258 



THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1956 



49 

 LINES 



TEN GROUPS 

 OF LINES 



49 



LINES I 



CENTRAL OFFICE 

 LINE LINK FRAME 



LINE SW 



I 



TO MARKER 



TRUNK 

 LINK 

 FRAME 



Fig. 5(a) — No. 5 crossbar system subscriber lines connected to line link frame. 



60 



LINES 



60 

 LINES 



60 

 <? 



10 



CONTROL 



CE^4TRAL OFFICE 



TEN CONCENTRATOR 

 , TRUNKS 



I 



JL 



TWO CONTROL PAIRS 



60 







10 



TEN POLE- 

 MOUNTED 

 ^CONCENTRATOR 

 UNITS AT 

 DIFFERENT 

 LOCATIONS 



CONTROL 



TEN CONCENTRATOR 

 TRUNKS 



TWO CONTROL PAIRS 



CONCENTRATOR 



TRUNK SW JUNCTOR 



SW 



10 

 9 C> 



TRUNK 



LINK 

 FRAME 



TO MARKER 



CONCENTRATOR LINE LINK 

 FRAME 



Fig. 5(b) — No. 5 crossbar system subscriber lines connected to remote line 

 concentrators. 



