Japanese Internet satellite hits 1.2Gbps

The speed represents a record for satellite communications

Engineers testing a recently launched Japanese data communications satellite have succeeded in establishing a two-way Internet link running at 1.2G bps (bits per second) each way, they announced this week.

The speed represents a record for satellite communications, according to the Japan Aerospace Exploration Agency and the National Institute of Information and Communications Technology.

The tests were carried out on May 2 as part of verification of the Kizuna satellite. In the tests data was transmitted on two 622M-bps channels both up to the satellite and down to a receiving antenna. Together the combined data transmission speed was 1.2G bps.

Kizuna was launched on Feb. 23 and is intended to provide high-speed Internet links to homes and offices in remote areas, to organizations as a back-up during natural disasters and to improve regional communications links in Asia.

One of the satellite's special features is an on-board Asynchronous Transfer Mode (ATM) switch. In other satellite Internet systems data sent to the satellite has to be sent to an earth station, demodulated, switched to its destination and then remodulated and sent again via the satellite to reach its destination. With a switch onboard the satellite is capable of doing all this in space thus making more efficient use of the available frequency spectrum, according to JAXA.

Tests carried out in March and April verified uplink communications at 1.5M bps and downlink at 155M bps using a compact 45-centimeter antenna and both up and downstream at 155M bps using a larger 1.2-meter dish. At the time JAXA said the 155M-bps downlink was the fastest in the world achieved with such a small-size antenna.

Join the Good Gear Guide newsletter!

Error: Please check your email address.

Our Back to Business guide highlights the best products for you to boost your productivity at home, on the road, at the office, or in the classroom.

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Martyn Williams

IDG News Service
Show Comments

Most Popular Reviews

Latest News Articles

Resources

PCW Evaluation Team

Azadeh Williams

HP OfficeJet Pro 8730

A smarter way to print for busy small business owners, combining speedy printing with scanning and copying, making it easier to produce high quality documents and images at a touch of a button.

Andrew Grant

HP OfficeJet Pro 8730

I've had a multifunction printer in the office going on 10 years now. It was a neat bit of kit back in the day -- print, copy, scan, fax -- when printing over WiFi felt a bit like magic. It’s seen better days though and an upgrade’s well overdue. This HP OfficeJet Pro 8730 looks like it ticks all the same boxes: print, copy, scan, and fax. (Really? Does anyone fax anything any more? I guess it's good to know the facility’s there, just in case.) Printing over WiFi is more-or- less standard these days.

Ed Dawson

HP OfficeJet Pro 8730

As a freelance writer who is always on the go, I like my technology to be both efficient and effective so I can do my job well. The HP OfficeJet Pro 8730 Inkjet Printer ticks all the boxes in terms of form factor, performance and user interface.

Michael Hargreaves

Windows 10 for Business / Dell XPS 13

I’d happily recommend this touchscreen laptop and Windows 10 as a great way to get serious work done at a desk or on the road.

Aysha Strobbe

Windows 10 / HP Spectre x360

Ultimately, I think the Windows 10 environment is excellent for me as it caters for so many different uses. The inclusion of the Xbox app is also great for when you need some downtime too!

Mark Escubio

Windows 10 / Lenovo Yoga 910

For me, the Xbox Play Anywhere is a great new feature as it allows you to play your current Xbox games with higher resolutions and better graphics without forking out extra cash for another copy. Although available titles are still scarce, but I’m sure it will grow in time.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?