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Folder No. 5 Crossbar book

This is a digital reproduction of a book published by Bell Labs containing a number of articles from 1949 to 1951 that detail most aspects of the No. 5 Crossbar. The articles were all publised in the Bell Laboratories Record.

The entire book is 150 pages. Due to the large number of images the book is presented with each article in a separate PDF. This makes the file sizes more manageable. Scanned and converted to PDF by Sam Etler.

Documents

Select Toggle Title Date Download
pdf 20-OperatorConnections (671 downloads) Popular Download (pdf, 180 KB)
pdf 21-ColdCathodeTubeTestSet (729 downloads) Popular Download (pdf, 1.63 MB)
pdf 22-MaintenanceFacilities (656 downloads) Popular Download (pdf, 1.04 MB)
pdf 23-AutomaticMonitor (676 downloads) Popular Download (pdf, 236 KB)
pdf 24-TroubleRecording (1221 downloads) Popular Download (pdf, 2.11 MB)
pdf 25-RegisterAndSenderTesting (610 downloads) Popular Download (pdf, 948 KB)
pdf 26-PermanentSignals (731 downloads) Popular Download (pdf, 292 KB)
pdf 27-PulseConversion (664 downloads) Popular Download (pdf, 157 KB)
pdf 28-AlarmSystem (745 downloads) Popular Download (pdf, 965 KB)
pdf 29-InterofficeTransferOfAlarms (679 downloads) Popular Download (pdf, 249 KB)
pdf 30-AMATranslator (691 downloads) Popular Download (pdf, 2.66 MB)
pdf 31-Pretranslation (700 downloads) Popular Download (pdf, 1.28 MB)
pdf 32-TrafficRegisters (629 downloads) Popular Download (pdf, 3.06 MB)

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Recent Contributors

Thanks for new documents from Tim Fox, Andrew Cook, Steph Kerman, Jason Anderson, Doug Duffy, Bruce Patterson, Jeremy Walters, Nick Hunseder, Ed Burnett, Ralph Meyer, Shane Young, David Brown, the Connections Museum, Paul Fassbender, Lou Maffei, Rick Thoensen, Sheila Flory, Tom Hesson, Jim Hurtle, Ed Palazzo, Remco Enthoven, Jon Kolger, Paul Ivester, and Len Hicken.

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