816 



THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1953 



Table IV — Summary of High-Frequency Line Equipment 

 AT Repeater Stations 



Line amplifier 



Flat amplifier 



Auxiliary or thermometer regulator. . . . 

 Manual equalization (Number of terms) 



Automatic equalizers 



Regulators for equalization (kc) 



Design deviation equalizer 



Auxiliary 



Equal- 

 izing 

 Aux. 



1 



2 



10 



3 



7266 



308 



2064 



Auxil- 

 iary 

 Main 



1 



2 



10 



3 



7266 



308 



2064 



Switching Switching 



The functions of the fixed, manual and pilot controlled equalizers 

 are noted in Section 2.22 of this paper and discussed in detail in the 

 companion equalization paper. 



3.32 Equalizing Auxiliary Repeaters 



This type of repeater will be found after a maximum of thirty-two 

 auxiliary repeaters provided power feed to the cable, dropping, or 

 switching is not required (Refer to Fig. 14). The major components 

 provided are covered in Table IV. In addition to these items, power 

 separation filters, basic equalizers and artificial lines identical with those 

 in auxiliary repeaters are used. A pilot alarm unit is also included to 

 monitor each of the three regulators and transmit an alarm when any 

 one of the controlling pilots has deviated beyond a given limit. 



Power for these repeaters is obtained from the cable just as in the 

 case of the auxiliary repeater and much of the same type of equipment 

 is used. However, due to the larger amount of power required and the 

 layout of the repeater the auxiliary repeater power units have been re- 

 packaged to provide the optimum arrangements for leads carrying high 

 current or critical bias supply circuits. 



The design of panels used in this repeater was dictated by the general 

 scheme conceived for the switching main repeater where the maximum 

 amount of equipment is required. This arrangement involves the use 

 of both sides of a duct-type frame. A single panel (again called the trans- 

 mission panel) is used, but an amplifier is mounted on one side and a 



