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View the check-in history and NTP accuracy of a Bell Controller

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A Bell Controller accuracy log is a summary of its check-in history and drift and NTP accuracy. This data may be beneficial when troubleshooting the time accuracy of the ringing of your bell schedules.

  1. Go to Devices > Bell Controller Relays.

  2. From the list, select the 12-character Gateway link of the Bell Controller Relay. The relay's gateway profile is displayed.

  3. From the Accuracy Log, select View.

    bell-accuracy-log.png

    The below table provides the details of the data displayed.

    Column

    Definition

    Date/Time

    Date and time the device last checked-in to OneVue.

    Gateway ID

    Gateway ID (MAC address) of the device. Selecting the link opens the gateway profile.

    Drift (sec)

    The number of seconds of free running time drift that occurred between the last time synchronization with an NTP Server.

    Free running time drift is how many seconds the internal time keeping drifted off from its last time sync (check-in) with a NTP Server. As an example, if a device checks-in once a day at the same time every day and the drift is 0.35 seconds, this indicates in the last 24 hours the device drifted 0.35 seconds or 1.46 milliseconds per hour from its last NTP time sync.

    • A drift less than a one second per day is normal. More than one second may indicate a hardware problem. Devices often drift differently depending on their quality, battery power, and surrounding temperature and other environmental variables. Thus, the same device can have different drift rates at different occasions.

    • Unavailable indicates during its connection to a NTP Server, it failed to obtain time or was invalid.

    NTP Accuracy (sec)

    The Accuracy Log details the accuracy of the NTP time received during each check-in. The accuracy value takes into account the internal time accuracy of the NTP Server, as well as any network delays. This information can also be used to review the check-in history of a device.

    Using an internal Stratum 1 time server gives the lowest, best time accuracy possible.

    External Servers or servers that are not properly synchronized to a time reference typically yield higher less accurate values.

    • Less than 200ms is normal. If greater than 200ms the use of an internal NTP Server is recommended.

    • Unavailable indicates during its connection to a NTP Server, it failed to obtain time or was invalid.

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