Tlil.l-.riKKM: //v-./.V,V.\//\S7().V M.IIM I.X.I.W i: .t') 



ill local iiuiiiKriiaiicf work and a liiv;li iiii|H-(laii( r lioldiiiK coil art- 

 also roiiiU'cliMl lo till- trunks tliroii);li tin- iiHMsitriii)^ set, iIk-m- U-inn 

 iist'd to i-stal)iis!i till- loop and hold this loop while ihi' tests ari' ni.idr. 

 At otlice B two spare multiple cimiits are iro>s-(oniiefted at the main 

 distrilmtini; frame. An\ two trunks in ilie ^rouj) can then lie aiiio- 



Apparatus 



(l ) Arr'w>gcment t>iowina method of making overall Trans miss ton Taste 

 on Trunk* between Two Panel Machine "Switching Offices 



1 TrantmiMion Circu't 



St 



a 



E 



J:® 



Trunks Incoming To Office B 



Stfeetor Selector Connecter 



s3" 



ig- 



:7 



Apparatus in TraoimiMion Circuit @ Apparatus in Tran^r-ititon Circuit 



(2) Arrangement showing method ofmaldrg overall Transmission Tests 

 cnTrunVs betwern Two Step by Step Machine Switching Offices 



Kig. 9 — Schematic Diagrams Showing Metho<ls of Making Transmission Tests on 



(Ai Trunks Between Panel Machine Switching Ofiices and (Bl Between Step by 



Step Machine Switching Offices 



matically looped together at office B by the use of the selector test 

 set which functions to connect the trunks to the two sjiare miihiple 

 circuits previously cross-connected at office B. 



In step-by-step machine switching offices the circuits involving 

 transmission equipment corresponding lo cord circuits are the con- 

 nectors. Kach connector is provided with a test jack through which 

 connection can be made to a transmission measuring set and the 



