THROWDOWN MACHINE FOR TRAFFIC STUDIES 



357 



0.4 

 0.3 



0.1 

 0.08 



UJ 



f^ 0.04 



0.03 



^ 0.02 



0.01 

 0.008 



0.006 



0.004 

 0.003 



0.002 



Fig. 27 — Dial tone service w 

 by the throwdown machine. 



1.6 2.0 2.4 Iq 2.8 3.2 3.6^^ 4.0 



TIME,T, IN SECONDS 



ith different equipment quantities as determined 



100 per cent load. In succeeding runs, an overload of varying amounts 

 was utilized. In the several runs, the quantities of registers and markers 

 were varied to obtain basic engineering data. 



As the No. 5 system was originally engineered, the preference order 

 in which markers were assigned by the gate control circuit to marker 

 connectors during heavy loads was as follows: (1) line link frame marker 

 connectors; (2) originating register marker connectors; (3) incoming 

 register marker connectors. At a later date, this order was changed to 

 put the line link frame marker connectors last in preference. In the dis- 

 cussion which follows, this arrangement will be known as "reversed 

 preference." 



