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Fig. 6 — Noise measurements in Nl carrier facilities. 



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dots refer to an estimate (computed from the known properties of the 

 compandor) of what the noise peak levels would have been, had the 

 channel tested been busy with an operating data transmission signal (of 

 the general type illustrated in Fig. 1). Under this condition the com- 

 pandor setting would of course be different from that of an idle channel. 



