Investor Relations

Second Quarter 2006 Results

Second quarter financial highlights

• SLMS revenues of $35.3 million up 6.4% over prior quarter
• Gross margin at 22% due to $7.2 million write off of legacy inventory
• Operating expenses at $24.7 million
• Non-GAAP Proforma EBITDA loss of $10.1 million
• Cash balance at $71.8 million increased for second consecutive quarter
• Cash balance net of debt obligations at $28.6 million increased for fourth consecutive quarter

Press Release

Zhone Technologies Reports Second Quarter 2006 Financial Results

Financial Statements

Form 10-Q for June 30, 2006

To supplement Zhone's consolidated financial statements presented in accordance with GAAP, Zhone uses pro forma EBITDA, a non-GAAP measure Zhone believes is appropriate to enhance an overall understanding of Zhone's past financial performance and prospects for the future. The presentation of this additional information is not meant to be considered in isolation or as a substitute for measures of financial performance prepared in accordance with GAAP. A reconciliation between net loss calculated on a GAAP basis and pro forma EBITDA on a non-GAAP basis is provided in a table immediately following the Unaudited Condensed Consolidated Statements of Operations included in the press release which can be accessed from the link above.