South East Asia–Middle East–Western Europe 4' (SEA-ME-WE 4) is an optical fibre submarine communications cable system that carries telecommunications between Singapore, Malaysia, Thailand, Bangladesh, India, Sri Lanka, Pakistan, United Arab Emirates, Saudi Arabia, Sudan, Egypt, Italy, Tunisia, Algeria and France. It is intended to be a complement to, rather than a replacement for, the SEA-ME-WE 3 cable.
Network topology 
- Landing points
The SEA-ME-WE 4 cable system was developed by a consortium of 16 telecommunications companies which agreed to construct the project on 27 March 2004. Construction of the system was carried out by Alcatel Submarine Networks (now Alcatel-Lucent Submarine Networks, a division of Alcatel-Lucent) and Fujitsu. The eighteen month construction project was completed on 13 December 2005 with a cost estimate of US$500 million. Segment 1 construction, running 8,000 kilometres from Singapore to India, was done by Fujitsu, which also provided the submarine repeater equipment for Segment 4.
30 January 2008 
On 30 January 2008, Internet services were widely disrupted in the Middle East and in the Indian subcontinent following damage to the SEA-ME-WE 4 and FLAG Telecom cables in the Mediterranean Sea. Disruptions of 70 percent in Egypt, and 60 percent in India were reported along with problems in Bahrain, Bangladesh, Kuwait, Pakistan, Qatar, Saudi Arabia and United Arab Emirates. In India, small users felt the impact while ISPs could service large users who have more lucrative contracts.
While the respective contributions of the two cable systems to this blackout is unclear, network outage graphs show anomalies at 0430 UTC and again at 0800 UTC. The FALCON submarine communications cable was reported severed off the coast of Dubai in the Persian Gulf on 1 February 2008, making it the third over a two-day period.
Though the cause of the damage to SEA-ME-WE 4 or FLAG has not been declared by either cable operator and 12 hours of video before and after the incident show no ships being in the area, a number of sources speculate these were caused by a ship's anchor near Alexandria, while the Kuwait government attributes the breaks to "weather conditions and maritime traffic". The New York Times reported that the damage occurred to the two systems separately near Alexandria and Marseilles. The water near Alexandria is restricted and Egypt knew of "no passing ships" at the time.
For a number of days, SEA-ME-WE 3 was the only remaining cable connecting Europe to the Middle East via Egypt. Data transmission capacity between India and Europe was reduced by 75 percent, causing much of the traffic between these sites to be rerouted through the Pacific and Atlantic Oceans.
19 December 2008 
April 14, 2010 shunt fault 
May 2010 fault 
Another cable fault which connects Malaysia via Mumbai to Europe.
July 5, 2010 
Services between Mumbai and Mombasa are down since 9:19 GMT/5 July 2010 Services in South Africa, All regions was also Experienced and rerouting was experienced. On Mweb's Website it stated as ADSL Outage number 8084
May 11, 2012 fault 
The submarine cable South East Asia-Middle East-Western Europe 4 (SeaMeWe-4) has reportedly been cut near Alexandria, disrupting internet services in Pakistan. Reportedly SMW4 was cut in April 2012 too, but it got restored the same day.
June 6, 2012 fault 
On this day, at around 6.30pm (GMT+8), Sea-Me-We 4 had a cut near Singapore causing disruption to voice and internet services from Singapore and Malaysia to Bangladesh. Service disruption affected the eastern route into Bangladesh while western one is not affected. 
Nov 15-20, 2012 fault 
Over this week, Eastern Segment of SMW4 went down, maintenance work was performed in the eastern segment causing degraded internet in the Eastern part of the section and services were restored to normal on 20 November around 4:00PM (GMT+5). While western traffic was not affected.
Jan 17, 2013 fault 
On this day, at around 1:00PM (GMT+5), segment of SMW4 had gone down causing disruption to voice and internet services.
Jan 21-25, 2013 fault 
Over this week, maintenance work was performed between Malaysia and Thailand causing degraded internet in the Eastern part of the section. While western one is not affected.
Mar 27, 2013 fault 
A cut in the segment 4 of South East Asia-Middle East-Western Europe 4 (SEA-ME-WE 4) submarine optical fiber cable on Wednesday morning (27 March 2013) has been reported leading to a degradation of internet speed by 60% in several countries including Pakistan and Egypt. A consortium of SEA-ME-WE-4 Cable System is working on the fault but they have not come up with a resolution time for this problem and confirmed nature of fault is yet to be determined
Three men were arrested for trying to cut the cable near Alexandria.
The issue was resolved on the 8th of April 2013.
Management and administration 
The SEA-ME-WE 4 cable system was proposed and developed by the SEA-ME-WE 4 Consortium. The Consortium continues to maintain and operate the system. It comprises 16 telecommunications companies:
- Algérie Télécom, Algeria
- Bharti Infotel Limited, India
- Bangladesh Submarine Cable Company Limited (BSCCL), Bangladesh
- CAT Telecom Public Company Limited, Thailand
- Emirates Telecommunication Corporation (ETISALAT), UAE
- France Telecom - Long Distance Networks, France
- MCI, UK
- Pakistan Telecommunication Company Limited, Pakistan
- Singapore Telecommunications Limited (SingTel), Singapore
- Sri Lanka Telecom PLC (SLT), Sri Lanka
- Saudi Telecom Company (STC), Saudi Arabia
- Telecom Egypt (TE), Egypt
- Telecom Italia Sparkle S.p.A., Italy
- Telekom Malaysia Berhad (TM), Malaysia
- Tunisie Telecom, Tunisia
- Tata Communications previously Videsh Sanchar Nigam Limited (VSNL), India
The consortium is a hierarchical organisation which operates, manages and administers the cable system. At the top of the hierarchy is the Management Committee, which steers the project. Bodies subordinate to the Management Committee include the Procurement Group; Operation and Maintenance; the Financial & Administrative Subcommittee; Assignment, Routing and Restoration; and Investment and Agreement. Other bodies in the organisation are the Central Billing Party which is subordinate to the Financial & Administrative Subcommittee, and the Network Administrator which is subordinate to Assignment, Routing and Restoration.
Tata Communications previously Videsh Sanchar Nigam Limited (VSNL), India is the Network Administrator. For this purpose, Tata Comm has developed a state of the art Network Administration Software system which enables online request processing, job scheduling and report generation etc. This system will make the capacity management very efficient for bandwidth owners. This system is accessible online at http://www.seamewe4.net. Telekom Malaysia Berhad is the Central Billing Party.
SEA-ME-WE 4 is used to carry "telephone, internet, multimedia and various broadband data applications". The SEA-ME-WE 3 and the SEA-ME-WE 4 cable systems are intended to provide redundancy for each other. The two cable systems are complementary, but separate, and 4 is not intended to replace 3. Both derive from the same series of projects (SEA-ME-WE), but have different emphases. SEA-ME-WE 3 is far longer at 39,000 kilometres (compare to SEA-ME-WE 4's 18,800 kilometres) and extends from Japan and Australia along the bottom of the Eurasian landmass to Ireland and Germany. SEA-ME-WE 4 has a faster rate of data transmission at 1.28 Tbit/s against SEA-ME-WE 3's 0.96 Tbit/s. SEA-ME-WE 3 provides connectivity to a greater number of countries over a greater distance, but SEA-ME-WE 4 provides far higher data transmission speeds intended to accommodate increasing demand for high-speed internet access in developing countries.
The cable uses dense wavelength-division multiplexing (DWDM), allowing for increased communications capacity per fibre compared to fibres carrying non-multiplexed signals and also facilitates bidirectional communication within a single fibre. DWDM does this by multiplexing different wavelengths of laser light on a single optical fibre so that multiple optical carrier signals can be concurrently transmitted along that fibre. Two fibre pairs are used with each pair able to carry 64 carriers at 10 Gbit/s each. This enables terabit per second speeds along the SEA-WE-ME 4 cable, with a total capacity of 1.28 Tbit/s. In Feb 2011 the consortium awarded contracts to upgrade submarine segments capacity to 40 Gbit/s per link, along with landing sites equipment capable of 100 Gbit/s for future needs.
See also 
Several other cable systems following a substantially similar route:
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- Timmons, Heather (2008-01-31). "2 Communication Cables in the Mediterranean Are Cut". The New York Times. ISSN 0362-4331. Retrieved 2008-01-31.
- "Severed Cables in Mediterranean Disrupt Communication". Bloomberg. 2008-12-19.
- "GO submarine cable fault part of wider disruption between Italy and Egypt". Times of Malta. 2008-12-19.
- Orange.com : Corporate Website of France Telecom-Orange
- Etisalat warns of internet disruptions in UAE | GulfNews.com
- Web at a crawl as internet cable fails in Mediterranean
- Network Status Notices
- SeaMeWe-4 damage disrupts Pakistan’s internet access
- SMW4 Cut Causing Internet Disruption in Pakistan
- Under Sea Cable Cut Slows Down Internet Across Pakistan
- Undersea cable cut near Egypt slows down Internet in Africa, Middle East, South Asia — Tech News and Analysis
- loss of signal on the SMW4 capacity
- Three arrested for trying to cut undersea Internet cable - SlashGear
- "The Management Committee (MC)". South East Asia-Middle East-Western Europe 4. Sri Lanka Telecom. Archived from the original on 2007-02-10. Retrieved 2008-01-31.
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- "Home page". SMW 4 Central Billing Party (CBP). Telekom Malaysia Berhad. Archived from the original on 2007-07-07. Retrieved 2008-01-31.
- "Mediterranean Cable Break". REACH : Network. Reach Global Services Limited. Archived from the original on 2007-06-21. Retrieved 2008-02-01. Text " Overview " ignored (help)
- "Cable System Configuration". South East Asia-Middle East-Western Europe 3. Sri Lanka Telecom. Archived from the original on 2007-07-14. Retrieved 2008-02-01.
- Alcatel-Lucent, Ciena to conduct upgrades for SEA-ME-WE 4 cable system - FierceTelecom