Misplaced Pages

Mondial House
Mondial House in June 1979
General information
Type	Telephone exchange
Location	90-94 Upper Thames Street, London, EC4 United Kingdom (EC4R 3UB)
Coordinates	51°31′N 0°05′W / 51.51°N 0.09°W / 51.51; -0.09
Construction started	March 1970
Completed	1978
Owner	Post Office Telecommunications
Height
Roof	41.4 metres (135.8 ft)
Technical details
Floor count	12
Floor area	590,000 sq ft
Design and construction
Architect(s)	Hubbard, Ford and Partners
Main contractor	Holland, Hannen & Cubitts

Mondial House was a main telecommunications hub in central London on the banks of the River Thames. It was known as an international switching centre (ISC). Built in 1978 the building was seen as controversially modern-looking. It was demolished in 2006.

History

When completed in 1978, it was the largest telephone exchange in Europe. Riverbank House was next door to the east. The architectural style was not unlike the Royal National Theatre. The International Control Centre was officially opened on 3 May 1984.

Construction

It was built on the churchyard of the former All-Hallows-the-Great on Upper Thames Street (A3211). It was built on a 2.5-acre site. It cost £18m, with £11m for the telecommunications equipment.

In September 1971, Plessey Telecommunications was given a £10m contract. It had the TXK type of switching equipment. The site was planned to open in 1975 but opened in 1978.

It was only by the mid to late 1980s that the building was fully fitted. By this time, the immense amount of analogue telecommunications equipment being fitted was becoming obsolete.

Closure

BT closed the site on 31 December 2004. It was demolished in August 2006.

Watermark Place

City Office Retail Estates and Oxford Properties co-developed the old Mondial House site with a mixed-use complex designed by Fletcher Priest Architects. The building now known as "Watermark Place" began construction in 2007 and was completed in 2009. The complex is located along the Thames between Cannon Street station and Fishmonger Hall.

Function

In 1970, Britain had around 30 million international calls a year, with 38 million by 1971. By 1975, when it was planned to open, Britain was expected to have around 70 million international calls a year. Mondial House on opening could connect around 23 million calls a year, and 200,000 calls an hour on 20,000 international lines. The exchange opened in 1980.

Phone calls originating in the UK would often travel via Mondial House to the BT Tower.

See also

• National Network Management Centre

References

1. Emporis
2. "Watermark Place, London".
3. "BT 1980". Archived from the original on 25 April 2017. Retrieved 24 April 2017.

External links

• Connected Earth Archived 25 April 2017 at the Wayback Machine
• Documents showing the architect's initial ideas for the building Archived 25 April 2017 at the Wayback Machine
• RIBApix
• Landmark

v t e BT Group
Divisions and subsidiaries	Current BT Consumer BT Business and Public Sector BT Global Services BT Wholesale and Ventures BT Research Openreach EE Plusnet BT Ireland BT Italia Former BT Marine dabs.com Hibu Madasafish merged into Plusnet Manx Telecom O2 (UK) O2 (Ireland) O2 (Germany) Ribbit Concert Communications Services Telecomsoft Tymnet International Network Services Dialcom Telfort LineOne Swindon Cable 6GMOBILE Open....
Products and services	Current BT Broadband EE Broadband EE Mobile EE TV EE WiFi BT Smart Hub TNT Sports Defunct BT Fusion BT Highway BT Mobile BT Superfast Fibre BT Versatility BT Voyager BT MyDonate BT MyPlace Telecom Gold Micronet 800 Merlin M4000
Buildings and facilities	Current Adastral Park Baynard House BT Centre BT Tower (London) BT Tower (Birmingham) BT Tower (Swansea) BT Riverside Tower Stadium House Charwelton BT Tower Faraday Building Goonhilly Cornwall Guardian Exchange Manchester Madley Communications Centre National Network Management Centre Peterborough transmitting station Zouches Farm transmitting station Heaton Park BT Tower Purdown BT Tower Pye Green BT Tower Stokenchurch BT Tower Sutton Common BT Tower Tinshill BT Tower Tolsford Hill BT Tower Wotton-under-Edge BT Tower Red telephone box KX telephone boxes LinkUK Former Anchor telephone exchange Bletchley Park CS Sovereign Horwood House Kingsway telephone exchange Leafield Technical Centre Mondial House Stag Lane Aerodrome Marland House Sheffield Telephone House Post Office Research Station Portishead Radio Criggion Radio Station Rugby Radio Station Microwave network TAT-1 TAT-8 TAT-9 TAT-14 CANTAT-2 SAT-2 UK-Belgium 5
Programmes and standards	Current BT 21CN BT site engineering code BT Speaking Clock British telephone socket Cable jetting Customer Service System Advanced Mobile Location Digital Access Carrier System Digital Access Signalling System 2 System X System Y ADSL Max Redcare 1-5-7-1 YouView Defunct Digital Access Signalling System 1 Digital Private Network Signalling System Fixed-Mobile Convergence Alliance Go!Messenger International Packet Switched Service NHSnet N3 (NHS) Packet Switch Stream Prestel TXE TXK
History	BT Group General Post Office Electric Telegraph Company
Other	BT Archives BT Museum BT Digital Music Awards BT Sport Action Woman Awards Buzby Connected Earth People Young Scientist and Technology Exhibition British Telecommunications plc v. Prodigy
Category Commons

• British Telecom buildings and structures
• Buildings and structures demolished in 2006
• Former buildings and structures in the City of London
• Former structures on the River Thames
• History of telecommunications in the United Kingdom
• Modernist architecture in London
• Telephone exchange buildings
• Ziggurat style modern architecture
• Demolished buildings and structures in London