Hub 5 Downstream Channel check please.

[Adduxi]

Hi,

Can any of the lovely Mods please run a check on the line serving my Hub 5, thanks.  About 50% of the channels have a very excessive number of PreRS errors which continually build up to 1000's of millions.  I have power cycled the Hub, and run it with and without the attenuator.  This only started about a week ago. The stats below are just after a reboot. Cheers.

3.0 Downstream channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1	331000000	0.4	41	QAM 256	25
2	139000000	2.4	39	QAM 256	1
3	147000000	2.2	39	QAM 256	2
4	155000000	2.1	39	QAM 256	3
5	163000000	1.9	39	QAM 256	4
6	171000000	1.8	39	QAM 256	5
7	179000000	1.7	39	QAM 256	6
8	187000000	1.5	39	QAM 256	7
9	195000000	1.6	39	QAM 256	8
10	203000000	1.3	39	QAM 256	9
11	211000000	1.4	39	QAM 256	10
12	219000000	1.1	39	QAM 256	11
13	227000000	0.8	39	QAM 256	12
14	235000000	0.5	39	QAM 256	13
15	243000000	0.2	39	QAM 256	14
16	251000000	0.1	39	QAM 256	15
17	259000000	0	39	QAM 256	16
18	267000000	0.4	40	QAM 256	17
19	275000000	0.5	40	QAM 256	18
20	283000000	0.6	40	QAM 256	19
21	291000000	0.7	40	QAM 256	20
22	299000000	0.6	40	QAM 256	21
23	307000000	0.6	40	QAM 256	22
24	315000000	0.4	41	QAM 256	23
25	323000000	0.4	41	QAM 256	24
26	339000000	0.7	41	QAM 256	26
27	347000000	0.7	41	QAM 256	27
28	355000000	0.6	41	QAM 256	28
29	363000000	0.7	41	QAM 256	29
30	371000000	0.9	41	QAM 256	30
31	379000000	1.1	41	QAM 256	31

3.0 Downstream channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1	Locked	41	0	0
2	Locked	39	5016349	0
3	Locked	39	5584225	0
4	Locked	39	5596153	0
5	Locked	39	6120627	0
6	Locked	39	5543327	0
7	Locked	39	5605992	0
8	Locked	39	6139495	0
9	Locked	39	5528343	0
10	Locked	39	5649266	0
11	Locked	39	6134142	0
12	Locked	39	5621551	0
13	Locked	39	5647820	0
14	Locked	39	6113539	0
15	Locked	39	5571023	0
16	Locked	39	5438758	0
17	Locked	39	4904483	0
18	Locked	40	656873	0
19	Locked	40	0	0
20	Locked	40	0	0
21	Locked	40	0	0
22	Locked	40	0	0
23	Locked	40	0	0
24	Locked	41	0	0
25	Locked	41	0	0
26	Locked	41	0	0
27	Locked	41	0	0
28	Locked	41	0	0
29	Locked	41	0	0
30	Locked	41	0	0
31	Locked	41	0	0

[Client62]

Is this behaviour the new normal since software version : LG-RDK_6.9.35-2302.6    

[Tudor]

Looks like noise ingress to me, some of those channels span the DAB radio frequencies. 

[Tudor]

Another possibility is a bad amp in the street cabinet. Definitely think you need a technician’s visit.

[Adduxi]

@Tudor  Agree.  Nothing has been touched or changed on site.  This anomaly just appeared out of the blue before the firmware change. Most likely something faulty in the cabinet.  Hopefully a simple card change in the cabinet?

[Tom_W1]

Hi @Adduxi thanks for your post here in the Community, we're sorry to hear of your concerns and hope you're well.

We're struggling to run tests on your Hub from here, so please allow me to send you a PM so I can look into this further for you and send a technician if necessary.

Please respond directly when you can!
Many thanks

[Tom_W1]

Hi @Adduxi thanks for your co-operation via PM - we're going back publicly now.

So we've ran checks and there aren't any issues on the line we can identify, at the time of the checks being ran all the channels (including downstream) are within specifications so your services should be running perfectly.

What issues are you having with the service please, is it intermittency or low speeds for example?

Many thanks

[Adduxi]

Hi @Tom_W1 

Yes, the power levels are within limits and the BQM i have is fine.  However if you look at the stats being reported by the Hub, they are odd.  I can't say I've noticed any issues with the circuit, but something is amiss.  These errors have only shown up within the past couple of weeks out of the blue.  There have been no changes to my end at all.  I'm wondering if you say there are no issues on my circuit, maybe the problem is with the Hub 5?  For the many years I had the old white trial Hub 3, I've never seen this before.

Anyway, here are the latest stats from the Hub 5, it's on the latest firmware LG-RDK_6.9.35-2302.6, and the uptime is 3 days.   As you can note, the Downstream PreRS errors on 50% of the channels are reporting huge numbers and the 3.1 Upstream channel also has a large number of T3 errors.  

Please see what you can gather from this information as to whether or not a new Hub or a tech visit would be needed.

Network Log
Time	Priority	Description
09/10/2023 10:26	error	DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
09/10/2023 08:32	critical	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
09/10/2023 08:32	critical	16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
09/10/2023 08:31	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06/10/2023 16:04	notice	REGISTRATION COMPLETE - Waiting for Operational status
06/10/2023 16:04	notice	US profile assignment change. US Chan ID: 12; Previous Profile: 13; New Profile: 11 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06/10/2023 16:04	notice	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06/10/2023 16:04	notice	TLV-11 - unrecognized OID;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06/10/2023 16:04	warning	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06/10/2023 16:04	notice	Honoring MDD; IP provisioning mode = IPv4
06/10/2023 16:04	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06/10/2023 16:04	critical	Cable Modem Reboot because of - HW or Power-On Reset

3.0 Upstream channels
Channel	Frequency (Hz)	Power (dBmV)	Symbol Rate (ksps)	Modulation	Channel ID
0	49600000	46.5	5120	QAM 64	1
1	43100000	46.5	5120	QAM 64	2
2	36600000	46.3	5120	QAM 64	3
3	30100000	46.3	5120	QAM 64	4
4	23600000	46	5120	QAM 64	5
3.0 Upstream channels
Channel	Channel Type	T1 Timeouts	T2 Timeouts	T3 Timeouts	T4 Timeouts
0	ATDMA	0	0	0	0
1	ATDMA	0	0	0	0
2	ATDMA	0	0	0	0
3	ATDMA	0	0	0	0
4	ATDMA	0	0	0	0
3.1 Upstream channels
Channel	Channel Width (MHz)	Power (dBmV)	FFT Type	Modulation
12	10.4	42	2K	QAM 256
3.1 Upstream channels
Channel	Channel Type	Number of Active Subcarriers	First Active Subcarrier (Hz)	T3 Timeouts	T4 Timeouts
12	OFDMA	208	74000000	18	0

[Adduxi]

Part two of post with Downstream information;

3.0 Downstream channels
Channel	Frequency (Hz)	Power (dBmV)	SNR (dB)	Modulation	Channel ID
1	331000000	0.4	41	QAM 256	25
2	139000000	2.4	39	QAM 256	1
3	147000000	2.2	39	QAM 256	2
4	155000000	2.1	39	QAM 256	3
5	163000000	1.9	39	QAM 256	4
6	171000000	1.8	39	QAM 256	5
7	179000000	1.7	39	QAM 256	6
8	187000000	1.6	39	QAM 256	7
9	195000000	1.6	39	QAM 256	8
10	203000000	1.4	39	QAM 256	9
11	211000000	1.4	39	QAM 256	10
12	219000000	1.1	39	QAM 256	11
13	227000000	0.8	39	QAM 256	12
14	235000000	0.5	39	QAM 256	13
15	243000000	0.1	39	QAM 256	14
16	251000000	0.1	39	QAM 256	15
17	259000000	0	39	QAM 256	16
18	267000000	0.4	40	QAM 256	17
19	275000000	0.4	40	QAM 256	18
20	283000000	0.5	41	QAM 256	19
21	291000000	0.6	40	QAM 256	20
22	299000000	0.6	40	QAM 256	21
23	307000000	0.6	41	QAM 256	22
24	315000000	0.4	41	QAM 256	23
25	323000000	0.4	41	QAM 256	24
26	339000000	0.7	40	QAM 256	26
27	347000000	0.7	41	QAM 256	27
28	355000000	0.6	41	QAM 256	28
29	363000000	0.6	41	QAM 256	29
30	371000000	0.9	41	QAM 256	30
31	379000000	1	41	QAM 256	31
3.0 Downstream channels
Channel	Locked Status	RxMER (dB)	Pre RS Errors	Post RS Errors
1	Locked	41	2	0
2	Locked	39	1828915979	0
3	Locked	39	2037050889	0
4	Locked	39	2041258496	0
5	Locked	39	2230686188	0
6	Locked	39	2020282971	0
7	Locked	39	2044129056	0
8	Locked	39	2237231327	0
9	Locked	39	2014024162	0
10	Locked	39	2058478646	0
11	Locked	39	2235475188	0
12	Locked	39	2048814971	0
13	Locked	39	2059156259	0
14	Locked	39	2227333043	0
15	Locked	39	2028496192	0
16	Locked	39	1980700762	0
17	Locked	39	1786264972	0
18	Locked	40	239666276	0
19	Locked	40	0	0
20	Locked	41	0	0
21	Locked	40	1	0
22	Locked	40	4	0
23	Locked	41	4	0
24	Locked	41	2	0
25	Locked	41	3	0
26	Locked	40	2	0
27	Locked	41	1	0
28	Locked	41	1	0
29	Locked	41	6	0
30	Locked	41	2	0
31	Locked	41	1	0

3.1 Downstream channels
Channel	Channel Width (MHz)	FFT Type	Number of Active Subcarriers	Modulation (Active Profile)	First Active Subcarrier (Hz)
33	94	4K	1840	QAM 4096	1108
3.1 Downstream channels
Channel ID	Locked Status	RxMER Data (dB)	PLC Power (dBmV)	Corrected errors (Active Profile)	Uncorrectable errors (Active Profile)
33	Locked	41	-0.9	2505474449	0

[Adduxi]

@Tom_W1   Hub fell over last night at approx 21:30 as  recorded by my BQM.  I had to  do a pinhole reset this morning to get the Hub back up again.   Upon reboot, the huge  amount of PreRS errors have started again on the same 50% of the Downstream channels, and I think there is an issue that needs VM to sort. Can this be picked up please.  If this Hub is going to fail every  5 or 6 days uptime, that's not acceptable.