Zhone to Present at Thomas Weisel Partners Tech2005 Conference.

OAKLAND, Calif. -- Zhone Technologies, Inc. (Nasdaq:ZHNE) today announced it will be presenting at the third annual Thomas Weisel Partners Technology Conference, to be held at The Fairmont Hotel in San Francisco, California, on February 7-9, 2005.

This event is an exclusive gathering of leading technology company CEOs and institutional portfolio managers. During the three-day event, investors will have access to over 160 leading public and private companies in software, hardware, systems and services.

Zhone's audio only presentation will be broadcast live via the Internet on Tuesday, February 8, 2005 at approximately 4:25 p.m. Pacific Time. The live audio webcast and replay of the presentation can be found on the Investor Relations section of Zhone's website at http://www.zhone.com/about/investors/index.html

About Zhone Technologies, Inc. (Zhone)

Zhone (Nasdaq:ZHNE) designs and manufactures network equipment for network operators worldwide. Zhone's products allow network operators to deliver a rich array of voice, data, video, and entertainment services over their existing networks while simultaneously retooling for converged packet based voice (VoIP) and video (IPTV) over copper or fiber access lines.

Zhone's advanced networking solutions include the Single Line Multi-Service architecture (SLMS(TM)), Multi-Access Line Concentrator (MALC(TM)), Raptor(TM) ATM/IP DSLAMs, FiberSLAM(TM) Optical Line Terminal, Zhone Residential Gateways (ZRG(TM)), GigaMux(TM) Optical Transport Systems and Zhone Management System (ZMS(TM)). With over one million subscriber interfaces shipped and deployments at over 300 carriers including among some of the world's largest networks, Zhone has enabled network operators to reinvent their businesses. For more information, please visit http://www.zhone.com

Zhone, the Zhone logo, and all Zhone product names are trademarks of Zhone Technologies, Inc. Other brand and product names are trademarks of their respective holders. Specifications, products, and/or product names are all subject to change without notice. (C)Copyright 2005 Zhone Technologies, Inc. All rights reserved.