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Cox → [AZ] Slow download despite high speedtests

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« [VA] Recent increase in packet loss on Cox in Hampton Road, VA • ClearQam is gone in Omaha »
NoOneAtHome
join:2008-07-25
Gilbert, AZ

NoOneAtHome

Member

2015-Oct-25 2:15 pm

[AZ] Slow download despite high speedtests

I recently went through upgrading my modem and working with COX to get the right code on my account for the Ultimate 300. See prev post, »[AZ] Slower than expected Speeds

Since then I am seeing slower actual download transfers than prior to the upgrade. When downloading larger files( typically games) I would see about 25-30 Mbps transfer now I am seeing about 12 Mbps.

I am aslo noticing disparity between various speed tests sites when they used to be about the same. Any ideas?

ASUS RT-AC3200 router behind a ARRIS SB6183 Modem.

Where able I tested from AZ to San Jose





»speedof.me/show.php?img= ··· 6847.png

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel Locked
Connectivity State OK Operational
Boot State OK Operational
Configuration File OK
Security Enabled BPI+
DOCSIS Network Access Enabled Allowed

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Corrected Uncorrectables
1 Locked QAM256 73 813000000 Hz -3.9 dBmV 40.0 dB 0 0
2 Locked QAM256 74 819000000 Hz -3.6 dBmV 40.1 dB 0 0
3 Locked QAM256 75 825000000 Hz -4.0 dBmV 39.9 dB 0 0
4 Locked QAM256 76 831000000 Hz -4.1 dBmV 39.9 dB 0 0
5 Locked QAM256 77 837000000 Hz -4.1 dBmV 39.8 dB 0 0
6 Locked QAM256 78 843000000 Hz -4.4 dBmV 39.3 dB 0 0
7 Locked QAM256 79 849000000 Hz -4.0 dBmV 39.8 dB 0 0
8 Locked QAM256 80 855000000 Hz -4.3 dBmV 39.4 dB 1 0
9 Locked QAM256 89 909000000 Hz -6.1 dBmV 38.5 dB 0 0
10 Locked QAM256 90 915000000 Hz -5.8 dBmV 38.6 dB 1 0
11 Locked QAM256 91 921000000 Hz -6.6 dBmV 38.0 dB 1 0
12 Locked QAM256 92 927000000 Hz -6.9 dBmV 37.8 dB 0 0
13 Locked QAM256 93 933000000 Hz -7.1 dBmV 37.8 dB 2 0
14 Locked QAM256 94 939000000 Hz -7.9 dBmV 37.2 dB 2 0
15 Locked QAM256 95 945000000 Hz -7.8 dBmV 37.3 dB 0 0
16 Locked QAM256 96 951000000 Hz -8.3 dBmV 37.0 dB 2 0

Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 3 5120 Ksym/sec 29800000 Hz 44.3 dBmV
2 Locked TDMA and ATDMA 1 2560 Ksym/sec 18400000 Hz 42.1 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 23300000 Hz 43.0 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 36300000 Hz 45.6 dBmV
· actions · 2015-Oct-25 2:15 pm ·

intel1212
Premium Member
join:2008-01-17
Henderson, NV
·CenturyLink
ARRIS SB8200
Ubiquiti EdgeRouter ER-4
Ubiquiti UniFi AP-PRO

intel1212

Premium Member

2015-Oct-25 3:14 pm

See the recent thread I have started. Same configuration as you.

My symptoms are that everything is okay, but then within hours (typically at least 2 or 3, but sometimes longer), latency beyond the modem goes up on the cox network. I tried another sb6183 -- same. I am now onto a Netgear cm500 modem based on some comments I have seen more than once about this combination. New netgear modem has been on line now ~14 hours. No conclusive results. I replaced a RT-N66u router recently for the RT-AC3200 and did not have these issues.

I suggest watching latency with a looping traceroute and/or pings to router, modem (192.168.100.1) then upstream Cox router, then some place, e.g google.com. Let run over time, and do a Cox speedtest over time too.

Everytime I reboot the modem (sb6183), latency goes down tremendously at first, then creeps up over time.
· actions · 2015-Oct-25 3:14 pm ·

Luke_
Its all in your head
join:2015-08-27
Tempe, AZ

Luke_ to NoOneAtHome

Member

2015-Oct-25 7:33 pm

to NoOneAtHome
What speedtest did you get from Cox's speedtest? »www.cox.com/residential/ ··· 101.html
And also from speedtest.net when testing from the Tempe, AZ server? I noticed your tests on ookla wasn't from Arizona...

Can you do three speed tests each on both these sites hardwired to the modem and post the results?
· actions · 2015-Oct-25 7:33 pm ·
NoOneAtHome
join:2008-07-25
Gilbert, AZ

NoOneAtHome

Member

2015-Oct-25 8:59 pm

Here are the requested speed tests, but as i stated in my post i tested from AZ to San Jose to show the disparity of what my real world downloads looked like prior to the upgrade to what they do now.

»www.speedtest.net/my-res ··· 76434412
»www.speedtest.net/my-res ··· 76437338
»www.speedtest.net/my-res ··· 76439290

results from your cox.com link:
Download Speed: 143348 kbps (17918.5 KB/sec transfer rate)
Upload Speed: 33059 kbps (4132.4 KB/sec transfer rate)
Latency: 29 ms
Jitter: 2 ms
10/25/2015, 5:55:43 PM

Last Result:
Download Speed: 146885 kbps (18360.6 KB/sec transfer rate)
Upload Speed: 33042 kbps (4130.3 KB/sec transfer rate)
Latency: 29 ms
Jitter: 2 ms
10/25/2015, 5:56:48 PM

Last Result:
Download Speed: 177147 kbps (22143.4 KB/sec transfer rate)
Upload Speed: 33521 kbps (4190.1 KB/sec transfer rate)
Latency: 26 ms
Jitter: 2 ms
10/25/2015, 5:58:06 PM
· actions · 2015-Oct-25 8:59 pm ·

Luke_
Its all in your head
join:2015-08-27
Tempe, AZ

Luke_

Member

2015-Oct-25 9:42 pm

 
 
Hmmm thats weird. I live in Tempe, AZ and just did a speedtest using the San Jose, CA server and got way better results than you did using three different servers








Anyone have any thoughts?
· actions · 2015-Oct-25 9:42 pm ·

intel1212
Premium Member
join:2008-01-17
Henderson, NV

intel1212

Premium Member

2015-Oct-25 11:41 pm

Look at my post in past day or so. first, what modem do you have? I think there is something going on with the demodulation of the channels to their Cisco CMTS system. I would suggest people to look over time if they are seeing issues.....
· actions · 2015-Oct-25 11:41 pm ·
NoOneAtHome
join:2008-07-25
Gilbert, AZ

NoOneAtHome

Member

2015-Oct-27 6:24 pm

said by intel1212:

Look at my post in past day or so. first, what modem do you have? I think there is something going on with the demodulation of the channels to their Cisco CMTS system. I would suggest people to look over time if they are seeing issues.....

I have been following your post. I have the SB6183 modem in front of the Asus RT-AC3200. I am interested to see if your change to a different router produces better long term results.
· actions · 2015-Oct-27 6:24 pm ·

intel1212
Premium Member
join:2008-01-17
Henderson, NV
·CenturyLink
ARRIS SB8200
Ubiquiti EdgeRouter ER-4
Ubiquiti UniFi AP-PRO

intel1212

Premium Member

2015-Oct-27 11:59 pm

Yep, you can read that I did change router, now in ~24 hours and problem has gone away. I am totally stumped as to what the problem is. Few forum members have suggested that it might be related to EEE configurations (Energy Efficient Ethernet) setting. I fail to understand how that would or could be the issue. Last suggestion was to put a switch in between the switch and modem -- I can do that but I am not following the logic of how this would impact upstream latency (unless the data from traceroute/ping are wrong somehow). I will try this Friday/weekend. Wife (works from home) needs stability so I have it working (knock on wood) so I will leave it along for awhile.
· actions · 2015-Oct-27 11:59 pm ·
NoOneAtHome
join:2008-07-25
Gilbert, AZ

NoOneAtHome

Member

2015-Oct-28 11:24 am

said by intel1212:

Yep, you can read that I did change router, now in ~24 hours and problem has gone away. I am totally stumped as to what the problem is. Few forum members have suggested that it might be related to EEE configurations (Energy Efficient Ethernet) setting. I fail to understand how that would or could be the issue. Last suggestion was to put a switch in between the switch and modem -- I can do that but I am not following the logic of how this would impact upstream latency (unless the data from traceroute/ping are wrong somehow). I will try this Friday/weekend. Wife (works from home) needs stability so I have it working (knock on wood) so I will leave it along for awhile.

In theory I can understand how it might affect performance if it is flooding the router, but in my case what perplexes is me is that it seems to coincide with COX correcting my code from 150 to 300, my history on testmy.net shows that after Oct 5(when it was properly coded) is when my speeds went to crap. I upgraded to the SB6183 the end of Sept.

»testmy.net/stats/?&t=u&d ··· neAtHome
· actions · 2015-Oct-28 11:24 am ·
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