was a principal subsidiary of the Marconi Corporation plc and was formerly known as GEC Plessey Telecommunications (GPT)
. The company was a world leading telecommunications manufacturer. The company is now jointly owned by Siemens and The Gores Group.
The General Electric Company (GEC) attempted a takeover of Plessey
The Plessey Company plc was a British-based international electronics, defence and telecommunications company. It originated in 1917, growing and diversifying into electronics. It expanded after the second world war by acquisition of companies and formed overseas companies...
in 1986 but was barred by regulatory authorities. Instead on 1 April 1988 GEC and Plessey merged their telecommunications businesses as GEC Plessey Telecommunications
, commonly known as GPT. GPT was a world leader in many fields, for example Synchronous Digital Hierarchy
Synchronous Optical Networking and Synchronous Digital Hierarchy are standardized multiplexing protocols that transfer multiple digital bit streams over optical fiber using lasers or highly coherent light from light-emitting diodes . At low transmission rates data can also be transferred via an...
(SDH) technology, and this brought the two companies responsible for developing and building the System X telephone exchange
System X was the name of the UK's first national digital telephone exchange system.-Development:System X was developed by the UK Post Office , GEC, Plessey, and Standard Telephones and Cables and first shown in public in 1979 at the Telecom 79 exhibition in Geneva Switzerland...
together, which was supposed to make selling System X simpler.
In 1989 GEC and Siemens acquired the Plessey Company through the joint company GEC Siemens plc. While most of Plessey was divided between the companies GPT remained a joint venture, with a 60/40 shareholding between GEC and Siemens respectively. GEC Plessey Telecommunications officially renamed itself GPT
(no longer standing for anything) because Plessey no longer existed (except Plessey Semiconductors retained its name).
In October 1997 in the UK, the name GPT disappeared and the company was called SGCS (Siemens GEC Communication Systems). A year later SGCS merged with SBCS (Siemens Business Communication Systems) to form Siemens Communications Ltd.
In August 1998 GEC acquired Siemens' 40% stake in GPT and merged with the telecoms units of its Italian subsidiary Marconi SpA, GEC Hong Kong and ATC South Africa to form Marconi Communications.
At present, a "carve out" process is in effect, and the company is now known as Siemens Enterprise Communications Ltd. It is widely expected that Siemens will announce a new partner for SECL on October 1 2006.
SECL later became known as SEN
In March 2008, Siemens sold 51% of SEN to The Gores Group.
The name 'Siemens' is still used, although in 2010, SEN will be re-branded to be called "New Name"-Siemens
In March 1999 GEC added RELTEC, a telecommunication network and access products manufacturer, to Marconi Communications. In April FORE Systems
FORE Systems was a computer network switching equipment company based in Pittsburgh, Pennsylvania. The company is now part of Ericsson.-History:...
was added to the group. Until the collapse of the Marconi group in 2001 the $4.5Bn company was a major supplier of Asynchronous Transfer Mode, Gigabit Ethernet and Internet Protocol products.
In September of 2000, Marconi announced the formation of global Technology Centers. The ‘Centers’ were charged with speeding delivery of best-in-breed solutions to Marconi's clients and with enabling quicker time-to-market development of new solutions across all Marconi business platforms,.
The three Enterprise Technology Centers were based in San Jose, California; Vienna Virginia; and Israel. The San Jose Technology Center, which had been responsible for management of Marconi's Gigabit Ethernet solutions, broadened its research focus to include development of application-oriented platforms, connection-oriented uplinks between connection and connectionless networks, deep-packet inspection solutions and predictable quality of service. The center in Israel concentrated its research and development on AI-based network behavior and the Virginia center focused on AI-based network management.