| Definition: | a digital signal having a digit rate standardized by CCITT, primarily for use in the standardized digital multiplex hierarchy
NOTE 1 – A standardized digital signal may or may not be a multiplexed assembly of standardized digital signals from a lower hierarchical level.
NOTE 2 – Examples of such signals are "standardized 2 048 kbit/s digital signal" and "standardized 44 736 kbit/s digital signal", which may be abbreviated to "2 048 kbit/s digital signal" and "44 736 kbit/s digital signal" or, by convention, to "2 Mbit/s signal" and "45 Mbit/s signal".
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