Multi-Tech Systems 7500 - Manual (Page 357)

ION 7500 / ION 7600 User’s Guide Time-Synchronization Blackout
Time Synchronization & Timekeeping Technical Note Page 357
Time-Synchronization Blackout
Time-synchronization blackout is defined as a duration when time
synchronization cannot occur. Utilities often record power usage at regular,
predetermined intervals. For example, the utility may schedule a recording every
five minutes during an hour period (i.e. 5, 10, 15, 20,..., 55, 60). If a time synch
moves the meter clock forward, the meter may miss one of the recording intervals.
If a time synch moves the meter clock backwards, the meter may get two records
with the same timestamp. The time synchronization blackout feature seeks to
protect the time before and after these recording intervals by not sending out any
time synch signals at those times.
ION Enterprise has time-synchronization blackouts enabled automatically. The
blackout intervals are every five minutes as follows: 0, 5, 10, 15, 20, 25, 30, 35, 40,
45, 50, 55. Each blackout is 2 minutes and 30 seconds in duration. This duration is
distributed evenly before and after the interval. The diagram below illustrates the
time synchronization blackout feature in ION Enterprise.
If a regularly scheduled time synch is not sent due to a blackout interval, the
software continues trying to send the time synchronization signal every 15 seconds
until the blackout period expires and the time synch is sent.
Changing Default Blackout Settings
In order to change the default settings for the interval or the blackout duration, you
must edit the registry.
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58m45s
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