Meridian SL-1

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The Meridian SL-1 was the first practical all-digital telephone switch aimed at the smaller PBX market. It was first introduced by Northern Telecom, now Nortel, in 1975, and went on to power the company into a leadership position in the telephony world. The successful design was later expanded "up and down" to provide products at all sizes, including the DMS series high-end machines, and the Meridian Norstar for smaller installations up to 200 users.