348 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1953 



fusion. Following the simple numerical order of release times, the opera- 

 tor sets up the next release time on the holding time detector, similar to 

 the time detectors at the originating position, which stops the system and 

 signals when that time arrives. The operator returns the held items hsted 

 in that 100-block to normal, crosses out the block and sets up the next 

 following time on the detector. 



False start and register overflow release time entries are made in the 

 same holding time book. A jack array is provided to hold the register 

 peg until release time under these conditions. 



Since the longest holding time is six minutes (100,000 units), the opera- 

 tor is never concerned with more than 11 pages at one times. With each 

 page clearly labeled by a numbered margin tab, search time to make an 

 entry is reduced to a minimum. 



MATCH POSITION 



The match operator performs the function of testing and making 

 busy the switching channels through which each connection is set up. 

 Her position includes ten marker units, each consisting of a group of 

 lamps, and a set of files which bold the channel cards by means of Avhich 

 the channel records are kept. The position is shown on Fig. 23. 



The No. 5 marker picks out a channel between a subscriber on a line 

 link frame and a trunk on a trunk link frame by matching a Kne link, 

 a junctor and a trunk link which are capable of being switched together 

 to connect the two end points. A schematic of the system is shown on 

 Fig. 24. 



Each horizontal group of subscribers has direct access to a set of 

 ten Une links which connect to the ten junctor switches of the frame. 

 Each Unk of the set can be given a number from to 9 corresponding 

 to the junctor switch on which it terminates. 



Verticals on each junctor switch connect to junctors which are dis- 

 tributed over all the trunk link frames in the office. In a ten trunk 

 link frame office, the ten verticals of each line Unk frame switch are 

 distributed to all ten trunk link frames. This provides a set of ten 

 junctors from each line link frame to each trunk link frame. If there are 

 less than ten trunk link frames in the office, additional sets of junctors, 

 perhaps comprising less than ten junctors per set, are provided between 

 frames. The junctors connect between like-numbered switches and within 

 a set bear the same number (0 to 9) as the switch. 



The trunk Hnks are similar to the line links except that twenty Hnks 

 connect from each trunk switch to the ten junctor switches. The twenty 



