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Forum Discussion
CM700: Frequent T3/T4 Timeouts
My internet drops a couple of times each day. The outage will range from 2-3 minutes to over 10. This started earlier this year. No changes have been made to the household wiring prior to the problem. The outage does not affect my local network. All devices on the network are visible and communicate. The only issue is that there is no internet coming through the modem.
When I look at the cable modem event log I see frequent T3 and T4 timeout critical events:
Power levels upstream and downstream appear ok:
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1 Reply
Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.
Power levels are ok.
Correctables and un-correctables should be zeros.
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box.
Be sure your using good quality RG6 coax cable up to the modem.
Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
https://highspeed.tips/docsis-events/
