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Nokia blasts 250 Gbps across Atlantic in optical test for Facebook
Wednesday, 22 March 2017 15:58

Nokia has lit up a trans-Atlantic fibre for Facebook, in a field trial that showed off 200 Gbps and 250 Gbps wavelengths on a 5,500 km link.

According to Nokia, applying a technique from Bell Labs called probabilistic constellation shaping (PCS) yielded a 2.5x increase in the rated capacity of the New York-Ireland cable used in the test.

PCS was combined with low-linewidth lasers and tricks to compensate for nonlearity in the fibre, to achieve spectral efficiency of 7.46 bits per second per Hertz in the 64-QAM transmissions.

PCS works by changing how QAM (quadrature amplitude modulation) works.

“Constellation” refers

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Oz companies fume as Enetica outage enters its second day
Saturday, 25 March 2017 02:17

Australian web service firm Enetica has provoked consternation among customers frustrated about a prolonged outage now entering its second day.

Enetica 's web hosting and domain/DNS service have been down with limited intermittent availability at best since Thursday.

The latest updates from Webcity, Enetica's parent firm, suggest techies have isolated the problem down to hardware failure. "We are currently implementing replacement equipment and in the process of deploying it," an update to Webcity's official support account on Twitter said on Friday. Support staff had earlier suggested a network outage was behind the problem in between apologising to customers and trying

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Cheap Smarthome Gadget(s) Hacked into Zigbee Sniffer
Tuesday, 28 March 2017 17:00

French hacker [akila] is building up a home automation system. In particular, he’s been working with the “SmartHome” series of gadgets made by Chinese smartphone giant, Xiaomi. First, he started off by reverse-engineering their very nicely made temperature and humidity sensor. (Original in French, hit the translate button in the lower right.) With that under his belt, he opened up the PIR motion sensor unit to discover that it has the same debugging pinouts and the same processor. Almost too easy.

For a challenge, [akila] decided it was time to implement something useful in one of these gadgets: a ZigBee …read more

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Shine on, you crazy Eind minds: Boffins fire out 43Gbps infrared 'Wi-Fi'
Saturday, 18 March 2017 19:04

In five years or so, Wi-Fi access points could carry data at rates 100 times faster than today using infrared light rather than other portions of the electromagnetic spectrum.

Researchers at Eindhoven University of Technology (TU/e) in the Netherlands have developed a way to use fiber optic cables, mounted with networking hardware in a room, to shine data directly to devices using harmless infrared light.

The researchers managed to achieve speeds of 42.8 Gbit/s over a distance of 2.5 metres (8.2 feet) with this technique. That's about 2,000 times faster than average Wi-Fi speeds in the Netherlands (~17.6 Mbit/s) and

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A router with a fear of heights? Yup. It's a thing
Monday, 20 March 2017 11:02
Cisco ASR 920 with mountains

Don't take the ASR 920 Series Aggregation Services Routers skiing and no-one gets hurt

Cisco's let users of its ASR 920 Series Aggregation Services Routers know they've got a fear of heights.

In one of the odder field notices The Register can recall, Switchzilla has revealed that “AC Power Supplies (A920-PWR400-A) shipped between September 2015 and May 2016 are only compliant for usage in elevations up to 2000 meters.”

Cisco says the ASR 920 is aimed at triple-play services and is “... optimized for remote access and smaller aggregation sites where a full-featured, small-footprint, converged platform is needed.”

And that's

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Ask Hackaday: Frequency Hopping on the nRF24l01+?
Wednesday, 22 March 2017 05:01

We’ve seen a lot of hacks with the nRF24l01+ 2.4 GHz radio modules. The tiny chips pack a lot of bang for the buck. Since the radios can switch frequencies relatively quickly, [Shubham Paul] decided to take advantage of this feature to make a rudimentary frequency-hopping communications channel.

The code is actually incredibly simple. Both the transmitter and receiver simply scan up and down over the defined channels. Because the clock speeds of any given pair of Arduinos are likely to be slightly different, it’s not a surprise that the radios eventually drift out of sync. Right now, as a …read more

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