SYSTEM DESIGN 



NEWFOUNDLAND-NOVA SCOTIA LINK 



223 



^ 0.0041 



o 



o 

 o 



.^ 



LU 

 CL 



(/) 



_l 



LU 

 $ 

 U 

 LU 

 Q 



z 

 g 



< 



D 

 Z 

 LU 



0.0040 



0.0039 



20 



50 



100 

 FREQUENCY 



200 300 400 



IN KILOCYCLES PER SECOND 



500 



640 



Fig. 4 — Cable attentuation characteristics — Skj-e trials, (a) Characteristic 

 originally assumed. (6) Characteristic measured in factory tank (flooded), (f) 

 Characteristic measured in ship's tank (flooded), (c?) Characteristic measured 

 after laying. 



per deg C and that the true pressure coefficient of attenuation was 

 negligible at the depths involved. 



DESCRIPTION OF SYSTEM 



Circuit Provision and Frequency Allocation 



It was originally thought that a design similar to that of the Aber- 

 deen-Bergen system would be suitable for the Clarenville-Sydney Mines 

 route in that it Avould provide more circuits (36) than the long section 

 across the Atlantic. This potential excess capacity, which was required 

 for circuits between Newfoundland and the Canadian mainland, dis- 

 appeared when it was found that 36 circuits could, in fact, be provided 

 over the longer link. The Aberdeen -Bergen design was therefore modi- 

 fied to provide a complete supergroup of 60 circuits, the same capacity 

 as the earlier British projects.^ The system thus requires broad-band 

 transmission of 240 kc in each direction. 



In the earlier British projects the frequency bands transmitted are 

 24-264 and 312-552 kc, but for the present purpose the lower band is 



