ADC Telecommunications

ADC Telecommunications, Inc.
Company type	Public
Industry	Telecommunications
Founded	1935 in Minneapolis, Minnesota, United States
Founder	Ralph Allison, Walter Lehnert
Defunct	2010
Fate	Acquired by TE Connectivity (formerly Tyco Electronics)
Headquarters	Eden Prairie, Minnesota, United States
Area served	Worldwide
Products	Telecommunications equipment and solutions
Parent	TE Connectivity (2010–2015), then CommScope (from 2015)
Website	www.commscope.com

ADC Telecommunications, Inc. was a communications firm based in Eden Prairie, Minnesota, a suburb near Minneapolis. In December 2010, TE Connectivity (formerly Tyco Electronics) acquired the company, ending its existence as an independent organization. Since August 2015, following CommScope’s purchase of the Broadband Network Solutions division from TE Connectivity, ADC-branded products have been marketed by CommScope.

History

Established in 1935 in Minneapolis by founders Ralph Allison and Walter Lehnert, ADC originally specialized in manufacturing hearing aids and audiometers. By 1945, the company began distributing audiometers under its own label. Early developments included audio systems designed for the University of Minnesota, featuring connectors and jackfields that later became foundational components in its telecommunications offerings.

After selling the audiometer segment in 1949 and following Allison’s exit, ADC redirected its focus under Lehnert’s guidance toward transformers, power line filters, military electronics, and telephone jacks and plugs. The 1961 merger with Magnetic Controls Company broadened its portfolio to include power supplies and magnetic amplifiers associated with the U.S. space program. Among notable innovations was the bantam jack, which established itself as an industry benchmark for telephone circuit access.

During the early 1970s, ADC launched prewired connectorized jackfields along with testing equipment tailored for telephone companies. By 1976, it had become the largest independent supplier of test boards within the United States. The company experienced accelerated growth after AT&T’s deregulation in 1983 expanded the telecommunications market by 90%, positioning ADC as a primary vendor to Regional Bell Operating Companies (RBOCs).

In the early 1990s, ADC sought expansion into datacom sectors through acquisitions but faced challenges integrating these new businesses. This prompted a strategic pivot from exclusively hardware-based products toward software solutions; however, limited achievements combined with the dot-com crash adversely affected both financial outcomes and stock market valuation.

In July 2010, Tyco Electronics acquired ADC Telecommunications for roughly $1.25 billion in enterprise value at a cash price of $12.75 per share. The transaction finalized on December 9, 2010.

On January 28, 2015, TE Connectivity announced an agreement to divest its Broadband Network Solutions unit—including ADC—to CommScope for $3 billion in cash. The deal closed on August 31, 2015, integrating ADC’s portfolio into CommScope’s worldwide operations.

Corporate acquisitions

In 1990, ADC acquired Telinq. Three years later, in 1993, it purchased Fibermux Corp., a producer of LAN hubs and data multiplexers. In 2001, Kentrox was sold to private equity firm Platinum Equity.

ADC also bought American Lightwave Systems, known for uncompressed video transport equipment aimed at telecom carriers; this division was subsequently sold to C-COR Electronics.

The company merged with ITS (Information Transmission Systems) in 1996 but later divested this unit. In May 1997, ADC entered into an agreement to acquire The Apex Group Inc. for approximately $26 million.

In 1999, ADC acquired Saville and followed up by purchasing Sweden-based Altitun in 2000. That same year saw the acquisition of PairGain Technologies Inc. for $1.6 billion paid in stock.

In 2004, ADC expanded by acquiring KRONE, a provider of copper and fiber connectivity products and services. The next year brought further growth through acquisitions of Fiber Optic Network Solutions (FONS), enhancing FTTX capabilities, and OpenCell to strengthen wireless coverage.

G-Connect was added to the portfolio in 2006 for an undisclosed sum, followed by LGC Wireless in 2007. In 2008, ADC boosted its manufacturing footprint and market reach in China by acquiring Century Man Communications.

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