{"id":2590,"date":"2017-12-20T13:59:23","date_gmt":"2017-12-20T16:59:23","guid":{"rendered":"https:\/\/www.nachodelatorre.com.ar\/mosconi\/?p=2590"},"modified":"2017-12-20T13:59:23","modified_gmt":"2017-12-20T16:59:23","slug":"redes-de-datos-ante-casos-de-emergencias-y-catastrofes","status":"publish","type":"post","link":"https:\/\/www.fie.undef.edu.ar\/ceptm\/?p=2590","title":{"rendered":"Redes de datos ante casos de emergencias y cat\u00e1strofes"},"content":{"rendered":"
<\/span><\/b>Cuando fallen las redes de comunicaciones territoriales o entren en colapso total, los enlaces de comunicaciones empleados por los ej\u00e9rcitos se pueden usar ante una emergencia o cat\u00e1strofe,\u00a0<\/span>DARPA comenz\u00f3 con el desarrollo de un enlace de comunicaciones inal\u00e1mbricas dentro de un rango de\u00a0<\/u>200 kil\u00f3metros<\/u>\u00a0(124 milas). Oficialmente denominado “Backbone de RF de 100 Gb\/s” ( SIC: 100G), el programa proporcionar\u00e1 al ej\u00e9rcito de EE. UU. Redes que son aproximadamente 500 veces m\u00e1s r\u00e1pidas que sus enlaces inal\u00e1mbricos actuales.<\/span><\/div>\n
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\"SomeDARPA has begun development of a wireless communications link that is capable of 100 gigabits per second over a range of 200 kilometers (124mi). Officially dubbed \u201c100 Gb\/s RF Backbone\u201d (or 100G for short), the program will provide the US military with networks that are around 500 times faster than its current wireless links.<\/p>\n

In essence, DARPA wants to give deployed soldiers the same kind of connectivity as a high-bandwidth, low-latency fiber-optic network. In the case of Afghanistan, for example, the US might have a high-speed fiber link to Turkey \u2014 but the remaining 1,000 miles to Afghanistan most likely consists of low-bandwidth, high-latency links. It\u2019s difficult (and potentially insecure) to control UAVs or send\/receive intelligence over these networks, and so the US military instead builds its own wireless network using Common Data Link.<\/p>\n

\"An<\/a>Common Data Link (CDL) is a secure wireless protocol that networks together a US military deployment, for shuttling around imagery, intelligence, orders, and so on. UAVs, aircraft carriers, helicopters, forward operating bases \u2014 they\u2019re all connected together via wireless CDL links, bounced via high-altitude aircraft or orbiting satellites. Exact, up-to-date specs are hard to come by, but it seems like the US military\u2019s existing CDL links max out at around 250Mbps. DARPA now wants to push these speeds up to 100Gbps, while using equipment that retains the same weight\/power requirements of CDL \u2014 i.e. these 100G systems must be deployable in the field.<\/p>\n

Suffice it to say, transmitting 100Gbps through the air is rather difficult; your home WiFi network probably maxes out at around 100Mbps, some thousand times slower. We\u2019ve written about visible light links that\u00a0operate at speeds up to 2.5Tbps<\/a>\u00a0\u2014 but only over a distance of one meter. Free-space optical communication isn\u2019t viable though, because clouds tend to get in the way when you\u2019re talking about 200-kilometer-long links. The only real option is RF, but again, transmitting 100Gbps over a 200-kilometer RF link is very tough.<\/p>\n

\"ViaSat-1,<\/a>The only RF link that is really comparable is\u00a0ViaSat-1<\/a>, a geosynchronous Ka-band communications satellite that sits above the USA, which has a total capacity of 134Gbps \u2014 but that\u2019s the combined total of 56 Ka transponders, so the actual bandwidth per link is much lower. In all likelihood, DARPA\u2019s 100G program will probably use the lower-frequency Ku band, which is less susceptible to rain fade (or degradation caused by other inclement atmospheric conditions). Assuming the right encoding\/multiplexing techniques can be discovered, there should be plenty of bandwidth in either the Ka or Ku bands to hit 100Gbps.<\/p>\n

DARPA clearly states that\u00a0the 100G program<\/a>\u00a0is for US military use \u2014 but it\u2019s hard to ignore the repercussions it might have on commercial networks, too. I\u2019m surprised that it has fallen to DARPA to develop an ultra-high-speed point-to-point wireless technology. 100Gbps wireless backhaul links between cell towers, rather than costly and cumbersome fiber links, would make it much easier and cheaper to roll out additional mobile coverage. Likewise, 100Gbps wireless links might be the ideal way to provide backhaul links to rural communities that are still stuck with dial-up internet access, or additional backbone bandwidth during peak periods. One day, you might even have a 100Gbps wireless link from your home to your ISP.<\/p>\n<\/div>\n

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Fuente:<\/strong>\u00a0http:\/\/www.extremetech.com<\/a><\/em><\/div>\n

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Cuando fallen las redes de comunicaciones territoriales o entren en colapso total, los enlaces de comunicaciones empleados por los ej\u00e9rcitos se pueden usar ante una… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[36,29],"tags":[],"_links":{"self":[{"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/posts\/2590"}],"collection":[{"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2590"}],"version-history":[{"count":0,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/posts\/2590\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}