ADC Chooses Summa Four Switches for Wireless Local Loop and Lawful Intercept.

SAN DIEGO, Calif.--(BUSINESS WIRE)--May 11, 1998--ADC Wireless Systems Group, a business unit of ADC Telecommunications, Inc. (NASDAQ:ADCT; www.adc.com) and Summa Four, a leading provider of open programmable switches, today announced that they have entered into an agreement under which ADC will use Summa Four's Virtual Central Office (VCO) series and Sigma switches. ADC will use the Summa Four products in two new systems it is developing for wireless local loop and lawful intercept delivery applications.

The wireless local loop product builds on ADC's strong base station and messaging product lines to further address the wireless marketplace. The lawful intercept product supports the government-mandated delivery of lawful intercept call content and data to law enforcement agencies, compliant with the 1994 Communications Assistance for Law Enforcement Act (CALEA) enacted by Congress.

"The Sigma switch's open, standards-based architecture will ensure a flexible, highly scalable approach for building wireless services such as CALEA and wireless local loop," stated John Baker, president of ADC Telecommunications' Wireless Systems Group. "Distributed switching architectures are being employed not only for cost reasons, but also to support the seamless integration of voice and data services."

ADC has begun development on Summa Four's recently announced VCO/4K, and will transition to Project Sigma switches when they become available later this year. Both products will be deployed by ADC globally. They will incorporate Summa Four's Intelligent Call Services (ICS), a suite of software tools, databases and utilities that simplify the development process and enable fast time-to-market. ADC will also take advantage of Summa Four's broad array of network and signaling interfaces including E-1 channel associated signaling (CAS)and programmable R2, as well as ADC's own AccessMANAGER(TM) SS7 stack from ADC's NewNet division. The AccessMANAGER SS7 stack is already deployed in over thirty countries around the world.

"Lawful intercept and wireless local loop are key markets for Summa Four," said Bob Degan, Summa Four's president and CEO. "We look forward to a long-term relationship with ADC, one of the most respected players in the global telecom market."

About ADC Telecommunications, Inc.

ADC Telecommunications, Inc., is a leading global supplier of voice, video and data systems for telephone, cable television, Internet, broadcast, wireless and private communications networks. ADC's systems enable local access and high-speed transmission of communications services from providers to consumers and businesses over fiber-optic, copper, coaxial and wireless media. Headquartered in Minneapolis, Minnesota, ADC has approximately 6,000 employees around the world and annual sales of $1.2 billion.

About Summa Four, Inc.

Summa Four is a leading provider of open, programmable switching platforms that enable telecommunications service providers worldwide to build networks that support the rapid deployment of new wireline and wireless services. An ISO 9001 certified company, Summa Four is headquartered in Manchester, NH, and has sales, service, and support offices in the United States, the United Kingdom, Singapore and Japan.

This document contains certain forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. For this purpose, any statements contained herein that are not statements of historical fact may be deemed to be forward looking statements. Without limitation, the words "when they become available later this year," "look forward to," "will," and similar expressions are intended to identify forward-looking statements. Such forward looking statements are subject to risks and uncertainties which could cause actual results to differ materially from those anticipated. Such risks and uncertainties include, but are not limited to, unanticipated delays or difficulties in commercial development of wireless local loop, lawful intercept or the SIGMA switch, fluctuations in customer demand, and general economic and industry conditions, as well as other risks included in the company's periodic reports filed with the Securities and Exchange Commission. Summa Four and ADC assume no obligation to update the information contained in this press release.

Product and service names used within are trademarks, registered trademarks and service marks of their respective owners.

CONTACT: Peter Carlino

Director, Corporate Communications

Summa Four, Inc.

[phone], ext. 2276

Internet: www.summa4.com

or

Lynne High

Corporate Marketing Communications

ADC Telecommunications

[phone]

or

Mark Borman

Investor Relations

ADC Telecommunications

[phone]