SciBlogs

Archive January 2010

Light My Room John Nixon Jan 30

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lightwire-1
I discovered a very interesting twist in transmitting high speed data over short distances. Currently we use WiFi or Bluetooth, both using radio wavelengths which can be subject to interference, hacking etc as they penetrate to some extent walls, doors, windows.
Pennsylvania State University researchers have come up with a light-based system (infra-red) which can deliver beyond 1 Ghz of bandwidth.
Light of course will stay inside a windowless room and systems in adjacent rooms could use the same wavelength without interference.
LED lighting is becoming more and more popular and the researchers believe that this data transmission system could be incorporated into the room’s normal lighting. What it amounts to is pretty much the same as sending high speed data down a fibre optic cable, but spraying the transmissions into the air instead of down the fibre. The distances will be much shorter, but the available bandwidth extremely high.

China and Free Internet Speech John Nixon Jan 24

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158px-Flag_of_the_People's_Republic_of_China.svg

I try to avoid politics here. We live in our own countries and we deserve (dit-on) the government we elect.
But when we discuss the Internet and Next Generation Networks, we also need to discuss what goes over those networks around the world.
One interesting article about the current Google versus China debate can be found at: http://news.cnet.com/8301-30684_3-10439049-265.html?tag=nl.e496

I have visited China, like most of our readers I imagine, a few times in recent years. And of course I had a broadband internet connection in each of my hotel rooms there.
But to my surprise, always so many of my regular web sites were “unavailable”. And I’m not talking about any site that could be considered politically sensitive, or of doubtful morals.
Just so many sites, of different ilk were “unavailable” on the China mainland.
You cross the border into Hong Kong and miraculously these sites are suddenly available again.
There must be an army of “faithful” monitors who run every site through a translation program that highlights any word or phrase that smells potentially of something unwelcome to their regime. And BOOM, the site is gone!
I have many excellent Chinese friends here in New Zealand. Most have good academic qualifications, and some of them in my own field of Electronics Engineering. Technically they are great, but often still adhere to what they have been taught back home.
OK enough of politics. These people are usually great migrants for New Zealand, but I applaud Google in thumbing their nose to the rampant censorship and spying that goes on over there.
Let’s hope that the Chinese Government sees the light and opens up “their ” internet.

Visiting the satellites John Nixon Jan 02

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Greetings from New Caledonia and a very Happy New Year to all our friends and readers.

I thought that many of you would be interested to see a pictorial visit to the Verizon (USA) “Super Headend” where all the hundreds of television channels are brought together and dispatched out to their nearly 1 million Fios (FTTH) subscribers across the United States.

Verizon's satellite head-end. Source: Engadget

Verizon's satellite head-end. Source: Engadget

Yes, they use RF Overlay for their broadcast channels plus IPTV for their Video on Demand.

Just before I left Auckland to spend the festive season with my family here in Noumea, I had the opportunity to be given a detailed tour of the SKY TV headquarters in Mt Wellington (an Auckland suburb).

My enthusiastic and expert guide, Mr Wayne Tibby, took me through this quite gigantic place, which resembled closely the Verizon installations.

When you arrive by car at SKY TV, the entrance is via a narrow laneway, surrounded by brick cottages. When you drive in, you have no idea of the extent of their installations. They are perched on a flat hill-top, giving their satellite antenna farm a clear shot skywards.

Wayne explained that they had just converted to HD (high definition) transmissions, and this required a massive change-over of equipment and subsequent investment. They had also recently converted their storage from tape to disk, and their total disk capacity runs into multiple petabytes.

Well done SKY!