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Japan launchs the super speedy WINDS satellite that promises data speeds of up to a blazing 1.2 Gbps.  (Source: JAXA)
It looks like satellite internet may have the last laugh over cable

The speed increase yielded by the adoption of broadband throughout much of the U.S. today has been largely taken for granted, due to the poor quality of service.  However, for the estimated 27 million Americans who use DSL connections, the absent luxury of speed is readily apparent. 

While DSL can meet some users’ needs, the slower data speeds leave many users unhappy with the experience.  However, many subscribers in rural areas have no alternatives as cable internet infrastructure has not spread to much of the rural U.S.

A new JAXA satellite, which promises to bring rural subscribers’ connections up to speed, launched last Saturday from Japan's Yoshinobu Launch Complex at the Tanegashima Space Center.  The new satellite, named WINDS, promises "super high-speed Internet" throughout the world.  It was developed as a joint project between Japan Aerospace Exploration Agency (JAXA) and Mitsubishi Heavy Industries.

The satellite promises residential internet subscribers the ability to use small dishes to connect to the Internet many times faster than speeds current DSL or cable connections.  According to the Associated Press the satellite will provide data transmission at rates up to 1.2 Gbps.  The service will initially focus on the Asia-Pacific region, covering such high-tech giants as Japan, South Korea, Taiwan, and likely China.  However, if the service catches on, U.S. providers will be certain to want North American coverage as well.

While the massive satellite may not have the capacity to cover both Asia and North America's high speed internet needs, similar satellites should be forthcoming if needed.  JAXA meanwhile is proud to be leading the way.  In a press release, the organization plugged the satellites utility, stating, "Among other uses, this will make possible great advances in telemedicine, which will bring high-quality medical treatment to remote areas, and in distance education, connecting students and teachers separated by great distances."

It remains to be seen if American telecoms are able to use the new speedy satellite, but development certainly seems indicative of Internet connections to come.  It looks like in the world of internet satellite service may have the last laugh over land lines -- on sunny days at least.



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Uploading?
By psypher on 2/26/2008 10:26:22 AM , Rating: 3
Wasn't the biggest drawback with satellite internet connections the lack of any uploading ability?




RE: Uploading?
By StevoLincolnite on 2/26/2008 10:33:29 AM , Rating: 2
I remember a friend having a satalite connection years ago he had a 1.5mb download, and then he had to use his 56k connection as the "upload".
But there are Two-Way Satalite connections available which do both Download and Upload, but here in Australia they are expensive.


RE: Uploading?
By drank12quartsstrohsbeer on 2/26/2008 10:34:02 AM , Rating: 4
not really, that was that particular satellite companies way of doing it.
The only insurmountable problem is the latency.


RE: Uploading?
By Chris Peredun on 2/26/2008 10:37:20 AM , Rating: 5
quote:
The only insurmountable problem is the latency.


Bingo.

An average of 850ms latency, with spikes into the 1s range will make this a pretty poor choice for anything other than bulk-downloading.


RE: Uploading?
By Lord 666 on 2/26/2008 10:54:31 AM , Rating: 2
On my honeymoon and as a "proof of concept", connected over the cruise boat's satellite connection to my office using Cisco VPN client and made some calls using the Cisco Softphone.

The converstations were not the best and at times were almost like a walkie-talkie, but it did work. Sure beat the connection charge using the ship's phone service.


RE: Uploading?
By idconstruct on 2/26/2008 5:20:41 PM , Rating: 3
Hopefully this gives american cable companies the kick in the ass they deserve. I'd love to just 'catch up' to the rest of the world when it comes to standard bandwidth speeds.


RE: Uploading?
By Etsp on 2/26/2008 11:04:19 AM , Rating: 3
Any latency above 600ms is due to the infrastructure of the ISP and the technology they use. The customers of the company I work for often get 550-600ms on average. In truth, the latency due to the speed of light adds about 500ms to the transmission, anything above that is due to network overhead.


RE: Uploading?
By masher2 (blog) on 2/26/2008 11:26:22 AM , Rating: 3
> " In truth, the latency due to the speed of light adds about 500ms to the transmission"

By my calculations, 2SQRT((6K)^2 + (6K+36K)^2)/c = 283 ms.

That's a worse case scenario if you're at a pole...should be a bit less everywhere else.


RE: Uploading?
By geddarkstorm on 2/26/2008 12:26:03 PM , Rating: 5
Probably not going to be playing too much Counter Strike with those latencies. Jack Thompson would be pleased.


RE: Uploading?
By othercents on 2/26/2008 12:34:19 PM , Rating: 2
quote:
By my calculations, 2SQRT((6K)^2 + (6K+36K)^2)/c = 283 ms.

Is that both directions (IE to the satellite and from the satellite to the base station)? Is that calculated at speed of light? My understanding is that satellites do not use light to send information which would make everything slower.

500ms is probably the max based on distance, relay, and speed. This wouldn't be acceptable for anything I use.

Other


RE: Uploading?
By masher2 (blog) on 2/26/2008 12:49:17 PM , Rating: 2
> "Is that both directions "

Yes, that's what the initial factor of 2 accounts for. Satellites don't use visible light, but they do use radio waves, which travel at lightspeed.

The rest of the latency is due to switching delays in the satellite itself...a factor which can be nearly eliminated, and probably will be in newer satellites.


RE: Uploading?
By Etsp on 2/26/2008 9:23:25 PM , Rating: 3
You missed one factor if we are talking about two way satellite internet (Transmit and receive). On computers latency is usually calculated by transmitting a packet and receiving a acknowledgment.

You only took into account for the transmission of the packet.

What happens is the packet is sent from the remote antenna via satellite to the NOC, and the NOC has a landline connection to the internet. When the acknowledgment gets sent, it goes to the NOC, and the NOC sends it via satellite to the remote antenna.

That means a total of 4 trips, 2 from earth to the satellite, 2 from the satellite to earth.


RE: Uploading?
By masher2 (blog) on 2/26/2008 10:35:03 PM , Rating: 2
But TCP/IP doesn't wait for acknowledgements; it simply maintains a timer and retransmits if the ACK isn't received in time. So while acknowledgement will require the additional trips, it doesn't factor into the latency calculation.


RE: Uploading?
By Etsp on 2/27/2008 12:08:33 AM , Rating: 2
What most people consider latency in computers is essentially the result of a ping command, which by virtue of its purpose, HAS to wait for the acknowledgment.

While it is true that one of the definitions of latency is "the time from the source sending a packet to the destination receiving it"(Per wikipedia) the "round-trip"(also per Wikipedia) definition is what I, and presumably, the rest of the thread were referring to.

It's also true that TCP can transmit many packets before it receives its reply, but any individual action a user takes is to a point dependent on that reply. For example, if they open a web page, that page takes about 550ms before it starts to load from the users perspective. Same with any links they follow. This is one of the reasons why when we refer to latency on computer networks, it is usually describing a round-trip.


RE: Uploading?
By Grast on 2/27/2008 1:33:28 PM , Rating: 2
Masher,

You are incorrect. The entire TCP/IP stack relies on a three-way handshake for every communication path to a host. Of course most modern application/OS use TCP/IP windowing to allow more data to flow without the need for another handshake. However those time periods are relatively short. It also assuming that no packets get dropped at any time. If one out of order or TTL acknoledgement packet is sent to either of the hosts, the three-way handshake starts all over again. This is the reason why TCP/IP is considered a guaranteed delivery system.

In the end, the majority of packets will be following the previous describes paths. This is the reason why all current SAT system have ping times in the 800 ms.

Thanks.


RE: Uploading?
By Etsp on 2/27/2008 9:37:36 PM , Rating: 2
Not all current SAT systems have ping times near 800ms. As I stated before, My company has a lot of customers that get ping times in the 550-600 range. Yes, there can be lag spikes, but the average is normally around there. But thanks for the backup anyways =D


RE: Uploading?
By Grast on 2/26/2008 12:35:59 PM , Rating: 3
Masher,

I agree with your calculations. However, based on the frequency of the carrier transmission, the actual speed of the transmission could be slower.

Unless this new satalite is able to transmit in sub-space or some other new tech, it will be no different than the other satalites; high latency and unusable.

Limitations: 26,000 Miles above the earth

This is still the reason why 90% of the current Internet traffic is carried via undersea cables. 52,000 miles round trip versus average fiber round trip 6,000 miles.

Later....


RE: Uploading?
By masher2 (blog) on 2/26/2008 12:53:02 PM , Rating: 4
Actually, cost is the large