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I subscribed to docsis 3.1 1 month ago in Miami, FL. I have been unable to achieve download speeds above 450 Mbits. COmcast does not know what is going on and has a maintenence ticket open for 3 weeks now. It seems that comcast cannot support a service it offers to clients.
Having similar issues:
Was on prior XFinity eMTA/GW with Blast consistently reliable and speed consistant at 180Mb/sec down, and 12Mb/up. Today finally (after talking to no less tha 12 folks at Comcast got the new ARRIS SB8200 modem installed and operational. However, only one blue light is solid (downstream), and the upstream is green solid light. What is odd is the upstream speed has gone from 12Mb to 41Mb/sec - yet the light indicates the upstream never changed to DOCSIS 3.1 so I don't understand that at all. The problem is actually on the downstream side. I cannot get a speed test past 500. The results of tests tonight have been all over the place:
Test cases: direct connection to CAT6 ports via Cisco Layer 2 switch, static IP, no routing. High end PC. I work in IT and have worked on networks for past 25 years. I have a mini-datacenter in my basement with 100Gb ethernet, 10Gb ethernet, and 1Gb/100Mb ethernet, and have tested the PC I am using up to 1Gb internally and the PC is capable of driving that much data off of the PCIe SSD.
Tests run approximately ever 15-20 minutes (not on the dot though):
Test 1: 554Mb/43Mb (some spikes in the tool to 750ish) - begin around 10:30PM
Test 2: 583Mb/38Mb (some spikes in the tool to high 600's) (about an hour past test 1)
Test 3: 378Mb/43Mb (no spikes apparent)
Test 4: 160Mb/37Mb (no spikes apparent)
Test 5: 69Mb/35Mb (no spikes apparent)
Test 6: 73Mb/38Mb (no spikes apparent)
Test 7: 60Mb/41Mb (no spikes apparent)
Test 8: 65Mb/39Mb (no spikes apparent)
Test 9: 61Mb/44Mb (no spikes apparent)
Test 10: 59Mb/41Mb (no spikes apparent)
Test 11: 183Mb/45Mb (no spikes apparrent) (at 2:00AM)
These tests are all over the place, and Blast never did this. Blast always was within 180-210Mb 100% of the time. The upstream is solid as a rock (despite not having the blue light on for the upstream side).
If anyone has any ideas (especially the Comcast Engineers) on how to fix this and a) get closer to 1Gb, and b) get more consistency in the speed - especially as you can see during the tests, I dropped to around 60Mb for a significant period of time.
Here is the status of the modem:
|21||Locked||QAM256||663000000 Hz||2.9 dBmV||38.7 dB||0||0|
|1||Locked||QAM256||543000000 Hz||3.5 dBmV||39.6 dB||0||0|
|2||Locked||QAM256||549000000 Hz||3.2 dBmV||39.7 dB||0||0|
|3||Locked||QAM256||555000000 Hz||2.9 dBmV||39.4 dB||0||0|
|4||Locked||QAM256||561000000 Hz||2.9 dBmV||39.3 dB||0||0|
|5||Locked||QAM256||567000000 Hz||2.9 dBmV||39.2 dB||0||0|
|6||Locked||QAM256||573000000 Hz||2.8 dBmV||39.2 dB||0||0|
|7||Locked||QAM256||579000000 Hz||3.0 dBmV||39.2 dB||0||0|
|8||Locked||QAM256||585000000 Hz||3.0 dBmV||39.2 dB||0||0|
|9||Locked||QAM256||591000000 Hz||3.0 dBmV||39.1 dB||0||0|
|10||Locked||QAM256||597000000 Hz||3.2 dBmV||39.2 dB||0||0|
|11||Locked||QAM256||603000000 Hz||3.1 dBmV||39.0 dB||0||0|
|12||Locked||QAM256||609000000 Hz||3.1 dBmV||38.9 dB||0||0|
|13||Locked||QAM256||615000000 Hz||3.0 dBmV||38.9 dB||0||0|
|14||Locked||QAM256||621000000 Hz||2.9 dBmV||38.8 dB||0||0|
|15||Locked||QAM256||627000000 Hz||2.8 dBmV||38.8 dB||0||0|
|16||Locked||QAM256||633000000 Hz||2.9 dBmV||38.8 dB||0||0|
|17||Locked||QAM256||639000000 Hz||2.7 dBmV||38.7 dB||0||0|
|18||Locked||QAM256||645000000 Hz||2.6 dBmV||38.6 dB||0||0|
|19||Locked||QAM256||651000000 Hz||2.5 dBmV||38.6 dB||0||0|
|20||Locked||QAM256||657000000 Hz||2.8 dBmV||38.8 dB||0||0|
|22||Locked||QAM256||669000000 Hz||2.9 dBmV||38.6 dB||0||0|
|23||Locked||QAM256||675000000 Hz||2.6 dBmV||38.6 dB||0||0|
|24||Locked||QAM256||681000000 Hz||3.0 dBmV||38.8 dB||0||0|
|159||Locked||Other||702000000 Hz||5.5 dBmV||38.2 dB||74||0|
|Upstream Bonded Channels|
|Channel||Channel ID||Lock Status||US Channel Type||Frequency||Width||Power|
|1||1||Locked||SC-QAM||36500000 Hz||6400000 Hz||37.8 dBmV|
|2||2||Locked||SC-QAM||30100000 Hz||6400000 Hz||38.3 dBmV|
|3||3||Locked||SC-QAM||23700000 Hz||6400000 Hz||37.8 dBmV|
|4||4||Locked||SC-QAM||17300000 Hz||6400000 Hz||38.3 dBmV|