| Definition: | a specified combination of a sending system and a receiving system, with associated subscriber's telephone lines and feeding bridges or equivalent systems, connected by means of a distortionless variable attenuator, and employed under specified conditions to determine by comparison some aspects of the transmission performance of other telephone systems or parts
of systems
NOTE – A working standard may be used for determining reference equivalents of a telephone complete connection in a given direction, sending reference equivalents and receiving reference equivalents.
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