The following specifications apply to the standard networks defined in GR-499-CORE, Issue 3.
For systems interfacing at the DS1 rate, the number of errored seconds during a 7-hour, one-way loopback test, is less than 10.
For systems interfacing at the DS3 rate, the number of errored seconds during a 2-hour, one-way loopback test, is less than 29.
The BER is less than 2x10−10 for both the DS1 and DS3 rates. Burst-errored seconds are excluded.
The frequency of burst-errored seconds, other than those caused by protection switching induced by hard equipment failures, averages less than 4 per day.
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