GEC Plessey Telecommunications

GEC Plessey Telecommunications

Company type	Joint venture
Industry	Telecommunications equipment
Founded	1988
Founder	GEC and Plessey
Defunct	1998
Fate	Integrated into Siemens Communications
Headquarters	United Kingdom
Products	System X telephone switching system, Synchronous Digital Hierarchy (SDH) equipment
Number of employees	25,000

GEC Plessey Telecommunications (GPT) was a prominent British manufacturer specializing in telecommunications equipment, notably recognized for the System X telephone switching system. Established in 1988 as a collaborative venture between GEC and the British electronics and defense corporation Plessey, GPT transitioned in 1989 into a 60/40 partnership between GEC and German industrial giant Siemens following their joint acquisition of Plessey. The GPT brand gradually vanished by the mid-1990s, culminating in its integration into Siemens Communications in 1998.

Origins

GPT's inception traces back to GEC's 1986 bid to acquire Plessey, a longstanding British multinational engaged in electronics, defense, and telecommunications since 1917. The takeover was impeded by regulatory constraints, prompting the companies to merge their telecommunications sectors on 1 April 1988, resulting in GPT with a workforce of approximately 25,000. This alliance united the creators of the System X exchange and bolstered GPT’s expertise in technologies like Synchronous Digital Hierarchy (SDH).

GEC/Siemens partnership: 1989–1998

In 1989, GEC and Siemens orchestrated a hostile acquisition of Plessey through their shared holding company, GEC Siemens plc. While most of Plessey’s assets were split between them, GPT persisted as a joint enterprise with GEC owning 60% and Siemens holding 40%. Following Plessey’s breakup, the company was rebranded simply as GPT in 1991; in France, it operated under the name GPTel due to local pronunciation preferences.

Integration into Siemens Communications

Throughout the mid-1990s, the GPT designation was phased out within the UK market. By October 1997, after several mergers and acquisitions by Siemens, the joint venture evolved into Siemens GEC Communication Systems (SGCS). The subsequent year, SGCS merged into Siemens Business Communication Systems (SBCS), which became Siemens AG’s largest division known as Siemens Communications.

Successor entities

In August 1998, GEC purchased Siemens’ 40% share in GPT—then largely a legal entity—and consolidated it with telecommunications units from Marconi SpA, GEC Hong Kong, and ATC South Africa to form Marconi Communications. Later, in December 1999, GEC’s defense division Marconi Electronic Systems merged with British Aerospace, creating BAE Systems. The remaining portion of GEC was renamed Marconi plc, with Marconi Communications serving as its main subsidiary.

Marconi concentrated on the expanding telecommunications market but encountered difficulties due to acquisitions made during the dot-com bubble, which adversely affected its performance following the bubble’s collapse in 2000/2001. On 19 May 2003, Marconi plc underwent restructuring to become Marconi Corporation plc. In 2005, failure to secure any contracts from BT's 21st Century Network (21CN) initiative led to a significant drop in share value. That year, most of Marconi Corporation’s assets—including Marconi Communications—were sold to Ericsson, while the remaining business was rebranded as Telent. This entity was voluntarily dissolved on 27 October 2006.

The division of GPT that evolved into Siemens Communications later became part of Siemens Enterprise Communications through a merger in 2008.

External links

• Archived version of the official site