![]() Unlike the earlier Vantage system, the Norstar went on to be one of the leading telephone systems in the world. This system directly competed with the AT&T Merlin, ROLM Redwood, Executone/Isotec Hybrid systems, Toshiba DK Strata, and NEC hybrid systems. In 1988, Nortel developed the Meridian Norstar system. Unlike the success of the SL1 system, the Vantage system did not catch with the business environment and the Meridian Norstar was developed as its replacement. The first key system developed by Northern Telecom in the early 1980s was the Vantage TDD system. With the advent of LSI ICs, also called integrated circuits in the 1980s, key telephone system design went from electro-mechanical parts to electronic or fully digital parts. ![]() Later model Northern Telecom Norstar M7324 Switchboard Telephone
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