Regular Visitor
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5 Messages
Critical Modem Error: "Started Unicast Maintenance Ranging - No Response received - T3 time-out"
I appear to be having issues with a NETGEAR CM1150V modem (or the upstream wiring). This is my second modem after trying the Xfinity recommended Motorola . I use cable TV, internet, and voice connections. Orbi mesh network for WiFi.
Currently paying for the 1 Gbps package and am receiving a sluggish, high latency ~50 Mbps on average. The Xfinity Status Center displays "We're having trouble finding a signal", my wife's work laptop drops internet frequently (no other devices drop the wifi signal), and the modem has "Started Unicast Maintenance Ranging - No Response received - T3 time-out" errors all over the event logs.
Any advice on what can be done is appreciated. DSLReports indicates no bufferbloat, Orbi connection seems solid. Modem resets from the Xfinity dashboard don't help. I'm left scratching my head here.
Responses
EG
Expert
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87K Messages
6 m ago
Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers. And the error log entries in their entirety.
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navbob
Regular Visitor
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5 Messages
6 m ago
Hey thanks in advance for taking a look. Here are the power levels and SNR numbers:
Status
Profile ID
ID
MER
Number Range
Codewords
Codewords
Codewords
System Up Time:3 days 08:21:45
And here is the event log I captured yesterday:
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EG
Expert
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87K Messages
6 m ago
The up and the down power levels are out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test
If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
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