Cable Modem Error Logs
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FACEBOOK GET UPDATES BY EMAIL Enter your email below to get exclusive linksys cable modem firmware access to our best articles and tips before everybody else. RSS ALL ARTICLES FEATURES ONLY TRIVIA toshiba cable modem firmware Search How-To Geek How to Read Your Cable Modem's Diagnostic Page When Something Goes Wrong Although unknown to and ignored by most people, cable modems have a diagnostic that can
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help you troubleshoot connection problems. What Diagnostic Page? Unbeknownst to most people, cable modems (and other broadband modems) have diagnostic and logging functions built in, just like routers. While some people do occasionally peek at the control panel of their router, very few people ever look at their modems-or even realize they can do so. RELATED ARTICLEHow to Troubleshoot Your
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Internet Connection, Layer-By-Layer So why look at the diagnostic page and logs of your cable modem in the first place? Think of this familiar scene: something weird is going on with your internet access, so you dutifully unplug your modem and router, start them back up, and things work well again…for a spell. Or maybe your internet connectivity drops out intermittently and no amount of tinkering with your router has solved your problems. While we all tend to over-focus on the router as the source of potential problems, oftentimes the modem (or the line it's connected to) can be at fault. In those cases, you need to peek into the modem to see what's going on. By accessing the tiny little web server hidden inside your modem and reading the diagnostic pages, you can learn a ton of things about your modem and connection like general status, signal strength, and event history via the system log. Armed with that information you can then say something like "Okay, it's not the modem or a signal strength issue
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Inc. OverviewBlogDOCSIS Basics TutorialDOCSIS 3.0 Tutorial SeriesServicesDOCSIS CMTS Expert Support and ServicePNMDOCSIS Security & Capacity PlanningOn Site System AuditRemote System AuditProduct DevelopmentBroadband ImplementationMATLAB Design ServicesMATLAB DOCSIS Bonded Upstream Impairment SimulationSeminarsEPONSIP Trunking and VoIPWhite PapersDigital Library DOCSIS 101: T1,T2,T3, & T4 Timeout Descriptions Post 155 of 186‹‹›› 06/24/2011Brady VolpeDOCSIS 10129 comments DOCSIS T1, T2, T3 & T4 Timeouts This is a handy summary of the various T1, T2, T3 and T4 timeout errors you will find in a DOCSIS network. T3 and T4 timeouts are described in much more detail elsewhere in this blog, however this post provides a high level overview of the various timeouts as a reference. Thanks to baranek110 for the tutorial located on Cable-Modem's Blog. T1 Timeout ( No UCD’s received ) Explanation: The cable modem has not received any periodic Upstream Channel Descriptor (UCD) messages from the CMTS within the timeout period. This error message is DOCSIS event message is U01.0, Upstream Channel Descriptor. T2 Timeout ( No Maintenance Broadcasts for Ranging opportunities received ) Explanation: The cable modem did not receive a broadcast maintenance opportunity in which to transmit a Ranging Request (RNG-REQ) within the T2 timeout period (approximately 10 seconds). The cable modem is resetting its cable interface and restarting the registration process. This error message is DOCSIS event message is R01.0, Ranging Request. T3 Timeout ( Ranging Request Retries Exhausted ) Explanation: The cable modem has sent 16 Ranging Request (RNG-REQ) messages without receiving a Ranging Response (RNG-RSP) message in reply from the CMTS. The cable modem is therefore resetting its cable interface and restarting the registration process. This typically is caused by noise on the upstream that causes the loss of MAC-layer messages. Noise could also raise the signal-to-noise ratio (SNR) on the upstream to a point where the cable modem’s power level is insufficient to transmit any messages. If the cable modem cannot raise its upstream transmit power level to a level that allows successful communication within the maximum timeout period, it resets its cable interface and restarts the registration process. This error message is DOCSIS event message is R03.0, Ranging Request. T4 Timeout ( Received Response to Broadcast Maintenance Request, But no Unic