Africa To Lead Global Bandwidth Demand

Africa’s demand for Internet access to the rest of the world will grow by an average of 51 percent every year until 2019, ahead of all other regions, according to a forecast by research company Telegeography.

Rapid economic growth and wider Internet use will drive the increase in demand, which will be met mostly by turning on unused capacity in existing cables, according to Telegeography analyst Erik Kreifeldt. Terrestrial links are in demand partly because much of Africa still relies on satellite, which is far more expensive per bit than wired broadband, he said.

Most Internet bandwidth between continents is provided by undersea cables built and financed by groups of service providers. From Africa, most of those links go to Europe. Other carriers pay to tap into those cables and link their customers to the Internet. In some parts of Africa, running cables from coastal areas to the interior is a challenge so satellite remains the major Internet source, Kreifeldt said.

The capacity of international cables landing on African shores is just a fraction of the bandwidth available between Europe, the U.S. and Asia. After seven years of the growth that Telegeography forecasts, from 2012 through 2019, Africa will have 17.2Tbps (bits per second) of links to the outside world. That’s up from just 957Gbps in 2012 but will still be only about one-quarter of the international capacity of Latin America and less than that of Canada, according to Telegeography.

The hunger for the Internet varies among African countries. Through 2019, bandwidth demand is expected to grow fastest in Angola, at 71 percent per year; Tanzania, at 68 percent; and Gabon, at 67 percent.

Many new cables have been built to Africa and around the continent in the past several years, giving service providers excess fiber capacity that can be turned on when needed, Kreifeldt said. As that fiber gets lit up and supply rises, prices should fall for enterprises and other users in African countries, he said. However, due to relative scarcity, a given amount of bandwidth between Africa and Europe costs about 10 times as much as the same size connection between Europe and North America, he said. Africa’s bandwidth gains aren’t expected to shrink that gap.

Source

MIT Develops Inflatable Antenna

Satellites the size of shoe boxes, which are expected to one day allow researchers to explore space more efficiently, will soon have greater range.

MIT researchers have built and tested an inflatable antenna that can fold into such a satellite, then inflate in orbit to enable long range communications — from seven times the distance possible today.

The technology will let the small satellites, called CubeSats, move further into space and send valuable information to scientists back on earth.

“With this antenna, you could transmit from the moon, and even farther than that,” said Alessandra Babuscia, a researcher on the inflatable antenna team at MIT, in a statement. “This antenna is one of the cheapest and most economical solutions to the problem of communication. But all this research builds a set of options to allow the spacecraft … to fly in deep space.”

The MIT effort comes as engineers at the University of Michigan work on ways to propel such small spacecraft into interplanetary space. The team is building a plasma thruster that could fit in a 10-centimeter space and push a small satellite-bearing spacecraft into deep space.

The university researchers using superheated plasma that would push through a magnetic field to propel a CubeSat.

The MIT researchers are seeking to solve the communications problems and enable far-afield CubeSats to send data to and receive instructions from Earth.

The CubeSat devices cannot support radio dishes that are used today to let spacecraft communicate when far from Earth’s orbit.

The inflatable antennas significantly amplifies radio signals, allowing a CubeSat to transmit data back to Earth at a higher rate, according to the university.

MIT engineers have built two prototype antennae, each a meter wide, out of Mylar, which is a polyester film known for its strength and use as an electric insulator. One antenna was a cone shape, while the other looks more like a cylinder when inflated. Each fits into a 10-cubic-centimeter space within a CubeSat.

Each prototype contains a few grams of benzoic acid, which can be converted to a gas to inflate the antenna, MIT noted.

In testing, the cylindrical antenna performed “slightly better” than the cone shaped device, transmitting data 10 times faster, and seven times farther than existing CubeSat antennae.

Source

Is Iridium A Friend Of Cellular Phones?

Cellular phones squashed Iridium once, but in its second coming the satellite phone maker and owner of the biggest satellite fleet is relying on them to resurrect their business.

For all their seeming ubiquity, cellular services cover only about 8 percent of the globe, leaving large regions where the only way to communicate is to use a satphone made by Iridium Communications Inc or one of its smaller competitors.

“The need for communication devices and services where terrestrial can’t be there is rising, and as bandwidth needs increase it’s surely helping Iridium,” Macquarie Research analyst Amy Yong said.

Investors have taken notice, pushing up the stock of the company nearly 50 percent over the past eight months.

“It’s a different company, with a prudent and successful financial model,” Raymond James analyst Chris Quilty said.

“They’re growing, they have extraordinarily high barriers to entry and some of the end markets and applications they’re targeting are vast and untapped,” he said.

Unlike its competitors, Iridium’s satellite constellation covers the entire globe, including the poles, and its array of 66 satellites dwarfs the fleets of its rivals. Inmarsat Plc has 11; GlobalStar has eight and is aiming to have 32 in orbit by the year-end; Thuraya has three, with one planned.

Source…

China Denies Hack Attack

China has denied involvement in hacking US environment monitoring satellites.

Last week the US-China Economic and Security Review Commission released a draft report about several incidents where US satellites were interfered with in 2007 and 2008.

The Commission did not say that the attacks were traced back to China, but it did cite China’s military as a prime suspect, due to the similarity of the techniques used with “authoritative Chinese military writings” on disabling satellite control.

The hackers gained access to the satellites on at least four occasions through a ground station in Norway. The unauthorised access lasted for between two and 12 minutes. While the attacks did no real damage, they did demonstrate that it is possible to hijack satellites, which is a worrying realisation when military satellites are taken into consideration.

China has a bad reputation throughout the world for alleged cyber attacks, often being the first to blame when a major attack has been discovered. The US has not been the only target either, with alleged attacks against Canada and France having been reported earlier this year.

“[The US] has always been viewing China with colored lenses. This report is untrue and has ulterior motives. It’s not worth a comment,” said Hong Lei, a spokesperson for the Chinese Foreign Ministry, according to Reuters.

Source….