TELECOM Digest OnLine - Sorted: Early Los Angeles Dialing and Network Management

Early Los Angeles Dialing and Network Management

hancock4@bbs.cpcn.com
16 Aug 2005 19:55:15 -0700

The Bell System history tells that they recognized the traffic of big
cities would not fit on Step-by-Step switching because of the switch's
limited decimal choices. Panel switching was developed to give more
flexibility and choices in city service.

However, Los Angeles remained Step by step because the Bell System
inherited existing exchanges. The history says despite things like
graded multiples network mgmt in LA proved difficult, but they did not
elaborate.

I know Bell Labs developed SxS add-ons in the 1960s and 1970s to
improve SxS functionality, but that was much later. An early short
haul toll itemized message accounting system was developed for LA.

As Los Angeles turned into a big city (1950s?), how did the Bell
System handle inter-exchange traffic within the limits of an SxS
switch? Did they rely on tandems? Did they have to overtrunk at high
expense? Did they put in No 5 Crossbar when it came out?

Thanks.

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