Time-Synchronization Blackout

ION 7500 / ION 7600 User’s Guide	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.

55	58m45s	1m15s	5
55	56m15s	3m45s
	56m15s	3m45s
53m45s			6m15s
			6m15s
51m15s			8m45s
50			8m45s
50			10
			10
48m45s			11m15s
46m15s			13m45s
45			15
43m45s			16m15s
			16m15s
41m15s			18m45s
			18m45s
40 38m45s			20
			21m15s
36m15s		23m45s

35 33m45s 31m15s 28m45s26m15s 25

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.

Time Synchronization & Timekeeping Technical Note

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7500, 7600 specifications

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Multi-Tech Systems 7500, 7600 Time-Synchronization Blackout, Changing Default Blackout Settings

Models: 7500 7600

ION 7500 / ION 7600 User’s Guide