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MrD2

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Cable modem event log

My cable modem keeps logging this event quite frequently, sometimes every hour, and sometimes every 15 minutes.  It alternates between:

US profile assignment change. US Chan ID: 8; Previous Profile: 10 13; New Profile: 9 13.
US profile assignment change. US Chan ID: 8; Previous Profile: 9 13; New Profile: 10 13.

Whenever the cable modem logs this, it seems to coincide with some packet loss.  Connection looks good as far as I can tell and within spec. I tried restarting the cable modem. Same result. Just wanted to check and see if this is a common issue for a cable modem to continue switching the upstream profile, or if I need to have Cox investigate further:

Thanks!

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WiderMouthOpen

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Could be congestion(to many people online on your node) or a signal issue with the upstream. Probably a issue with the OFDMA channel. Can you post your signal levels? Also, when did the problem start and what changed around then? Was it around the time your upload speed increased?

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MrD2

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I upgraded to a 1 Gig connection late last year. Never looked at the logs until a few days ago.

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I only see ATDMA(QAM). Do you see any data for OFDMA? Also, your downstream levels look high. They should be +10 to -10dB. Are you going through a coax amplifier? If so, I wonder if that is causing the problem. 

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MrD2

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I only see ATDMA. I remember a tech plugging in an AC Adaptor to one of the outlets in one of the rooms and connecting a coax cable to it. Model: YS16F-1500500. Anti-lightning surge voltage: 6KV. It has a warning: Cable TV/Internet Service. Do not Disconnect. This could be an attempt to condition/amplify the signal coming to the coax cables in the house from the outside. What is the better alternative if I want to upgrade to a 2-Gig connection down the road? Rewire the entire house?

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Not the entire house, but the coax between the pole and modem, yes. That is a power supply for a amp. Amps can cause issues with speeds, specailly upload. How is the coax wired in your house? Why do you need a amp? Do you have a lot of TV boxes in the house? If not, I suggest running a coax from the street/pole directly to the modem and get rid of the amp. 

BTW, I am not even sure how you are getting 1Gbps without OFDM or OFDMA. What does a speed test show? I doubt 2Gbps is available in your area without that signal. That is the whole purpose of DOCSIS 3.1. What model modem do you have?

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MrD2

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I found OFDM and OFDMA data:

I have 3 mini cable boxes in use throughout the house. Only one has a splitter (an Antronix CMCDT2109TC-A) connecting to the modem: Netgear CM1200. The modem gives me on average 875.63 Mbps download and 111.42 Mbps upload using an Ethernet connection.

Each room has it own cable connector/wire, but not all connectors are active. Only the ones that are in use are active: I think about 4 or 5. Maybe the coax wiring in the house is not that good. Could a fiber connection for the modem improve things? And leave the coax wires for the cable boxes/TVs? I hope getting a 2-Gig connection does not make things worse.

 

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