N-1 CARRIER TELEPHONE SYSTEM 



433 



along the cable route or shipping of units to and from a maintenance center, 

 small light-weight fibre carrying cases are available. 



To facilitate manufacture, the equipment units are subdivided into two 

 or more subassemblies. The circuit is divided among these subassembUes 

 in a way that is convenient for shop assembly and test. An additional ad- 

 vantage, in stocking for maintenance, is that certain of these subassemblies 

 are common to several equipment units, thus reducing the investment in 

 spare units. When the subassemblies are separated, the apparatus and as- 

 sociated wiring in each are readily accessible. Electrical connections between 



Fig. 10— Thermoplastic strips being positioned in assembly jig for pigtail components. 

 The strips are precut to length from extruded "ribbons" and are stamped with equipment 

 designations to identify the components. 



subassembUes are accompUshed by means of the same type of male and 

 female connectors as are used between the complete unit and its frame 

 mounting. For protection, particularly in handling, a slip-on can cover is 

 provided for each equipment unit. 



Mounting or Components 

 To meet the objective of low manufacturing costs, a simple and effective 

 method of mounting the large number of pigtail components is essential. 

 The method adopted arranges as many of these components as electrical 

 requirements permit, on two parallel thermoplastic strips which in turn 

 are mounted in the chassis. Sunple assembly jigs, an example of which is 

 shown in Fig. 10, position the strips and components so that the terminal 



