Linkabit

Linkabit Corporation was an American communications-technology company established in 1968 in Los Angeles by Irwin M. Jacobs of the University of California, San Diego, and Andrew J. Viterbi and Leonard Kleinrock of the University of California, Los Angeles. The company focused on digital communications, information theory, networking, and satellite systems, with much of its work serving government, aerospace, and defense applications. Kleinrock soon left the company while continuing his contributions to the early development of ARPANET; Jacobs and Viterbi remained central figures in Linkabit’s subsequent growth. The company became notable for translating advanced communications theory into operational systems. During the 1970s, Linkabit designed and managed SATNET for the Defense Advanced Research Projects Agency, an early packet-satellite networking project associated with the development of internetworking technologies. Between 1969 and 1976, Linkabit engineers, working with Jacobs and Viterbi, also applied coding-theory techniques to improve the reliability and effective signal strength of communications used by NASA’s Voyager interplanetary probes. These projects helped establish the company’s reputation in highly demanding communications environments where bandwidth, signal integrity, and resistance to transmission errors were critical. Linkabit also pursued proprietary hardware development. In 1974, it designed and contracted for production of the Linkabit Microprocessor, or LMP. In the late 1970s and early 1980s, the LMP supported a family of defense satellite-communications terminals, including the Command Post Modem/Processor, Dual Modem, and Tri Modem. The company’s work combined modem design, digital signal processing, coding, networking, and systems integration rather than concentrating on a single consumer product category. Linkabit was acquired by M/A-COM in a transaction announced in November 1979 and completed in August 1980 for $25 million. It continued operating within M/A-COM during the early 1980s. A Linkabit division developed VideoCipher, an analog television-scrambling system, in 1983. The San Diego Linkabit facilities also hosted the first Internet Engineering Task Force meeting in January 1986, reflecting the company’s continuing connection to the emerging computer-networking community. Jacobs and Viterbi left M/A-COM in April 1985. M/A-COM subsequently separated Linkabit’s activities: General Instrument acquired the VideoCipher business in 1986, while the commercial satellite business was sold in 1987 and became part of the foundation of Hughes Network Systems. In 1990, the remaining government-contracting business, together with the Linkabit name, was sold to Titan Corporation. Titan was acquired by L-3 Communications in 2005, and L-3 Communications merged with Harris Corporation in 2019 to form L3Harris Technologies. Linkabit is therefore best understood today as a successor defense-communications operation and historical corporate name within L3Harris, rather than as an independent publicly traded company. Linkabit’s influence extended beyond its direct products. More than 200 wireless-related start-ups were formed in the San Diego region between 1971 and 2000, and accounts of the company’s alumni network identify numerous direct and indirect Linkabit spin-offs. The most prominent was Qualcomm, founded in 1985 by Jacobs, Viterbi, and other Linkabit alumni. ViaSat, founded in 1986 by three Linkabit alumni, was another notable successor enterprise. This entrepreneurial legacy, together with the company’s work on satellite networking, coding, and digital communications, makes Linkabit an important predecessor institution in the development of modern wireless and aerospace communications.

Linkabit Corporation was founded in mid-1968 in Los Angeles by Irwin M. Jacobs, Andrew J. Viterbi, and Leonard Kleinrock. Its early identity was shaped by the convergence of academic communications research, computer networking, and defense contracting. Kleinrock soon departed, while Jacobs and Viterbi continued building the company around digital communications systems and applied information theory. During the 1970s, Linkabit worked on satellite and packet-networking systems. For DARPA, it designed and managed SATNET, an early packet-satellite network that contributed to the broader evolution of internetworking. Linkabit engineers also worked with Jacobs and Viterbi from 1969 through 1976 on coding methods for NASA communications with the Voyager probes. The objective was to improve the reliability and usable strength of signals sent across interplanetary distances. The company developed proprietary hardware as well as communications systems. In 1974, it designed and contracted for manufacture of the Linkabit Microprocessor. The LMP was subsequently used in defense satellite-communications terminals, including the Command Post Modem/Processor, Dual Modem, and Tri Modem. These products reflected Linkabit’s emphasis on specialized, high-reliability systems rather than mass-market computing. M/A-COM announced its acquisition of Linkabit in November 1979 and completed it in August 1980 for $25 million. Linkabit remained an operating division during the first part of the 1980s. Its activities broadened to include commercial and media communications; VideoCipher, an analog television-scrambling system, was developed by the M/A-COM Linkabit division in 1983. The company also retained a strong connection to the networking community. In January 1986, M/A-COM hosted the first IETF meeting at its San Diego Linkabit facilities. Jacobs and Viterbi left M/A-COM in April 1985. M/A-COM then dismantled or sold different portions of the former Linkabit operation. General Instrument acquired the VideoCipher division in 1986. In 1987, the commercial satellite business of Linkabit and the former Digital Communications Corporation was sold and became part of the nucleus of Hughes Network Systems. The remaining government-contracting business, along with the Linkabit name, was sold to Titan Corporation in 1990. Titan was acquired by L-3 Communications in 2005. In 2019, L-3 Communications merged with Harris Corporation, creating L3Harris Technologies. Through these successive transactions, Linkabit ceased to function as an independent corporation but continued as a successor operation and historical business identity within the defense-communications portfolio of L3Harris. Linkabit also had an unusually strong entrepreneurial legacy. Accounts of the San Diego wireless industry identify more than 200 wireless-related start-ups formed in the region from 1971 to 2000, with many connected directly or indirectly to Linkabit alumni. Qualcomm was founded in July 1985 by Jacobs, Viterbi, and five other Linkabit alumni. ViaSat, founded in 1986 by three Linkabit alumni, was another important spin-off. The company’s alumni network therefore influenced both defense communications and the later commercial wireless industry. The founders also received major national recognition: Jacobs received the National Medal of Technology in 1994, while Kleinrock and Viterbi received National Medals of Science in 2008.

• 2019

  L3Harris is formed

  [1]Linkabiten.wikipedia.org

  L-3 Communications merges with Harris Corporation, placing the Linkabit successor business within L3Harris Technologies.

• 2005

  Titan joins L-3 Communications

  [1]Linkabiten.wikipedia.org

  L-3 Communications acquires Titan Corporation, including the successor Linkabit operation.

• 1990

  Remaining Linkabit business is sold to Titan

  [1]Linkabiten.wikipedia.org

  Titan Corporation acquires the remaining government-contracting business and the Linkabit name.

• 1987

  Commercial satellite business joins Hughes Network Systems

  [1]Linkabiten.wikipedia.org

  M/A-COM sells the commercial satellite business associated with Linkabit and Digital Communications Corporation.

• 1986

  VideoCipher division is sold

  [1]Linkabiten.wikipedia.org

  General Instrument acquires the VideoCipher division from M/A-COM.

• 1985

  Jacobs and Viterbi leave M/A-COM

  [1]Linkabiten.wikipedia.org

  The two principal continuing founders depart M/A-COM in April; Jacobs and Viterbi later help establish Qualcomm with other Linkabit alumni.

• 1983

  VideoCipher is developed

  [1]Linkabiten.wikipedia.org

  The M/A-COM Linkabit division develops VideoCipher, an analog television-scrambling system.

• 1980

  M/A-COM acquisition is completed

  [1]Linkabiten.wikipedia.org

  M/A-COM completes the purchase for a reported $25 million, retaining Linkabit as an operating division.

• 1979

  M/A-COM acquisition is announced

  [1]Linkabiten.wikipedia.org

  M/A-COM announces an agreement to acquire Linkabit.

• 1974

  Linkabit Microprocessor is developed

  [1]Linkabiten.wikipedia.org

  The company designs and contracts for production of its proprietary Linkabit Microprocessor, later used in defense communications equipment.

• 1969

  Voyager communications work begins

  [1]Linkabiten.wikipedia.org

  Linkabit engineers begin applying coding theory to improve the reliability of communications for NASA’s Voyager missions, continuing this work through 1976.

• 1968

  Linkabit is founded

  [1]Linkabiten.wikipedia.org

  Irwin M. Jacobs, Andrew J. Viterbi, and Leonard Kleinrock establish Linkabit Corporation in Los Angeles.

A research-driven defense and aerospace communications company specializing in reliable digital, satellite, and networking systems.

• Packet-satellite networking

  SATNET

  SATNET was an early packet-satellite networking project designed and managed by Linkabit for DARPA during the 1970s. It formed part of the experimental networking environment that helped demonstrate communications across geographically separated computer networks. Linkabit’s role connected its satellite-communications engineering capabilities with the emerging field of computer internetworking.

• Communications microprocessor · 1974

  Linkabit Microprocessor (LMP)

  The Linkabit Microprocessor was a proprietary processor designed by Linkabit in 1974 and produced under contract. It was used as a technological foundation for specialized defense satellite-communications equipment developed in the late 1970s and early 1980s. The LMP illustrates the company’s practice of developing custom computing hardware to meet the requirements of demanding communications systems.

• Defense satellite-communications terminal

  Command Post Modem/Processor (CPM/P)

  The Command Post Modem/Processor was one of a series of defense satellite-communications terminals developed with the Linkabit Microprocessor. It combined modem and processing functions for military communications environments in which reliable transmission and specialized signal handling were important. It belonged to Linkabit’s late-1970s and early-1980s defense systems portfolio.

• Defense communications equipment

  Dual Modem and Tri Modem

  The Dual Modem and Tri Modem were additional Linkabit satellite-communications terminals developed for defense applications. They extended the company’s use of proprietary processing technology in systems requiring multiple communications functions and dependable operation. Detailed commercial specifications and deployment figures are not established in the supplied reference material.

• Television scrambling system · 1983

  VideoCipher

  VideoCipher was an analog television-scrambling system developed by the Linkabit division of M/A-COM in 1983. It represented the company’s expansion from government and aerospace communications into commercial media-distribution technology. M/A-COM later sold the VideoCipher division to General Instrument in 1986.

• 2019

  Linkabit successor operations enter L3HarrisM&A

  Background

  Titan had been acquired by L-3 Communications in 2005, leaving the successor Linkabit operation within L-3’s corporate structure.

  Action taken

  L-3 Communications merged with Harris Corporation to create L3Harris Technologies.

  Aftermath

  Linkabit is now identified as a division or successor operation of L3Harris rather than an independent company.

  Source

• 1990

  Titan acquires the remaining Linkabit businessM&A

  Background

  After M/A-COM had sold major commercial portions of the former company, the remaining government-contracting business retained the Linkabit name.

  Action taken

  Titan Corporation acquired the remaining business and the Linkabit name.

  Aftermath

  The business later entered the L-3 Communications organization through Titan’s 2005 acquisition.

  Source

• 1986

  M/A-COM separates Linkabit business linesStrategy

  Background

  Following the departure of Jacobs and Viterbi, M/A-COM began selling or transferring parts of the former Linkabit portfolio.

  Action taken

  M/A-COM sold the VideoCipher division to General Instrument in 1986 and subsequently transferred the commercial satellite business to form part of Hughes Network Systems.

  Aftermath

  The Linkabit operation was divided among successor businesses, while the remaining government-contracting activities and the Linkabit name eventually moved to Titan.

  Source

• 1979

  Linkabit agrees to be acquired by M/A-COMM&A

  Background

  Linkabit had developed a portfolio spanning satellite communications, networking, and defense systems. M/A-COM announced an agreement to purchase the company in November 1979.

  Action taken

  M/A-COM acquired Linkabit, with the transaction completed in August 1980 for a reported total price of $25 million.

  Aftermath

  Linkabit continued as a M/A-COM operation during the early 1980s, while its founders Jacobs and Viterbi remained for several years before departing in 1985.

  Reported acquisition price. $25 million (Transaction completed August 1980)

  Source

1. 1Linkabiten.wikipedia.org