CODA-4582 - Open Issues for Investigation

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I've Been Here Awhile
Posts: 2

Re: CODA-4582 - Open Issues for Investigation

Have swapped modem, been on the phone for over 2 hours with no luck. Having issue where only some of my devices can connect to the internet (so far only Apple Products and Smartphones?!?!?) Wired connections have no internet, and neither do Windows laptops. No one seems to have ever heard of this happening. Started out of the blue on Monday, after playing around with switching ethernet cords, got one of the wired devices working, then the tech reset my modem and of course that stopped working again to. Anyone ever experiencing anything like this? I'm at a complete loss and it seems Rogers is too!

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I'm Here A Lot
Posts: 5

Re: CODA-4582 - Open Issues for Investigation

I'm not sure this will help but I had a major disruption in my wireless performance after the upgrade from Windows 10 build 1709 to build 1803. I could still connect but the download speeds dropped to 5 kb/s. It took many hours to download a 100MB file. I tried updating all my network adapter drivers with no improvement. Finally after talking to Microsoft I restored build 1709 and my speeds were back to normal. I still have issues with my service that were there before the W10 update and unfortunately those are still there. 

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I've Been Here Awhile
Posts: 2

Re: CODA-4582 - Open Issues for Investigation

Another fun fact, I can only access google and Facebook pages on the windows devices, the rest time out.
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I Plan to Stick Around
Posts: 43

Re: CODA-4582 - Open Issues for Investigation


@abcdpatel wrote:
Another fun fact, I can only access google and Facebook pages on the windows devices, the rest time out.

Wild guess: DNS problem?  (I don't know the Windows tools to diagnose this.  Perhaps ipconfig is useful.)

 

Try pinging 50.31.169.131.  If that doesn't work, probably your DNS is not the problem.  If that works, try pinging arstechnica.com.  If that doesn't work, your DNS is probably not working.  (I just picked arstechnica.com as a random target.)

 

This seems like it could reasonably be on another thread.  Not that it is wrong for this thread but this one is getting SO long.

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I Plan to Stick Around
Posts: 8

Re: CODA-4582 - Open Issues for Investigation

Anyone want to take a stab at my issue. Been getting 400Mbit maximum for months on my gigabit plan. 

DOCSIS WAN

This menu displays both upstream and downstream signal parameters

DOCSIS Overview
Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 597000000 256QAM 0.300 8 40.366
2 849000000 256QAM -0.800 2 40.366
3 855000000 256QAM -1.100 3 40.366
4 861000000 256QAM -1.400 4 40.946
5 579000000 256QAM 0.200 5 40.946
6 585000000 256QAM 0.200 6 40.946
7 591000000 256QAM 0.200 7 40.946
8 303000000 256QAM -1.900 1 38.983
9 603000000 256QAM 0.700 9 40.366
10 609000000 256QAM 0.800 10 40.366
11 615000000 256QAM 0.900 11 40.946
12 621000000 256QAM 0.800 12 40.946
13 633000000 256QAM 1.100 13 40.946
14 639000000 256QAM 1.200 14 40.946
15 645000000 256QAM 1.000 15 40.946
16 651000000 256QAM 1.100 16 40.946
17 657000000 256QAM 1.400 17 40.946
18 663000000 256QAM 1.300 18 40.946
19 669000000 256QAM 1.400 19 40.366
20 675000000 256QAM 1.800 20 40.946
21 681000000 256QAM 1.800 21 40.946
22 687000000 256QAM 1.800 22 43.377
23 693000000 256QAM 2.200 23 40.946
24 699000000 256QAM 2.100 24 40.366
25 705000000 256QAM 2.100 25 40.946
26 711000000 256QAM 1.700 26 40.946
27 717000000 256QAM 1.600 27 40.946
28 723000000 256QAM 1.000 28 40.366
29 825000000 256QAM 0.100 29 40.946
30 831000000 256QAM -0.300 30 40.366
31 837000000 256QAM -0.800 31 40.366
32 843000000 256QAM -0.900 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 -0.700001
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 23700000 ATDMA - 64QAM 35.750 2 6400000
2 38596000 ATDMA - 64QAM 39.500 3 3200000
3 30596000 ATDMA - 64QAM 36.250 1 6400000
OFDM/OFDMA Overview
Channel Index State lin Digital Att Digital Att BW (sc's*fft) Report Power Report Power1_6 FFT Size
0 DISABLED 0.5000 0.0000 0.0000 -inf -1.0000 4K
1 DISABLED 0.5000 0.0000 0.0000 -inf -1.0000 4K
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Resident Expert
Resident Expert
Posts: 6,986

Re: CODA-4582 - Open Issues for Investigation

@mattmartinolc,

 

1.  Are your speedtest results observed via ethernet or wifi?  You should use the www.speedtest.net Toronto Rogers server as the first choice, Montreal Rogers server as second choice.  The Toronto Rogers server is a 10 Gb/s server, not sure about the Montreal server, but, from Ottawa, they are basically equal except for a lower latency from Montreal.  The Toronto server definitely has the horsepower to run gigabit tests.

 

2.  There isn't anything unusual about your signal levels, at least nothing stands out as being a real issue.  The upstream DOCSIS 3.0 levels are a little higher than normal for a modem that is running DOCSIS 3.1 on the downstream side. Normally we've been seeing somewhere in the 30 to 32 dBmV range, but, yours aren't too far from that and are definitely in spec.  What you could do is call tech support and ask the CSR to run a signal check to determine if the DOCSIS 3.1 OFDM levels are within spec or not.  

 

3.  Have you ever inquired with tech support about the modem provisioning, as in what speeds it's set for, for both downstream and upstream?  That's another question to ask, just in case its been set to the wrong values.

 

4.  There are a subset of customers who are seeing slower than expected downstream rates with this modem.  That is most likely due to some issue with the DOCSIS 3.1 processing by the modem.  I've never received a satisfactory answer as to why that is, so this is a definite possibility.  You might be one of those customers.   

 

5.  Are you running the speedtest on a desktop or laptop? 



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I Plan to Stick Around
Posts: 103

Re: CODA-4582 - Open Issues for Investigation

Same issue here....Previously had speeds around 1 gbps and occasionally higher. Now cannot reach even 400 mbps. Was rolled-back to 34T6 about 5 days ago....which previously was good, but now no different. Did reboot...but still no improvement in speed. Something is definitely awry here..... Rogers took a while to improve the 4582 and finally deliver 1gb speeds for almost a year .....but now, we're back to the same poor results we used to get in the early days of this program.  Common Rogers get back in the game and get this fixed ASAP....you cannot expect us to pay for 1Gb service and deliver naught. Rogers.gif

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I Plan to Stick Around
Posts: 43

Re: CODA-4582 - Open Issues for Investigation


@Datalink wrote:

@mattmartinolc,

 

1.  Are your speedtest results observed via ethernet or wifi?  You should use the www.speedtest.net Toronto Rogers server as the first choice,


As a datapoint, I just tried www.speedtest.net.  I'm not complaining about my service, just testing it.

I pay for 1G down I-don't-remember up.  I got 925.32M down and 32.75M up.  A second run 15 minutes later gets very similar numbers.

 

I'm testing from my desktop running FireFox on Fedora Linux 28.  My desktop is wired to my router.  My router is a little PC, a Zotac Zbox RI323 with a Celeron 2961Y processor.  OS: CentOS 7.  NAT is enabled.  The CODA-4582 modem is in bridge mode.

 

So: this router seems to be faster than using an ordinary consumer router.  I have no idea if it is pegged.

 

PS: the speedtest no longer needs flash.  Yay!

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Posts: 6,986

Re: CODA-4582 - Open Issues for Investigation

The Celeron 2961Y is probably as low as you want to go for Gigabit service.  That processor runs at 1.1 Ghz.  Depending on what functions you have enabled for CentOS 7 to run as a router, something in the order of a 2 Ghz or above processor would probably be preferable.  Just depends on the router functions.  The best that you'll see on a speedtest is somewhere around 950 to 960 Mb/s on the download side and 33 Mb/s on the upload side.  Too bad Rogers cut the upload rates down from 50 Mb/s.  They're going to have to do much better to close the gap with Bell's symmetrical download/upload rates over fibre.  



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I Plan to Stick Around
Posts: 43

Re: CODA-4582 - Open Issues for Investigation


@Datalink wrote:

The Celeron 2961Y is probably as low as you want to go for Gigabit service.  That processor runs at 1.1 Ghz.  Depending on what functions you have enabled for CentOS 7 to run as a router, something in the order of a 2 Ghz or above processor would probably be preferable.  Just depends on the router functions.  The best that you'll see on a speedtest is somewhere around 950 to 960 Mb/s on the download side and 33 Mb/s on the upload side.  Too bad Rogers cut the upload rates down from 50 Mb/s.  They're going to have to do much better to close the gap with Bell's symmetrical download/upload rates over fibre.  


The Celeron 2961y is a Haswell processor -- much better instructions/cycle than an Atom-based processor.  It is also dual-core, although I'm not sure how useful that is if most of the processing power is needed to handle a single network stream in the kernel.

 

Too bad that the 2961y does not include the AES-NI instructions to accelerate bulk crypto.  That will matter when I use the router as a VPN gateway.

 

After 50 years of programming, I still don't know how to guess how fast a processor is needed for a task without measuring.  Certainly not within a factor of two.  So my simplistic test was to be a first step.  It looks fast enough for the task.

 

The zbox came with two Realtek ethernet interfaces.  Reputedly that's not ideal.

 

The CentOS installation is a regular desktop one.  With Gnome and all.  It uses the regular iptables firewall mechanism with the expected set of rules (I use firewalld).  Network Manager manages the network.  Summary: a fairly fat install compared with, say, OpenWRT.

 

@Datalinkthanks for all the help to so many Rogers customers.  More than 5k posts!