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BELL SYSTEM TECHNICAL JOURNAL 



for efficiency in the design of the equipment. These requirements 

 have been mainly (1) compactness in dimensions (2) uniformity in 

 assembly arrangements and (3) simplicity in design. 



To make possible the housing of the equipment for a cable installa- 

 tion within a building of reasonable dimensions, it has been neces- 

 sary to economize carefully in space. Fig. 28 shows in a general 



Fig. 28 — General View Showing Typical Group of Equipment Units Employing 



Panel Mounting Method 



way how the panel assembly method may be employed to accomplish 

 this. As seen from this view, the equipment panels are assembled 

 on vertical supports consisting of I-beams or channels which extend 

 from the floor to the ceiling, rolling ladders being employed to reach 

 the apparatus above when necessary. As has been shown in the 

 preceding views of individual equipment units, all of the adjustable 

 apparatus is mounted on the front of each equipment panel and the 



