SL1
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This article is about the PBX switchboard. For the Saturn SL1, see Saturn S-Series
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SL-1 is a digital PBX (Public Branch eXchange, or private telephone switchboard) developed at Bell-Northern Research in the early 1970s and manufactured by Northern Telecom Limited (later known as Nortel Networks, now Nortel). SL stands for Stored Logic (by Northern Telecom).
- Exploratory development on the digital technology at Northern Telecom began in 1969, in common for the SL-1 (PBX) and the DMS (public switch) product lines[1].
- R&D activities related to the SL-1 started from June 1973[1].
- It's capacity ranged originally from 100 to 7,600 lines[1]
- It is the member of Northern Telecom's digital switches family. It was announced by Northern Telecom in December 1975 (the DMS will be announced in January 1976)[1]
- It is the first fully digital PBX announced on the global market. In the early 1970s, most PBXs were either electromechanical (e.g. cross-bar) or based on an hybrid technology (e.g. switching matrix made from a two-dimensional array of contacts but control performed by an electronic logic). For this reason, the SL-1 enjoyed a great success on the enterprise market both in North-America and globally.[1]
- However, it is not the first digital switch since the inauguration of a first public digital transit exchange was announced by the Centre national d'études des télécommunications (CNET) in France in the city of Perros Guirrec in January 1970.[1]
- The SL-1 was gradually enhanced (peripheral hardware, packaging, etc.) and renamed Meridian-1 in the late 1980s. The Meridian-1 has evolved to support IP telephony and other next generation IP services.
