CODA-4582 - Open Issues for Investigation

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I'm an Advisor
Posts: 1,143

Re: CODA-4582 - Open Issues for Investigation

@huuu wrote:

can someone analyze my coda modem stats here? i only get 450mbps where close to 1gig i have low signals that need a tech to repair or its within specs




Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 591000000 256QAM -3.400 7 35.595
2 561000000 256QAM -1.400 2 36.387
3 567000000 256QAM -2.100 3 36.610
4 573000000 256QAM -1.800 4 36.610
5 579000000 256QAM -2.400 5 36.387
6 585000000 256QAM -2.900 6 36.610
7 555000000 256QAM -1.300 1 36.610
8 597000000 256QAM -3.700 8 35.595
9 603000000 256QAM -3.700 9 35.780
10 609000000 256QAM -5.000 10 35.595
11 615000000 256QAM -4.900 11 35.595
12 621000000 256QAM -4.000 12 35.780
13 633000000 256QAM -3.900 13 36.610
14 639000000 256QAM -4.000 14 36.387
15 645000000 256QAM -4.100 15 36.610
16 651000000 256QAM -4.100 16 36.610
17 657000000 256QAM -4.900 17 35.780
18 663000000 256QAM -5.300 18 35.595
19 669000000 256QAM -5.500 19 35.084
20 675000000 256QAM -5.600 20 35.084
21 681000000 256QAM -5.400 21 35.595
22 687000000 256QAM -5.600 22 35.780
23 693000000 256QAM -5.500 23 35.780
24 699000000 256QAM -5.300 24 35.595
25 705000000 256QAM -5.600 25 35.084
26 711000000 256QAM -6.400 26 35.084
27 717000000 256QAM -6.200 27 34.926
28 723000000 256QAM -7.000 28 33.957
29 825000000 256QAM -6.800 29 35.084
30 831000000 256QAM -7.600 30 34.926
31 837000000 256QAM -6.800 31 35.084
32 843000000 256QAM -6.200 32 35.595
OFDM Downstream Overview
Receiver FFT type Subcarr 0 Frequency(MHz) PLC locked NCP locked MDC1 locked PLC power(dBmv)
1 4K 275600000 YES YES YES -1.099998
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 38595785 ATDMA - 64QAM 38.750 3 3200000
2 30596000 ATDMA - 64QAM 35.000 1 6400000
3 23700000 ATDMA - 64QAM 33.000 2 6400000
Channel Index State lin Digital Att Digital Att BW (sc's*fft) Report Power Report Power1_6 FFT Size
0 DISABLED 0.5000 0.0000 0.0000 -inf -1.0000 4K
1 DISABLED 0.5000 0.0000 0.0000 -inf -1.0000 4K

@huuu SNR levels look very low, call tech support and ask them to check the levels.


I've Been Around
Posts: 1

Re: CODA-4582 - Open Issues for Investigation

Anyone else not able to connect to any DDNS sites? My ip changed, modem failed to update DDNS. Can't seem to connect to any DDNS vendors.

I've Been Here Awhile
Posts: 4

Re: CODA-4582 - Open Issues for Investigation

What is the ideal range for Upstream Signal Strength? I'm currently receiving:

Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 23700000 ATDMA - 64QAM 31.250 2 6400000
2 38596000 ATDMA - 64QAM 35.250 3 3200000
3 30596000 ATDMA - 64QAM 31.250 1 6400000


and I am not having a good time.

Resident Expert
Resident Expert
Posts: 7,243

Re: CODA-4582 - Open Issues for Investigation

@Alance Rogers uses Pre-Equalization on the upstream path, which essentially means that the CMTS is in charge of the modem's upstream power output levels.  The target for the upstream signal arrival at the CMTS is 0 dBmV with a signal to noise ratio minimum of 25 dB, so, the CMTS commands the modem's output levels to move up or down as required to meet the CMTS arrival levels.  My upstream signal levels are similar to yours but from what I can see, we're not suffering from any data rate issues. 


Historically it was typical to see a normal range of 36 to 40 dBmV, but with the 4582, those days are gone.  What you don't want to see are levels in the 51/52 dBmV range which indicates that the modem output power levels are at their maximum for three or four channel operation.  If the power level is still insufficient, the modem will shut down a channel and run the remaining two channels at higher levels.  If that doesn't work, another channel is shut down, leaving one channel in operation.  When you're at the one or two upstream channel stage, you have a cable and/or connector failure in operation and you would really notice slow data rates.

I've Been Here Awhile
Posts: 4

Re: CODA-4582 - Open Issues for Investigation

@Datalink Thank you for your response. I'm still experiencing highly variable jitter and was hoping that there was an easily identifiable cause for it. The search continues...

Resident Expert
Resident Expert
Posts: 7,243

Re: CODA-4582 - Open Issues for Investigation

First thing to do is restart/reboot the modem.  See if that resolves the issue.  After an update, the modem does reboot as part of the update cycle, but, I've found that at a minimum, another restart/reboot is required so that the modem operates as it should.  I usually run a factory reset after each update, up or down.


Just to note, the response time from the modem to the CMTS ramps up significantly in the evening, and, assuming that most residential CMTSs see the same type of ramping up, you will see a base response time around 10 to 12 ms with instantaneous ranges up into the 200 ms range, all variable and unpredictable, ping to ping.  For my neighborhood, I'd say that there has been a major increase in evening response times from last summer.


What you might be seeing is the normal response time from the CMTS due to the CMTS loading.



I Plan to Stick Around
Posts: 19

Re: CODA-4582 - Open Issues for Investigation

yup there is something  going on for sure i am experiencing a fluxating speeds along with degraded performance and Rogers denies there isnt any signal issue.. come on numbers don't lie





I've Been Around
Posts: 1

Re: CODA-4582 - Open Issues for Investigation

Hi there,


I recieved the email a few weeks back to go into a Rogers store to replace the modem. I did last night and now I am unable to make a connection. The @ light is not coming on, I have rebooted the router nearly two dozen times, plugged in different coax cables in different locations in my home and nothing I do seems to be working. I even went back to the store and got another CODA-4582 modem in case the one I recieved was faulty.


I called tech support last night - they informed me a "ticket" would be created and someone would get back to me in 1-3 days. In my experience with Rogers, this usually means nothing is going to be done and I will probably be ignored.


Does anyone have a solution to this?


If Rogers reps read here,  can you confirmed this is actually being looked at?



I am honestly only willing to give this until Friday at most, and then I will be cancelling my internet/TV package and switching ISPs if it is still not resolved.



Edit: Thank god my thread was moved into this one. What a wonderful use of time.

I Plan to Stick Around
Posts: 341

Re: CODA-4582 - Open Issues for Investigation

Got D 3.1 lastnight in North Oshawa.


Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
OFDM Downstream Overview
ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
Upstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth
130596000ATDMA - 64QAM39.75016400000
238596000ATDMA - 64QAM43.00033200000
323700000ATDMA - 64QAM39.75026400000
Channel IndexStatelin Digital AttDigital AttBW (sc's*fft)Report PowerReport Power1_6FFT Size
I've Been Here Awhile
Posts: 2

Re: CODA-4582 - Open Issues for Investigation

Hello All,


Since lot of issues for CODA have been resolved I finally decided to upgrade from 3552, and guess what; I am without internet now for about 24 hours.Smiley Sad


I called in to check what the matter is and it looks like there is some issue with provisioning. I was told yesterday around 2pm that it would take 3 hours max to fix. I still didn’t have service at 8pm and I called back again and they said by morning the issue will be definitely fixed. I wake up to find out still no internet service. I did call support again and was told it may take around 8 more hours!!!Smiley Mad I conformed if they had correct serial on their end.


I understand if service is down for an hour for maintenance, but 24 hours? c'mon it seems like this problem is at lowest priority. I saw some other users having a similar issue and thought it would be better to start a thread. Can anyone please help us get this problem sorted?