CODA-4582 - Open Issues for Investigation

[RogersDave]

*** This post was last edited May 2, 2017 ***

Good morning Community,

As I mentioned in a post two days ago, we have received the next firmware 2.0.10.20 from Hitron. We are currently running initial testing on this version and will push it out to participants in the firmware trial program as soon as it passes initial testing.

However, while running these tests, we discovered abnormal behavior with ICMP and are awaiting feedback from Hitron today to asses how this will be addressed. As soon as I this is confirmed, I’ll update the change log with the correct version information and start pushing it out.

In parallel, we are still working on the following high priority items. In some cases below, I requested affected customers to reach out to me via private message. If you do so, please include your modem MAC address in the subject line (even if we exchange messages daily) as there are a lot of you reaching out to me daily 🙂

UDP Packet Loss

The investigation for what has been reported as UDP packet loss is still ongoing. We have deployed a probe at one fellow forum member on both a CODA-4582 and a CGNM-3552 to collect additional data. We are actively working with Hitron and Intel on the results observed.

Based on what we know so far, in most instances UDP packet loss is coupled with higher uplink usage in the area. Although the impact is noticeable in specific logs (League of Legends), the root cause for the perceivable impact (while playing) is likely related to bufferbloat (see next issue).

Bufferbloat

When comparing the performance of a CODA-4582 to a CGNM-3552 in the same network conditions, the CODA-4582 consistently reports higher bufferbloat when tested on DSLReports.

Update April 12: The solution for this problem will come in two folds. It will require a change in software which will possibly be included in 2.0.10.27 but more likely in 2.0.10.28 and a change in network configuration.

The network configuration change is not compatible with the current firmware so this change will only come after a vast majority of the modems are running the new code. We are however looking at a way to make the change only for specific modems to support testing in the community.

Update April 22: This problem seems resolved in firmware 2.0.10.27

5 GHz WiFi Low range for channels 36 to 48

Lower WiFi channels on the modem have a much smaller range. This is due in part to the limit imposed by Industry Canada to maximum transmit power.

Furthermore, the current automatic channel selection (auto mode) tends to select the lower channels when in similar load conditions.

Workaround: manually select higher channels (149-153-157-161)

Update April 22: The channel selection algorithm has been improved in firmware 2.0.10.27

Loss of OFDM Channel Lock

Under some RF conditions, the modem fails to lock properly on the OFDM channel. This typically result in variable performance.

Update April 12: This problem is resolved in 2.0.10.26T2

List of connected device does not get fully populated

This is a known issue that has been tracked since firmware 2.0.10.13. We are making improvements at every firmware but it is not a perfect system.

The situation is worst after a reboot or firmware upgrade as the list gets reset and must be repopulated as devices renew their DHCP lease.

NAT Loopback not working for wired clients

When setting up port forwarding to an internal server, it is possible for a client on WiFi to reach the server using the external IP/port. If the client is on a wired interface, it doesn't work.

Update April 12: This problem is resolved in 2.0.10.26T2 (not confirmed)

LAN Counters not working

Some customers reported that LAN counters (especially in bridge mode) are reporting inaccurate values.

This problem has been reported to Hitron for investigation.

Unexpected modem reboot

Some customers reported their modem reboots unexpectedly. We have also seen this behavior in our lab.

Update April 12: This problem is resolved in 2.0.10.26T2

Missing SC-QAM Channels

After a reboot, some modems are missing SC-QAM channels. A fix has been implemented in 2.0.10.26T2 to address this behavior but it has not corrected all scenarios.

Investigation continues with Hitron.

WiFi Survey

The WiFi Survey functionality in firmware 2.0.10.26T2 (and possibly before) reports incorrect SSID names.

Guest Network

When connecting to the Guest Network, an error message is displayed "only allow DHCP client to use this wireless".  This has been reported in firmware 2.0.10.26T2.

Update April 22: This issue has been resolved in firmware 2.0.10.27

Update May 2: It seems this issue is not fully resolved and still experienced by some users

---

Future Planned Improvements

The following are items that we are working on in parallel of the above.

• Improvement in WiFi speeds
• Improvement in latency / bufferbloat

Dave

*Edited Labels*

[AccordXTC]

Did you know?        I recently learned today from tier 2 when it comes to messuring a customers speeds, this is done by testing a wired and wireless device at the same time. The total speeds on each device added together gets the total amount of what speed of service. So when were testing getting lower speeds there saying it means nothing unless your testing two devices at the same time and giving the total of both.

The their 2 rep was kind enough to point out a "poor marketing" ploy that is in the fine print under the Gigabit package and clicking on Details then How to get your best speeds highlighted in red.

It's a sad day when you hear of shady marketing ploys like that being allowed or even a tier 2 reps advising that.

Any one here been told that or want to add to it?

[joepeps]

Ive never heard that and that makes no sense.

But I did get told by one door knob that anything on wifi 60-150 is great even thought I have gigabit.

Thats the most you need and you will never get more on wifi.

How is this guy allowed to be a tech? lol

[Triple_Helix]

---

@RogersDave wrote:

---

@Triple_Helix wrote:

Only 2 issues I continue to see.

1. Mobile devices keep dropping the 5G Wi-Fi signal

2. Upload speed is not consistent

---

@Triple_Helix, can you clarify what devices do you have that are impacted on 5 GHz?

I just made a small change to your modem for that. Let me know if it helps.

Dave

---

Yes it's my new Moto Z phone and I see that you set the 5G to Auto (Channel) so I will keep an eye for disconnects.

Thanks,

Daniel 

[borford]

---

@AccordXTC wrote:

Did you know?        I recently learned today from tier 2 when it comes to messuring a customers speeds, this is done by testing a wired and wireless device at the same time. The total speeds on each device added together gets the total amount of what speed of service. So when were testing getting lower speeds there saying it means nothing unless your testing two devices at the same time and giving the total of both.

The their 2 rep was kind enough to point out a "poor marketing" ploy that is in the fine print under the Gigabit package and clicking on Details then How to get your best speeds highlighted in red.

It's a sad day when you hear of shady marketing ploys like that being allowed or even a tier 2 reps advising that.

Any one here been told that or want to add to it?

---

Makes perfect sense since most consumer (average) computers with a gig ethernet card can reach download speeds of between 600-900 mbps and a wireless device on the 5G network can reach 70-100 mbps or more if using AC tech. The bandwidth is shared, so simultaneous tests combined would prove the 1 GIG plan.

We are not talking about gaming computers which are optimised for best performance. We are talking about Jane and John Doe and the kids.

Brian

[yyzsam]

I agree except the additional device doesn't have to be wireless. It's always best to test with at least two wired devices that are known to be 1g capable.

[AccordXTC]

@borford funny you sound like the Teir 2 I was talking to backing up the claim. Its deceptive marketing is what it is. I would think my Samsung Galaxy S7 Edge is a Jane and Jonh Doe phone that will do between 400 - 500mbps on WiFi. 

But then again I also run a proper router Asus RT-AC88U than the Hitron CODA 4582. 

I also stated this information for customers such as myself to understand and reply to it. Not another Rogers employee to back up their fellow worker, your paid not to have an opinion. I on the other hand pay a monthly fee and can voice a positive and negtive perspective.

@yyzsam agreed but reread my post the speed test is both devices at the same time to give the total speed, not speed testing each one after another. I can currently get between 600 - 750 wired running full Cat6a and my router mention above. The oringal gigabit modem I was getting between 800-860 always never an issue.

[Alex4161]

@RogersDave and others,

There are 2 issues I have been seeing with the .24 firmware and wanted others to comment if this has happened to them:

1) IP6 connections are being dropped on devices connected via the 5Ghz band.

2) Connectivity is practically dead and looking at my modem stats, it appears that I lose the downstream channels on the OFDM:

OFDM Downstream Overview
Receiver	FFT type	Subcarr 0 Frequency(MHz)	PLC locked	NCP locked	MDC1 locked	PLC power(dBmv)

Power cycling the modem gives the following signal levels and connectivity is restored:

Downstream Overview

Port ID	Frequency (MHz)	Modulation	Signal strength (dBmV)	Channel ID	Signal noise ratio (dB)
1	615000000	256QAM	-2.200	11	36.610
2	561000000	256QAM	-3.200	2	35.780
3	567000000	256QAM	-3.600	3	35.595
4	573000000	256QAM	-2.200	4	35.595
5	579000000	256QAM	-1.200	5	35.780
6	585000000	256QAM	-0.500	6	36.610
7	591000000	256QAM	0.900	7	37.356
8	597000000	256QAM	1.000	8	37.636
9	603000000	256QAM	0.700	9	37.636
10	609000000	256QAM	-0.600	10	36.610
11	555000000	256QAM	-2.400	1	36.387
12	621000000	256QAM	-3.300	12	36.387
13	633000000	256QAM	-2.800	13	36.610
14	639000000	256QAM	-2.100	14	36.387
15	645000000	256QAM	-1.500	15	36.610
16	651000000	256QAM	-2.700	16	36.610
17	657000000	256QAM	-3.200	17	36.610
18	663000000	256QAM	-2.500	18	36.387
19	669000000	256QAM	-2.200	19	36.387
20	675000000	256QAM	-2.200	20	36.610
21	681000000	256QAM	-1.600	21	36.610
22	687000000	256QAM	-1.600	22	36.610
23	693000000	256QAM	-2.400	23	36.610
24	699000000	256QAM	-2.500	24	36.387
25	705000000	256QAM	-3.800	25	36.387
26	711000000	256QAM	-5.100	26	35.780
27	717000000	256QAM	-6.100	27	35.084
28	723000000	256QAM	-7.200	28	34.484
29	825000000	256QAM	-4.800	29	35.780
30	831000000	256QAM	-5.200	30	35.595
31	837000000	256QAM	-5.500	31	35.595
32	843000000	256QAM	-5.700	32	35.780

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	2.400002

Upstream Overview

Port ID	Frequency (MHz)	Modulation	Signal strength (dBmV)	Channel ID	Bandwidth
1	23700000	ATDMA - 64QAM	30.000	2	6400000
2	38595648	ATDMA - 64QAM	35.250	3	3200000
3	30596000	ATDMA - 64QAM	31.250	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

 Has anyone else experienced any of the issues of #1 and #2 and can provide some guidence on how to resolve it?  I am willing to put this router into Bridge mode and purchase a third party router but not sure if that would fix the IP6 issues.  I am pretty sure it won't fix the connection problem and probably cause another bunch of issues with performance (if hardware acceleration is not enabled, etc.)

Thanks

[lethalsniper]

Log on to your router and click on security and click on IPv6 make sure it's on minimum, mine was on custom and was having issues like you on 5G

[4kgigabitguy]

Anyone having degraded WIFI issues (connectivity & loading times, not speed test specific) ? I recently switched from the Rocket AC Modem on Ignite 250u to Gigabit with the CODA modem. It appears load times for websites, apps etc have increased, & stability is not the same, family members are noticing as well....Trying to dig a little deeper into this. 

Downstream Overview
Port ID	Frequency (MHz)	Modulation	Signal strength (dBmV)	Channel ID	Signal noise ratio (dB)
1	615000000	256QAM	-3.500	11	37.636
2	561000000	256QAM	-4.200	2	37.356
3	567000000	256QAM	-4.400	3	37.356
4	573000000	256QAM	-4.100	4	37.636
5	579000000	256QAM	-4.200	5	37.636
6	585000000	256QAM	-3.600	6	38.605
7	591000000	256QAM	-3.700	7	37.356
8	597000000	256QAM	-3.600	8	37.636
9	603000000	256QAM	-3.600	9	37.636
10	609000000	256QAM	-3.800	10	37.356
11	555000000	256QAM	-4.200	1	37.636
12	621000000	256QAM	-3.500	12	37.636
13	633000000	256QAM	-3.100	13	38.605
14	639000000	256QAM	-3.400	14	37.636
15	645000000	256QAM	-3.000	15	37.636
16	651000000	256QAM	-3.300	16	37.636
17	657000000	256QAM	-2.900	17	38.605
18	663000000	256QAM	-3.000	18	37.636
19	669000000	256QAM	-3.800	19	37.636
20	675000000	256QAM	-3.800	20	37.636
21	681000000	256QAM	-4.400	21	37.636
22	687000000	256QAM	-4.100	22	37.356
23	693000000	256QAM	-4.400	23	37.356
24	699000000	256QAM	-4.800	24	37.356
25	705000000	256QAM	-5.000	25	37.636
26	711000000	256QAM	-5.200	26	37.636
27	717000000	256QAM	-5.000	27	37.356
28	723000000	256QAM	-5.100	28	37.356
29	825000000	256QAM	-7.000	29	37.356
30	831000000	256QAM	-7.500	30	37.356
31	837000000	256QAM	-7.400	31	37.356
32	843000000	256QAM	-7.500	32	37.636

pstream Overview
Port ID	Frequency (MHz)	Modulation	Signal strength (dBmV)	Channel ID	Bandwidth
1	38595609	ATDMA - 64QAM	45.750	6	3200000
2	30596000	ATDMA - 64QAM	43.750	4	6400000
3	23700000	ATDMA - 64QAM	42.000	5	6400000

[lethalsniper]

Yea I am and do is a lot of other users I'm thinking of going back to the cgn3acsr

[yyzsam]

@AccordXTC

I meant at the same time too.

[Triple_Helix]

@RogersDave all of a sudden my modem is acting up and looks like I will have to get a replacement tomorrow. Channels 2 to 9 will not come back even after a factory reset and a few reboots. I have one of the first batch of Black Dots that didn't go back for QA checks.

Downstream Overview

Port ID	Frequency (MHz)	Modulation	Signal strength (dBmV)	Channel ID	Signal noise ratio (dB)
1	591000000	256QAM	3.600	7	37.636
10	615000000	256QAM	5.300	11	38.605
11	621000000	256QAM	4.700	12	37.636
12	633000000	256QAM	3.900	13	37.636
13	639000000	256QAM	3.700	14	37.636
14	645000000	256QAM	3.100	15	37.636
15	651000000	256QAM	3.300	16	37.356
16	657000000	256QAM	3.200	17	37.356
17	663000000	256QAM	4.500	18	37.356
18	669000000	256QAM	5.000	19	37.356
19	675000000	256QAM	4.900	20	37.356
20	681000000	256QAM	6.000	21	37.356
21	687000000	256QAM	4.700	22	37.636
22	693000000	256QAM	5.500	23	37.356
23	699000000	256QAM	5.100	24	37.636
24	705000000	256QAM	5.300	25	37.636
25	711000000	256QAM	5.200	26	37.636
26	717000000	256QAM	5.300	27	37.636
27	723000000	256QAM	5.700	28	37.356
28	825000000	256QAM	6.400	29	37.356
29	831000000	256QAM	6.500	30	37.356
30	837000000	256QAM	6.800	31	36.610
31	843000000	256QAM	5.600	32	36.387

OFDM Downstream Overview

Receiver	FFT type	Subcarr 0 Frequency(MHz)	PLC locked	NCP locked	MDC1 locked	PLC power(dBmv)
0	4K	275600000	YES	YES	YES	1.299999
1	NA	NA	NO	NO	NO	NA

Upstream Overview

Port ID	Frequency (MHz)	Modulation	Signal strength (dBmV)	Channel ID	Bandwidth
1	30596000	ATDMA - 64QAM	43.750	1	6400000
2	38596000	ATDMA - 64QAM	45.500	3	3200000
3	23700000	ATDMA - 64QAM	42.500	2	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

[yyzsam]

did you power cycle the modem, aka pull the plug?

[Triple_Helix]

---

@Triple_Helix wrote:

@RogersDave all of a sudden my modem is acting up and looks like I will have to get a replacement tomorrow. Channels 2 to 9 will not come back even after a factory reset and a few reboots. I have one of the first batch of Black Dots that didn't go back for QA checks.

Downstream Overview

Port ID	Frequency (MHz)	Modulation	Signal strength (dBmV)	Channel ID	Signal noise ratio (dB)
1	591000000	256QAM	3.600	7	37.636
10	615000000	256QAM	5.300	11	38.605
11	621000000	256QAM	4.700	12	37.636
12	633000000	256QAM	3.900	13	37.636
13	639000000	256QAM	3.700	14	37.636
14	645000000	256QAM	3.100	15	37.636
15	651000000	256QAM	3.300	16	37.356
16	657000000	256QAM	3.200	17	37.356
17	663000000	256QAM	4.500	18	37.356
18	669000000	256QAM	5.000	19	37.356
19	675000000	256QAM	4.900	20	37.356
20	681000000	256QAM	6.000	21	37.356
21	687000000	256QAM	4.700	22	37.636
22	693000000	256QAM	5.500	23	37.356
23	699000000	256QAM	5.100	24	37.636
24	705000000	256QAM	5.300	25	37.636
25	711000000	256QAM	5.200	26	37.636
26	717000000	256QAM	5.300	27	37.636
27	723000000	256QAM	5.700	28	37.356
28	825000000	256QAM	6.400	29	37.356
29	831000000	256QAM	6.500	30	37.356
30	837000000	256QAM	6.800	31	36.610
31	843000000	256QAM	5.600	32	36.387

OFDM Downstream Overview

Receiver	FFT type	Subcarr 0 Frequency(MHz)	PLC locked	NCP locked	MDC1 locked	PLC power(dBmv)
0	4K	275600000	YES	YES	YES	1.299999
1	NA	NA	NO	NO	NO	NA

Upstream Overview

Port ID	Frequency (MHz)	Modulation	Signal strength (dBmV)	Channel ID	Bandwidth
1	30596000	ATDMA - 64QAM	43.750	1	6400000
2	38596000	ATDMA - 64QAM	45.500	3	3200000
3	23700000	ATDMA - 64QAM	42.500	2	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

---

After a few more reboots (via unplug from the wall) got them all back, man what a hassle.

Downstream Overview

Port ID	Frequency (MHz)	Modulation	Signal strength (dBmV)	Channel ID	Signal noise ratio (dB)
1	591000000	256QAM	3.600	7	37.636
2	567000000	256QAM	4.100	3	38.605
3	573000000	256QAM	3.200	4	38.605
4	579000000	256QAM	3.800	5	38.605
5	585000000	256QAM	3.200	6	38.605
6	561000000	256QAM	3.800	2	38.605
7	597000000	256QAM	3.700	8	37.636
8	603000000	256QAM	4.100	9	38.605
9	609000000	256QAM	5.100	10	38.983
10	615000000	256QAM	5.100	11	38.983
11	621000000	256QAM	4.600	12	37.636
12	633000000	256QAM	3.700	13	37.356
13	639000000	256QAM	3.600	14	37.356
14	645000000	256QAM	3.000	15	37.356
15	651000000	256QAM	3.100	16	37.356
16	657000000	256QAM	3.000	17	37.356
17	663000000	256QAM	4.300	18	37.356
18	669000000	256QAM	4.900	19	37.356
19	675000000	256QAM	4.700	20	37.356
20	681000000	256QAM	5.800	21	37.356
21	687000000	256QAM	4.700	22	37.356
22	693000000	256QAM	5.300	23	37.356
23	699000000	256QAM	4.900	24	37.356
24	705000000	256QAM	5.100	25	37.356
25	711000000	256QAM	5.000	26	37.636
26	717000000	256QAM	5.200	27	37.636
27	723000000	256QAM	5.600	28	37.636
28	825000000	256QAM	6.100	29	36.610
29	831000000	256QAM	6.400	30	37.356
30	837000000	256QAM	6.600	31	36.610
31	843000000	256QAM	5.400	32	36.387
32	555000000	256QAM	3.500	1	38.605

OFDM Downstream Overview

Receiver	FFT type	Subcarr 0 Frequency(MHz)	PLC locked	NCP locked	MDC1 locked	PLC power(dBmv)
0	4K	275600000	YES	YES	YES	1.200001
1	NA	NA	NO	NO	NO	NA

Upstream Overview

Port ID	Frequency (MHz)	Modulation	Signal strength (dBmV)	Channel ID	Bandwidth
1	23700000	ATDMA - 64QAM	42.750	2	6400000
2	38596000	ATDMA - 64QAM	45.250	3	3200000
3	30596000	ATDMA - 64QAM	43.500	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

[Datalink]

@4kgigabitguy can you have a look at the following post and follow the instructions included. 

http://communityforums.rogers.com/t5/forums/forumtopicpage/board-id/Getting_connected/message-id/436...

Hopefully this will give me a little more info on the 5g settings for those users who are seeing problems on the 5g network. 

[jon7]

Just to provide another data point, I'm cascading from the CODA-4582 to an ASUS router (not ideal) whereas with the CGR3 I was in bridge mode, and I notice no performance hit on the CODA-4582 as compared to the CGR3.  When I first installed the CODA-4582, it would drop all connections after about bring up about four to six hours, but the update to .24 firmware fixed all issues for me. YMMV of course.

[Mythen]

@Datalink @RogersDave

The new config file that Dave sent to my modem has fixed my frequent disconnect issue on my 5ghz band.  Also I had to change the channel to 149-161 in order to get much better range.  Thanks Dave.  

Only other issue is around 3 to 5 pm local time I experience very high latency spikes. 

Any thoughts on what I can do here?

Thanks 

Mythen

[Datalink]

@Mythen are you running DOCSIS 3.1 yet?

[Alex4161]

@lethalsniper

I changed the firewall setting and that helped. The issue now is the constant loss of the OFDM Downstream channel rendering my internet connection useless. I have to power cycle the modem every few hours.

[Mythen]

@Datalink

No not on Docsis 3.1 yet

[lethalsniper]

I'm on docs 3.1 and I'm getting more speed degradation now then when I was on 3.0 , from the times 3- 11pm this is ridiculous and when I call tech support they tell me everything is fine on there end , they ping my modem and signal levels are fine so ...... I'm straying to wonder if it's just the coda modem and the docs 3.1 is causing the speed degration from I remember I don't think I was getting this when I was on the cgn3acsmr. I don't know how Rogers can get away from this.evey time I call in they don't know what's going on its rediclous nobody can give me a clear answer this has been going on for a month or 2 @RogersDave @Datalink