80 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1957 



Fig. 11 — Network section. 



section containers. Wiring spaces are machined into the ends of the con- 

 tainers for connecting network leads to the bus tapes. The housing is 

 placed over the container and the buses and is closed by a plastic coupler 

 plate which also forms part of the intersection couplers. The coupler 

 plates are fastened to the housing with plastic pins. 



Between sections the bus tapes are looped toward the longitudinal 

 axis of the repeater unit. The dimensions of the loop are rigidly con- 

 trolled so that as the unit is flexed during bending of the repeater, the 

 loops always return to their original location between sections and do 

 not short to each other or the metal outer container. The bus tapes 

 have either an electrical connection or lock at one end of each section 

 to eliminate any tendency of the tapes to creep as the repeater unit is 

 flexed. 



The buses consist of two copper tapes in parallel to guard against 

 opens should one tape break. The design of the connections to the buses 

 is such that once the section is closed there can be no disturbance of the 

 tapes or network leads in the vicinity of the electrical connections. The 

 bus-type wiring plan was chosen as the best arrangement for the long 

 structure in keeping with the stringent transmission requirements. Elec- 

 trically adjacent but physically remote components can thus be inter- 



