Fiber-Optic Link Around the Globe
Logo from 2003
Fiber-Optic Link Around the Globe (FLAG) is a 28,000-kilometer-long optical fiber mostly-submarine communications cable that connects the United Kingdom, Japan, and many places in between. The cable is operated by India's Reliance Globalcom (renamed from Flag Telecom when it became a fully owned subsidiary of Reliance Communications). The system runs from the eastern coast of North America to Japan. Its Europe-Asia segment was the fourth longest cable in the world in 2008.
- 1 Description
- 2 Segments and landing points
- 3 Disruptions
- 4 See also
- 5 References
- 6 External links
The FLAG cable system was first placed into commercial service in late 1997. FLAG offered a speed of 10 Gbit/s and uses synchronous digital hierarchy technology. It carries over 120,000 voice channels via 27,000 km of mostly undersea cable. FLAG uses erbium-doped fiber amplifiers and was jointly supplied by AT&T Submarine Systems and KDD-Submarine Cable Systems. Its design, development, installation and service conformed to ISO 9000 quality standards. FLAG provided a link between the European end of high-density transatlantic crossings and the Asian end of the transpacific crossings.
FLAG includes undersea cable segments and two terrestrial crossings. The segments can be either direct point-to-point links or multipoint links which are attained through branching units. At each cable landing point, a FLAG cable station is located. The total route length exceeds 27,000 km and comprises 1,020 km of terrestrial crossings. Approximately 6,600 km of the submerged cable is buried 1 m below the sea bed. Cable burial was performed by either a submersible plough as the cable was laid or jetting the laid cable into the sea bed via remotely operated vehicles (ROVs).
Over several years the route evolved as new branches and feeder systems were considered and realized. FLAG includes two terrestrial crossings, one in Egypt and the other in Thailand. Each of these land crossings is totally duplicated on fully different routes. As a result, any fault within one route will cause automatic protection switching to the other route within a time period of less than 50 ms.
Like other global undersea networks, FLAG uses erbium-doped fibre amplifiers. EDFAs boost the optical signals instead of the optical/electrical conversion which is generally used in regenerative technology. These optical amplifiers use short, gain-specific lengths of fibre which are doped with erbium ions and spliced in-line with the transmission fibre. The signal power is amplified by pumping the erbium-doped fibre (EDF) with 1,480 nm laser light which is attached through an optical coupler. The majority of the repeater components are passive. These include EDF, fused-fibre optical couplers and optical isolators. Active components include laser pump assemblies and associated controls. The total number of components within the repeater is lesser than that of regenerative systems.
The FLAG terrestrial crossings do not contain repeaters for reliability reasons. The terminal stations in land crossings use optical amplifiers, high performance transmitter/receivers and forward error correction to cross the large distances without repeaters. Amplification at the terminal output provides output signal power as high as +17 dBm, and optical amplification at the receiver improves the receiver sensitivity as high as +8 dBm.[clarification needed]
The route between Alexandria and Cairo is 223 km long and hence requires remote pumping in order to meet performance requirements. Remotely pumped amplifiers can be regarded as repeaters without active modules. This technology comprises short lengths of EDF spliced into the land cable. The erbium-doped sections are situated within the cable span and are pumped by 1,480 nm pump lasers which are based at the station.
Segments and landing points
Landing points are:
- Porthcurno / Skewjack, Cornwall, England, UK
- Estepona, Málaga, Andalusia, Spain
- Palermo, Province of Palermo, Sicily, Italy
- Alexandria, Al Iskandariyah Governorate, Egypt
- Cairo, Egypt
- Suez, As Suways Governorate, Egypt
- Aqaba, Aqaba Governorate, Jordan
- Jeddah, Makkah Province, Saudi Arabia
- Fujairah, United Arab Emirates
- Mumbai, Maharashtra, India
- Penang, Malaysia, meeting SAFE and SEA-ME-WE 3
- Satun, Satun Province, Thailand
- Songkhla, Songkhla province, Thailand
- Silvermine Bay, Lantau Island, Hong Kong, China
- Nanhui, Shanghai, China
- Keoje, South Gyeongsang Province, South Korea
- Ninomiya, Kanagawa Prefecture, Japan
- Miura, Kanagawa, Kanagawa Prefecture, Japan
The FLAG Atlantic 1 (FA-1) segment became operational in June 2001. It was constructed as a joint venture between a FLAG Atlantic subsidiary of the parent company FLAG Telecom Holdings, and GTS Transatlantic. Alcatel Submarine Networks laid the undersea portion, and the entire cost was estimated at $1.1 billion.
- New York City, New York, USA
- Northport, Suffolk County, New York, USA
- Island Park, Nassau County, New York, USA
- Porthcurno / Skewjack, Cornwall, England, UK
- London, England, UK
- Plérin, Côtes-d'Armor, Brittany, France
- Paris, France
FLAG Alcatel-Lucent Optical Network (FALCON)
- Suez, As Suways Governorate, Egypt
- Aqaba, Jordan
- Jeddah, Makkah Province, Saudi Arabia
- Port Sudan, Sudan
- Al Hudaydah, Yemen
- Al Ghaydah, Yemen
- Al Seeb, Muscat, Oman
- Khasab, Oman
- Dubai, United Arab Emirates
- Sumaisma, Doha, Qatar
- Manama, Bahrain
- Al Khobar, Saudi Arabia
- Al-Safat, Kuwait City, Kuwait
- Al-Faw, Iraq
- Bandar Abbas, Iran
- Chabahar, Iran
- Mumbai, India
There is an additional segment, listed as part of FALCON, but not directly connected. It has landing points in:
FLAG North Asia Loop (FNAL) / Tiger
- Tong Fuk, Lantau Island, Hong Kong, China
- Toucheng, Yilan County, Taiwan
- Busan, South Korea
- Wada, Awa District, Chiba Prefecture, Japan
West of Mumbai, FLAG has a capacity of 80 Gbit/s.
The segment between Hong Kong and Busan was broken by the 2006 Hengchun earthquake.
December 2006 and January 2007
The 2006 Hengchun earthquake occurred on December 26, 2006, off the southwest coast of Taiwan, disrupted Internet services in Asia, affecting many Asian countries. Financial transactions, particularly in the foreign exchange market were seriously affected as well. The aforementioned disruption was caused by damage to several submarine communications cables.
January and February 2008
On January 30, 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 cables in the Mediterranean Sea. BBC News Online reported 70% disruption in Egypt and 60% disruption in India Problems were reported in Bahrain, Bangladesh, Kuwait, Pakistan, Qatar, Saudi Arabia and United Arab Emirates. The respective contributions of the two cable systems to this blackout is unclear. Network outage graphs suggest that the two breaks occurred at 0430 and 0800 UTC.
The cause of the damage was not declared by either cable operator, but news sources speculated the damage was caused by a ship's anchor near Alexandria. According to the Agence France-Presse, the Kuwaiti government attributed 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 near Marseilles. Egypt knew of "no passing ships" near Alexandria which has restricted waters.
On December 19, 2008 internet services were widely disrupted in the Middle East and in the Indian subcontinent following damage to the SEA-ME-WE 4, SEA-ME-WE 3 and FLAG FEA cables in the Mediterranean Sea.
It is not known what has caused these multiple breaks, however there was seismic activity in the Malta area shortly before the breaks were identified, although it is thought that the damage may be due to a ship's anchor or trawler net.
According to FEA Cable System of Reliance Globalcom, the failure lay between Alexandria and Palermo. Reliance Globalcom completed the repair on the FLAG EUROPE ASIA (FEA) cable on December 29, 2008, at 14:15 GMT. Customer services that were affected due to the cable cut have been restored back normal with the completion of repairs.
In 2014 it was revealed that Skewjack was the location of the Government Communications Headquarters interception point on the Reliance Communications international fiber link, copying data to GCHQ Bude as part of GCHQ's Mastering the Internet project.
- Reach North Asia Loop (RNAL), cable network developed jointly by Reach Global Services and FLAG Telecom.
- List of international submarine communications cables
Other cable systems following a substantially similar route to FLAG Europe-Asia (FEA) are:
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