SL1

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This article is about the PBX switchboard. For the Saturn SL1, see Saturn S-Series
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SL1 was the first practical digital PBX (Public Branch eXchange, or private telephone switchboard), and in many ways, the first practical digital switch. It was developed in the early 1970s at Bell-Northern Research and sold by Northern Electric (later Nortel Networks). SL stands for Stored Logic (by Northern Telecom).

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