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Posted by jsw on January 28, 2008, 5:36 pm
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>Not surprised that Bell never got common control to work on steppers,
>they invested their energy into Panel, #1XB as well as #4XB and #5XB.
But Ma Bell *DID* have common control on some step offices.
They had their 'Director' system, 712-366 was a good example of
this.
The Director unit acted as a register-sender for both intra and
inter-office calls, storing the digits, and driving the switches
in the local office or outpulsing them to another office.
It also allowed customers to have 'real' touch-tone, as opposed
to Rube-Goldberg tone to pulse conversion.
I've been told that they had some of these in Des Moines as well.
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| ![[Telecom] Are any of the #5 Crossbar offices still in service?](/images/header.jpg)
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