Acceptable Crc Error Rate
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IP isWhoisCalculatorTool PointsNewsNews tip?ForumsAll ForumsHot TopicsGalleryInfoHardwareAll FAQsSite FAQDSL FAQCable TechAboutcontactabout uscommunityISP FAQAdd ISPISP Ind. ForumsJoin Search similar:is this something i need a tech to look at?FEC and CRC On only 1 lineOdd problemThunder storms and CRC errorsTalked CL into Provisioning 40/5, how many issues? Forums → US ISPs non-cable → CenturyLink → CRC errors: What's crc errors cisco the acceptable threshold? uniqs3982 Share « [Prism TV] 2nd Internet Connection • MLPPP? » crc errors ethernet rapteljoin:2014-07-12Flint Hill, VA raptel Member 2014-Jul-25 9:49 am CRC errors: What's the acceptable threshold?Hi all,I am pleased to say that after
Input Errors On Interface
living without wire-based broadband Internet access for over 5 years, I finally have a 10 mbps DSL connection at my home! Getting it set up would not have been possible without the great customer service https://supportforums.cisco.com/discussion/10806391/crc-error-and-input-error-how-can-fix-these provided by Joey and his team here on DSL Reports. (I will elaborate more on that in my future review).I've had the modem (ZyXEL Q1000Z) online for about 22 minutes, and I'm already starting to rack up on CRC errors. I've got 94 near-end and 24 far-end CRC errors in the span of 22 minutes. Does this seem high?Have a look at my line status here:»imgur.com/a/nSo3ZThe connection seems to be working http://www.dslreports.com/forum/r29414786-CRC-errors-What-s-the-acceptable-threshold reasonably well, but I also have voice service, and the line sounds like absolute trash (yes, I've got a filter installed and I've checked with a telephone at the NIB - still sounds awful). I haven't yet plugged my modem directly into the NIB, but since the telephone sounds horrible there, I don't imagine it is an inside-wiring issue. I have only two CAT5e home runs directly to the NIB, anyway, so it should be pretty solid.What do you all think?Thanks. This place is a great resource! · actions · 2014-Jul-25 9:49 am · TechMikejoin:2008-06-09Denver, CO TechMike Member 2014-Jul-25 10:04 am A hundred in 20 minutes is not bad as long as those counters stop incrementing.What you don't want to see is thousands or more in a relatively short period.For example, yesterday when I was having problems, my modem registered 147,960 near end CRC errors in 30 minutes. Now that's a problem.EDiT: I missed the part about the telephone sounding like trash. You definitely have a problem there, though based on what you posted doesn't seem to heavily affect the DSL modem. · actions · 2014-Jul-25 10:04 am · gapmnjoin:2013-11-10Saint Paul, MN gapmn Member 2014-Jul-25 12:30 pm Seems strange that you have CRC errors and no FEC errors. · actions &
guide Switch to Plusnet Recommend a friend Line Rental Saver BT Sport About Us About Us Why choose Plusnet? Find out how we'll do you proud Customer satisfaction Our customers are more satisfied than those https://community.plus.net/t5/Broadband/Normal-CRC-error-rate/td-p/969848 of Sky, TalkTalk and Virgin Our awards Multi-award winning broadband provider with UK based https://www.mail-archive.com/cisco@groupstudy.com/msg93750.html customer service Help & Support Member Centre Community Contact us Business Broadband Sign In Forum Blog Browse all postsposts in this categoryposts in this boardusers turn on suggestions Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for error rate Search instead for Do you mean Advanced search... Normal CRC error rate? Subscribe to RSS Feed Mark Topic as New Mark Topic as Read Float this Topic to the Top Bookmark Subscribe Printer Friendly Page Plusnet Community : Forum : Help with my Plusnet services : Broadband : Normal CRC error rate? mgillespie Grafter Posts: 222 Registered: 08-04-2007 Normal CRC error rate? 03-03-2013 11:44 PM Options Mark as New Bookmark Subscribe Subscribe acceptable error rate to RSS Feed Highlight Print Report to Moderator Wondering what the regular RX CRC error rate should be.My connection seems to stall some times.Looking at my router stats:ADSL2+(G.992.5)Up Speed:444937Down Speed:14336000SNR Margin:7Loop Attenuation:32I am getting 0.4% CRC on the RX.RX packets (over 3 days) 12761850RX CRC errors (over same period) 59750 Message 1 of 10 (5,462 Views) Reply 0 Thanks All Forum Topics Previous Topic Next Topic 9 REPLIES wykehamhouse Grafter Posts: 260 Registered: 01-02-2013 Re: Normal CRC error rate? 04-03-2013 7:23 AM Options Mark as New Bookmark Subscribe Subscribe to RSS Feed Highlight Print Report to Moderator You are getting approximately 19917 CRC errors a day and approximately 830 CRC errors an hour. That is rather high. However, is interleaving disabled? If so, then you can expect high errors like these due to having no error correction and all correctable errors (if interleaving were to be enabled) becoming uncorrectable errors. In addition, to the errors all come in one burst or do they accumulate slowly? Message 2 of 10 (411 Views) Reply 0 Thanks mgillespie Grafter Posts: 222 Registered: 08-04-2007 Re: Normal CRC error rate? 12-03-2013 3:32 PM Options Mark as New Bookmark Subscribe Subscribe to RSS Feed Highlight Print Report to Moderator How can I tell if interleaving is enabled or disabled?I did ha
assume that you are referring to CRC errors on full-duplex Ethernet or serial links. CRC errors are caused by noise, signal reflections, impedance mismatches, improperly installed demarcs, faulty hardware, and other bad things that really shouldn't happen. The number should be really low. That's helpful, eh? :-) CRC errors should be less on fiber-optic cabling compared to copper cabling. According to industry standards, fiber-optic cabling should not experience more than one bit error per 10^11 bits. Copper cabling should not experience more than one bit error per 10^6 bits. Some documents from Cisco and other vendors specify a threshold of one bad frame per megabyte of data. In other words, an interface should not experience more than one CRC error per megabyte of data received. (The "megabyte of data" threshold comes from the industry standards that state that copper cables should not have a bit error rate that exceeds 1 in 10^6.) This method is better than simply calculating a percentage of bad frames compared to good frames, which does not account for the variable size of frames. (If you have a constant flow of 64-byte frames, for example, and a percentage of them is getting damaged, that probably represents a more serious problem than the same percentage of 1500-byte frames getting damaged. So, it's better to use a total number of bytes rather than a total number of frames in the calculation.) When troubleshooting at the Data Link Layer, which deals with frames rather than bits, you can't actually determine a bit error rate, but you can at least get a rough estimate by considering the number of CRC errors compared to the number of megabytes received. Some Cisco documentation simply states that a problem exists if input errors are in excess of 1 percent of total interface traffic. This is easier to remember, but it's actually just as hard to comprehend. The documents don't specify whether you should compare the input errors to the number of frames or the number of bytes received. If they means frames, then we have the problem already mentioned (no accounting for variable frame size