pdf SxS Demo Notes - John Jones - Jan 2018 Popular
By Paul F 1206 downloads
SxS_Demo_Notes_John_Jones_Jan_2018_ocr_tci.pdf
Contributed by John Jones. Provides simplified connection diagrams produced while building a single link SXS demo system. Contains details of several variations of L/CO Line/Cutoff circuit, Western Electric Central Office 33013 Linefinders, 30976 and 32183 first selectors, 30215 and 31739 connectors as well as the 30978 reverting selector. It also contain information on the 31779 outgoing trunk and a ringback trunk designed by Rick Walsh as well as simplified alarm circuits
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