107-625: Gondwana-1 is a submarine communications cable network connecting New Caledonia and Australia brought into service in mid-2008. The cable landing points are: The Australian end of the Cable was terminated in mid November 2007 by the Cable Ship Ile de Re completing the laying of the cable. The fibre optic cable is laid in the Northern Sydney Protection Zone and comes ashore at Narrabeen beach where
214-413: A battery (for example when pressing a telegraph key), the electric charge in the wire induces an opposite charge in the water as it travels along. In 1831, Faraday described this effect in what is now referred to as Faraday's law of induction . As the two charges attract each other, the exciting charge is retarded. The core acts as a capacitor distributed along the length of the cable which, coupled with
321-453: A gain of +33dBm, however again the amount of power that can be fed into the fiber is limited. In single carrier configurations the dominating limitation is self phase modulation induced by the Kerr effect which limits the amplification to +18 dBm per fiber. In WDM configurations the limitation due to crossphase modulation becomes predominant instead. Optical pre-amplifiers are often used to negate
428-421: A handful of hours. The first attempt at laying a transatlantic telegraph cable was promoted by Cyrus West Field , who persuaded British industrialists to fund and lay one in 1858. However, the technology of the day was not capable of supporting the project; it was plagued with problems from the outset, and was in operation for only a month. Subsequent attempts in 1865 and 1866 with the world's largest steamship,
535-573: A large underwater reef on the New Jersey side of the harbor. The reef was historically one of the largest oyster beds in the world and provided a staple for the diet of all classes of citizens both locally and regionally until the end of the 19th century, when the beds succumbed to pollution. Historically, it has played an extremely important role in the commerce of the New York metropolitan area . The Statue of Liberty National Monument recalls
642-687: A machine in 1837 for covering wires with silk or cotton thread that he developed into a wire wrapping capability for submarine cable with a factory in 1857 that became W.T. Henley's Telegraph Works Co., Ltd. The India Rubber, Gutta Percha and Telegraph Works Company , established by the Silver family and giving that name to a section of London , furnished cores to Henley's as well as eventually making and laying finished cable. In 1870 William Hooper established Hooper's Telegraph Works to manufacture his patented vulcanized rubber core, at first to furnish other makers of finished cable, that began to compete with
749-428: A public dispute with William Thomson . Whitehouse believed that, with enough voltage, any cable could be driven. Thomson believed that his law of squares showed that retardation could not be overcome by a higher voltage. His recommendation was a larger cable. Because of the excessive voltages recommended by Whitehouse, Cyrus West Field's first transatlantic cable never worked reliably, and eventually short circuited to
856-415: A pump laser light to be transmitted alongside the data carried by the cable; the pump light and the data are often transmitted in physically separate fibers. The ROPA contains a doped fiber that uses the pump light (often a 1480 nm laser light) to amplify the data signals carried on the rest of the fibers. WDM or wavelength division multiplexing was first implemented in submarine fiber optic cables from
963-408: A single fiber using wavelength division multiplexing (WDM), which allows for multiple optical carrier channels to be transmitted through a single fiber, each carrying its own information. WDM is limited by the optical bandwidth of the amplifiers used to transmit data through the cable and by the spacing between the frequencies of the optical carriers; however this minimum spacing is also limited, with
1070-407: A solid-state optical amplifier , usually an erbium-doped fiber amplifier (EDFA). Each repeater contains separate equipment for each fiber. These comprise signal reforming, error measurement and controls. A solid-state laser dispatches the signal into the next length of fiber. The solid-state laser excites a short length of doped fiber that itself acts as a laser amplifier. As the light passes through
1177-405: A submarine cable can have a major impact in its capacity. SDM is combined with DWDM to improve capacity. The open cable concept allows for the design of a submarine cable independently of the transponders that will be used to transmit data through the cable. SLTE (Submarine Line Terminal Equipment) has transponders and a ROADM ( Reconfigurable optical add-drop multiplexer ) used for handling
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#17327938075081284-481: A typical multi-terabit, transoceanic submarine cable system costs several hundred million dollars to construct. As a result of these cables' cost and usefulness, they are highly valued not only by the corporations building and operating them for profit, but also by national governments. For instance, the Australian government considers its submarine cable systems to be "vital to the national economy". Accordingly,
1391-470: A wire, insulated with tarred hemp and India rubber , in the water of New York Harbor , and telegraphed through it. The following autumn, Wheatstone performed a similar experiment in Swansea Bay . A good insulator to cover the wire and prevent the electric current from leaking into the water was necessary for the success of a long submarine line. India rubber had been tried by Moritz von Jacobi ,
1498-780: Is connected to Lower New York Bay by the Narrows , to Newark Bay by the Kill Van Kull , and to Long Island Sound by the East River , which, despite its name, is actually a tidal strait . It provides the main passage for the waters of the Hudson River as it empties through the Narrows. The channel of the Hudson as it passes through the harbor is called the Anchorage Channel and is approximately 50 feet deep in
1605-480: Is either not required, the capacity to the country is small enough to be backed up by other means, or having backup is regarded as too expensive. A further redundant-path development over and above the self-healing rings approach is the mesh network whereby fast switching equipment is used to transfer services between network paths with little to no effect on higher-level protocols if a path becomes inoperable. As more paths become available to use between two points, it
1712-725: Is enclosed by the New York City boroughs of Manhattan , Brooklyn , and Staten Island and the Hudson County, New Jersey municipalities of Jersey City and Bayonne . The name may also refer to the entirety of New York Bay including Lower New York Bay . The harbor is fed by the waters of the Hudson River (historically called the North River as it passes Manhattan ), as well as the Gowanus Canal . It
1819-813: Is held that the Gambino crime family controlled the New York waterfront and the Genovese crime family controlled the New Jersey side. In 1984 the Teamsters local was put under Racketeer Influenced and Corrupt Organizations Act (RICO) trusteeship, and in 2005 a similar suit was brought against the International Longshoremen's Association local. In March 2006, the Port passenger facility
1926-590: Is less likely that one or two simultaneous failures will prevent end-to-end service. As of 2012, operators had "successfully demonstrated long-term, error-free transmission at 100 Gbps across Atlantic Ocean" routes of up to 6,000 km (3,700 mi), meaning a typical cable can move tens of terabits per second overseas. Speeds improved rapidly in the previous few years, with 40 Gbit/s having been offered on that route only three years earlier in August 2009. Switching and all-by-sea routing commonly increases
2033-595: Is limited, although this has increased over the years; in 2014 unrepeated cables of up to 380 kilometres (240 mi) in length were in service; however these require unpowered repeaters to be positioned every 100 km. The rising demand for these fiber-optic cables outpaced the capacity of providers such as AT&T. Having to shift traffic to satellites resulted in lower-quality signals. To address this issue, AT&T had to improve its cable-laying abilities. It invested $ 100 million in producing two specialized fiber-optic cable laying vessels. These included laboratories in
2140-409: Is much healthier than it was 30 years ago." The Port of New York and New Jersey is the largest oil importing port and third largest container port in the nation. The commercial activity of the port of New York City, including the waterfronts of the five boroughs and nearby cities in New Jersey, since 1921 has been formalized under a single bi-state Port Authority of New York and New Jersey . Since
2247-476: Is the U.S. Customs "green lane" program, in which trusted shippers have fewer containers inspected, providing easier access for contraband material. The water quality in New York Harbor has been affected by centuries of shipping activity, industrial development and urbanization . Water pollution from these sources has been a constant phenomenon, although there have been improvements in some areas of
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#17327938075082354-694: Is too small to be commercially viable. Some have been used as scientific instruments to measure earthquake waves and other geomagnetic events. In 1942, Siemens Brothers of New Charlton , London, in conjunction with the United Kingdom National Physical Laboratory , adapted submarine communications cable technology to create the world's first submarine oil pipeline in Operation Pluto during World War II . Active fiber-optic cables may be useful in detecting seismic events which alter cable polarization. In
2461-552: The Australian Communications and Media Authority (ACMA) has created protection zones that restrict activities that could potentially damage cables linking Australia to the rest of the world. The ACMA also regulates all projects to install new submarine cables. Submarine cables are important to the modern military as well as private enterprise. The US military , for example, uses the submarine cable network for data transfer from conflict zones to command staff in
2568-673: The Australian Overland Telegraph Line in 1872 connecting to Adelaide, South Australia and thence to the rest of Australia. Subsequent generations of cables carried telephone traffic, then data communications traffic. These early cables used copper wires in their cores, but modern cables use optical fiber technology to carry digital data , which includes telephone, Internet and private data traffic. Modern cables are typically about 25 mm (1 in) in diameter and weigh around 1.4 tonnes per kilometre (2.5 short tons per mile; 2.2 long tons per mile) for
2675-743: The Crimean War various forms of telegraphy played a major role; this was a first. At the start of the campaign there was a telegraph link at Bucharest connected to London. In the winter of 1854 the French extended the telegraph link to the Black Sea coast. In April 1855 the British laid an underwater cable from Varna to the Crimean peninsula so that news of the Crimean War could reach London in
2782-698: The North Pacific Cable system was the first regenerative system (i.e., with repeaters ) to completely cross the Pacific from the US mainland to Japan. The US portion of NPC was manufactured in Portland, Oregon, from 1989 to 1991 at STC Submarine Systems, and later Alcatel Submarine Networks . The system was laid by Cable & Wireless Marine on the CS Cable Venture . Transatlantic cables of
2889-758: The Prussian electrical engineer , as far back as the early 19th century. Another insulating gum which could be melted by heat and readily applied to wire made its appearance in 1842. Gutta-percha , the adhesive juice of the Palaquium gutta tree, was introduced to Europe by William Montgomerie , a Scottish surgeon in the service of the British East India Company . Twenty years earlier, Montgomerie had seen whips made of gutta-percha in Singapore , and he believed that it would be useful in
2996-533: The Rhine between Deutz and Cologne . In 1849, Charles Vincent Walker , electrician to the South Eastern Railway , submerged 3 km (2 mi) of wire coated with gutta-percha off the coast from Folkestone , which was tested successfully. In August 1850, having earlier obtained a concession from the French government, John Watkins Brett 's English Channel Submarine Telegraph Company laid
3103-753: The SS Great Eastern , used a more advanced technology and produced the first successful transatlantic cable. Great Eastern later went on to lay the first cable reaching to India from Aden, Yemen, in 1870. From the 1850s until 1911, British submarine cable systems dominated the most important market, the North Atlantic Ocean . The British had both supply side and demand side advantages. In terms of supply, Britain had entrepreneurs willing to put forth enormous amounts of capital necessary to build, lay and maintain these cables. In terms of demand, Britain's vast colonial empire led to business for
3210-599: The Southern Cross Cable and Australia-Japan Cable are also laid. The system was officially brought into service in September 2008. Gondwana drastically boosted the capacity of the New Caledonia international gateway and decreased the latency to reach Australia and Western Europe, previously handicapped by a 700 ms round trip delay between Australian and Caledonian satellite teleport . It offers
3317-469: The steel wire armouring gave pests a route to eat their way in. Damaged armouring, which was not uncommon, also provided an entrance. Cases of sharks biting cables and attacks by sawfish have been recorded. In one case in 1873, a whale damaged the Persian Gulf Cable between Karachi and Gwadar . The whale was apparently attempting to use the cable to clean off barnacles at a point where
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3424-414: The 1850s and carried telegraphy traffic, establishing the first instant telecommunications links between continents, such as the first transatlantic telegraph cable which became operational on 16 August 1858. Submarine cables first connected all the world's continents (except Antarctica ) when Java was connected to Darwin, Northern Territory , Australia, in 1871 in anticipation of the completion of
3531-672: The 1950s, the New York and Brooklyn commercial port has been almost completely eclipsed by the container ship facility at nearby Port Newark-Elizabeth Marine Terminal in Newark Bay , which is the largest such port on the Eastern Seaboard . The port has diminished in importance to passenger travel, but the Port Authority operates all three major airports, La Guardia (built 1939) and JFK/Idlewild (built 1948) in New York, and Newark (built 1928) in New Jersey. The harbor
3638-443: The 1980s, fiber-optic cables were developed. The first transatlantic telephone cable to use optical fiber was TAT-8 , which went into operation in 1988. A fiber-optic cable comprises multiple pairs of fibers. Each pair has one fiber in each direction. TAT-8 had two operational pairs and one backup pair. Except for very short lines, fiber-optic submarine cables include repeaters at regular intervals. Modern optical fiber repeaters use
3745-422: The 1990s to the 2000s, followed by DWDM or dense wavelength division mulltiplexing around 2007. Each fiber can carry 30 wavelengths at a time. SDM or spatial division multiplexing submarine cables have at least 12 fiber pairs which is an increase from the maximum of 8 pairs found in conventional submarine cables, and submarine cables with up to 24 fiber pairs have been deployed. The type of modulation employed in
3852-509: The 19th century consisted of an outer layer of iron and later steel wire, wrapping India rubber, wrapping gutta-percha , which surrounded a multi-stranded copper wire at the core. The portions closest to each shore landing had additional protective armour wires. Gutta-percha, a natural polymer similar to rubber, had nearly ideal properties for insulating submarine cables, with the exception of a rather high dielectric constant which made cable capacitance high. William Thomas Henley had developed
3959-684: The German navy's Operation Drumbeat set the top U-boat aces loose against the merchant fleet in U.S. territorial waters in January 1942, starting the Second happy time . The U-boat captains were able to silhouette target ships against the glow of city lights, and attacked with relative impunity, in spite of U.S. naval concentrations within the Harbor. Casualties included the tankers Coimbria off Sandy Hook and Norness off Long Island. New York Harbor, as
4066-499: The Harbor and explored a stretch of the river that now bears his name. His journey prompted others to explore the region and engage in trade with the local population. The first permanent European settlement was started on Governors Island in 1624, and in Brooklyn eight years after that; soon these were connected by ferry operation. The colonial Dutch Director-General of New Netherland , Peter Stuyvesant , ordered construction of
4173-464: The Narrows , the strait between Staten Island and Long Island that connects the Upper and Lower New York Bay , where he received a canoe party of Lenape. A party of his sailors may have taken on fresh water at a spring called "the watering place" on Staten Island—a monument stands in a tiny park on the corner of Bay Street and Victory Boulevard at the approximate spot—but Verrazzano's descriptions of
4280-686: The Staten Island shore. Liberty State Park opened in 1976. In recent years, it has become a popular site for recreation sailing and kayaking . The harbor is traversed by the Staten Island Ferry , which runs between Whitehall Street at the southernmost tip of Manhattan near Battery Park ( South Ferry ) and St. George Ferry Terminal on Richmond Terrace in Staten Island near Richmond County Borough Hall and Richmond County Supreme Court. NY Waterway operates routes across
4387-623: The US mainland to Hawaii in 1902 and Guam to the Philippines in 1903. Canada, Australia, New Zealand and Fiji were also linked in 1902 with the trans-Pacific segment of the All Red Line . Japan was connected into the system in 1906. Service beyond Midway Atoll was abandoned in 1941 due to World War II, but the remainder stayed in operation until 1951 when the FCC gave permission to cease operations. The first trans-Pacific telephone cable
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4494-523: The United States. Interruption of the cable network during intense operations could have direct consequences for the military on the ground. Almost all fiber-optic cables from TAT-8 in 1988 until approximately 1997 were constructed by consortia of operators. For example, TAT-8 counted 35 participants including most major international carriers at the time such as AT&T Corporation . Two privately financed, non-consortium cables were constructed in
4601-666: The amusement parks in Coney Island , Brooklyn , and the Coney Island Light , and Sandy Hook Lighthouse . The Harbor reached its peak activity in March 1943 during World War II, with 543 ships at anchor awaiting assignment to convoy or berthing (with as many as 426 seagoing vessel already at one of the 750 piers or docks). Eleven hundred warehouses with nearly 1.5 square miles (3.9 km ) of enclosed space served freight along with 575 tugboats and 39 active shipyards ,
4708-450: The bay and through The Narrows to locations near Sandy Hook . The harbor supports a very diverse population of marine species, allowing for recreational fishing, most commonly for striped bass and bluefish. The original population of the 16th century New York Harbor, the Lenape , used the waterways for fishing and travel. In 1524 Giovanni da Verrazzano anchored in what is now called
4815-466: The cable companies from news agencies, trading and shipping companies, and the British government. Many of Britain's colonies had significant populations of European settlers, making news about them of interest to the general public in the home country. British officials believed that depending on telegraph lines that passed through non-British territory posed a security risk, as lines could be cut and messages could be interrupted during wartime. They sought
4922-456: The cable descended over a steep drop. The unfortunate whale got its tail entangled in loops of cable and drowned. The cable repair ship Amber Witch was only able to winch up the cable with difficulty, weighed down as it was with the dead whale's body. Early long-distance submarine telegraph cables exhibited formidable electrical problems. Unlike modern cables, the technology of the 19th century did not allow for in-line repeater amplifiers in
5029-415: The cable was the increasing demand for advanced telecommunications such as broadband and due to the high cost of satellite bandwidth . Submarine communications cable A submarine communications cable is a cable laid on the seabed between land-based stations to carry telecommunication signals across stretches of ocean and sea. The first submarine communications cables were laid beginning in
5136-442: The cable, which permitted design of the equipment for accurate telegraphy. The effects of atmospheric electricity and the geomagnetic field on submarine cables also motivated many of the early polar expeditions . Thomson had produced a mathematical analysis of propagation of electrical signals into telegraph cables based on their capacitance and resistance, but since long submarine cables operated at slow rates, he did not include
5243-510: The cable. Large voltages were used to attempt to overcome the electrical resistance of their tremendous length but the cables' distributed capacitance and inductance combined to distort the telegraph pulses in the line, reducing the cable's bandwidth , severely limiting the data rate for telegraph operation to 10–12 words per minute . As early as 1816, Francis Ronalds had observed that electric signals were slowed in passing through an insulated wire or core laid underground, and outlined
5350-549: The cables in maintaining administrative communications with governors throughout its empire, as well as in engaging other nations diplomatically and communicating with its military units in wartime. The geographic location of British territory was also an advantage as it included both Ireland on the east side of the Atlantic Ocean and Newfoundland in North America on the west side, making for the shortest route across
5457-401: The cause to be induction, using the analogy of a long Leyden jar . The same effect was noticed by Latimer Clark (1853) on cores immersed in water, and particularly on the lengthy cable between England and The Hague. Michael Faraday showed that the effect was caused by capacitance between the wire and the earth (or water) surrounding it. Faraday had noticed that when a wire is charged from
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#17327938075085564-623: The creation of a worldwide network within the empire, which became known as the All Red Line , and conversely prepared strategies to quickly interrupt enemy communications. Britain's very first action after declaring war on Germany in World War I was to have the cable ship Alert (not the CS Telconia as frequently reported) cut the five cables linking Germany with France, Spain and the Azores, and through them, North America. Thereafter,
5671-440: The current at 10,000VDC is up to 1,650mA. Hence the total amount of power sent into the cable is often up to 16.5 kW. The optic fiber used in undersea cables is chosen for its exceptional clarity, permitting runs of more than 100 kilometres (62 mi) between repeaters to minimize the number of amplifiers and the distortion they cause. Unrepeated cables are cheaper than repeated cables and their maximum transmission distance
5778-434: The current generation with one end providing a positive voltage and the other a negative voltage. A virtual earth point exists roughly halfway along the cable under normal operation. The amplifiers or repeaters derive their power from the potential difference across them. The voltage passed down the cable is often anywhere from 3000 to 15,000VDC at a current of up to 1,100mA, with the current increasing with decreasing voltage;
5885-402: The data traffic that is crossing oceans is carried by undersea cables. The reliability of submarine cables is high, especially when (as noted above) multiple paths are available in the event of a cable break. Also, the total carrying capacity of submarine cables is in the terabits per second, while satellites typically offer only 1,000 megabits per second and display higher latency . However,
5992-511: The deep-sea sections which comprise the majority of the run, although larger and heavier cables are used for shallow-water sections near shore. After William Cooke and Charles Wheatstone had introduced their working telegraph in 1839, the idea of a submarine line across the Atlantic Ocean began to be thought of as a possible triumph of the future. Samuel Morse proclaimed his faith in it as early as 1840, and in 1842, he submerged
6099-412: The development of submarine branching units (SBUs), more than one destination could be served by a single cable system. Modern cable systems now usually have their fibers arranged in a self-healing ring to increase their redundancy, with the submarine sections following different paths on the ocean floor . One reason for this development was that the capacity of cable systems had become so large that it
6206-438: The distance and thus the round trip latency by more than 50%. For example, the round trip delay (RTD) or latency of the fastest transatlantic connections is under 60 ms, close to the theoretical optimum for an all-sea route. While in theory, a great circle route (GCP) between London and New York City is only 5,600 km (3,500 mi), this requires several land masses ( Ireland , Newfoundland , Prince Edward Island and
6313-400: The effects of inductance. By the 1890s, Oliver Heaviside had produced the modern general form of the telegrapher's equations , which included the effects of inductance and which were essential to extending the theory of transmission lines to the higher frequencies required for high-speed data and voice. While laying a transatlantic telephone cable was seriously considered from the 1920s,
6420-415: The fabrication of surgical apparatus. Michael Faraday and Wheatstone soon discovered the merits of gutta-percha as an insulator, and in 1845, the latter suggested that it should be employed to cover the wire which was proposed to be laid from Dover to Calais . In 1847 William Siemens , then an officer in the army of Prussia, laid the first successful underwater cable using gutta percha insulation, across
6527-444: The fiber, it is amplified. This system also permits wavelength-division multiplexing , which dramatically increases the capacity of the fiber. EDFA amplifiers were first used in submarine cables in 1995. Repeaters are powered by a constant direct current passed down the conductor near the centre of the cable, so all repeaters in a cable are in series. Power feed equipment is installed at the terminal stations. Typically both ends share
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#17327938075086634-566: The first American drydock was completed on the East River. Because of its location and depth, the Port grew rapidly with the introduction of steamships ; and then with the completion in 1825 of the Erie Canal New York became the most important transshipping port between Europe and the interior of the United States, as well as coastwise destinations. By about 1840, more passengers and a greater tonnage of cargo came through
6741-578: The first engineer in chief. By the turn of the 20th century numerous railroad terminals lined the western banks of the North River (Hudson River) in Hudson County, New Jersey , transporting passengers and freight from all over the United States. The freight was ferried across by the competing railroads with small fleets of towboats , barges, and 323 car floats , specially designed barges with rails so cars could be rolled on. New York subsidized this service which undercut rival ports. Major road improvements allowing for trucking and containerization diminished
6848-488: The first line across the English Channel , using the converted tugboat Goliath . It was simply a copper wire coated with gutta-percha , without any other protection, and was not successful. However, the experiment served to secure renewal of the concession, and in September 1851, a protected core, or true, cable was laid by the reconstituted Submarine Telegraph Company from a government hulk , Blazer , which
6955-399: The first time: I have never seen the bay of Naples , I can therefore make no comparison, but my imagination is incapable of conceiving any thing of the kind more beautiful than the harbour of New York. Various and lovely are the objects which meet the eye on every side, but the naming them would only be to give a list of words, without conveying the faintest idea of the scene. I doubt if ever
7062-516: The first wharf on the Manhattan bank of the lower East River sheltered from winds and ice, which was completed late in 1648 and called Schreyers Hook Dock (near what is now Pearl and Broad Streets). This prepared New York as a leading port for the British colonies and then within the newly independent United States . In 1686, the British colonial officials gave the municipality control over
7169-432: The geography of the area are a bit ambiguous. It is fairly firmly held by historians that his ship anchored at the approximate location of the modern Verrazzano-Narrows Bridge 's approach viaduct in Brooklyn. He also observed what he believed to be a large freshwater lake to the north (apparently Upper New York Bay). He apparently did not travel north to observe the existence of the Hudson River. In 1609 Henry Hudson entered
7276-415: The gutta-percha cores. The company later expanded into complete cable manufacture and cable laying, including the building of the first cable ship specifically designed to lay transatlantic cables. Gutta-percha and rubber were not replaced as a cable insulation until polyethylene was introduced in the 1930s. Even then, the material was only available to the military and the first submarine cable using it
7383-513: The harbor complex in the late 20th and early 21st centuries. A 2019 study of the harbor identifies water quality trends in nine regions of the harbor, using data collected during 1996 to 2017. The Lower New York Bay region has the highest quality, due to frequent exchange of water with the Atlantic Ocean. The poorest regions are those with limited exchange of water flows: Newtown Creek , Flushing Bay and Jamaica Bay . High levels of nutrient pollution (nitrogen and phosphorus) were observed throughout
7490-472: The harbor even at slack tide. Gedney's Channel, as it came to be called, was also shorter than the previous channel, another benefit appreciated by the ship owners and the merchants they sold to. Gedney received the praise of the city, as well as an expensive silver service . In her 1832 book Domestic Manners of the Americans , Fanny Trollope wrote of her impressions upon entering New York Harbor for
7597-455: The huge sandbar, which was interrupted in a number of places by channels of fairly shallow depth: 21 feet (6.4 m) at low tide and 33 feet (10 m) at high tide. Because of the difficulty of the navigation required, since 1694, New York had required all ships to be guided into the harbor by an experienced pilot. The new channel Gedney discovered was 2 feet (0.61 m) deeper, enough of an added margin that fully laden ships could come into
7704-582: The immigrant experience during the late 19th and early 20th century. Since the 1950s, container ship traffic has been primarily routed through the Kill Van Kull to Port Newark-Elizabeth Marine Terminal , where it is consolidated for easier automated transfer to land conveyance. As a consequence, the waterfront industries of the Harbor experienced a decline leading to diverse plans for revitalization, though important maritime uses remain at Red Hook , Port Jersey , MOTBY , Constable Hook , and parts of
7811-452: The isthmus connecting New Brunswick to Nova Scotia ) to be traversed, as well as the extremely tidal Bay of Fundy and a land route along Massachusetts ' north shore from Gloucester to Boston and through fairly built up areas to Manhattan itself. In theory, using this partial land route could result in round trip times below 40 ms (which is the speed of light minimum time), and not counting switching. Along routes with less land in
7918-469: The largest being Brooklyn Navy Yard . With a large inventory of heavy equipment, this made New York Harbor the busiest in the world. Deterrence and investigation of criminal activity, especially relating to organized crime, is the responsibility of the bi-state Waterfront Commission . The commission was set up in 1953 (a year before the movie On the Waterfront ), to combat labor racketeering . It
8025-431: The late 1990s, which preceded a massive, speculative rush to construct privately financed cables that peaked in more than $ 22 billion worth of investment between 1999 and 2001. This was followed by the bankruptcy and reorganization of cable operators such as Global Crossing , 360networks , FLAG , Worldcom , and Asia Global Crossing. Tata Communications ' Global Network (TGN) is the only wholly owned fiber network circling
8132-716: The link from Dover to Ostend in Belgium, by the Submarine Telegraph Company. Meanwhile, the Electric & International Telegraph Company completed two cables across the North Sea , from Orford Ness to Scheveningen , the Netherlands. These cables were laid by Monarch , a paddle steamer which later became the first vessel with permanent cable-laying equipment. In 1858, the steamship Elba
8239-588: The major convoy embarkation point for the U.S., was effectively a staging area in the Battle of the Atlantic , with the U.S. Merchant Marine losses of 1 of 26 mariners, a rate exceeding those of the other U.S. forces. Bright city lights made it easier for German U-boats to spot targets at night, but local officials resisted suggestions that they follow London 's lead and blackout the lights of coastal cities. However, some lights were darkened, including those of
8346-698: The mammoth globe-spanning Eastern Telegraph Company , owned by John Pender . A spin-off from Eastern Telegraph Company was a second sister company, the Eastern Extension, China and Australasia Telegraph Company, commonly known simply as "the Extension." In 1872, Australia was linked by cable to Bombay via Singapore and China and in 1876, the cable linked the British Empire from London to New Zealand. The first trans-Pacific cables providing telegraph service were completed in 1902 and 1903, linking
8453-458: The midpoint of the harbor. A project to replace two water mains between Brooklyn and Staten Island, which will eventually allow for dredging of the channel to nearly 100 feet (30 m), was begun in April 2012. The harbor contains several islands including Governors Island , near the mouth of the East River, as well Ellis Island , Liberty Island , and Robbins Reef which are supported by
8560-549: The minimum spacing often being 50 GHz (0.4 nm). The use of WDM can reduce the maximum length of the cable although this can be overcome by designing equipment with this in mind. Optical post amplifiers, used to increase the strength of the signal generated by the optical transmitter often use a diode-pumped erbium-doped fiber laser. The diode is often a high power 980 or 1480 nm laser diode. This setup allows for an amplification of up to +24dBm in an affordable manner. Using an erbium-ytterbium doped fiber instead allows for
8667-427: The nearby main port of entry at Ellis Island processed 12 million arrivals from 1892 to 1954. The Statue of Liberty National Monument , encompassing both islands, recalls the period of massive immigration to the United States at the turn of the 20th century While many stayed in the region, others spread across America, with more than 10 million leaving from the nearby Central Railroad of New Jersey Terminal . After
8774-504: The need. The harbor saw major federal investment at the end of the century when Congress passed the Rivers and Harbors Act of 1899 . Over $ 1.2 million of initial funding was appropriated for the dredging of 40-foot-deep (12.2 m) channels at Bay Ridge , Red Hook , and Sandy Hook . The Statue of Liberty ( Liberty Enlightening the World ) stands on Liberty Island in the harbor, while
8881-474: The ocean when Whitehouse increased the voltage beyond the cable design limit. Thomson designed a complex electric-field generator that minimized current by resonating the cable, and a sensitive light-beam mirror galvanometer for detecting the faint telegraph signals. Thomson became wealthy on the royalties of these, and several related inventions. Thomson was elevated to Lord Kelvin for his contributions in this area, chiefly an accurate mathematical model of
8988-444: The ocean, which reduced costs significantly. A few facts put this dominance of the industry in perspective. In 1896, there were 30 cable-laying ships in the world, 24 of which were owned by British companies. In 1892, British companies owned and operated two-thirds of the world's cables and by 1923, their share was still 42.7 percent. During World War I , Britain's telegraph communications were almost completely uninterrupted, while it
9095-418: The only way Germany could communicate was by wireless, and that meant that Room 40 could listen in. The submarine cables were an economic benefit to trading companies, because owners of ships could communicate with captains when they reached their destination and give directions as to where to go next to pick up cargo based on reported pricing and supply information. The British government had obvious uses for
9202-435: The other pumping them at 1450 nm. Launching a pump frequency (pump laser light) at a power of just one watt leads to an increase in reach of 45 km or a 6-fold increase in capacity. Another way to increase the reach of a cable is by using unpowered repeaters called remote optical pre-amplifiers (ROPAs); these still make a cable count as unrepeatered since the repeaters do not require electrical power but they do require
9309-411: The pencil of Turner could do it justice, bright and glorious as it rose upon us. We seemed to enter the harbour of New York upon waves of liquid gold, and as we darted past the green isles which rise from its bosom, like guardian centinels of the fair city, the setting sun stretched his horizontal beams farther and farther at each moment, as if to point out to us some new glory in the landscape. In 1824
9416-595: The planet. New York Harbor New York Harbor is a bay that covers all of the Upper Bay and an extremely small portion of the Lower Bay . It is at the mouth of the Hudson River where it empties into New York/New Jersey Bight near the East River tidal estuary , and then into the Atlantic Ocean on the East Coast of the United States . New York Harbor is also known as Upper New York Bay , which
9523-587: The port of New York than all other major harbors in the country combined and by 1900 it was one of the great international ports. The Morris Canal carried anthracite and freight from Pennsylvania through New Jersey to its terminus at the mouth of the Hudson in Jersey City . Portions in the harbor are now part of Liberty State Park . In 1870, the city established the Department of Docks to systematize waterfront development, with George B. McClellan as
9630-488: The resistance and inductance of the cable, limits the speed at which a signal travels through the conductor of the cable. Early cable designs failed to analyse these effects correctly. Famously, E.O.W. Whitehouse had dismissed the problems and insisted that a transatlantic cable was feasible. When he subsequently became chief electrician of the Atlantic Telegraph Company , he became involved in
9737-602: The second fibre access point in South Pacific islands after Fijian access to Southern Cross cable , commissioned in 2001. The fibre optic cable is a two-part system, firstly linking New Caledonia to Australia (and then on to the world via the existing Australian fibre optic cables ) and a short unrepeated cable from New Caledonia to the Loyalty Islands , with a landing stations at Poindimie (Main island), Mouly (Ouvea) and Xepenehe (Lifou). The need for
9844-537: The ships for splicing cable and testing its electrical properties. Such field monitoring is important because the glass of fiber-optic cable is less malleable than the copper cable that had been formerly used. The ships are equipped with thrusters that increase maneuverability. This capability is important because fiber-optic cable must be laid straight from the stern, which was another factor that copper-cable-laying ships did not have to contend with. Originally, submarine cables were simple point-to-point connections. With
9951-569: The signals in the cable via software control. The ROADM is used to improve the reliability of the cable by allowing it to operate even if it has faults. This equipment is located inside a cable landing station (CLS). C-OTDR (Coherent Optical Time Domain Reflectometry) is used in submarine cables to detect the location of cable faults. The wet plant of a submarine cable comprises the cable itself, branching units, repeaters and possibly OADMs ( Optical add-drop multiplexers ). Currently 99% of
10058-613: The technology required for economically feasible telecommunications was not developed until the 1940s. A first attempt to lay a " pupinized " telephone cable—one with loading coils added at regular intervals—failed in the early 1930s due to the Great Depression . TAT-1 (Transatlantic No. 1) was the first transatlantic telephone cable system. Between 1955 and 1956, cable was laid between Gallanach Bay, near Oban , Scotland and Clarenville, Newfoundland and Labrador , in Canada. It
10165-441: The thermal noise of the receiver. Pumping the pre-amplifier with a 980 nm laser leads to a noise of at most 3.5 dB, with a noise of 5 dB usually obtained with a 1480 nm laser. The noise has to be filtered using optical filters. Raman amplification can be used to extend the reach or the capacity of an unrepeatered cable, by launching 2 frequencies into a single fiber; one carrying data signals at 1550 nm, and
10272-486: The various harbor regions, although there has been a general lowering trend in total nitrogen, and some other indicator parameters show improvements. The implementation of the Clean Water Act and related pollution control laws, along with cleanup programs and conservation measures throughout the region, have begun to yield some improvements since the 1970s. The study authors state that "the New York Harbor ecosystem
10379-545: The war, the 1919 New York City Harbor Strike by the Marine Workers Union shut down the port for weeks. It started on January 9 and was paused on January 13 for arbitration. The strike resumed March 4 after workers rejected the War Board labor ruling and ended on April 20, 1919 after new terms had been offered by both public and private port employers. After the United States entered World War II ,
10486-660: The waterfront. In 1835, Lieutenant Thomas Gedney of the Survey of the Coast (renamed the United States Coast Survey in 1836 and the United States Coast and Geodetic Survey in 1878) discovered a new, deeper channel through the Narrows into New York Harbor. Previously, the passage was complex and shallow enough that loaded ships would wait outside the harbor until high tide, to avoid running into
10593-517: The way, round trip times can approach speed of light minimums in the long term. The type of optical fiber used in unrepeated and very long cables is often PCSF (pure silica core) due to its low loss of 0.172 dB per kilometer when carrying a 1550 nm wavelength laser light. The large chromatic dispersion of PCSF means that its use requires transmission and receiving equipment designed with this in mind; this property can also be used to reduce interference when transmitting multiple channels through
10700-656: Was able to quickly cut Germany's cables worldwide. Throughout the 1860s and 1870s, British cable expanded eastward, into the Mediterranean Sea and the Indian Ocean. An 1863 cable to Bombay (now Mumbai ), India, provided a crucial link to Saudi Arabia . In 1870, Bombay was linked to London via submarine cable in a combined operation by four cable companies, at the behest of the British Government. In 1872, these four companies were combined to form
10807-548: Was inaugurated on September 25, 1956, initially carrying 36 telephone channels. In the 1960s, transoceanic cables were coaxial cables that transmitted frequency-multiplexed voiceband signals . A high-voltage direct current on the inner conductor powered repeaters (two-way amplifiers placed at intervals along the cable). The first-generation repeaters remain among the most reliable vacuum tube amplifiers ever designed. Later ones were transistorized. Many of these cables are still usable, but have been abandoned because their capacity
10914-797: Was laid from Hawaii to Japan in 1964, with an extension from Guam to The Philippines. Also in 1964, the Commonwealth Pacific Cable System (COMPAC), with 80 telephone channel capacity, opened for traffic from Sydney to Vancouver, and in 1967, the South East Asia Commonwealth (SEACOM) system, with 160 telephone channel capacity, opened for traffic. This system used microwave radio from Sydney to Cairns (Queensland), cable running from Cairns to Madang ( Papua New Guinea ), Guam , Hong Kong , Kota Kinabalu (capital of Sabah , Malaysia), Singapore , then overland by microwave radio to Kuala Lumpur . In 1991,
11021-659: Was not laid until 1945 during World War II across the English Channel . In the 1920s, the American military experimented with rubber-insulated cables as an alternative to gutta-percha, since American interests controlled significant supplies of rubber but did not have easy access to gutta-percha manufacturers. The 1926 development by John T. Blake of deproteinized rubber improved the impermeability of cables to water. Many early cables suffered from attack by sea life. The insulation could be eaten, for instance, by species of Teredo (shipworm) and Xylophaga . Hemp laid between
11128-425: Was not possible to completely back up a cable system with satellite capacity, so it became necessary to provide sufficient terrestrial backup capability. Not all telecommunications organizations wish to take advantage of this capability, so modern cable systems may have dual landing points in some countries (where back-up capability is required) and only single landing points in other countries where back-up capability
11235-536: Was to be transferred to Dubai Ports World . There was considerable security controversy over the ownership by a foreign corporation, particularly Arabic, of a U.S. port operation, this in spite of the fact the current operator was the British-based P&;O Ports , and the fact that Orient Overseas Investment Limited , a company dominated by a Chinese Communist official, has the operating contract for Howland Hook Marine Terminal . An additional concern
11342-568: Was towed across the Channel. In 1853, more successful cables were laid, linking Great Britain with Ireland , Belgium , and the Netherlands , and crossing The Belts in Denmark . The British & Irish Magnetic Telegraph Company completed the first successful Irish link on May 23 between Portpatrick and Donaghadee using the collier William Hutt . The same ship was used for
11449-477: Was used to lay a telegraph cable from Jersey to Guernsey , on to Alderney and then to Weymouth , the cable being completed successfully in September of that year. Problems soon developed with eleven breaks occurring by 1860 due to storms, tidal and sand movements, and wear on rocks. A report to the Institution of Civil Engineers in 1860 set out the problems to assist in future cable-laying operations. In
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