 Waimea
join:2010-06-30
Toronto, ON | reply to sbrook
Re: [Cable] Modem is not part of the Continuum. Intermittant SB6I noticed that they were T4 timeouts as opposed to the T3s I had. I'm no network specialist but I've been following this thing pretty closely since rogers started mucking about with the bonding. I can't help but suspect that there is some correlation between both, namely that the cmts isn't responding back to the modem and causing the reset in the cable interface.
I'm sure most of you are familiar with these by now but it doesn't hurt to post them again:
T3 ( 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 ( Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received )
Explanation: The cable modem did not received a station maintenance opportunity in which to transmit a Ranging Request (RNG-REQ) message within the T4 timeout period (30 to 35 seconds). The cable modem is resetting its cable interface and restarting the registration process. Typically, this indicates an occasional, temporary loss of service, but if the problem persists, check for possible service outages or maintenance activity on this particular headend system. This error message is DOCSIS event message is R04.0, Ranging Request.
Source: »volpefirm.com/blog/docsis-101/do···iptions/
Both cite Ranging request as the initial source of the issue. for T3, the modem doesn't get a response after multiple tries and then resets; with T4s the modem doesn't even get a chance to send the ranging request.
Both instances could be caused by signal noise or something that prevents the CMTS from talking to the modem. Or Am I reading it wrong?
edit: To Merovingian, I don't think you can have any effect on who shows up from Rogers, lke they say in french tu vas devoir prendre ton mal en patience until you get a good one. altough one of the techs did tell me that you could escalate it after a few tries to get a more senior level tech in there. Can't quite recall what he called it though.
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 sbrookPremium,Mod
join:2001-12-14
Ottawa
kudos:4
 ·TekSavvy Cable
| T3 timeouts are very common during the modem restart process if there's a line problem, since ranging is an integral part of that process.
T4 timeouts occur during operation and result in a modem restart and hence ranging.
IF there were a line issue, even an intermittent one, one would expect with all those T4s causing rebstarts, a T3 timeout would occur during the restart. |
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 TwiztedZeroNine Zero Burp Nine SixPremium
join:2011-03-31
Toronto, ON
kudos:3
·TekSavvy Cable
| Lots of line noise is my wild guess of the day. Starts around 8am sometimes a little later - and goes on all day long then near to or just after 2am *poof* everything stablizes until the next morning. Ofc thru some of those overnight hours theres the random odd reboot but its steady enough then to stay in irc or do a little streaming. This past weekend its been next to impossible to do that during the daytime hours. Its almost like theres some kind of interference on my line someplace along the way.
Ofc we know most regular people are sleeping and such during the overnight hours so that does indicate its the line someplace.
Its done this ofc three or four times while I typed this short post. Gives you an idea how dismal it is eh?
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You see there is only one constant. One universal. It is the only real truth. Causality. Action, reaction. Cause and effect.
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