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Home / Modem Will Not Connect to Internet and Then Power Cycles Again

Modem Will Not Connect to Internet and Then Power Cycles Again

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From fourth dimension to fourth dimension, modem signal levels tin become out of specs. This is usually a symptom of degrading or underperforming hardware or some other problem. This is the get-go step many technicians volition take when sent out to your home to diagnose an internet connection issue.

Steps

  1. 1

    Sympathize the basic terminology. Computing is notorious for having a lot of acronyms and jargon that tin can be difficult to wrap your head around. Even so, these concepts can exist easily learned by most people.

    • Upstream: This means away from you and towards the internet and your internet service provider. Your cable modem is connected to a coaxial cable that leaves your house. Recall of wherever that goes as upstream.
    • Downstream: The opposite of upstream. This means information coming downwards from the internet to your modem.
    • SNR: Indicate to Noise Ratio. Quite simply, this is a number that represents how much signal there is on the line versus noise. Point is what you want: encoded, understandable information from the internet. Noise is bad and tin can come up from electromagnetic interference (from other electronic devices and radio signals) and thermal noise. Knowing what those ii things are isn't too important right now. Only know that you want a meliorate signal and less racket.
    • Frequency: When you melody your radio or change your Tv aqueduct, you are telling the device to listen at a different frequency. Channels are also used to send information destined for the internet over the cable network in pretty much the same way that TVs do.
    • Headend/CMTS: Where your cable modem and the modem of other people in your town/city connect to. This is a slice of equipment operated by your ISP that manages all the cable modems and connects them to the cyberspace. From here, network engineers tin can bank check the health of your modem as well as reboot information technology remotely and push button configuration changes to it.
    • FEC: Frontwards error correction. Data doesn't e'er transmit through cables perfectly, there are ofttimes some errors in the $.25 (1s and 0s). For instance, a 0 might exist flipped to a ane or vice versa. In guild to correct those errors, some actress data has to be fastened to every codeword that goes out (a codeword is only a fixed chunk of information). If it can fix the error, and then everyone'southward happy. Withal, sometimes codewords accept likewise many incorrect bits and the error correction algorithm (called Reed-Solomon, if you're interested) tin't fix it. [1] If more than ane% of your codewords are uncorrectable, you volition starting time to meet some issues (especially with VoIP).[2]

  2. 2

    Find your modem's diagnostics page. Most modern modems exercise have such a feature to assist people with solving technical problems. For many modems, this is "192.168.100.1". For others, this may differ and so contact your Isp or research it in the owners manual that came with your specific modem. (e.one thousand. Many Linksys modems listen at 192.168.i.ane). You'll demand to enter that into your spider web browser's address bar. If you're not certain, wait upwardly your modem'south brand and model number followed by "diagnostics folio" to find what accost information technology should be located at. If your modem does not accept a spider web folio, you won't be able to follow this commodity — contact your ISP for help with diagnosing your connection if you lot're having issues.

    • If you take more than one Net connection, to get this local IP address, make sure that you are connected to that particular connection before typing in the address into your browser.
    • For only some issues, fifty-fifty if your modem is connected to your estimator, you can yet cheque your server settings despite the inability to check whatsoever other page. Even so, a more complicated setup may require a visit from a technician.

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  3. three

    Login to your modem. Login if your modem allows its users to connect to their ain server settings folio. These modems will accept the login settings written in the volume.

    • For some Linksys modems (particularly wireless modems), you can stick pretty much annihilation in the username box (even gibberish) and place your current network password into the password box.

  4. four

    Check the status of each of the modem'southward stages. These are all important and if one does non match up with what you lot expect you may need to dig deeper to figure out why.

    • Learn Downstream Channel: This should say "Locked", "OK" or similar. This means your modem found the frequency with which to receive information from the internet. There should always be at least 1 channel acquired with a DOCSIS ane.1 or ii.0 modem. If yous accept a DOCSIS iii.0 modem, you should be acquiring up to the maximum your modem supports (8 or 16).
    • Connectivity State: This should be OK or Operational.
    • Configuration File: This should show the name of your configuration file. If non, just come across if it says "OK" or similar. This file is downloaded from your Isp and tells the modem how information technology should behave.
    • Security: This should ever say "Enabled" or "BPI+" in all cases.

  5. five

    Evaluate the power levels. These are classified into two types, upstream and downstream. You'll have some downstream channels and besides some upstream channels. Each one has split power levels and SNR listed for information technology. [3]

    • Downstream power levels should be betwixt -ten dBmV and 10 dBmV. Ideally, information technology should exist as close to zero every bit possible. Many line technicians aim for the fifty-fifty more stringent +/-5 dBmV range. As long as it'due south within these ranges, they should be okay. Many modems are even rated to +/- 15 dBmV. Too low ways your signal is weak, and too high means the signal is strong - possibly too strong (and volition demand to exist corrected with an attenuator or splitter).
    • Upstream power levels should be between 40 - fifty dBmV. Call back of this measurement as how loud your modem has to scream to be heard past the CMTS. If you are transmitting less than 40 dBmV, your upstream SNR volition dethrone (If you're whispering and the CMTS is shouting at the same time, they'll have trouble hearing). If information technology'south higher than about fifty dBmV, your cable modem may intermittently become offline or have a high number of uncorrectable codeword errors.
    • One of the virtually common causes of upstream power issues is splitters. If possible, your cable modem for your internet should exist on the first splitter fastened to the line that comes in from your house. Further splitters will degrade the signal quality — TVs can handle it, but you will see more noticeable problems with the net.

  6. half-dozen

    Bank check the SNR values. Typically, you lot volition only see the downstream SNR value equally information technology can be more accurately measured. Your Internet access provider can see what your upstream SNR would be from their cease. With this value, the higher the better. You want this number over thirty, although y'all might not experience any problems 25 or in a higher place. There is no real maximum to this number, but information technology rarely goes college than 40 dB on most installations considering there is inevitably some noise in the line.

  7. vii

    Review the result log. A lot of the events in hither are usually unimportant, nevertheless if you have been experiencing internet issues then some of them may exist relevant. Look for whatsoever thing with a status lawmaking of "Critical" or similar, and ignore those that say "Detect". Here are some examples of errors you might encounter.

    • No Ranging Response received - T3 time-out: The cable modem's knocking at the door, trying to find your ISP. Alas no one's dwelling or it can't hear them if they are. This is usually indicative of an upstream noise problem, so check your upstream power level to run across if it's too high (peradventure > 55). If and then, telephone call your ISP for assistance.
    • SYNC Timing Synchronization failure - Failed to learn FEC framing: FEC ways forward error correction. Possible causes include besides much noise, low signal, or a bad cable modem.
    • Resetting the cablevision modem due to docsDevResetNow: Usually a reboot issued by your ISP, due to a firmware update, provisioning your modem, or other upstream maintenance. It's not ordinarily something to worry about. If it happens frequently, you should ask your ISP what'due south going on — there might be an outage in your area they're trying to fix.

  8. 8

    Unplug the modem. Wait a few minutes so plug it back in. Your modem should endeavour registration with your internet access provider again. You should see status indicators on the modem to permit you know its progress. If information technology fails to register, it reboots and starts from the kickoff. If you continue to feel issues, you'll need to contact your ISP to send out a cable technician to look at your line. It's also possible your modem is faulty and will need to be replaced.

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  • Question

    Should all the lights on modem be solid and vice versa?

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    Community Answer

    They should exist blinking if there is network activity and they should not blink if there is no cyberspace action.

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  • While the modem provides you with diagnostic data, there is piffling you can do with it by yourself. Only your internet access provider can re-provision you with a new config file, update your firmware, and fix bespeak issues on the line outside your house. If you understand this information though, it will give more helpful data to the tech who visits your house and get your issue resolved more apace.

  • It may audio counterintuitive, but too high bespeak strength tin can as well be a bad thing. This is more rare, but it happens sometimes. Besides strong of a bespeak tin hitting equipment pretty hard. If your downstream power level is between v - ten dBmV for instance, installing a splitter will help reduce the power level. If it's whatsoever higher than this, at that place's likely an event outside of your business firm which yous'll have to call your ISP's technician to resolve. They may install an attenuator or pad your drib.

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  • It'southward important not to obsess over the fault logs, ability levels, or SNR if y'all are not experiencing whatever bug. They should be used in conjunction with any reported symptoms to aid you get a pic of what'south going on. It's normal for modems to have occasional error messages, higher upstream power levels, etc. simply as information technology's normal for yous to accept an occasional sneeze fifty-fifty though you're non sick.

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Source: https://www.wikihow.com/Diagnose-Cable-Modem-Issues