Question: Aironet Wireless Communications, network equipment maker, was acquired in 1999 by which Silicon Valley giant?
Context: Claude Oestges is Professor at the Université catholique de Louvain, Louvain-La-Neuve, Belgium.  His research interests cover wireless and satellite communications, with a focus on the propagation channel and its impact on system performance.  His present activity concerns multi-dimensional channel modeling for wireless communications, including MIMO and cooperative networks, UWB systems and satellite systems .  In 2016, he was elected Chair of COST CA15104 "Inclusive Radio Communication Networks for 5G and Beyond" (IRACON) .  He was named Fellow of the Institute of Electrical and Electronics Engineers (IEEE) in 2016 "for contributions to channel characterization and modeling for multiple-input multipleoutput wireless communications". At the most basic level Personal Communications Service or PCS describes a set of wireless communications capabilities which allows some combination of terminal mobility, personal mobility, and service profile management.  More specifically, PCS refers to any of several types of wireless voice and/or wireless data communications systems, typically incorporating digital technology, providing services similar to advanced cellular mobile or paging services.  In addition, PCS can also be used to provide other wireless communications services, including services which allow people to place and receive communications while away from their home or office, as well as wireless communications to homes, office buildings and other fixed locations.  Described in more commercial terms, PCS is a generation of wireless-phone technology that combines a range of features and services surpassing those available in analog- and digital-cellular phone systems, providing a user with an all-in-one wireless phone, paging, messaging, and data service. Wireless Valley is a term that was coined by Professor Ted Rappaport in 1990 when he was a faculty member at Virginia Tech, and was used to describe the Roanoke/Blacksburg, Virginia region and the potential of research to create spin-out companies.  In 1990 he and his students founded TSR Technologies, a company that made software-defined cellular and paging intercept and drive test equipment that was sold to Allen Telecom in 1993, and in 1995 Wireless Valley Communications, a company that pioneered the creation of computer-aided wireless network prediction and management software that was sold to Motorola in late 2005.  This term was later used as nickname to describe several regional clusters of companies in the information technology sector, in analogy to California's Silicon Valley: ArrayComm is a wireless communications software company founded in San Jose, California, in Silicon Valley.  Co-founded in 1992 by Martin Cooper, a pioneer of the wireless industry.  The company is wholly owned by Ygomi LLC, under principal investor T. Russell Shields.  The current headquarters is Buffalo Grove, Illinois. PDT (short for "Professional Digital Trunking" or "Police Digital Trunking") is an open industry standard for trunked radio system in China servicing police wireless communications and professional mobile radio.  The standard is being maintained by the "Professional Digital Trunking System Industry Association", an association of major vendors of wireless communications equipment in China.  The association was formed with the help from Information and Communications Bureau of the Ministry of Public Security.  The standard was used to facilitate the digital transformation of the Ministry's existing MPT analogue trunking system.  Government policy supporting this domestic standard had lead to the abolishment of previous GA/T industry standards based on the European TETRA standard. Theodore (Ted) Scott Rappaport (born November 26, 1960) is an American electrical engineer in the field of wireless communications, the David Lee/Ernst Weber Professor of Electrical and Computer Engineering at New York University Tandon School of Engineering and founding director of NYU WIRELESS.  He has written several textbooks, including "Wireless Communications: Principles and Practice".  He co-founded TSR Technologies, Inc. and Wireless Valley Communications, Inc., ITU-T Recommendation G.8261/Y.1361 (formerly G.pactiming) ""Timing and Synchronization Aspects in Packet Networks"" specifies the upper limits of allowable network jitter and wander, the minimum requirements that network equipment at the TDM interfaces at the boundary of these packet networks can tolerate, and the minimum requirements for the synchronization function of network equipment. Cisco Aironet is a maker of wireless networking equipment currently operated as a division of Cisco Systems.  It was started by ex-Marconi Wireless employees in 1986 as Telesystems SLW in Canada, right after the United States Federal Communications Commission (FCC) opened up the ISM bands for spread spectrum license-free use.  Telxon acquired Telesystems SLW in 1992, and Aironet Wireless Communications was spun off from Telxon's RF Division in 1994.  Cisco Systems acquired Aironet in 1999. ARLAN is a family of both proprietary non-802.11 and 802.11-compliant wireless networking technologies developed and marketed by Aironet Wireless Communications in the 1990s prior to Aironet's acquisition by Cisco Systems.  Operating in the 900 MHz and 2.4 GHz ISM bands and offering a nominal 2.0 Mbit/s throughput, the non-802.11 DSSS products competed directly with NCR's WaveLAN technology.  After acquisition, the ARLAN lineup was renamed to Cisco Aironet; the non-802.11 products were supported briefly then discontinued. Cisco Systems, Inc. (known as Cisco) is an American multinational technology conglomerate headquartered in San Jose, California, in the center of Silicon Valley, that develops, manufactures and sells networking hardware, telecommunications equipment and other high-technology services and products.  Through its numerous acquired subsidiaries, such as OpenDNS, WebEx, Jabber and Jasper, Cisco specializes into specific tech markets, such as Internet of Things (IoT), domain security and energy management.
Answer: Cisco Systems