{"id":759,"date":"2014-10-27T09:07:52","date_gmt":"2014-10-27T07:07:52","guid":{"rendered":"https:\/\/excentiscom.webhosting.be\/?p=759"},"modified":"2022-06-24T08:34:40","modified_gmt":"2022-06-24T06:34:40","slug":"can-you-really-reduce-cable-modem-power-usage-by-using-the-energy-management-feature","status":"publish","type":"post","link":"https:\/\/www.excentis.com\/blog\/can-you-really-reduce-cable-modem-power-usage-by-using-the-energy-management-feature\/","title":{"rendered":"Can you really reduce Cable Modem power usage by using the Energy Management feature?"},"content":{"rendered":"<p>With\u00a0<a title=\"UN Climate Change summit\" href=\"http:\/\/www.un.org\/climatechange\/summit\/\" target=\"_blank\" rel=\"noopener\">climate changes<\/a>\u00a0and possible\u00a0<a title=\"Possible Blackouts in Belgium\" href=\"http:\/\/deredactie.be\/cm\/vrtnieuws.english\/News\/1.2060840\" target=\"_blank\" rel=\"noopener\">blackouts<\/a>\u00a0in Belgium, saving energy is becoming ever more important. So how can the Cable world contribute? The future standard,\u00a0<a title=\"DOCSIS 3.1\" href=\"http:\/\/www.cablelabs.com\/innovations\/featured-technology\/\" target=\"_blank\" rel=\"noopener\">DOCSIS 3.1<\/a>, promises advanced energy saving features using\u00a0<a title=\"DOCSIS Light Sleep\" href=\"http:\/\/www.cablelabs.com\/wp-content\/uploads\/2014\/04\/60340-published.pdf\" target=\"_blank\" rel=\"noopener\">DOCSIS Light Sleep<\/a>\u00a0(DLS) mode. No need to wait though, the current specification (DOCSIS 3.0) already provides a mechanism to reduce cable modem power usage: Energy Management 1\u00d71.\u00a0 Let\u2019s take a closer look.<\/p>\n<h2>What is it?<\/h2>\n<p>In DOCSIS 3.0, cable modems use multiple channels to send and receive traffic at higher speeds (bonding). This means that multiple transmitters and receivers are active all the time at the cable modem.<\/p>\n<p>Most of the time, one transmit and receive channel is sufficient to cope with the traffic at that moment. The other transmitters and receivers could be switched off (saving energy) without the customer noticing. When more traffic needs to be sent or received, we could switch on the other transmitters and\/or receivers.<\/p>\n<p>This is exactly what the Energy Management 1\u00d71 feature does.<\/p>\n<h2>How can I activate it?<\/h2>\n<p>So how does it work? It\u2019s actually pretty easy:<\/p>\n<ul>\n<li>Your headend (CMTS) and modem (CM) need to support the feature (it was added in 2012 to the\u00a0<a title=\"DOCSIS 3.0 MULPI spec\" href=\"https:\/\/apps.cablelabs.com\/specification\/CM-SP-MULPIv3.0\" target=\"_blank\" rel=\"noopener\">specification<\/a>\u00a0with additional\u00a0<a title=\"Energy Management Guidelines document\" href=\"https:\/\/apps.cablelabs.com\/specification\/operational-guidelines-for-energy-management-1x1-feature\" target=\"_blank\" rel=\"noopener\">guidelines<\/a>) .<\/li>\n<li>Activate it on the CMTS through CLI or by setting a MIB value: docsIf3MdCfgEnergyMgt1x1Enabled .<\/li>\n<li>Activate it on the CM by adding a piece of information to the modem\u2019s config file (Energy Management TLV).<\/li>\n<\/ul>\n<h2>How can I configure it?<\/h2>\n<p>The actual configuration of the Energy Management feature is done in the Cable Modem config file.<\/p>\n<p>Here\u2019s an example of such an Energy Management TLV (TLV 74):<\/p>\n<pre>Energy Management Parameter Encoding\r\n  Energy Management Feature Control:enabled\r\n  1x1 Mode Encodings\r\n    Downstream Activity Detection Parameters\r\n      Downstream Entry Bitrate Threshold:1500000\r\n      Downstream Entry Time Threshold:300\r\n      Downstream Exit Bitrate Threshold:2000000\r\n      Downstream Exit Time Threshold:2\r\n    Upstream Activity Detection Parameters\r\n      Upstream Entry Bitrate Threshold:500000\r\n      Upstream Entry Time Threshold:300\r\n      Upstream Exit Bitrate Threshold:1000000\r\n      Upstream Exit Time Threshold:2\r\n  Energy Management Cycle Period:900<\/pre>\n<p>For this example:<\/p>\n<ul>\n<li>The modem enters 1\u00d71 mode when downstream rate was below 1,5 Mbps AND the upstream rate was below 0,5 Mbps for at least 300 seconds and the last time the modem entered 1\u00d71 mode is at least 900 seconds ago (Cycle Period).<\/li>\n<li>The modem exits 1\u00d71 mode if the downstream rate was above 2 Mbps OR the upstream rate was above 1 Mbps for at least 2 seconds.<\/li>\n<\/ul>\n<p>You can use our freely available\u00a0<a title=\"Cable Modem Config File Editor\" href=\"https:\/\/www.excentis.com\/products\/configfileeditor\" target=\"_blank\" rel=\"noopener\">DOCSIS config file editor<\/a>\u00a0to create the necessary config files.<\/p>\n<h2>Why would I not use it?<\/h2>\n<p>If it\u2019s easy to use and saves energy, why would you not use Energy Management?<\/p>\n<p>Here\u2019s a couple of reasons:<\/p>\n<ul>\n<li>If exiting 1\u00d71 mode goes wrong, the CM can get stuck in 1\u00d71 mode.<\/li>\n<li>Even with short exit times (minimum is 1 second), the influence on internet speeds will be noticeable in various speed tests.<\/li>\n<li>Monitoring applications might think the CM has gone into partial service mode, so they need to be made Energy Management aware.<\/li>\n<\/ul>\n<h2>How much energy can I save?<\/h2>\n<p>But most importantly, how much energy can we actually save?<\/p>\n<p>We\u2019ve put a number of units to the test. The actual power savings were less than 0.5 W. At best. For some units there was not even a noticeable difference. In idle mode (no traffic) or when sending a lot of traffic (exiting 1\u00d71 mode) there was no difference at all.<\/p>\n<p>The results on your modems might be different, so make sure to test it out yourself!<\/p>\n<h2>Bottom line<\/h2>\n<p>While easy to implement, the actual energy savings in 1\u00d71 mode on the units we tested were disappointing and hardly justify the risks.\u00a0 Hopefully DOCSIS 3.1 Light Sleep mode will prove to be a better alternative.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>With\u00a0climate changes\u00a0and possible\u00a0blackouts\u00a0in Belgium, saving energy is becoming ever more important. So how can the Cable world contribute? The future standard,\u00a0DOCSIS 3.1, promises advanced energy saving features using\u00a0DOCSIS Light Sleep\u00a0(DLS) mode. No need to wait though, the current specification (DOCSIS 3.0) already provides a mechanism to reduce cable modem power usage: Energy Management 1\u00d71.\u00a0 Let\u2019s &hellip;<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"_genesis_block_theme_hide_title":false,"footnotes":""},"categories":[49,39],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Can you really reduce Cable Modem power usage by using the Energy Management feature? - Excentis<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.excentis.com\/blog\/can-you-really-reduce-cable-modem-power-usage-by-using-the-energy-management-feature\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Can you really reduce Cable Modem power usage by using the Energy Management feature? - Excentis\" \/>\n<meta property=\"og:description\" content=\"With\u00a0climate changes\u00a0and possible\u00a0blackouts\u00a0in Belgium, saving energy is becoming ever more important. 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