u -b 0 'GET CURRENT_DATA_SET'

~]# pmc -u -b 0 'GET CURRENT_DATA_SET'
sending: GET CURRENT_DATA_SET
        90e2ba.fffe.20c7f8-0 seq 0 RESPONSE MANAGMENT CURRENT_DATA_SET
                stepsRemoved        1
                offsetFromMaster  -142.0
                meanPathDelay     9310.0

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pmc -u -b 0 'GET TIME_STATUS_NP'

~]# pmc -u -b 0 'GET TIME_STATUS_NP'
sending: GET TIME_STATUS_NP
        90e2ba.fffe.20c7f8-0 seq 0 RESPONSE MANAGMENT TIME_STATUS_NP
                master_offset              310
                ingress_time               1361545089345029441
                cumulativeScaledRateOffset   +1.000000000
                scaledLastGmPhaseChange    0
                gmTimeBaseIndicator        0
                lastGmPhaseChange          0x0000'0000000000000000.0000
                gmPresent                  true
                gmIdentity                 00a069.fffe.0b552d

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Setting the -b option to zero limits the boundary to the locally running ptp4l instance. A larger boundary value will retrieve the information also from PTP nodes further from the local clock. The retrievable information includes:

stepsRemoved is the number of communication paths to the grandmaster clock.
offsetFromMaster and master_offset is the last measured offset of the clock from the master in nanoseconds.
meanPathDelay is the estimated delay of the synchronization messages sent from the master in nanoseconds.
if gmPresent is true, the PTP clock is synchronized to a master, the local clock is not the grandmaster clock.
gmIdentity is the grandmaster's identity.

For a full list of pmc commands, type the following as root:

pmc help

~]# pmc help

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Additional information is available in the pmc(8) man page.

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23.4. Using the PTP Management Client

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