600 



BELL SYSTEM TECHNICAL JOURNAL 



2800 

 2700 

 2600 

 2500 

 2400 

 2300 

 2200 

 2100 

 2000 

 1900 

 1800 

 1700 



Fig. 7- 



1200 1600 2000 2400 



FREQUENCY IN CYCLES PER SECOND 



-Resistance component of impedance. 30.8 mile circuit, 19 CNB-B135. 

 Termination, 113 t^^pe network. 



2^ 



DO 



o z 

 uj ai 

 a u 



z a 



- lU 



1/1 Q. 



800 1200 1600 2000 2400 



FREQUENCY IN CYCLES PER SECOND 



Fig. 8 — Return loss — -frequency characteristics. Measured on 61 circuits 30.8 

 miles long. Building-out condenser adjusted on each circuit for optimum return loss 

 in the frequency range 2600, 2700 and 2800 cycles. Curve ' A' \s the 63 per cent 

 return loss computed from attenuation and irregularity function measured on cable. 



