Symmetricom TimeProvider 500, Руководство пользователя

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64 TimeProvider 500 2.0 User’s Guide 098-00172-000 Revision A – December, 2009
Chapter 3 Operations
Details for Show Status Function

Correction Freq – shows the current rate correction (in parts per billion: 1E-9)
applied to the synthesizer to provide traceable frequency output.

Phase – shows the current rate correction (in parts per billion: 1E-9) applied to
the synthesizer to provide traceable phase output.

Output MDEV Estimate – uses the reference clock model being developed in
ITU-T SG13 to provide an operational estimate of the output performance of the
TimeProvider 500 in terms of peak MDEV stability.

Residual Phase Error – shows the current estimate of the residual phase error
in ns. This error compensation is reflected in the phase value.

Minimal RTD – shows the minimal round-trip delay value. In steady state, this is
estimated over the cluster window time of nominally 1 minute.

Temperature Avg – shows the average temperature over five minutes.

Temperature Min – shows the minimum temperature over five minutes.

Temperature Max – shows the maximum temperature over five minutes.

Temperature 5min – standard deviation of five-minute average temperature
data.

Temperature 60min – standard deviation of 60-minute average temperature
data.

Flow Direction –shows two separate columns for flow direction; (GM to client)
and (client to GM). Identifies whether the values shown are for the flow direction
from the grandmaster to the client or from the client to the grandmaster.

GM1 – shows the number of sync packets being received from the Grandmaster
GM1 in the first column and the number of delay response packets being
received from the GrandMaster GM1 in the second column. Since the default
packet rate setting for the TimeProvider 500 is 64 Sync Packets/second, the
grandmaster flow is good in
Figure 3-6 .

GM2 – shows the number of sync packets being received from the grandmaster
GM2 in the first column and the number of delay response packets being
received from the GrandMaster GM2 in the second column. The values for GM2
are 0, as expected, since GM1 is being used for the PTP flow. See
Figure 3-6 .

Weight – indicates the percentage contribution of the forward flow sync packets
being used to drive the TimeProvider 500 outputs. The remaining percentage is
being taken from reverse flow (Delay_resp packets).

Transient Free – values are rolling 15 minute (900 s) and 1 hour (3600 s)
metrics. Transients include loss of sync flow, phase steps, and pops against both
dynamic and static thresholds. If a given second includes a transient, it is not
considered “transient free.” Generally, if 80% or more of the indicated times (900
or 3600 seconds) are transient free, transient packet behavior should not be
causing output performance issues.

Percentile Clustering – indicates the percentage of sync packets that meet all
clustering criteria and are therefore included in extracting the clock offset
estimates.