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<PAGE> EXHIBIT 16.1 September 21, 2000 Securities and Exchange Commission 450 Fifth Street, N.W. Washington, DC 20549 Gentlemen: We have read the comments under the caption "Changes in Independent Auditors" included on page 74 of this Form S-1 of Tellium, Inc. and are in agreement with the statements contained in the second paragraph therein. We have no basis to agree or disagree with other statements of the registrant contained therein. /s/ Ernst & Young LLP
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