Poor cable modem internet service
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gigabit ISP service via cable
1gig down, 30meg up advertised
Sercomm dm1000 modemWhen service is functioning, get 1.15gig down and 37meg up, 0 packet loss, delay average 6.60ms, delay std. dev. 1.01ms.
Over a period of time measured in many hours to several days, packet loss increases along with both delay parameters.
On occasion download speed plummets to around 20 to 30 meg.
When service becomes unusable, power cycling the modem returns all to normal and then the pattern repeats.
As a work around, a timer has been installed to power cycle the modem (only) off at 0200 then on 1 minute later.
This usually yields 24 hours of good service but not always.
The cable modem has been replaced, but eventually over a couple of months the problem returns.
Is this typical behaviour for high speed cable service? I think not but thought I would ask before raising hell with the service provider.
Your thoughts.
Ted Quade -
Based on the fact that everything seems to correct after a cable modem restart, it could be anything from the cable modem to something going on with the ISP. Things to consider:
The modem could be overheating. Maybe a good idea to put a fan on it even if it isn't the problem. They tend to run a little hot.
An amplifier on your ISPs line outside your house could be failing. This would have to be something the ISP investigates.
When the cable modem was replaced, was it replaced with the same model or a different one? If it was the same model, it maybe worth considering replacing it with a different model as there could be something wrong with that particular model.
Cable tends to be not as reliable as fiber. Active components such as amps, etc tend to fail over time. Unlike a PON fiber network which is passive between the ONT and OLT.
Hope this helps!
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@USSZulu Thanks for your input.
I have just now placed a cooling fan on top of the modem. I'll see how that goes.
Ted
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What model cable modem? https://approvedmodemlist.com/intel-puma-6-modem-list-chipset-defects/
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@chpalmer Modem is Sercomm DM1000. It's on the list.
Ted
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@tedquade said in Poor cable modem internet service:
Sercomm DM1000
Yep. That one is a Puma chipset based on the link I put up for you.
UDP traffic affects them badly.
Find something with a Broadcom chipset.
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@chpalmer Thanks for the pointer. In that narrative there is a note as follows:
"Note: stand-alone routers do not contain Intel Puma chipsets."
This implies to me that a router in bridge mode would be a good alternative.
Your thoughts.
Ted -
@tedquade a stand alone router is not a modem. They are speaking of SOHO type routers with that statement.
Several of the models on the Puma list are in fact "gateway" or modem router combos. It does not matter if they are in bridge mode or not. The issues still exist.
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@tedquade My ISP provides CODA57 modems. I have been unable to determine the chipset. I hope it is a step up from CODA56 which seems to be OK. I'm going to give it a try tomorrow.
Ted
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I hope the CODA57 works out for you! If weird slowdowns keep happening even with it, maybe it's worth checking signal stats in the modem UI or asking your ISP for a line quality check. Sometimes, it's not just the hardware.
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@tedquade Hey! So, how's everything going?
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@LukasInCloud CODA57 is in service. Problem was a 10gig link between an upstream switch and the 6100MAX. The switch is between the cable modem and the 6100MAX. All is good now. Tech at the ISP was instrumental in zeroing in on the problem.
Ted
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@tedquade Oh, great news! Thank you for the update, Ted.
