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In page Nortel:

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In March 1976, the company name was changed to Northern Telecom Limited, and management announced its intention to concentrate the company's efforts on digital technology.[1] Northern Telecom was the first company in its industry to announce and deliver a complete line of fully digital telecommunications products.[citation needed] The product line was branded "Digital World" and included the DMS-100, a fully digital central office switch serving as many as 100,000 lines, which was a key contributor to the company's revenue for close to 15 years.[2]