Yazaki Network Systems Co., Ltd.
Japanese manufacturer of network equipment — PBX/IP-PBX, routers, switches and smart-meter communication units — based in Minami-Alps, Yamanashi, and part of the Yazaki Group since 2025.
Last updated September 27, 2026
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Overview
Yazaki Network Systems Co., Ltd. (abbreviated Y-NET) is a Japanese manufacturing company headquartered at 3346 Arino, Minami-Alps, Yamanashi Prefecture. Its business is the manufacture of network-related products — PBX and IP-PBX telephone systems, routers and switches, and communication units for smart meters — together with network-equipment kitting services, alliance product evaluation, customer network construction support, and the design and prototyping of electronic circuit boards and electronic circuit devices. Its main customers include Fujitsu Limited, companies of the Fujitsu Group, and Furukawa Network Solution Corporation. The company reports capital of 100 million yen and sales of 14.5 billion yen for the fiscal year 2025, with 315 employees on a consolidated basis of 341 as of April 1, 2026. The company's roots go back to October 1943, when Hasegawa Electric Manufacturing Co., Ltd. was established in Tokyo. Over the postwar decades it became a designated producer for the Ministry of Telecommunications and later for the National Police Reserve (today's Ministry of Defense), and from the 1950s it manufactured switching equipment for Denshin Denwa Kōsha (the former NTT) and took over products from Fujitsu. A Yamanashi plant was opened in Minami-Alps in 1960, and the company later moved its head office there in 2006. It was renamed Fujitsu I-Network Systems Limited in 1996 and Fujitsu I-Technology Limited in 1997, before returning to the Fujitsu I-Network Systems name. In 2022 Keystone Partners took an equity stake, changing the capital structure, and in 2025 Yazaki Energy System Corporation also took an equity stake. On July 4, 2025 the company changed its name from Fujitsu I-Network Systems Limited to Yazaki Network Systems Co., Ltd. It is now a member of the Yazaki Group, while continuing to serve Fujitsu and other customers as a contract manufacturer and network-equipment specialist. In October 2025 it concluded an absorption-type merger agreement with Y-I Tech Co., Ltd., effective October 21, 2025. Today the company positions itself around "monozukuri" (manufacturing) using advanced DX technology and services tailored to customer needs, from its base in the Southern Alps region of Yamanashi. It promotes factory IoT and DX initiatives, including IoT DataShare, RPA and MotionBoard, AI image judgment, diagnostic prediction, AR, robots and AGVs, and 5G, and it operates a network-equipment kitting service known as the Minami-Alps Network Workshop.
History
The company's history begins in October 1943, when Hasegawa Electric Manufacturing Co., Ltd. was established in Tokyo, with its head office in Shiba-Mita, Minato ward, and a factory in Azabu-Ninohashi. In 1945 the head office moved to Denenchofu and the company was forcibly evacuated by military order; in 1946 it became a designated producer for the Ministry of Telecommunications, and in 1950 a designated producer for the National Police Reserve (today's Ministry of Defense), supplying the BD-72 field switchboard. In 1952 the head office and factory moved to Koyamadai, Shinagawa ward. In 1954 the company began manufacturing night converters, and in 1955 it took over production from Fujitsu for Denshin Denwa Kōsha (the former NTT). In 1957 it became a designated producer of switching equipment for Denshin Denwa Kōsha. In 1960 it opened the Yamanashi plant in what is now Minami-Alps. During the 1960s the company prototyped a 10-line electronic switchboard (1962), produced a 3-line add-on button telephone (1963), completed the design and construction of the Miyakezaka traffic control system (1964), and was recognized as a bell manufacturer for its 8-type extension bells for Denshin Denwa Kōsha (1966), also taking over the H-type switchboard from Fujitsu that year. In the 1970s it manufactured CP-20 crossbar switchboards and radio relay consoles for Denshin Denwa Kōsha, opened the Koyama plant and began manufacturing home telephones (1973), produced B-62 and B-63 magneto bells (1976), and manufactured the No. 1 residential telephone device (103 Home Telephone) for Denshin Denwa Kōsha (1979). In 1980 the head office moved to Nishi-Gotanda, Shinagawa ward, and the company jointly developed and manufactured electronic telephone devices with Fujitsu (ESD-60A, FETEX-50 for Fujitsu). It moved its head office again in 1985, developed its own products for overseas markets (HEK-EB824, HEK-EB1232 in 1985 and HEK-EB514 in 1986), manufactured D70-LCF office switchboard racks for NTT (1987), closed the Koyama plant (1988), established Fujitsu ACS (1989), and began manufacturing automatic MDF remote-control wiring switching equipment for NTT (1991). In 1993 it took over the robotic MDF from Fujitsu and produced the Howdy cordless phone CP-R40 for NTT. In 1995 the head office moved to Akebono-cho, Tachikawa, and F.H. Business Support Co., Ltd. was established. In 1996 the company changed its name from Hasegawa Electric Manufacturing Co., Ltd. to Fujitsu I-Network Systems Limited and moved its head office to Nishi-Shinjuku. In 1997 it integrated Fujitsu ACS and established Fujitsu I-Technology Limited. In 2000 the head office moved to Musashi-Kosugi, Nakahara ward, Kawasaki, and the company was renamed F-I Tech Co., Ltd.; in 2001 it took over office switchboard manufacturing from Fujitsu. In 2002 it took over the router business from PFU. In 2005 it restructured its business, transferring sales and engineering to Fujitsu and specializing in manufacturing as a 100% Fujitsu-owned company. In 2006 the head office moved to Minami-Alps, Yamanashi, and the company began its Cisco business. In 2010 it began manufacturing smart-meter communication units. In 2011 it began manufacturing the IP-PBX "LEGEND-V". In 2015 it introduced IoT DataShare, RPA and MotionBoard to promote factory IoT. In 2017 it began network-equipment kitting services (the Minami-Alps Network Workshop) and remote verification. In 2019 it introduced AI image judgment, diagnostic prediction technology, AR, robots and AGVs, and 5G to promote its DX factory. In 2022 Keystone Partners took an equity stake, changing the capital structure. In 2025 Yazaki Energy System Corporation also took an equity stake, and on July 4, 2025 the company changed its name from Fujitsu I-Network Systems Limited to Yazaki Network Systems Co., Ltd. In October 2025 it concluded an absorption-type merger agreement with Y-I Tech Co., Ltd., effective October 21, 2025.
- 2006
Head office moves to Minami-Alps, Yamanashi; begins Cisco business.
- 2005
Restructures business, transferring sales and engineering to Fujitsu and specializing in manufacturing as a 100% Fujitsu-owned company.
- 2002
Takes over the router business from PFU.
- 2001
Takes over office switchboard manufacturing from Fujitsu.
- 2000
Renamed to F-I Tech Co., Ltd.
- 1997
Integrates Fujitsu ACS and establishes Fujitsu I-Technology Limited.
- 1996
Renamed from Hasegawa Electric Manufacturing Co., Ltd. to Fujitsu I-Network Systems Limited.
- 1993
Takes over the robotic MDF from Fujitsu; produces the Howdy cordless phone CP-R40 for NTT.
- 1991
Begins manufacturing automatic MDF remote-control wiring switching equipment for NTT.
- 1989
Establishes Fujitsu ACS.
Products and positioning
Contract manufacturer and network-equipment specialist serving Fujitsu and other customers, combining advanced DX-driven manufacturing with tailored services from its base in the Southern Alps region of Yamanashi.
PBX / IP-PBX
Telephone exchange systems, including the IP-PBX "LEGEND-V".
Routers / Switches
Network routing and switching equipment, including the router business taken over from PFU in 2002.
Smart-meter communication units
Communication units for smart meters, manufactured since 2010.
Network equipment kitting service
Kitting services for network equipment, operated as the Minami-Alps Network Workshop since 2017.
Electronic circuit board assembly and prototyping
Design and prototyping of electronic circuit board assemblies and electronic circuit devices.
Sources5 sources
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