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Download/Upload speed is dropping to 10mbps up/down daily

user-v5
I'm Here A Lot

I am on the 500mbps internet service tier.  My internet connection was frequently dropping for 5-10 seconds, about 1-3 times a day. Download/Upload speed was also dropping down to 10mbps across all devices, with high latency.  I replaced the cable modem(CODA -4582 with CODA -4582 v1A and firmware v7.1.1.37), and that took care of the frequent drops. But the issue with speed dropping down to 10mbps and high latency is still happening. Rebooting the modem resolves the issue temporarily, but it always returns.

 

I am running my modem in bridge mode with an wrt3200acm router. I ruled out my router by rebooting the router only(saw the same speed on my devices after reboot), trying to download a file directly on the router via a shell and watching the speed, and plugging in the wan ethernet cable into an old router I had laying around and using that instead(same speed). I have tightened and swapped every cable involved in the chain.

 

My home phone modem is in the same room, so there is a two port splitter(rogers provided Antronix splitter) between the wall and the cable modem. I unfortunately cannot move the cable modem or home phone modem to any other location in the house.

 

I am not sure if it is still a modem issue, or a signal issue.  Can someone confirm? The same thing is happening right now, and this is what I am seeing (updated signal logs after cable modem reboot are in the next post):

 

 

 

DOCSIS WAN

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1663000000QAM2561.0991840.946
2591000000QAM2561.500740.946
3597000000QAM2561.099840.946
4603000000QAM2560.799940.946
5849000000QAM256-0.700238.983
6855000000QAM256-1.900338.983
7861000000QAM256-2.700438.983
8579000000QAM2561.299540.366
9585000000QAM2561.299640.366
10609000000QAM2560.9001040.366
11615000000QAM2560.9001140.366
12621000000QAM2560.7991240.366
13633000000QAM2561.2991340.946
14639000000QAM2560.7001438.983
15645000000QAM2560.5001540.366
16651000000QAM2560.7991640.366
17657000000QAM2560.7001740.366
18279000000QAM256-2.599138.983
19669000000QAM2561.2001940.366
20675000000QAM2561.0992040.366
21681000000QAM2560.7992140.366
22687000000QAM2560.7002240.366
23693000000QAM2560.4002340.946
24699000000QAM2560.7992440.366
25705000000QAM2561.0002540.946
26711000000QAM2560.5002640.946
27717000000QAM2561.0992740.366
28723000000QAM2561.2002840.366
29825000000QAM2561.5002940.366
30831000000QAM2561.2993040.946
31837000000QAM2561.0993140.366
32843000000QAM2560.0993240.366
OFDM Downstream Overview
ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
0NANANONONONA
14K275600000YESYESYES-5.700001
Upstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth
12110000064QAM48.76013200000
23870000064QAM48.77046400000
33230000064QAM48.77036400000
42590000064QAM49.27026400000
50QAM_NONE----1600000
60QAM_NONE----1600000
70QAM_NONE----1600000
80QAM_NONE----1600000
OFDM/OFDMA Overview
Channel IndexStatelin Digital AttDigital AttBW (sc's*fft)Report PowerReport Power1_6FFT Size
0DISABLED0.00000.00000.00000.00000.00002K
1DISABLED0.00000.00000.00000.00000.00002K

 

***Edited Labels***

2 REPLIES 2

Re: Download/Upload speed is dropping to 10mbps up/down daily

user-v5
I'm Here A Lot

Just rebooted the cable modem, and my connection is back to normal with 742.8 mbps download, 22 mbps upload (according to rogers speed test). This is what the signal readings after like after the cable modem(they look the same as before the reboot?):

DOCSIS Logs

The DOCSIS event logs are shown here

 

(Log file removed for privacy reasons. Please edit the CM MAC address before uploading the log file. - RogersMoin)


DOCSIS WAN

 
Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 663000000 QAM256 1.099 18 40.366
2 591000000 QAM256 1.400 7 40.946
3 597000000 QAM256 1.000 8 40.366
4 603000000 QAM256 0.799 9 40.946
5 849000000 QAM256 -0.799 2 38.983
6 855000000 QAM256 -1.900 3 38.983
7 861000000 QAM256 -2.700 4 38.605
8 579000000 QAM256 1.200 5 40.946
9 585000000 QAM256 1.299 6 40.366
10 609000000 QAM256 0.799 10 40.946
11 615000000 QAM256 0.799 11 40.366
12 621000000 QAM256 0.799 12 40.366
13 633000000 QAM256 1.200 13 40.366
14 639000000 QAM256 0.599 14 38.983
15 645000000 QAM256 0.500 15 38.983
16 651000000 QAM256 0.799 16 40.366
17 657000000 QAM256 0.599 17 40.366
18 279000000 QAM256 -2.599 1 38.983
19 669000000 QAM256 1.200 19 40.366
20 675000000 QAM256 1.200 20 40.366
21 681000000 QAM256 0.799 21 40.366
22 687000000 QAM256 0.599 22 40.366
23 693000000 QAM256 0.400 23 40.366
24 699000000 QAM256 0.799 24 40.946
25 705000000 QAM256 1.000 25 40.366
26 711000000 QAM256 0.500 26 40.366
27 717000000 QAM256 1.099 27 40.366
28 723000000 QAM256 1.099 28 40.946
29 825000000 QAM256 1.500 29 40.366
30 831000000 QAM256 1.299 30 40.366
31 837000000 QAM256 1.000 31 40.366
32 843000000 QAM256 0.099 32 40.366
OFDM Downstream Overview
Receiver FFT type Subcarr 0 Frequency(MHz) PLC locked NCP locked MDC1 locked PLC power(dBmv)
0 NA NA NO NO NO NA
1 4K 275600000 YES YES YES -5.700001
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 21100000 64QAM 47.760 1 3200000
2 38700000 64QAM 48.770 4 6400000
3 32300000 64QAM 48.770 3 6400000
4 25900000 64QAM 48.770 2 6400000
5 0 QAM_NONE - --- 1600000
6 0 QAM_NONE - --- 1600000
7 0 QAM_NONE - --- 1600000
8 0 QAM_NONE - --- 1600000
OFDM/OFDMA Overview
Channel Index State lin Digital Att Digital Att BW (sc's*fft) Report Power Report Power1_6 FFT Size
0 DISABLED 0.0000 0.0000 0.0000 0.0000 0.0000 2K
1 DISABLED 0.0000 0.0000 0.0000 0.0000 0.0000 2K

 

 

 
 

 

Re: Download/Upload speed is dropping to 10mbps up/down daily

Bridge_broken
I've Been Around

I'm having this exact same issue. Rogers technical support told me to try new cables but that didn't solve the issue. It's very frustrating..

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