EXHIBIT 99.1

CONSENT OF MORGAN STANLEY & CO. INCORPORATED

We hereby consent to the use in the Registration Statement of Tellium, Inc. on Form S-4 and in the Joint Proxy Statement / Prospectus of Tellium, Inc. and Zhone Technologies, Inc., which is part of the Registration Statement, of our opinion dated July 25, 2003 appearing as Annex D to such Joint Proxy Statement / Prospectus, and to the description of such opinion and to the references to our name contained therein under the headings “Summary—Opinion of Morgan Stanley to Tellium,” “The Merger—Background of the Merger” and “The Merger—Opinion of Morgan Stanley to Tellium.” In giving the foregoing consent, we do not admit that we come within the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended (the “Securities Act”), or the rules and regulations promulgated thereunder, nor do we admit that we are experts with respect to any part of such Registration Statement within the meaning of the term “experts” as used in the Securities Act or the rules and regulations promulgated thereunder.

MORGAN STANLEY & CO. INCORPORATED
By:	/s/    MICHAEL BOUBLIK
	Michael Boublik Managing Director

New York, New York

August 13, 2003