{"id":855,"date":"2016-01-21T11:46:45","date_gmt":"2016-01-21T09:46:45","guid":{"rendered":"https:\/\/excentiscom.webhosting.be\/?p=855"},"modified":"2022-06-24T08:20:19","modified_gmt":"2022-06-24T06:20:19","slug":"take-care-of-your-cable-network-health","status":"publish","type":"post","link":"https:\/\/www.excentis.com\/blog\/take-care-of-your-cable-network-health\/","title":{"rendered":"Take care of your cable network health"},"content":{"rendered":"<p>Nothing is perfect. We all know this, and we have to live with it. However, trying to improve is a key to success. This is true for cable networks as well. A bad plant condition and interferers may degrade the communication between CM and CMTS. Luckily though there is lot of data that can be monitored to detect quite some issues.<\/p>\n<p>This blog post aims to provide a better understanding of the available information and how this can be used in a monitoring system. As you might know, information on a CMTS can be fetched via three interfaces; SNMP, CLI and IPDR. For now we will only focus on SNMP (using\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Management_information_base\">MIBs<\/a>).<\/p>\n<p>The MIBs that will be discussed can be divided into two domains. MIBs with more or less clear limits, and MIBs that must be interpreted according to their context.<\/p>\n<h2>MIBs with known limits<\/h2>\n<p>Following table shows a view on the most typical EuroDOCSIS 3.0 requirements (for US-DOCSIS and pre-3.0 other limits and MIBs apply). In a healthy network following conditions will be met:<\/p>\n<ul>\n<li>values are not too close to the limits<\/li>\n<li>values are stable over time<\/li>\n<li>small difference between values over different channels<\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td><\/td>\n<td><strong>Power<\/strong><\/td>\n<td><strong>SNR<\/strong><\/td>\n<td><strong>Microreflections<\/strong><\/td>\n<\/tr>\n<tr>\n<td>CM Tx<\/td>\n<td>Max 55dBmV (QPSK)(*)<br \/>\nMax 52dBmV (QAM16)(*)<br \/>\nMax 51dBmV (QAM64)(*)<br \/>\n(*) 4 upstreams<\/td>\n<td>transmit equalization ON:<br \/>\n=35dB for all modulations &gt; QPSK<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>CM Rx<\/td>\n<td>-17\/+13dBmV (QAM64)<br \/>\n-13\/+17dBmV (QAM256)<\/td>\n<td>=25.5dB (QAM64)<br \/>\n=34.5dB (QAM256, -13 to -6dBmV)<br \/>\n=31.5dB (QAM256, -6 to 17dBmV)<\/td>\n<td>-10dBc@&lt;=0.5\u00b5s<br \/>\n-15dBc@&lt;=1\u00b5s<br \/>\n-20dBc@&lt;=1.5\u00b5s<br \/>\n-31,5dBc@&gt;1.5\u00b5s<\/td>\n<\/tr>\n<tr>\n<td>CMTS Rx<\/td>\n<td>Configured Rx point<br \/>\n+\/- CMTS threshold<br \/>\ne.g. 0dBmV +\/- 6dB<\/td>\n<td>target values:<br \/>\n=13dB(qpsk)<br \/>\n=19dB(qam16)<br \/>\n=25dB(qam64)<\/td>\n<td>-10dBc@&lt;=0.5\u00b5s<br \/>\n-20dBc@&lt;=1\u00b5s<br \/>\n-31,5dBc@&gt;1\u00b5s<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Record the Power<\/h3>\n<p>It&#8217;s important to keep all powers at the cable modem (CM) as well as CMTS side within their limits, preferably with a certain margin. The CM\u00a0<em>docsIf3CmStatusUsTxPower<\/em>\u00a0MIB represents the operational transmit power per upstream channel. At the CMTS, the\u00a0<em>docsIf3CmtsCmUsStatusRxPower<\/em>\u00a0MIB can be used to obtain the receive power per CM and per upstream channel. Both downstream transmit and receive power can be monitored with the\u00a0<em>docsIfDownChannelPower\u00a0<\/em>MIB<em>,\u00a0<\/em>depending if you query the CM or CMTS.<\/p>\n<h3>Observe the SNR<\/h3>\n<p>SNR (signal-to-noise ratio) is also a very important parameter. It compares the level of a desired signal to the level of background noise and is expressed in decibels (dB). At the CM, the\u00a0<em>docsIfSigQSignalNoise MIB\u00a0<\/em>will give you an idea of the SNR of the downstream channel as received by the CM. At the CMTS, the\u00a0<em>docsIf3CmtsCmUsStatusSignalNoise\u00a0<\/em>can be used to read the SNR per upstream channel per CM. Alternatively, you can also use the\u00a0<em>docsIf3SignalQualityExtRxMER or docsIf3CmtsSignalQualityExtCNIR<\/em>\u00a0MIB. The first one provides an in-channel MER (modulation error ratio) measurement while the second one provides an in-channel carrier-to-noise plus interference ratio. It&#8217;s especially ingress noise that is reflected in SNR. To see the impact of impulse noise it is sensible to check the FEC values as well.<\/p>\n<h3>Calculate CER\/CCR<\/h3>\n<p>Forward Error Correction (FEC) is a technique used to detect and correct transmission failures that happen at the physical transmission layer. This is a powerful feature increasing the reliability on noisy channels and preventing that packets are dropped. The best way to use these values is calculating the CER (Codeword Error Rate) and CCR (Corrected Codeword Rate) over time.<\/p>\n<p>For example, downstream CER and CCR:<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-856 size-full\" src=\"https:\/\/www.excentis.com\/wp-content\/uploads\/cer_ccr.png\" alt=\"\" width=\"756\" height=\"145\" srcset=\"https:\/\/www.excentis.com\/wp-content\/uploads\/cer_ccr.png 756w, https:\/\/www.excentis.com\/wp-content\/uploads\/cer_ccr-300x58.png 300w\" sizes=\"(max-width: 756px) 100vw, 756px\" \/><\/p>\n<p>CER\/CCR can be calculated both in upstream and downstream direction. The MIBs from the\u00a0<em>docsIfSignalQualityTable<\/em>\u00a0can be used for the downstream CER\/CCR on the CM (as in the formulas above), the MIBs from the\u00a0<em>docsIf3CmtsCmUsStatusTable<\/em>\u00a0can be used for the upstream CER\/CCR on the CMTS per modem per upstream channel.<\/p>\n<p>High values for CER will indicate packetloss which means service degradation. An increment of CCR is alarming.<\/p>\n<p>Values for upstream CER can for example be divided into four categories:<\/p>\n<ul>\n<li>0.5%: real time service degradation<\/li>\n<li>1%: normal data service degradation<\/li>\n<li>=1.10<sup>-3<\/sup>: acceptable<\/li>\n<li>=5.10<sup>-4<\/sup>: ideal<\/li>\n<\/ul>\n<p>For the downstream the CM must achieve a CER of less than or equal to 9.10<sup>-7<\/sup>.<\/p>\n<h3>Scan for Microreflections<\/h3>\n<p>Microreflection (<em>docsIfSigQMicroreflections<\/em>) and equalization data (<em>docsIfSigQEqualizationData<\/em>) is also helpful data provided by the CM. These reflections are caused by impedance mis-match and might result in packet loss. The data can be used to estimate the presence, location and severity of reflections. On the CMTS similar MIBs are available:\u00a0<em>docsIf3CmtsCmUsStatusMicroreflections<\/em>\u00a0and\u00a0<em>docsIf3CmtsCmUsStatusEqData<\/em>.<\/p>\n<h2>MIBs requiring interpretation<\/h2>\n<p>Some MIBs are used to detect or investigate issues but do not have clear requirements. However, when properly interpreted they can deliver additional value to your monitoring system. Often these will show a correlation with the MIBs with known limits just discussed.<\/p>\n<h3>Detect Partial Service<\/h3>\n<p>When a bonded CM has lost one ore more channels we call this Partial Service. It&#8217;s obvious that this can result in performance issues. This is however difficult to monitor as there is no &#8220;Partial Service MIB&#8221; that can be used to determine if a CM is operating in Partial Service. There are however other possibilities to detect whether channels are disconnected. For example the\u00a0<em>docsIf3CmStatusUsRangingStatus<\/em>\u00a0MIB can be used to denote the ranging state of the CM per upstream. When a 3.0 CM has no usable upstream channels anymore it will re-initialize. As a result of this reset the\u00a0<em>docsIfCmStatusResets<\/em>\u00a0MIB will be incremented. The\u00a0<em>docsIfDownstreamChannelTable<\/em>\u00a0MIB can be used to check if there are disconnected downstream channels.<\/p>\n<h3>Listen to timeouts<\/h3>\n<p>Monitoring the ranging timers of a CM might also be very useful for troubleshooting as it indicates whether there were any CM-CMTS communication failures. Two important MIBs that can be used are the\u00a0<em>docsIf3CmStatusUsT3Timeouts<\/em>\u00a0MIB (wait for ranging response) and the\u00a0<em>docsIf3CmStatusUsT4Timeouts<\/em>\u00a0MIB (wait for unicast ranging opportunity).<\/p>\n<p>More information about these timers can be found in a previous blog post (<a href=\"https:\/\/www.excentis.com\/blog\/ranging-feeling-2-bpm-docsis-heartbeat\">Ranging \u2013 Feeling the 2 bpm DOCSIS heartbeat<\/a>) where the essentials of ranging and its pitfalls are described.<\/p>\n<h3>Perform spectrum measurements<\/h3>\n<p>For RF related problems like signal interference you might want to perform spectrum measurements. For the CM this can be done by configuring and reading the MIBs in\u00a0<em>docsIf3CmSpectrumAnalysisCtrlCmd<\/em>\u00a0and\u00a0<em>docsIf3CmSpectrumAnalysisMeasTable<\/em>\u00a0<em>.\u00a0<\/em>For the CMTS you need the\u00a0<em>docsIf3CmtsSpectrumAnalysisMeasTable<\/em>.<\/p>\n<h3>Discover the event text and diagnostic log<\/h3>\n<p>The Event Text is very convenient because this contains human-readable information of events and problems of CM and CMTS. These logs can be found in the\u00a0<em>docsDevEvTable\u00a0<\/em>MIBs.<\/p>\n<p>On the CMTS the Diagnostic Log can provide extra information. This is a tool where you can predefine conditions to detect ranging and registration problems with CMs. For example: A CM is added to the log as soon as two RNG-REQ (ranging request) attempts are missed out of ten. To achieve this you need to configure the\u00a0<em>docsDiagLogTable<\/em>.<\/p>\n<h2>Conclusion<\/h2>\n<p>As you can see there&#8217;s a lot of information that can be collected. It&#8217;s a true challenge to store all the data, correlate the values and monitor changes over time. Afterwards the next step might be alarming and trending. Once that&#8217;s achieved you&#8217;ve built a nice monitoring system.<\/p>\n<p>The recommendations in this article are very useful for (Euro)DOCSIS 3.0, but in 3.1 a whole new toolset will be available: PNM (Proactive Network Maintenance). PNM gathers lots of data from close to the PHY layer in order to determine and locate negative factors as soon and quickly as possible. Quite interesting toolbox that allows a network operator to detect issues before the customer notices them. We plan to take a closer look in a future blog post.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nothing is perfect. We all know this, and we have to live with it. However, trying to improve is a key to success. This is true for cable networks as well. A bad plant condition and interferers may degrade the communication between CM and CMTS. Luckily though there is lot of data that can be &hellip;<\/p>\n","protected":false},"author":4,"featured_media":856,"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":[46,48,39,60],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Take care of your cable network health - 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\/take-care-of-your-cable-network-health\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Take care of your cable network health - Excentis\" \/>\n<meta property=\"og:description\" content=\"Nothing is perfect. 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