TRANSATLANTIC TELEPHONE CABLE — AFFEL 289 



Clarenville and the frequency band 312 to 552 kilocycles per second 

 in the reverse direction. The cable will therefore provide 60 carrier 

 telephone circuits with channels spaced 4 kilocycles apart. One of two 

 12-channel groups in each direction not employed for transatlantic 

 service will be used to provide 12 circuits for "local" telephone circuits 

 between Newfoundland and the rest of Canada ; the other will be held 

 spare for the present. 



The junction point between the eastward and westward parts of the 

 system at Clarenville will be in effect a group connector. The trans- 

 atlantic channels in both parts will appear here as primary groups 

 in the frequency range 60 to 108 kilocj^cles per second. Conneci ion will 

 also be made here to the local and spare groups. Equipment to bring 

 each of the 12 channels in any one transatlantic group down to ordi- 

 nary speech frequencies will be installed but not normally connected. 

 Availability of such equipment is desirable for testing purposes. 



The traffic operating terminals will be in London, New York, and 

 Montreal. Twenty-nine telephone circuits will be put into service 

 between London and New York and six between London and Montreal. 

 It is planned to split the thirty-sixth telephone circuit at the western 

 end between New York and Montreal and use it for other purposes. 



Telephone and telegraph circuits for maintenance purposes will be 

 provided between Oban and Clarenville in the frequency band below 

 20 kilocycles per second, as indicated in figure 5. Between Clarenville 

 and Sydney Mines, telephone service circuits will be provided in the 

 "crossover" frequency band between 260 and 312 kilocycles per second 

 and telegraph service circuits below 20 kilocycles per second in one 

 direction and 552 kilocycles in the other direction. 



TRANSMISSION OBJECTIVES 



Since the transatlantic circuits will serve to connect two extensive 

 telephone networks on opposite sides of the ocean, including connection 

 to the European continent, which will be reached through London, 

 they are being designed to cause as little extra loss and other forms of 

 impairment as possible. For example, it has been agi-eed that the 

 target for frequency characteristics of the channels between London 

 and New York or London and Tdontieal should be as good as that 

 specified by the C. C. I. T.* for a 2,500-kilometer international circuit. 



Other objectives for the circuits compare favorably with those speci- 

 fied for long-distance circuits wholly on land. 



CABLE DETAILS 



As already indicated, two cables will be used between Newfoundland 

 and Scotland, one for each direction of transmission. The cable used 



* Comit6 Consultatif International Telephonique. 



