{"id":7727,"date":"2012-10-18T21:03:55","date_gmt":"2012-10-19T02:03:55","guid":{"rendered":"http:\/\/bucktownbell.com\/?p=7727"},"modified":"2012-10-20T19:48:14","modified_gmt":"2012-10-21T00:48:14","slug":"docsis-3-1-targets-10-gig-downstream","status":"publish","type":"post","link":"http:\/\/bucktownbell.com\/?p=7727","title":{"rendered":"Docsis 3.1 Targets 10-Gig Downstream"},"content":{"rendered":"

ORLANDO — SCTE Cable-Tec Expo<\/a> — The Docsis 3.1 platform will support capacities of at least 10Gbit\/s downstream and 1Gbit\/s upstream<\/strong>, a move that will certainly prolong the industry’s need to deploy fiber all the way to the home. <\/span><\/p><\/blockquote>\n

via Light Reading Cable – Cable – Docsis 3.1 Targets 10-Gig Downstream – Telecom News Analysis<\/a>.<\/p>\n

To hit its capacity targets, the cable industry wants to increase its spectral efficiency by about 50 percent<\/strong>. As expected, the new specs will do away with 6MHz- and 8MHz-wide channel spacing and instead use smaller (20KHz-to-50KHz-wide) orthogonal frequency division multiplexing (OFDM)<\/a> subcarriers; these can be bonded inside a block spectrum that could end up being about 200MHz wide. (See Docsis 3.1 Will Change Cable’s Data Channels<\/a>.) <\/span><\/p><\/blockquote>\n

The definition of ofdm from wiki.<\/a><\/p>\n

Orthogonal frequency-division multiplexing<\/strong> (OFDM<\/strong>) is a method of encoding digital data on multiple carrier frequencies. OFDM has developed into a popular scheme for wideband<\/a>digital communication<\/a>, whether wireless<\/a> or over copper<\/a> wires, used in applications such as digital television and audio broadcasting, DSL<\/a>broadband internet access<\/a>, wireless networks, and 4G<\/a> mobile communications.<\/p><\/blockquote>\n

And the primary advantage using ofdm is:<\/p>\n

The primary advantage of OFDM over single-carrier schemes is its ability to cope with severe channel<\/a> conditions<\/strong> (for example, attenuation<\/a> of high frequencies in a long copper wire, narrowband interference<\/a> and frequency-selective fading<\/a> due to multipath<\/a>) without complex equalization filters.\u00a0 <\/strong>Channel equalization<\/a> is simplified because OFDM may be viewed as using many slowly modulated narrowband<\/a> signals rather than one rapidly modulated wideband<\/a> signal.<\/strong><\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"

ORLANDO — SCTE Cable-Tec Expo — The Docsis 3.1 platform will support capacities of at least 10Gbit\/s downstream and 1Gbit\/s upstream, a move that will certainly prolong the industry’s need to deploy fiber all the way to the home. via … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[287],"tags":[864,929,881,930],"class_list":["post-7727","post","type-post","status-publish","format-standard","hentry","category-interfaces","tag-docsis","tag-ofdm","tag-physical-layer","tag-transmission"],"_links":{"self":[{"href":"http:\/\/bucktownbell.com\/index.php?rest_route=\/wp\/v2\/posts\/7727","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/bucktownbell.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/bucktownbell.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/bucktownbell.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/bucktownbell.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7727"}],"version-history":[{"count":4,"href":"http:\/\/bucktownbell.com\/index.php?rest_route=\/wp\/v2\/posts\/7727\/revisions"}],"predecessor-version":[{"id":7810,"href":"http:\/\/bucktownbell.com\/index.php?rest_route=\/wp\/v2\/posts\/7727\/revisions\/7810"}],"wp:attachment":[{"href":"http:\/\/bucktownbell.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7727"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/bucktownbell.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7727"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/bucktownbell.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7727"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}