Digital information transferred across the functional
interface between a
user and a telecommunications
system, or between functional units within a telecommunications system, for the purpose of directing or controlling the
transfer of
user information or the
detection and correction of errors. (
188 ) Note: Overhead information originated by the user is not considered to be system overhead information. Overhead information generated within the
communications system and not delivered to the user is system overhead information. Thus, the user
throughput is reduced by both overheads while system throughput is reduced only by system overhead.
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