US Cable Support > Comcast HSI > [Speed] Apartment Complex Slow at Nights?

[Speed] Apartment Complex Slow at Nights?

Very good chance, especially if you have a lot of college kids streaming.

reply to itisme17604
It's possible it's a capacity issue, but you should rule out other problems before you make that assumption.

Please give us more information:

1) Please connect your computer directly to the modem via Ethernet ( no router, no wireless, no USB ) 2) Run ShaperProbe and post your results. (It works with Win 7) 3) Post your upstream and downstream signal levels (click the link.) We are interested in your power levels (dBmV) and your Signal to Noise Ratio (SNR). 4) Let us know to what speed tier you subscribe. 5) Post the make a model of your modem. 6) Post your modem's error logs.

Motorola 6120

ShaperProbe: (DAY TEST)
Connected to server 80.239.168.233.

Estimating capacity:
Upstream: 5367 Kbps.
Downstream: 20776 Kbps.

The measurement will last for about 2.5 minutes. Please wait.

Checking for traffic shapers:

Upstream: Burst size: 4787-4905 KB; Shaping rate: 2128 Kbps.

Downstream: Burst size: 9365-9797 KB; Shaping rate: 8512 Kbps.

For more information, visit: »www.cc.gatech.edu/~partha/diffprobe
logout

Signal Levels:

Downstream Bonding Channel Value
Channel ID 1 2
Frequency 585000000 Hz 579000000 Hz
Signal to Noise Ratio 37 dB 37 dB
Downstream Modulation QAM256 QAM256
Power Level
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
0 dBmV 0 dBmV

Upstream Bonding Channel Value
Channel ID 3
Frequency 21600000 Hz
Ranging Service ID 6571
Symbol Rate 2.560 Msym/sec
Power Level 43 dBmV
Upstream Modulation [3] QPSK
[2] 16QAM

Ranging Status Success

Signal Stats (Codewords) Bonding Channel Value
Channel ID 1 2
Total Unerrored Codewords 17710387396 530517456
Total Correctable Codewords 15 0
Total Uncorrectable Codewords 763 1408

Speed Tier:
8/2

Error Logs:

Only one that shows up is this twice a week or so.

No Ranging Response received - T3 time-out;CM-MAC=e4:83:99:8b:ed:de;CMTS-MAC=00:01:5c:3c:f2:43;CM-QOS=1.1;CM-VER=3.0;

btw it looks like it is a D3 area
ie you have 2 downstream channels

Perhaps one or two more channels need to be added.

reply to itisme17604
I'd be interested to see some traceroutes to some sites (both during the day when speeds are good and to the same sites at night when your speeds are slow). Maybe 2-3 sites and see if there is a noticeable difference from day to night.

reply to DarkLogix
I had thought that D3 areas have upgraded from 8/2 to 12/2 or 16/2 am I correct? That is what happened with my parents place in the Bay Area where they have 4-8 channel downstream.

reply to itisme17604
NIGHT TEST 10:50pm

ShaperProbe
Connected to server 217.163.1.100.

Estimating capacity:
Upstream: 5830 Kbps.
Downstream: 4363 Kbps.

The measurement will last for about 2.5 minutes. Please wait.

Checking for traffic shapers:

Upstream: Burst size: 4450-4587 KB; Shaping rate: 2090 Kbps.

Downstream: Measurement aborted due to high packet loss rate.

Another test resulted:

Connected to server 38.102.0.111.

Estimating capacity:
Upstream: 6951 Kbps.
Downstream: 5007 Kbps.

The measurement will last for about 2.5 minutes. Please wait.

Checking for traffic shapers:

Upstream: Burst size: 4795-4974 KB; Shaping rate: 2128 Kbps.

Downstream: Burst size: 1401-1484 KB; Shaping rate: 2725 Kbps.

Signal Levels
Downstream Bonding Channel Value
Channel ID 1 2
Frequency 585000000 Hz 579000000 Hz
Signal to Noise Ratio 38 dB 37 dB
Downstream Modulation QAM256 QAM256
Power Level
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
0 dBmV 0 dBmV

Upstream Bonding Channel Value
Channel ID 3
Frequency 21600000 Hz
Ranging Service ID 6571
Symbol Rate 2.560 Msym/sec
Power Level 43 dBmV
Upstream Modulation [3] QPSK
[2] 16QAM

Ranging Status Success

Signal Stats (Codewords) Bonding Channel Value
Channel ID 1 2
Total Unerrored Codewords 23884706961 6704836888
Total Correctable Codewords 45 84
Total Uncorrectable Codewords 763 1486

Notes
For the speed tier 8/2, this is kind of unacceptable when the internet slows down this much at night. I can easily get a 20mpbs Powerboost during the day, but at night, on Speedtest.net, I can only get 3-4 mpbs if I'm lucky. One of the ShaperProbe tests said that the packetloss was too high? What does this mean?

Your signal levels are good and consistent. That does indeed look like a capacity issue to me. The only other possibility to my mind would be some upstream noise problems, but then I wouldn't expect to see such a dramatic and consistent drop in download speeds.

reply to nerdburg
Is there anyway Comcast can fix this capacity issue? Anything I can do on my end?

There's nothing you can do besides get a tech out to verify if it's a noise problem or not. If it's capacity related there are multiple things they can do to address the issue depending on the current setup. Capacity can be relieved by adding more QAMs (which is unlikely), a node or transmitter split which is more likely the solution.

I wasn't asking you...

reply to itisme17604
You need to rephrase that or at least check and see if its just a speed test result id different or does it slow down whatever it may be that your doing at night because I get different test results but that don't mean crap because for what I do I still have 3 times as much bandwidth as my application requires.People come on here and claim this and that because these speed test actually were designed to market service providers because if u notice their is many ads for service providers on the test sites because they know your bandwidth will fluctuate on and off peak and that will happen no matter what or where.My question is to you" Does your connection not have enough bandwidth at night but does during the day to run your applications'? that don't mean that you got a result from a test and now its in your head that you can't even transfer a photo over the internet now lol.Your not the only person on the internet I am afraid so your going to have traffic that will slow down your RTT which can affect things like gaming etc but what you have a complaint about is bandwidth which is volume per second basically not a RTT which is how fast is can send a file somewhere and get a response and that will slow down on peak which is around 6PM to maybe 1AM .

reply to itisme17604
If you have a D2 modem and screw the tier your on listen to me carefully it is better to have a D3 modem for all service because you have 4 channels to pull from instead of one in most cases and u being in Cali your area probably has D3 which would give you 4 channels anyway.I have actually seen on here where somebody who claimed to know something would give advise to somebody that since they were on a lower tier they just needed a D2 modem and I guess they nor the other person was smart enough to say just spend 30 more dollars and have to latest and greatest instead of buying old technology lol.Yeah technically u don't need a D3 but ummmmm which one is more efficient and up to date ahhhhhhhh where did he go george? lol somebody hold my sign. That was for the person or people and they know who they are who give advise and send people after something they won't be happy with 1 year from now because they only know how to get by instead of putting a lot of thought and planning together to invest their money wisely even if it means investing a little more to save in the long run instead of buying as cheap as u can because its bare minimum and at its end of life so great advise is buy one cheap one then have to buy another one which would exceed the price of the one good one

Again, I have a D3 modem already. The night time slowdowns happen every night and its just not only the bandwidth that slows down, it's also sometimes connecting to sites, packet loss, and pinging servers take 200ms rather than 30ms for example.

I guess the only thing I can do is call comcast and complain?