Com21 and Siemens Win Key Deployment With Brazilian Telephone Operator Telegoias.

MILPITAS, Calif.--(BUSINESS WIRE)--Sept. 22, 1998--

Telegoias Telephone Operator to Use Com21's

ComUNITY Access System for Large-Scale

Data-Over-Cable Service in Brazil

Com21, Inc. (Nasdaq:CMTO) announced today that Siemens has won a key cable modem deployment in Brazil.

Siemens, a Com21 worldwide systems integration partner, has received an order from Telegoias, a telephone operator located in Brazil, for the Com21 ComUNITY Access(R) System and 1,000 ComPORT cable modems. This system will be installed later this year to deliver high-speed communication within the capital city of Goiania.

Telephone operator Telegoias serves over 1 million people in the capital city Goiania in the state of Goias, located about 125 miles west of Brasilia, Brazil's capital city. Telegoias will have 115,000 households passed at the end of the current deployment phase.

Telegoias conducted rigorous lab tests for three months to verify that the Com21 equipment met the operator's technical specifications and needs. Com21 cable modem systems will be supplied through the Siemens sales organization, which will also support integration, installation and introduction of the service.

President of Com21 Peter Fenner said, "Siemens world-class customer service and technical expertise, combined with Com21's cutting edge and reliable technology, has resulted in a successful partnership that provides an advanced cable modem solution. We are pleased to have been selected by Telegoias. We continue to experience rapid deployment of our ComUNITY Access system in cable modem services worldwide."

Siemens has already deployed the ComUNITY Access system in Europe, Latin America, and Asia. Siemens supplies telecommunication and cable TV network configurations tailored to the service provider's requirements for the performance of broadband multi-service networks.

"Telegoias chose Com21 because of its Quality of Service (QoS), scalability, robustness and the fact that the system does exactly what Com21 says it will do," said Rodrigo Uchoa, computing and information systems engineer at Telegoias. "Another factor that influenced the decision was Com21's Return Path Multiplexer (RPM) solution, which enables cost-effective deployment even during initial times of sparse market penetration," said Carlos Baptista, Siemens CATV operators key account manager. The unique design of the RPM product combats ingress noise issues without sacrificing performance or forcing the cable operator to offer reduced QoS levels in some locations within the service area. Com21's ComUNITY System will be deployed as the local access segment of a metropolitan network offering high speed Internet and data communications services in Goiania, both to households and businesses. Telegoias, along with other recently privatized telephone companies, is a member of Tele CentroSul, a telecommunications company spanning eight Brazilian states.

Com21 is a leading global provider of cable modem technology for delivering high-speed Internet access over CATV systems. The company enables cable operators and service providers with the abilities to provide high-speed, cost-effective Internet access to corporate telecommuters, small businesses, home offices and residential users. Founded in 1992 and completing its initial public offering in May of 1998, its stock is publicly traded on Nasdaq under the symbol CMTO. Com21 is headquartered in Milpitas. For more information, visit the Com21 web site at www.com21.com.

This press release contains forward-looking information within the meaning of Section 27A of the Securities Exchange Act of 1933 and Section 21E of the Securities Exchange Act of 1934, and is subject to the safe harbors created by those sections. These forward-looking statements include statements related to Com21, Inc.'s ability to deploy new technology and meet customer and market requirements. Actual results may differ because of numerous technology, development, and market conditions, operational capabilities, and competitive measures. The matters discussed in this press release should also be read in conjunction with risks and uncertainties described in Com21's filings with the Securities and Exchange Commission (SEC). In particular, see the risk factors described in Com21's Final Prospectus for the Company's initial public offering dated May 21, 1998 and the Company's Form 10Q dated Aug. 5, 1998. Com21 assumes no obligation to update the forward-looking information contained in this press release.