I'm paying for the most expensive plan available at my apartment complex (Gigabit). I'm getting ~600 Mbps download (which I'm okay with), and ~5 Mbps upload. The upload speed has become unbearable and, honestly, unacceptable for a top-tier modern internet plan.
For reference, 5 Mbps upload speeds means it takes 40 minutes to upload a 10-minute home video to social media. 5 Mbps means streaming gameplay on something like Twitch is guaranteed to be horrible quality. 5 Mbps means having choppy video calls with family back home. 5 Mbps means my personal file server is painfully slow outside of the local network.
When I called support this morning, after 40 minutes of running identical speed tests and four separate modem restarts, the support agent directed me to call my modem manufacturer Arris. Instead of doing that, I looked into my modem (SB6190) myself and found this:
|Upstream Bonded Channels|
|Channel||Lock Status||US Channel Type||Channel ID||Symbol Rate||Frequency||Power|
|1||Locked||ATDMA||3||5120 kSym/s||23.70 MHz||43.25 dBmV|
|2||Locked||ATDMA||2||5120 kSym/s||30.10 MHz||43.25 dBmV|
|3||Locked||ATDMA||1||5120 kSym/s||36.50 MHz||43.25 dBmV|
Arris' FAQ says that acceptable upstream signal levels should be no less than 45 dBmV:
My modem is reading a power level of 43.25. In this situation the FAQ directs me to ask my service provider to adjust the levels. So here I am, asking. Please, sir, may I have some more upstream bandwidth?
@ComcastMorgan this is extremely similar to another thread you answered: https://forums.xfinity.com/t5/Your-Home-Network/upstream-channel-power-levels-too-low-what-to-do/td-...
The solution there appears to have been a modem swap, but the symptoms were different (outages and packet loss vs. upstream bandwidth). Do you believe a modem swap would help me here as well?
Solved! Go to Solution.
The upstream power is fine. The SB6190 is only a DOCSIS 3.0 capable modem. You will never get gig speeds with it. You need to use a DOCSIS 3.1 capable modem such as one of these;
DOCSIS 3.0 is capable of up to 200 Mbit/s. I'm getting five. Are you SURE a new modem is the solution?
|DOCSIS version||Production date||Maximum downstream capacity||Maximum upstream capacity||Features|
|1.0||1997||40 Mbit/s||10 Mbit/s||Initial release|
|1.1||2001||40 Mbit/s||10 Mbit/s||Added VOIP capabilities, standardized the DOCSIS 1.0 QoS mechanisms|
|2.0||2002||40 Mbit/s||30 Mbit/s||Enhanced upstream data rates|
|3.0||2006||1.2 Gbit/s||200 Mbit/s||Significantly increased downstream/upstream data rates, introduced support for IPv6, introduced channel bonding|
|3.1||2013||10 Gbit/s||1–2 Gbit/s||Significantly increased downstream/upstream data rates, restructured channel specifications|
|4.0||2017||10 Gbit/s||10 Gbit/s||Introduces support for fully symmetrical speeds|
They will not push a gigabit speed tier configuration file to a DOCSIS 3.0 modem. It will default to using a slower speed tier config.
Okay, I'll get a new modem with 3.1 now.
I don't know if I believe you about the active speed tier degredation, though. There are no speed tiers between 300 Mbps and 1000 Mbps, and I've been getting ~600:
|Download Speed Tier||Measured Speed (Peak)||Upload Speed Tier||Measured Speed (Peak)|
|5 Mbps||5.95 Mbps(1)||1 Mbps||1.21 Mbps(1)|
|10 Mbps||11.8 Mbps(1)||1 Mbps||1.21 Mbps(1)|
|10 Mbps||11.8 Mbps(1)||2 Mbps||2.4 Mbps(1)|
|25 Mbps||29.41 Mbps||0.768 Mbps||0.89 Mbps(1)|
|50 Mbps||57.56 Mbps(1)||5 Mbps||5.92 Mbps|
|75 Mbps||83.11 Mbps||10 Mbps||11.89 Mbps|
|100 Mbps||111.07 Mbps||5 Mbps||5.92 Mbps|
|150 Mbps||151.65 Mbps(1)||20 Mbps||23.73 Mbps(1)|
|200 Mbps||221.07 Mbps(1)||10 Mbps||11.89 Mbps(1)|
|250 Mbps||265.1 Mbps(1)||25 Mbps||29.7 Mbps(1)|
|300 Mbps||318.2 Mbps(1)||25 Mbps||29.7 Mbps(1)|
|1 Gbps(2)||931.51 Mbps(1)(3)||35 Mbps(2)||38.25 Mbps(1)|
|2 Gbps||2,086 Mbps(1)||2 Gbps||2,060 Mbps(1)|
|(1)Based on independent measurements by Comcast||(2)Available in most, but not all, markets|
|(3)Due to current technological limitations related to the capabilities of Ethernet ports in current hardware, download speeds through those ports for 1 Gbps service are limited as specified in the table above.|
I suppose they could be putting me on an unlisted "tier". At the very least a new modem will improve my download speeds, I see that now. But my biggest concern remains the upload speed. I'm cautiously hopeful those will improve too.
I don't know if I believe you about the active speed tier degredation, though.
Believe what you will.....
You were right, my modem was the issue. I went to Microcenter and picked up a DOCSIS 3.1 modem (the motorola one you sent).
The support person should have seen this incompatability, and I resent the fact that I spent 40 minutes on the phone accomplishing nothing this morning, but I'm glad to have the problem resolved. I'll be sure to come to the forums first in the future.
I'm getting 40 Mbps up right now, which is better than what Comcast "advertises" in that table above.
Thank you for your help! I really appreciate it.
How 'bout that ! Happy surfing !!