| Definition: | the loss expressed in decibels, constant at all frequencies transmitted which it is necessary to add to, or remove from, a specified telephone reference system, so as to obtain the same transmission performance in a given direction, when a system to be assessed is added to, or used to replace the whole or appropriate part of the reference system
NOTE – The transmission performance rating is positive or negative according to whether it has been necessary to add or remove the corresponding loss.
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