Upload speeds are not what they should be

I have the gig plan and for the longest time I have not been getting the proper upload speeds of 35mbps. I typically get close to 21mbps. I used various test servers, and testing programs all with similar results. My download speeds are what I would expect. So I'm wondering why I'm getting slower upload speeds. I tested it with a newer modem, wanted to upgrade anyway... No change. There is a direct connection from where the cable line comes to the house to the room where the modem is so there is no splitters. I have tried a new coax cable (RG6) directly from the front of the house to the modem much closer to that point to see if it's possibly a bad coax line. Again no change. So it seems like the issue is sitting on Comcast's side.

Modem model number is S33v2

Just for reference here is my Upstream Channel Information

Channel ID	Lock Status	US Channel Type	Frequency	Width	Power
1	Not Locked	SC-QAM	16300000 Hz	6400000	34.3 dBmV
2	Not Locked	SC-QAM	22800000 Hz	6400000	37.3 dBmV
3	Not Locked	SC-QAM	29200000 Hz	6400000	32.8 dBmV
4	Locked	SC-QAM	35600000 Hz	6400000	37.0 dBmV

Responses

Z

zandor60657

Contributor

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204 Messages

2 years ago

Not Locked is bad. Those channels won't be used. Something is not working right here. You're cramming all your upload into channel 4. Channel 1 and 3 have a transmit power that's low and out of spec. Minimum is 35dBmV. That said they're not locked so this number could very well be a garbage value. More on that here: https://forums.xfinity.com/conversations/your-home-network/internet-troubleshooting-tips/602dae4ac5375f08cde52ea0

What does your downstream look like? That might help us make a better guess at the problem. Usually I'd ask about WiFi but with 3 of 4 channels not locked it's pretty obvious there's an issue with the line... or you had bad luck and replaced a bad modem with a defective one. It's probably the line or something else on Comcast's end.

Since you've already tried replacing cables and swapping the modem you'll probably need to call a tech out.

2

0

maintenancetech

New Poster

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4 Messages

Yeah that's the way it's been for a while now everything going out only on one upstream channel. Yeah my speed test is being done directly via ethernet. I'm aware of how wifi can be slower than copper in most instances.

Here is my downstream channel list.

1	Locked	QAM256	393000000 Hz	4 dBmV	41 dB	0
2	Locked	QAM256	399000000 Hz	4 dBmV	41 dB	3
3	Locked	QAM256	405000000 Hz	4 dBmV	41 dB	3
4	Locked	QAM256	411000000 Hz	4 dBmV	40 dB	8
5	Locked	QAM256	417000000 Hz	4 dBmV	41 dB	7
6	Locked	QAM256	423000000 Hz	4 dBmV	41 dB	4
7	Locked	QAM256	429000000 Hz	4 dBmV	41 dB	7
8	Locked	QAM256	435000000 Hz	4 dBmV	40 dB	4
9	Locked	QAM256	441000000 Hz	4 dBmV	41 dB	4
10	Locked	QAM256	447000000 Hz	4 dBmV	41 dB	4
11	Locked	QAM256	453000000 Hz	4 dBmV	40 dB	7
12	Locked	QAM256	459000000 Hz	4 dBmV	40 dB	9
13	Locked	QAM256	465000000 Hz	4 dBmV	40 dB	12
14	Locked	QAM256	471000000 Hz	3 dBmV	40 dB	16
15	Locked	QAM256	477000000 Hz	3 dBmV	40 dB	14
16	Locked	QAM256	483000000 Hz	3 dBmV	40 dB	14
17	Locked	QAM256	489000000 Hz	3 dBmV	40 dB	19
18	Locked	QAM256	495000000 Hz	3 dBmV	40 dB	10
19	Locked	QAM256	507000000 Hz	3 dBmV	40 dB	23
20	Locked	QAM256	513000000 Hz	3 dBmV	40 dB	26
21	Locked	QAM256	519000000 Hz	3 dBmV	40 dB	33
22	Locked	QAM256	525000000 Hz	3 dBmV	40 dB	28
23	Locked	QAM256	531000000 Hz	3 dBmV	40 dB	41
24	Locked	QAM256	537000000 Hz	2 dBmV	40 dB	43
25	Locked	QAM256	543000000 Hz	2 dBmV	40 dB	61
26	Locked	QAM256	549000000 Hz	2 dBmV	40 dB	70
27	Locked	QAM256	555000000 Hz	2 dBmV	40 dB	67
28	Locked	QAM256	561000000 Hz	2 dBmV	40 dB	68
29	Locked	QAM256	567000000 Hz	2 dBmV	40 dB	91
30	Locked	QAM256	573000000 Hz	2 dBmV	40 dB	88
31	Locked	QAM256	579000000 Hz	2 dBmV	40 dB	88
33	Locked	OFDM PLC	668000000 Hz	2 dBmV	38 dB	620781168

2 years ago

0

XfinityKrista

Official Employee

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1.5K Messages

Hello @maintenancetech, thank you for taking the time to reach out on social media. I understand your concern with the upload speed, and I'd like the opportunity to check into that for you.

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2 years ago

0

Z

zandor60657

Contributor

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204 Messages

2 years ago

That looks quite fine. All well within spec. Of course your upstream is still a train wreck. I just wanted to see the downstream stats since they give a useful hint as to what your line quality is. Yours looks good, so I'm pretty baffled as to why you're having so much trouble and you have 3 of 4 upstream channels that won't lock. I don't have any suggestions other than calling Comcast and scheduling a tech visit. I think this is a Comcast issue.

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BruceW

Gold Problem Solver

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26.4K Messages

2 years ago

... baffled as to why you're having so much trouble and you have 3 of 4 upstream channels that won't lock ...

Sometimes when the only upstream channel working is the highest frequency one it can mean that Comcast installed a high-pass filter, usually because they believe a customer's equipment is dumping noise on the line. Other possibilities are bad coax cable, bad connections, faulty modem, or problems further upstream toward Comcast.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

0

Your Home Network

maintenancetech

Upload speeds are not what they should be

zandor60657

maintenancetech

XfinityKrista

zandor60657

BruceW

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

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