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ADTRAN Holdings, Inc., through its subsidiaries, provides networking and communications platforms, software, systems, and services in the United States, Germany, the United Kingdom, and internationally. It operates through two segments, Network Solutions, and Services & Support. It offers residential gateways; ethernet passive optical network ONUs; gigabit passive optical network/XGS-PON ONTs; traditional SSE, routers, and switches; edge cloud; carrier ethernet network interface devices; Optical Line Terminals; Packet Aggregation, Copper Access, and Oscilloquartz; optical transport and engine solutions; infrastructure monitoring solution; and training, professional, software, and managed services. The company also provides various software, such as Mosaic One SaaS, n-Command, Procloud, MCP, AOE and ACI-E, and Ensemble Controller. It serves large, medium, and small service providers; alternative service providers, such as utilities, municipalities and fiber overbuilders; cable/MSOs; and SMBs and distributed enterprises. ADTRAN Holdings, Inc. was incorporated in 1985 and is headquartered in Huntsville, Alabama.

Fabrinet provides optical packaging and precision optical, electro-mechanical, and electronic manufacturing services in North America, the Asia-Pacific, and Europe. The company offers a range of advanced optical and electro-mechanical capabilities in the manufacturing process, including process design and engineering, supply chain management, manufacturing, printed circuit board assembly, advanced packaging, integration, final assembly, and testing. Its products include switching products, including reconfigurable optical add-drop multiplexers, optical amplifiers, modulators, and other optical components and modules that enable network managers to route voice, video, and data communications traffic through fiber optic cables at various wavelengths, speeds, and over various distances. The company's products also comprise tunable lasers, transceivers, and transponders; and active optical cables, which provide high-speed interconnect capabilities for data centers and computing clusters, as well as Infiniband, Ethernet, fiber channel, and optical backplane connectivity. In addition, it provides solid state, diode-pumped, gas, and fiber lasers used in semiconductor processing, biotechnology and medical device, metrology, and material processing industries; and differential pressure, micro-gyro, fuel, and other sensors used in automobiles, as well as non-contact temperature measurement sensors for the medical industry. Further, the company designs and fabricates application-specific crystals, lenses, prisms, mirrors, laser components, and substrates; and other custom and standard borosilicate, clear fused quartz, and synthetic fused silica glass products. It serves original equipment manufacturers of optical communication components, modules and sub-systems, industrial lasers, automotive components, medical devices, and sensors. The company was incorporated in 1999 and is based in Grand Cayman, the Cayman Islands.

Infinera Corporation provides optical transport networking equipment, software, and services worldwide. The company's product portfolio includes Infinera Groove series for modular and sled-based platforms to support a various transport network applications; Infinera 7300 series, an SDN-ready coherent optical transport system; Infinera FlexILS open optical line system that connects various Infinera and third-party terminal equipment platforms over long-distance fiber optic cable providing switching, multiplexing, amplification, and management channels; and Infinera 7090 and 7100 series for transport platforms. It also offers Infinera XTM series, a packet-optical transport platform that enables metro connectivity solutions; Infinera XTC series, a multi-terabit packet optical transport platforms that integrates digital OTN switching and optical DWDM transmission; Infinera mTera series, a network transport solution; and Infinera XT series, a platform that is designed to power cloud scale network services over metro, DCI, long-haul, and subsea networks. In addition, the company provides Infinera Cloud Xpress Family that is designed to meet the needs of internet content providers (ICPs), communication service providers, internet exchange service providers, enterprises, and other large-scale data center operators; and ICE-X Coherent Pluggable Optics. It also offers Infinera Transcend software suite; and system software and customer support services. The company serves telecommunications service providers, ICPs, cable providers, wholesale carriers, research and education institutions, large enterprises, and government entities. It markets and sells its products and related support services primarily through its direct sales force. The company was formerly known as Zepton Networks. Infinera Corporation was incorporated in 2000 and is headquartered in San Jose, California.

Plantronics, Inc., together with its subsidiaries, designs, manufactures, markets, and sells integrated communications and collaborations solutions for corporate customers, small businesses, and individuals in the United States, Europe, the Middle East, Africa, the Asia Pacific, and rest of the Americas. Its principal product categories include headsets, which comprises wired and wireless communication headsets; voice that includes open session initiation protocol and native ecosystem desktop phones, and conference room phones; video conferencing solutions and peripherals, including cameras, speakers, and microphones designed to work with a range of unified communication and collaboration, unified communication as a service, and video as a service environments, including RealPresence collaboration solutions of infrastructure to endpoints that allows people to connect and collaborate; and content sharing solutions. The company also offers services that include video interoperability, and hardware and support for our solutions and hardware devices, as well as professional, hosted, and managed services; and cloud management and analytics software, which enables information technology administrators to configure and update firmware, monitor device usage, troubleshoot, and gain understanding of user behavior. It sells its products through value-added resellers, integrators, direct marketing resellers, service providers, direct and indirect resellers, network and systems integrators, enterprise distributors, wireless carriers, and mass merchants, as well as through both traditional and online retailers, and e-commerce channels under the Poly, Plantronics, and Polycom brands. The company was incorporated in 1961 and is headquartered in Santa Cruz, California.

Telkom SA SOC Ltd provides integrated communications and information technology (IT) services to residential, business, government, wholesale, and corporate customers in South Africa, the United States, the United Kingdom, rest of Europe, and internationally. It operates through Openserve, Telkom Consumer, BCX, Gyro, and Other segments. The company offers mobile and fixed-line telecommunication services, including broadband, optical and carrier, business-to-business connectivity, interconnect-based, broadband data, voice, content, and gaming solutions; and small and medium entity information, communication, and technology services, as well as business mobility, global telecommunication, converged communication, customer premises equipment, and internet and value-added services. It also provides cloud computing, unified communications and collaboration, security, big data analytics, and mobility solutions; enterprise and applications solutions, IT managed services and infrastructure, and cloud solutions; digital and social media advertising; and e-commerce services. The company was incorporated in 1991 and is headquartered in Centurion, South Africa.