Red___Sword
Junior Member
ehhhh..... cautiously asking: This is humor right?
News on China's scientific and technological development.
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ehhhh..... cautiously asking: This is humor right?
Equation
Lieutenant General
Actually no. Think about it, the logistics would be an advantage towards China's defense system. Sending mass troops and supplies to a certain location is very difficult and time consuming.
Red___Sword
Junior Member
OK then, dude, what you smoke these days?
Your visualize is like to use super-luxury-cruiser to transport troops and better - rations, if possible. (Chinese joke is "to use airliner to transport bricks" "砖机")
- and, at the same time rely on totally unrelyable super-sensitive super-fragile tech and management system to do so.
OK, in light of the rising potential that if the idea of underground railway system that "image" the one on the ground, to secretly transport military related staff and stuff, is not a bad idea - but why 500km/h? why the safety (and reliability) hassle it brings along? Can't we simply use "green wagon" and flat top like what the PLA done on the ground?
Martian
Senior Member
Huawei Unveils Industry’s First Giga DSL Prototype
Huawei Smart AX M5300. The Smart AX MA5300 platform has been instrumental to Huawei's success in the global DSLAM (digital subscriber line access multiplexer) market, but the MA5600 series, designed to support more bandwidth-intensive services such as triple/quad play, is the company's flagship DSLAM.
"Huawei Unveils Industry’s First Giga DSL Prototype
Mariah Lawson on 12 19, 2011
Can Achieve Access Rate of One Gbps per Twisted Pair
Shenzhen, China, Huawei, a leading global information and communications technology (ICT) provider, today announced that it successfully launched the industry’s first Giga DSL (Digital Subscriber line) prototype. The Giga DSL system employs time division duplex (TDD) to achieve a total upstream and downstream rate of 1,000 Mb/s over a single twisted pair.
In order to address obstacles related to limited bandwidth of FTTB (Fiber to the Building)/FTTC(Fiber to the Curb) and difficulty in deploying FTTH (Fiber to the Home) drop cables – so that users can enjoy bandwidth-hungry services such as IPTV and HDTV – optical fiber access points need to be located closer to users. While, 100 Mbp/s-plus ultra-broadband access can be made available relatively quickly by utilizing legacy copper line resources, providing 1,000 Mbp/s bandwidth within 100 meters of twisted pairs using DSL technology is more complex.
By using low-power spectral density in-signal transmission, Huawei’s Giga DSL prototype reduces radiation interference and power consumption, and provides a total upstream and downstream rate of one Gb/s within 100 meters, and 500 Mb/s-plus within 200 meters – making it a cost-effective option for telecom operators building ultra-broadband access networks.
Giga DSL is a next-generation access technology solution that's growing quickly. In 2011, ITU-T set up a G.fast project team dedicated to formulating new standards for ultra-speed access at short distances, the aim being to achieve 500 Mb/s access rate per twisted pair within 100 meters. Huawei has actively participated in the work of the team and has become a major technical contributor, having recently worked to incorporate TDD-OFDM (Orthogonal Frequency Division Multiplexing) as a G.fast modulation mode.
Dr. Long Guozhu, Huawei’s Principal Expert of DSL technology, said, “Huawei has taken the lead in developing a Giga DSL prototype because of our rich capabilities and industry-leading technical strengths in access networks. It was inevitable that spectrum expansion would help us improve the rate of a twisted pair at a short distance, but after the spectrum is expanded, a technical issue appears: how to design the high-speed physical layer and high-frequency analog front end (AFE). To tackle this issue, Huawei’s FBB Innovation Lab used the core solution TDD-OFDM, which simplifies the physical-layer architecture and the AFE design, while at the same time makes it possible to be downward compatible with traditional ADSL/VDSL2 technologies.”
Huawei also recently announced the successful development of the world’s first node level vectoring (NLV) prototype. Huawei’s vectoring product provides 100 Mbps access over a single twisted pair in FTTC/FTTB, and has been tested and commercially trialed with many leading telecom operators. This, along with the company’s latest prototype, Giga DSL, signifies that DSL technology still has great potential to meet the requirements of broadband users for ultra-high-speed access in the future.
Huawei’s advances within Giga DSL will enhance the capabilities of the company’s SingleFAN broadband access solution. Its SingleFAN solution and related offerings are now servicing over one third of the world’s broadband users with ultra-broadband access services."
[Note: Picture source link: . Caption source link: .]
Huawei Smart AX M5300. The Smart AX MA5300 platform has been instrumental to Huawei's success in the global DSLAM (digital subscriber line access multiplexer) market, but the MA5600 series, designed to support more bandwidth-intensive services such as triple/quad play, is the company's flagship DSLAM.
"Huawei Unveils Industry’s First Giga DSL Prototype
Mariah Lawson on 12 19, 2011
Can Achieve Access Rate of One Gbps per Twisted Pair
Shenzhen, China, Huawei, a leading global information and communications technology (ICT) provider, today announced that it successfully launched the industry’s first Giga DSL (Digital Subscriber line) prototype. The Giga DSL system employs time division duplex (TDD) to achieve a total upstream and downstream rate of 1,000 Mb/s over a single twisted pair.
In order to address obstacles related to limited bandwidth of FTTB (Fiber to the Building)/FTTC(Fiber to the Curb) and difficulty in deploying FTTH (Fiber to the Home) drop cables – so that users can enjoy bandwidth-hungry services such as IPTV and HDTV – optical fiber access points need to be located closer to users. While, 100 Mbp/s-plus ultra-broadband access can be made available relatively quickly by utilizing legacy copper line resources, providing 1,000 Mbp/s bandwidth within 100 meters of twisted pairs using DSL technology is more complex.
By using low-power spectral density in-signal transmission, Huawei’s Giga DSL prototype reduces radiation interference and power consumption, and provides a total upstream and downstream rate of one Gb/s within 100 meters, and 500 Mb/s-plus within 200 meters – making it a cost-effective option for telecom operators building ultra-broadband access networks.
Giga DSL is a next-generation access technology solution that's growing quickly. In 2011, ITU-T set up a G.fast project team dedicated to formulating new standards for ultra-speed access at short distances, the aim being to achieve 500 Mb/s access rate per twisted pair within 100 meters. Huawei has actively participated in the work of the team and has become a major technical contributor, having recently worked to incorporate TDD-OFDM (Orthogonal Frequency Division Multiplexing) as a G.fast modulation mode.
Dr. Long Guozhu, Huawei’s Principal Expert of DSL technology, said, “Huawei has taken the lead in developing a Giga DSL prototype because of our rich capabilities and industry-leading technical strengths in access networks. It was inevitable that spectrum expansion would help us improve the rate of a twisted pair at a short distance, but after the spectrum is expanded, a technical issue appears: how to design the high-speed physical layer and high-frequency analog front end (AFE). To tackle this issue, Huawei’s FBB Innovation Lab used the core solution TDD-OFDM, which simplifies the physical-layer architecture and the AFE design, while at the same time makes it possible to be downward compatible with traditional ADSL/VDSL2 technologies.”
Huawei also recently announced the successful development of the world’s first node level vectoring (NLV) prototype. Huawei’s vectoring product provides 100 Mbps access over a single twisted pair in FTTC/FTTB, and has been tested and commercially trialed with many leading telecom operators. This, along with the company’s latest prototype, Giga DSL, signifies that DSL technology still has great potential to meet the requirements of broadband users for ultra-high-speed access in the future.
Huawei’s advances within Giga DSL will enhance the capabilities of the company’s SingleFAN broadband access solution. Its SingleFAN solution and related offerings are now servicing over one third of the world’s broadband users with ultra-broadband access services."
[Note: Picture source link: . Caption source link: .]
Equation
Lieutenant General
Good question. The answer is simple, because of China's large land mass and the difficulty in finding the invading enemy (think the Normandy Invasion of WWII) when satellites are knocked down and is hard to fight the enemy up front when your forces are spread out thinly (If that ever happens to China). Once a recon forces are able to locate any large assembly of the opposition force, the next move is to mass maneuver of large supplies and soldiers to the front as fast as possible without being detected. Imagine if the Germans would have this capability just in France and Italy alone, they could turn any Allied invasion forces into something worse then Dunkirk. Remember it's all about fuel and energy to mobilize an army and fire power to produce mass destruction to the enemy with as much efficiency as possible.
vesicles
Colonel
The Germans COULD have done that if they hadn't opened the second front to their east. Most of their resources were spread thin because of fighting both fronts, especially the Eastern front. Given the amount of man power, equipment and other stuff, Germany could easily defend the Normandy beaches against any large scale invasion IF they did not start the fight with the Soviets.
What is also different between Normandy and possibly China is that Normandy beaches are a short distance away from many large landmasses. It would be difficult for the defenders to predict where the enemy will be coming from and it would be easier for attackers to conceal itself. Most of the China's beaches, on the other hand, face open ocean. It would be very difficult for any potential attackers to hide themselves and hide their intentions. There is only a handful of potential locations where the potential attackers can use as launchpads. So any potential enemies will be spotted long before they have any chance of attacking. So a Normandy scenario probably won't be seen in China.
Equation
Lieutenant General
True, but the opposition force could also take another route, like on land with a temporary allied nation and go from there. Another one would be to airborne drop large troops and equipment on the high ground and away from the nearby highways and roads but close to water source like rivers and lakes as deter the enemy counter attack more difficult to maneuver. Once the distraction is in place, open up another front any where on China (whether on land or sea coast) to force the PLA to divide it's forces and fight a multi front war. Now I'm not suggesting that this will work, but it shows an example of the importance of logistics. It's not like a game board (Stratego and Axis & Allies) where you can conveniently see where the enemy is and you simply move your forces there to counter it. In real life war, the generals don't exactly how many, how much, and where the enemy is at. That's why reconnoiter is so important as to get data on the enemies location, activities, and numbers.
A fast train in a tunnel experiences a huge drag unless the train cross-section is small compared with the cross-section of the tunnel or, more practical, if the tunnel is evacuated. It has been proposed, many years ago already, that Switzerland would build a country-wide metro system with magnetically suspended trains running in evacuated tunnels at 1000 km/h. Think about it, in a few minutes from Bern to Geneva! But a country-wide network for China would be extremely expensive. And, if you build it, to limit its use to the military would be absurd.
Equation
Lieutenant General
True, but you don't need a full network of underground tunnels all across China, just the major coastal areas, and the Tibetan plateau and Inner Mongolia. China supposedly already has thousands of miles of underground secret tunnels, just add this to the already existing one.