TELETYPEWRITER EXCHA NGE S YSTEM 



513 



the subscribers' multiple. This arrangerhent provides sufficient space 

 for the installation of 840 trunks equipped with answering lamps. 

 As all trunks are answered at the separate inward switchboard, the 

 answering lamps may be removed from the trunk multiple in the two 



MISCELLANEOUS 



INTER-TOLL TRUNK MULTIPLE 



SUBSCRIBER L MULTIPLE 



MISCELLANEOUS. 



INTER-TOLL TRUNK MULTIPLE, 



SUBSCRIBER L MULTIPLE, 



TRUNK 

 UNITS 



TEST 

 BOARD 



Fig. 5 — Diagram of cabling for inter-toll trunks on No. 1 Teletypewriter Switch- 

 board. 



outward switchboards, thereby releasing sufficient space for the full 

 840 trunks without the answering lamps. 



No. 3 A Teletypewriter Switchboard 



The design of a switchboard for the medium sized TWX switching 



points was not undertaken until the system had been in operation for 



about two years, temporary switching facilities having been used at 



these points in the meantime. Actual operating experience and 



