Extended superframe
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In telecommunication, an extended superframe is a T-carrier framing technique in which framing requiring less frequent synchronization than the original T-carrier superframe format is provided for D-4 formatting and for on-line, real-time testing of circuit capability and operating condition.
Note: Less-frequent synchronization frees overhead bits for use in testing and monitoring (http://wiktionary.org/wiki/Transwiki:Monitoring).
Source: from Federal Standard 1037C